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Symmetricom 5071A, Operating And Programming Manual

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Chapter 2  Using the 5071A 

Steering the Output Frequency 

 

24

 

 

 

 

 

            Operating and Programming Manual

 

 

The  steering  value  is  NOT  stored  in  the  5071A  non-volatile  memory.  If  the 
Continuous  operation  LED  is  flashing  any  time  after  a  reset,  it  indicates  that 
power  was  lost  during  operation.  This  would  mean  that  any  steering  value  you 
have  previously  entered  is  no  longer  in  effect.  You  will  need  to  re-enter  the 
steering value as part of the reset procedure. 

To Check an Offset 

Use the following procedure to determine the value of an active offset. 

1

  Select the STEER menu, then press 

Enter

. 

 

The LCD display shows the current offset value with an accuracy of 
1 x 10

-15

. 

2

  Leave the active menu by pressing 

Prev

. 

 

To Remove an Offset 

1

  Select the STEER menu, then press 

Enter

. 

2

  Press 

0

, then 

Enter

 to clear the offset. 

The ATTENTION light goes out.

NOTE 

 
 
 
 
 

Summary of Contents for 5071A

Page 1: ...5071A Primary Frequency Standard Operating and Programming Manual Rev H August 14 2009 Part Number 05071 90041 ...

Page 2: ......

Page 3: ..._________ Operating and Programming Manual SERIAL NUMBER PREFIX US4835 See Instruments Covered by this Manual in the Introduction for information about manual applicability and your instrument Symmetricom 5071A Primary Frequency Standard ...

Page 4: ...quipment may be impaired Before Applying Power Verify that the product is set to match the available line voltage and the correct fuse is installed Refer to instructions in Chapter 1 of this Manual Before Cleaning Disconnect the product from operating power before cleaning Clean only with lightly damp cloth and mild detergents Do not get unit wet Safety Earth Ground An uninterruptible safety earth...

Page 5: ... power ratings on the Model 5071A Unit s nameplate and the additional load the Model 5071A Unit may place on the supply circuit Overloading the supply circuit may adversely affect the supply wiring and over current protection Reliable Earthing Maintain reliable earthing grounding of rack mounted equipment Pay particular attention to supply connections other than direct connections to the branch ci...

Page 6: ...IS EXTERNAL GROUND BE CONNECTED TO A RELIABLE EARTH GROUND ANY INTERRUPTION OF THE PROTECTIVE GROUNDING CONDUCTOR INSIDE OR OUTSIDE THE INSTRUMENT OR DISCONNECTING THE PROTECTIVE EARTH TERMINAL WILL CAUSE A POTENTIAL SHOCK HAZARD THAT COULD RESULT IN PERSONAL INJURY GROUNDING ONE CONDUCTOR OF A TWO CONDUCTOR OUT LET IS NOT SUFFICIENT PROTECTION AVERTISSEMENT RELIER CET APPAREIL À UNE PRISE DE COUR...

Page 7: ...d by the NEC for DC power source hookup The Unit Chassis must be grounded for proper safety WARNING ENSURE THAT A DISCONNECT DEVICE SUCH AS A SWITCH WITH THE APPROPRIATE VOLTAGE CURRENT RATING IS PROVIDED WHEN CONNECTING A DC POWER SOURCE TO THE VDC OPERATION MODEL AVERTISSEMENT S ASSURER QU UN DÉBRANCHER L APPAREIL TEL QU UN COMMUTATEUR AVEC LE CLASSEMENT DE TENSION COURANT APPROPRIÉ EST FOURNI E...

Page 8: ...nt Avant entretenir l intérieur d une unité enlever n importe quelles connexions de pouvoir Connecting the 48 VDC Operation Unit to DC power Note The 48 VDC Operation Model is supplied with two 48 VDC inputs to accommodate input from an alternate DC Power Source Use a 15 amp DC circuit breaker in series with the DC power source Do not connect the unit directly to a DC power source without the brea...

Page 9: ...oftware media which does not execute its programming instructions due to such defects Symmetricom does not warrant that the operation of Symmetricom products will be uninterrupted or error free If Symmetricom is unable within a reasonable time to repair or replace any product to a condition as warranted the customer would be entitled to a refund of the purchase price upon prompt return of the prod...

Page 10: ...OMER S SOLE AND EXCLUSIVE REMEDIES EXCEPT AS INDICATED ABOVE IN NO EVENT WILL SYMMETRICOM OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT SPECIAL INCIDENTAL CONSEQUENTIAL INCLUDING LOST PROFIT OR DATA OR OTHER DAMAGE WHETHER BASED IN CONTRACT TORT OR OTHERWISE For consumer transactions in Australia and New Zealand the warranty terms contained in this statement except to the extent lawful...

Page 11: ...Electronic Equipment Directive WEEE 2002 95 EC For more information about Symmetricom s WEEE compliance and recycle program please visit the Symmetricom s WEEE RoHS website at http www symmetricom com About_Us WEEE_RoHS_Initiatives htm RoHS Restriction of the Use of Certain Hazardous Substances Directive 2002 95 EC This product falls under the category of Monitoring and Control Instruments Equipme...

Page 12: ...Covered by This Manual xxv Suggested Sequence of Reading xxv Chapter 1 Getting Started 1 Chapter 1 Contents 2 The 5071A at a Glance 3 Indicators 3 Controls 3 Connectors 3 Quick Reference Guide to Controls 3 Rear Panel Connections 7 Starting the 5071A 8 Performing Basic Tasks 10 Synchronizing to an External 1 PPS Reference 10 Setting Time and Date 11 Powering Down the 5071A 11 Chapter 2 Using the 5...

Page 13: ...2 To Print the Log 22 Steering the Output Frequency 23 Steering Explained 23 To Add an Offset 23 To Check an Offset 24 To Remove an Offset 24 Using Utility Features 25 To Reset the Continuous Operation Light 25 To Reset the Rear Panel Status Output 25 To Display the Firmware Revision or CBT Identification String 25 Diagnostic Self Tests 25 Configuring the 5071A 26 To Set the Operating Mode 26 To S...

Page 14: ...ogramming 39 Chapter 4 Contents 40 Remote Operation Setup 41 Overview 41 Remote Interface Features 41 Serial Port Description 41 Hardware Connection 42 Serial Port Configuration 44 Remote Modem Setup and Precautions 46 Overview 46 Modem Selection 46 Modem Configuration 46 Verifying Remote Operation with a Terminal 47 Programming Overview 48 SCPI Command Conformance 49 Command Types 50 Common Comma...

Page 15: ...Commands 78 Diagnostic Commands 78 Display Commands 83 Precision Time Date and Time Commands 84 Reference Oscillator Commands 88 STATus Monitoring Commands 90 System Commands 95 Status Reporting 99 Rear Panel Status Output Operation 102 Status Output Programming 102 Serial Port Command Printer Interface 105 Mode Selection 105 Pacing 105 The Prompt 105 End Of Line Characters 105 Error Messages Code...

Page 16: ...paring the 5071A For External DC Operation 127 Replacing the External DC Input Power Fuse 128 Internal Standby Battery Maintenance 129 Battery Shelf Life and Storage 129 Battery Operating Temperatures 129 Battery Charging 130 Battery Disposal 131 Removing and Replacing the Internal Battery 132 Cesium Beam Tube Replacement 133 Long Term Storage 133 Appendix A Performance Tests 135 Introduction 136 ...

Page 17: ...tion 143 5071A Complete Performance Tests 145 Test 1 Output Signals Harmonic Distortion and Spurious Signals Check 145 Test 2 Frequency Accuracy 153 Test 3 Stability 156 5071A PERFORMANCE TEST 157 Appendix B Glossary 159 5071A Glossary 160 Index 163 Service and Support 165 ...

Page 18: ...ts of the following Introducing the 5071A page xvii Operating The 5071A page xix How this Manual is Organized page xxiii Manuals Supplied page xxiv Related Documentation page xxiv Accessories Options and Specifications page xxiv Instruments Covered by This Manual page xxv Suggested Sequence of Reading page xxv ...

Page 19: ...tects departures of the microwave frequency from the cesium energy level transition frequency and corrects them by tuning the VCXO to run precisely at the proper rational fraction of the cesium frequency The microprocessor an integral part of this servo loop performs the error determination and correction several times a second to ensure that the VCXO is always closely locked to the cesium transit...

Page 20: ...t the 5071A s function is significantly enhanced by its capacity for complete remote control via an RS 232C port on the rear panel All front panel functions can be programmed through the port as well as many functions not available via the front panel controls The RS 232C port allows the instrument to Print status reports and internal parameters to an external printer Communicate with and be contr...

