Manuale d’uso / di manutenzione del prodotto 681XXC del fabbricante Anritsu
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SERIES 681XXC SYNTHESIZED SIGNAL GENERA TOR OPERA TION MANUAL P/N: 10370-10333 REVISION: B PRINTED: APRIL 2001 COPYRIGHT 1999 ANRITSU CO. 490 JARVIS DRIVE MORGAN HILL, CA 95037-2809.
W ARRANTY The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment. Anritsu’ s obligation covers repairing or replacing products which prove to be defective during the warranty period.
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Safety Symbols T o prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Company uses the following symbols to indicate safety-related information. For your own safety , please read the information carefully BEFORE operating the equipment.
Safety-2 681XXC OM There are no operator serviceable components inside. Refer servicing of the instrument to qualified service technicians. T o prevent the risk of electrical shock or damage to precision components, do not remove the equipment covers.
T able of Contents Chapter 1 General Information 1-1 SCOPE OF MANUAL .................1 - 3 1-2 INTRODUCTION ...................1 - 3 1-3 DESCRIPTION ....................1 - 3 1-4 IDENTIFICA TION NUMBER ............1 - 5 1-5 ELECTRONIC MANUAL ........
2-6 PREP ARA TION FOR STORAGE/SHIPMENT . . . 2-13 Preparation for Storage ............. 2-13 Preparation for Shipment ............ 2-13 Chapter 3 Local (Front Panel) Operation 3-1 INTRODUCTION ...................3 - 5 3-2 FRONT P ANEL LA YOUT ........
Frequency Modulation Operating Modes .... 3-74 Providing Frequency Modulation ........ 3-75 Square W ave Modulation Operating Modes . . . 3-77 Providing Square W ave Modulation ....... 3-77 3-13 SYSTEM CONFIGURA TION ............ 3-80 Configuring the Front Panel .
Power Level Accuracy T est Procedure ...... 5-14 Power Level Flatness T est Procedure ...... 5-15 Chapter 6 Operator Maintenance 6-1 INTRODUCTION ...................6 - 3 6-2 ERROR AND W ARNING/ST A TUS MESSAGES. . . 6-3 Self-T est Error Messages ....
Appendix A Rear Panel Connectors A-1 INTRODUCTION ...................A - 1 A-2 REAR P ANEL CONNECTORS ...........A - 1 A-3 CONNECTOR PINOUT DIAGRAMS ..
Table of Contents (Continued).
T able of Contents 1-1 SCOPE OF MANUAL .................1 - 3 1-2 INTRODUCTION ...................1 - 3 1-3 DESCRIPTION ....................1 - 3 1-4 IDENTIFICA TION NUMBER ............1 - 5 1-5 ELECTRONIC MANUAL ...............1 - 5 1-6 RELA TED MANUALS .
Figure 1-1. Series 681XXC Synthesized Signal Generator.
Chapter 1 General Information 1-1 SCOPE OF MANUAL This manual provides general information, installation, and operating information for the Anritsu Series 681XXC Synthesized Signal Gen - erator . (Throughout this manual, the terms 681XXC and signal gen - erator will be used interchangeably to refer to the instrument.
1-4 681XXC OM 681XXC Model Frequency Output Power Output Power w/Step Attenuator Output Power w/Electronic Step Attenuator 681 17C 0.01 – 8.4 GHz +13.0 dBm +1 1.0 dBm +9.0 dBm 68137C 2.0 – 20.0 GHz +13.0 dBm +1 1.0 dBm +3.0 dBm 68147C 0.01 – 20.
1-4 IDENTIFICA TION NUMBER All Anritsu instruments are assigned a unique six-digit ID number , such as “875012”. The ID number is imprinted on a decal that is af - fixed to the rear panel of the unit. Special-order instrument configura - tions also have an additional special serial number tag attached to the rear panel of the unit.
Maintenance Manual The Maintenance Manual supplies service informa - tion for all models in the 681XXC series. The service information includes functional circuit descriptions, block diagrams, performance verification tests, cali - bration procedures, troubleshooting data, and as - sembly and component removal/replacement procedures.
Option 14, Rack Mounting without Chassis Slides . Modifies rack mounting hardware to install unit in a console that has mount - ing shelves. Includes mounting ears and front panel handles. Option 15A, High Power Output . Adds high-power RF compo - nents to the instrument providing increased RF output power in the 2–20 GHz frequency range.
1-9 RECOMMENDED TEST EQUIPMENT T able 1-2 lists the recommended test equipment for performing the Se - ries 681XXC Synthesized Signal Generator operation verification tests in Chapter 5. 1-8 681XXC OM Instrument Critical Specification Recommended Manufacturer/Model Frequency Counter , with Cable Kit and External Mixer Range: 0.
T able of Contents 2-1 INTRODUCTION ...................2 - 3 2-2 INITIAL INSPECTION ................2 - 3 2-3 PREP ARA TION FOR USE ..............2 - 4 Power Requirements ...............2 - 4 Line V oltage Selection ..............2 - 4 Power Connection .
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Chapter 2 Installation 2-1 INTRODUCTION This chapter provides installation instructions for the Series 681XXC Synthesized Signal Generator . It includes information on initial in - spection, preparation for use, storage, and reshipment, and General Purpose Interface Bus (GPIB) setup and interconnections.
2-3 PREP ARA TION FOR USE Preparation for use consists of checking that the rear panel line volt - age selector switch is set for the correct line voltage and connecting the signal generator to the power source.
Standby Operation Whenever the signal generator is not being used it should be left connected to the power source and placed in standby . This keeps the internal timebase frequency reference at operating temperature. On the front panel, press LINE to switch the 681XXC from OPERA TE (green LED on) to ST ANDBY (orange LED on).
W armup T ime From Standby –When placing the 681XXC in op - eration from stand-by , allow 30 minutes warmup to assure stable operation. From a Cold Start (0 ° C) –The signal generator re - quires approximately 120 hours (5 days) of warm up to achieve specified frequency stability with aging.
2-4 GPIB SETUP AND INTERCONNECTION The 681XXC provides automated microwave signal generation via the GPIB. The following paragraphs provide information about interface connections, cable requirements, setting the GPIB operating parame - ters, and selecting the external interface language.
Now press the menu soft-key Config . The System Configuration Menu (below) is displayed. T o go to the Configure GPIB menu from this menu, press the menu soft-key GPIB . The Configure GPIB Menu (below) is displayed. Press the menu soft-key GPIB Address to change the current GPIB address of the signal generator .
Selecting the Line T erminator Data is delimited on the GPIB by either the carriage return (CR) ASCII character or both the carriage re - turn and line feed (CR/LF) ASCII characters. Which character is used depends upon the requirements of the system controller .
2-5 RACK MOUNTING KIT INST ALLA TION The rack mounting kit (Option 1) contains a set of track slides (90 ° tilt capability), mounting ears, and front panel handles for mounting the signal generator in a standard equipment rack. The following proce - dure provides instructions for installing the rack mounting hardware on to the instrument.
