Manuale d’uso / di manutenzione del prodotto 3803 del fabbricante LG
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LG 3803 8VSB/QAM SIGNAL GENERA T OR INSTRUCTION MANUAL LEADER ELECTRONICS CORP ..
T ABLE OF CONTENTS GENERAL SAFETY SUMMAR Y ............................................................................................. I 1. INTRODUCTION ................................................................................................
5.4 LEVEL ..................................................................................................................... 5-6 5.5 BER ...............................................................................................................
GENERAL SAFETY SUMMAR Y ■ T o Av oid Personal Injury It is recommended that only qualified personnel with technical knowledge use this instrument only after reading and fully underst anding all functions of the instrument described this instruction manual.
GENERAL SAFETY SUMMAR Y Review the following safety precautions to avoi d operator's injury and lo ss of life and prevent damage and deterioration to this instrument.
GENERAL SAFETY SUMMAR Y W ARNING ■ W arning on Installation Environment s ● About the Guaranteed Operating T emperature Range Operate the instrument between the temperature range of 0 to 40 °C. Operating the instrument at higher temperatures could cause a fire hazard.
GENERAL SAFETY SUMMAR Y CAUTION ■ Caution on Input/Output T erminals Input T erminals are rated with a maximum input. Do not supp ly an input over the specified rating in the standard section of t he instruction manual. Also, do not supply external power to Output terminal, this could cause the instrument to malfunction.
1. INTRODUCTION Thank you for purchasing Leader ’s measuring instrument s. Please read this instruction manual carefully to ensure correct and safe operation. If you have any difficulties or questions on how to use the instrument af ter you have read this manual, please feel free to contact your local Le ader agent.
CAUTION 1.2.2 Maximum Input V oltage There is restriction when applying input signals. Applying excessive voltage to the connector may result instrument damage. Connector Allowable Input V oltage REMOTE CONTROL INC, DEC, RESET Pins -0.5 V/+5.5 V FREQ STD 10 MHz INPUT 2.
1.2.5 Inst allation Do not use the instrument in the following environments. • High temperature environments Do not place the instrument under direct sunlight or near a heater (e.g., st ove). Do not move the instrument from cold to warm environment abruptly , it may cause condensation.
2. SPEC IFICA TIONS 2.1 Description The LG 3803 8VSB/QAM Signal Generator , conforms to 8VSB (digital terrestrial TV in USA System) and 64QAM/256QAM (CA TV) standards, features a channel coding, modulation, C/N generator , and up converter in a single package.
2.3 Specifications 2.3.1 Channel Coding Section (1) Broadcasting system Digital T errestrial (A TSC A/53B) CA TV (ITU-T J.83 annex B) (2) Modulation system 8VSB/64QAM/256 QAM 2.3.2 RF Signal Generator (1) Frequency Range 50 to 900 MHz Resolution 1 kHz, set in frequency Channel USA, KOREA Accuracy ±0.
(4) ASI, SPI Input S pecifications Input Packet Format 188 bytes Applicable S tream MPEG-2 TS (ISO/IEC 13818-1) Input Data Rate 25 Mbps max. (5) FREQ STD Input Input Connector BNC Input Impedance 50 Ω Input Level 0.
2.3.6 External Interface (1) Memory Card Interface Memory Card Compact flash card (CF A TYPE-I) Function Updating firmware, changing internal TS-ROM (2) ETHER Interface S pecifications 10BASE-T or 100BASE-TX Function Setting this instrument, reading status (3) GPIB S pecifications ANSI/IEEE S td 488.
3. P ANEL DESCRIPTIONS 3.1 Front Panel ○ 18 ○ 14 ○ 13 ○ 11 ○ 4 ○ 3 ○ 21 ○ 2 ○ 6 ○ 9 ○ 8 ○ 10 ○ 12 ○ 5 ○ 16 ○ 17 ○ 15 ○ 19 ○ 20 ○ 7 ○ 1 Figure 3-1 LG 3803 front panel ○ 1 POWER switch Push this switch in to apply power .