Page 21: ...found in Chapter 2 Clock display On power up the clock display is OFF so the clock will not display incorrect time The display may be set and turned on using the front panel controls or the RS 232C interface If you plan to use the Modified Julian Day MJD date system the time should be set to Coordinated Universal Time UTC See below for more information about the MJD 1pps outputs There are three 1p...

Page 22: ...1A output frequency The 5071A output frequency can be steered in a very precise and calibrated manner When steered the stability of the output signals is identical to the un steered signal You can steer the 5071A over a range of 1 part in 109 with a resolution of 6 331991 parts in 1015 These specifications are called the SETTABILITY of the 5071A Steering is accomplished by changing the ratio betwe...

Page 23: ...voltage 40Vdc on both dc inputs or when absent the 5071A switches to 2 Ac line power There is no battery backup for 48V option Remote Operation The 5071A may be operated completely via remote control The RS 232C port on the rear panel allows the 5071A to be connected to a printer a computer or a data terminal Using a modem and a telephone line the 5071A can be connected to these devices anywhere i...

Page 24: ...on page 133 for more information Service If a failure occurs diagnostics operate in Standby mode Remote operation The remote state can only be entered via remote command through the RS 232C port In this state the 5071A operates normally with the front panel controls locked out no changes can be made to parameters like 1PPS delay and no actions can be taken via the front panel Status information ho...

Page 25: ...ogramming Gives remote operating information Chapter 5 Command Reference Gives details of programming commands Chapter 6 Specifications Provides full performance and environmental data Chapter 7 Installation Gives details for installation and maintenance Appendix A Performance Tests Provides procedures that verify the 5071A Primary Frequency Standard operate properly and meet electrical performanc...

Page 26: ... 1991 2 Standard Commands for Programmable Instruments SCPI Version 1991 0 May 1991 Available from SCPI Consortium Fred Bode Executive Director 8380 Hercules Drive Suite P3 La Mesa CA 91942 3 Characterization of Clocks and Oscillators NIST Technical Note 1337 March 1990 4 Application Note 1289 The Science of Timekeeping Agilent part number 5965 7984E Accessories Options and Specifications Informat...

Page 27: ...g of this manual may have a serial number prefix that is not listed on the title page These unlisted numbers indicate that the instrument is different from that documented in this manual The manual for this newer instrument is accompanied by a Manual Updating Changes supplement This supplement contains information that explains how to adapt the manual to the newer instrument In addition to change ...

Page 28: ...Preface xxvi Operating and Programming Manual ...

Page 29: ...____________________________________________ Chapter 1 Getting Started Getting Started ...

Page 30: ...er 1 Contents This chapter introduces you to the front panel interface menus and shows how to perform more complex time keeping tasks This chapter is organized as follows The 5071A at a Glance page 3 Rear Panel Connections page 7 Starting the 5071A page 8 Performing Basic Tasks page 10 ...

Page 31: ...ameters 2 Controls 5 DATA ENTRY FUNCTION KEYPAD selects six menu shortcuts and enters numeric data 6 ACTIONS KEYPAD controls Cursor menu choices data entry termination and display contrast Connectors 7 1PPS OUTPUT provides a 20 µs pulse every second for synchronization and timing 8 SYNC INPUT accepts a 100 ns to 100 µs pulse for synchronization of 1 PPS The electrical characteristics of these conn...

Page 32: ...Chapter 1 Getting Started The 5071A at a Glance 4 Operating and Programming Manual ...

Page 33: ...Chapter 1 Getting Started The 5071A at a Glance Operating and Programming Manual 5 ...

Page 34: ...Chapter 1 Getting Started The 5071A at a Glance 6 Operating and Programming Manual 48V OPTION REAR PANEL VIEW ...

Page 35: ...e 100 ns to 100 µs wide 2 to 10V into 50ΩTTL Threshold YES 10 19 20 114 7 Status Output Active Low BNC Female TTL Open Collector 1 6 kΩ pull up to 5V YES 90 102 8 Remote Data Transmission 9Pin Male D sub miniature RS 232C DTE Configuration YES 5 Chap 4 Chap 5 9 Internal Standby Battery Disconnect Switch Access N A Switch disconnects Internal Standby Battery NO 5 28 129 10 External dc Power 5 Pin C...

Page 36: ...sage Waiting for Stabilization may appear If so it could stay on for up to 20 minutes before the following messages appear a Warming up Indicates self test passed successfully b Setting Osc Control c Setting RF amplitude d Setting E_mult voltage e Logging signal levels f Setting C field g Locking servo loops h Operating normally 4 After about 15 minutes the Attention amber light goes out and the C...

Page 37: ...uration Output Ports RS 232C System Logs If the application requires a different configuration please refer to page 26 in this manual 1 entry remains Power source is BATT For 48V option 1 entry remains Lock completed Port1 5 MHz output Port2 10 MHz output Baud rate 2400 Data bits 8 Parity none Stop bits 1 Printer log disabled Error log cleared NOTE ...

Page 38: ... ns minimum to 100 µs maximum Rise time 50 ns The 1PPS output from a 5061A B or 5071A meets these sync pulse requirements As an alternative the 1pps may be manually synchronized see page 18 Synchronize the 5071A s 1pps Outputs to the reference source with the following procedure 1 Connect a 1pps sync pulse from the reference clock to the instrument s front or rear sync input 2 Press Top then once ...

Page 39: ...Enter the Modified Julian day3 with the numeric keys 4 Press Enter The new date is shown in the LCD display Always synchronize the 1pps pulse outputs before setting time and date otherwise the clock may display incorrect time date information Powering Down the 5071A When removing power from the 5071A you ll need to disable the internal standby battery Note 48V option does not have internal standby...

Page 40: ...Chapter 1 Getting Started Performing Basic Tasks 12 Operating and Programming Manual ...

Page 41: ...____________________________________________ Chapter 2 Using the 5071A Using the 5071A ...

Page 42: ...ng a page 18 Time Interval Counter To Set the Clock page 19 To Turn the Clock Display On or Off page 20 To Schedule a Leap Second page 20 Monitoring Status page 21 To Select Parameters page 21 To Interpret Displayed Results page 21 To Print a Status Report page 21 Reading and Managing the Event Log page 22 To Check Log Status page 22 To View Log Entries page 22 To Clear the Log page 22 To Print th...

Page 43: ...ogramming Manual 15 Configuring the 5071A page 26 To Set the Operating Mode page 26 To Set the Printer Log Mode page 26 To Set Up the Serial Port page 27 To Save a Configuration page 27 Connecting a Printer page 27 Disabling the Internal Standby Battery page 28 ...

Page 44: ... up the menu tree 4 Use the Enter key to select a menu choice or trigger an action Refer to page 3 for the available menus display icons and conventions Controlling the 5071A From the Front Panel You can customize the 5071A s operation by performing a number of tasks after the instrument is running normally see page 10 When you ve completed most of these tasks no further operator intervention will...

Page 45: ...dure to set the output frequencies at rear panel ports 1 and 2 to either 5 or 10 MHz When the frequency of a port is changed and then returned to the previous frequency the original phase is restored 1 Select the CONFIG menu then press Enter 2 Select OUTPUTS then press Enter 3 Choose Port 1 or Port 2 then press Inc or Dec to set frequency NOTE ...

Page 46: ...nous and isolated from one another Changes made to the 1pps output signal timing have no effect on the 10 5 1 or 0 1 MHz output signals To Synchronize the 1pps Outputs Using a Time Interval Counter You can manually synchronize the 1pps outputs with another frequency standard or system 50 ns if a Sync input signal is not available as described in Chapter 1 A high resolution TI counter should be use...

Page 47: ...c keys See the MJD information below and Table 2 1 4 Press Enter The new date is shown in the LCD display _________________________ 1 You can use the Inc Dec keys to make small adjustments Table 2 1 Modified Julian Days The Modified Julian Day MJD During the course of configuring and using the 5071A you ll have occasion to set the date The 5071A uses the MJD to date log entries as well as tagging ...

Page 48: ...lect LEAPSEC press Enter enter the effective date MJD and press Enter This is the MJD on which the change is to occur at 23 59 59 3 Select the next field by Pressing the key 4 Press Inc or Dec to choose 59 or 61 depending on whether a leap second is to be added or subtracted Display shows Leap second is pending The leap second will occur as desired without further input When the desired MJD has ar...

Page 49: ... parameter operating ranges and definitions Table 2 2 Internal Operating Parameters Parameter Description Typical Range Pump Ion pump current 0 40 µA Ovens Cesium beam tube and VCXO Oven monitor 0 to 10V and 5 to 10V Ctrl VCXO control voltage 95 to 95 C Field C field control current 10 0 to 14 05 mA Ampl Microwave signal strength for CBT of maximum 0 to 100 and 0 to 100 E_Mult CBT electron multipl...