Step 4 Remove the inner slide assemblies from the outer slide assemblies. Step 5 Place the left side inner slide assembly onto the instrument case with the handle towards the front of the instrument (Fig - ure 2-3).
Step 10 Place the right side inner slide assembly onto the instrument case with the handle towards the front of the instrument. Step 1 1 Insert two green-headed screws through the holes in the slide assembly behind the handle and into the metric tapped holes in the side of the instrument.
2-6 PREP ARA TION FOR STORAGE/SHIPMENT The following paragraphs give instructions for preparing the 681XXC for storage or shipment. Preparation for Storage Preparing the signal generator for storage c.
2-14 681XXC OM ANRITSU INSTALLATION SERVICE CENTERS UNITED ST A TES ANRITSU COMP ANY 490 Jarvis Drive Morgan Hill, CA 95037-2809 T elephone: (408) 776-8300 1-800-ANRITSU F AX: 408-776-1744 FRANCE ANRITSU S.
T able of Contents 3-1 INTRODUCTION ...................3 - 5 3-2 FRONT P ANEL LA YOUT ...............3 - 6 Line Key ....................3 - 6 Data Display Area ................3 - 6 Data Entry Area .................3 - 7 RF Output Control Key ........
3-7 CW FREQUENCY OPERA TION .......... 3-21 Selecting CW Mode ............... 3-21 Selecting a CW Frequency ........... 3-22 Selecting a Power Level ............. 3-24 CW Ramp ................... 3-25 3-8 SWEEP FREQUENCY OPERA TION ........ 3-26 Analog Sweep Mode .
3-1 1 LEVELING OPERA TIONS ............. 3-60 Selecting a Leveling Mode ........... 3-60 Attenuator Decoupling ............. 3-64 ALC Power Slope ................ 3-65 User Cal (User Level Flatness Correction) . . . 3-67 3-12 SIGNAL MODULA TION ......
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Chapter 3 Local (Fr ont Panel) Operation 3-1 INTRODUCTION This chapter provides information and instructions on operating the Series 681XXC Synthesized Signal Generator using the front panel controls.
3-2 FRONT P ANEL LA YOUT The 681XXC front panel is divided into two main areas—the data dis - play area and the data entry area. The following paragraphs provide a brief description of the front panel controls, inputs, outputs, and data display and data entry areas as shown in Figure 3-1.
Data Entry Area The data entry area consists of data entry keys and controls that provide for (1) changing values for each 681XXC parameter , and (2) terminating the value entry and assigning the appropriate units (GHz, MHz, dBm, etc.). RF Output Control Key The RF output control key provides for turning the RF output power on and off.
3-3 DA T A DISPLA Y AREA The data display area consists of the data display and the surrounding menu keys. The data display is a dot matrix liquid crystal display (LCD) that provides 16 lines of 40 characters each. Information is pre - sented on the LCD in the form of menu displays.
Menu Display Format The menu display is divided into specific areas that show the frequency , power level, and modulation in - formation for the current signal generator setup. Menu labels for the current menu’ s soft-keys appear along the bottom and right side of the display .
most cases, when a menu soft-key is pressed, its menu label changes appearance to visually show the On/Off condition. W indow Display A window display that overlays a portion of the cur - rent menu display is used to (1) show the parameter being edited; (2) display selection lists of preset fre - quencies, power levels, markers, etc.
sweep. In the Level Sweep mode, this menu lets you select the power sweep range parame - ters to use. q MODULA TION —This menu provides you with access to sub-menus that let you select the type of signal modulation (AM, FM, or Square W ave) and control the option settings for each type.
3-4 DA T A ENTRY AREA The value of a selected 681XXC parameter can be changed using the rotary data knob and/or keys of the data entry area. Each element of the data entry area is identified in Figure 3-3 and described in the fol - lowing paragraphs.
Rotary Data Knob The rotary data knob can be used to change the value of a parameter that is open for editing. The cursor is moved under the open parameter using the < and > pads of the cursor control key . Then, by slowly turning the knob clockwise or counter- clockwise the value of the parameter is increased or decreased by the unit size.
3-5 INSTRUMENT ST ART -UP Now that you have familiarized yourself with the layout of the signal generator ’ s front panel controls and data display , you are ready to be - gin operating the instrument.
Self-T esting the 681XXC The 681XXC firmware includes internal diagnostics that self-test the instrument. These self-test diag - nostics perform a brief go/no-go test of most of the PCBs and other internal assemblies. If the signal generator fails self-test, an error message is dis - played on the data display .
3-16 681XXC OM T able 3-1. Reset (Default) Paramenters (1 of 2) 681XXC MODEL NUMBER FREQUENCY P ARAMETERS (GHz) F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 D F 681 17C 3.5 2.0 8.4 2.0 5.0 8.0 8.4 8.4 8.4 8.4 3.5 2.0 8.4 2.0 5.0 8.0 8.4 8.
681XXC OM 3-17 LOCAL (FRONT RESET (DEFAULT) PANEL) OPERATION PARAMETERS T able 3-1. Reset (Default) Paramenters (2 of 2) 681XXC MODEL NUMBER SWEEP TIME STEP SWEEP LEVEL SWEEP LEVEL OFFSET DWELL TIME NUMBER OF STEPS DWELL TIME NUMBER OF STEPS 681 17C 50 ms 1 ms 50 50 ms 50 0.
3-6 ENTERING DA T A Before proceeding to the various modes of signal generator operation, you need to know how to enter data from the front panel. Entering data refers to changing a parameter ’ s value by editing its current value or entering a new value to replace the current value.
Editing the Current V alue T o change the current value of a parameter by edit - ing, you can use either the cursor control key or the rotary data knob. Using the Cursor Control Key Using the < and > pads of the cursor control key , move the cursor under the digit where you want to begin editing.
Entering a New V alue T o change the current value of a parameter by en - tering a new value for the parameter , use the data entry keypad and termination keys. As soon as you press one of the keys on the data en - try keypad, the current parameter display clears for entry of a new value.
3-7 CW FREQUENCY OPERA TION One of the signal generator ’ s major functions is to produce discrete CW frequencies across the frequency range of the instrument. The following paragraphs describe how to place the 681XXC in the CW frequency mode, select a CW frequency and power level for output, and activate the CW ramp.
Selecting a CW Frequency There are several ways to select a CW frequency for output. Y ou can (1) edit the current frequency , (2) enter a new frequency , or (3) select one of the 20 pre - set frequency parameters.
Frequency List –T o go to the Frequency List Menu (below), press Freqs List . This menu lets you tag, edit, or output a frequency from the list. Use the cursor control key to select a frequency from the frequency list. The selected frequency is high - lighted in reverse video and displayed in full below the frequency list.
Scanning T agged Frequencies – T og ot ot h e T agged Frequencies Menu (below) from the CW Fre - quency Control menu, press T ag Freq Menu . This menu lets you select the tagged frequencies for output using the Scan Up and Scan Dn keys. Return to the CW Frequency Control Menu display by pressing Previous Menu .
