HP 8562e schematic

Errata

Title & Document Type: 8562E Spectrum Analyzer Service Manual

Manual Part Number: 08562-90216

Revision Date: 1997-12-01

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett­Packard's former test and measurement, semiconductor products and chemical analysis
businesses are now part of Agilent Technologies. We have made no changes to this
manual copy. The HP XXXX referred to in this document is now the Agilent XXXX.
For example, model number HP8648A is now model number Agilent 8648A.

About this Manual

We’ve added this manual to the Agilent website in an effort to help you support your
product. This manual provides the best information we could find. It may be incomplete
or contain dated information, and the scan quality may not be idea l. If we find a better
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product information on the Agilent Test & Measurement website:

www.tm.agilent.com

Search for the model number of this product, and the resulting product page will guide
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Service Guide

HP 8562E Spectrum Analyzer

HEWLETT

Fia

HP Part No. 08582-90218 Supersedes 08582-90209

Printed in USA December 1997

PACKARD

Notice.

The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this material, including

but not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this material.

@

Copyright Hewlett-Packard Company 1996
All Rights Reserved. Reproduction, adaptation, or translation without prior written
permission is prohibited, except as allowed under the copyright laws.
1400 Fountaingrove Parkway, Santa Rosa, CA 95403, USA

Certification

Hewlett-Packard Company certifies that this product met its published specifications at the
time of shipment from the factory. Hewlett-Packard further certifies that its calibration

measurements are traceable to the United States National Institute of Standards and

Technology, to the extent allowed by the Institute’s calibration facility, and to the calibration

facilities of other International Standards Organization members.

Regulatory Information

The HP 8560 E-Series Spectrum Analyzer Calibration Guide contains regulatory information.

Warranty

This Hewlett-Packard instrument product is warranted against defects in material and
workmanship for a period of one year from date of shipment. During the warranty period,
Hewlett-Packard Company will, at its option, either repair or replace products which prove to
be defective.

For warranty service or repair, this product must be returned to a service facility designated
by Hewlett-Packard. Buyer shall prepay shipping charges to Hewlett-Packard and
Hewlett-Packard shall pay shipping charges to return the product to Buyer. However, Buyer
shall pay all shipping charges, duties, and taxes for products returned to Hewlett-Packard

from another country.

Hewlett-Packard warrants that its software and firmware designated by Hewlett-Packard for
use with an instrument will execute its programming instructions when properly installed on
that instrument. Hewlett-Packard does not warrant that the operation of the instrument, or
software, or firmware will be uninterrupted or error-free.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or
misuse, operation outside of the environmental specifications for the product, or improper
site preparation or maintenance.

.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HEWLETT-PACKARD
SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE
REMEDIES. HEWLETT-PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER
BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

. .
III

.

Assistance

Product maintenance agreements and other customer assistance agreements are available for
Hewlett-Packard products. For any assistance, contact your nearest Hewlett-Packard Sales and

Service

Ofice.

Safety Notes

The following safety notes are used throughout this manual. Familiarize yourself with each of
the notes and its meaning before operating this instrument.

Caution

Warning

Instruction

Manual

Caution denotes a hazard. It calls attention to a procedure that, if not

correctly performed or adhered to, could result in damage to or destruction
of the instrument. Do not proceed beyond a caution sign until the indicated
conditions are fully understood and met.

Warning

correctly performed or adhered to, could result in injury or loss of life. Do
not proceed beyond a
understood and met.

The instruction manual symbol. The product is marked with this symbol when it is
necessary for the user to refer to the instructions in the manual.

denotes a hazard. It calls attention to a procedure which, if not

warning

note until the indicated conditions are fully

iv

General Safety Considerations

Warning

Warning

Caution

This is a Safety Class I product (provided with a protective earthing ground
incorporated in the power cord). The mains plug shall only be inserted in a
socket outlet provided with a protective earth contact. Any interruption of the
protective conductor, inside or outside the instrument, is likely to make the
instrument dangerous. Intentional interruption is prohibited.

No operator serviceable parts inside. Refer servicing to qualified personnel. To
prevent electrical shock, do not remove covers.

Before switching on this instrument, make sure that the line voltage selector
switch is set to the voltage of the power supply and the correct fuse is
installed.

V

How to Use This Guide

Chapter 7, “General Troubleshooting,”

can be used to identify the location of a problem to a

board or functional area in the spectrum analyzer.
Chapters 8 through 13, which cover the functional areas, can then be used to help you localize

the problem further.
Once the faulty area is identified, the adjustments and parts information located in chapters 1

through 6 is available to help you fix the problem.

This guide uses the following conventions:

Front-panel

Sof

Screen Text

tkq

Key)

This represents a key physically located on the instrument.
This indicates a “softkey,”

a key whose label is determined by the instrument

firmware.
This indicates text displayed on the spectrum analyzer screen.

Documentation Outline

HP 8560 E-Series Spectrum Analyzer Calibration Guide

n Tells you how to run verification software.
n Tells you the specifications of your spectrum analyzer.
n Tells you how to test your spectrum analyzer.

HP 8560

n Tells you how to make measurements with your spectrum analyzer.
n Tells you how to install the spectrum analyzer.
n Tells you how to program your spectrum analyzer.

HP 8560 E-Series Spectrum Analyzer Quick Reference Guide

n Is an abbreviated version of the HP 8560 E-Series Spectrum Analyzer User’s Guide.
n Provides you with a listing of all remote programming commands.

HP 8560 E-Series Spectrum Analyzer Component Level Information

n Provides schematics and parts lists for the instrument.

E-Series

Spectrum

Analyzer

User’s Guide

vi

Contents

1. General Information

Serial Numbers and Repair Information
Instrument Variations
HP 85629B Test and Adjustment Module
Service Kit
Electrostatic Discharge

Reducing Potential for ESD Damage
Static-Safe Accessories

Returning Instruments for Service

Service Tag
Original Packaging

0 t her Packaging
Recommended Test Equipment
Sales and Service Offices

2. Adjustment Procedures

.Introduction

Safety Considerations

Which Adjustments Should Be Performed?

Test Equipment

Adjustable and Factory-Selected Components

Adjustment Tools

Instrument Service Position
Using the TAM

Test Equipment

Adjustment Indicator
Front End Cal (adjustment)

1. High Voltage Power Supply Adjustment

2. Display Adjustment

3. IF

4. IF Amplitude Adjustments

5. DC Log Amplifier Adjustments

6. Sampling Oscillator Adjustment

7. YTO Adjustment

8. LO Distribution Amplifier Adjustment

9. Frequency Response Adjustment

10. Calibrator Amplitude Adjustment

11. 10 MHz Reference Adjustment-OCXO (Non-Option 103)

12. 10 MHz Reference Adjustment-TCXO (Option 103)

13. Demodulator Adjustment

14. External Mixer Bias Adjustment (Non-Option 327)

15. External Mixer Amplitude Adjustment (Non-Option 327)

..............................

.............................

Bandpass

.................

.........................

................

........................

.................

........................

....................

............................

.........................

..........................

.....................

........................

........................

...............

...........................

..............

..........................

.....................

............................

...........................

........................

......................

...............

.......................

Adjustment

........................

.....................

....................

..................

..................

...............

..................

.................

......

........

.....................

.........

......

l-l
l-2
l-3
l-4
l-4
l-5
l-6
l-6
l-6
l-6
l-7
l-9

1-16

2-l
2-2
2-2
2-2
2-2
2-3
2-3
2-9
2-9

2-9
2-12
2-13

2-15
2-21
2-26
2-30
2-34
2-37
2-40
2-43
2-47
2-48
2-51
2-53
2-56
2-57

Contents-l

16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment

17. 16 MHz PLL Adjustment

18. 600 MHz Reference Adjustment

3.

Frequency Response Adjustment Software

Getting Started

Spectrum Analyzers
Controller (Computer)
Test Equipment
Warmup Time

............................

.........................

........................

...........................

...........................

Test Equipment Warmup
Spectrum Analyzer Warmup

Equipment Connections

Computer (Controller) Setup

.....................

..................

.....................

....................

.......................

....................

HP-IB Cables ..........................

10 MHz Reference .........................

Adjustment Setups ........................

Using Frequency Response Adjustment Software

Loading the Program
Program Operation
Conditions Menu

Test Record Header Information
System Mass Storage File Location

........................

.........................

..........................

..................

.................

Power Sensors ..........................

Setting HP-IB Addresses

......................

Storing and Loading the Conditions File
Getting to the Adjust Menu

....................

Verifying the HP-IB ........................

Querying the Spectrum Analyzer Serial Number
Exiting Frequency Response Adjustment

Dual-Bus Operation ........................

Sensor Utilities Menu

Adding a Power Sensor Data File

........................

..................

Viewing and Editing a Power Sensor Data File
Deleting a File

..........................

Changing the System Mass Storage File Location
Listing Available Power Sensor Data Files
Returning to the Conditions Menu

Adjust Menu

............................

.................

Single Test ............................

Calibrate Power Sensor

......................

List Equipment ..........................

Frequency Response Adjustment Menu Softkeys

Conditions Menu
Sensor Utilities Menu
Adjust Menu

..........................

........................

............................

Front End Cal (YIG-Tuned Filter/Mixer (RYTHM) and Frequency

Response Adjustment)

.....................

Frequency Response Adjustment Error Messages

Error Messages Beginning with Alphabetic Characters

Address must be from 0 to 30 inclusive

...........

.............

...............

...........

...............

............

...........

..............

.............

.............

..........

...............

2-60
2-63
2-66

3-2
3-2
3-2
3-3
3-3
3-3
3-3
3-4
3-4
3-4
3-4
3-4
3-5
3-5
3-5
3-6
3-6
3-6
3-6
3-7
3-7
3-8
3-8
3-8
3-8
3-8

3-9

3-9
3-10
3-10
3-10
3-10
3-10
3-10
3-11
3-11
3-11
3-12
3-12
3-12
3-13

3-14
3-16
3-16
3-16

Contents-2

Cal Factor outside of 0 to 150% range entered

............

CONDITIONS file from system file location is not compatible! WARNING

Conditions Menu DUT ID disagrees with responding DUT ID .....

Data not accepted, check entry format ................

DUT doesn’t respond at address listed ................

File <filename> not found .....................

Insufficient equip. to do test <test number> : <test name> ......

No HP-IB address listed for DUT ..................

Non-numeric entry other than S entered, or frequency

<=O

......

No sensor file found for <sensor model> S/N <sensor serial #> ....

Power meter reads <value>
Select code

<value>

does not currently support HP-IB operations

dBm

..................

...

Sensor serial number must be from 1 to 99999 ............

System mass storage file location catalog cannot be read ........

This program does not support the current DUT ...........

Unable to load CONDITIONS file from listed system file location

....

Unable to load data from <sensor filename> .............

Unable to obtain catalog from <system mass storage file location>
Unable to reach power level of <value>

dBm

.............

...

WARNING: CONDITIONS file from system file location is not compatible!

Error Messages Beginning with Numeric Characters ...........

8481A Sensor cal data minimum frequency not <= 50 MHz ......

8481A Sensor cal data maximum frequency not >= 300 MHz ......

8485A Sensor cal data minimum frequency not = 10 MHz .......

8485A Sensor cal data maximum frequency not >= 26.5 GHz .....

Error Messages Beginning with Variables ...............

<filename> file not found .....................

<keyboard entry> is a non-numeric entry ..............

<number of instruments> instruments have HP-IB addresses of <HP-IB

address> ...........................

<power meter model number> doesn’t read signal to be in -1 +/-5

range
<source model number> signal not in +5 +/-5
<source model number> signal not in -1 +/-5
<source model number>

.............................

dBm

range ......

dBm

range ......

+lO dBm

signal not in

+lO

+/-8

dBm

range

dBm

.

<source model number> has a cold oven ...............

<source model number> is unlevelled ................

3-16
3-16
3-16
3-16
3-16
3-17
3-17

3-17
3-17
3-17
3-17
3-17
3-17

3-17
3-17
3-18
3-18
3-18
3-18
3-18
3-18
3-18
3-18
3-18
3-18
3-19
3-19
3-19

3-19

3-19
3-19
3-19
3-19
3-19
3-19

4. Assembly Replacement

Access to Internal Assemblies ......................

Cable Color Code ...........................

Procedure 1. Spectrum Analyzer Cover ................

Procedure 2. Al Front Frame/Al8 CRT ...............

Procedure 3.
Procedure 4.
Procedure 5. A2, A3, A4, and A5 Assemblies
Procedure 6. A6 Power Supply Assembly
Procedure 7.

AlAl

Keyboard/Front Panel Keys ............

AlA

RPG

......................

.............

...............

A6Al

High Voltage Assembly ..............

Procedure 8. A7 through Al3 Assemblies ...............

A7 First LO Distribution Amplifier
A8 Low Band Mixer

.........................

..................

4-2
4-3
4-4

4-5
4-13
4-14
4-15
4-21
4-25
4-28
4-30
4-31

Contents-3

A9 Input Attenuator
A10 YIG-Tuned Filter/Mixer (RYTHM)

AllYTO

.............................

Al3 Second Converter
Procedure 9. Al4 and Al5 Assemblies

........................

................

........................

................

Procedure 10. Al6 Fast ADC and Al7 CRT Driver ...........

Procedure 11. Bl Fan
Procedure 12.

BTl

Procedure 13. Rear Frame/Rear Dress Panel
Procedure 14. W3 Line Switch Cable
Procedure 15. EEROM (A2U500)
Procedure 16. A21 OCXO

.......................

Battery

.....................

.............

.................

..................

......................

5. Replaceable Parts

Ordering Information .........................

Direct Mail-Order System ......................

Direct Phone-Order System .....................

Parts List Format ...........................

Firmware-Dependent Part Numbers ...................

6. Major Assembly and Cable Locations

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-32
4-34
4-35
4-36
4-37
4-40
4-42
4-43
4-44
4-48
4-55
4-56

5-l
5-l
5-2
5-2
5-2

6-l

7. General Troubleshooting

Introduction

Assembly Level Text

.............................

........................

Block Diagrams ........................... 7-l

Assembly Test Points

........................

Pad ...............................

Test Jack ............................

Ribbon Cables

...........................

Service Cal Data Softkey Menus

Troubleshooting to a Functional Section

TAM (Test and Adjustment Module)

Loading and Running the HP

Loading the software .......................

HP-IB addresses .........................

Data

files

and system mass storage files ...............

Executing a test .........................

TAM Requirements
Test Connectors

.........................

..........................

Revision Connectors ........................

Inconsistent Results
Erroneous Results
Blank Display

.........................

..........................