○ 7 ME MORY CARD sl ot Only used when the memory card contents are upgraded or updated. ○ 8 UP MENU key While displaying the setting screen, pressing this key enters the current dat a, then returns to the upper level by one. Holding down this key for at least one second enters the current setting, t hen returns to the top screen.
○ 16 RECALL key Recalls the setting conditions in the specified address. ○ 17 ↑ , ↓ key Increments and decrement s the specified address. ○ 18 UNIT key (UNIT) Selects either this instru ment or OOB when the LG 3803-01 unit is connected. ○ 19 REMOTE key (REMOTE) Switches the remote control mode to local control mode.
3.2 Rear Panel ○ 22 ○ 24 ○ 33 ○ 34 ○ 27 ○ 31 ○ 32 ○ 26 ○ 31 ○ 39 ○ 23 ○ 25 ○ 28 ○ 29 ○ 30 ○ 35 ○ 36 ○ 37 ○ 38 Figure 3-2 LG 3803 rear panel ○ 22 FREQ STD 10 MHz INPUT connector Accepts the external reference sign al.
○ 31 Cooling fans (T wo places) T o prevent instrument damage due to overheating, do not block airflow through the ventilation holes. If the fan stops, the LCD p anel displays alarm message. T urn the instrument power off immediately , then contact your local Le ader agent in this case.
4. LCD P ANEL DESCRIPTION 4.1 T urning Power On and St arting Instrument Connect the accessory power cord between the AC inlet on the rear panel and the mains. Press the POWER switch to turn power on for starting the system. Whit for about 45 seconds until the top screen (S tatus screen) is displayed.
8 BER result display Displays the Bit Error Rate (BER) measurement value and GO/NO-GO results based on the threshold values. 9 Interleave Displays "- - -" when the carrier modulation is 8VSB. Displays the interleave length when the 64QAM or 256QAM is selected.
<<Alarm display on the top screen>> • The following alarm message is displayed on the top screen. Message is displayed in red. [F AN] Indicates cooling fan trouble. If this alarm is display ed, turn the instrument power off, then cont act your local Leader agent.
<Setting screen example "CODING"> ○ 14 ○ 15 ○ 16 ○ 18 ○ 17 ○ 16 ○ 15 ○ 14 ○ 16 ○ 18 ○ 17 Figure 4-2 Setting screen example (1) 14 Screen title, hierarchica l layer display Displays the screen title and hierarchical layer from the top menu.
<Setting screen example "LEVEL"> ○ 19 ○ 19 ○ 20 Figure 4-3 Setting screen example (2) 19 Numeric value display column Displays the current setting value. When data is set by using the numeric keyp ad, the value is displayed in white on the black background.
4.3 Menu The top screen only displays the current setting status; there is no setting items. When changing the setting st atus, press the MENU key to display the setting screen. The MENU key function is listed below: CODING Selects the broadcastin g system and modulation mode.
5. USING MENU 5.1 CODING Pressing the CODING key in the MENU group enters setting screen. Figure 5-1 Coding screen This screen is used to select the modulation mode and TS signal, and to set items re lated to channel coding. T o exit settings, press other key in the MENU, or hold down the UP MENU key to return to the top screen (status display).
5.1.1 Source The TS source can be selected by pressing the Source (F1) key on the Coding ( L-1) screen. Notes on selecting TS_source • The receiver is temporary unlocked when TS source (each pattern stored in the ROM, PN, SPI, ASI) is switched since the coding circuit is reset.
(1) Selecting PN The random signal (PN23) can be output by setting the Source to PN on the TS Source (L-2) screen. (2) Selecting ROM Pattern The pattern stored in the ROM (called ROM p attern) can be selected by setting the Source to ROM on the TS Source (L-2) screen, then press the Pattern (F1) key .
5.2 NOISE Figure 5-4 C/N setting screen • Up (F2) Increments the C/N value by preset step size within the acceptable range. • S tep Size (F3) Set s the step size for Up and Down operations. • Down (F4) Decrements the C/N value by preset step size within the acceptable range.