CW Ramp When active, the signal generator ’s CW ramp pro - vides a repetitive 0V to 10V ramp output to the rear panel HORIZ OUT BNC connector and AUX I/O con - nector . The CW ramp is used to drive a scalar ana - lyzer display . T o go to the CW Ramp Menu (below) from the CW menu, press CW Ramp Menu .
3-8 SWEEP FREQUENCY OPERA TION The signal generator can generate broad (full range) and narrow band sweeps across the frequency range of the instrument. The 681XXC has four sweep frequency modes—analog sweep, step sweep, manual sweep, and list sweep.
This menu lets you perform the following: q Select a sweep range (edit the sweep start and stop frequency parameters). q Go to the sweep ramp menu (set the sweep time and select a sweep trigger). q Select an output power level for the sweep. q Go to the alternate sweep menu.
Selecting a Sweep T rigger There are three modes of sweep triggering provided for analog sweep and step sweep—automatic, exter - nal, and single. The sweep trigger is selectable from the trigger menu.
Step Sweep Mode In step sweep frequency mode, the output frequency changes in discrete, synthesized steps between selected start and stop frequencies. Step sweeps can be from a low frequency to a high frequency or from a high frequency to a low frequency .
The step size range is 1 kHz (0.1 Hz with Option 1 1) to the full frequency range of the signal generator; the number of steps range is 1 to 10,000. If the step size does not divide into the frequency range, the last step is truncated.
Open the parameter you wish to change, then edit the current value using the cursor control key or the rotary data knob or enter a new value using the key pad and appropriate termination key . When you have finished setting the open parameter , close it by pressing its menu soft-key or make another menu selection.
Manual Sweep Mode In manual sweep frequency mode, the output fre - quency can be manually tuned in phase-locked steps between the selected start and stop frequencies us - ing the rotary data knob. As the knob is turned, the current output frequency is displayed on the data display as Fm .
Selecting a Sweep Range Selecting a sweep range involves choosing a start and a stop frequency for the frequency sweep. The sweep range selection process is identical for the analog sweep, step sweep, and manual sweep fre - quency modes.
Selecting a Preset Sweep Range There are four preset sweep range parameters, se - lectable in the analog sweep, step sweep, and man - ual sweep frequency modes. The following is a description of each preset sweep range. q F1-F2 –provides a frequency sweep between the start frequency , F1, and the stop frequency , F2.
Setting a Preset Sweep Range –At the menu, se - lect the sweep range ( F1-F2 , F3-F4 , F5-dF ,o r F6-dF ) that you wish to set. The menu then displays the current frequency parameters for the selected sweep range. Now , use the menu edit soft-keys to open the frequency parameters for editing.
Frequency Markers The signal generator provides up to 20 independent, pre-settable markers, F0-F9 and M0-M9, that can be used in the analog and step sweep frequency modes for precise frequency identification. Marker frequency accuracy is the same as sweep frequency accuracy .
Use the cursor control key to select a frequency parameter from the marker list. The selected fre - quency parameter is highlighted in reverse video and displayed in full below the marker list.
Selecting Alternate Sweep Mode In alternate sweep frequency mode, the signal gen - erator ’ s output frequency sweeps alternately be - tween any two sweep ranges in analog sweep or any two sweep ranges in step sweep. The process of se - lecting and activating the alternate sweep is identi - cal for both analog and step sweep frequency modes.
Now , press Previous Menu to return to the Step Sweep Menu display (or the Analog Sweep Menu display if operating in analog sweep frequency mode). Notice the changes to the Step Sweep Menu display (below). These changes indicate that the alternate sweep frequency mode is active.
When you are done selecting the alternate sweep range, press Previous Menu to return to the Alter - nate Sweep Menu display . Selecting an Alternate Sweep Power Level T o go to the Alternate Level Menu (below) from the Alternate Sweep menu, press Alt Level .
List Sweep Mode In list sweep frequency mode, the output is a step sweep of up to 2000 phase-locked, non-sequential frequencies. Each frequency can have a different power level setting. The list index (0 thru 1999) identifies each frequency/power level set in the list.
Selecting List Sweep Mode T o place the 681XXC in list sweep frequency mode, press the main menu key CW/SWEEP SELECT At the reulting menu display , press List .
Performing List Calculations The PreCalc List soft-key initiates a process that examines every index in the list and performs all the calculations necessary to set the frequency and power levels. The soft-key does not have to be pressed every time the list changes.
List Frequency Edit –to go to the List Frequency Edit Menu (below), press Edit Freq . This menu lets you scroll through the list frequencies and edit se - lected frequencies. The menu displays a total of 20 frequencies. The in - dex range of the displayed frequencies is shown at the top of the list.
Press Edit to edit the highlighted power level or en - ter a new power level. Press Page Up to scroll the displayed power levels to the next 10 in the list. Press Page Down to scroll the displayed power levels to the previous 10 in the list. Press Previous Menu to return to the Edit List Menu display .
Copying Data from the CW Menu An easy method of entering frequency and power level information into the current list index is to copy the data from the CW menu. Fisrt, go to the main List Sweep menu and press the List Index soft-key to open the list index parameter .
Press Start Index to open the list sweep start index parameter . Press Stop Index to open the list sweep stop index parameter . Press Dwell T ime to open the dwell-time-per-step parameter .
T o go to the List Sweep T rigger Menu (below) from the Sweep menu, press T rigger . T o select a sweep trigger mode, press its menu soft- key . A message showing the trigger mode selected appears on the right side of the frequency title bar . When you are finished, press Previous Menu to return to the Sweep Menu display .
3-9 FIXED POWER LEVEL OPERA TION The signal generator provides leveled output power over a maximum range of up to 33 dB (up to 149 dB with Option 2) for CW and sweep frequency operations. Units with Option 15A provide leveled output power over a maximum range of up to 27 dB (up to 141 dB with Op - tion 2).
and appropriate terminator key . T o close the open power level parameter , press Edit L1 or make an - other menu selection. Selecting a Preset Power Level T o select one of the preset power levels for output, press the main menu key LEVEL CONTROL The Level Control menu (below) is displayed.
Use the cursor control key to select a power level from the level list. The selected power level is high - lighted in reverse video and displayed in full below the level list. Press Ta g to mark a selected power level (place an L in front of it). If a power level is already tagged, pressing Ta g will untag it (remove the L ).
Level Offset Level offset lets you compensate for a device on the signal generator ’ s output that alters the RF output power level at the point of interest.
3-10 POWER LEVEL SWEEP OPERA TION The signal generator provides leveled output power sweeps at CW fre - quencies and in conjunction with frequency sweeps (analog and step). Power level sweeps can be from a high level to a low level or vice versa. Power level sweeps can be selected to be linear or logarithmic.