...........................

Automatic Fault Isolation

Display/Power Supply .......................

Controller Check .........................

ADC/Interface Check .......................

IF/LOG Check ..........................

LO Control Check ........................

...................

.................

..................

8562E/TAM

Interface Software (TAM I/F SW)

......................

7-l
7-l

7-2
7-2
7-2
7-2
7-6
7-8

7-10
7-10

7-10
7-11
7-11
7-11
7-12
7-13
7-13
7-13
7-13
7-13
7-14
7-14
7-14
7-14
7-14
7-15

Contents-4

RF Low Band Check .......................

Manual Probe Troubleshooting ....................

RF Path Fault Isolation .......................

Calibration Oscillator Troubleshooting Mode ..............

Error Messages ............................

Viewing Multiple Messages ......................

Error Message Elimination ......................

System Analyzer Programming Errors (100 to 150) ............

ADC Errors (200 to 299) .......................

LO and RF Hardware/Firmware Failures (300 to 399) ..........

YTO Loop Errors (300 to 301) ...................

Roller PLL Errors (302 to 316) ...................

YTO Loop Errors (317 to 320) ...................

Roller Oscillator Errors (321 to 329) .................

YTO Loop Error (331) ......................

600 MHz Reference Loop (333) ...................

YTO Leveling Loop (334) .....................

Sampling Oscillator (335) .....................

10 MHz Reference (336) ......................

Fractional N PLL (337) ......................

YTO Loop Settling Errors (351 to 354) ...............

Sampling Oscillator (355) .....................

Span Accuracy Calibration Errors (356 to 361) ............

Automatic IF Errors (400 to 599) ...................

System Errors (600 to 651) ......................

Digital and Checksum Errors (700 to 799) ...............

EEROM Checksum Errors (700 to 704) ...............

Program ROM Checksum Errors (705 to 710) ............

RAM Check Errors (711 to 716) ..................

Microprocessor Error (717) .....................

Battery Problem (718) ........................

Model Number Error (719) ......................

System Errors (750 to 759) ......................

Fast ADC Error (760) ........................

Option Module Errors (800 to 899) ..................

User-Generated Errors (900 to 999) ..................

Block Diagram Description .......................

RF Section .............................

A7 SLODA ...........................

A8 Low Band Mixer ........................

A9 Input Attenuator .......................

A10 YIG-Tuned Filter/Mixer ....................

All YTO ............................

Al3 Second Converter .......................

Second IF Amplifier (part of A15) ..................

Third Converter (part of A15) ...................

Flatness Compensation Amplifiers (part of A15)

Synthesizer Section .........................

Sweeping the First LO .......................

Reference PLL (part of A15) ....................

YTO PLL (A7, All, part of A14, part of A15) ............

...........

7-15

7-15
7-16
7-16
7-17
7-17
7-18
7-18
7-19
7-20
7-20
7-20
7-23

7-24
7-25
7-26
7-26
7-26
7-26
7-26
7-27
7-27
7-27
7-28
7-37
7-37
7-37
7-38
7-39
7-39
7-39
7-39

7-40
7-40
7-40
7-41
7-42
7-43
7-43
7-43
7-44
7-44
7-44
7-44
7-44
7-45
7-45
7-46
7-46
7-46
7-46

Contents-5

Offset Lock Loop (part of A15)

...................

Fractional N PLL (part of A14)

IF Section .............................

A4 Log Amplifier/Cal Oscillator Assembly

A5 IF Assembly .........................

ADC/Interface Section

.......................

ADC ..............................

Main ADC (part of A3 interface assembly)
Fast ADC

...........................

Log Expand/Video Functions ....................

Triggering

Controller Section

EEROM
Firmware
Display ASM

Display/Power Supply Section

............................

..........................

.............................

............................

...........................

....................

A6 Power Supply .........................

Al7 CRT Display Driver ......................

8. ADC/Interface Section

Troubleshooting Using the TAM

Automatic Fault Isolation

Keyboard/RPG Problems

Keyboard Interface
RPG Interface

...........................

.......................

.........................

....................

......................

Triggering or Video Gating Problems
Preselector Peaking Control (Real Time DAC)
Flatness Control (RF Gain DACs)
A3 Assembly Video Circuits

Log Offset/Log Expand
Video MUX
Video Filter

............................

............................

......................

.......................

Video Filter Buffer Amplifier
Positive/Negative Peak Detectors
Peak Detector Reset
Rosenfell Detector
ADC MUX.

............................

.........................

.........................

Variable Gain Amplifier (VGA)
Track and Hold

A3 Assembly ADC Circuits

ADC Control Signals
ADC Start/Stop Control
ADCASM
ADC

...............................

Ramp Counter

...........................

......................

........................

.......................

.............................

...........................

A3 Assembly Control Circuits

Analog Bus Drivers
Analog Bus Timing
Interface Strobe Select

.........................

.........................

........................

...................

.....................

...................

....................

.....................

Al6 Assembly Fast ADC Circuits (Option 007)

Video Input Scaling Amplifiers and Limiter

...................

..............

.............

..................

..............

..............

..............

7-47

7-47

7-48
7-48
7-49
7-49
7-49
7-49
7-49
7-49
7-50
7-50
7-50
7-50
7-51
7-51
7-51
7-51

8-4
8-4
8-7
8-7
8-8

8-9
8-12
8-13
8-14
8-15

8-16
8-17

8-18
8-19

S-20

8-21
8-21

8-23

8-23
8-24
8-24
8-25
8-26
8-26
8-27
8-28
8-28
8-29

S-30

8-31
8-31

Contents-6

B-Bit Flash ADC
Peak/Pit Detection

32 K-Byte Static RAM

..........................

.........................

.......................

Al6 Assembly Fast ADC Control Circuits (Option

CPU Interface and Control Registers
Reference Clock
Clock and Sample Rate Generator
Trigger

..............................

16-Bit Post-Trigger Counter

15-Bit (32 K)

Video Trigger Comparator

9. IF Section

Troubleshooting Using the TAM

..........................

..................

.....................

C

ircular

Address Counter

......................

....................

Troubleshooting the Log Amplifier with the TAM
Troubleshooting A5 with the TAM

..................

Troubleshooting the Cal Oscillator with the TAM

Automatic IF Adjustment

Parameters Adjusted
Requirements

............................

Performance Test Failures

.......................

........................

.......................

IF Gain Uncertainty Performance Test
Scale Fidelity Performance Test

....................

Resolution Bandwidths Performance Tests

Log Amplifier (P/O A4 Assembly)

Log Amplifier

Linear Amplifiers
Video Offset
Video Output

...........................

..........................

............................

...........................

...................

Frequency Counter Prescaler/Conditioner
AM/FM Demodulator

4.8 kHz IF Filters

10.7 MHz IF Filters

4.8 kHz and 10.7 MHz IF Filters

10.6952 MHz

Input Switch

LO Switch

VCXO

............................

.............................

Synchronous Detector

Limiter

.............................

Isolation Amplifier

Detector/Mixer

Log Offset/Gain Compensation

Log Offset Compensation
Log Gain Compensation

Video MUX

A5 IF Assembly

IF Signature

............................

...........................

............................

Common IF Signature Problems

........................

..........................

.........................

...................

.........................

........................

........................

..........................

....................

.....................

......................

...................

1 MHz Resolution Bandwidth Problems

30 kHz Resolution Bandwidth Problems

3 kHz and 10 kHz Resolution Bandwidth Problems

007)

..........

.................

................

............

............

.................

...............

...............

................

................

...........

8-32
8-33
8-33
8-34
8-34
8-36
8-37
8-37
8-38
8-38
8-39

9-3
9-4
9-4
9-8
9-9

9-10

9-11
9-12
9-12
9-12
9-13
9-13
9-13

9-14
9-15
9-16
9-16
9-16
9-17
9-17

9-18

9-18

9-19

9-19

9-19

9-20

9-20

9-20

9-20

9-20

9-20

9-21

9-21

9-22
9-26
9-29
9-30
9-30

Contents-7

Step Gains

Cal Oscillator (P/O A4 Assembly)

Cal Oscillator Unlock at Beginning of IF Adjust

Inadequate CAL OSC AMPTD Range

300 Hz to 3 kHz Resolution Bandwidth Out of Specification
Low-Pass Filter

.............................

...................

............

.................

.......

...........................

Sweep Generator ..........................

AM/FM Demodulation, Audio Amplifier, and Speaker

10. Controller Section

Troubleshooting Using the TAM

....................

..........

Blank Display ...........................

Digital Signature Analysis (DSA)

....................

Display Problems ...........................

Line Generators

..........................

Blanking ..............................

Display Jumbled or Trace Off Screen

.................

Intensity ..............................

Bad Characters or Graticule
Long Lines Dimmer Than Short Lines

Analog Zero-Span Problems (Non-Option 007)

Frequency-Count Marker Problems
Frequency Counter

..........................

State- and Trace-Storage Problems

Keyboard Problems

..........................

.....................

.................

..............

...................

...................

9-31
9-32
9-33
9-33
9-34
9-38

9-38

9-38

10-2
10-2
10-4
10-4
10-4
10-5

10-7
10-10
10-10
10-11
10-12
10-13
10-14
10-15

lo-16

11. Synthesizer Section

Troubleshooting Using the TAM
Troubleshooting Test Setup

....................

......................

Confirming a Faulty Synthesizer Section
General PLL Troubleshooting

PLL Locked at Wrong Frequency
Unlocked PLL

Unlocked Reference PLL

Operation
Troubleshooting

...........................

........................

.............................

..........................

Third LO Driver Amplifier

.....................

...................

.......................

Unlocked Offset Lock Loop (Sampling Oscillator)

Operation
Troubleshooting

.............................

..........................

Check path to phase/frequency detector (steps 14-19)

Unlocked YTO PLL

Operation

.............................

..........................

Troubleshooting an Unlocked YTO PLL

Unlocked Fractional N PLL

Operation

.............................

......................

Confirming an Unlocked Condition
Fractional N PLL

Frequency Span Accuracy Problems

Determining the First LO Span
Confirming Span Problems

..........................

...................

....................

......................

.................

.............

.........

................

..................

11-2
11-8

11-8
11-13
11-13
11-15
11-16
11-16
11-16
11-19
11-20
11-20
11-20
11-22
11-23
11-23
11-25
11-31
11-31
11-31
11-32
11-36
11-36
1 l-37

Contents-6

YTO Main Coil Span Problems (LO Spans
YTO FM Coil Span Problems (LO Spans 2.01 MHz to 20 MHz)

Fractional N Span Problems (LO Spans 12 MHz) ............

First LO Span Problems (All Spans) .................

First LO Span Problems (Multiband Sweeps)

Phase Noise Problems

Phase Noise in Locked versus Unlocked Spans
Reference versus Reference PLL Phase Noise

Fractional N versus Offset PLL or YTO PLL Phase Noise ........

Fractional N PLL Phase Noise
Sampler and Sampler IF
Sweep Generator Circuit
A21 OCXO

12. RF Section

.............................

Troubleshooting Using the TAM
Low Band Problems

..........................

High Band Problems
Low and High Band Problems
A7 LO Distribution Amplifier
A8 Low Band Mixer

..........................

A9 Input Attenuator
Al3 Second Converter
Al4 Frequency Control Assembly

LODA Drive

.............................

Control Latch for Band-Switch Driver .................

YTF Driver Circuit

Al5 RF Assembly

...........................

Confirming a Faulty Third Converter .................

Confirming Third Converter Output
Third Converter

..........................

Flatness Compensation Control
Control Latches

...........................

SIG ID Oscillator (Option 008)
10 MHz Reference

..........................

>20

MHz)

..........

.....

..............

.........................

.............

..............

....................

........................

........................

....................

.........................

.....................

.....................

.........................

.........................

....................

.........................

..................

....................

....................

11-38
11-38
1 l-39

11-40
11-41
11-43
1 l-43
11-43
1 l-44
11-44
1 l-45
11-46
11-50

12-2
12-4
12-5
12-5
12-6
12-7
12-8
12-9

12-11

12-11
12-12
12-13
12-16
12-16
12-16
12-17
12-18
12-18
12-19
12-20

13. Display/Power Supply Section

Troubleshooting Using the TAM

Blank Display (Using the TAM)
Blank Display
Blanking Signal
Display Distortion
Focus Problems
Intensity Problems

............................

............................

..........................

............................

..........................

....................

...................

A6 Power Supply Assembly Troubleshooting ...............

Dead Power Supply

Check the Supply Voltages

Kick-start/Bias
Buck Regulator
Line Fuse Blowing
Supply Restarting Every 1.5 Seconds (Kick Start)

.........................

......................

...........................

...........................

.........................

............

13-4
13-5
13-6
13-7
13-8
13-9

13-10

13-12
13-12
13-12
13-13
13-13
13-14
13-14

Contents-9

Low Voltage Supplies
Buck Regulator Control Loop
High Voltage Supplies
CRT Supply Dropping Out
Buck Regulator Control
DC-DC Converter Control

Power Up

A. Component-Level Information Packets

Index

.............................

........................

....................

........................

......................

.......................

......................

13-15
13-15
13-15
13-16
13-17
13-17
13-18

Contents-10

Figures

l-l. Example of a Static-Safe Workstation

l-2. Spectrum Analyzer Shipping Container and Cushioning Materials
2-l. High Voltage Power Supply Adjustment Setup
2-2. Display Adjustment Setup
2-3. CRT Adjust Pattern
2-4. A2 Display Adjustment Locations
2-5. IF
2-6. TAM Connector Pin Locations
2-7. IF Amplitude Adjustment Setup
2-8. IF Amplitude Adjustment Locations
2-9. DC Log Adjustment Setup

2-10. DC Log Adjustment Locations

2-

11. Sampler Adjustment Setup
2-12. TAM Connector Pin Locations
2-13. YTO Adjustment Setup
2-14. YTO Adjustment Locations
2-15. First LO Distribution Amplifier Adjustment Setup
2-16. TAM Connector Pin Locations
2-17. Frequency Response Adjustment Setup
2-18. Calibrator Amplitude Adjustment Setup
2-19. 10 MHz Reference Adjustment Setup and Adjustment Location
2-20. 10 MHz Reference Adjustment Setup-TCXO
2-21. Demodulator Adjustment Setup
2-22. Demodulator Adjustment Locations
2-23. External Mixer Bias Adjustment Setup
2-24. External Mixer Amplitude Adjustment Setup
2-25. RYTHM Adjustment Setup
2-26. 16 MHz PLL Adjustment Setup
2-27. 16 MHz PLL Adjustment Location

3-l. Front End Cal Adjustment Setup

4-

1. Hinged Assemblies
4-2. Discharging High Voltage on the CRT
4-3. A9, A18, and Line-Switch Assembly Mounting Screws
4-4. front frame Mounting Screws
4-5. Installing the CRT and front frame Assemblies
4-6. Placing the CRT into the Front Frame
4-7. A2, A3, A4, and A5 Assembly Removal
4-8. Assembly Cables (1 of 2)
4-9. Coaxial Cable Clip

4-10. HP-IB and
4-l 1. A6 Power Supply Connections
4-12. Power Supply Cover

Bandpass

Adjustment Setup

.........................

