Symmetricom 58502A User Manual

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58502A

Broadband Distribution

Amplifier

097-58502-01

Issue 1: Mar 00

User’s Guide

This manual provides information on the 58502A Broadband Distribution Amplifier, including performance tests, command reference, functional description, service, and specifications.

Warning Symbols That May Be Used In This Book

For assistance, contact:

Symmetricom, Inc. 2300 Orchard Parkway San Jose, CA 95131-1017

U.S.A. Call Center:

888-367-7966 (from inside U.S.A. only – toll

free)

408-428-7907

U.K. Call 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

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) terminal.

Indicates terminal is connected to chassis when such connection is not apparent.

Indicates Alternating current.

Indicates Direct current.

In This Guide

Guide Organization vii Description of the 58502A Broadband Distribution Amplifier viii Overview viii Auto-Switching and Alarm-Inputs Features viii RS-232C Port and Indicators Features ix Accessories Supplied and Available ix Supplied ix Manuals ix

1Getting Started

58502A Broadband Distribution Amplifier at a Glance 1-2

Preparing the Distribution Amplifier for Use 1-4 To Mount the 58502A Into an Equipment Rack (Using Option

AX4) 1-4 To Connect AC Power 1-5 Connecting a Terminal or Computer to the 58502A 1-5 To Configure Terminal Communications for NT 4.0

Windows To Configure Terminal Communications for Windows

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

Commands That Are Common to All Distribution Applications 1-14

95-Based PC 1-7

Distributing One Input Signal (A or B) 1-12 Distributing Two Input Signals (A and B) 1-12 Distributing Input A and Backup Oscillator (Option 010) Signals 1-13 Distributing of the Backup Oscillator (Option 010) Signal

Only 1-14

Checking the Output Channels Status 1-14 Changing the RS-232 Serial Port Characteristics 1-15

-Based

User’s Guide iii

Contents

2 Performance Tests

Introduction 2-2

Operational Verification 2-2 Performance Tests 2-2 Calibration (Option 010 Only) 2-2 Test Record 2-2 Test Equipment Required 2-4 58502A Operational Verification 2-5 Equipment 2-5 Outputs (1-12) Verification 2-5 Alarm and Status Output Verification 2-7 RS-232 Verification (Optional) 2-9 58502A Performance Tests 2-11 Equipment 2-11 Input Level Response 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 Contents 3-2

Inputs 3-3 AC Input 3-3 INPUTS A and B Ports 3-3 Outputs 3-3 OUTPUTS (1-12) Ports 3-3 ALARM/STATUS Port 3-4

ALARM/STATUS Port Outputs 3-4

ALARM/STATUS Port Inputs 3-5 Indicators 3-6 Power Indicator 3-6

iv User ’s Guide

Contents

Alarm Indicator 3-6 Input A and B Indicators 3-6 OUTPUT STATUS 1-12 Indicators 3-6 Serial Interface Ports 3-7 RS-232 Port 3-7 RS-232 Port Configuration 3-7

Making Changes to the Serial Port Settings (If Needed) 3-8

Determining the Serial Port Settings 3-8 Connecting a Terminal or Computer 3-9 To Connect a Terminal or Computer to the 58502A 3-9 Different Ways to Check Alarm Status 3-11 Configuring the Inputs 3-11 To Configure One Input Operation 3-11 To Configure Two-Input Operation 3-11 To Configure the Internal 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 Commands (Option 010

Only) 4-9 Input Port Status and Setup Commands 4-11 Serial Interface Communication Commands 4-13

5 Functional Description

Introduction 5-2

Functional Block Description of the 58502A 5-3 Controller Block 5-4 Panel LEDs Block 5-4 2-to-1 Switch Block 5-4 1-to-12 Amplifiers and Isolators Block 5-5 Power Supply Module Block 5-5

User’s Guide v

Contents

6Service

Introduction 6-2

Determining 58502A Fault Status 6-2

7 Specifications

Introduction 7-2

Index

vi User’s Guide

In This Guide

This preface contains the following information:

• Guide Organization page vii

• Description of the 58502A Broadband Distribution Amplifier

• Accessories Supplied and Available page ix

• Manuals page ix

Guide Organization

Table of Contents

Chapter 1, “Getting Started,” provides an overview of the 58502A Broadband Distribution Amplifier’s indicators, connectors, inputs, and outputs. This chapter also provides installation, power-up instructions, and sample commands to familiarize you with the 58502A.

page viii

Chapter 2, “Performance Tests,” provides procedures that verify the 58502A operates properly and meets its electrical performance specifications. Electrical performance is tested against the specifications listed in Chapter 7, “Specifications,” 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 the instrument works.

Chapter 6, “Service,” provides information for calibration and troubleshooting to determine if the product should be returned for repair.

Chapter 7, “Specifications,” lists all of the 58502A’s specifications and characteristics.

Index

User’s Guide vii

In This Guide

Description of the 58502A Broadband Distribution Amplifier

Overview

The 58502A is a 1-to-12 Broadband Distribution Amplifier that is used to distribute precision sine wave signals from Cesium, Rubidium, quartz, or GPS frequency standards. It provides 12 outputs of the source frequency, which can range from 100 kHz to 10 MHz, and is designed for site frequency distribution for manufacturing, R&D, and standards lab environments.

In addition, the 58502A may be used as a standalone precision signal source by operating only from its optional internal oscillator.

The 58502A Broadband Distribution Amplifier has low signal distortion and very high isolation between output channels (OUTPUTS 1-12). Low output phase noise also helps maintain the spectral purity of the source input signal, entering the 58502A 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 58502A is compatible with the alarm signals from the 58503A GPS Time and Frequency Reference Receiver and the 5071A Primary Frequency Standard. If the alarm of one of these sources is active, the 58502A switches to the other input source, and it can reflect the alarm in its own alarm outputs and route this information to the ALARM/STATUS port.

Auto switching between two inputs ensures continuous availability of critical frequencies, and a fault alarm is activated when the system is not functioning correctly.

The auto-switching and alarm-inputs features can also be monitored and controlled through the RS-232 serial interface port.

viii User’s Guide

In This Guide

RS-232C Port and Indicators Features

Querying through the RS232 serial interface port and viewing the front-panel LEDs or indicators facilitate monitoring the system. Registers within the 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 number 097-58502-01)

User’s Guide ix

In This Guide

x User’s Guide

Getting Started

Chapter 1 Getting Started

58502A Broadband Distribution Amplifier at a Glance

CAUTION:

METRIC & INCH HARDWARE CONSULT SERVICE MANUAL

OUTPUT STATUS

1 2 3456 7 8 9 10 11 12

AC Input

40 VA Max

100-240 VAC 50/60GHz

ALARM/STATUS

RS232

OUTPUTS

123456789101112

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.

Input

58502A

DISTRIBUTION AMPLIFIER

SYSTEM STATUS

Power Alarm Input

2 1

INPUTS

see into on bottom

5 VRMS MAX

1-2 User’s Guide

Chapter 1 Getting Started

58502A Broadband Distribution Amplifier at a Glance

NOTE See Chapter 3, “Features and Functions,” for a detailed discussion of

the items described below.

1 When the Power indicator lights, it

indicates that the proper input power is supplied to the 58502A.

2 When the Alarm indicator lights, it

indicates that operation is no longer normal. One or more outputs are at fault, or input signals are absent at both inputs A and B.

3 When the Input 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 is a DE-9P (male)

connector. This port allows you to receive an alarm or input an alarm.

8 OUTPUTS 1-12 50Ω BNC output signal

ports.

9 INPUTS A and B 50Ω BNC ports allow

two input signal connections to the 58502A. The internal circuitry selects one of these signals for distribution.

User’s Guide 1-3

Chapter 1 Getting Started

Preparing the Distribution Amplifier for Use

To Mount the 58502A Into an Equipment Rack (Using Option AX4)

1 Position the 58502A on your work surface with the front panel facing

you.

2 As shown in Figure 1-1, place the long side of an angle bracket (1), part

number 58502-00004, with its four mounting holes aligned with the four holes present on the 58502A front side. Note that you may select the four bracket holes appropriate for either a flush or protruding installation.

The angle brackets are provide in the Option AX4 Rack Mount Kit.