Setting CW Power Sweep Step Size and Dwell T ime There are two ways to set the size of each step of the CW power sweep—set the step size or set the number of steps. The step size range is 0.01 dB (Log) or 0.001 mV (Linear) to the full power range of the instrument; the number of steps range is 1 to 10,000.
Selecting a CW Power Sweep T rigger There are three modes of triggering provided for the CW power sweep—automatic, external, and single. The sweep trigger is selectable from the CW Level Sweep T rigger menu. The following is a description of each trigger mode.
Selecting a Power Level Sweep Range Selecting a power level sweep range consists of choosing a start and stop level for the power level sweep. The power level sweep range selection pro - cess is identical for all power level sweep modes —CW power sweep, analog sweep frequency/step power , and step sweep frequency/step power .
Selecting a Preset Power Level Sweep Range There are five preset power level sweep range pa - rameters selectable in the power level sweep modes. These preset power level sweep range parameters are L1-L2 , L3-L4 , L5-L6 , L7-L8 , and L9-L0 .
Selecting a Sweep Fre - quency/Step Power Mode In analog sweep frequency/step power mode or step sweep frequency/step power mode, a power level step occurs after each frequency sweep. The power level remains constant for the length of time re - quired to complete each frequency sweep.
Setting Power Level Step Size There are two ways to set the step size of the power level step that occurs after each frequency sweep —set the step size or set the number of steps. The step size range is 0.01 dB (Log) or 0.001 mV (Linear) to the full power range of the ssignal generator; the number of steps range is 1 to 10,000.
3-1 1 LEVELING OPERA TIONS The 681XXC generates leveled output power over a maximum range of up to 33 dB (up to 149 dB with Option 2). Instruments with Option 15A provide leveled output power over a maximum range of up to 27 dB (up to 141 dB with Option 2).
The ALC Mode menu lets you perform the following: q Go to the leveling menu (select the ALC mode of operation). q Go to the attenuation menu (decouple the attenuator , if equipped, from the ALC system and set the power level and attenuation). q Select either the front panel or rear panel ex - ternal ALC input.
Before going to the Leveling Menu from the ALC Mode menu, select whether the external ALC signal is to be connected to the front- or rear-panel EXT ALC IN connector . At the ALC Mode menu, press Ext ALC Front to se - lect front panel input, or Ext ALC Rear to select rear panel input.
At the Leveling menu, pressing either Internal or Fixed Gain will turn off external leveling. Press Previous Menu to return to the ALC Mode Menu display . Fixed Gain In the fixed gain mode, the ALC is disabled. The RF Level DAC and step attenuator (if installed) are used to control the relative power level.
Attenuator Decoupling In 681XXCs equipped with option 2 step attenua - tors, the ALC and attenuator work in conjunction to provide leveled output power down to –140 dBm.
ALC Power Slope The ALC power slope function lets you compensate for system, cable, and waveguide variations due to changes in frequency , by linearly increasing or de - creasing power output as the frequency increases.
Press Slope On/Off to activate the ALC power slope function. Press Edit Pivot to open the pivot point frequency parameter for editing. Edit the current frequency using the cursor control key or rotary data knob or enter a new value using the keypad and appropriate termination key .
User Cal (User Level Flatness Correction) The User Cal (user level flatness correction) func - tion lets you calibrate out path variations with frequency that are caused by external switching, amplifiers, couplers, and cables in the test setup. This is done by means of an entered power-offset table from a GPIB power meter or calculated data.
Equipment Setup T o create a power -offset table for user level flatness correction, connect the equipment (shown in Figure 3-4) as follows: Step 1 Using a GPIB cable, connect the Power Meter to the 681XXC. Step 2 Calibrate the Power Meter with the Power Sensor .
At the Configure GPIB menu, press More to go to an Additional Configure GPIB Menu (below). Press Pwr Mtr Address to change the address of the power meter on the GPIB (the power meter ’ s default address is 13).
Place the signal generator in a fixed power level mode by pressing the main menu key LEVEL/ALC SELECT At the resulting menu display , press Level . The 681XXC is now in fixed (non-swept) power level mode. At the Level Menu, press User Cal . The User Level Cal Menu (below) is displayed.
range is 2 to 801.) When you have finished setting the open number-of-points parameter , close it by pressing Edit Points or by making another menu selection. Now , press Start Cal to begin automatically taking power level correction information at each frequency point.
Erasing the Power-Offset T ables from Memory The power-offset tables are stored in non-volatile memory . A master reset is required to erase the con - tents of the tables and reprogram them with default data. T o perform a master reset, proceed as follows: Step 1 W ith the 681XXC in standby , press and hold the RF OUTPUT ON/OFF key .
3-12 SIGNAL MODULA TION The signal generator provides AM, FM, and square wave modulation of the output signal. All modulation modes—AM, FM, and square wave—can be active simultaneously . The following paragraphs provide descriptions and operating instructions for each modulation mode.
q Select the input impedance (600 W or 50 W )o f the input connector . q Select the input connector (front panel or rear panel AM IN ) that is connected to the external signal source. Press O n/O f f to turn AM on and off. Both the AM status display and AM modulation status area will reflect your selection.
In Unlocked W ide mode, frequency modulation is accomplished by applying the modulating signal to the main tuning coil of the YIG-tuned oscillator . Un - locked W ide FM mode allows maximum deviations of ± 100 MHz for DC to 100 Hz rates.
This menu contains an external FM status window that shows the current menu selections and the measured FM Deviation. (The FM deviation meas - urement function measures the voltage of the exter - nal modulation signal and calculates the peak frequency deviation.
Square W ave Modulation Operating Modes The 681XXC provides square wave (pulse) modula - tion of the output signal using modulating signals from either its internal square wave generator or an external signal generator . The signal generator ’ s internal square wave genera - tor outputs modulating signals of 400 Hz, 1 kHz, 7.
Press On/Off to turn square wave modulation on and off. Both the Square W ave status display and the Square W ave modulation status area will reflect your selection.
External Source Input Connector Selection If you have selected External to use a modulating signal from an external source, then when you press More the menu (below) is displayed. Press Front/Rear to select the front or rear panel IN connector . The Square W ave status display shows your selection as Source.
3-13 SYSTEM CONFIGURA TION The system configuration function provides menus that let you set or select instrument configuration items; for example, display intensity , polarity of blanking and video m.
Configuring the Front Panel Configuring the front panel of the signal generator involves adjusting the intensity level of the data dis - play for ease of viewing. T o go to the Configure Front Panel menu from the System Configuration menu, press Front Panel .
Configuring the Rear Panel Configuring the rear panel of the signal generator consists of selecting the polarity of the retrace blanking, bandswitch blanking, retrace penlift, and video marker outputs. T o go to the Configure Rear Panel menu from the System Configuration menu, press Rear Panel .
Configuring the RF Configuring the RF of the 681XXC involves the fol - lowing: q Selecting whether the RF should be on or off during retrace. q Selecting whether the RF should be on or off during frequency switching in CW , step sweep, and list sweep modes.
