Manuale d’uso / di manutenzione del prodotto 5401 del fabbricante Symmetricom
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5401 Airborne Disciplined Rubidium Oscillator 5402 Disciplined Rubidium Oscillator Operating Manual Preliminary Re v . A, May 2005 PN 8500-0150.
Symmetricom, Inc. 2300 Orchard Par kway San Jose, CA 95131-1017 U.S.A. http://www .symmetricom.com Copyright © 1999–2005 Symm etricom, Inc. All rights reserved. Printed in U.S.A. This manual is provide d to assist the user in th e operation and maintenance of the supplied equipment or software.
PN 8500-0150, Rev . A, May 200 5 iii Operating Manual Preface Pr eface Limited W arranty Each new product manufactured by Symmetricom is warrante d for defects in material or workmanship for a period of one yea r from date of shipment (“Limited W arranty”).
Operating Manual Preface PN 8500-0150, Rev . A, May 200 5 iv Limitation of Liability By purchasing any product from Symmetricom, the Buyer con sents to and agree s that the Buyer ’s sole and exclusi.
PN 8500-0150, Rev . A, May 2005 v Operating Manual Preface Conventions Used in This Guide This guide uses the follo wing conventions: Acronyms and Abbreviations – T erms are spelled ou t the first time they appear in text. Thereafter , only the acronym or abbreviation is used.
Operating Manual Preface PN 8500-0150, Rev . A, May 2005 vi T able 2 T ypographical Conventions When text appears this way ... ... it means: SSU-2000 User’s Guide The title of a document. SSU CRITICAL IOC1 An operatin g mode, alarm state, status, or cha ssis label.
PN 8500-0150, Rev . A, May 2005 Contents -1 Operating Manual Contents Preface Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii Limitation of Liability . . . . . . . . . . . . . . . . .
Operating Manual PN 8500-0150, Rev . A, May 2005 Contents-2 Burst Status On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Burst Status Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PN 8500-0150, Rev . A, May 2005 1 Operating Manual Introduction 1 — Intr oduction Pr oduct Overview The purpose of the Symmetricom 5 401 Airb orne Disciplined Rubidi um and 5402 Disciplined Rubidium Oscillator (DRO) is to provide a precise time and frequency reference for other equipment.
Operating Manual Introduction PN 8500-0150, Rev . A, May 2005 2 Symmetricom 5401 Airborne Disciplined Rubidium Oscillator The Symmetricom 5401 is built in an airborne p ackage that is powered b y standard aircraf t power (+28 VDC) and is installed by mounting t he chassis on a flat base plate.
PN 8500-0150, Rev . A, May 2005 3 Operating Manual Installation 2 — Installation Installation This section describes the unp acking, inspection, installation, and operation of the Symmetricom 5401 and 5402 Discip lined Rubidium Oscillators. Unpacking and Inspection The DRO is packaged in one shipping cont ainer .
Operating Manual Installation PN 8500-0150, Rev . A, May 2005 4 The 5401 is now operationa l and will begin to discipline the Rubidium using the control parameters that wer e previously stored in battery-backed RAM when th e unit was last powered-down.
PN 8500-0150, Rev . A, May 2005 5 Operating Manual Installation Symmetricom 5402 Rack Mounting Pr ocedure The 5402 is designed for st andard nineteen-inch rack mounting. Optional chassis slides are recommended if the unit is t o be inst alled in an equipme nt rack.
Operating Manual Installation PN 8500-0150, Rev . A, May 2005 6 Symmetricom 5402 Installation Pr ocedur e 1. Install the unit in th e desired location a nd c onnect the unit to a n AC power source. Refer to Chapter 4 for specification s and connector designations and location s.
PN 8500-0150, Rev . A, May 2005 7 Operating Manual Operation 3 — Operation Neither the 5401 nor the 5402 have any external m anual controls. Signal output amplitude is controlled by internal potentiometers, which are located as described in Chapter 2 .
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 8 T able 1 DRO Commands Via RS-232 S tatus Request Command Format:.
PN 8500-0150, Rev . A, May 2005 9 Operating Manual Operation Description: Rx - Rubidium lock; x=0 not Locked, x=1 Locked Dx - Discipline On/Off; x=0 di scipline off, x=1 discipline on Px - 1 PPS input present; x= 0 not present, x=1 present Vx - V alid 1 PPs; x=0 unstable, x=1 stable.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 10 Response Format: Discipline On Command Format: Description: The oscillator discipline is turned o n. When the conditions are favorable , the discipline algorithm will control the oscillator .
PN 8500-0150, Rev . A, May 2005 1 1 Operating Manual Operation Response Format: Enter KM Command Format: Description: kkkkkk - Base number for Km ; kkkkkk (000000 to 999999) repr esents a number from 0 to 0.999999. Km controls the mix ratio of of fset error and frequency error compensation in the discipline algorithm.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 12 Description: nnnnnn - Base numbe r for Ko1; nnnnnn (000000 to 999999) represents a numb er from 0 to 0.999999. Ko1 controls the cut of f frequency of the offset error n oise filter . oooooo - Base numbe r for Ko2; oooooo (000000 to 999999) represents a numb er from 0 to 0.
PN 8500-0150, Rev . A, May 2005 13 Operating Manual Operation Enter Resync Delay When the 1 PPS In is lost or becomes invalid (rate threshold is exceeded), the unit is placed into a holdover mode. It remains in th is mode until the 1 PPS In is valid for a time pe riod (in seconds) determined by "Resync Delay".
