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Chapter 4 Command Reference

Internal Oscillator Calibrating and Status Commands (Option 010

Only)

User’s Guide

4-9

Internal Oscillator Calibrating and Status
Commands (Option 010 Only)

DIAGnostic:CALibration:ROSCillator:EFC:ABSolute UP | DOWN

This command sets the absolute EFC (electronic frequency control) of
the oscillator.

Use UP or DOWN to adjust the EFC by the increment specified in the
STEP command described below.

For example, if present EFC value is 1000 and STEP value is 13,
DIAG:CAL:ROSC:EFC:ABS:UP will increase the EFC value to 1013.

DIAGnostic:CALibration:ROSCillator:EFC:ABSolute?

This query returns the absolute EFC value of the oscillator.

Returns an integer.

DIAGnostic:CALibration:ROSCillator:EFC:ABSolute:STEP
<numeric_value>

This command sets amount by which the absolute EFC value is
incremented when being adjustment.

Use an integer for the STEP incremental value (<numeric_value>.

For example, if present EFC value is 1000 and STEP value is 13,
DIAG:CAL:ROSC:EFC:ABS:UP will increase the EFC value to 1013.

DIAGnostic:CALibration:ROSCillator:EFC:ABSolute:STEP?

This query returns the incremental step value by which the absolute
EFC value is adjusted.

Returns an integer.

[SOURce]:ROSCillator:QUEStionable?

This query reports if the internal oscillator is producing 10 MHz.

Returns a single character, 0 or 1.

A value of 0 indicates oscillator output is normal.

A value of 1 indicates oscillator output is questionable.

Summary of Contents for 58502A

Page 2: ...ll Center 44 7000 111666 Technical Assistance 44 7000 111888 Sales 44 1604 586740 Fax 408 428 7998 E mail ctac symmetricom com Internet http www symmetricom com Warning Symbols That May Be Used In This Book Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual Indicates hazardous voltages Indicates earth ground te...

Page 3: ...erminal Communications for NT 4 0 Windows 95 Based PC 1 7 To Configure Terminal Communications for Windows Based PC 1 8 Powering Up the Distribution Amplifier 1 9 Overview of the Power Up Procedure What to Expect 1 9 To Power Up the Distribution Amplifier 1 9 Using Commands to Control Key Functions Examples 1 11 Overview 1 11 Setup Commands for the Different Distribution Applications 1 12 Distribu...

Page 4: ... Tests 2 11 Test 1 7 dBm Input Level 2 12 Test 2 15 dBm Input Level 2 13 58502A Performance Test Record Page 1 of 2 2 14 58502A Performance Test Record Page 2 of 2 2 15 58502A Calibration Option 010 Only 2 16 Overview 2 16 Equipment 2 17 Procedures 2 17 Determining Frequency Difference 2 17 Software Oscillator Adjustment 2 18 Calibration Record Page 1 of 1 2 20 3 Features and Functions Chapter Con...

Page 5: ...ernal Oscillator as a Backup Option 010 3 12 To Configure the Internal Oscillator as the Only Source Input Option 010 3 12 4 Command Reference Chapter Contents 4 2 SCPI Conformance Information 4 3 Command Syntax Conventions 4 3 IEEE 488 2 Common Commands 4 3 58502A Command Summary 4 4 System Status Reporting Commands 4 6 Identification Command 4 8 Internal Oscillator Calibrating and Status Command...

Page 6: ...Contents vi User s Guide 6 Service Introduction 6 2 Determining 58502A Fault Status 6 2 7 Specifications Introduction 7 2 Index ...

Page 7: ...tions of this guide Chapter 3 Guide Organization provides information on 58502A features and functions and how to connect it to computers Chapter 4 Command Reference lists and describes the Standard Commands for Programmable Instruments SCPI commands used to monitor set or change parameters of the 58502A Chapter 5 Functional Description provides a brief simplified block diagram description of how ...