Page 50: ...e in the event log 1 Select the LOG menu then press Enter 2 Select STATUS The number of log entries is displayed To View Log Entries Use the following procedure to read event log entries 1 Select the LOG menu then press Enter 2 Select BROWSE then press Inc or Dec as needed to read the entries To Clear the Log This procedure clears the entire log Cleared entries cannot be recovered 1 Select the LOG...

Page 51: ...Simply Steer the output frequency for a suitable length of time The resolution unit of the STEER function is 6 331991 10 15 and the range of the fractional frequency offset is 999999 10 15 When you STEER the instrument s output frequency you must take into account the exact amount of the offset to establish and maintain traceability and accuracy The frequencies of the sinusoidal outputs and the ra...

Page 52: ...ue you have previously entered is no longer in effect You will need to re enter the steering value as part of the reset procedure To Check an Offset Use the following procedure to determine the value of an active offset 1 Select the STEER menu then press Enter The LCD display shows the current offset value with an accuracy of 1 x 10 15 2 Leave the active menu by pressing Prev To Remove an Offset 1...

Page 53: ...procedure 1 Press Shift then 5 UTILITIES the LCD display shows RESET selected 2 Press Enter The Continuous Operation light is now continuously lit To Reset the Rear Panel Status Output 1 Select the UTIL menu then press Enter 2 Select CLEAR then press Enter Resetting the Status Output results in a high logic state when the instrument is operating normally To Display the Firmware Revision or CBT Ide...

Page 54: ...initiates the normal CBT power up sequence 1 Select the CONFIG menu then press Enter 2 Select MODE then press Enter Use the or keys to select NORMAL or STANDBY then press Enter To Set the Printer Log Mode The internal event log can report several different levels of information to the instrument s rear panel RS 232C serial port when a printer has been connected to the instrument and correctly conf...

Page 55: ...Inc or Dec as needed to adjust each parameter value To Save a Configuration Use this procedure to save the selected configuration choices into non volatile memory 1 Select the CONFIG menu then press Enter 2 Select STORE then press Enter This stores the Display angle Output frequencies Serial port settings and Log mode in non volatile memory Connecting a Printer You can connect a printer to the 507...

Page 56: ...peated partial charge and discharge cycles can permanently damage the battery s storage capacity Refer to Chapter 7 Internal Standby Battery Maintenance and Battery Charging for more information If your situation requires you to operate the 5071A under these conditions it is strongly recommended that the internal batteries be manually disconnected each time power is removed or permanently disconne...

Page 57: ...____________________________________________ Chapter 3 In Case of Difficulty In Case of Difficulty ...

Page 58: ...Display page 31 Attention Light page 31 Continuous Operation Light page 31 LCD Display page 32 Instrument States page 33 Front Panel Warning Messages page 34 Power up Problems page 35 Using Menus to Check Operational Status page 36 INFOrmation Menu page 36 LOG Menu page 36 UTILities Menu page 36 CLOCK Menu page 36 CONFIGuration Menu page 36 Operating System Failure page 37 Operating System Failure...

Page 59: ...on Status display read from the LCD display will tell you why See page 21 Monitoring Status for more information Flashes when the instrument is approaching or has entered a failure mode See Instrument States next page for more information View the Event Log for more detailed information Refer to the front panel Quick Reference Guide to Controls or Chapter 2 of this manual to read the Event Log Con...

Page 60: ...ted Fatal Error See Fatal Error instrument state below Warm up or Standby Mode See Front panel Message Flashing Ready to set Continuous Operation Continuous Operation NOT Set Running on battery Continuous Operation Not Set Steered Output Continuous Operation NOT Set ON Normal Operation Continuous Operation Set Normal Operation with Battery Power or Warning state See Warning Instrument state below ...

Page 61: ...ument then attempts to auto lock its servo loops If successful the next state is Normal operation If there is a failure the next state is Fatal error see below 3 Normal Operation Runs internal software continuously to check and adjust the instrument s operation The Continuous Operation light flashes and the user may reset continuous operation at this point Transition to a Warning state occurs when...

Page 62: ...the screen You attempt schedule a leap second but when you press Enter the instrument beeps and displays Remote Mode front panel locked out Press any key to continue Standby Mode The 5071A is in Normal mode You attempt to run the diagnostic self tests but when you press Enter the instrument beeps and displays Valid only when in standby Press any key to continue Steered Operation The 5071A is warmi...

Page 63: ...r is present 3 Replace the fuse as needed then attempt restart 4 If the fuse blows again disconnect power immediately and contact the nearest Symmetricom Customer Service Center for assistance If you attempt to start the 5071A when its temperature is below 0 Centigrade the allotted maximum 45 minute power up warm up time may not be sufficient to heat both the Cesium Beam tube oven and VCXO oven 1 ...

Page 64: ...lues of the instrument s internal operating parameters LOG Menu Use the LOG menu to check Instrument s most recent operating history and to Print a copy of the current log contents UTILities Menu Use the UTIL Utilities menu to Check the firmware revision and View CBT Identification string and Clear reset the rear panel Status Output CLOCK Menu Use the CLOCK menu to check the Active clock time and ...

Page 65: ...display update or changes to the instrument s rear panel output functions Refer to the restart procedure Unresponsive Rear Panel RS 232C Serial Port Attempts to issue commands through a correctly configured rear panel RS 232C serial port fail to cause any remote terminal display update and or changes to the instrument s rear panel output functions Refer to the restart procedure Restarting the 5071...

Page 66: ...s Operation light may extinguish for no discernible reason but can be reset momentarily after any warnings have cleared If these symptoms occur 1 Select the front panel INFOrmation menu then press Enter 2 Check the E_Mult parameter for an excessive increased or decreased value See Table 2 2 on page 21 for typical values 3 Check the Gain parameter for an excessive increase in value See Table 2 2 on...

Page 67: ...____________________________________________ Chapter 4 Remote Operation and Programming Remote Operation and Programming ...

Page 68: ... a Terminal page 47 Programming Overview page 48 SCPI Command Conformance page 49 Command Types page 50 Common Command Format page 50 SCPI Command and Query Format page 50 RST Reset Response page 54 Sample Program Commands page 55 Status Monitoring Tasks page 56 Instrument Control Tasks page 57 Batch Processing for the Program Commands page 59 Command Scripts On a Personal Computer page 59 SCPI Co...

Page 69: ... operator for controlling computer and the 5071A These features are discussed as they occur for hardware setup in this section and later for software beginning with the Programming Overview section in this chapter and command reference information in Chapter 5 Serial Port Description The 5071A s serial port is a DTE device that may be connected to a printer terminal computer or modem The available...

Page 70: ...2C standard The serial port connections are electrically isolated from the 5071A s ground and circuitry The serial port pin assignments are listed below See Figure 4 1 for the different RS 232C cabling connection setups Use the appropriate setup that meets the remote operation needs Pin Function 1 Not connected 2 Received data To 5071A 3 Transmitted data From 5071A 4 Not connected 5 Signal Ground ...

Page 71: ...Chapter 4 Remote Operation and Programming Remote Operation Setup Operating and Programming Manual 43 Figure 4 1 RS 232C Cabling Setups ...

Page 72: ... s serial port are 1 In Windows NT or Windows 95 main window click the Start button then select Programs 2 Select Accessories Hyperterminal and Hyper Terminal The Connection Description dialog box is displayed 3 In the Name window type 5071A for example select one of the icons the first one will do then click OK The Connect To dialog box is displayed 4 In the Connect using window select the approp...

Page 73: ...he command you want to send For commands that produce a response the reply will appear on screen For example sending idn asks the instrument to identify itself The transaction might look something like this scpi idn SYMMETRICOM 5071A US48051234 4805 scpi After you ve selected the communication parameters for the terminal be sure to configure the 5071A s serial port with the same values using the C...

Page 74: ...d to connect the instrument directly to public telephone lines there exists the possibility of accidental or intentional interference with the instruments operation Since the instruments communication protocol does not provide password protection connection via a computer or suitably programmed dial back modem is preferable Modem Selection The modem used to control the 5071A must be capable of ope...

Page 75: ...t connection over telephone lines is required a dedicated line or computer implemented password protection is strongly advised Verifying Remote Operation with a Terminal Use the following steps to verify proper operation of the data communications link between the 5071A and remote terminal 1 Ensure that the correct hardware connections exist between the 5071A and the terminal as shown on page 43 2...

Page 76: ...ing command format syntax and RST response initialization state After reading this section you will have a basic knowledge of how to use and understand the SCPI commands for the 5071A Primary Frequency Standard The details of the 5071A s SCPI and IEEE Common Commands appear in the next chapter and include summary tables that describe all command subsystems syntax parameter ranges values and respon...