58502A

DISTRIBUTION AMPLIFIER

Input

Alarm

Power

Input

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 the instrument in the position it will occupy in the equipment

rack (providing support as required while attaching the mounting hardware). Secure the instrument to the rack with the appropriate hardware.

1-4 User’s Guide

Chapter 1 Getting Started

Connecting a Terminal or Computer to the 58502A

To Connect AC Power

The nominal ac input range is 100-132, 175-240 Vac, 47-63 Hz, 40 VA. The power module or jack senses the incoming voltage and automatically selects the proper setup. Just connect the proper ac power using the supplied power cord.

Connecting a Terminal or Computer to the 58502A

NOTE You may skip this section if you do not plan to use a terminal or

computer; proceed to the power-up procedure, starting on page 1-9. The

58502A may be operated without a terminal or computer. The computer 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 nullmodem cable with DE-9S female connectors at each end) as shown in Figure 1-2.

Terminal or PC

HP 24542U or

F1047-80002

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

RS232

or equivalent

Interface

cable

(DTE)

100-240 VAC 50/60GHz

40 VA Max

Figure 1-2. Connecting a PC or Terminal to the 58502A

2 Turn the terminal or computer on.

If you are using a personal computer (PC), you will need to run a terminal emulation or telecommunication program on your PC in order

User’s Guide 1-5

Chapter 1 Getting Started

Connecting a Terminal or Computer to the 58502A

to communicate via the RS-232 serial port. Most PCs contain a terminal emulation program, especially PCs equipped with Windows. If your PC does not contain a telecommunication program, purchase 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.

If you are using a Windows

-based PC, perform the procedure in the

subsection “To Configure Terminal Communications for Windows

-Based PC” on page 1-8.

1-6 User’s Guide

Chapter 1 Getting Started

Connecting a Terminal or Computer to the 58502A

To Configure Terminal Communications for

NT 4.0

1 In the 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 58502A (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 appropriate port or

connector (COM1 or COM2), then click OK.

/Windows®95-Based PC

The COM1 (or COM2) Properties dialog box is displayed. This dialog box allows you 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 default values listed above.

If an error-number prompt (E-xxx>) or no scpi> prompt is displayed after pressing Return (or Enter) on your PC, the default values of the 58502A have been modified. See the subsections “Making Changes to the Serial Port Settings (If Needed)” and “Determining the Serial Port Settings” on page 3-8 in Chapter 3 for more information.

6 Click OK.

7 Next, perform the power-up procedure described in the section

“Powering Up the Distribution Amplifier” on page 1-9.

User’s Guide 1-7

Chapter 1 Getting Started

Connecting a Terminal or Computer to the 58502A

To Configure Terminal Communications for

Windows

1 Select or double click on the Terminal icon (a picture of a PC with a

telephone in front of it) in the Accessories window.

2 Select Settings, then choose Communications.

A dialog box is displayed 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

-Based PC

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 or connector (COM1, for example).

5 Next, perform the power-up procedure described in the section

“Powering Up the Distribution Amplifier” on page 1-9.

1-8 User’s Guide

Chapter 1 Getting Started

Powering Up the Distribution Amplifier

Overview of the Power-Up Procedure (What to Expect)

When you power up the 58502A Distribution Amplifier for the first time, you should expect it to run through the following sequence:

• front-panel Alarm indicator momentarily flashes, indicating the unit is going through self-test, and

• enters steady-state operation, acting as a twelve-channel distribution amplifier.

To Power Up the Distribution Amplifier

NOTE The 58502A may be operated without a terminal or computer. The

computer is needed for you to remotely monitor the status of the 58502A and to change setup parameters.

1 As shown in Figure 1-3 (note that the terminal or computer 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 Chapter 3, “Features and Functions,” for information on connection and operation for your chosen application.

2 If you are using the Distribution Amplifier with a terminal, personal

computer (PC) see the section “Connecting a Terminal or Computer to the 58502A” starting on page 1-5.

3 Apply the proper power source to the rear-panel AC input jack of the

Distribution Amplifier. (See the subsection “To Connect AC Power” on page 1-5.)

If an input signal is connected to either input A or B, the 58502A should now be distributing the input signal to all 12 output ports.

User’s Guide 1-9

Chapter 1 Getting Started

Powering Up the Distribution Amplifier

HP 24542U,

F1047-80002

or equivalent

Interface

100-240 VAC 50/60GHz

40 VA Max

Input (s)

Outputs

to System

123456789101112

5 VRMS MAX

58502A Distribution Amplifier

RS232

Port

(DTE)

Terminal or PC

cable

(DTE)

Figure 1-3. Inputs and Outputs Connections For Your System (Terminal or PC is Optional)

1-10 User’s Guide

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

Overview

This section provides you with specific program command examples that perform particular tasks. Enter the examples at the scpi> prompt exactly as they appear to avoid creating an error.

If you accidentally make a mistake:

•enter the *CLS command to clear the error queue, then

• re-enter the correct command string at the scpi> prompt.

There are four types of signal distribution 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 1-12.

There are tasks that are common to all distribution applications. These are:

• Checking the Output Channels Status

• Changing the RS-232 Serial Port Characteristics

The example commands to perform these tasks are described in the subsection “Commands That Are Common to All Distribution Applications” starting on page 1-14.

User’s Guide 1-11

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

Setup Commands for the Different Distribution Applications

Distributing One Input Signal (A or B)

To determine which input channel is active:

enter INP:A:QUES?, and press Return,

enter INP:B:QUES?, and press Return.

If 0 is returned, input signal is present. If 1 is returned, input signal is absent. The 58502A will distribute the one signal present regardless of which input channel is 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:SEL A, and press Return.

Enables the A input. Use the query form INP:SEL? to see which input channel is currently in use.

To Select the Input B Channel

Enter INP:SEL B, and press Return.

Enables the B input. Use the query form INP:SEL? to see which input channel is currently in use.

1-12 User’s Guide

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

To Check the Input Channel Automatic Switching Status

Enter INP:SEL:AUTO?, and press Return.

If 0 is returned, automatic switching is disabled. If 1 is returned, automatic switching is enabled.

To Enable the Input Channel Automatic Switching

Enter INP:SEL:AUTO 1, and press Return.

To Disable the Input Channel Automatic Switching

Enter INP:SEL:AUTO 0, and press Return.

Distributing Input A and Backup Oscillator (Option 010) Signals

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 Switching Status

Enter INP:SEL:AUTO?, and press Return.

If 0 is returned, automatic switching is disabled. If 1 is returned, automatic switching is enabled.

To Enable the Input Channel Automatic Switching

Enter INP:SEL:AUTO 1, and press Return.

To Disable the Input Channel Automatic Switching

Enter INP:SEL:AUTO 0, and press Return.

User’s Guide 1-13

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

Distributing of the Backup Oscillator (Option 010) Signal Only

Just apply ac power to the 58502A. After powerup, allow the oscillator to warm up for 5 minutes before using the signal. You do not have to send a command. The oscillator will provide the output signals.

Commands That Are Common to All Distribution Applications

Checking the Output Channels Status

To Use Unpacked Integer to Check Output Channels

Enter OUTP:QUES:UNP?, and press Return.

A string of 12 digits, consisting of 0s and 1s, is returned. The leftmost digit designates channel 1 and the rightmost digit stands for channel

12. A 0 indicates that the associated output is functional, while a 1 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 significant bit = chan 1, next bit = chan 2, and so on. If a bit is 0, the output signal is present. Hence, a value of 0 shows indicates that all outputs are functioning. If there was no output from channels 2 and 3, the response would be: 6 (1*0 + 2*1 + 4*1 + 8*0 + ... = 6).

To Check the Alarm Status

Enter ALAR?, and press Return.

If 0 is returned, alarm is off. If 1 is returned, alarm is on.

To Check for Serial-Port Errors

Enter SYST:ERR?, and press Return.

An integer and quoted string are returned. The first parameter is the error number and the quoted string is the error description.

1-14 User’s Guide

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

To Check Instrument Identification

Enter *IDN?, and press Return.

A quoted identification string is returned, similar to the following:

HEWLETT-PACKARD, 58502A,3426A–00123,3422 – A

To Clear the Error Queue

Enter *CLS, and press Return.

The error message disappears and the scpi> prompt returns.