Page 8: ...through the INPUTS A or B channel Auto Switching and Alarm Inputs Features The 58502A has two features that ensure your critical frequencies are always present First there is the auto switching feature When the 58502A detects one of its inputs is removed or the amplitude of the input is greatly reduced it will automatically switch to the other input Second there is the alarm inputs feature The 585...

Page 9: ...58502A allow you to query through the RS232 interface port the individual distribution input and output channels for the presence or absence of a signal Front panel status indicators provide you with a quick visual indication of individual channel health Accessories Supplied and Available Supplied Power cord 180 cm 6 ft detachable Manuals 58502A Distribution Amplifier User s Guide this guide part ...

Page 10: ...In This Guide x User s Guide ...

Page 11: ...1 Getting Started ...

Page 12: ...6 7 8 9 10 11 12 58502A DISTRIBUTION AMPLIFIER A B ALARM STATUS AC Input 1 2 3 4 5 6 7 8 9 10 11 12 RS232 INPUTS 5 VRMS MAX 100 240 VAC 50 60GHz 40 VA Max OUTPUTS see into on bottom WARNING To avold electric shook Do not remove covers No user serviceable parts inside profer all servcing to qualtiled perersonnal This unit must be earth grounded CAUTION METRIC INCH HARDWARE CONSULT SERVICE MANUAL 1 ...

Page 13: ...t A or B indicator lights it indicates that an input signal is present at input A or B 4 When any of the OUTPUT STATUS 1 12 indicators light it indicates the associated output is functioning 5 AC Input power jack 6 RS232 serial interface port allows you to remotely control and monitor the 58502A Its communication language is SCPI The connector is a DTE configuration DE 9P male 7 ALARM STATUS port ...

Page 14: ...er a flush or protruding installation The angle brackets are provide in the Option AX4 Rack Mount Kit Figure 1 1 Attaching Mounting Brackets for Equipment Rack 3 Attach the bracket to the instrument using four T 15 TORX screws 2 part number 0515 0380 These screws are provided in the Option AX4 Rack Mount Kit 4 Repeat steps 1 through 3 to attach a bracket to the other side of the instrument 5 Place...

Page 15: ...mputer is needed for you to remotely monitor the status of the 58502A and to change setup parameters 1 If you are going to communicate with the 58502A using a terminal or PC personal computer connect the computer to the rear panel RS232 port using an HP 24542U interface cable or equivalent RS 232 null modem cable with DE 9S female connectors at each end as shown in Figure 1 2 Figure 1 2 Connecting...

Page 16: ...e one of the following programs PROCOMM PLUS DATASTORM Technologies Inc PROCOMM PLUS for Windows Cross Talk Hayes or any other terminal emulation program 3 If you are using an NT 4 0 based or Windows 95 based PC perform the procedure in the subsection To Configure Terminal Communications for NT 4 0 Windows 95 Based PC on page 1 7 OR If you are using a Windows based PC perform the procedure in the ...

Page 17: ...to configure the RS 232 port of your PC 5 Set the RS 232 port of your PC to match the following default values Baud rate Bits per second 9600 Parity None Data bits 8 Stop bits 1 Pace flow control None NOTE The RS 232 port configurations of the 58502A and the PC must be the same for communications between the two If the 58502A is being powered up for the first time set your PC to match the factory ...

Page 18: ... that allows you to configure your PC 3 Set the RS 232 port of your PC to match the following default values Pace None Baud Rate 9600 Parity None Data Bits 8 Stop Bits 1 NOTE See the important NOTE on page 1 7 that provides information on what to do if the factory default values of the 58502A s RS 232 port have been changed 4 In the Communications dialog box be sure to select the appropriate port ...

Page 19: ...puter is optional connect the 58502A s outputs as required for your application and provide at least one input at either the input A or B rear panel input connector NOTE Without 50Ω termination of the outputs the front panel OUTPUT STATUS indicators may not operate properly because the amplitude of the output signals may not be within specifications See the section Features and Functions in Chapte...