Page 77: ...d Version 1990 0 The instruments SCPI command set consists of the following Common Commands as defined in IEEE 488 2 1987 Subsystem commands as confirmed and listed in the SCPI standard These are commands defined in table 5 2 as Std Subsystem commands designated for the instrument in conformance with SCPI standards but not yet listed in the SCPI standard These are the commands defined in table 5 2...

Page 78: ...rated from the first parameter by a space character Some examples of common commands are RST ESR IDN SCPI Command and Query Format SCPI commands perform functions like instrument setup synchronization adjusting epoch and reporting instrument specific operating parameters A subsystem command structure is a hierarchical structure that usually consists of a top level or root command one or more lower...

Page 79: ... Implied Channel Some commands contain channel numbers in square brackets 1 2 The brackets indicate that the same programming sequence can be used for both channels one of which must be specified If a channel number is not specified it will default to 1 Implied Commands Implied commands appear in square brackets in the command syntax The brackets are not part of the command and are not sent to the...

Page 80: ...nclude MIN and MAX as follows MIN selects the minimum value available and MAX selects the maximum value available Queries on MIN or MAX return the associated value All decimal types also accept MIN or MAX and can be queried with them to produce a numeric value Boolean Represents a single binary condition that is either true or false 1 or ON 0 or OFF Discrete Selects from a finite number of choices...

Page 81: ...rameter the command returns the minimum usable value If you send the MAX parameter the command returns the largest MJDate usable value Be sure to place a space between the command and the parameter Linking Commands To link IEEE 488 2 Common Commands with SCPI commands on the same line use a semicolon between the commands For example RST DIAG CONT RES Multiple SCPI commands with corresponding param...

Page 82: ...le 4 2 summarizes this state Once a configuration has been saved it will persist even if power is removed or until it is reprogrammed via SCPI commands or through the front panel menus Table 4 2 RST Reset Conditions Subsystem Command Parameter State DIAGnostic LOG VERBosity DISable DISPlay ENABle ON SOURce PTIMe SYNC OFF SOURce ROSCillator STEer 0 0 SYSTem REMote ON The IEEE 488 2 RST command retu...

Page 83: ...isted to the right of the corresponding program lines You can use these function explanations to customize control programs for your own special needs The example programs are written with SCPI short form notation The full names options and parameters for these commands are contained in the SCPI Command Tree Summary in Chapter 5 of this manual A complete list of 5071A error messages including code...

Page 84: ...ort MJD 48587 21 03 42 CBT ID 6 temp Status summary Operating normally Power source AC Log status Empty Freq Offset 0e 15 Osc control 1 67 RF amplitude 1 20 2 RF amplitude 2 19 9 Zeeman Freq 39949 Hz C field curr 12 137 mA E multiplier 1870 V Signal Gain 28 8 CBT Oven 6 2 V BT Oven Err 0 00 C Osc Oven 8 8 V Ion Pump 0 2 µA HW Ionizer 1 0 V Mass spec 9 1 V SAW Tuning 3 5 V DRO Tuning 6 8 V 87MHz PL...

Page 85: ...ng normally scpi SYST REM ON Command the 5071A to enter Remote mode DIAG CONT RESET Set Reset the Continuous Operation light on scpi the front panel SOUR ROSC FREQ1 5 0E 6 Set Port 1 output to 5 MHz scpi SOUR ROSC FREQ2 1 0E 7 Set Port 2 output to 10 MHz scpi SYST SCON Save this configuration in memory scpi Example Program 2 Synchronization and Time Date Setup Program Dialog Task Function SOUR PTI...

Page 86: ... leap second scpi SOUR PTIM LEAP DUR 59 Set time show minute scpi SOUR PTIM LEAP ON Enable Leap second insertion scpi Example Program 4 Steering the Outputs Program Dialog Task Function SOUR ROSC STE 1 23E 13 Steer all outputs with a fractional scpi offset of 1 23 x 10 13 Example Program 5 Slewing the Clock Program Dialog Task Function SOUR PTIM SLEW 0 5 Adjust epoch add one half second scpi ...

Page 87: ...l emulator program that supports scripting batch file execution over a data communications line such as Agilent s AdvanceLink for Windows The following procedure applies specifically to AdvanceLink for Windows and may also provide a generic plan useful with other popular Data Communications software for your Personal Computer 1 Use an ASCII text editor to type in and name one of the example progra...

Page 88: ... with suitable characters Following the execution of any command the instrument outputs a prompt sequence indicating that it is ready for more commands The prompt sequence indicates whether an operational or communication error has occurred while attempting to execute the command The error prompt is removed by reading the error If the command sent to the instrument generates a response the respons...

Page 89: ... a printer the 5071A has an operating mode that automatically sends operational or warning messages out the serial port to a printer or terminal These unprompted messages may be inconvenient when the instrument is controlled by a computer and can be suppressed with the DIAG LOG VERB DISABLE command line The messages can then be obtained from the instruments non volatile log on demand NOTE ...

Page 90: ...ransEra Corporation 1 5071A Manual Example Rev 9 13 06 2 3 4 5 CLEAR SCREEN 6 7 INTEGER Baud 8 DIM Return 80 9 10 COM Io Prompt 4 Term 1 Ser_in Ser_out Timeout INTEGER Com_port 11 12 Prompt scpi 13 Term 14 Timeout 2 15 16 17 Set up serial port 18 Com_port 9 Serial A Com 1 19 Baud 9600 20 21 Return FNConfig_ser_port Com_port Baud 22 PRINT Return 23 24 ASSIGN Ser_in TO Com_port FORMAT ON 25 ASSIGN S...

Page 91: ...aud 8 None 68 69 Err_trap 70 RETURN ERRM 71 FNEND 72 73 74 75 DEF FNTalker Output 76 This function sends a command or query to the 5071A then retrieves 77 the 5071A response 78 79 COM Io Prompt 4 Term 1 Ser_in Ser_out Timeout INTEGER Com_port 80 81 DIM Input 2048 A 1 Reply 2048 82 83 ON DELAY Timeout 15 GOTO Hang 15 is highest priority 84 85 Chars_in_queue READIO Com_port 31 86 87 WHILE Chars_in_q...

Page 92: ...al port 118 119 Exit 120 OFF DELAY 121 RETURN Reply 122 FNEND 123 124 125 Program Output The program output is shown below Notice that the 5071A echoes the commands or queries it receives After echoing a command it returns a prompt After echoing a query it returns the result of the query and a prompt Serial interface at Select Code 9 set up 9600 8 None CLS scpi SYST REM ON scpi DISP ENAB ON scpi P...

Page 93: ...how best to clear them Keypad Lock Ups Why do they occur and how are they cleared Description First make sure the padlock symbol does not appear in the LCD display If so the 5071A is locked via the SCPI command SYST REM ON and must be unlocked before some front panel operations can be accepted Refer to this manual for instructions on how to unlock the front panel If this is not the case the 5071A ...

Page 94: ...able ensure that the terminals Baud Rate Parity Data Bits and Stop Bits are consistent with the 5071A then send a Control Q from the terminal keyboard This should result in the remaining data from the 5071A being sent to the terminal and thereby clear the problem DSR The DSR signal acts exactly like the XON XOFF protocol but instead of being implemented in software it is done in hardware The DSR l...

Page 95: ...the Option 300 Front panel All 5071A instruments are shipped with a CD ROM that contains Serial Port Configuration software The installation software is located at 5071A Serial Port Configuration Management Software Installer Volume setup exe Double click on the setup icon to install the software Accept all default folder names and license agreements When the installation is complete an icon will ...

Page 96: ...in any PC with an RS 232 COM port connected to the 5071A as described in this manual If you cannot locate the CD or need a copy of the program you can download it from our website at http www Symmetricom com Alternatively you can contact your local Symmetricom Sales Office via E Mail or phone and request a copy to be sent to you via E Mail ...

Page 97: ...____________________________________________ Chapter 5 Command Reference Command Reference ...

Page 98: ...ands page 78 Diagnostic Commands page 78 Display Commands page 84 Precision Time Date and Time Commands page 85 Reference Oscillator Commands page 88 STATus Monitoring Commands page 90 System Commands page 95 Status Reporting page 99 Rear Panel Status Output Operation page 102 Status Output Programming page 102 Example 1 Programming the Status Output for a Single True Condition page 103 Example 2 ...

Page 99: ...s but not yet listed in the SCPI Standard These are the commands defined in Table 5 2 as New The IEEE 488 2 commands are summarized first Table 5 1 followed by SCPI commands Table 5 2 Details of all 5071A SCPI commands can be found in the SCPI Subsystem Commands section following the SCPI Command summary The SCPI command format syntax parameter and response types and Common command formats are exp...