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 14 Burst S tatus On Command Format: Description: S tatus will b e output every second. Response Format: Burst S tatus Off Command Format: Description: T urns burst status off. Response Format: No Response.
PN 8500-0150, Rev . A, May 2005 15 Operating Manual Operation Figure 5 DRO Discipline Sequence Flowchart Request TI Command Format:.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 16 Description: Ttttttt.ttt - T ime Interval; tttttt.ttt is the time interval (0 to 999999.999 microseconds) of the last 1 PPS event. Sssssss.s - Seconds Counter; ss ssss.s is the second count (0 to 999999.
PN 8500-0150, Rev . A, May 2005 17 Operating Manual Operation r - Revision Letter of Firmware. Response Format: Enter S tart-up Parameters Command Format: Description: n - S tart-up Index; n (1 to 6) select s which one of 6 elements in the st art-up table that will be modified.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 18 Response Format: Description: Nn - S tart-up Index; n (1 to 6) identifies which one of 6 elemen ts in the st art-up table was reported. Ggg.g - Dynamic Gain V alue; gg.g (0 to 99.9 ) represents the dynamic gain value that will be used during st art-up for element "n".
PN 8500-0150, Rev . A, May 2005 19 Operating Manual Operation Set Defaults Command Format: Description: Returns the unit to a default st ate. T able 2 Default V alues Parameter Default V alue Discipline On Dynamic Gain Floor 4 Dynamic Gain Ceiling 30 Dynamic Gain Rate Factor 0.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 20 Response Format: Enter 1 PPS Offset (not implemented) Command Format: Description: yyyyyy .yyy - 1 PPS Offset; yyyy yy .yyy (0 to 999999.999 micros econds) is amount of extra delay applied to the 1 PPS output.
PN 8500-0150, Rev . A, May 2005 21 Operating Manual Operation Description: In T able 3 is a list of the data found in the response. The dat a is in the same format as the associated "Enter" command. A sp ace exist s between each of the p aramete rs, except where noted.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 22 Description: The input 1 PPS can be sliced at two deferent le vels. This command selects which slicing level is used. x=0 - High 5 volt input threshold, x= 1 - Low 2.5 volt input threshold.
PN 8500-0150, Rev . A, May 2005 23 Operating Manual Operation The srr .rrrr is a number from -9 9.9999 to +99.9999 mi croseconds per second. The number is frequency change from DAC = 00000 to 65535 of the unit.
Operating Manual Operation PN 8500-0150, Rev . A, May 2005 24 Cal S tatus Command Format: Description: Cx - Calibration status: Response Format: Enter Estimation Filter T ime Constant Command Format: Description: nnnnnn - Base numbe r for the filtered rate exponential integra tor; nnnnnn (000000 to 999999) represent s a number from 0 to 0.
PN 8500-0150, Rev . A, May 2005 25 Operating Manual Operation Enter Dynamic Gain Factors Command Format: Description: Rrr .rrrr - Rate Factor; the normalizing value (i n nanoseconds) for rate when calculating the next dynamic gain. Oooo - Offset Factor; the normalizing value (in nanoseconds) for of fset (TI) when calculating the next dynamic gain.
Operating Manual S pecifications PN 8500-0150, Rev . A, May 2005 26 4 — Specifications This section cont ains the electrical, physical, and environ mental specifications for the 5401 and 5402 Disciplined Rubidium Oscillator .
PN 8500-0150, Rev . A, May 2005 27 Operating Manual S pecifications Output Specifications and Characteristics 5401 RS-232 Inp ut/Output T ype MS27499E10B35S 5401 Connector Pin Assignment s: Pin Functi.
Operating Manual S pecifications PN 8500-0150, Rev . A, May 2005 28 Coherence a The 1 PPS OUT time delay is < 10 nanoseconds from the mean of the 1 PPS Input Port to Port Isolation 90 dB Isolation .
PN 8500-0150, Rev . A, May 2005 29 Operating Manual S pecifications 5401 Indicators (Fr ont Panel) 5402 Indicators (Fr ont Panel) DRO Internal T ime Bases T able 6 5401 Indicators (Front Panel) Power (LED) Indicates power applied to th e unit (see Figure 6 ).
Operating Manual S pecifications PN 8500-0150, Rev . A, May 2005 30 10 MHz Oven Oscillator Spur s: Harmonic 50 dBc Non-Harmonic 90 dBc Input V oltage Ra nge +19 to +32 VDC Input Power (Quiesc ent) 13 watts @ 25 ºC (+24 VDC) T able 9 10 MHz Oven Oscillator Output W a veform 10 MHz sine wave Output Level 0.
PN 8500-0150, Rev . A, May 2005 31 Operating Manual S pecifications 5401 Dimensions Figure 6 5401 Mounting Dimensions 5401 W eight Approximately 8 pounds.
Operating Manual S pecifications PN 8500-0150, Rev . A, May 2005 32 5402 Dimensions Figure 7 5402 F ront Panel Figure 8 5402 Re ar Panel Envir onment Height 1.
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 Symmetricom 5401 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 Symmetricom 5401 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Symmetricom 5401 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Symmetricom 5401 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Symmetricom 5401, 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 Symmetricom 5401.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Symmetricom 5401. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Symmetricom 5401 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.