Additional Configure RF Menu When you press More , the Additional Configure RF Menu (below) is displayed. Press Reset State to select RF On or Off at reset. The display will reflect your selection. Frequency Scaling – Lets you set a reference mul - tiplier value and apply it to all frequency parame- ters.
Configuring the GPIB The GPIB configuration menus let you perform the following: q Set the GPIB address and select the GPIB line terminator for the signal generator . q T urn on the source lock mode for operation with a Model 360B V ector Network Analyzer .
Press SS Mode to place the signal generator in a source lock mode for operation with a Anritsu Model 360B V ector Network Analyzer . (Refer to paragraph 7-4 for information pertaining to operating the 681XXC with a 360B VNA.) Press SS Mode again to turn the source lock mode off.
Press Native SCPI to select the external interface language to be used for remote operation of the 681XXC. (Language selection is only available on instruments that have Option 19 installed.) Press More to go to the Second Additional Config - ure GPIB menu.
Setting Increment Sizes The Increment menu lets you set the incremental size for editing frequency , power level, and time pa - rameters. When the increment mode is selected on, these parameter values.
3-14 SA VING/RECALLING INSTRUMENT SETUPS The 681XXC offers the capability to store up to ten complete front panel setups. The setups are numbered 0 through 9.
Erasing Stored Setups The front panel setups are stored in non-volatile memory . A master reset is required to erase the con - tents of the setups and reprogram them with default data. T o perform a master reset, proceed as follows: Step 1 W ith the 681XXC in standby , press and hold the RF OUTPUT ON/OFF key .
3-15 SECURE OPERA TION The 681XXC can be operated in a secure mode of operation. In this secure mode, the display of all frequency , power level, and modulation parameters is disabled during both local (front panel) and remote (GPIB) operations. The instrument will continue to function normally in all other respects.
3-16 REFERENCE OSCILLA TOR CALIBRA TION The reference oscillator calibration function lets you calibrate the internal 100 MHz crystal reference oscillator of the 681XXC using an external 10 MHz, 0 to +10 dBm reference signal. NOTE Before beginning calibration, always let the 681XXC warm up for a minimum of 120 hours.
When Proceed is pressed, the date parameter opens for data entry . Using the key pad, enter the current date (in any desired format). Then, press any teminator key . The Calibration Status Menu display changes to indicate calibration is in progress. When the reference calibration is complete, the Cali- bration Menu is displayed.
T able of Contents 4-1 INTRODUCTION ...................4 - 3 4-2 MENU MAP DESCRIPTION .............4 - 3 Chapter 4 Local Operation–Menu Maps.
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Chapter 4 Local Operation–Menu Maps 4-1 INTRODUCTION This chapter provides menu maps that support the 681XXC front panel operating instructions found in Chapter 3. It includes menu maps for all of the frequency , power level, and modulation modes of op - eration.
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LOCAL OPERATION SAMPLE –MENU MAPS MENU MAP Figure 4-1. Sample Menu Map (Annotated) 681XXC OM 4-5.
LOCAL OPERATION CW –MENU MAPS FREQUENCY MODE 4-6 681XXC OM Figure 4-2. CW Frequency Mode Menu Map NOTES Refer to Chapter 7, paragraph 7-2 for Master-Slave operating in - structions. Refer to Chapter 3, paragraph 3-7 for CW Frequency Mode operating instructions.
LOCAL OPERATION ANALOG SWEEP –MENU MAPS FREQUENCY MODE 681XXC OM 4-7 Figure 4-3. Analog Sweep Frequency Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-8 for Analog Sweep Frequency Mode operating instructions.
LOCAL OPERATION STEP SWEEP –MENU MAPS FREQUENCY MODE 4-8 681XXC OM Figure 4-4. Step Sweep Frequency Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-8 for Step Sweep Frequency Mode operating instructions.
LOCAL OPERATION MANUAL SWEEP –MENU MAPS FREQUENCY MODE 681XXC OM 4-9 Figure 4-5. Manual Sweep Frequency Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-8 for Manual Sweep Frequency Mode operating instructions.
4-10 681XXC OM LOCAL OPERATION LIST SWEEP –MENU MAPS FREQUENCY MODE Figure 4-6. List Sweep Frequency Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-8 for List Sweep Frequency Mode operating instructions.
LOCAL OPERATION FIXED POWER –MENU MAPS LEVEL MODE Figure 4-7. Fixed Power Level Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-9 for Fixed Power Level Mode operating in - structions.
LOCAL OPERATION CW POWER –MENU MAPS SWEEP MODE Figure 4-8. CW Power Sweep Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-10 for CW Power Sweep Mode operating instructions.
LOCAL OPERATION SWEEP FREQUENCY/ –MENU MAPS STEP POWER MODE Figure 4-9. Sweep Frequency/Step Power Mode Menu Map NOTE Refer to Chapter 3, paragraph 3-10 for Sweep Frequency/Step Power Mode operating instructions.
LOCAL OPERATION LEVELING –MENU MAPS MODES SYSTEM MODULATION CW/SWEEP SELECT FREQUENCY CONTROL LEVEL/ALC SELECT LEVEL CONTROL SYSTEM MODULATION CW/SWEEP SELECT FREQUENCY CONTROL LEVEL/ALC SELECT LEVE.
LOCAL OPERATION AMPLITUDE –MENU MAPS MODULATION MODE SYSTEM CW/SWEEP SELECT FREQUENCY CONTROL LEVEL/ALC SELECT LEVEL CONTROL MODULATION AM On ✱ /Off 600 or 50 Input Impedance Log AM (0-25dB/V) or .
LOCAL OPERATION FREQUENCY –MENU MAPS MODULATION MODE SYSTEM CW/SWEEP SELECT FREQUENCY CONTROL LEVEL/ALC SELECT LEVEL CONTROL MODULATION FM On ✱ /Off 600 or 50 Input Impedance Edit FM Sensitivity F.
LOCAL OPERATION SQUARE WAVE –MENU MAPS MODULATION MODE SYSTEM MO D ULATIO N CW/SW EE P SELEC T FR EQ UE N CY CONT RO L LEVEL/ ALC SELECT LEVE L CONT RO L SYSTEM MO D ULATIO N CW/SW EE P SELEC T FR E.
LOCAL OPERATION SYSTEM –MENU MAPS CONFIGURATION S Y S T E M M O D U L A T I O N C W / S W E E P S E L E C T F R E Q U E N C Y C O N T R O L L E V E L / A L C S E L E C T L E V E L C O N T R O L S e .
T able of Contents 5-1 INTRODUCTION ...................5 - 3 5-2 TEST EQUIPMENT ..................5 - 3 5-3 TEST RECORDS ...................5 - 3 5-4 INITIAL 681XXC CHECKOUT ............5 - 4 Power Up ....................5 - 4 Self T est .............
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Chapter 5 Operation V erification 5-1 INTRODUCTION This chapter contains three operation verification tests that can be used to verify Series 681XXC Synthesized Signal Generator operation. Setup instructions and performance procedures are included for each test.