Page 100: ...e Register contents ESR Event Status Register Query Returns Event Status Register Contents IDN Identification Query Returns Instrument identification string OPC Operation Complete accepted but ignored OPC Operation Complete Query always returns 1 RST Reset Reset See RST Response Table 4 2 SRE Service Request Enable Set service request enable register SRE SRE Query Returns contents of SRE register ...

Page 101: ... ion pump current DIAGnostic GAIN NR3 Returns signal gain DIAGnostic LOG CLEar Clears log entries DIAGnostic LOG COUNt NR1 Returns number of log entries DIAGnostic LOG PRINt string Prints log entries DIAGnostic LOG READ numeric_value string string Returns log entry DIAGnostic LOG VERBosity DISable TERSe VERBose SERVice Selects printer log report detail DIAGnostic LOG VERBosity DIS TERS VERB SERV R...

Page 102: ... AND TIME COMMANDS SOURce PTIMe TIME hour minute second Sets 24 hour time SOURce PTIMe TIME MIN MAX MIN MAX MIN MAX NR1 NR1 NR1 Returns 24 hour time SOURce PTIMe MJDate numeric_value Sets modified Julian date MJD SOURce PTIMe MJDate MIN MAX NR1 Returns the MJD SOURce PTIMe LEAPsecond DURation numeric_value Sets Leap second minute duration SOURce PTIMe LEAPsecond DURation MIN MAX NR1 Returns Leap s...

Page 103: ... Sets fractional frequency offset SOURce ROSCillator STEer MIN MAX NR3 Returns set fractional frequency offset SOURce ROSCillator FREQuency 1 2 frequency Sets selected Output port Hz SOURce ROSCillator FREQuency 1 2 MIN MAX NR3 Returns Output port Hz SOURce ROSCillator MVOLtage NR3 Returns OSC oven monitor voltage STATUS MONITORING COMMANDS STATus OPERation EVENt NR1 Returns clears OEReg contents ...

Page 104: ...ATus QUEStionable PTRansition numeric_value Sets PTRReg to specified value STATus QUEStionable PTRansition NR1 Returns PTRReg contents STATus PRESet Resets Control Registers clears Status Output SYSTEM COMMANDS SYSTem ERRor NR1 string Returns error numbers messages SYSTem KEY numeric_value Inserts keycode in keypress queue SYSTem KEY MIN MAX NR1 Returns last keypress code SYSTem PRINt ASCII_string...

Page 105: ...te SYSTem COMMunicate SERial BITS numeric value 7 or 8 Sets number of data bits SYSTem COMMunicate SERial PARity NONE EVEN ODD Sets parity SYSTem COMMunicate SERial SBITs numeric value 1 or 2 Sets number of stop bits SYSTem COMMunicate SERial BAUD NR1 Returns baud rate SYSTem COMMunicate SERial BITS NR1 Returns number of data bits SYSTem COMMunicate SERial PARity NONE EVEN ODD Returns parity SYSTe...

Page 106: ... string quoted DIAGnostic CONTinuous RESet This command resets the Continuous Operation light illuminates continuously if the instrument has triggered its warning mode The 5071A must be in REMote mode to execute this command If DIAG CONT is OFF sending CONT RESet will generate error 202 Valid only when operating normally The function of this command is not affected by RST If the instrument s state...

Page 107: ... NR3 precision 1 x 10 3 DIAGnostic LOG CLEar This command purges all event log entries The 5071A must be in REMote mode to execute this command This command is not affected by RST and does not have a query DIAGnostic LOG COUNt This query returns the number of entries in the log as an integer If the log has been deleted this query returns a negative value Response format NR1 DIAGnostic LOG PRINt Th...

Page 108: ...e content The VERBosity setting has no effect on which messages are saved in non volatile log It only specifies which messages echo to the serial port unrequested DIAGnostic LOG VERBosity This query reports the active setting for log verbosity Return values DIS TERS VERB or SERV discussed above DIAGnostic RFAMplitude This query returns RF Attenuator setpoints as fraction of full scale Response for...

Page 109: ...format boolean 0 tests passed or 1 tests failed The available test parameters and corresponding functions are 1 Execute tests 0 through 17 0 Cbt board register test 1 Cbt board thermistor window test 2 Cbt board thermistor test 3 Cbt board Cesium oven test 4 Cbt board hot wire ionizer test 5 Cbt board mass spectrometer test 6 Cpu board RTDS test 7 Cpu board phase lock loop test 8 DDFS board regist...

Page 110: ...oint Response format NR3 precision 1 x 10 1 V DIAGnostic VOLTage MSPec This query returns the mass spectrometer voltage setpoint Response format NR3 precision 1 x 10 1 V DIAGnostic VOLTage PLLoop This query returns tuning voltages for each of four phase locked loops 9 2 GHz 640 MHz 87 MHz 9 MHz Response format NR3 NR3 NR3 NR3 precision 1 x 10 1 V DIAGnostic VOLTage ROSCillator This query is equiva...

Page 111: ... The display will illuminate if the time has been set The 5071A must be in REMote mode to execute this command REMote mode can be set ON by sending RST The available parameters are OFF 0 turns the display OFF or ON 1 turns the display ON DISPlay ENABle This query returns the LED clock display status as ON or OFF see above The clock display is ON if enabled and time has been set Response format 0 o...

Page 112: ...ard The 5071A must be in REMote mode to execute this command Requires three parameters hours minute and second Entered values are rounded to integer The maximum range limits are 23 59 59 respectively The function of this command is not affected by RST PTIMe TIME MIN MAX MIN MAX MIN MAX This query returns time in 24 hour format SCPI Std as hours minute second or minimum maximum range limit values R...

Page 113: ...e LEAPsecond DURation MIN MAX This query indicates the duration of the minute preceding a pending leap second or minimum maximum range limit values If none is pending the last specified value for DURation returns PTIMe LEAPsecond MJDate numeric_value This command programs the MJD for a scheduled leap second with the supplied parameter One parameter is required MJD range 0 to 99999 If no Leap secon...

Page 114: ..._value This command adjusts the epoch of the clock with the supplied parameter The 5071A must be in REMote mode to execute this command One parameter is required accepts S suffix Parameter range 0 5 S to 0 5 S precision 50 ns This is an event The function of this command is not affected by RST PTIMe SLEW MIN MAX This query returns the smallest and largest slew value which can be used Response form...

Page 115: ...e this command Arming terminates when canceled from the command interface a valid sync pulse is received at the armed port or after 1 1 2 seconds has elapsed Examine the relative timing of the pulses to determine which event has occurred The function of this command is OFF at RST The available parameters are OFF Turns off either Front or Rear Sync Input port connectors FRONt enables the Front pane...

Page 116: ...ed parameter The 5071A must be in REMote mode to execute this command This command requires that PTIMe STANdby is ON for successful completion otherwise the command is ignored Precision of control one part in 32767 Range 3 3 x 10 7 in frequency ROSCillator CONTrol MIN MAX This query returns the reference oscillator frequency control setpoint as a signed fraction of full scale or minimum maximum ac...

Page 117: ...icated port with the supplied parameter The 5071A must be in REMote mode to execute this command The frequency parameter is 5 x 106 or 10 x 106 Hz Values are rounded to the nearest valid setting unless out of range The function of this command is not affected by RST ROSCillator FREQuency 1 2 MIN MAX This query returns the programmed frequency at specified port in Hz or minimum maximum acceptable r...

Page 118: ...d Operation Status register and the Questionable Data register These registers may be set and queried Parameter Entry Parameter entry for both registers is numeric only Numeric types may be Decimal Hexadecimal Octal or Binary The decimal numeric range is between 0 and 32767 The RST value is 0 Sending a decimal value of 64 will set bit 6 Bit Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Decimal Valu...

Page 119: ...Chapter 5 Command Reference Description of SCPI Commands Operating and Programming Manual 91 ...

Page 120: ...ion ENABle numeric_value This command sets the OPERation enable register to the specified value Meaningful values are in the range 0 to 32767 STATus OPERation ENABle This query reports OPERation enable register contents non destructively Response format NR1 STATus OPERation NTRansition numeric_value This command sets the negative transition filter fall register as specified Meaningful values are i...

Page 121: ... monitor these registers The STATus QUEStionable subsystem commands query the QUEStionable Register to indicate whether an overflow has occurred for a specific function after an associated command has executed When any of the bits are set questionable data bit 3 of the Status Register is set to 1 if enabled by the STAT QUES ENAB command STATus QUEStionable EVENt This query reports contents of the ...