Changing the RS-232 Serial Port Characteristics

Refer to the subsections “Making Changes to the Serial Port Settings (If Needed)” and “Determining the Serial Port Settings” on page 3-8 in Chapter 3 for complete details and cautions concerning the use of these commands. Always remember to 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 for 7 data bits)

If you need to change one of these, enter the desired parameters appended to the following commands for the stated purpose.

To Turn Off Full-Duplex Communication

Enter SYST:COMM:SER:FDUP 0, and press Return.

To Turn On Full-Duplex Communication

Enter SYST:COMM:SER:FDUP 1, and press Return.

To Check If Full-Duplex Communication is On or Off

Enter SYST:COMM:SER:FDUP?, and press Return.

If 1 is returned, duplex is on. If 0 is returned, duplex is off.

User’s Guide 1-15

Chapter 1 Getting Started

Using Commands to Control Key Functions (Examples)

To Set Baud Rate, Pacing, Parity, and Data Bits

To set the baud rate, for example, 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.

1-16 User’s Guide

Performance Tests

Verifying Specifications

Chapter 2 Performance Tests

Introduction

This chapter provides procedures to test the electrical performance of the 58502A Distribution Amplifier specifications listed in Chapter 7, “This chapter provides electrical specifications and 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.,” of this guide. It also provides calibration procedures for the 58502A units that contain the Option 010 Backup Oscillator.

Three types of testing are provided:

• Operational Verification, starting on page 2-2

• Performance Tests, starting on page 2-2

• Calibration (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 Performance Tests verify the specifications listed in Chapter 7, “Specifications.” All tests can be performed without access to the inside of the instrument.

Calibration (Option 010 Only)

The recommended 58502A calibration period is 12 months. You may perform calibration more often to obtain greater accuracy. This is dependent on the aging rate of the 58502A’s internal reference oscillator and the amount of deviation from the frequency stability needed for your application.

Test Record

The results of the Operational Verification, and Acceptance Test should be recorded on a copy of the Acceptance Test Record, located at the end of this chapter.

2-2 User’s Guide

Chapter 2 Performance Tests

Introduction

User’s Guide 2-3

Chapter 2 Performance Tests

Test Equipment Required

Table 2-1. Recommended Test Equipment

Instrument Required Characteristics Recommended Model Use

Signal Generator Frequency Range: 100 kHz to 10 MHz

Output Level: +6 to +16 dBm Harmonic Distortion:<-30 dBc Spurious Distortion:<-80 dBc

Digitizing Oscilloscope

Universal Counter Frequency Range: 100 kHz to 100

10 MHz Reference Source

Terminal or computer Communication software, RS-232

RMS Voltmeter Accuracy:

50Ω BNC Feedthrough

RS-232 Interface Cable

Frequency range: 100 kHz to 100 MHz HP 54600B (or equivalent) OV

MHz: >10 digits resolution @ 10 MHz

10 MHz Reference Signal Accuracy:

connection

1MHz

_____________________________ HP 10100C (or equivalent) OV, P, C

DTE-to-DTE 9-pin (f) to 9-pin (f) HP 24542U (or equivalent) C

-12

2 X 10

2% at 3V Full Scale,

HP 8663A (or equivalent) OV, P

HP 53131A (or equivalent) C (for

Option 010 only)

HP 5071A (or equivalent) C

Any Model OV, P, C

HP 3400B (or equivalent) P

Type N-to-BNC Connector

50Ω BNC Coaxial Cable (2)

* C= Calibration (Option 010 only)

OV = Operational Verification P = Performance Tests

_____________________________ H P 1250-0780 (or

RG-58, 12 meter, male-to-male HP 10503A (or equivalent) OV, P, C

2-4 User’s Guide

OV, P

equivalent)

Chapter 2 Performance Tests

58502A Operational Verification

These following procedures check the standalone functionality of the 58502A Broadband Distribution Amplifier.

Equipment

• Signal Generator: HP 8663A

• Oscilloscope: HP 54600B

•50Ω BNC Feedthrough: HP 10100C (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.)

• BNC Cables (1 meter, male-to-male)

CAUTION Input amplitude at the 58502A input A or B connector must be below

5 Vrms (+27 dBm) or damage to the Amplifier will occur.

NOTE If any of these 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 this guide, if needed.)

NOTE Once the 58502A Distribution Amplifier has powered on, all that is

required for operation is an input signal connected to either the input A or B, located on the rear-panel.

2 Set the HP 8663A Signal Generator to the following conditions:

Frequency: 10 MHz Wave type: Sinusoidal Amplitude: +10 dBm

The HP 54600B scope has only 1 MΩ input impedance. It does not allow you to switch or set the

impedance to 50Ω.

User’s Guide 2-5

Chapter 2 Performance Tests

58502A Operational Verification

3 Connect the equipment as shown in Figure 2-1. (Connect the Signal

Generator output to the 58502A’s input A or B rear-panel input, and connect oscilloscope Channel 1 to output 1 port of the 58502A.

HP 54600B

HP 8663A Synthesized Signal Generator or equivalent

Output

Oscilloscope or equivalent

N-to-BNC

Connector

(1250-0780)

Input

A or B

BNC Cable

50Ω Feedthrough

(HP 10100C)

Outputs

1 - 12

BNC Cable

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

100-240 VAC 50/60GHz

40 VA Max

Figure 2-1. Operational Verification Setup

4 Verify that the front-panel Input A or B and all twelve OUTPUT

STATUS (1-12) output LEDs are illuminated.

5 Set the oscilloscope to the following:

Channel 1: 0.5 V/div Timebase: 50 ns/div

6 Connect the oscilloscope 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, located on page 2-14.

2-6 User’s Guide

Chapter 2 Performance Tests

58502A Operational Verification

Alarm and Status Output Verification

1 Connect the equipment as shown in Figure 2-2, using output 12 as the

test output. (Note that any one of the outputs can be used for this alarm verification.)

HP 8663A Sythesized Signal Generator or equivalent

Output

100-240 VAC 50/60GHz

40 VA Max

N-to-BNC Connector (1250-0780)

BNC Cable

Input

A or B

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

Figure 2-2. Alarm/Status Output Verification Setup

2 Verify the ALARM/STATUS output function by shorting to ground any

of the outputs (1-12). Let’s use output 12 as shown in Figure 2-3.

1 2 11 12

OUTPUTS

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.

User’s Guide 2-7

Chapter 2 Performance Tests

58502A Operational Verification

Outputs

GND

12345

6789

GND

Figure 2-4. ALARM/STATUS Port

If the Alarm indicator 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.

2-8 User’s Guide

Chapter 2 Performance Tests

58502A Operational Verification

RS-232 Verification (Optional)

NOTE You may skip this verification if you do not plan to use the RS232 port.

1 Apply the proper power source to the rear-panel AC input jack of the

Distribution Amplifier.

2 If you are using 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.

Terminal or PC

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

RS232

Port

Figure 2-5. RS-232 Verification Setup

3 Turn on the PC or terminal.

HP 24542U,

F1047-80002

or equivalent

Interface

cable

100-240 VAC 50/60GHz

40 VA Max

User’s Guide 2-9

Chapter 2 Performance Tests

58502A Operational Verification

4 Set the RS-232 port of your PC to match the following default values:

Pace:NONE

Baud Rate: 9600

Parity: NONE

Data Bits: 8

Stops Bits: 1

If needed, see “Connecting a Terminal or Computer to the 58502A” starting on page 1-5 in Chapter 1 for information 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.

2-10 User’s Guide

Chapter 2 Performance Tests

58502A Performance Tests

These tests verify the specified electrical performance of the 58502A Distribution Amplifier. The tests do not require access to the inside of the instrument and do not test typical specifications or supplementary characteristics.

If the performance test is to be considered valid, the following conditions must be met:

• Instrument being tested is powered on and warmed up.

• Tests are conducted as presented in this section.

• Tests are conducted under normal operating conditions as stated in

Chapter 7, “Specifications.”

• Test equipment 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.)

Input Level Response Tests

A 10 MHz signal is input to the 58502A from a signal generator. The level of this signal is adjusted from +7 dBm to +15 dBm while the twelve Outputs are verified for a 0.707 to 1.12 Vrms signal.

Specifications Tested: 58502A Input Ranges

Minimum Level

Maximum Level

58502A Outputs, 50Ω load

Output Level

+7 dBm

+15 dBm

+13 dBm +1 dB/−3dB

The HP 54600B scope has only 1 MΩ input impedance. It does not allow you to switch or set the

impedance to 50Ω.