5-4 INITIAL 681XXC CHECKOUT Before starting the operation verification tests in this chapter , perform an initial checkout of the 681XXC to be tested. This initial checkout consists of applying power to the signal generator , verifying that it passes self-test, and resetting it to the factory default parameters.
5-5 CW FREQUENCY ACCURACY TEST The following test verifies that the CW frequency output of the signal generator is within accuracy specifications. T able 5-2, beginning on page 5-7, contains test records that you can copy and use to record test results for this test.
T est Procedure The following procedure tests both the coarse and fine loops to verify the accuracy of the CW frequency output. Step 1 Set up the 681XXC as follows: a. Reset the instrument by pressing SYSTEM , then RESET . Upon reset, the CW Menu (below) is displayed.
681XXC OM 5-7 Model 68 1__C Serial No. ____________________ Date ___________ 681 17C 68137C / 68147C 1.000 000 000* _____________________ 2.000 000 000* _____________________ 2.000 000 000 _____________________ 5.000 000 000 _____________________ 4.000 000 000 _____________________ 8.
5-8 681XXC OM Model 68 1__C Serial No. ____________________ Date ___________ 68167C 68177C 2.000 000 000* _____________________ 2.000 000 000* _____________________ 5.000 000 000 _____________________ 6.000 000 000 _____________________ 8.000 000 000 _____________________ 10.
681XXC OM 5-9 Model 68 1__C Serial No. ____________________ Date ___________ 68187C 68197C 2.000 000 000* _____________________ 2.000 000 000* _____________________ 6.000 000 000 _____________________ 6.000 000 000 _____________________ 10.000 000 000 _____________________ 10.
5-10 681XXC OM Model 68 1__C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ± 100 Hz. All frequencies are in GHz. 681 17C 68137C / 68147C 1.000 000 000 0* _____________________ 2.000 000 000 0* _____________________ 2.
681XXC OM 5-11 Model 68 1__C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ± 10 Hz. All frequencies are in GHz. 68167C 68177C 2.000 000 000 0* _____________________ 2.000 000 000 0* _____________________ 5.
5-12 681XXC OM Model 68 1__C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ± 10 Hz. All frequencies are in GHz. 68187C 68197C 2,000 000 000 0* _____________________ 2,000 000 000 0* _____________________ 6.
5-6 POWER LEVEL ACCURACY AND FLA TNESS TESTS These tests verify that the power level accuracy and flatness of the 681XXC meet specifications. T able 5-3, beginning on page 5-19, con - tains test records that you can copy and use to record test results for these tests.
Power Level Accuracy T est Procedure Power level accuracy is checked by stepping the power down in 1 dB increments from its maximum rated power level. Step 1 Set up the 681XXC as follows: a. Reset the instrument by pressing SYSTEM , then Reset . The CW Menu (below) is displayed.
Power Level Flatness T est Procedure Power level flatness is checked by measuring the power level variation during a full band sweep; first in the step sweep mode, then in the analog sweep mode. Step 1 Set up the 681XXC as follows for a step sweep power level flatness test: a.
g. Now , return to the Step Sweep menu by pressing the main menu key CW/SWEEP SELECT h. At the Step Sweep menu, press Sweep Ramp to go to the Step Sweep Ramp Menu (below). i. Press Dwell T ime to open the dwell time-per-step parameter for editing. j. Set the dwell time to 1 second.
Step 3 Set up the 681XXC as follows for an ana - log sweep power level flatness test: a. Reset the instrument by pressing SYSTEM , then Reset . The CW Menu is displayed. b. Press Analog to place the 681XXC in the analog sweep frequency mode and display the Analog Sweep Menu.
h. At the Analog Sweep menu, press the menu soft-key Sweep Ramp to go to the Analog Sweep Ramp Menu. i. Press Sweep T ime to open the sweep time parameter for editing. j. Set the sweep time to 99 seconds. NOTE Monitor the 681XXC’ s Horizontal Output on the Oscilloscope to de- termine sweep start and stop.
681XXC OM 5-19 Model 681 17C Serial No. ____________________ Date ___________ Model 681 17C (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
5-20 681XXC OM Model 681 17C Serial No. ____________________ Date ___________ Model 681 17C (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
681XXC OM 5-21 Model 681 17C Serial No. ____________________ Date ___________ Model 681 17C (with Option 2E Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
5-22 681XXC OM Model 681 17C w/Option 15A Serial No. ____________________ Date ___________ Model 681 17C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-23 Model 681 17C w/Option 15A Serial No. ____________________ Date ___________ Model 681 17C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
5-24 681XXC OM Model 681 17C w/Option 15A Serial No. ____________________ Date ___________ Model 681 17C with Option 15A High Power (with Option 2E Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-25 Model 68137C Serial No. ____________________ Date ___________ Model 68137C (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
5-26 681XXC OM Model 68137C Serial No. ____________________ Date ___________ Model 68137C (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-27 Model 68137C Serial No. ____________________ Date ___________ Model 68137C (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
5-28 681XXC OM Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-29 Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
5-30 681XXC OM Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-31 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C Serial No. ____________________ Date ___________ Model 68147C (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
5-32 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C Serial No. ____________________ Date ___________ Model 68147C (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-33 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C Serial No. ____________________ Date ___________ Model 68147C (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
5-34 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
681XXC OM 5-35 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
5-36 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
681XXC OM 5-37 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68167C Serial No. ____________________ Date ___________ Model 68167C (without Option 2B Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
5-38 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68167C Serial No. ____________________ Date ___________ Model 68167C (with Option 2B Step Attenuator) Power Level Accuracy * (CW Frequency = 1.0 GHz) Power Level Accuracy * (CW Frequency = 5.
681XXC OM 5-39 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68167C w/Option 15A Serial No. ____________________ Date ___________ Model 68167C with Option 15A High Power (without Option 2B Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
5-40 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68167C w/Option 15A Serial No. ____________________ Date ___________ Model 68167C with Option 15A High Power (with Option 2B Step Attenuator) Power Level Accuracy * (CW Frequency = 1.
681XXC OM 5-41 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68177C Serial No. ____________________ Date ___________ Model 68177C (without Option 2C Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Power Level Accuracy * (CW Frequency = 25.
5-42 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68177C Serial No. ____________________ Date ___________ Model 68177C (with Option 2C Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Power Level Accuracy * (CW Frequency = 25.
681XXC OM 5-43 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68187C Serial No. ____________________ Date ___________ Model 68187C (without Option 2D Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Power Level Accuracy * (CW Frequency = 25.
5-44 681XXC OM OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68187C Serial No. ____________________ Date ___________ Model 68187C (with Option 2D Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Power Level Accuracy * (CW Frequency = 25.
681XXC OM 5-45/5-46 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Model 68197C Serial No. ____________________ Date ___________ Model 68197C Power Level Accuracy * (CW Frequency = 5.0 GHz) Power Level Accuracy * (CW Frequency = 25.0 GHz) Power Level Accuracy * (CW Frequency = 50.