5.3 CHANNEL Figure 5-5 Channel or Frequency setting screen • Country (F1) Select s the channel tables of USA or KOREA. • Up (F2) Increment s the channel or frequency by preset step size within the acceptable range. • S tep Size (F3) Sets the steps for Up and Down operations.
5.4 LEVEL Figure 5-6 Level setting • Up (F2) Increments the level value by preset step size within the acceptable range. • S tep Size (F3) Sets the steps for Up and Down operations. • Down (F4) Decrements the level value by preset step size within the acceptable range.
5.5 BER Figure 5-7 BER setting and measurement • BER Setup (F1) Sets the BER measurement conditions. Refer to Section 5.5.1. • Up (F2) Increment s the C/N or output level value by preset step size within the acceptable range. • S tep Size (F3) Selects the steps for C/N or output level.
5.5.1 BER SETUP Figure 5-8 BER SETUP screen • Interface (F2) Selects the TS input for BER measurement. Parallel Use the SPI connector . Serial (2 Wire) Use both [CLOCK] and [DA T A] connectors in the SERIAL INPUT group. Serial (4 Wire) Use all of four connectors in the SERIAL INPUT group.
5.6 UTILITY Figure 5-9 Utility screen Software V e rsion Displays the control soft ware version. Provide the serial number indicated on the rear p anel and software number when cont acting us. TS ROM V ersion Displays the ROM p attern version. Installed Unit Displays the option installed.
5.6.1 CONFIG Figure 5-10 CONFIG screen • TCP/IP (F1) Sets the IP-Address, Subnet Mask and Default Gateway . (Refer to Section 6.5.2) • GPIB Adr . (F2) Sets the GPIB Address.
5.6.2 TCP/IP Figure 5-1 1 TCP/IP screen • Item Select (F5) Selects the item that input s the numeric value. The values can be directly entered by using the numeric keypad. Notes on TCP/IP setting ＊ The setting conditions will be recalled when the power is t urned on.
5.6.3 GPIB ADDRESS Figure 5-12 GPIB ADDRESS screen • GPIB Adr . Up (F2) Increments the GPIB ADDRESS within the acceptable range. • GPIB Adr . Down (F4) Decrements the GPIB ADDRESS wi thin the accept able range. The setting value can be directly entered by using the numeric keypad, or changed by using the ↑,↓, Up (F2) and Down (F4) keys.
5.6.4 PRESET GROUP Figure 5-13 PRESET GROUP screen • CF Access (F1) Save the PRESET DA T A to the memory card and load it from the memory card. (Refer to Section 5.6.5) • Group No. Up (F2) Increments the Group No. within the accept able range. • Group No.
5.6.5 CF ACCESS Figure 5-14 CF ACCESS screen S tatus The operation status of SA VE/LOAD to the memory card is displayed. • Preset to CF (F1) Save the PRESET DA T A to the memory card. • CF to Preset (F2) Load the PRESET DA T A from the memory card to internal memory .
6. PRESET , GROUP 6.1 Preset Up to 100 setting conditions can be stored and recalled by using the fron t panel key . • S toring Dat a (1) Set the CODING , CHANNEL, LEVEL, etc.
7. REMOTE CONTROL This instrument can be remotely controlled (e.g., increment s or decrements preset dat a) via the REMOTE CONTROL connector . (1) Major Function Increment, decrement, returning group top (2) Connector 57LE-40240-7700 (DDK Ltd.) or equivalent (3) Input Level TTL (Pull up to +3.
8. GPIB Since this instrument provides the GPIB (IEEE 488) connector as st andard, major functions can be remotely controlled via the GPIB interface. Note The GPIB capability of this instrument is confirmed by using the GPIB board (PCI-GPIB, PCMCIA-GPIB) manufactured by National Instruments Corporation (NI).