User’s Guide 2-11

Chapter 2 Performance Tests

58502A Performance Tests

Test 1: +7 dBm Input Level

1 Apply power to the 58502A and observe successful completion of

self-test.

2 Set the signal generator to:

FREQUENCY: 10 MHz LEVEL: +7 dBm

3 Connect the signal generator output to the 58502A input A or B rear-

panel input connector as shown in Figure 2-6.

4 Connect the RMS voltmeter via the 50

load to the 58502A Output 1

Ω

as shown in Figure 2-6.

HP 8663A Synthesized Signal Generator or equivalent

Output

N-to-BNC

Connector

(1250-0780)

Input

A or B

5 VRMS MAX

50Ω Feedthrough

BNC Cable

123456789101112

(HP 10100C)

Outputs

1 - 12

Figure 2-6. Input Level Response Test Setup

5 Set the RMS voltmeter to 3V Full Scale Range.

HP 3400B RMS Voltmeter or equivalent

BNC Cable

58502A Distribution Amplifier

100-240 VAC 50/60GHz

40 VA Max

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.

2-12 User’s Guide

Chapter 2 Performance Tests

58502A Performance Tests

Test 2: +15 dBm Input Level

1 Using the same test setup (see Figure 2-6) and the RMS voltmeter 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.

User’s Guide 2-13

Chapter 2 Performance Tests

58502A Performance Test Record (Page 1 of 2)

Model 58502A Broadband Distribution Amplifier

Serial Number:_______________________________ Repair/Work Order No.__________________

Test Performed By:___________________________ Temperature:___________________________

Date:________________________________________ Relative Humidity:______________________

Notes: ______________________________________________________________________________

Line Number Operational Verification Test Results

Pass Fail

1 Outputs (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. ________________________ < 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. _______________________ < 1.12 Vrms

0.707 Vrms < 11. _______________________ < 1.12 Vrms

0.707 Vrms < 12. _______________________ < 1.12 Vrms

2-14 User’s Guide

Chapter 2 Performance Tests

58502A Performance Test Record (Page 2 of 2)

58502A Performance Tests (Continued)

Input Level Response Tests (Continued)

Test 2: +15 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. ________________________ < 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. _______________________ < 1.12 Vrms

0.707 Vrms < 11. _______________________ < 1.12 Vrms

0.707 Vrms < 12. _______________________ < 1.12 Vrms

User’s Guide 2-15

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)

This section provides procedures to perform routine periodic calibration of the Option 010 Broadband Distribution Amplifier.

Overview

The following procedure uses software commands to calibrate the oscillator.

NOTE The optional oscillator of the 58502A has a specified aging rate of

±5×

−10

per day (±1×10−7/year). Refer to the specifications in Chapter 7 to ensure that the 58502A oscillator has warmed up for a sufficient 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 the software, SCPI-based EFC adjust that has a control range of

10−6 maximum with a minimum resolution of 4×10

−12

The software EFC control range is mapped onto a numerical range of values as follows:

Minimum: 0 Maximum: 1,048,575 (2

-1) Mid-Range: 524,288 Default Step Size: 10,000 Minimum Step Size: 1 Maximum Step Size (LIMIT ON): 35,000

2-16 User’s Guide

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)

Equipment

• 10 MHz Primary Frequency or House Standard: HP 5071A (or equivalent)

• Terminal or computer (PC): Any Model with communication software and RS-232 connection

• HP 53131A Universal Counter (or equivalent)

• HP 24542U (or F1047-80002) (or equivalent) Serial Interface Cable

• HP 10100C 50Ω BNC Feedthrough (or 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 Figure 2-7.

2 Connect any output of the 58502A to the Counter’s input as shown in

Figure 2-7.

3 Set the Counter’s gate time to 1-second to display at least 10 digits

(10,000,000.000).

User’s Guide 2-17

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)

10 MHz External

Reference Out

HP 5071A Primary Frequency Standard or equivalent

5071A

PRIMARY FREQUENCY STANDARD

To any

available

Output

Continuous Operation

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

Outputs

1 - 12

Port1

BNC Cable

HP 24542U

Interface

cable

or equivalent

100-240 VAC 50/60GHz

40 VA Max

BNC Cable

HP 53131A Universal Counter or equivalent

Terminal or PC

Ref. In 50Ω Feedthrough (HP 10100C)

Channel 1

RS232C

Port

Figure 2-7. 58502A Calibration Setup

4 Observe Counter reading.

−

If difference from 10 MHz is

<5 ×

(0.5 Hz), then perform the

“Software Oscillator Adjustment” procedure below.

Software Oscillator Adjustment

1 Use the terminal and serial port to send the following SCPI command

to ascertain the EFC value currently applied:

DIAG:CAL:ROSC:EFC:ABS?

2-18 User’s Guide

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)

2 Use the terminal and serial port to send one of the following SCPI

commands to incrementally adjust the EFC control signal to bring the oscillator frequency closer to 10 MHz:

DIAG:CAL:ROSC:EFC:ABS UP (or) DIAG:CAL:ROSC:EFC:ABS DOWN

Where UP increases frequency and DOWN decreases frequency.

3 As you approach 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 ×

(0.01 Hz).

5 Record the date, EFC value, and frequency value on the Calibration

recorded, located on page 2-20.

6 Return the EFC step size to its original value by sending the following

SCPI command:

DIAG:CAL:ROSC:EFC:ABS:STEP 10000

This completes the 58502A calibration.

User’s Guide 2-19

Chapter 2 Performance Tests

Calibration Record (Page 1 of 1)

Model 58502A Option 010 Broadband Distribution Amplifier

Serial Number: ___________________________ Repair/Work Order No. _________________

Test Performed By: _______________________ Temperature: __________________________

Date: _____________________________________ Relative Humidity: ____________________

Notes: ___________________________________________________________________________

Calibration Dates and Values

Date

10.

11.

12.

EFC Value Frequency or Frequency Difference

2-20 User’s Guide

Features and Functions

Chapter 3 Features and Functions

Chapter Contents

You will find that this chapter makes it easy to look up all the details about a particular feature of the 58502A Broadband Distribution Amplifier.

This chapter is organized as follows:

• Inputs page 3-3

– AC Input page 3-3

– INPUTS A and B Ports page 3-3

• Outputs page 3-3

– OUTPUTS (1-12) Ports page 3-3

– ALARM/STATUS Port page 3-4

• Indicators page 3-6

– Power 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

• Different Ways to Check Alarm Status page 3-11

• Configuring the Inputs page 3-11

– To Configure One Input Operation page 3-11

– To Configure Two-Input Operation page 3-11

– To Configure the Internal Oscillator as a Backup

(Option 010) Input

– To Configure the Internal Oscillator as the Only

Source Input (Option 010)

page 3-9

page 3-12

3-2 User’s Guide

Chapter 3 Features and Functions

Inputs

~AC Input

100-240 VAC 50/60GHz

40 VA Max

INPUTS

5 VRMS MAX

AC Input

This rear-panel ac power module or jack senses the incoming voltage and automatically selects the proper setup. The nominal ac input range is 100-132, 175-240 Vac, 47-63 Hz, 40 VA.

INPUTS A and B Ports

These rear-panel 50Ω BNC input connectors or ports allow two-input signal connection to the 58502A. These ports will accept sinusoidal signals, ranging from 100 kHz to 10 MHz with power level of +7 to +15 dBm.

These ports form a 2-to-1 auto-switch. When the 58502A detects that one of its inputs is removed or the amplitude of the input is greatly reduced, it will automatically switch to the other input. Thus, the auto-switch feature ensure your critical frequencies are always present.

Only one input is used at a time. Factory default is set to input A over B if valid 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.

1 2 11 12

OUTPUTS

Outputs

OUTPUTS (1-12) Ports

These twelve 50Ω BNC, rear-panel connectors or ports allow distribution of sinusoidal with very low phase noise and signal distortion. The isolated output signals are derived from a single sine wave input signal, from input A or B. The outputs have fixed and identical characteristics, and retain the integrity (that is, frequency, amplitude, phase, etc.) of the input signal. The state of each distributed output signal is communicated via the front-panel indicators or LEDs, and can be monitored at the ALARM/STATUS port.