Page 20: ...1 3 Inputs and Outputs Connections For Your System Terminal or PC is Optional HP 24542U F1047 80002 or equivalent Interface cable DTE RS232 Port DTE Input s Outputs to System A B 1 2 3 4 5 6 7 8 9 10 11 12 5VRMS MAX 100 240 VAC 50 60GHz 40 VA Max 58502A Distribution Amplifier Terminal or PC ...

Page 21: ... that can be used with the 58502A Distribution of one input A or B Distribution of two inputs A and B Distribution of input A with internal backup oscillator OCXO Distribution of the internal backup oscillator OCXO only Each of the above require a different set of commands to be used with this instrument See the subsection Setup Commands for the Different Distribution Applications starting on page...

Page 22: ...used Distributing Two Input Signals A and B To Check the Input A Channel Signal Status Enter INP A QUES and press Return If 0 is returned input signal is present If 1 is returned input signal is absent To Check the Input B Channel Signal Status Enter INP B QUES and press Return If 0 is returned input signal is present If 1 is returned input signal is absent To Select the Input A Channel Enter INP ...

Page 23: ...To Check the Input A Channel Signal Status Enter INP A QUES and press Return If 0 is returned input signal is present If 1 is returned input signal is absent To Verify that the Internal Oscillator Option 010 is Producing 10 MHz Enter ROSC QUES and press Return If 0 is returned oscillator output is normal If 1 is returned oscillator output is questionable To Check the Input Channel Automatic Switch...

Page 24: ... indicates an output fault For example the following string indicates that channels 2 and 7 are not functioning 0 1 0 0 0 0 1 0 0 0 0 0 To Use Packed Integer to Check Output Channels Enter OUTP QUES PACK and press Return An array of Boolean returns The returned string provides status on each 10 MHz output in a single packed integer Each bit is associated with an output channel The least significan...

Page 25: ...o make corresponding changes to your PC serial port parameters after changing the instrument s serial port characteristics At first power on from the factory serial port settings are as follows Full Duplex is ON can be turned OFF Baud rate is 9600 can also be set to 1200 2400 or 19200 Data bits is 8 set by parity None Pace is NONE can be changed to XON Parity is NONE can also be set to ODD or EVEN...

Page 26: ...ple to 19200 enter SYST COMM SER BAUD 19200 and press Return To set pacing for example to XON enter SYST COMM SER PACE XON and press Return To see how pacing is currently set enter SYST COMM SER PACE and press Return To set parity for example to ODD enter SYST COMM SER PARITY ODD and press Return To see what data bits are set enter SYST COMM SER BITS and press Return ...

Page 27: ...2 Performance Tests Verifying Specifications ...

Page 28: ...ibration Option 010 Only starting on page 2 2 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 Acceptance Test An operational verification is useful for incoming inspection and after instrument repair Performance Tests The Performan...

Page 29: ...Chapter 2 Performance Tests Introduction User s Guide 2 3 ...

Page 30: ...nt OV Universal Counter Frequency Range 100 kHz to 100 MHz 10 digits resolution 10 MHz HP 53131A or equivalent C for Option 010 only 10 MHz Reference Source 10 MHz Reference Signal Accuracy 2 X 10 12 HP 5071A or equivalent C Terminal or computer Communication software RS 232 connection Any Model OV P C RMS Voltmeter Accuracy 2 at 3V Full Scale 1 MHz HP 3400B or equivalent P 50Ω BNC Feedthrough ___...

Page 31: ...hese verification procedures fail try repeating them If failure still occurs refer to Chapter 6 Service in this guide for fault determination and instructions on returning the defective unit for repair Outputs 1 12 Verification 1 Apply power to the 58502A and verify successful completion of self test before proceeding to step 2 See the subsection To Connect AC Power on page 1 5 in Chapter 1 of thi...

Page 32: ...oscope to each of the rear panel output ports in turn to verify that the output signal is a nominal 1 V rms 2 8 Vp p sine wave at 10 MHz 7 Disconnect the signal from the 58502A rear panel input connector 8 Verify that all input and output LEDs are off This indicates loss of input and output 9 Mark Pass or Fail in Line 1 on the Operational Verification portion of the 58502A Performance Test Record ...