.........................

AlAl Wl

Cable Placement

.........................

......................

........................

....................

....................

......................

....................

......................

....................

.......................

.....................

....................

.....................

.....................

.......................

....................

.................

.............

...................

...................

.................

...........

................

................

.............

...................

..................

................

..............

...................

..................

...................

.................

..........

.............

.................

................

................

.....

......

l-5

l-8
2-13
2-15
2-17
2-19
2-21
2-22
2-26
2-27
2-30
2-31
2-34
2-35
2-37
2-39
2-40
2-41

2-44
2-47
2-49

2-51

2-53
2-55
2-56
2-57
2-60
2-63
2-64
3-15

4-4

4-7

4-8

4-9

4-10
4-11
4-16
4-17
4-19
4-20
4-23
4-24

Contents-l 1

4-13.

Al6 Fast ADC and Al7 CRT Driver Mounting Screws

4-14.

HP 85623 Assembly Locations

4-15.

A9 Mounting Screw at Right Side Frame

4-16.

A10 Mounting Screws

4-17.

HP 85623 All Mounting Screws at Right Side Frame

4-18.

Al4 and Al5 Assembly Removal

4-19.

Al4 and Al5 Assembly Cables

4-20.

Al6 and Al7 Mounting Screws

4-21.

Al6 Cable Routing

4-22.

Main Deck Screws

4-23.

A6 Power Supply Cover

4-24.

W3 Dress and Connection to A6 Power Supply

4-25.

Line-Switch Mounting Screw and Cable Dress

4-26

1.

W3 Cable Connector

4-27

Side Frame Mounting Screws

4-28

A21 OCXO Mounting Screws

5-l

Parts Identification, Assembly Mounting

5-2

Parts Identification, Cover Assembly

5-3

Parts Identification, Main Chassis

5-4

Parts Identification, RF Section

5-5

Parts Identification, Front Frame

5-6

Parts Identification, Rear Frame

6-l

Hinged Assemblies

/

6-2

Top View (A2 Unfolded)

6-3

Top View (A2 and A3 Unfolded)

6-4

Top View (A2, A3, A4, and A5 Unfolded)

6-5.

Bottom View (Al5 Unfolded)
Bottom View (Al5 and Al4 Unfolded)

6-6.
6-7.

Al6 Fast ADC (Option 007)

6-8.

HP 85623 Front End
Rear View

6-9.

7-l.

Assembly Test Points

7-2.

Ribbon Cable Connections (1 of 2)

7-3.

Service Cal Data Menu

7-4.

Functional Sections

7-5.

Phase Lock Loops
Simplified Block Diagram

7-6.
7-7.

Overall Block Diagram (1 of 3)

8-l.

A3 Test Connectors

8-2.

A3 Interface Assembly Block Diagram
Fast ADC (Option 007) Block Diagram

8-3.

9-l.

A4 and A5 Test Connectors

9-2.

IF Section Troubleshooting with the TAM
IF Adjust Signature

9-3.
9-4.

Detailed IF Adjust Signature (1)
Detailed IF Adjust Signature (2)

9-5.

Detailed IF Adjust Signature (3)

9-6.
9-7.

Detailed IF Adjust Signature (4)
Detailed IF Adjust Signature (5)

9-8.

Noisy Signature

9-9.

Noise with Correct Shape

9-10.

.............................

...........................

........................

.........................

.........................

.......................

........................

.........................

.......................

........................

........................

.......................

.........................

..........................

.........................

.........................

....................

...................

....................

....................

.....................

.....................

.................

...................

....................

...................

...................

...................

.....................

.....................

..................

......................

....................

.................

.....................

...................

...................

...................

...................

...................

......................

..........

................

..........

.............

.............

................

...............

................

................

...............

4-26

4-29

4-33
4-34
4-35

4-37

4-39

4-40

4-41

4-45

4-47

4-49

4-51
4-52
4-54

4-56

5-15
5-23
5-25
5-27

5-29

5-31

6-4
6-4
6-5
6-6
6-7
6-8

6-9

6-10
6-11

7-3

7-4

7-7

7-42

7-47
7-53
7-55

8-4

8-41

8-43

9-3

9-7
9-23
9-24

9-24

9-25
9-25
9-26
9-27
9-27

Contents-12

9-11. Region B Amplitude Variation ....................

9-12. Region B Amplitude Offset ......................

9-13. Faulty Crystal Short ........................

9-14. Faulty LC Pole ...........................

9-15. Faulty Crystal Symmetry ......................

9-16. Output Waveform, 10 kHz Resolution Bandwidth ............

9-17. Output Waveform, 3 kHz Resolution Bandwidth ............

9-18. Output Waveform, 1 kHz Resolution Bandwidth ............

9-19. Output Waveform, 300 Hz Resolution Bandwidth ............

9-20.

Failed Crystal Set Symptoms .....................

9-21. A4 Log Amplifier/Cal Oscillator Block Diagram ............

9-22. A5 IF Assembly Block Diagram ....................

10-l. A2 Test Connectors .........................

10-2. Line Generator Output Waveforms ..................

10-3. Blanking Waveforms ........................

10-4. Expanded Blanking Waveforms ....................

10-5. Switch Driver Waveform LCHAR ...................

10-6. Distorted X/Y Line Generator Waveforms ...............

10-7. Expanded X/Y Line Generator Waveforms ...............

10-S. Normal X/Y Line Generator Waveforms ................

10-9.

Delta X Waveform .........................

10-10. Delta Y Waveform .........................

10-11.
10-12. A2 Controller Block Diagram

11-l. Al4 and Al5 Test Connectors
11-2. TAM Connector Pin Locations
11-3. YTO Loop Test Setup

11-4. Sampler and Sampling Oscillator Test Setup ..............

11-5. PLL Locked at Wrong Frequency

11-6. Unlocked PLL

11-7. Troubleshooting an Unlocked YTO PLL ................

11-8. VCO Bias Voltages

11-9. HP 85623 Sweep and Scan Ramps ..................

11-10. Simplified Synthesizer Section ....................

1 l-11. Simplified Al4 Assembly Block Diagram
11-12. Simplified Al5 Assembly Block Diagram
11-13. Frequency Control Block Diagram

11-14. RF Assembly Block Diagram .....................

12-1. Al4 and Al5 Test Connectors

12-2. A14J10, Solder Side of Al4 (Ig

12-3. A7 First LO Distribution Amplifier Drive
12-4. HP 85623 Rear-Panel LO SWP Output
12-5. HP 85623 Signal at A14J15 Pin 1

12-6. 10 MHz Reference at A15J302 ....................

12-7. 10 MHz TTL Reference at

12-8. Figure 12-8. RF Section, Troubleshooting Block Diagram ........

13-1. Simplified Section Block Diagram ...................

13-2. Al7 Test Connector .........................

13-3. Probe Power Socket .........................

13-4. A6 Power Supply Block Diagram ...................

13-5. Al7 CRT Driver Block Diagram

DEFl

Synchronization ........................

.....................

....................

....................

........................

...................

...........................

.........................

................

................

...................

....................

nore Pin Numbers on Mating Connector) . .

...............

................

...................

U304

Pin 13

...................

................

9-28
9-28
9-29
9-30
9-31
9-35
9-36
9-36
9-37

9-37
9-41
9-45

10-3

10-5

10-6

10-7

10-S

10-9

10-9

10-10
10-11
10-12
10-13
10-17

11-3

11-3

11-11
11-12
11-14
11-15
11-25
11-34
1 l-42
1 l-47
1 l-48
1 l-49
11-51
11-53

12-2
12-6

12-12
12-14
12-14
12-21
12-22
12-25

13-2
13-5
13-7

13-19
13-21

Contents-13

A-l. HP 85623 Interconnect Block Diagram . . . . . . . . . . . . . . . .

A-5

Contents-14

Tables

l-l. Instrument Variations
l-2. Service Kit Contents
l-3. Static-Safe Accessories

l-4. Recommended Test Equipment
l-5. Hewlett-Packard Sales and Service Offices
2-l. Related Adjustments
2-2. Adjustable Components
2-3. Factory Selected Components
2-4. TAM Adjustments
2-5. Required Test Equipment for TAM
2-6. Factory-Selected LC Filter Capacitors
2-7. LC Factory-Selected Capacitor Selection
2-8. Factory-Selected XTAL Filter Capacitors
2-9. XTAL Factory-Selected Capacitor Selection

2-10. Capacitor Part Numbers
2-11. Sampling Adjustments
2-12. Conversion Loss Data

3-1. Required Test Equipment Summary
4-l. Required Tools
5-l. Reference Designations, Abbreviations and Multipliers
5-2. Manufacturers Code List
5-3. Replaceable Parts

7-l. Location of Assembly Troubleshooting Text
8-l. W2 Control Cable Connections

8-2. Automatic Fault Isolation References
8-3. TAM Tests versus A3 Test Connectors
8-4. Keyboard Matrix
8-5. Counter Frequencies

8-6. Trigger MUX Truth Table
8-7. A3U102 Latch Outputs
8-8.

HMUXSELO/l

8-9. Logic Levels at A3U108

S-10. Demultiplexer A3U410 Truth Table
8-11. Demultiplexer A3U500 Truth Table
8-12.

LP/Q

Truth Table

8-13. Control Word at Primary Address (U3 and U4)

9-l. Automatic Fault Isolation References

9-2. TAM Tests versus Test Connectors

9-3. Sweep Width Settings

10-l. TAM Tests versus Test Connectors
10-2. Gate Times
11-l. Measured Signal Line Location
11-2. Automatic Fault Isolation References

...........................

versus Detector Mode

............................

........................

........................

........................

....................

...............

........................

.......................

.....................

.........................

..................

.................

................

...............

..............

.......................

........................

........................

..................

.......................

..........................

..............

....................

.................

.................

..........................

.........................

......................

.......................

................

.......................

..................

..................

.........................

.............

.................

..................

........................

..................

....................

.................

..........

l-2
l-4
l-6

l-10
1-17

2-4
2-6
2-8

2-10
2-11
2-23
2-23
2-24
2-24
2-25
2-36
2-59

3-3
4-3
5-3
5-6
5-7

7-9
8-2
8-5

8-6

8-7

8-9

8-9

8-18

S-20

8-22

S-30
S-30

8-33
8-34

9-4

9-5

9-9

10-2

10-14

11-3
11-4

Contents-15

11-3. TAM Tests versus Test Connectors
11-4. Center Frequency Tuning Values
11-5. Sampling Oscillator Test Frequencies
11-6. Sampling Oscillator PLL Divide Numbers
11-7. Amplifier Polarities

11.8. Voltages in FM Coil and Main Loop Drivers
11-9. Main Coil Coarse and Fine DACs Voltages

11-10. Postscaler Divide Numbers
11-11. Unlocked Fractional N Troubleshooting Areas
11-12. Divider and Integrator Troubleshooting
11-13. Sweep Signal Destination versus Span

11-14. Harmonic Mixing Number versus Center Frequency ...........

11-15. Settings of Sweep Switches
11-16. Settings for Switches and Comparators

12-1. Automatic Fault Isolation References
12-2. TAM Tests versus Test Connectors
12-3. HP 85623 Attenuator Control Truth Table
12-4. Sweep + Tune Multiplier Values
12-5. RF Section Mnemonic Table
13-1. Wl Power-Cable Connections
13-2. Automatic Fault Isolation References
13-3. TAM Tests versus Test Connectors

A-l. HP 8562 Spectrum Analyzer Documented Assemblies ..........

.........................

......................

......................

.....................

..................

...................

.................

...............

..............

...............

.............

................

.................

................

.................

..................

...............

...................

....................

.................

..................

11-6

11-9
11-13
11-21
11-24
11-29
11-29
11-32
11-33
11-35
11-36
11-36
11-38
11-41

12-3
12-4

12-9
12-15
12-23

13-3

13-4

13-5

A-2

Contents-l 6

General Information

This HP

service the HP 85623 to the assembly level.

8562E

Spectrum Analyzer Service Guide contains information required to adjust and

Serial Numbers and Repair Information

Hewlett-Packard makes frequent improvements to its products to enhance performance,
usability, or reliability. Hewlett-Packard service personnel have access to complete records of
design changes to each type of equipment, based on the equipment serial number. Whenever
you contact Hewlett-Packard about a product, have the complete serial number available to

ensure obtaining the most complete and accurate information possible.

The serial number label is usually attached to the rear of the product. The serial number has
two parts: the prefix (two letters and the first four numbers), and the suffix (the last four

numbers).

Serial Number Label Example

The two letters identify the country in which the unit was manufactured. The four numbers of
the prefix are a code identifying the date of the last major design change incorporated in your
Hewlett-Packard product. The four-digit suffix is a sequential number and, coupled with the
prefix, provides a unique identification for each unit produced. Whenever you list the serial
number or refer to it in obtaining information about your Hewlett-Packard product, be sure to
use the complete number, including the full prefix and the suffix.

Units which were produced before the serial number format was changed may also be covered
by this documentation. On earlier serial number labels, the prefix consists of the first four

numbers and a single letter. The suffix is a five-digit sequential number.

General Information

l-1

c!a

3425A00564

HEWLETT
PACKARD

I

Earlier Serial Number Label Example

The new serial number format (USOOOOOOOO) is always considered “above” the earlier format

(OOOOAOOOOO) h y

above” or “. . . .

w en ou encounter change information such as “. . . . serial prefix 3425A and

serial number

3425A00564

and above.”

Instrument Variations

There are options available to the HP 85623. The following table lists these options and

identifies the assemblies which are unique to them.