Page 122: ...d Meaningful values are in the range 0 to 32767 STATus QUEStionable NTRansition This query reports the contents of the fall register Response format NR1 STATus QUEStionable PTRansition numeric_value This command sets the positive transition filter rise register as specified Meaningful values are in the range 0 to 32767 STATus QUEStionable PTRansition This query reports the contents of the rise reg...

Page 123: ...en an error occurs within the instrument its corresponding number and message are generated and stored in the error queue One error is removed from the error queue each time the SYSTem ERRor command is executed The errors are cleared in a first in first out order This means that if several errors are waiting in the queue each SYSTem ERRor query returns the oldest not the most recent error That err...

Page 124: ...t right top bottom order Add 128 to any keycode to arrive at its shifted code Codes 20 128 and 149 are reserved See the key code listing the following table Key Code Shifted Key Code Shift OFF 0 INFO 129 Data 7 1 SET CLOCK 130 Data 8 2 SLEW 131 Data 9 3 132 4 133 5 SERIAL 134 Data 4 6 UTILITIES 135 Data 5 7 LOG 136 Data 6 8 Inc 137 Inc 9 Dec 138 Dec 10 Data 1 139 Data 1 11 Data 2 140 Data 2 12 Dat...

Page 125: ...f this command is ON at RST SYSTem REMote This query returns the state of REMOTE mode Response format 0 or 1 Returns 1 if REMOTE mode is ON 0 if REMOTE mode is OFF SYSTem SCONfiguration This command saves the following instrument parameters in nonvolatile memory Serial port baud rate data bits stop bits and parity LCD angle Output port frequencies Printer report level The 5071A must be in REMote m...

Page 126: ...lues 7 or 8 SYSTem COMMunicate SERial PARity NONE EVEN ODD This command sets RS 232C parity Input values None Even or Odd SYSTem COMMunicate SERial SBITs numeric_value This command sets RS 232C number of stop bits Input values 1 or 2 SYSTem COMMunicate SERial BAUD This query returns the RS 232C baud rate Response format NR1 SYSTem COMMunicate SERial BITS This query returns the RS 232C number of da...

Page 127: ...utput goes active can be programmed with the commands available in the SCPI STATus subsystem These commands are used in conjunction with IEEE 488 2 Common commands Refer to the next section of this chapter for information about and examples of programmed rear panel Status Output states The status registers of the 5071A are defined in tables 5 3 5 4 5 5 and 5 6 as follows Table 5 3 IEEE Summary Sta...

Page 128: ... Bit Status 0 CALibrating Set when performing auto calibration 1 SETTling always zero 2 RANGing always zero 3 SWEeping always zero 4 MEASuring always zero 5 awaiting TRIG always zero 6 awaiting ARM always zero 7 CORRecting always zero 8 Standby Set when in standby state 9 On Battery Set when power source is internal battery this will always be 0 for 48V option instruments 10 Normal Set when operat...

Page 129: ...ion cleared when clock is set 3 POWer always zero 4 TEMPerature always zero 5 FREQuency Indicates out of lock condition see log 6 PHASe Indicates spurious bursts from servo chain 7 MODulation always zero 8 CALibration always zero 9 unassigned always zero 10 unassigned always zero 11 unassigned always zero 12 unassigned always zero 13 INST summary always zero 14 Command Warning always zero 15 Unuse...

Page 130: ...071A will assert its status output active when the instrument leaves normal operation This exit from normal operation may be programmed for a variety of conditions Two example conditions are described below The SCPI STATus PRESet command restores the control registers to SCPI required values Status Output Programming Programming the rear panel Status Output consists of eight general steps Examples...

Page 131: ...d entries are STAT OPER ENAB 512 STAT OPER PTR 512 STAT OPER NTR 0 Be aware that even though no false conditions are programmed the Negative transition command must however be programmed for zero You may at any time set the rise and clear the fall registers of the OPERation and QUEStionable subsystems by issuing the STATus PRESet command Example 2 Programming the Status Output for Multiple True an...

Page 132: ...R NTR command The resulting SCPI command entries are STAT OPER ENAB 7937 STAT OPER PTR 6913 STAT OPER NTR 1024 You may at any time set the rise and clear the fall registers of the OPERation and QUEStionable subsystems by issuing the STATus PRESet command Although these examples used the OPERation register functions you can also use the QUEStionable register functions that are available for questio...

Page 133: ...DSR input of the serial port is pulled up by a resistor so that it is transparent if not connected Many RS 232C printers support this pacing arrangement Some also support XON XOFF XON XOFF is also useful when using a terminal XOFF is the same as control S while XON is control Q The Prompt The SCPI program parser prints a prompt whenever ready for another command If no errors are in the queue the p...

Page 134: ...ned header Command header incorrectly specified 121 Invalid character in number Entered character for numeric data is incorrect 123 Exponent too large Exponent larger than 32000 124 Too many digits More than 256 digits specified 128 Numeric data not allowed Number specified for parameter not letter 131 Invalid suffix Parameter suffix incorrectly specified 134 Suffix too long The suffix contained m...

Page 135: ...pecified parameter value too large small 223 Too much data Excess data for memory device specific process requirements 224 Illegal parameter value Specified numeric value not allowed 230 Data corrupt or stale New function started but not completed since last access 231 Data questionable Output data accuracy is suspect 300 Device specific error This is the generic device dependent error 310 System ...

Page 136: ...Chapter 5 Command Reference Error Messages Codes 108 Operating and Programming Manual ...

Page 137: ...____________________________________________ Chapter 6 Specifications Specifications ...

Page 138: ...are intended to provide information useful to apply the instrument by giving typical or nominal but non warranted performance parameters All references to internal standby battery power battery status or battery operation do not apply for 5071A 48V option Chapter Summary Accuracy and Stability Page 111 Frequency Stability 5 and 10 MHz outputs Page 112 Sinusoidal Output Characteristics Page 112 Sup...

Page 139: ...rmance Cesium Beam Tube Accuracy 1 x 10 12 5 x 10 13 Frequency Change vs Environment 1 x 10 13 8 x 10 14 Warm up Time To normal operation status typical To full specifications typical 15 minutes 30 minutes 15 minutes 30 minutes Reproducibility 1 0 x 10 13 1 0 x 10 13 Long term Stability Time domain Stability Averaging Time 5 and 10 MHz outputs 104 seconds 105 seconds 5 days 30 days 2 7 x 10 13 8 5...

Page 140: ... 156 102 2 7 x 10 12 8 5 x 10 13 10K 154 160 103 8 5 x 10 13 2 7 x 10 13 100K 154 160 104 2 7 x 10 13 8 5 x 10 14 105 8 5 x 10 14 2 7 x 10 14 5 days 5 0 x 10 14 1 0 x 10 14 5 MHz phase noise is expected theoretical performance Sinusoidal output characteristics all located on rear panel Parameter Ports 1 2 1 1 MHz 100 kHz Amplitude into 50 load 1 Vrms 1 Vrms Isolation between ports 110 dB typ not s...

Page 141: ...uration Provides complete remote control and interrogation of all instrument functions and parameters RS 232C interface circuits are optically isolated and floating with respect to 5071A chassis Software command set Standard commands for Programmable Instruments SCPI version 1990 0 adapted for RS 232C Connector 9 pin male rectangular D Subminiature type Status Output Provides a logic output to mon...

Page 142: ...rear panel RS 232 serial port 046 This option removes the internal 45 minute standby batteries The 5071A will only operate on ac mains or external nominal 24 Vdc power This option is not compatible with 48V option 048 This option equips the frequency standard to operate from 48 Vdc nominal power The range that the frequency standard will accept is 40 58 Vdc Maximum dc power consumption is 100W Two...

Page 143: ...e Describes the spectral noise in the specified output signal caused by phase modulation from internal noise sources The measurement is normalized by expressing the ratio of noise power in a 1 Hz bandwidth to the signal power then measured as a function of offset from that signal For more information see NIST Technical Note 1337 Characterization of Clocks and Oscillators available from the Superin...

Page 144: ...e y is the standard deviation 2 means that measurements are taken in pairs and is the measurement time In the 5071A specifications values for all averaging times are shown in one chart for convenience However short term stability specifications for averaging times in excess of 1000 seconds are valid only under laboratory conditions temperature 25 5 C relative humidity 45 10 For more information on...

Page 145: ...____________________________________________ Chapter 7 Installation Installation ...

Page 146: ...age 122 Operating Environment page 123 Bench Operation page 123 Installing Options 908 and 913 page 123 Returning the 5071A to Symmetricom page 124 Operator s Maintenance page 126 Operating the 5071A From External DC Power page 126 Preparing the 5071A For External DC Operation page 127 Replacing the External DC Input Power Fuse page 128 Internal Standby Battery Maintenance page 129 Battery Shelf L...