T able of Contents 6-1 INTRODUCTION ...................6 - 3 6-2 ERROR AND W ARNING/ST A TUS MESSAGES. . . 6-3 Self-T est Error Messages .............6 - 3 Normal Operation Error and W arning/Status Messages ....................6 - 8 6-3 TROUBLESHOOTING .
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Chapter 6 Operator Maintenance 6-1 INTRODUCTION This chapter provides the information necessary for operator mainte - nance of the signal generator . Operator maintenance is limited to troubleshooting and repairs that can be made without removing the instrument covers.
6-4 681XXC OM Self-test error messages normally indicate the failure of an internal component or assembly of the signal generator . There are no operator serviceable components inside. Refer servicing of the instrument to qualified service technicians.
681XXC OM 6-5 Error Message Description/Remarks Error 1 1 1 Fine Loop Osc Failed Indicates one or more of the oscillators within the fine loop is not phase-locked. The 681XXC is still operable but the accuracy and stability of frequency outputs are greatly reduced.
6-6 681XXC OM Error Message Description/Remarks Error 125 8.4 – 20 GHz Unlocked and Unleveled Indicates a failure of the 8.4 to 20 GHz YIG-tuned oscillator . Do Not Attempt to Operate! Refer the instrument to a qualified service techician. Error 126 2 – 8.
681XXC OM 6-7 Error Message Description/Remarks Error 138 SDM Unit or Driver Failed Indicates a failure of the switched doubler module (SDM) or SDM bias regulator cir - cuitry on the A14 PCB. The 681XXC is still operable but it will not produce an RF output in the 20 - 40 GHz frequency range.
Normal Operation Error and W arning/ Status Messages When an abnormal condition is detected during op - eration, the 681XXC displays an error message to indicate that the output is abnormal or that a signal input or data entry is invalid.
681XXC OM 6-9 W arning/Status Message Description OVN COLD This warning message indicates that the 100 MHz Crystal oven (or the 10 MHz Crystal oven if Option 16 is installed) has not reached operating temperature. Normally displayed during a cold start of the signal gen - erator .
6-3 TROUBLESHOOTING T able 6-4 provides procedures for troubleshooting common malfunc - tions encountered during operation of the signal generator . Included are procedures for troubleshooting faults that do not produce error messages, such as, failure to power up and unexpected shutdown.
681XXC OM 6-11 Signal Generator Quits During Operation ( OPERA TE light remains on) T rouble Description: The signal generator operates for some time, then shuts down ( OPERA TE light remains on). After a short period, the signal generator resumes normal operation.
6-12 681XXC OM UNLEVELED is Displayed T rouble Description: This message is displayed to indicate that the RF output is unleveled. Step 1 Check that the output power does not exceed the specified leveled-power rating and that the RF OUTPUT connector is terminated into a 50 W load.
6-4 ROUTINE MAINTENANCE Routine maintenance that can be performed by the operator consists of cleaning the fan filter , cleaning the data display , and replacing a defective line fuse. Cleaning the Fan Filter The 681XXC must always receive adequate ventila - tion.
free cloth. Do not use abrasive cleaners, tissues, or paper towels which can scratch the plastic surface. Replacing the Line Fuse The value of the line fuse used in the 681XXC is de - termined by the line voltage selection—a 5A type T line fuse for 1 10 V ac line voltage; a 2.
Step 3 Replace the fuse in the fuse holder . Step 4 Install the fuse holder in the rear panel. Using the screwdriver , rotate the fuse cap clockwise to secure the fuse holder in place.
T able of Contents 7-1 INTRODUCTION ...................7 - 3 7-2 MASTER-SLA VE OPERA TION ...........7 - 4 Connecting the Instruments ...........7 - 4 Initiating Master-Slave Operation ........7 - 5 Master-Slave Operation .............7 - 7 Master-Slave Operation in VNA Mode .
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Chapter 7 Use W ith Other Instruments 7-1 INTRODUCTION This chapter provides information and instructions for using the Se - ries 681XXC Synthesized Signal Generator with other Anritsu instu - ments. It contains the following: q Instructions for interconnecting and operating any two 68XXXC and/or 68XXXB instruments in a master-slave configuration.
7-2 MASTER-SLA VE OPERA TION Master-slave operation consists of connecting any two 68XXXC and/or 68XXXB instruments together and configuring them so that they pro - duce CW and synchronized, swept output signals at an operator- selectable frequency offset.
Step 4 Connect the Master instrument RF OUT - PUT and the Slave instrument RF OUT - PUT to the appropriate connections on the DUT . Initiating Master-Slave Operation The following paragraphs describe how to set up both instruments to perform master-slave opera - tions.
This menu lets you edit the listed frequencies for the Slave instrument. Use the cursor control key to select a frequency pa - rameter from the list, then press Edit to edit its value. Edit the current frequency parameter value using the cursor control key or rotary data knob or enter a new value using the key pad and approriate termination key .
pad and appropriate termination key . When you have finished setting the open parameter , close it by pressing its menu soft-key or by making another menu selection. Press Enable to begin master-slave operation. Press CW to return to the CW Menu display .
Press VNA Menu to go to the VNA Menu display (below). This menu lets you set the frequency offset and out- put power level for the Slave instrument in the VNA mode. Press VNA Offset to open the slave frequency offset parameter . Press VNA Level to open the slave output power level parameter .
T erminating Master-Slave Operation The following describes how to terminate master- slave operation and return the Slave instrument to local (front panel) control. On the Master instrument, select CW mode. At the CW Menu, press Master Slave to go to the Master Slave Menu display .
7-3 USE WITH A 56100A SCALAR NETWORK ANAL YZER The 681XXC is directly compatible with the Anritsu Model 56100A Scalar Network Analyzer (SNA). The following paragraphs provide instructions for connecting the signal generator to the 56100A SNA so that is can be used as a signal source for the analyzer .
7-4 USE WITH A 360B VECTOR NETWORK ANAL YZER The 681XXC signal generator is compatible with the Anritsu Model 360B V ector Network Analyzer (VNA). The following paragraphs pro - vide instructions for connecting the 681XXC to the 360B VNA and con - figuring the signal generator so that it can operate as a signal source for the analyzer .
If the 681XXC contains an Option 16 high-stability time base, connect the coax - ial cable between the 681XXC rear panel 10 MHz REF OUT connector and the 360B rear panel 10 MHz REF IN connector . Step 3 Connect one end of a GPIB cable, 1 meter in length, to the 681XXC rear panel IEEE-488 GPIB connector .
At the System Configuration menu, press GPIB . The Configure GPIB Menu (below) is displayed. V erify that the GPIB address and terminator shown on the display match the System Bus source address and data terminator that are set on the 360B VNA. If the address of the 681XXC on the System Bus needs changing, press GPIB Address .
T erminating 360B Source Lock Mode Opera - tions T o terminate 360B VNA source lock mode opera - tions, you must first return the 681XXC to local con - trol and then turn off the SS Mode. T o return the 681XXC to local control, turn off the 360B VNA. On the 681XXC, press SYSTEM , then Reset .