Page 33: ...on by shorting to ground any of the outputs 1 12 Let s use output 12 as shown in Figure 2 3 Figure 2 3 Output 12 Grounded 3 Observe that the front panel Alarm indicator illuminates and the ALARM STATUS output pins 2 3 and 4 go active TTL low approximately 20 mV Figure 2 4 shows the output pins 2 3 and 4 and ground pins 1 5 and 9 58502A Distribution Amplifier HP 8663A Sythesized Signal Generator or...

Page 34: ...cator illuminates and output pins 2 3 and 4 go low then all associated ALARM STATUS output circuitry is functional 4 Mark Pass or Fail in Line 2 on the Operational Verification portion of the 58502A Performance Test Record located on page 2 14 This completes the operational verification 1 2 3 4 5 6 7 8 9 GND Outputs GND GND ...

Page 35: ...ing the Distribution Amplifier with a Terminal or personal computer PC connect it to the rear panel RS232 port using an HP 24542U interface cable or equivalent RS 232 null modem cable with DE 9S female connectors at each end as shown in Figure 2 5 Figure 2 5 RS 232 Verification Setup 3 Turn on the PC or terminal HP 24542U F1047 80002 or equivalent Interface cable RS232 Port A B 1 2 3 4 5 6 7 8 9 1...

Page 36: ...ormation on setting above parameters a Press Return or Enter key on the PC The scpi prompt should be displayed b At the prompt type IDN c Press Return This query returns the 58502A identification similar to the following HEWLETT PACKARD 58502A 3426A 00123 3422 A 5 Mark Pass or Fail in Line 3 on the Operational Verification portion of the 58502A Performance Test Record located on page 2 14 Pace NON...

Page 37: ...nt is selected according to the Table 2 1 Recommended Test Equipment on page 2 4 Equipment HP 8663A Signal Generator or equivalent HP 3400B RMS Voltmeter or equivalent 50Ω BNC Feedthrough HP 10100C or equivalent Use the 50Ω feedthrough if you are using the HP 54600B Oscilloscope however if you are not using this scope DO NOT use the 50Ω feedthrough 2 Input Level Response Tests A 10 MHz signal is i...

Page 38: ...6 Input Level Response Test Setup 5 Set the RMS voltmeter to 3V Full Scale Range 6 Starting with Output 1 verify that the RMS voltage on each of the twelve Outputs is from 0 707 to 1 12 Vrms 7 Record the reading of each output channel on the Performance Tests portion of the 58502A Performance Test Record in the Test 1 section located on page 2 14 HP 3400B RMS Voltmeter or equivalent 50Ω Feedthroug...

Page 39: ...er still set to 3V Full Scale Range adjust the signal generator to LEVEL 15 dBm 2 Verify that the RMS voltage on each of the twelve Outputs is from 0 707 to 1 12 Vrms 3 Record the reading of each output channel on the Performance Tests portion of the 58502A Performance Test Record in the Test 2 section located on page 2 15 This completes the performance tests ...

Page 40: ...1 12 Verification ____ ____ 2 Alarm Status Verification ____ ____ 3 RS 232 Verification ____ ____ 58502A Performance Tests Input Level Response Tests Test 1 7 dBm Input Level Minimum Actual Reading Outputs 1 12 Maximum 0 707 Vrms 1 ________________________ 1 12 Vrms 0 707 Vrms 2 ________________________ 1 12 Vrms 0 707 Vrms 3 ________________________ 1 12 Vrms 0 707 Vrms 4 ________________________...

Page 41: ...707 Vrms 2 ________________________ 1 12 Vrms 0 707 Vrms 3 ________________________ 1 12 Vrms 0 707 Vrms 4 ________________________ 1 12 Vrms 0 707 Vrms 5 ________________________ 1 12 Vrms 0 707 Vrms 6 ________________________ 1 12 Vrms 0 707 Vrms 7 ________________________ 1 12 Vrms 0 707 Vrms 8 ________________________ 1 12 Vrms 0 707 Vrms 9 ________________________ 1 12 Vrms 0 707 Vrms 10 ____...