Table l- 1. Instrument Variations

Sweep Output)

HP 85623 Option 007

(Fast ADC)

HP 85623 Option 008

(SIG

ID)

HP 85623 Option 103

(Delete OCXO)

HP 85623 Option 104

and

Video Output)

Added

W19 Cable Assembly

Rear-Panel J 10
W58 Cable Assembly

Al6 Fast ADC Assembly

A3 Interface Assembly

(Opt 007)

W20 Cable Assembly

(Opt 007)
W59 Cable Assembly
Al5 RF Assembly (Opt 008)

Al5 RF Assembly (Opt 103)

Deleted

A3 Interface Assembly

Wd)

W20 Cable Assembly

(St4

Al5 RF Assembly (Std)

Al5 RF Assembly (Std)
W49 Cable Assembly

W50 Cable Assembly

A21 OCXO
HP 85620A Mass

Memory Module
W24 Cable Assembly
W36 Cable Assembly
Front-panel
Rear-panel

53

54

l-2 General Information

HP 85629B Test and Adjustment Module

When attached to the rear panel of the spectrum
adjustment module (TAM) provides diagnostic functions for the HP 85623. The TAM is
accessed by a computer running interface software; this software is supplied with Option 915,
add Service Documentation. The TAM measures voltages at key points in the circuitry and

flags a failure whenever the voltage falls outside the limits. The TAM locates the failure

to a small functional area, which can then be examined manually. See chapter 7, “General
Troubleshooting,”
software.

for a complete description of how to use the TAM and its interface

amdyzer,

the HP 85629B test and

General Information

l-3

Service Kit

The spectrum analyzer service kit (HP part number 08562-60021) contains service tools

required to repair the instrument. Refer to Table l-2 for a list of items in the service kit.

Table l-2. Service Kit Contents

Description

Cable Puller
PC Board Prop
Line Filter Assembly

Line Switch Cable

Extender Cable
BNC to SMB (snap-on) Cable

Connector Extractor Tool Kit

Quantity

I

1
1
1
1
1

2

I

HP Part Number

5021-6773
5021-7459
5061-9032
5062-0728
5062-0737

85680-60093

8710-1791

Electrostatic Discharge

Electrostatic discharge (ESD)
all work performed on assemblies consisting of electronic components should be done at a
static-free workstation. Figure l-l is an example of a static-safe workstation using two kinds
of ESD protection:

w

Conductive table mat and wrist-strap combination

n Conductive floor mat and heel-strap combination

These methods may be used together or separately.

can damage or destroy electronic components. Therefore,

l-4 General Information

ist

Stra61

Building

Ground

w--A-

Cord

’

I-

L

II

Figure l-l. Example of a Static-Safe Workstation

Reducing Potential for ESD Damage

The suggestions that follow may help reduce ESD damage that occurs during instrument
testing and servicing.

n Before connecting any coaxial cable to an spectrum analyzer connector for the first time

each day, momentarily ground the center and outer connectors of the cable.

H

Personnel should be grounded with a resistor-isolated wrist strap before touching the center

pin of any connector and before removing any assembly from the unit.

n Be sure all instruments are properly earth-grounded to prevent build-up of static discharge.

General Information

l-5

Static-Safe Accessories

Set includes: 3M static control mat 0.6 m x 1.2 m (2 ft x 4 ft) and 4.6 cm (15 ft)
ground wire. (The wrist-strap and wrist-strap cord are not included. They must
be ordered separately.)

Table 1-3. Static-Safe Accessories

Description

Wrist-strap cord, 1.5 m (5 ft).
Wrist-strap, color black, stainless steel, without cord, four adjustable links and

7 mm post-type connection.
ESD heel-strap (reusable 6 to 12 months).

I

I

9300-0980

9300-1383

9300-l 169

Returning Instruments for Service

Service Tag

If you are returning the instrument to Hewlett-Packard for servicing, fill in and attach a blue
service tag. Service tags are supplied in the back of this chapter.

Please be as specific as possible about the nature of the problem. If you have recorded any
error messages that appeared on the screen, or have completed a performance test record, or
have any other specific data on the performance of the spectrum analyzer, please send a copy
of this information with the unit.

Original Packaging

I

Before shipping, pack the unit in the original factory packaging materials if they are available.
If the original materials are unavailable, identical packaging materials may be acquired
through any Hewlett-Packard Sales and Service Office. Descriptions of the packaging materials
are listed in Figure 1-2.

1-6 General Information

Other Packaging

Caution

Repackage the spectrum analyzer in the original packaging materials or with commercially
available materials described in steps 4 and 5, below.

1. Attach a completed service tag to the instrument.

2. Install the front-panel cover on the instrument.

3. Wrap the instrument in antistatic plastic to reduce the possibility of damage caused by
electrostatic discharge.

4. Use the original materials or a strong shipping container that is double-walled, corrugated
cardboard carton with 159 kg (350 lb) bursting strength. The carton must be both large

enough and strong enough to accommodate the spectrum analyzer and allow at least

3 to 4 inches on all sides of the spectrum analyzer for packing material.

5. Surround the equipment with at least 3 to 4 inches of packing material, or enough to

prevent the equipment from moving in the carton. If packing foam is unavailable, the best

alternative is SD-240 Air

Air Cap looks like a plastic sheet covered with
pink-colored Air Cap to reduce static electricity. Wrap the equipment several times in this
material to both protect the equipment and prevent it from moving in the carton.

Spectrum analyzer damage can result from using packaging materials other
than those specified. Never use styrene pellets in any shape as packaging
materials. They do not adequately cushion the equipment or prevent it from

shifting in the carton. They cause equipment damage by generating static
electricity and by lodging in the spectrum analyzer fan.

Cap

from Sealed Air Corporation (Commerce, CA 90001).

TM

l-1/4

inch air-filled bubbles. Use the

6. Seal the shipping container securely with strong nylon adhesive tape.

7. Mark the shipping container
handling.

8. Retain copies of all shipping papers.

“FRAGILE, HANDLE WITH CARE” to assure careful

General Information 1-7

Item

Description

HP Part Number

I

1

2

r

Figure 1-2. Spectrum Analyzer Shipping Container and Cushioning Materials

1-6 General Information

3

9211-6969
9220-5073
9220-5072

Outer Carton
Pads (2)

Top Tray

Recommended Test Equipment

Table l-4 lists the recommended test equipment required for operation verification,
performance tests, adjustments, troubleshooting, and the Test and Adjustment Module. Any
equipment that meets the critical specifications given in the table can be substituted for the
recommended model(s). Operation verification, and the performance tests are located in the

Calibration Guide.

General Information l-9

Table l-4. Recommended Test Equipment

Instrument

sources

jynthesized sweeper

(two required)

;ynthesizer/level generator

iynthesized

signal generator

Critical Specifications

for Equipment Substitution

Frequency range:

10 MHz to 13.2 GHz

Frequency accuracy (CW): x
Leveling modes: Internal & External
Modulation modes: AM & Pulse
Power level range: -80 to

Frequency range: 200 Hz to 80 MHz
Frequency accuracy: 1 x
Flatness:
Attenuator accuracy:
External 10 MHz reference input
Frequency resolution: 1 Hz

Frequency range: 100
Residual SSB phase noise at 1 GHz:

<-73

<-lo7 dBc/Hz

<-124

<-124

f0.15

dBc/Hz

dBc/Hz
dBc/Hz

dB

<f0.09

at 10 Hz offset

at 1 kHz offset
at 10 kHz offset
at 100 kHz offset

+16

10e7/month

kHz

to 2.5 GHz

l0-g/day

dBm

dB

Xecommendec

Model

HP

8340A/B*

HP 83630A

opt 001, 008

HP 3335A+

HP 8663A

Use

PAT,

WV

PAT,

WV

p,v

‘&e/function generator

LM/FM signal generator

Part of microwave workstation

’ =

performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;

J =

operation verification

Frequency range: 10
Pulse width: 200 ns

3utput

amplitude: 5 V peak-to-peak

Functions: pulse & triangle

Pulse rise time: <lOO ns
I’TL sync output

Frequency range: 1 MHz to 200 MHz
Frequency modulation mode

Modulation oscillator frequency: 1 kHz

FM peak deviation: 5 kHz

kHz

to 50 MHz

HP 8116A

HP 8640B
HP 8642A

P,A

A

l-10

General Information

Table 1-4. Recommended Test Equipment (continued)

Instrument

Counters

Frequency standard

Microwave frequency counter

Universal counter

Receivers

spectrum

analyzer Frequency range: 300 kHz to 7 GHz

Critical Specifications

for Equipment Substitution

Output frequency: 10 MHz
Accuracy: <l x

Frequency range: 9 MHz to 7 GHz HP 5343A OR

External frequency reference input HP 5350B*

Timebase accuracy (aging): <5 x

Modes: TI
Time interval measurement range: 100 ns to 120 s
Frequency count range: 400 Hz to 11 MHz
Frequency resolution: 1 mHz

Timebase accuracy (aging): <3 x

External 10 MHz reference input

Amplitude range: -70 dBm to

10-l’

lo-“/day

A+B,

frequency count HP

10m7/month

+20 dBm

Recommended

Model

HP 5061B

Option 001

5334A/B

HP 8566B*

Use

PA

PAT,

WV

P

A,T

VIeasuring

iensors

‘ower

‘ower sensor

‘ower sensor

receiver

sensor Frequency range: 10 MHz to 13.2 GHz

Compatible w/power sensors

dB relative mode

Resolution: 0.01 dB
Reference accuracy:

Maximum SWR:

1.40 (10 to 30 MHz)

1.18 (30 to 50 MHz)

1.10 (50 MHz to 2 GHz)

1.18 (2 to 13.2 GHz)

Frequency range: 250 MHz to 350 MHz
Power range: 100 nW to 10
Maximum SWR: 1.15 (250 to 350 MHz)

Frequency range: 100 kHz to 2.9 GHz

Maximum S WR:

1.1 (1 MHz to 2.0 GHz)

1.30 (2.0 GHz to 2.9 GHz)

<fl.2%

PW

HP

8902A*

HP 8481A+

HP 8481D

HP

8482A*

PAT,

WV

PAT,

WV

P,A

PAT,

WV

’

Part of microwave workstation

’ =

performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;

J =

operation verification

General Information l-l 1

Table 1-4. Recommended Test Equipment (continued)

Instrument

Xher

Equipment

2ontroller

1scilloscope

Lmplifier

‘ower

supply Output voltage:

Required to run operation verification software.
No substitute.

Bandwidth (3
Two channels
Minimum vertical deflection factor: 55
Minimum
Digitizing display with time cursors
Delta-t cursor accuracy in 500

Frequency range: 2.0 to 8.0 GHz
Minimum output power (leveled)

2.0 to 8.0 GHz:

Output SWR (leveled):

Output voltage accuracy:

Critical Specifications

for Equipment Substitution

dB):

dc to 100 MHz

timebase

setting: <lOO ns

+16

dBm

<1.7

224

Vdc

<f0.2

ns/Div: <O.l ps

V

mV/div

Recommended

Model

HP

9816A,

HP

9836A/C,

HP 310,320
HP 332,360

HP 54501A*

HP 11975A

HP 6114A

Use

V

PAT

P

A

ignature

)igital

multimeter Clock frequency

Time interval function

voltmeter Range: -15 Vdc to

Accuracy:
Input impedance: 21 M

>lO

<fl

mV on 10 V range

MHz

+120

Vdc

D

?robes

)VM

test leads

ligh frequency probe

Part of microwave workstation

’ =

performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;

7 =

operation verification

236

inches, alligator clips, probe tips

No substitute

HP

5005A/B

HP

3456A*

HP 34118A

HP 85024A

T

A,T

A,T

T

1-12 General Information

Table 1-4. Recommended Test Equipment (continued)

Instrument

Accessories

Directional bridge

Directional coupler

(two required)

10 dB step attenuator

1 dB step attenuator

Critical Specifications

for Equipment Substitution

Frequency range: 1 to 80 MHz

Coupling: 6 dB (nominal)
Maximum coupling deviation: <
Directivity: 40 dB minimum
Impedance: 50 R (nominal)

Frequency range: 2.0 to 8.1 GHz
Coupling: 16.0 dB (nominal)
Maximum coupling deviation: fl dB (nominal)
Directivity: 14 dB minimum
Flatness: 0.75 dB maximum
VSWR:

fnsertion

Attenuation range: 30 dB
Frequency range: dc to 80 MHz
Connectors: BNC(f)

Attenuation range: 12 dB
Frequency range: dc to 80 MHz
Connectors: BNC(f)

<1.45

loss:

<1.3

dB

1 dB (nominal)

Recommended

Model

HP 8721A

0955-0098

HP 355D

HP 355C

Use

P

P

p,v

p,v

20 dB fixed attenuator

10 dB fixed attenuator

Reference attenuator

* Part of microwave workstation
P = performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;
V = operation verification

Frequency range: dc to 13.2 GHz
Attenuation accuracy:
Maximum SWR: 1.2 (dc to 2.9 GHz)

Frequency range: dc to 13.2 GHz
Attenuation accuracy:
Maximum SWR: 1.2 (dc to 2.9 GHz)

Supplied with HP 8481D

<fl

<f0.6

dB

dB

HP 8491B

Option 020

HP 8491B

Option 010

HP 11708A

p,v

p,v

P,A

General Information

l-1

3

Table 1-4. Recommended Test Equipment (continued)

Instrument

Termination

1

Low-pass filter

I

Jaw-pass

I

Jaw-pass

I

‘ower

s

iervice

7

Yuning

c

Zables

7

Test

C

:able, RG-214/U HP 11500A

C

:able

C

:able,

filter

(two required)

filter

(two required)

splitter

accessory kit
tool

cable

50 Sl coaxial

(jive required)

Frequency range: dc to 13.2 GHz
Impedance: 50

Maximum SWR:

Connector: Type N(m)

Cutoff frequency: 50 MHz
Rejection at 65 MHz:
Rejection at 75 MHz:

Cutoff frequency: 1.8 GHz
Rejection at >3 GHz:

0.1 dB ripple

Cutoff frequency: 4.4 GHz
Rejection at 5.5 GHz:

Frequency range: dc to 13.2 GHz
Output tracking:
insertion loss: 6 dB (nominal)
Equivalent output SWR:

No substitute
No substitute

Connectors: BNC(m)-to-SMB(f)
Length:
Connectors: Type N(m)
Length:

Connectors: SMA(m)

Length: 24 to 36 inches

?onnectors: BNC(m)

Length: 2 122 cm (48 in.)

Critical Specifications

for Equipment Substitution

52

<l.lO

>40

dB

>60

dB

>45

dB

>40

dB

<0.25

dB

<1.22

261

cm (24 in.)

291

cm (36 in.)