User’s Guide 3-3

signals (ranging from 100 kHz to 10 MHz)

Chapter 3 Features and Functions

Outputs

ALARM/STATUS

RS232

ALARM/STATUS Port

This DE-9P (male) subminiature D connector or port allows you to monitor the status of the 58502A via pins 2, 3, and 4 (see Table 3-1). This port also allows you to receive compatible BITE (Built In Test Equipment) alarm inputs from the 58503A GPS Time and Frequency Reference Receiver and the HP 5071A Primary Frequency Standard via pins 6 and 7.

The pin assignments are described in Table 3-1.

Table 3-1. ALARM/STATUS Port Pin Assignments

Pin Number

1, 5, 9 GROUND Signal return, ground potential.

2, 3, 4 ALARMS OUT TTL

6, 7 ALARMS IN TTL

8 ________________ Do not use or ground.

See the section “Different Ways to Check Alarm Status,” which discusses three different ways you can check the alarm status of the 58502A.

Signal Description

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.

Alarm Outputs

ALARM/STATUS

12345

6789

Figure 3-1. Alarm Outputs

All of the output pins are at a TTL high when there is no alarm condition. When an alarm condition exists, all of the output pins drop to a TTL low. These outputs echo the state of front-panel Alarm indicator.

3-4 User’s Guide

Chapter 3 Features and Functions

Outputs

ALARM/STATUS Port Inputs

The input pins (6 and 7) of this port are shown in Figure 3-2. The input pins are a TTL high (3.5 Vdc, minimum) when operation is normal, and TTL low (1.5 Vdc, maximum) if there is an alarm.

ALARM/STATUS

12345

6789

Alarm Inputs

Figure 3-2. Alarm Inputs

Always connect the input A input device to pin 6 of the ALARM/STATUS connector, and connect the input B input device to

pin 7. Do NOT use or ground pin 8.

When an alarm input from the device connected to input A is received by the 58502A, the 58502A switches to using the backup signal (input B) as the source signal, and automatically reflects the alarm in its own alarm outputs and routes this information to pin 6 of the ALARM/STATUS connector. Conversely, similar actions occur when an alarm input from the device connected 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 Standard signal to input A, and connected the 58503A GPS Receiver signal to input B. Then you connected the HP 5071A status output to pin 6 of the ALARM/STATUS port, and the 58503A alarm output to pin 7. (The common or return for these signals should be connected to pin 9, ground. You need to make a special cable for these connections.)

If the HP 5071A fails and sends an alarm, the 58502A will automatically switch to the backup input signal from the 58503A on input B. Using INP:ALARM? query would return 1,0,0, indicating that the alarm occurred in the device connected to pin 6.

User’s Guide 3-5

Chapter 3 Features and Functions

Indicators

SYSTEM STATUS

Power Alarm InputAInput

1 2 3456 7 8 9 10 11 12

OUTPUT STATUS

Power Indicator

This indicator lights when the input power is supplied to the 58502A. The indicator cannot be set or queried via the serial interface.

Alarm Indicator

This indicator lights when an alarm is detected in the distribution system. 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 associated outputs are functioning.

3-6 User’s Guide

Chapter 3 Features and Functions

Serial Interface Ports

ALARM/STATUS

RS232

RS-232 Port

This 9-pin male subminiature D (DE-9P) rear-panel connector is a RS-232 DTE configuration serial interface port. It allows serial interface connection to an external computer for remote operations.

This serial interface port allows you to remotely control and monitor the 58502A.

See the section “Connecting a Terminal or Computer” starting on page 3-9 for information on interface cable use.

RS-232 Port Configuration

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.

Parameter Default Command Possible Choices

Software Pacing NONE SYST:COMM:SER:PACE XON or NONE

Baud Rate 9600 SYST:COMM:SER:BAUD 1200, 2400, 9600, or 19200

Parity NONE SYST:COMM:SER:PAR EVEN, ODD, or NONE

Data Bits 8 SYST:COMM:SER:BITS 7 or 8

Stops Bits 1 No command exists Fixed (no choices available)

Full Duplex ON SYST:COMM:SER:FDUP ON or OFF

Procedures for configuring the RS-232 ports are provided in the following subsections.

User’s Guide 3-7

Chapter 3 Features and Functions

Serial Interface Ports

Making Changes to the Serial Port Settings (If Needed)

CAUTION If you change the serial port settings, your changes will be

stored in the 58502A. Cycling power will not reset to factory defaults. Therefore, if you make a change, it is recommended that you record the settings and keep the record with the 58502A.

If you need to change the serial port settings, for example, to set up for a different computer, use the guidelines given in this section.

Serial port settings are changed by issuing commands.

It is recommended that you issue a single compound command which simultaneously sets all the serial port parameters. Then connect the other computer and begin using the instrument with the new settings.

NOTE If you choose to set parameters one at a time, you will make the

procedure more difficult. That is, with each change, the instrument will be updated, but your computer 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:COMM:SER:PACE XON; BAUD 2400; PARITY EVEN

Determining the Serial Port Settings

If you connect your PC, press Return, and do not get a scpi> prompt back from the 58502A, your 58502A’s serial communication settings may have been modified. You need to systematically step through the data communication settings on your PC until your PC matches the 58502A. The 58502A cannot communicate its settings until this process is complete.

Iterate until you are able to verify that settings on your PC match the 58502A.

When you are successful, you will have restored full RS-232 communications, enabling you to query the 58502A’s communication settings. Once you establish communications with the serial port, you can query the 58502A for settings of the port.

3-8 User’s Guide

Chapter 3 Features and Functions

Connecting a Terminal or Computer

Issue the following queries to the serial port to verify its configuration.

SYST:COMM:SER:PACE? SYST:COMM:SER:BAUD? SYST:COMM:SER:PARITY? SYST:COMM:SER:BITS? SYST:COMM:SER:SBITS?

Connecting a Terminal or Computer

To connect the 58502A to a terminal or computer, you must have the proper interface cable. Most computers are DTE (Data Terminal Equipment) devices. Since the 58502A is a DTE device, you must use a DTE-to-DTE interface cable when connecting to a computer. These cables 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 shell.

To simplify interface cable selections, the following subsections tell you which cables to use.

To Connect a Terminal or Computer to the 58502A

Use an HP 24542U interface cable (or equivalent RS-232 null-modem cable with DE-9S female connectors at each end) to connect the 58502A’s rear-panel RS232 port to a terminal or computer as shown in Figure 3-3.

User’s Guide 3-9

Chapter 3 Features and Functions

Connecting a Terminal or Computer

HP 24542U,

F1047-80002

58502A Distribution Amplifier

123456789101112

5 VRMS MAX

RS232

Port

(DTE)

or equivalent

Interface

100-240 VAC 50/60GHz

40 VA Max

Terminal or PC

cable

(DTE)

Figure 3-3. Connecting a PC or Terminal to the 58502A

3-10 User’s Guide

Chapter 3 Features and Functions

Different Ways to Check Alarm Status

The 58502A provides three ways to check its alarm status: visually viewing the front-panel indicators, querying for status via the RS232 port, and monitoring the ALARM/STATUS port.

Configuring the Inputs

The 58502A Broadband Distribution Amplifier can be manually operated, or operated with a computer or terminal for enhanced features.

The 58502A can be manually operated in all four modes of operation as described in the following paragraphs.

To Configure One 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 signal will appear on all twelve outputs.

NOTE 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.

User’s Guide 3-11

Chapter 3 Features and Functions

Configuring the Inputs

To Configure the Internal Oscillator as a Backup (Option 010)

Connect the input signal to input A . Then connect the 58502A to ac power. The internal oscillator will provide the source signal for the 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 oscillator to warm up for at least 5 minutes before using the signals.

3-12 User’s Guide

Command Reference

Chapter 4 Command Reference

Chapter Contents

This chapter provides a description for each command that can be used to operate the 58502A Broadband Distribution Amplifier.

This 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)

• Input Ports Status and Setup Commands page 4-11

• Serial Interface Communication Commands page 4-13

page 4-9

4-2 User’s Guide

Chapter 4 Command Reference

SCPI Conformance Information

The Standard Commands for Programmable Instruments (SCPI) commands used in the 58502A are in conformance with the SCPI Standard Version 1992.0.

Command Syntax Conventions

[ ]

1 | 2

<numeric_value>

POSition

<n>

An element inside brackets is optional. Note, the brackets are NOT part of the command and should not be sent to the instrument.