Page 42: ...ient period of time to make this adjustment NOTE When attempting to calibrate the 58502A with the SCPI software commands you will need to establish serial communication via a terminal or PC Frequency adjustments can be made after determining the internal oscillator frequency error of the 58502A The basic 10 MHz oscillator frequency can be adjusted as required to obtain the desired frequency using ...

Page 43: ... equivalent Two BNC Cables 1 meter male to male Procedures Determining Frequency Difference The frequency difference is measured by synchronizing the frequency counter with a known standard and observing the 58502A frequency output to a resolution of at least 10 digits 1 Connect 10 MHz reference to HP 53131A Universal Counter s or equivalent rear panel external timebase Reference input as shown in...

Page 44: ...wing SCPI command to ascertain the EFC value currently applied DIAG CAL ROSC EFC ABS HP 53131A Universal Counter or equivalent BNC Cable BNC Cable Outputs 1 12 HP 24542U Interface cable or equivalent RS232C Port To any available Output A B 1 2 3 4 5 6 7 8 9 10 11 12 5VRMS MAX 100 240 VAC 50 60GHz 40 VA Max 58502A Distribution Amplifier Terminal or PC Ref In 50Ω Feedthrough HP 10100C 5071A PRIMARY ...

Page 45: ...oach the proper frequency change the step size to smaller values by sending the following SCPI command DIAG CAL ROSC EFC ABS STEP value The default step size is 10 000 A recommended first reduction in size should be to 1 000 4 Continue to adjust UP or DOWN with finer increments until the frequency output is 10 MHz 1 10 9 0 01 Hz 5 Record the date EFC value and frequency value on the Calibration re...

Page 46: ..._________ Repair Work Order No _________________ Test Performed By _______________________ Temperature __________________________ Date _____________________________________ Relative Humidity ____________________ Notes ___________________________________________________________________________ Calibration Dates and Values Date EFC Value Frequency or Frequency Difference 1 2 3 4 5 6 7 8 9 10 11 12 ...

Page 47: ...3 Features and Functions ...

Page 48: ...wer Indicator page 3 6 Alarm Indicator page 3 6 Input A and B Indicators page 3 6 OUTPUT STATUS 1 12 Indicators page 3 6 Serial Interface Ports page 3 7 RS 232 Port page 3 7 RS 232 Configuration page 3 7 Connecting a Terminal or Computer page 3 9 To Connect a Terminal or Computer to the 58502A page 3 9 Different Ways to Check Alarm Status page 3 11 Configuring the Inputs page 3 11 To Configure One...

Page 49: ...lid signals are present at both ports If input A signal goes away while there is a signal at input B the auto switching feature automatically switches to using the input B signal However if the input A signal returns the 58502A will continue to use the input B signal It will not return to using the input A signal until you send the SCPI commands INP SEL A and INP SEL AUTO 1 Outputs OUTPUTS 1 12 Po...

Page 50: ...rm status of the 58502A ALARM STATUS Port Outputs The output pins 2 3 and 4 of this port shown in Figure 3 1 allow you to monitor the status of the 58502A Output pins 2 3 and 4 are a TTL high 3 5 Vdc minimum when operation is normal and TTL low 1 5 Vdc maximum if there is an alarm Figure 3 1 Alarm Outputs All of the output pins are at a TTL high when there is no alarm condition When an alarm condi...

Page 51: ...to input B is received by the 58502A except the alarm information is routed to pin 7 of the ALARM STATUS connector The INP ALARM query returns the alarm status of frequency sources connected to pins 6 and 7 See Chapter 4 Command Reference for details on this query The following paragraphs provide an example on how the alarm system works Let s say you connected the HP 5071A Primary Frequency Standa...