Recommendet

Model

HP

909A

0955-0306

0955-0491

HP 11689A

HP 11667B

08562-60021

8710-1010

85680-60093

8126-1578

HP 10503A

Use

P,M,V

P

P

A,T

A

AN

p,v

P

PAV

C

!able

(two required)

*

Part of microwave workstation

=

performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;

P
V= operation verification

rrequency

tiaximum SWR:

vlaximum

Yonuectors:

,ength: 2 61 cm (24 in.)

range: 30 Hz to 26.5 GHz

<1.4

at 26.5 GHz

insertion loss: 3 dB

APC 3.5(m), both ends

1-14 General Information

8120-4921

Table 1-4. Recommended Test Equipment (continued)

Instrument

Cable, HP-IB

(eight required)

Adapters
Adapter

Adapter

(three required)

Adapter
Adapter
Adapter
Adapter

(two required)

Adapter
Adapter
Adapter
4dapter

(two required)

4dapter

(two required)

4dapter
4dapter
4dapter

4dapter

4dapter
4dapter

(two required)

4dapter

(two required)

4dapter

4dapter
4dapter

4dapter
4dapter

Critical Specifications

for Equipment Substitution
Required w/operation verification software
Required

Length: 2 m (6.6 ft.)

Type N(f)-to-BNC(m)
Type N(m)-to-BNC(f)

Type N(f)-to-BNC(f)
Type N(m)-to-N(m)
Type N(f)-to-APC 3.5(m)
Type N(m)-to-APC 3.5(m)

Type N(m)-to-APC 3.5(f)
Type N(m)-to-BNC(m)
Type N(m)-to-N(f)
Type N(f)-to-APC 3.5(f)

Type N(m)-to-SMA(f)

Type N(f)-to-SMA(f)
BNC(f)-to-BNC(f)
BNC tee(f)(m)(f)
BNC(f)-to-SMA(m)
BNC(f)-to-dual banana plug
APC 3.5(f)-to-APC 3.5(f)

APC 3.5(m)-to-APC 3.5(m)

2.4 mm(f)-to-2.4 mm(f)
APC 3.5(f)-to-2.4 mm(f)
APC 3.5(m)-to-2.4 mm(f)
Type N(f)-to-2.4 mm(f)
Type N(f)-to-2.4 mm(m)

w/HP

85629B test & adjustment module

Recommendec

Model

HP 10833B

1250-1477
1250-1476

125@1474
125G1475

1250-1750
1250-1743

125G1744

1250-1473
1250-1472
1250-1745

1250-1250

1250-1772
1250-0059 A
12560781
1250-1200
1251-2816
5061-5311

1250-1748

HP 11900B
HP 11901B
HP 11901D
HP 11903B
HP 11903C

Use

PAM

P,A

P,A,V

p,v

P

A

P,M,V

p,v

P
P

p,v

p,v

P

‘AM,\

PAV

A,T

P,M,V

p,v

‘,A,T,V

P
P

‘,.%T,V

P

’ Part of microwave workstation
’ =

performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;

J =

operation verification

General Information 1-15

Sales and Service Offices

Hewlett-Packard has sales and service offices around the world providing complete support
for Hewlett-Packard products. To obtain servicing information, or to order replacement
parts, contact the nearest Hewlett-Packard Sales and Service Office listed in Table l-5. In

any correspondence, be sure to include the pertinent information about model numbers, serial
numbers, and assembly part numbers.

Note

Within the USA, a toll-free phone number is available for ordering
replacement parts. Refer to the section entitled, “Ordering Information” in

Chapter 5, “Replaceable Parts,”

for the phone number and more information.

1-16 General Information

Table 1-5. Hewlett-Packard Sales and Service Offices

US FIELD OPERATIONS

Headquarters

Hewlett-Packard Co. Hewlett-Packard Co.

19320 Pruneridge Avenue 301 E. Evelyn
Cupertino, CA 95014 Mountain View, CA 94041
[phone] [phone]

Colorado

Hewlett-Packard Co.
24 Inverness Place, East
Englewood, CO 80112
[phone]

New Jersey

Hewlett-Packard Co.
150 Green Pond Rd.
Rockaway, NJ 07866
(201)

5865400

California, Northern

Atlanta Annex

Hewlett-Packard Co.
2124 Barrett Park Drive
Kennesaw, GA 30144
[phone]

Texas

Hewlett-Packard Co.
930 E. Campbell Rd.
Richardson, TX 75081
[phone]

California, Southern

Hewlett-Packard Co.
1421 South Manhattan Ave.
Fullerton, CA 92631
[phone]

Illinois

Hewlett-Packard Co.
545 E. Algonquin Rd.
Arlington Heights, IL 60005
[phone]

EUROPEAN FIELD OPERATIONS

Headquarters

Hewlett-Packard S.A. Hewlett-Packard France
150, Route du Nant-d’Avri1 1 Avenue Du Canada Hewlett-Packard
1217 Meyrin 2/Geneva Zone
Switzerland

(41 22) 780.8111

France

D’Activite

F-91947 Les

France
(33 1) 69 82 60 60

UIis

De Courtaboeuf

Cedex

Germany

Hewlett-Packard GmbH

61352 Bad Homburg v.d.H
Germany
(49 6172) 16-O

Great Britain

Hewlett-Packard Ltd.

EskdaIe

Road, Winnersh Triangle
Wokingham, Berkshire RG41 5DZ
England

(44

734) 696622

Strasse

INTERCON

Headquarters

Hewlett-Packard Company
3495 Deer Creek Road

‘alo

Alto, California, USA

34304-1316

1415)

857-5027

China

China

Hewlett-Packard Company Hewlett-Packard Japan, Ltd.

$8 Bei

San Huan Xl Road

;huang Yu Shu Tokyo 192, Japan
Iai Dian District
3eijing,

China

86 1) 256-6888

Australia

Hewlett-Packard Australia Ltd.
31-41 Joseph Street
Blackburn, Victoria 3130
(61 3) 895-2895

Japan

9-l Takakura-Cho, Hachioji

(81 426) 60-2111

FIELD OPERATIONS

raiwan

Hewlett-Packard Taiwan

lth

Floor, H-P Building
137 Fu Hsing North Road

Taipei,

Taiwan

886 2) 712-0404

Canada

Hewlett-Packard (Canada) Ltd.
17500 South Service Road
Tram-Canada Highway
Kirkland, Quebec
Canada
[phone]

H9J 2X8

Singapore

Hewlett-Packard Singapore (Pte.) Ltd.
150 Beach Road
#29-00 Gateway West
Singapore 0718
(65) 291-9088

General Information 1-17

2

Adjustment Procedures

Introduction

This chapter contains information on automated and manual adjustment procedures. Perform

the automated procedures using the HP 85629B test and adjustment module (TAM). Never
perform adjustments as routine maintenance. Adjustments should be performed after a repair
or performance test failure. Refer to Table 2-l to for which adjustments to perform.

Automated Procedures

Using the TAM
Front End Cal (adjustment)

Manual Procedures

1. High Voltage Power Supply Adjustment

2. Display Adjustment

3. IF

4. IF Amplitude Adjustments

5. DC Log Amplifier Adjustments

6. Sampling Oscillator Adjustment

7. YTO Adjustment

8. LO Distribution Amplifier Adjustment

9. Frequency Response Adjustment

10. Calibrator Amplitude Adjustment

11. 10 MHz Reference Adjustment-OCXO

12. 10 MHz Reference Adjustment-TCXO (Option 103)

13. Demodulator Adjustment

14. External Mixer Bias Adjustment

15. External Mixer Amplitude Adjustment

16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment

17. 16 MHz PLL Adjustment

18. 600 MHz Reference Adjustment

Bandpass

Adjustment

Note

Before performing any adjustments, allow the spectrum analyzer to warm up

for at least 5 minutes.

Adjustment Procedures 2-1

Safety Considerations

Although this instrument has been designed in accordance with international safety standards,
this manual contains information, cautions, and warnings which must be followed to ensure
safe operation and to prevent damage to the instrument. Service and adjustments should be
performed only by qualified service personnel.

w

Warning

Adjustments in this section are performed with power supplied to the

instrument and protective covers removed. There are voltages at many points
in the instrument which can, if contacted, cause personal injury. Be extremely
careful. Adjustments should be performed only by trained service personnel.

w

Power is still applied to this instrument with the (LINE) switch in the off

position. Before removing or installing any assembly or printed circuit board,
remove the line-power cord.

w

Capacitors inside the instrument may still be charged, even if the instrument

has been disconnected from its source of supply.

n

Use a nonmetallic adjustment tool whenever possible.

Which Adjustments Should Be Performed?

Table 2-l lists the manual adjustments that should be performed when an assembly is repaired
or changed. It is important to perform the adjustments in the order indicated to ensure that
the instrument meets its specifications.

Test Equipment

The equipment required for the manual adjustment procedures is listed in Table 1-4,

“Recommended Test Equipment

given in the table may be substituted for the preferred test equipment.

Any equipment that satisfies the critical specifications

.”

Adjustable and Factory-Selected Components

Table 2-2 lists the adjustable components by reference designation and name. For each
component, the table provides a description and lists the adjustment number.

Refer to Table 2-3 for a complete list of factory-selected components used in the instrument
along with their functions. Factory-selected components are identified with an asterisk on the

schematic diagrams.

2-2 Adjustment Procedures

Adjustment Tools

For adjustments requiring a nonmetallic tuning tool, use fiber tuning tool, HP part number

8710-0033.

Two different tuning tools may be necessary for IF
the type of tuning slug used in the slug-tuned inductors. If the tuning slug requires a slotted
tuning tool, use HP part number 8710-1010. If the tuning slug requires a forked tuning tool,
use HP part number 8710-0772.

Never try to force an adjustment control. This is especially critical when tuning variable
capacitors or slug-tuned inductors. Required service accessories, with part numbers, are listed

under “Service Kit” in Chapter 1, “General Information.”

bandpass

adjustments, depending upon

Instrument Service Position

Refer to Chapter 4, “Assembly Replacement ,”for information on removing the spectrum
analyzer cover assembly and accessing all internal assemblies.

Adjustment Procedures 2-3

Table 2-1. Related Adjustments

Assembly Changed

or Repaired

AlAl

keyboard

AlA

RPG

A2 controller

A3 interface

A4 log

A5 IF

A6 power supply

A6Al

A7 switched LO

amp/Cal

HV module

distribution amplifiei

osc

Perform the following related adjustments in the order listed

!Io

related adjustment

vo related adjustment

16 MHz PLL adjustment
Display adjustment

[f

EEROM from old A2 controller could not be used in
new A2 or if EEROM must be replaced, also perform
the following adjustments:
LO distribution amplifier adjustment
External mixer amplitude adjustment
YIG-tuned filter/mixer adjustment
Frequency response adjustment

Display adjustment (fast zero span)

Frequency response adjustment
Display adjustment (Fast Zero Span)
Demodulator adjustment

1F

amplitude adjustment

DC log amplifier adjustment

1F bandpass
[F

amplitude adjustment
High voltage power supply adjustment
Display adjustment
High voltage power supply adjustment
Display adjustment
LO distribution amplifier adjustment
Frequency response adjustment (or perform the

frequency response performance test in the

HP 8560 E-Series Spectrum Analyzer Calibration Guide.

The adjustment must be performed if the performance test fails.:

adjustment

4djustment

Number

17

2

8
15
16

9

2

9

2
13

4

5

3

4

1

2

1
2
8
9

2-4 Adjustment Procedures

Table 2-1. Related Adjustments (continued)

Assembly Changed

or Repaired

A8 low band mixer
A9 input attenuator

A10 RYTHM

All YTO
Al3 2nd converter
Al4 frequency control

Al5 RF

A15UlOO

sampler

Perform the following related adjustments in the order listed

Frequency response adjustment
Frequency response adjustment (or perform the

frequency response performance test in the

HP 8560 E-Series Spectrum Analyzer Calibration Guide.

The adjustment must be performed if the performance test fails

YIG-tuned filter/mixer (RYTHM) adjustment
Frequency response adjustment
YTO adjustment
Frequency response adjustment
Display adjustment (fast zero span)

YTO adjustment

LO distribution amplifier adjustment
Frequency response adjustment

10 MHz reference adjustment (TCXO, Option 103)

600 MHz reference adjustment
Calibrator amplitude adjustment

External mixer bias adjustment
Sampling oscillator adjustment
External mixer amplitude adjustment
Frequency response adjustment

Sampling oscillator adjustment

Adjustment

Number

9
9

16

9
7
9
2
7
8

9

12

18
10
14

6

15

9

6
Al7 CRT driver

A18Vl

CRT

A19 HP-IB

A21 OCXO

Display adjustment
Display adjustment
No related adjustment

10 MHz reference adjustment (OCXO)

2

2

11

Adjustment Procedures 2-5

Table 2-2. Adjustable Components

Reference

Designator

A2R152

A2R206

A2R209

A2R215
A2R218

A2R262

A2R263

A2R268

A2R271

A4C707
A4R445
A4R531
A4R544
A4R826

A5L300

A5L301

A5L700

A5L702

A5R343

A5T200

A5T202

Adjustment

Name

16 MHz PLL ADJ

DGTL X GAIN
SWEEP OFFSET

DGTL Y GAIN
VIDEO OFFSET

STOP BLANK

START BLANK

VIDEO GAIN

SWEEP GAIN

FM DEMOD
LIMITER PHASE
LOG AMP TOS
LIN FIDELITY BOW
CAL OSC AMPTD

LC CTR 1

LC CTR 2

LC CTR 3

LC CTR 4

15 DB ATT

XTAL CTR 1

XTAL CTR 2

Adjustment

Number

17

2

2

2
2

2

2

2

2

13

5
5
5
4

3

3

3

3

4

3

3

Description

Adjusts the free-running frequency of the
16 MHz CPU clock.

Adjusts the horizontal gain in the X line generator.
Adjusts the beginning of the trace to the leftmost
vertical graticule line in fast-analog zero-span mode.
Adjusts the vertical gain in the Y line generator.
Adjusts the vertical position in fast-analog zero
span to match the digital zero-span input.
Adjusts the blanking at the end of a vector on
the display.
Adjusts the blanking at the start of a vector on
the display.
Adjusts the vertical gain in fast-analog zero span
to match with the digital zero-span input.
Adjusts the end of the trace to the rightmost
vertical-graticule line in fast-analog

zero-span mode.
Adjusts the FM demodulation for a peak response.

Adjusts Limiter Phase for peak response.
Minimizes error to Top of Screen.
Minimizes Linearity Fidelity error.
Sets calibration oscillator output power

(nominally -35
the IF during the AUTO IF ADJUST routines.
Adjusts center frequency of first stage of LC
bandwidth filter to 10.7 MHz.
Adjusts center frequency of second stage of LC
bandwidth filter to 10.7 MHz.
Adjusts center frequency of third stage of LC
bandwidth filter to 10.7 MHZ.
Adjusts center frequency of fourth stage of LC
bandwidth filter to 10.7 MHz.
Adjusts the attenuation of the reference 15 dB
attenuator for 15 dB between minimum and

maximum attenuation.
Adjusts center frequency of first stage of crystal
bandwidth filter to 10.7 MHZ.
Adjusts center frequency of second stage of crystal
bandwidth filter to 10.7 MHZ.

dBm).