If the address of the 681XXC on the System Bus needs changing, press GPIB Address . Enter the new address using the cursor control key or the data entry keypad and the terminator key HZ ms ADRS The new GPIB address will appear on the display . T o change the data terminator , press Line T erm to select the correct GPIB data delimiter .
7-5 USE WITH A HP8757D SCALAR NETWORK ANAL YZER The 681XXC signal generator is compatible with the Hewlett Packard 8757D Scalar Network Analyzer (SNA). The following paragraphs pro - vide instructions for connecting the 681XXC to the HP8757D SNA and setting up the signal generator so that it can operate as a signal source for the analyzer .
Step 3 Connect the special AUX I/O interface cable (Anritsu Part No. 806-90) to the 681XXC rear panel AUX I/O connector . Connect the cable end having BNC con - nectors as follows: a. Connect the cable end labeled “SEQ SYNC” to the HP8757D rear panel POS Z BLANK connector .
Press GPIB Address to change the address of the 681XXC on the bus. Enter 19 using the cursor con - trol key or the data entry keypad and the termina - tor key HZ ms ADRS The new GPIB address (19) will appear on the dis- play . Press More to go to the First Additional Configure GPIB menu (below).
Initiating HP8757D SNA Operation T urn ON the HP8757D to initiate scalar network analyzer operation. (Refer to the Hewlett Packard Model 8757D Scalar Network Analyzer Operation Manual for operating instructions.
Appendix A Rear Panel Connectors A-1 INTRODUCTION This appendix provides descriptions for the rear panel connectors on a typical Series 681XXC Synthesized Signal Generator . A-2 REAR P ANEL CONNECTORS Figure A-1 provides a illustration of the rear panel and describes the rear panel connectors.
A-2 681XXC OM REAR PANEL CONNECTORS I N 1 0 M H z R E F O U T EXT A L C I N F M I N A M I N H O R I Z O U T 1 0 M H z R E F I N S E R I A L I/O A U X I / O N O T E : U S E S L O W B L O F U S E S O N .
681XXC OM A-3 AUX I/O: 25-pin connector that provides for single cable interface with another 68XXXB/C (master-slave operation) and with other Anritsu instruments such as the Anritsu 56100A Scalar Network Analyzer . A pinout diagram for this connector is shown in Figure A-2.
A-4 681XXC OM PIN SIGNAL NAME SIGNAL DESCRIPTION 1 HORIZ OUTPUT Horizontal Sweep Output: Provides a 0V at beginning and +10V at end of sweep for all sweep modes, regardless of sweep width. In the CW mode, the voltage is proportional to frequency between 0V at low end and +10V at the high end of range.
681XXC OM A-5 PIN SIGNAL NAME SIGNAL DESCRIPTION 14 V/GHz V/GHz Output: Provides a reference voltage relative to the RF output frequency (1.0 V/GHz for Models 681 17C, 68137C, and 68147C; 0.5 V/GHz for Model 68167C; 0.25V/GHz for Models 68177C, 68187C, and 68197C).
A-6 681XXC OM IEEE-488 GPIB 13 14 15 16 17 18 19 20 21 22 23 24 1234567 89 10 11 12 PIN SIGNAL NAME SIGNAL DESCRIPTION 1-4 DIO 1 thru DIO 4 Data Input/Output: Bits are HIGH when the data is logical 0 and LOW when the data is logical 1.
Appendix B Performance Specifications FREQUENCY CW MODE Output: T wenty independent, presettable CW frequencies (F0 – F9 and M0 – M9). Accuracy: Same as internal or external 10 MHz time base.
360B VNA SOURCE LOCK MODE Under control of the Anritsu 360B V ector Network Ana - lyzer , the synthesized signal generator is phase-locked at a typical <8.5 ms/step sweep speed. Frequency resolution is limited to 100 kHz. Minimum specified frequency is 2.
SINGLE-SIDEBAND PHASE NOISE (dBc/Hz) POWER LINE and F AN ROT A TION SPURIOUS EMISSIONS (dBc) RESIDUAL FM (CW and Step Sweep modes, 50 Hz - 15 kHz BW) RESIDUAL FM (Analog Sweep and Unlocked FM modes, 50 Hz - 15 kHz BW) AM Noise Floor: T ypically < – 145 dBm/Hz at 0 dBm output and of fsets >5 MHz from carrier .
RF OUTPUT Power level specifications apply at 25 °± 10 ° C . MAXIMUM LEVELED OUTPUT POWER PERFORMANCE SPECIFICATIONS Note: In models with Option 22 that have a high-end frequency of £ 20 GHz, rated output power is reduced by 1 dB In models with Option 22 that have a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.
LEVELED OUTPUT POWER RANGE Standard Units Without an Attenuator: Maximum leveled power to – 15 dBm ( – 20 dBm typical). With an Attenuator: Maximum leveled power to – 120 dBm.
User Level Flatness Correction: Number of points: 2 to 801 points per table Number of tables: 5 available Entry modes: GPIB power meter or computed data CW POWER SWEEP Range: Sweeps between any two power levels at a single CW frequency . Resolution: 0.
REMOTE OPERA TION All instrument functions, settings, and operating modes (except for power on/standby) are controllable using com - mands sent from an external computer via the GPIB (IEEE-488 interface bus).
W arm Up Time: From Standby: 30 minutes. From Cold Start (0 ° C): 120 hours to achieve specified frequency stabiltiy with aging. Instruments disconnected from ac line power for more than 72 hours require 30 days to return to specified fre - quency stability withaging.
AUX I/O (Auxiliary Input/Output): Provides for most of the rear panel BNC connections through a single, 25-pin, D-type connector . Supports master-slave operation with an - other 68XXXB/C synthesizer and allows for a single-cable interface with the Model 56100A Scalar Network Analyzer and other Anritsu instruments.
Subject Index Number 681XXC Front Panel Layout, 3-6 General Description, 1-3 Manual, Electronic, 1-5 Manuals, Related, 1-5 Models, List of, 1-4 Options, List of, 1-6 Performance Specifications, B-1 Re.
L Leveling Operations ALC Power Slope, 3-65 Attenuator Decoupling, 3-64 External Leveling, 3-61 Fixed Gain, 3-63 Internal Leveling, 3-61 Menu Map, 4-14 Selecting a Leveling Mode, 3-60 User Cal (User L.
Operating Modes, 3-77 Providing Square W ave Modulation, 3-77 SS Mode Operation, 7-12 Start Up, 3-14 Start-Up Display , 3-14 Step Sweep Frequency Mode Menu Map, 4-8 Sweep Frequency/Step Power Mode Men.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Anritsu 681XXC è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Anritsu 681XXC - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Anritsu 681XXC imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Anritsu 681XXC ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Anritsu 681XXC, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Anritsu 681XXC.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Anritsu 681XXC. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Anritsu 681XXC insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