Means use either 1 or 2.

Means enter a number.

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 keywords.) In other words, the short form of the keywords is shown in uppercase.

The notation <n> ending a command keyword indicates a numeric suffix, used to differentiate multiple instances of the same structure. The numeric suffix is applied to both the short and long forms. The valid range for the value n is specified from an enumerated list, for example [1|2|3], or from a range, for example [1..3] to indicate any of the integers from 1 to 3.

"TSTamp 1"

When you see quotation marks in the command’s parameter, you must send the quotation marks with the command.

IEEE 488.2 Common Commands

The Common Commands are general purpose commands that are common to all instruments (as defined in IEEE 488.2). Common Commands are easy to recognize because they all begin with an asterisk or star “*” (for example, *CLS, *IDN?). These commands are generally not related to measurement configuration. They are used for functions like clearing alarms or errors, identification, or setting alarm enables.

User’s Guide 4-3

Chapter 4 Command Reference

58502A Command Summary

Table 4-1 lists and briefly defines all of the commands that can be used to operate the 58502A.

Table 4-1. 58502A Command

Keyword/Syntax Parameters Description

*CLS Clears error queue.

*IDN? returns unquoted

string

:ALARm? returns 0 or 1 0 = alarm is off, 1 = alarm is on. Alarm is on when any of the

DIAGnostic

:CALibration Node Only

:ROSCillator Node Only

:EFC Node Only

:ABSolute

:ABSolute?

:STEP <EFC increment

:STEP? returns <EFC

INPut

:A:QUEStionable? returns 0 or 1 Reports if there is a signal present on input A.

:B:QUEStionable? returns 0 or 1 Reports if there is a signal present on input B.

:ALARm? 0,0,0 or 1,0,0 or

:SELect A or B Enables either Input A or Input B. Use the query form to see

Send: <EFC value> or UP or DOWN

returns: <EFC value>

value>

increment value>

0,1,0

Returns identification string.

outputs are not functional. (There may be additional internal conditions that generate alarm.)

Diagnostic Subsystem (USED WITH OPTION 010 ONLY)

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 (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.

Increments the EFC value by this amount.

Query.

INPUT Subsystem

0 = signal present 1 = no signal present.

0 = signal present (not questionable), 1 = no signal present.

Reports the alarm status of devices connected to the input pins (6, 7) of the ALARM/STATUS port. 0, 0,0 = no alarm exists. 1, 0,0 = alarm from input A devices connected to pin 6. 0,1, 0 = alarm from input B devices connected to pin 7.

which input is currently in use. This command also disables auto-switching.

Summary

4-4 User’s Guide

Chapter 4 Command Reference

58502A Command Summary

Table 4-1. 58502A Command Summary

Keyword/Syntax Parameters Description

INPut (Continued)

:AUTO

:AUTO?

:DEFault

:DEFault?

OUTPut:QUEStionable

:PACKed? returns binary

[:UNPacked]? returns array of

[SOURce]:ROSCillator

:WARM? 0 or 1 Reports if internal oscillator is warmed up.

SYSTem

:COMMunicate:SERial Node Only

:FDUPlex 0 or 1 Sets duplex. (0 = echo Off, 1 = echo On).

[:RECeive] | TRANsmit Node Only. There is a single setting of commands under this

:BAUD <numeric> Sets the BAUD rate (1200, 2400, 9600, 19200).

:BITS? 7 or 8 Returns Data Bits set by PARity (7 for odd/even, 8 for none).

:PACE XON | NONE Sets flow control. (On or None).

:PARity Node Only.

[:TYPE] EVEN | ODD |

:ERRor? returns integer,

append 0 or OFF, or

1 or ON

returns 0 or 1

A or B

returns A or B

weighted decimal

Boolean

NONE

quoted string

INPUT Subsystem (Continued)

Enables or disables the automatic input switching feature. 0 or OFF disables it while 1 or ON enables it. This setting is stored in non-volatile memory. Query.

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 in non-volatile memory. Query.

OUTPut:QUEStionable Subsystem

Provides 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. If bit is 0, output signal is present. Hence value of 0 indicates that all outputs 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)

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 outputting the source signal, the response would be: 0,0,1,0,1,0,0,0,0,0,0,0

ROSCillator Subsystem (USED WITH OPTION 010 ONLY)

0 = not warm. 1 = warm.

SYSTem Subsystem

node for both transmit and receive. Default values are in italics.

Sets parity. (Odd, Even, or None).

First parameter is error number, quoted string is error description.

(Continued)

User’s Guide 4-5

Chapter 4 Command Reference

System Status Reporting Commands

*CLS

This command clears the error queue.

ALARm?

This query returns alarm status of the 58502A.

Returns a single character, 0 or 1.

A value of 0 indicates alarm is off; a value of 1 indicates alarm is on.

If any of the outputs are not functional or there is an input alarm

(there may 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 +0, output signal is present. Hence value of +0 indicates that all outputs are outputting the source signal. If there was no output from outputs 2 & 3, the response would be:

+6 (1*0 + 2*1 + 4*1 + 8*0 + ... = 6)

4-6 User’s Guide

Chapter 4 Command Reference

System Status Reporting Commands

OUTPut:QUEStionable[:UNPacked]?

This query returns the status on each output (lowest numbered output to highest).

Returns array of 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 number.

User’s Guide 4-7

Chapter 4 Command Reference

Identification Command

*IDN?

This query returns the 58502A identification.

A sequence of ASCII-encoded bytes:

HEWLETT-PACKARD, 58502A, XXXXY–ZZZZZ, WWWW – V

where 58502A is the product model number, XXXXYZZZZZ is the 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 instrument

within a series.

For example,

HEWLETT-PACKARD, 58502A, 3752A–00123,3422 – A

4-8 User’s Guide

Chapter 4 Command Reference

Internal Oscillator Calibrating and Status Commands (Option 010

Only)

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.

User’s Guide 4-9

Chapter 4 Command Reference

Internal Oscillator Calibrating and Status Commands (Option 010

Only)

[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.

4-10 User’s Guide

Chapter 4 Command Reference

Input Port Status and Setup Commands

INPut:A:QUEStionable?

This query reports if there is a signal present on input A.

Returns a single character, 0 or 1.

A value of 0 indicates signal is present (not questionable).

A value of 1 indicates no signal is present.

INPut:B:QUEStionable?

This query reports if there is a signal present on input B or backup oscillator (Option 010).

Returns a single character, 0 or 1.

A value of 0 indicates signal is 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 pin 7.

An example of how to use and interpret the alarm inputs is given on page 3-5 in Chapter 3 of this guide.

INPut:SELect A | B

This command selects either input A or input B or backup oscillator (Option 010) as the input channel. This command also disables auto-switching.

Use A or B to select the appropriate input port.

User’s Guide 4-11

Chapter 4 Command Reference

Input Port Status and Setup Commands

INPut:SELect?

This query indicates which input is selected as the source input.

Returns single character, A or B.

INPut:SELect:AUTO 0 | 1

This command enables or disables the automatic input switching feature.

This setting is stored in non-volatile memory.

Use 0 (OFF) to disable auto-switching.

Use 1 (ON) to enable auto-switching.

INPut:SELect: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 in non-volatile memory.

Use A or B to select the appropriate power-up default input port.

INPut:SELect:DEFault?

This query returns default input channel (or port) to be used at powerup.

Returns single character, A or B.

4-12 User’s Guide

Chapter 4 Command Reference

Serial Interface Communication Commands

SYSTem:COMMunicate:SERial:BAUD <numeric_value>

This command sets the baud rate of the RS-232 port.

The possible baud rate values that can be entered are 1200, 2400, 9600, or 19200.

The baud rate value is stored in non-volatile memory. It is unaffected by powerup.

SYSTem:COMMunicate:SERial:BAUD?

This query returns the baud rate value of RS-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 the characters you type (i.e., when typing a command, the ON state allows you to see on the computer screen the characters you type).

OFF disables the echoing of the characters you type.

The duplex state is stored in non-volatile memory. It is unaffected by powerup.

User’s Guide 4-13

Chapter 4 Command Reference

Serial Interface Communication Commands

SYSTem:COMMunicate:SERial:FDUPlex?

This query returns the duplex state of the RS-232 port.

Returns a single character, 0 or 1.

A value of 0 indicates echo is OFF; a value of 1 indicates echo is ON.