Page 52: ...stem Illumination of this indicator could mean that one or more outputs are at fault or an input signal is absent at both inputs A and B or the 58502A has received alarm signals from the external precision frequency sources Input A and B Indicators These indicators light when a sinusoidal input signal is present at input A or B OUTPUT STATUS 1 12 Indicators These indicators light when the associat...

Page 53: ...uration Software pacing baud rate parity data bits and stop bits parameters for this interface are user selectable Table 3 2 shows the factory default settings and the commands to send to change them Table 3 2 RS 232 Port Interface Factory Default Values and Commands Procedures for configuring the RS 232 ports are provided in the following subsections ALARM STATUS RS232 Parameter Default Command P...

Page 54: ...r will retain its original settings At each step you will have stopped serial communications and be forced to modify your PC settings to match the 58502A in order to continue It is recommended that you make all changes in a single compound command verify the changes and record all parameters The command line below would set the RS 232C port pacing to XON baud rate to 2400 and parity to EVEN SYST C...

Page 55: ...are also called null modem cables The rear panel RS232 port is DTE The interface cable must also have the proper connector on each end and the internal wiring must be correct Connectors typically have 9 pins DE 9 connector or 25pins DB 25 connector with a male or female pin configuration A male m connector has pins inside the connector shell and a female f connector has holes inside the connector ...

Page 56: ...uter 3 10 User s Guide Figure 3 3 Connecting a PC or Terminal to the 58502A HP 24542U F1047 80002 or equivalent Interface cable DTE RS232 Port DTE A B 1 2 3 4 5 6 7 8 9 10 11 12 5VRMS MAX 100 240 VAC 50 60GHz 40 VA Max 58502A Distribution Amplifier Terminal or PC ...

Page 57: ...Input Operation Connect the input signal to either input A or B The input signal will appear on all twelve outputs To Configure Two Input Operation Connect the primary or preferred input signal to input A and connect the secondary input to input B The input signal will appear on all twelve outputs If the primary input fails the 58502A will automatically switch to input B and the secondary input si...

Page 58: ... 58502A only if input A signal fails After powerup allow the oscillator to warm up for 5 minutes before using the signals To Configure the Internal Oscillator as the Only Source Input Option 010 If the 58502 Distribution Amplifier contains the optional quartz oscillator Option 010 you only need to connect the 58502A to ac power The oscillator will provide the output signals After powerup allow the...

Page 59: ...4 Command Reference ...

Page 60: ...chapter is organized as follows SCPI Conformance page 4 3 Command Syntax Conventions page 4 3 IEEE 488 2 Common Commands page 4 3 58502A Command Summary page 4 4 System Status Reporting Commands page 4 6 Identification Command page 4 8 Internal Oscillator Calibration and Status Commands Option 010 Only page 4 9 Input Ports Status and Setup Commands page 4 11 Serial Interface Communication Commands...

Page 61: ...T part of the command and should not be sent to the instrument 1 2 Means use either 1 or 2 numeric_value Means enter a number POSition Means you MUST use either all the uppercase letters or the entire word The lowercase letters are optional For example POS and POSITION are both valid However POSI is not valid Note POSition is used here as an example but this convention is true for all command keyw...

Page 62: ... DOWN to adjust the EFC by the increment specified in the STEP command see next command For example if present EFC value is 1000 and STEP value is 13 EFC ABS UP will increase EFC value to 1013 Query STEP EFC increment value Increments the EFC value by this amount STEP returns EFC increment value Query INPut INPUT Subsystem A QUEStionable returns 0 or 1 Reports if there is a signal present on input...

Page 63: ...tputs are outputting the source signal If there was no output from outputs 2 and 3 the response would be 6 1 0 2 1 4 1 8 0 6 UNPacked returns array of Boolean Provides status on each output lowest numbered output to highest 0 signal at output 1 no signal at output Same result as PACKed see prior command but information on each output is provided with separate value If outputs 3 and 5 were not outp...

Page 64: ...ay be additional internal conditions that generate alarm 1 is returned If all of the outputs are functional and there is no input alarm 0 is returned OUTPut QUEStionable PACKed This query returns the status on each output in a single packed integer Each bit is associated with an output channel The least significant bit output 1 next bit output 2 and so on Returns binary weighted decimal If bit is ...