This power is injected into

2-6 Adjustment Procedures

Table 2-2. Adjustable Components (continued)

Reference

Designator

A5T500

A5T502

A6R410

A14R42 6.01 GHz

A14R76

A14R93

A15ClOO

A15C210

A15C750 vcxo
A15C751
A15U302

A15R561

A15R926
A17R4

A17Rll
A17R21
A17R26
A17R34
A17R55
A17R57
A17R75
A17R77
A17R90
A17R92
A17R93

Adjustment

Name

XTAL CTR 3

XTAL CTR 4

HV ADJ

FM SPAN

3.2 GHz

SMPL MATCH

VCO RANGE

TRIPLER
10 MHz ADJ

CAL AMPTD

EXT BIAS ZERO

2

GAIN
CUTOFF
Z FOCUS
X FOCUS
COARSE FOCUS
X GAIN
X POSN
Y GAIN
Y POSN
TRACE ALIGN
DDD
ASTIG

Adjustment

Number

3

3

1

7

7

7

6

6

18
18
12

10

14

2
2
2
2
2
2
2
2
2
2
2
2

Description

Adjusts center frequency of third stage of crystal
bandwidth filter to 10.7 MHz.
Adjusts center frequency of fourth stage of crystal
bandwidth filter to 10.7 MHz.

Adjusts the voltage between A6TP405 and A6TP401
to the voltage marked on the

module.

Adjusts the main coil tune driver current at a
YTO frequency of 6.01 GHz (near the upper YTO
frequency limit).

Adjusts the FM span accuracy by affecting the
sensitivity of the FM coil driver.

Adjusts the main coil fixed driver current at a
YTO frequency of 3.2 GHz (near the lower
YTO frequency limit).
Transforms the sampler input impedance to 50 ohms
over the 285 to 297.2 MHz range.
Adjusts the VCO tank capacitance so that 21V
on the VCO tune line equals 298 MHz VCO frequency.
Adjusts for maximum 600 MHz reference output.
Adjusts for maximum 600 MHz reference output.
Adjusts frequency of the temperature
compensated crystal oscillator (TCXO) to 10 MHz.
Adjusts amplitude of the 300 MHz calibrator signal
to -10.0
Adjusts zero bias point of external mixer bias.

Adjusts maximum intensity.
Adjusts intensity to turn off blanked lines.
Adjusts focus for lines of different brightness.
Adjusts focus at the left and right corners of the display.
Adjusts focus at the center of the display.
Adjusts the horizontal-deflection amplifier gain.
Adjusts the CRT horizontal position.
Adjusts the vertical-deflection amplifier gain.
Adjusts the CRT vertical position.
Adjusts the display axis rotation.
Adjusts focus of the center of the display.
Adjusts for the spot roundness on the CRT display.

dBm.

A6Al

high voltage

Adjustment Procedures 2-7

Table 2-3. Factory Selected Components

Reference

Designator

A5C204
A5C216
A5C326
A5C327
A5C505
A5C516
A5C717
A5C718

Adjustment

Number

3
3
3
3
3

Basis of Selection

Selected to optimize center frequency of LC tank that loads the crystal.

Selected to optimize center frequency of LC tank that loads the crystal.

Selected to optimize LC pole center frequency.

Selected to optimize LC pole center frequency.
Selected to optimize center frequency of LC tank that loads the crystal.
Selected to optimize center frequency of LC tank that loads the crystal.

Selected to optimize LC pole center frequency.
Selected to optimize LC pole center frequency.

2-6 Adjustment Procedures

Using the TAM

The HP 85629B TAM, in conjunction with the HP

(TAM I/F SW), can be used to perform approximately half of the spectrum analyzer
adjustment procedures. Table 2-4 lists the TAM adjustments and their corresponding manual
adjustments. Refer to Chapter 7, “General Troubleshooting,” for information on loading and

running the TAM I/F SW.
The TAM adjustments do not include procedures for choosing factory-selected components. If

an adjustment cannot be made and a factory-selected component must be changed, refer to

the corresponding manual adjustment.

To select an adjustment, press

Position the pointer next to the desired adjustment using either the knob or step keys. Press

EXECUTE,

then follow the instructions displayed on-screen.

(m)

to display the TAM main menu, then press

8562E/TAM

Interface Software

AMUST.

Test Equipment

During the TAM adjustments, instructions for setting test equipment controls are displayed.

Table 2-5 lists the test equipment needed to perform each TAM adjustment. Required models
must be used. Substitutions may be made for recommended models. Substitute sources
must operate over the frequency ranges indicated. Recommended substitutes are listed in
the configuration menu. If you must substitute the source with a user-defined model, the
adjustments run faster using a synthesized source rather than an unsynthesized source.

Note

When connecting signals from the HP
to the adjustment, setup, use a high-frequency test cable with minimum
attenuation to 26.5 GHz. HP part number 8120-4921 is recommended for its
ruggedness, repeatability, and low insertion loss.

8340A/B

(or any microwave source)

Adjustment Indicator

To aid in making adjustments, the TAM displays an
the left-hand side of the display. A horizontal line moves inside the box to represent the
needle of an analog voltmeter. A digital readout appears below the box. Tick marks are often
displayed on the inside edges of the box indicating the desired needle position. (The tick
marks and needle are intensified when the needle is within this acceptable region.) During

some adjustments, an arrow appears along the right edge of the box. This arrow always
indicates the highest position the needle has reached. The arrow is useful when a component
must be adjusted for a peak response; if the peak is overshot, the arrow indicates where the
peak was. The component can be readjusted until the needle is at the same position as the

arrow.

“Analog Voltmeter Display Box” along

Adjustment Procedures

2-9

Table 2-4. TAM Adjustments

TAM Adjustment

1. IF bandpass, LC poles

2. IF bandpass, crystal poles

3. IF amplitude

4. Limiter phase

5. Linear fidelity

6. Log fidelity

7. Sampling oscillator

8. YTO

9. LO distribution amplifier

10. Low band flatness*

11. High band flatness and YTF*

12. Calibrator amplitude

13. 10 MHz reference oscillator

14. External mixer bias

15. External mixer amplitude
‘These TAM adjustments are not compatible with the HP 85623.

Either perform the manual adjustment, or use the frequency response
adjustment software described in Chapter 3, “Frequency Response Adjustment Software.”

Corresponding

IF

bandpass

IF

bandpass

IF amplitude adjustment
DC log amplifier adjustments, A4 limiter phase
DC log amplifier adjustments, A4 linear fidelity
DC log amplifier adjustments, A4 log fidelity
Sampling oscillator adjustment

YTO adjustment

First LO distribution amplifier adjustment
Frequency response adjustment
Frequency response adjustment

YIG-tuned filter/mixer adjustment

Calibrator amplitude adjustment
10 MHz reference adjustment - TCXO

External mixer bias adjustment
External mixer amplitude adjustment

adjustment
adjustment

(Option 103)

Manual Adjustment

Adjustment

Number

3

3
4
5
5
5
6
7
8
9
9

16
10

12

14
15

,

2-10 Adjustment Procedures

Table 2-5. Required Test Equipment for TAM

10. Low band flatness

11. High band flatness

12. Calibrator amplitude Power meter

13. 10 MHz reference
Oscillator (9 to 11 MHz)

14. External mixer bias

15. External mixer amplitude Power meter HP 8902A, HP 436A,

Not applicable

Power sensor (300 MHz) HP 8482A,

HP 8481A

Frequency counter

Manual probe cable

Power sensor HP 8481D, HP 8484A

(310.7 MHz, -25 to -35

Source (310.7 MHz, -30

dBm)

dBm)

5001-

8743

Not Applicable
HP 8902A, HP

HP 438A

HP 5342A, HP 5343A

HP 438A

HP

8340A/B

436A,

Adjustment Procedures

2-l

1

Front End Cal (adjustment)

This procedure automates two manual procedures:

YIG-Tuned Filter/Mixer (RYTHM) Adjustment. This procedure is described in Chapter 3,

“Frequency Response Adjustment Software.”

Frequency Response Adjustment, and

2-12 Adjustment Procedures

1. High Voltage Power Supply Adjustment

1. High Voltage Power Supply Adjustment

Assembly Adjusted

A6 power supply

Related Performance Test

There is no related performance test for this adjustment.

Description

The high voltage power supply is adjusted to the voltage marked on the
The

A6Al

HV module is characterized in the factory to ensure that the display filament

voltage is set to 6.0 V rms when the

+llO

Vdc (

nominal) supply is set to the voltage marked

on the HV module.

n

Warning

To minimize shock hazard, use a nonmetallic adjustment tool when adjusting

the A6 power supply.

n

The following procedure probes voltages that, if contacted, could cause

personal injury or death.

w

Note

Adjustment of the high voltage power supply should not be a routine

maintenance procedure. Any adjustments should be done only if the A6
power supply,

A6Al

HV module, or

A18Vl

CRT (display) is repaired or

replaced.

n You must perform the display adjustments after this adjustment if either the

display or HV module has been replaced.

PO%= A6TP405

A6Al

HV module.

DIGITAL VOLTMETER

fEz*-

Figure 2-1. High Voltage Power Supply Adjustment Setup

DVM TEST LEADS

SPECTRUM ANALYZER

J

SK1 1

Adjustment Procedures 2-13

1. High Voltage Power Supply Adjustment

Equipment

Digital multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

DVMtestleads

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 34118A

Procedure
Warning

1. Turn the spectrum analyzer off by pressing
remove the spectrum analyzer cover. Fold down the A2 controller, A3 interface, A4 log

amplifier/Cal oscillator, and A5 IF assemblies. Remove the A6 power supply cover.

2. Position the spectrum analyzer as shown in Figure 2-l. Connect the positive DVM lead to

A6TP405

3. Set the HP 3456A controls as follows:

Function
Range

4. Reconnect the power cord to the spectrum analyzer and press

5. Record the voltage marked on the

6. Adjust A6R410 HV ADJ for a voltage equal to the voltage recorded in step 5.

7. Press
30 seconds for the high voltage power supply capacitors to discharge.

ILINE)

After disconnecting the ac power cord, allow capacitors in the high voltage
supply to discharge for at least 30 seconds before removing the protective
cover from the A6 power supply.

LuNE].

Disconnect the power cord and

and the negative DVM lead to

....................................................

.....................................................

A6Al

to turn the spectrum analyzer off and disconnect the power cord. Wait at least

A6TP401.

m

to the on position.

HV module.

Voltage marked on A6Al HV Module

DCVOLTS

1OOOVOLTS

=

Vdc

8. Disconnect the DVM test leads from
cover.

2-14 Adjustment Procedures

A6TP401

and

A6TP405.

Reinstall the power supply

2. Display Adjustment

Assembly Adjusted

A2 controller
Al7 CRT driver

Related Performance Test

2. Display Adjustment

Sweep Time Accuracy (Sweep Times

<30

ms)

Description

Coarse adjustment of the deflection amplifiers, Z-axis amplifiers, and line generators is done
using the CRT adjust pattern. Fine adjustments use the graticule. The fast zero-span
amplitude adjustments correct for differences between analog and digital display modes. The
displayed sweep time accuracy is adjusted in the fast zero-span sweep adjustments.

SPECTRUM
ANALYZER

SK12

Figure 2-2. Display Adjustment Setup

Equipment

10 dB VHF step attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 355D

Adapters

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Cables

BNC, 122 cm (2 required)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Adjustment Procedures 2-15

2. Display Adjustment

Procedure
Note

1. Turn the spectrum analyzer off by pressing (LINE). Remove the spectrum analyzer cover
and fold out the A2 controller and A3 interface assemblies as illustrated in Figure 2-2.
Connect the CAL OUTPUT to the INPUT. Adjustment locations are shown on the CRT

neck for Al7 adjustments and in Figure 2-4 for the A2 adjustments.

Perform the 16 MHz PLL Adjustment in this chapter before proceeding with
this adjustment.

Preliminary Adjustments

2. Set A17R55 X GAIN, A17R75 Y GAIN, A17R92 DDD, A17R93 ASTIG, A2R206 DGTL
X GAIN, A2R215 DGTL Y GAIN, A2R262 STOP BLANK, and A2R263 START
BLANK to midrange. Also set the rear-panel X POSN, Y POSN, and TRACE ALIGN to
midrange.

3. Set A17R21 Z FOCUS, A17R26 X FOCUS, and

4. Set A17R4 Z GAIN fully clockwise.

5. Turn the spectrum analyzer on and allow it to warm up for at least 3 minutes. Adjust

A17Rll

possible focus.

CUTOFF until the display is visible and A17R34 COARSE FOCUS for best

A17Rll

CUTOFF to midrange.

Cutoff Adjustment

6.

Press

(PRESET),

FOCUS, 127
until the retrace line between the bottom of trace A and the annunciators at the bottom
of the display just disappears.

(DISPLAY),

[ENTER),

STORE

IImNSITY

FOCTJS,

, 255

then GRAT OM OFF (OFF). Adjust

(ENTER),

STORE

IIfTEMSITY

, MORE 1 of 2,

A17Rll

CUTOFF

Deflection Adjustments

7.

Press

8. Refer to Figure 2-3 for locating the lines used for adjusting DGTL X GAIN and DGTL Y

9. Adjust A2R206 DGTL X GAIN until the two vertical lines near the left edge of the

10. Adjust A2R215 DGTL Y GAIN until the two horizontal lines near the top edge of the

11. Adjust A2R262 STOP BLANK and A2R263 START BLANK for the sharpest corners of

GRAT

ON OFF (ON),

ICAL), MO&F, I

the adjustments on the A2 controller assembly.

GAIN. Each of these lines is actually two lines adjusted for coincidence. The two lines will

form an “X” if they are not adjusted properly.

display converge to one single line.

display converge to one single line.

the outer box in the test pattern. The intensity of the corners should be the same as the
middle of the lines between the corners.

of 2 , and CRT

MORE

2 of 2 , INTENSITY, 80 (ENTER), STORE

ADJ

PATTERN . Fold up the A3 interface assembly to access

INmSITY

,

2-16 Adjustment Procedures

2. Display Adjustment

12. Adjust the rear-panel TRACE ALIGN

until the leftmost line of the test pattern is parallel

with the CRT bezel. See Figure 2-3.