SYSTem:COMMunicate:SERial:PACE XON | NONE

This command sets flow control of the RS-232 port.

The choices are XON or NONE.

The software pacing or flow control 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 enabled, the 58502A sends/receives 7 data bits plus 1 parity bit. If parity is disabled, the 58502A sends/receives 8 data bits.

SYSTem:COMMunicate:SERial:PARity?

This query returns the parity setting of the RS-232 port.

Returns EVEN, ODD, or NONE.

4-14 User’s Guide

Functional Description

Chapter 5 Functional Description

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.

5-2 User’s Guide

Chapter 5 Functional Description

Functional Block Description of the 58502A

The 58502A electronic circuits consist of five primary blocks:

• Controller

• Panel 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.

RS-232

Alarm input

Input A

Input B

Power

(AC )

input select

2- to -1

Switch

Power

Supply

Module

Controller

+5 Vdc

+15 Vdc

-15 Vdc

Figure 5-1. Simplified Block Diagram

output condition

1- to -12

Amplifiers

and

Isolators

status

Alarm/status

Output 1

Output 2

Output 12

Panel LEDs

User’s Guide 5-3

Chapter 5 Functional Description

Functional Block Description of the 58502A

Controller Block

This block provides remote instrument management via commands transferred through the RS-232 serial port. It also provides hardware output alarm signals via the Alarm/Status connector that go active when the controller block lights the front-panel system status alarm indicator. Alarm inputs are received and processed by the controller block.

The block consists of a microprocessor and associated support circuitry that together facilitate control of all internal housekeeping, command actions, diagnostic, and system status instrument functions. All instrument functions are controlled and/or monitored by this block.

Panel LEDs Block

This block consists of hardware that provides visual indicators for the operating status of instrument power, system alarm, inputs A and B, and distribution amplifier channels 1 through 12. During normal operation 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 extinguished and the alarm indicator will illuminate.

2-to-1 Switch Block

This block consists of inputs A and B routed to a programmable switch that provides a single output to the input of the 1-to-12 Amplifiers and Isolators block. Input selection switching for this block is controlled by the input select line that arrives from the controller block.

The controller block input select line state (at power on from the factory) selects input A over B, if valid signals are present at both connectors, but will switch to input B automatically, if the signal at input A fails. If input B fails and input A signal reappears, the controller block will select input A again as the valid input signal source. If both inputs fail, no select line state change will occur.

5-4 User’s Guide

Chapter 5 Functional Description

Functional Block Description of the 58502A

1-to-12 Amplifiers and Isolators Block

This block consists of twelve separate individual isolation amplifiers that accomplish the distribution of the source frequency (ranging from 100 kHz to 10 MHz) into twelve available output channels with very low phase noise and signal distortion at the rear-panel output BNC connectors. In addition, each output 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 condition signal line.

Power Supply Module Block

This block provides +5, +15, and -15 Vdc to all other blocks in the instrument. When ac power is used, it provides fuse protection, steps down, rectifies, filters, regulates, and distributes internal dc power.

User’s Guide 5-5

Chapter 5 Functional Description

Functional Block Description of the 58502A

5-6 User’s Guide

Service

Chapter 6 Service

Introduction

This chapter provides the information required to determine if the 58502A Broadband Distribution Amplifier is faulty.

Determining 58502A Fault Status

Use the following procedure to determine fault status of the 58502A Distribution Amplifier.

1 Perform the Power-on Self test as described in Chapter 1, “Getting

Started,” of this guide.

If self test passes, go to step 2.

If the test fails, go to step 5.

2 Verify RS-232 serial-port setup and operation as described 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 Performance Tests” in Chapter 2, “Performance Test,” of this guide.

If the performance tests pass, Re-check all system input signals and output loads connected to the 58502A and troubleshoot them as required.

If performance tests fail, go to step 5.

5 If any combination of steps 1 through 4 fail, return the instrument

for service.

6-2 User’s Guide

Specifications

Chapter 7 Specifications

Introduction

This chapter provides electrical specifications and 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.

7-2 User’s Guide

Chapter 7 Specifications

Introduction

Electrical Specifications

Input, A or B

Frequency Range: 0.1 MHz to 10 MHz Impedance: 50Ω nominal

SWR <1.5

Amplitude: +15 dBm maximum

+7 dBm minimum

Connector: BNC (female)

Outputs (into 50Ω)

Amplitude: +13 dBm, +1 dB/−3 dB Harmonics: <−32 dBc

(for Option 010): <−20 dBc

Spurious: <−110 dBc, <−113 typical

(for Option 010): <−80 dBc

Connector: BNC (female)

Mechanical Specifications

Weight: 2.95 kg Shipping Weight: 6.35 kg Dimensions: Height: 45 mm

Width: 426 mm Depth: 344 mm

Supplemental Characteristics

Outputs

Single Sideband Phase Noise (1 Hz bandwidth) Offset Frequency Phase Noise 100 Hz <−127 dBc/Hz 1 kHz <−142 dBc/Hz 10 kHz <−148 dBc/Hz

Port-to-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

Connector: DE-9P (male) Normal State: TTL High Alarm State: TTL Low

Output Configuration: Open-collector output,

10kΩ pull-up to 5 Vdc

Power Requirements

AC Input: 100–132 or

175–240 Vac 47–63 Hz 80 VA Max

Available Options

Option 010: Internal Backup Oscillator

(10 MHz Precision Oven Controlled Quartz Crystal)— replaces Input B

Stability: Temperature Stability: 6 × 10 Aging/Day: 5 × 10 Aging/Year: 1 × 10 Tuning Range: 7 × 10−7 (minimum)

Option AX4: Rack Mount Kit

−9

(0° C to +55° C)

−10

−7

User’s Guide 7-3

Chapter 7 Specifications

Introduction

7-4 User’s Guide

Index

SYSTEem

COMMunicate

SERial1

BAUD?, 4-13

SYSTem

COMMunicate

BAUD?, 4-13 BITS?, 4-13 FDUPlex?, 4-14 PACE?, 4-14 PARity?, 4-14

SERial

BAUD, 4-13 FDUPlex?, 4-14 PACE, 4-14 PACE?, 4-14

SERial1

BITS?, 4-13 FDUPlex, 4-13 PARity, 4-14 PARity?, 4-14

SYMBOLS

(PORT†2, 4-13, 4-14

, 4-6

*CLS

, 4-8

*IDN? commands

OUTPut

QUEStionable

OUTPut:QUEStionable

, 4-7

NUMERICS

183, 4-8

AC Input jack, 1-3 ac power alarm checking Alarm indicator alarm signals alarm status alarm system

ALARM/STATUS port ALARm? alarm-inputs feature

, 1-5, 5-5

, 3-4, 3-6

, 3-4, 3-11

how it works

, 4-6

, 4-7

, 3-11

, 1-3, 3-6

, 3-5

, viii

, 4-7

, 1-3, 3-4

auto-switch feature auto-switching feature

, viii

baud, 4-13 baud rate

, 3-7

calibration record, 2-20 Cesium channel

channels

circuit description

command

command summary table command syntax conventions commands

, viii

inputs

input A, 3-3 input B outputs twelve outputs

block level, 5-3

common

*CLS, 4-6 *IDN? ALARm? DIAGnostic:CALibration:ROSCillator:

DIAGnostic:CALibration:ROSCillator:

examples INPut

INPut:A:QUEStionable? INPut:ALARM? INPut:SELect INPut:SELect:AUTO INPut:SELect:AUTO? INPut:SELect:DEFault INPut:SELect:DEFault? INPut:SELect? OUTPut:QUEStionable:PACKed? OUTPut:QUEStionable:UNPacked? 4-7 reference ROSCillator:QUEStionable? ROSCillator:WARM? SCPI

, 3-3

, viii

, 3-3

, 4-2

, 4-4

, 4-8

, 4-6

EFC:ABSolute, 4-9

EFC:ABSolute:STEP, 4-9

EFC:ABSolute:STEP?

EFC:ABSolute?, 4-9

, 1-11

B:QUEStionable?, 4-11

, 4-11

, 4-12

, 4-2

, 4-9

, 4-11

, 4-12

, 4-10

, 4-3

, 4-9

, 4-6

User’s Guide Index-1

Index

SYSTem:COMMunicate:SERial:BAUD

, 4-13

SYSTem:COMMunicate:SERial:BAUD

?, 4-13

SYSTem:COMMunicate:SERial:BITS?