Page 65: ... Boolean 0 signal at output 1 no signal at output Same result as PACKed see prior command but information on each output is provided with separate value If outputs 3 and 5 were not outputting the source signal the response would be 0 0 1 0 1 0 0 0 0 0 0 0 SYSTem ERRor This query returns the oldest error in the Error Queue and removes that error from the queue first in first out Returns an error nu...

Page 66: ...he product serial number and WWWW is the product s firmware revision date code and V is the hardware revision letter In the product serial number XXXXY ZZZZZ XXXX is a four digit prefix that identifies a series of instruments Y identifies the country in which the instrument was manufactured e g the A in 3752A000123 stands for America ZZZZZ is a five digit suffix that identifies a particular instru...

Page 67: ... the absolute EFC value of the oscillator Returns an integer DIAGnostic CALibration ROSCillator EFC ABSolute STEP numeric_value This command sets amount by which the absolute EFC value is incremented when being adjustment Use an integer for the STEP incremental value numeric_value For example if present EFC value is 1000 and STEP value is 13 DIAG CAL ROSC EFC ABS UP will increase the EFC value to ...

Page 68: ...d Status Commands Option 010 Only 4 10 User s Guide SOURce ROSCillator WARM This query reports if the internal oscillator is warmed up Returns a single character 0 or 1 A value of 0 indicates oscillator is not warm A value of 1 indicates oscillator output is warm ...

Page 69: ... present not questionable A value of 1 indicates no signal is present INPut ALARM This query returns the alarm status of devices connected to the alarm input pins 6 and 7 of the ALARM STATUS port A value of 0 0 0 indicates no alarm exists A value of 1 0 0 indicates that an alarm exists from the device connected to pin 6 A value of 0 1 0 indicates that an alarm exists from the device connected to p...

Page 70: ...Lect AUTO This query returns the state of the automatic input switching feature Returns single character 0 or 1 A value of 0 indicates disabled A value of 1 indicates enabled INPut SELect DEFault A B This command selects the default input channel or port to be used at powerup This setting has no impact on auto switching and does not affect the current input channel selection This setting is stored...

Page 71: ... 232 port Returns a an integer SYSTem COMMunicate SERial BITS This query returns the data bits value of the RS 232 port Returns 7 for even or odd parity Returns 8 for no parity SYSTem COMMunicate SERial FDUPlex ON OFF This command sets the duplex state of the RS 232 port Use this command when you cannot see on the computer screen the characters you are typing for your command ON enables echoing of...

Page 72: ... state is stored in non volatile memory It is unaffected by powerup SYSTem COMMunicate SERial PACE This query returns the flow control state of the RS 232 port Returns XON or NONE SYSTem COMMunicate SERial PARity EVEN ODD NONE This command sets parity of the RS 232 port The choices are EVEN ODD or NONE The parity state is stored in non volatile memory It is unaffected by powerup If parity is enabl...

Page 73: ...5 Functional Description ...

Page 74: ... Guide Introduction This chapter gives a simplified functional description of the 58502A Broadband Distribution Amplifier The 58502A provides twelve channel isolation and distribution for a input timing signal which frequency can range from 100 kHz to 10 MHz ...

Page 75: ...nel LEDs 2 to 1 Switch 1 to 12 Amplifiers and Isolators Power Supply Module Figure 5 1 is a simplified overall block diagram the 58502A circuitry Figure 5 1 Simplified Block Diagram 5 Vdc input select output condition 15 Vdc 15 Vdc Controller RS 232 Input A Power AC Input B Panel LEDs Alarm input status Alarm status Output 1 Output 2 Output 12 1 to 12 Amplifiers and Isolators 2 to 1 Switch Power S...

Page 76: ...n the power all output status and one or both input system status indicators should illuminate If an effective input signal is lost absent on both inputs A and B then both input A and B and all output status indicators will be extinguished and the alarm indicator will be lit If a hardware fault occurs on one or more output distribution channels then that channel s associated indicator will be exti...