Page 147: ... the instrument or some component fails operational verification or full performance test notify the nearest Symmetricom office If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Symmetricom office Keep the shipping materials for the carrier s inspection The Symmetricom office will arrange for repair or replacement at Symmetricom...

Page 148: ...e details and the section in this chapter that explains auxiliary dc power operation For 48 VDC option the external dc voltages between 40 and 58 VDC is required Maximum dc power consumption is 100 W THIS IS A SAFETY CLASS I PRODUCT PROVIDED WITH A PROTECTIVE EARTH TERMINAL AN UNINTERRUPTIBLE SAFETY EARTH GROUND MUST BE PROVIDED FROM THE MAINS POWER SOURCE TO THE PRODUCT INPUT WIRING TERMINALS POW...

Page 149: ... wheel in the module The correct value fuse with a 250 volt rating must be installed before the turret wheel is inserted This instrument uses a 1 5A slow blow fuse part number 2110 0304 for 100 120 volt operation and a 0 75A slow blow fuse part number 2110 0360 for 200 240 volt operation To change the line voltage first disconnect the ac power cord from the module and then follow the instructions ...

Page 150: ...0V 8120 1689 8120 1692 7 2 Straight CEE7 Y11 90 79 79 Mint Gray Mint Gray East and West Europe Egypt Unpolarized in many nations 125V 8120 1348 8120 1389 8120 1754 45 00222 8120 1521 8120 1676 8120 4753 5 5 7 1 6 1 3 Straight NEMA5 15P 90 Straight NEMA5 15P Straight NEMA5 15P 90 Straight NEMA5 15P Straight NEMA5 15P 80 80 36 80 80 30 90 Black Black Black Black Jade Gray Jade Gray Dark Gray United ...

Page 151: ...rovides the hardware necessary to mount the 5071A in a standard rack with flanges and handles WHEN INSTALLING THE 5071A IN AN INSTRUMENT RACK WITH EITHER OPTION 908 OR 913 YOU MUST USE EITHER AN INSTRUMENT SUPPORT TRAY OR SLIDE MOUNT RAILS ON THE INSIDE OF THE INSTRUMENT RACK FAILURE TO DO SO WILL RESULT IN RACK MOUNT FLANGE FAILURE AND SUBSEQUENT INSTRUMENT DAMAGE The rack mounting contents and d...

Page 152: ...9220 4915 2 Tube Corrugated 1 9211 6672 1 Tray 2 9220 4972 2 Insert 3 and 7 5040 6967 8 Pad foam corner 4 and 8 5040 6968 1 Plastic Cap 5 9220 4914 1 Insert 6 9211 6671 1 Carton corrugated cardboard 9 None As Req d Reinforced packing tape N A None As Req d Staples N A Perform the following steps to package the 5071A for shipment 1 Pack the instrument as shown in Figure 7 2 on the next page using t...

Page 153: ... Programming Manual 125 Figure 7 2 5071A Packing Exploded View Note Due to changes in packaging regulations some of the material in the figure above may not be required Consult the 5071A shipping instructions on http www symmttm com 5071A Shipping for complete information ...

Page 154: ...the rear panel Ext DC Input connector The 5071A runs from ac power when both ac and dc power are available The 5071A will not run from dc power unless the ac power source fails or is disconnected In addition to ac power capability the 5071A can also be operated from an external dc source with a voltage range of 40 to 58 VDC 100 W maximum power The dc power source may be applied simultaneously with...

Page 155: ... details 7 Re apply ac power the front panel status message reads Source AC Follow the procedure below to set up and verify operation from auxiliary dc power 1 Connect the positive terminal of the 40 to 58 VDC power to the screw terminal of INPUT 1 on the rear panel 5 terminal barrier strip 2 Connect the negative terminal of the 40 to 58 VDC power to the screw terminal of INPUT 1 on the rear panel...

Page 156: ...it is the active dc fuse element 3 Insert the replacement fuse 5A 125 volt rating part number 2110 0838 4 Gently push the fuse holder back into the rear panel 1 Remove all power from the 5071A 2 Press down on the top edge of the dc FUSE cap located under the 48 VDC Input label then grasp the top and bottom of the fuse holder and gently pull it out back and slightly down The first fuse to appear is...

Page 157: ...age time required to deplete all capacity is at least one year Continued storage beyond one year could jeopardize future battery operation or reduce the remaining number of discharge cycles For storage times beyond one year always physically disconnect the batteries from the instrument When disconnected shelf life at 25 C the batteries may be stored for up to two years without recharging The permi...

Page 158: ...ies not be stressed by over use and under charging Either press the BATTERY DISCONNECT switch on the rear panel each time the power is turned off or Disconnect the battery wires inside the rear door to completely remove them from use Refer to page 28 of this manual for instructions on how to disconnect the batteries The rechargeable lead acid batteries in the 5071A are charged only when the instru...

Page 159: ... of such gaseous accumulation during normal operating circumstances is very remote but requires care as a preventive measure Battery Disposal The spent lead acid battery pack s is considered hazardous waste in some countries Dispose only in accordance with local environmental regulations Contact the nearest regional office of environmental health service for guidance The battery is recyclable as s...

Page 160: ...damage to the instrument or impaired instrument performance Use the following procedure to remove and replace the internal battery pack s 1 Open the Battery Access Panel on the rear panel of the instrument 2 Carefully disconnect the two battery cables from their mating instrument connections 3 Remove the battery pack s by sliding them out of the battery compartment 4 Install the new battery pack s...

Page 161: ...T PERIODIC OR CONTINUOUS OPERATION You can safely store the 5071A for extended periods of time by leaving the instrument connected to ac power and placing it into the Standby Mode of operation Refer to page 26 for details If you need to store the 5071A for extended periods without power the minimum amount of standby operation time required to maintain the tube s vacuum is 24 continuous hours for e...

Page 162: ...Chapter 7 Installation Cesium Beam Tube Replacement 134 Operating and Programming Manual ...

Page 163: ...____________________________________________ Appendix A Performance Tests Performance Tests Verifying Specifications ...

Page 164: ...perational Verification Complete Performance Tests RS 232 Verification Operational Verification The Operational Verification test is an abbreviated series of checks that may be performed to give a high degree of confidence that the instrument is operating properly without performing the complete Performance Tests An operational verification is useful for incoming inspection routine maintenance and...

Page 165: ...acteristics Use Model General Purpose Oscilloscope At least 100 MHz bandwidth Input 1 M OV T HP Agilent 54600A Spectrum Analyzer Frequency Range Span 0 to 40 MHz Measurement Resolution 1 kHz Div Center Frequency Accuracy 1 PPM P T HP Agilent 3585A B Linear Phase Comparator Input Frequency Range 5 to 10 MHz Input Level 50 1 Vrms Output 0 to 1 Vdc Output Linearity Proportional from 0 to 360 degrees ...

Page 166: ...071A Input Probe 1 1 1 M for 50 measurements T HP Agilent 10070A RF Signal Generator Frequency Range 80 MHz Power 7 dBm T HP Agilent 8656B Pulse Generator Repetition Rate 10 Hz Pulse Width 10 µsec Output Voltage 3V T HP Agilent 8111A General purpose DC Power Supply Adjustable 0 10V 25 ma T HP Agilent E3610A IBM Compatible PC MS DOS 3 3 or later 640 kB RAM 1 serial COM Port T Any Vendor Service Acc...

Page 167: ... SMA plug to SMA plug SMA jack to SMA jack SMB jack to SMB jack SMB plug to SMB plug SMC jack to SMC jack SMC plug to SMC plug T HP Agilent 10100C 0960 0496 1250 0080 1250 0832 1250 0831 1250 1236 1250 1857 1250 0780 1250 1250 1250 1249 1250 1159 1250 1158 1250 0672 1250 0669 1250 0827 1250 1113 Microwave Test Cable SMA male at both ends 10 dB loss at 10 GHz T GoreTex 32R01R01048 0 Special Tools N...

Page 168: ...wing messages are displayed on the LCD in sequence The message Waiting for Stabilization may appear If so it could stay on for up to 20 minutes before the following messages appear a Warming up this indicates self test passed successfully b Lowering E_mult voltage c Setting Osc Control d Setting RF amplitude e Setting E_mult voltage f Logging signal levels g Setting C field h Locking servo loops i...

Page 169: ...0 MHz output RS 232C Baud rate 2400 Data bits 8 Parity none Stop bits 1 System Logs Printer log disabled Error log lock completed These first time power up configurations can be changed by using the front panel controls See the section Setting the Output Port Frequency in Chapter 2 Using the 5071A of this manual for instructions on how to perform this 7 Mark Pass or Fail on the Performance Test Re...