4-13

SYSTem:COMMunicate:SERial:FDUP

, 4-13

lex

SYSTem:COMMunicate:SERial:FDUP

lex?, 4-14

SYSTem:COMMunicate:SERial:PACE

4-14

SYSTem:COMMunicate:SERial:PACE

, 4-14

SYSTem:COMMunicate:SERial:PARit

y, 4-14

SYSTem:COMMunicate:SERial:PARit

y?, 4-14

SYSTem:ERRor?

, 4-7

communication, serial interface

port, 4-13, 4-14

communications

, 1-5

SCPI TIME OF DAY

, 1-5

computer

connecting PC

, 1-5

terminal

, 3-9

, 1-5

configuration

RS-232 port, 3-9

configuration of RS-232 port

, 3-7

configure terminal communications configuring serial port configuring the inputs

, 1-7 , 3-11

connecting

computer, 3-9

terminal connecting to a computer connecting to computer connecting to terminal

, 3-9

, 1-9

, 1-5

connector

A and B, 1-3

AC Input

ALARM/STATUS

OUTPUTS (1-12)

RS-232

, 1-3

, 1-3, 3-4

, 1-3

, 1-3, 3-7

conventions

command syntax, 4-3

data bits, 3-7, 4-13 Data Terminal Equipment default values

, 1-7, 1-8, 2-10

description

commands

, 4-2

description of HP 58502A

, 3-9

, viii

, 1-6

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?

DTE device

, 3-9

DTE-to-DTE interface cable

DTE-to-DTE interface cable duplex state

, 4-13, 4-14

, 4-9

, 3-9 , 3-9

echoing of the characters you type, 4-13,

4-14

electrical specifications

, 7-2

equipment

required test

example commands

, 2-4

, 1-11

factory default values

RS-232 port

serial port FDUPlex features features and functions flow control state frequency standard

, 3-7

, 4-13, 4-14

, viii, ix

, 3-1

, 4-14

, viii, 3-6

GPS frequency standard, viii GPS receiver

, 3-6

HP 5071A Primary Frequency

Standard

HP 58503A GPS Receiver

, 3-6

indicator

Input A

Input B

OUTPUT STATUS 1-12

Power indicators

Alarm

Input A

Input B

OUTPUT STATUS (1-12)

Power INPut

B:QUEStionable?, 4-11 input

channels Input A indicator

, 3-6 , 3-6

, 3-6

, 1-3

, 1-3 , 1-3

, 1-3

, 3-3

, 1-3

Index-2 User’s Guide

Index

Input B indicator, 1-3 input channel input channels Input Level Response Test input ports input A input A Input A indicator input B Input B indicator INPut:A:QUEStionable? INPut:ALARM? INPut:SELect INPut:SELect:AUTO INPut:SELect:AUTO? INPut:SELect:DEFault INPut:SELect:DEFault? INPut:SELect?

, 4-5

, viii

, 2-11

, viii

, 3-3

, 3-6

, viii, 3-3

, 3-6

, 4-11

, 4-12

inputs

A and B ac input configuration

INPUTS A and B connectors

, 1-3, 3-3

, 3-3

, 3-11

, 1-3

installing rack mount

rack mount

installation

interface cables

, 1-4

, 3-9

interface port

RS-232 RS-232

, 3-7 , 1-3

jack

AC Input

, 1-3, 3-3

LED

, 1-3

Alarm

indicator

Alarm, 3-6 Input A Input B OUTPUT STATUS (1-12) Power

list of equipment

, 1-3, 3-6 , 1-3, 3-6

, 3-6

, 1-3, 3-6

, 2-4

manual, organization, vii mounting into rack

, 1-4

operational verification test, 2-2 organization, manual output channel output channels output ports

, viii

, vii

, 4-5

, viii

OUTPUT STATUS (1-12) indicators, 1-3,

3-6

OUTPut:QUEStionable:PACKed?

command

, 4-6

OUTPut:QUEStionable:PACked? OUTPut:QUEStionable:UNPacked?

, 4-6

, 4-7

outputs

, 1-3

(1-12)

1-12 outputs outputs (1-12) OUTPUTS (1-12) connectors

, 3-3

, 1-3

pace, 3-7, 4-14

, 3-7

pacing parameters parity performance test record performance tests

, 3-7

, 3-7, 4-14

, 2-15

, 2-2

port

A and B, 1-3

ALARM/STATUS

inputs

, viii

OUTPUTS (1-12)

OUTPUTS 1-12

RS-232

, 3-7

, 1-3, 3-4

, 1-3

, 3-3

ports

input A

input B

outputs power

input Power indicator Power jack power module power-up procedure primary input signal

, 3-3 , 3-3

, viii, 3-3

, 1-5

, 5-5

, 1-3, 3-6

, 1-3

, 1-5

, 1-9

, 3-11

quartz, viii

receiver

, 3-6

GPS recommended test equipment record

calibration

performance registers revision code

, 2-20

, 2-15

, ix

, 4-8

ROSCillator:QUEStionable? ROSCillator:WARM? RS-232 configuration RS-232 default values

, 4-10 , 3-9

, 1-7, 1-8, 2-10

RS-232 port

configuring

, 1-7, 1-8

factory default values

, 2-4

, 4-9

User’s Guide Index-3

Index

RS-232 port

factory default values

setting

, 1-7, 1-8

RS-232 serial interface port RS232C interface RS-232C parameters Rubidium

, viii

, 4-13, 4-14

, 3-7

, 1-3

secondary input signal, 3-11 self-test serial interface cables serial interface ports serial number serial port

serial port settings

settings, serial port signal distribution Signal Generator socket

Software pacing specifications

stop bits syntax system health verification SYSTem:COMMunicate:SERial:BAUD 4-13 SYSTem:COMMunicate:SERiaL:BAUD? 4-13 SYSTem:COMMunicate:SERial:BITS? 4-13 SYSTem:COMMunicate:SERial:FDUPlex

SYSTem:COMMunicate:SERial:FDUPlex

SYSTem:COMMunicate:SERial:PACE 4-14 SYSTem:COMMunicate:SERial:PACE? 4-14 SYSTem:COMMunicate:SERial:PARity 4-14 SYSTem:COMMunicate:SERial:PARity? 4-14 SYSTem:ERRor?

, 1-9

, 4-8

configuring

, 1-7, 1-8

factory default values

, 1-3

RS-232

, 1-7, 1-8

setting

, 3-8

changing determining

, 3-8

, 1-11

, 2-4

AC Input, 1-3

, 3-7

electrical, 7-2 supplemental

, 3-7

, 4-3

, 4-13

, 7-2

?, 4-14

, 4-7

, 3-9

, 3-7

, ix

terminal emulation program, 1-5

test

operational verification, 2-2

performance test equipment test record

calibration

performance theory of operation

, 3-6

These twelve outputs

, 2-2 , 2-4

, 2-2

, 2-20

, 2-15

, 5-3

, 3-3

using the HP 58502A, 3-11

verification

operational

, 2-2

terminal

connecting

, 3-9

Index-4 User’s Guide

Symmetricom 58502A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

In This Guide

Guide Organization

Description of the 58502A Broadband Distribution Amplifier

Accessories Supplied and Available

Manuals

Getting Started

58502A Broadband Distribution Amplifier at a Glance

Preparing the Distribution Amplifier for Use

Connecting a Terminal or Computer to the 58502A

Powering Up the Distribution Amplifier

Using Commands to Control Key Functions (Examples)

Performance Tests

Introduction

Test Equipment Required

58502A Operational Verification

58502A Performance Tests

58502A Calibration (Option 010 Only)

Features and Functions

Chapter Contents

Inputs

OUTPUTS

Indicators

Serial Interface Ports

Connecting a Terminal or Computer

Different Ways to Check Alarm Status

Configuring the Inputs

Command Reference

Chapter Contents

SCPI Conformance Information

58502A Command Summary

System Status Reporting Commands

Identification Command

Internal Oscillator Calibrating and Status Commands (Option 010 Only)

Input Port Status and Setup Commands

Serial Interface Communication Commands

Functional Description

Introduction

Functional Block Description of the 58502A

Service

Introduction

Determining 58502A Fault Status

Specifications

Introduction

Index