Page 77: ...put is impervious to the effects an adjacent channel short or open connection during normal operation A single input signal feeds all twelve isolation amplifiers that is routed from the output of the 2 to 1 Switch block This block includes BITE hardware Built In Test Equipment that monitors the presence of all twelve outputs and routes this information to the Controller block via the output condit...

Page 78: ...Chapter 5 Functional Description Functional Block Description of the 58502A 5 6 User s Guide ...

Page 79: ...6 Service ...

Page 80: ...ed in Chapter 1 Getting Started of this guide If the test passes go to step 3 If the test fails go to step 5 3 Verify the Alarm Status output operation as described in the ALARM STATUS Verification subsection in Chapter 2 Performance Test If pass go to step 4 If the test fails twice go to step 5 4 If steps 1 through 3 pass successfully performance the procedures in the section titled 58502A Perfor...

Page 81: ...7 Specifications ...

Page 82: ... supplemental characteristics for the 58502A Broadband Distribution Amplifier Electrical specifications describe the instrument s warranted performance Supplemental characteristics are intended to provide information useful to apply to the instrument by giving typical or nominal but non warranted performance parameters ...

Page 83: ...o Port Isolation 100 dBc typical measured by switching between open and short loads on output port and measuring associated phase noise on adjacent output port Environmental Specifications Temperature Operating 0 C to 55 C Non operating 40 C to 70 C EMI CISPR 11 Group 1 Class B Remote System Interface and Control Data Communications RS 232C DTE Connector DE 9P male Alarm Status Input and Output Co...

Page 84: ...Chapter 7 Specifications Introduction 7 4 User s Guide ...

Page 85: ...d 4 13 baud rate 3 7 C calibration record 2 20 Cesium viii channel inputs viii channels input A 3 3 input B 3 3 outputs viii twelve outputs 3 3 circuit description block level 5 3 command common 4 2 command summary table 4 4 command syntax conventions 4 3 commands CLS 4 6 IDN 4 8 ALARm 4 6 DIAGnostic CALibration ROSCillator EFC ABSolute 4 9 DIAGnostic CALibration ROSCillator EFC ABSolute STEP 4 9 ...

Page 86: ...syntax 4 3 D data bits 3 7 4 13 Data Terminal Equipment 3 9 default values 1 7 1 8 2 10 description commands 4 2 description of HP 58502A viii DIAGnostic CALibration ROSCillato EF C ABSolute 4 9 DIAGnostic CALibration ROSCillator EF C ABSolute 4 9 DIAGnostic CALibration ROSCillator EF C ABSolute STEP 4 9 DIAGnostic CALibration ROSCillator EF C ABSolute STEP 4 9 DTE device 3 9 DTE to DTE interface ...

Page 87: ... verification test 2 2 organization manual vii output channel 4 5 output channels viii output ports viii OUTPUT STATUS 1 12 indicators 1 3 3 6 OUTPut QUEStionable PACKed 4 6 command 4 6 OUTPut QUEStionable PACked 4 6 OUTPut QUEStionable UNPacked 4 7 outputs 1 12 1 3 1 12 outputs 3 3 outputs 1 12 3 3 OUTPUTS 1 12 connectors 1 3 P pace 3 7 4 14 pacing 3 7 parameters 3 7 parity 3 7 4 14 performance t...

Page 88: ... 3 7 specifications electrical 7 2 supplemental 7 2 stop bits 3 7 syntax 4 3 system health verification ix SYSTem COMMunicate SERial BAUD 4 13 SYSTem COMMunicate SERiaL BAUD 4 13 SYSTem COMMunicate SERial BITS 4 13 SYSTem COMMunicate SERial FDUPlex 4 13 SYSTem COMMunicate SERial FDUPlex 4 14 SYSTem COMMunicate SERial PACE 4 14 SYSTem COMMunicate SERial PACE 4 14 SYSTem COMMunicate SERial PARity 4 ...

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