Page 170: ...ut signals perform the following The LCD display backplane light will turn off after approximately 4 minutes to conserve energy if no front panel key is pressed Press any key to turn the backplane light back on 1 Connect one of the 5071A outputs to an input channel of the HP Agilent 54600A with a 50 feedthrough termination and BNC cable as shown in Figure A 1 Figure A 1 Rear Panel Outputs Verifica...

Page 171: ... 3 On your terminal press the Enter or Return key several times 4 Observe the returned scpi or E xxx prompt on the terminal screen If the above prompt appears the RS 232 Verification check passed If the prompt does not appear Check and verify all serial port parameters baud rate data bits stop bits and parity Check and verify the hardware connections and cabling for correct DTE DCE signal paths Se...

Page 172: ...Appendix A Performance Tests RS 232 Serial Port Verification 144 Operating and Programming Manual Figure A 2 RS 232C Cabling Setups ...

Page 173: ...s Harmonic Distortion and Spurious Signals Check A Harmonic Distortion Check for the 5 and 10 MHz Outputs Harmonics on the 10 MHz and 5 MHz output signals must be more than 40 dBc below the fundamental To perform this check a spectrum analyzer is tuned to the fundamental frequency and an amplitude reference is established The output frequency spectrum is then examined to determine fundamental to s...

Page 174: ...e in the marker menu area d Set both the resolution bandwidth RES BW and the video bandwidth VIDEO BW to 1 kHz Enter the 1 kHz values using the numeric and unit keys The RES BW and VIDEO BW values are displayed at the bottom of the screen The sweep time is 125 seconds DO NOT adjust the sweep time manually e Press the CONT button in the sweep menu area to begin a new sweep f When the new sweep has ...

Page 175: ...Spurious Signal Check for the 5 and 10 MHz Outputs Non harmonically related spurious signals on the 5 and 10 MHz outputs must be more than 80 dBc below the output signal levels To perform this test a spectrum analyzer is tuned to the 5 or 10 MHz signal and an amplitude reference is established The output frequency spectrum is then examined at 1 MHz on either side of the center frequency to determi...

Page 176: ...TR PRESET button and allow the analyzer to go through its auto range algorithm this will take about 5 seconds b Press the DISP LINE display line button in the marker menu and adjust the line to 80 0 dBc c Press the PEAK SEARCH button and then the MKR REF LVL button both are in the marker menu area d Set both the resolution bandwidth RES BW and the video bandwidth VIDEO BW to 1 kHz Enter the 1 kHz ...

Page 177: ...0 MHz output 4 On the 5071A set output ports 1 and 2 to 5 MHz using the front panel controls 5 Repeat step 3 6 Connect 5071A Port 2 to the 3585B Spectrum Analyzer and repeat steps 2 through 5 to test Port 2 7 Record the actual reading in the appropriate place in the Performance Test Record C Harmonic Distortion Check for the 1 MHz Output Harmonics on the 1 MHz output signal must be more than 40 dB...

Page 178: ... in the entry menu c Press the DSP LINE button and move the display line to 40 0 dBc d Press the PEAK SEARCH button then the MKR REF LVL button e When the new sweep has passed through the fundamental frequency press the OFFSET and the ENTER OFFSET buttons in the marker menu area Verify that both the offset frequency Hz and the offset level dB go to zero 0 Hz and 0 dB should be displayed at the top...

Page 179: ...rm this check a spectrum analyzer is tuned to the fundamental frequency and an amplitude reference is established The output frequency spectrum is then examined to determine fundamental to sideband amplitude relationship at harmonic points of the fundamental Equipment HP Agilent 3585B Spectrum Analyzer Setup Figure A 6 100 kHz Harmonic Distortion Test Setup Specifications All harmonics must be 40 ...

Page 180: ...hen the MKR REF LVL button e Set the resolution bandwidth RES BW to 300 Hz and the video bandwidth VIDEO BW to 1 kHz The sweep time is 66 8 seconds DO NOT adjust the sweep time manually f Press the CONT button in the sweep menu area to begin a new sweep g When the new sweep has passed through the fundamental frequency press the OFFSET and the ENTER OFFSET buttons in the marker menu area Verify tha...

Page 181: ...comparator or software is being used refer to this procedure as a general guide In this test the reference standard must be of known accuracy The measurement time must be of sufficient length so the accuracy of the measurement is not impaired by the stability of either the reference standard or the unit under test If the reference standard is a 5071A with Option 001 the accuracy measurement must b...

Page 182: ... to INPUT A and the 5071A unit under test 10 MHz to INPUT B as shown in Figure A 7 5 Set K34 59991A ZERO OPER FULL front panel mounted toggle switch to ZERO Adjust the ZERO SCALE control for a zero reading on the meter Then adjust the recorder for a zero indication 6 Set K34 59991A switch to FULL and adjust FULL SCALE control for a full scale reading on the recorder 7 Check both ZERO and FULL SCAL...

Page 183: ...F is the desired frequency difference and Dt is the phase change in seconds over the measurement time T The Figure A 8 shows a typical plot using the strip chart recorder Figure A 8 Error Measurement In the example the frequency difference f F is computed as follows f F t T 7 minor divisions 2 10 9 seconds minor divisions 14 10 9 seconds T 8 hours or 2 88 104 seconds f F t T 14 10 9 2 88 104 4 9 1...

Page 184: ...chnology 325 Broadway Boulder CO 80303 3328 USA Telephone 303 497 3753 A Time Domain This is an engineering level measurement requiring a special test setup The test setup must be carefully designed to eliminate all sources of noise For more information on how to make this measurement see Application Note 358 12 Also see NIST Technical Note 1337 available from US Government Printing Office Washing...

Page 185: ...__ ____ 2 Rear Panel Output Signal Checks ____ ____ 3 RS 232 Serial Port Verification ____ ____ 5071A Complete Performance Tests Test Number Test Description Actual Reading Limits 1 Output Signals Harmonic Distortion and Spurious Signals Check A Harmonic Distortion Check for the 5 and 10 MHz Outputs ___________ Greater than 40 dBc B Non harmonic Spurious Signal Check for the 5 and 10 MHz Outputs _...

Page 186: ...Appendix A Performance Tests 5071A PERFORMANCE TEST 158 Operating and Programming Manual ...

Page 187: ...____________________________________________ Appendix B Glossary Glossary ...

Page 188: ...ly constant value is reached This value is known as the flicker floor Frequency Domain Stability also called single sideband phase noise or additive noise Describes the spectral noise in the specified output signal caused by phase modulation from internal noise sources The measurement is normalized by expressing the ratio of noise power in a 1 Hz bandwidth to the signal power then measured as a fu...

Page 189: ...t is calculated is called the Root Allan Variance Symbolically it is represented by the term y 2 where y is the standard deviation 2 means that measurements are taken in pairs and is the measurement time In the 5071A specifications values for all averaging times are shown in one chart for convenience However short term stability specifications for averaging times in excess of 1000 seconds are vali...

Page 190: ...Appendix B Glossary 5071A Glossary 162 Operating and Programming Manual ...

Page 191: ... reset 26 D Data entry keypad 3 16 Dc power operation 126 power requirements 120 voltage 120 Diagnostic commands 73 Diagnostic self tests 25 Disabling the internal back up battery 28 Display commands 83 E Error messages 106 Event log 22 External dc power operation 126 power requirements 120 voltage 120 F Front panel status lights 32 Front panel warning messages 34 Fuse ac power 121 dc power 128 G ...

Page 192: ...71A 37 RS 232 default values 44 serial port verification 143 S SCPI command summary 73 Serial port 27 41 configuration 44 pin assignments 42 Set the 1PPS output 19 Set the date 11 Set the output port frequency 17 Set the time 11 Specifications accuracy and stability 111 supplemental characteristics 114 Starting the 5071A 8 Status lights 31 Status monitoring commands 90 Storage 133 Sync input 3 Syn...

Page 193: ...vailable by phone 24 hours a day 7 days a week through the Main Customer Assistance Center number above and from 8 AM to 5 PM Central European Time weekdays at the Europe Middle East and Africa number Customers who have purchased Technical Support Contracts may e mail support requests to support symmetricom com Americas Asia Pacific Rim emeasupport symmetricom com Europe Middle East Africa Custome...

Page 194: ...roduct Repair Administration personnel are available by phone 8 AM to 5 PM Pacific Time USA weekdays through the Main Customer Assistance Center number above and 8 AM to 5 PM Central European Time weekdays at the Europe Middle East and Africa number For more information about repairs advance replacements and warranty coverage click here What about other kinds of service Do you need training instal...

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