8.3 Interface Message Function T able 8-2 Interface message and ASCII code Upper 4 bits 0 1 2 3 4 5 6 7 Lower 4 bits ASC MSG ASC MSG ASC MSG ASC MSG ASC MSG ASC MSG ASC MSG ASC MSG 0 NUL SPC 0 @ P ` p.
8.5 Clear , Reset The Clear and Reset modes can be controlled by using the commands. The followings describe the reply for the clear and reset oper ations. (1) IFC (Interface clear) Reply of the universal command (IFC) is listed below . • Cancels specified talker and listener .
8.7 Multiline Message Command T able 8-3 lists the multiline message command types and a reply to each command. T able 8-3 Reply of mul tiline message command T ype Name Description Reply DCL Clearing.
(3) Program message unit sep arator Use a semicolon ";" (3Bh in ASCII code) when transfers multiple messages simultaneously . (4) Program data sep a rator Use a comma "," (2Ch in ASCII code) to delimit multiple parameters.
T able 8-5 Query code list Header Dat a Description Reply 1 SY ? Reading mod ulation mode selected n 2 T S ? Reading sig nal selected to TS input n, p, q, r 3 CO ? Reading setting status of CN on (1),.
8.12 Det ail Program Code This section describes the det ail program codes listed in Section 8.1 1. Definition: n, p, q, r , s 0 and natural number i Integer including decimal point ne Real number including exponential number _ S pace (20h in ASCII code) • T erminator is omitted for a syntax.
For Internal (OP70 installed. Reply only; no setting is required.) p Drive Used 0 HDD 1 DVD For ROM p Pattern Selection 0 Color Bar 1 Ramp 2 Monoscope q Screen Size Selection 0 1920 x 1080i (16:9) 1 1.
(3) Setting C/N on/off ............................... "CO" Function Setting and querying C/N set in S tep (4) on/off. Syntax CO_n (Setting, reply) CO_? (Query) n C/N On/Off 0 Off 1 On (4) Setting and querying C/N value .......... "CN" Function Setting and querying C/N value added.
(9) Reading BER measurement value ..... "BR" Function Reading BER measurement value. Syntax ne (Reply) BR_? (Query) BER value ne: Replied in exponential format of 0.00E-0 ＊ This program code can only be used when the Source on the TS Source screen is set to PN.
(13) Setting BER measurement interval .... "BI" Function Setting and querying BER measurement interval. Syntax BI_p (Setting, reply) BI_? (Query) BER measurement interval p: 0.1 to 3600.0 sec. Ef fective down to one digit after the decimal point.
(18) Setting frequency in current steps "DF" Function Setting and querying increment/decrement of frequency in current steps. Syntax DF_n (Setting, reply) DF_? (Query) n Frequency S teps 0 0.001 1 0.01 2 0.1 3 1.0 4 10.0 ＊ This program code is ignored when frequency is set in channel.
(23) Selecting reference clock "CK" Function Setting and querying reference clock. Syntax CK_n (Setting, reply) CK_? (Query) n Reference Clock 0 Internal 1 External input (24) Writing preset memory ....................... "ST" Function S toring current setting conditions to specified number .
(30) Setting group "GS" Function Setting and querying group. Syntax GS_n, p, q (Setting, reply) GS_n_? (Query) n Group numb er 0 to 9 p Begin address 0 to 98 q End address 1 to 99 ＊ The address numbers should be: begin address < end address.
9. ETHERNET 9.1 Connection When constructing the network system via the ETHER connector , use a STP cable conforming to 100BASE-TX standards. Use a straight cable when connecting the network via a hu b. Use a cross cable when connecting a personal computer .
10. MAINTENANCE The LG 3803 is designed to operate stably under normal handling. If you have questions regarding calibration and service, cont act your local Leader agent. ■ Open Source This instrument partially uses the open source distributed under the terms of the GNU General Public License.
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 LG 3803 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 LG 3803 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso LG 3803 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul LG 3803 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il LG 3803, 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 LG 3803.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il LG 3803. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo LG 3803 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.