13. Adjust the rear-panel X POSN and A17R55 X GAIN until the leftmost
and the

14. Adjust the rear-panel Y POSN and A17R75 Y GAIN until the

softkey

labels appear just inside the left and right edges of the CRT bezel.

softkey

“@”

labels align with

their appropriate softkeys.

15. Press

[PRESET).

If necessary, readjust STOP BLANK and START BLANK for the
best-looking intersection of the graticule lines. This will be most noticeable along the
center vertical and horizontal graticule lines.

DEFLECTION ADJUSTMENTS

Adjust START BLANK

and STOP BLANK for
sharp corners

Adjust DGTL Y GAIN

until only one

line appears

/

/

characters

Adjust
DGTL X GAIN
until only one
line appears

Adjust TRACE ALIGN

to place this line

parallel to left

edge of CRT bezel

\ I

V

Adjust MIN

until dots in these

areas just disappear

Figure 2-3. CRT Adjust Pattern

INTEN

SOFTKEY

SOFTKEY

SOFTKEY
SOFTKEY

SOFTKEY

1

2
3

4
5

EXIT

SK13

Adjustment Procedures 2-17

2. Display Adjustment

Intensity Adjustments

16.

Press

(AMPLITUDE)

should almost completely fill the screen with the noise floor. Press

A17R4 2 GAIN until the intensity at the center of the screen is about medium. It

should be fully illuminated, but not so bright that it burns the screen (15
photometer/radiometer).

then set the

REF LVL

to -70 dB and the LOG

d&‘DIV

(SGL).

to 1. This

Adjust

NITS

on a

17. Press (CAL), MORE I of 2 , and CRT
HP logo. Adjust A17R93 ASTIG for the smallest round dot possible.

18. Adjust A17R34 COARSE FOCUS and A17R92 DDD for the best focus of the characters
at the center of the screen.

19. Adjust A17R21 Z FOCUS for the best focus of the test pattern outside box.

20. Adjust A17R26 X FOCUS for best focus of the
pattern.

21. Repeat steps 17 through 20 to obtain the best overall focus quality.

ADJ

PATTERN. Locate the dot just below the

“0”

characters at the corners of the test

2-18 Adjustment Procedures

2. Display Adjustment

AZR206

DGTLY GAIN

A2R215

DGTLY

GAlN

A2R263

START BLANK

AZR262 AZR268

STOP BLANK

VIDEO GAIN

SK14

Figure 2-4. A2 Display Adjustment Locations

Fast Zero Span Adjustments

22. Set A2R209 SWEEP OFFSET, A2R218 VIDEO OFFSET, and A2R268 SWEEP GAIN
to midrange. Adjustment locations are shown in Figure 2-4 for these A2 adjustments.

23. Set the HP 355D to 30 dB attenuation.

24. Press

(PRESET)

on the spectrum analyzer,

Figure 2-2. Set the spectrum analyzer controls as follows:

Centerfrequency
Span

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

Reference level
Resolution bandwidth
Videobandwidth
Sweep time

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms

and connect the equipment as shown in

..300MHz

dBm

300Hz

Adjustment Procedures 2-19

2. Display Adjustment

25. Press

26.

27. Set the sweep time to 10 ms.

(MKR), [m),

MARKER

MARKER-, REF

Press

(SAVE), SAVE STATE

LVL

again.

4

,and

REF

LYL. If the marker is not at the top graticule, press

STATE 0.

28. Press

29. Adjust A2R209 SWEEP OFFSET to place the beginning of the trace at the leftmost

30. Adjust A2R271 SWEEP GAIN to place the end of the trace at the tenth vertical graticule

31. Press

32.

33.

34.

35.

36. Adjust A2R209 and A2R271 until the start of sweep is aligned to the leftmost vertical

37. Press STATE 2 and STATE 3. The two traces should be aligned within

(SAVEI,

vertical graticule line.

line (one division from the right edge of the graticule).

Press

Set the sweep time to 50 ms. Press

Press

Switch between STATE 1 and STATE 2. Adjust A2R268 and A2R218 so that the trace in

state 1 is lined up with the top line of the graticule and the state 2 trace is lined up with
the eighth graticule down from the top (counting the top line). Repeat until the traces
align to within f0.2 divisions.

graticule line and the end of the sweep is aligned with the right most vertical graticule
line.

SAVE STATE

6-1

(SAVE),

SAVE STATE

and press the @) key seven times.

,and

,and

STATE

STATE

ISAVE),

[RECALL), RECALL STATE

,and

1.

2.

SAVE STATE, and STATE 3.

STATE

1.

4~0.1

divisions.

38.

Press STATE 0 and STATE

2-20 Adjustment Procedures

1

. The two traces should be aligned within fO.l divisions.

3. IF

Bandpass

Adjustment

3. IF

Bandpass

Adjustment

Assembly Adjusted

A5 IF assembly

Related Performance Test

Resolution bandwidth accuracy and selectivity

Description

The center frequency of each IF

diodes and an inductor (for the LC poles) or a transformer (for the crystal poles). The
inductors and transformers are for coarse tuning and the varactors are for fine tuning by the
microprocessor. The inductors and transformers are adjusted such that the varactor diodes

are biased near the middle of their capacitance range. The varactor diode bias is measured
with the DVM.

Note

This procedure is not a routine adjustment. It should be performed only
if repairs to the A5 IF assembly are made. If the entire A5 IF assembly is
replaced, the assembly arrives pre-adjusted from the factory and requires no
further adjustment.

bandpass

filter pole is adjusted by DAC-controlled varactor

SPECTRUM

ANALYZER

5if BOARD

A3

-

A2

Figure 2-5. IF Bandpass Adjustment Setup

Equipment

Digital voltmeter

DVMtestleads

Special tuning tool (for slot-type tuning slugs)
Special tuning tool (for fork-type tuning slugs)

................................................

................................................

DVM

TEST LEADS

DIGITAL VOLTMETER

.......................

.......................

I

SK15

HP 3456A

HP 34118A

8710-1010
8710-0772

Adjustment Procedures 2-21

3. IF

Bandpass

Procedure

Adjustment

1. Turn the spectrum analyzer off by pressing

@.

Disconnect the power cord. Remove the
spectrum analyzer cover and fold down the A2 controller, A3 interface, A4 log amp, and
A5 IF assemblies. Reconnect the power cord. Turn the spectrum analyzer on and allow it
to warm up for at least 30 minutes.

2. Connect the negative DVM lead to pin 6 of

A5J6.

See Figure 2-5 and Figure 2-6. Set the

HP 3456A controls as follows:

Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1OV

3. On the spectrum analyzer press,

(-1,

l=),

2,

LMHz), ICAL),

and IF

AD3

IX OFF so

OFF is underlined.

PIN 2

. . l . . . . . PIN 16

PIN 1 n . . .

l .m

Figure 2-8. TAM Connector Pin Locations

LC Bandpass Adjustments

SP114E

4.

On the spectrum analyzer, press

AD3

CURR IF STATE.

message to disappear before continuing with the next step.

5. Read the voltage on
less than

+6.26

t6.06

Vdc, turn LC CTR 1 counterclockwise.

A5TP5

(thisis an empty-hole type of test point). If the voltage is

Vdc, turn A5L300 LC CTR 1 clockwise. If the voltage is greater than

6. Repeat steps 4 and 5 until the voltage reads i-6.16 Vdc

Note

If the range for the LC CTR adjustment is insufficient, replace the
appropriate factory-selected capacitor as listed in Table 2-6. To determine
the correct replacement value, center the LC CTR adjustment and press

AD3 CURR

IF STATE. After the IF ADJUST STATUS message disappears, read

the DVM display. Choose a capacitor value from Table 2-7, based on the
DVM reading and the presently loaded capacitor value. Table 2-10 lists a few
capacitor part numbers.

Caution

Turn the spectrum analyzer off by pressing luNE) to the off position before
removing or replacing any shield.

7. Move the positive DVM lead to

8. Adjust

A5L301

LC CTR 2 by repeating steps 4 through 6.

A5TP6.

Wait for the

flO0

mV.

IF ADJUST STATUS

9. Move the positive DVM test lead to

A5TP2

is is a resistor-lead type of test point).

(th

10. Adjust A5L700 LC CTR 3 by repeating steps 4 through 6.

2-22 Adjustment Procedures

3. IF

Bandpass

Adjustment

11. Move the positive DVM test lead to

A5TPl

(this is a resistor-lead type of test point).

12. Adjust A5L702 LC CTR 4 using the procedure in steps 4 through 6.

Table 2-6. Factory-Selected LC Filter Capacitors

LC

CTR Adjustment Fixed Factory Select Capacitor

A5L300
A5L301
A5L700
A5L702

LC CTR 1

LC CTR 2

LC CTR 3
LC CTR 4

A5C326
A5C327
A5C717
A5C718

Table 2-7. LC Factory-Selected Capacitor Selection

DVM Reading (V)

0 to 1.5

1.5to2.5

2.5to3.5

3.5to4.5

4.5to5.5

Replace Replace

6.8 with: 8.2 with:
*

18 18
15 15 18 18 * *
10 12 15 15 18 *

8.2

Currently Loaded Capacitor Value (pF)

Replace Replace

10

with:

*

*
*

12

with:

*

* * *

Replace

15

with:

* *

10 12 15 18

Replace Replace

18

with:

20

with:

*
*
*
*

*

*

5.5 to 6.5

6.5 to 7.5

7.5to8.5

8.5to9.5

9.5to10 *

No change No change No change No change No change No change No change
No change No change No change No change No change No change No change

*
*

6.8 8.2
*
*

6.8 8.2

6.8

10 12 15 18

12 15 18

8.2

10 12 15

* Indicates a condition that should not, exist; suspect broken hardware.

XTAL Bandpass Adjustments

13. On the spectrum analyzer, press

14. Move the positive DVM test lead to

15. On the spectrum analyzer, press
message to disappear before continuing to the next step.

16. Read the voltage displayed on the DVM. If the voltage is less than $6.06 Vdc, turn

A5T200 XTAL CTR 1 clockwise. If the voltage is greater than i-6.26 Vdc, turn XTAL

CTR 1 counterclockwise.

17. Repeat steps 15 and 16 until the voltage reads

ISPAN),

1, (MHz), and

A5TP7.

AIIJ CVRR

ICAL).

IF STATE. Wait for the IF ADJUST STATUS

t6.16

Vdc

flO0

mV.

Adjustment Procedures 2-23

3. IF

Bandpass

Adjustment

Note

If the range for the XTAL CTR adjustment is insufficient, replace the
appropriate factory-selected capacitor as listed in Table 2-8. To determine

the correct replacement value, center the XTAL CTR adjustment, and press

AD.?

GUM IF STATE. After the IF ADJUST STATUS message disappears, read

the DVM display. Choose a capacitor value from Table 2-9, based on the
DVM reading and the presently loaded capacitor value. Table 2-10 lists a few
capacitor part numbers.

Caution

Turn the spectrum analyzer off by pressing

LLINE)

to the off position before

removing or replacing any shield.

18. Move the positive DVM test lead to

A5TP8.

19. Adjust A5T202 XTAL CTR 2 using the procedure in steps 15 through 17.

20. Move the positive DVM test lead to

A5TP3.

21. Adjust A5T500 XTAL CTR 3 using the procedure in steps 15 through 17.

22. Move the positive DVM test lead to

A5TP4.

23. Adjust A5T502 XTAL CTR 4 using the procedure in steps 15 through 17.

Table 2-8. Factory-Selected XTAL Filter Capacitors

XTAL CTR Adjustment Fixed Factory Select Capacitor

A5T200 XTAL CTR 1
A5T202 XTAL CTR 2
A5T500 XTAL CTR 3
A5T502 XTAL CTR 4

A5C204

A5C216

A5C505

A5C516

Table 2-9. XTAL Factory-Selected Capacitor Selection

DVM Reading (V)

Replace Replace

15

with:

0 to 1.5

to

2.5

1.5

to

3.5

2.5
to

4.5

3.5
to

5.5

4.5

5.5 to 6.5

6.5 to 7.5
to

8.5

7.5

to

9.5

8.5

to

10

9.5

* Indicates a condition that should not exist; suspect broken hardware.

*

27
22
18
18

No change No change No change No change No change No change
No change No change No change No change No change No change

*

*

*

Currently Loaded Capacitor Value (pF)

Replace Replace Replace

with:

22

*
* *

* *
27 27
24 27

18

18

18

18

with:

*

*
27
22

20

15

15

*

Replace

with:

20

*

*
27
24
22

18

15

15

24

with:

*

22
20
20

27

with:

*
*
*
*
*

24
24
24

2-24 Adjustment Procedures

Table 2-10. Capacitor Part Numbers

3. IF

Bandpass

Adjustment

I Capacito;?

~

8.2
10
12

15 18
20

22

24

27

HP Part Number

(pF)

0160-4793
0160-4792
0160-4791
0160-4790

0160-4789
0160-4788
0160-5699

0160-4787

0160-5903

0160-4786

Adjustment Procedures 2-25

4. IF Amplitude Adjustments

The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the
reference 15 dB attenuator adjustment.

Assembly Adjusted

A4 log

amp/Cal

oscillator

A5 IF assembly

Related Performance Tests

IF Gain Uncertainty

Scale Fidelity

Description

This adjustment sets the output amplitude of the A4 log
amplitude of the reference 15 dB attenuator.

The output of the A4 log
the 10.7 MHz IF input on the A5 IF assembly

The effect of this adjustment is visible only after the
complete. ADJ

CURR

amplitude from the A4 log

amp/Cal

oscillator is adjusted so that a -55

(A5J3)

ADJ CURR

IF STATE causes the IF gain adjustment to use the “new” output

amp/Cal

oscillator.

This procedure also sets the attenuator of the reference 15 dB attenuator so that a source
amplitude change of 50 dB combined with a spectrum analyzer reference level change of 50 dB
displays an amplitude difference of 50 dB.

amp/Cal

oscillator and the absolute

dBm

signal applied to

causes a displayed signal of -60

IF STATE sequence is

dBm.

Figure 2-7. IF Amplitude Adjustment Setup

2-26 Adjustment Procedures

----------------------,

:

I

TEST CABLE

SPECTRUM I
ANALYZER

RTF?

\

’

A5 IF BOARD

// El

LoG

n4P

AMP/

’ ’ ‘LLATOR

SK16

4. IF Amplitude Adjustments

Equipment

Frequency synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A

Adapters

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Cables

BNC,122cm(48in)

Test cable

. . . . . . . . . . . . . . . . . . . . . .

J9

J5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

. . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . .

85680-60093

A5 IF A4 LOG AMP/CAL OSC

c707

R445

JIO

(REVISION

Jll

R53l-

(REVIS

CONNEC

J8

ION

TOR

J7

J6

J4

J3

CONNECTOR)

Figure 2-8. IF Amplitude Adjustment Locations

Note

The 15 dB reference attenuator adjustment is preset at the factory and need
not be done if the entire A5 IF assembly is replaced.

Procedure

1. Press
place the spectrum analyzer in the service position as illustrated in Figure 2-7.

luNE)

to turn the spectrum analyzer off. Remove the spectrum analyzer cover and

J5

Jl

fd’J4

sjlle

2. Disconnect W29, violet coax cable, from
the 50 R output of the HP 3335A. Press

A5J3.

Connect the test cable between A5J3 and

m

to turn the spectrum analyzer on.

Adjustment Procedures 2-27

4. IF Amplitude Adjustments

3. Set the spectrum analyzer controls as follows:
Center frequency

Span

.........................................................

Reference level

.............................................

...............................................

Attenuator .......................................................

dB/division
Resolution bandwidth
Videobandwidth

4. On the spectrum analyzer, press

..................................................

..........................................

...............................................

IrV1KR), ICAL),

and IF ADJ ON OFF so OFF is underlined.

5. Set the HP 3335A controls as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55dBm

6. Note the marker value. Ideally it should read -60

7. If the marker reads below -60.1

turn clockwise for every 0.1 dB below -60

dBm,

rotate A4R826 CAL OSC AMPTD one-third

dBm.

dBm

fO.l dB.

If the marker reads above -59.9
rotate A4R826 CAL OSC AMPTD one-third turn counter clockwise for every 0.1
above -60

amplitude will not be seen until ADJ

Note

dBm.

See Figure 2-8 for the location of A4R826. A change in the displayed

CURE II?

STATE is pressed.

If A4R826 has inadequate range, refer to “Inadequate CAL OSC AMPTD

Range” in Chapter 9, “IF Section.”

10.7 MHz
200kHz

-60

dBm

OdB

1

dB/DIV

300 kHz

100 Hz

10.7MHz

dBm,

dB

8. Press

ADJ CURE

IF STATE . After allowing the analyzer time to complete the

adjustments, the displayed amplitude and marker reading should change.

9. Repeat steps 7 and 8 until the marker reads -60

dBm

fO.l dB.

10. Disconnect the test cable from A5J3 and reconnect W29 to A5J3.

A5 Reference Attenuator Adjustment

11. Set the spectrum analyzer reference level to -60

(MKR)

and

MAEEEES

12. Set the HP 3335A

OFF .

(-1

to -60

dBm.

13. Connect a BNC cable between the 50 R output of the HP 3335A and the spectrum
analyzer INPUT

14. On the spectrum analyzer, press

500.
ICAL)

and

step keys to place the peak of the displayed signal 3 dB to 5 dB below the reference level.

15.

Press (PEAK SEARCH) and MARKER DELTA on the spectrum analyzer. Set the spectrum

analyzer reference level to -10

16. Change the HP 3335A

17. Press

LCAL)

on the spectrum analyzer.

[m)

dBm.

to -10

dBm.

If markers are displayed, press

EEF LVL ADJ

dBm.

. Use the front-panel knob or

2-28 Adjustment Procedures

4. IF Amplitude Adjustments

18. Note the AMKR amplitude. Ideally, it should read 50.00 dB fO.l dB.

19. If the AMKR amplitude is less than 49.9
counterclockwise for each 0.1 dB below 50.00 dB. If the AMKR amplitude is greater than

50.1

dB,

rotate A5R343 15 dB

50.00 dB. Do not adjust A5R343 more than five turns before continuing with the next
step.

20. Press

reading.

21. Repeat steps 11 through 20 until the AMKR amplitude reading is 50.00 dB fO.l dB.

ADJ CURR

IF STATE on the spectrum analyzer. Note the AMKR amplitude

ATTEN

dB,

rotate A5R343 15 dB

one-half turn clockwise for each 0.1 dB above

ATTEN

one-half turn

A5 Adjustment Verification

22. On the spectrum analyzer, disconnect W29 from

A5J3 and the 50 R output of the HP 3335A.

23. Set the spectrum analyzer reference level to -10

24. Set the HP 3335A

25. Press

26. The MARKER amplitude should read -10

27. On the spectrum analyzer, reconnect W29 to

[MKR)

and

this range, repeat steps 4 through 21.

follows:

(m)

l4ARKER

NORMAL on the spectrum analyzer.

to -5

dBm.

dBm

A5J3.

Connect the test cable between

dBm.

f0.13 dB. If the reading is outside of

A5J3.

Press

(PRESET)

and set the controls as

Center frequency

Span
Reference level
Resolution bandwidth

28. Connect a BNC cable between the HP 85633 CAL OUTPUT and INPUT

29. On the spectrum analyzer, press

30. Use the knob or step keys to adjust the REF LEVEL CAL setting until the MKR reads

-10.00

31. On the spectrum analyzer, press STORE REF LVL .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

dBm

fO.l dB.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

[MKR) ICAL)

and

REF LVL

ADJ .

dBm

5Os1.

Adjustment Procedures 2-29

5. DC Log Amplifier Adjustments

There are three DC log adjustments; limiter phase, linear fidelity, and log fidelity.

Assembly Adjusted

A4 log

amp/Cal

oscillator

Related Performance Tests

IF Gain Uncertainty
Scale Fidelity

Description

These three adjustment need only be done under the following conditions:
Limiter phase Only if a repair is made to blocks F, G, H, I, or J.
Linear fidelity Only if a repair is made to blocks C, D, F, G, H, I, J, K, 0, IF gain

accuracy, RBW switching, or log fidelity.

Log fidelity Only if a repair is made to blocks D, F, H, K, IF gain accuracy, RBW

switching, or log fidelity.

If multiple adjustments are required they should be done in the following order:

1. Limiter phase

2. Linear fidelity

3. Log fidelity

----------------------,

:

I

I

TEST CABLE

I

SPECTRUM

Figure 2-9. DC Log Adjustment Setup

I

SK16

2-30 Adjustment Procedures

5. DC Log Amplifier Adjustments

Equipment

Frequency synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A

Adapters

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Cables

BNC,122cm(48in)

Test cable

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...85680-60093

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Note

A5 IF

(REVISION

CONNECTOR)

J4

J3'

A4 LOG AMP/CAL OSC

R445

JIO

Jll

R531-

J9

J7
R826

J2

J8
J5

Jl

J4
R544

J3

sjlle

Figure 2-10. DC Log Adjustment Locations

Adjustments should be made with all of the shields on and only after allowing
at least a 20 minute warmup.

A4 Limiter Phase Adjustment

1. Press
and place the spectrum analyzer in the service position as illustrated in Figure 2-9. See
Figure 2-10 for adjustment location.

2. Connect the HP 3335A 50 R output to the spectrum analyzer 50 Q input. Press
turn the spectrum analyzer on.

(LINE]

to turn the spectrum analyzer off. Remove the spectrum analyzer cover

Adjustment Procedures 2-31

ILINE)

to

X

Log Amplifier Adjustments

5.
Set the spectrum analyzer controls as follows:

3.

Center frequency

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O

Reference level . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/DIV

Resolution bandwidth . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

IFADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF

4.

Set up an HP 3335A as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -18dBm

5.

Press (CAL),

?ress [MKR).
Adjust A4R445 for maximum on-screen amplitude. Refer to Figure 2-10 for the location of

6.

44R445.

A4

Linear Fidelity Adjustment

1.

Press (LINE) to turn the spectrum analyzer off. Remove the spectrum analyzer cover
and place the spectrum analyzer in the service position as illustrated in Figure 2-9. See
Figure 2-10 for adjustment location.

2.

Connect the HP 3335A 50 R output to the spectrum analyzer 50 fi input. Press

turn the spectrum analyzer on.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz

dBm

ADJ CURR

IF STATE, wait for the analyzer to complete adjustments, then

IuNE)

to

3.

Press

IF

4.

Set the spectrum analyzer controls as follows:

5.

Set up an HP 3335A as follows:

6.

Press [PEAK SEARCH),
Reduce the HP 3335A input power to -58 dBm.

7.
If the delta marker amplitude reads -40 dB f2 dB, no adjustment is necessary.

8.
If the signal is lower on the screen than expected (delta marker amplitude reads less than

9.

-42dB),

ADJ

If the signal is higher on the screen than expected (delta marker amplitude reads greater

10.

than -38

ADJ

(-1, (m),

AD.7

ON OFF, (OFF).

Center frequency

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Resolution bandwidth
Reference level

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

MAftKER

then adjust A4R544 (see Figure 2-10) f

CURR

IF STATE . Allow sufficient time for the analyzer to complete the adjustment.

dB),

then adjust A4R544 for an even higher level signal and press

CURR

IF STATE. Allow sufficient time for the analyzer to complete the adjustment.

LINEAR, MORE I. of 3 , AMPTD UNITS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

,dBm

,

a,

..5MHz

dBm

dBm

DELTA .

or an even lower level and press (CAL],

ICAL),

2-32 Adjustment Procedures

5. DC Log Amplifier Adjustments

11. Repeat steps 5 through 10.

A4 LOG Fidelity Adjustment

1. Press (LINE) to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
place the spectrum analyzer in the service position as illustrated in Figure 2-9.

See Figure 2-10 for adjustment location.

2. Connect the HP 3335 50 0 output to the spectrum analyzer 50 fl input. Press (LINE) to
turn the spectrum analyzer on.

3.

Press

(-),a,

4. Set the spectrum analyzer controls as follows:

IF

AlI>

ON OFF

(OFF),

AD3

CURR

IF STATE.

Center frequency
Span
Resolution bandwidth
Reference level

5. Set up an HP 3335A as follows:

Frequency
Amplitude

6. ,Press

7. Decrease the HP 3335A power to -26

8. Calculate the error:

9. If the error is less than f0.2 dB, no adjustment is necessary.

10. Set the HP 3335A power to -10

11. Adjust A4R531 (
calculated error is

t1.5 dB.

12. Repeat steps 7 through 11.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

(MKR),

MARKER DELTA on the spectrum analyzer.

Press (CAL),

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10

dBm.

Error = delta marker reading - 16 dB

dBm.

see Figure 2-10) to read two times the error. For example, if the

+0.75 dB,

adjust A4R531 for a delta marker amplitude reading of

ALU CUEE

IF STATE .

dBm

..15MHz

dBm

Adjustment Procedures 2-33

6. Sampling Oscillator Adjustment

Assembly Adjusted

Al5 RF assembly

Related Performance Test

There is no related performance test for this adjustment procedure.

Description

The sampling oscillator tank circuit is adjusted for a tuning voltage of 5.05 Vdc when the
sampling oscillator is set to 297.222 MHz. The voltage monitored is actually the tuning
voltage divided by 4.05. The setting is then checked at other frequencies for the full tuning
range of the sampling oscillator.

SPECTRUM ANALYZER

DIGITAL VOLTMETER

- PC

BOARD
PROP

Figure 2-11. Sampler Adjustment Setup

Equipment

Digital voltmeter . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

DVMtestleads

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 34118A

Procedure

1. Press
the spectrum analyzer cover and fold down the Al5 RF and Al4 frequency control

@

to turn the spectrum analyzer off and disconnect the line power cord. Remove

assemblies. Prop up the Al4 frequency control assembly. Reconnect the line power cord
and press

(LINE]

to turn the spectrum analyzer on.

Connect the equipment as illustrated in

Figure 2-11.

SK17

2-34 Adjustment Procedures

6. Sampling Oscillator Adjustment

2. Press (PRESET) on the spectrum analyzer and set the controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..2126MHz

Span. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

3. Set the HP 3456A controls as follows:

Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC VOLTS

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOV.MANUAL

Sampling Oscillator Adjustment

4. Connect the negative DVM test lead to A15J200 pin 6. Connect the positive DVM lead to

A15J200 pin 13.

5. Adjust A15C210 VCO RANGE for a DVM reading of 5.05 V f0.05 V.

PIN 2 . . . l l . l

PIN 1 n . . .

l

Figure 2-12. TAM Connector Pin Locations

. PIN 16

SP114E

Sampler Match Adjustment

6. Connect the negative DVM test lead to A15J400 pin 6, and the positive DVM test lead to
A15J400 pin 1.

7. Press

(-1

sets the sampling oscillator to 291.667 MHz.

8. Adjust

A15ClOO

9. Record the displayed voltage in Table 2-11 as the displayed voltage for the sampling
oscillator frequency of 291.667 MHz.

10. Press

(-1

center frequency to the frequencies listed in Table 2-11. At each listed frequency, record
the displayed voltage in the table.

11. If the difference between the maximum and minimum voltages is less than 0.50 V, and all
voltage readings are between

12. Locate the center frequency at which the voltage is lowest. Use the keypad to set the

spectrum analyzer to this frequency.

13. Readjust SMPL MATCH to set the displayed voltage to 0.8 fO.l Vdc.

14. Set the spectrum analyzer center frequency to 2302.3 MHz and repeat steps 9 through 13.

15. Move the positive DVM test lead to A15J400 pin 3. Check that the measured voltage is
the negative of the voltage at pin 1, within fO.l Vdc.

and set the spectrum analyzer center frequency to 2302.3 MHz. This

SMPL MATCH to peak the voltage displayed on the DVM.

on the spectrum analyzer.

+.5

and

+2.5

Use the keypad to set the spectrum analyzer

Vdc, proceed to step 15.

16. Disconnect the DVM probes from A15J400.

Adjustment Procedures 2-35

6. Sampling Oscillator Adjustment
Table

2158.3 293.478
295

2196.3

.ooo

2378.3 296.471

2422.3 297.222

2-l

1. Sampling Adjustments

2-36 Adjustment Procedures

7. YTO Adjustment

7. YTO Adjustment

Assembly Adjusted

Al4 frequency control assembly

Related Performance Tests

Frequency Span Accuracy
Frequency Readout Accuracy and Frequency Count Marker Accuracy

Description

The YTO main coil adjustments are made with the phase-lock loops disabled. The YTO

endpoints are adjusted to bring these points within the capture range of the main loop. The

YTO FM coil is adjusted to place the 300 MHz CAL OUTPUT signal at the center vertical

graticule in a 20 MHz span.

SPECTRUM
ANALYZER

ADAPTER

500MHz-

26.5 GH

Figure 2-13. YTO Adjustment Setup

Equipment

Microwave frequency counter

Adapters

Type N (m) to BNC (f)
Type N (f) to APC 3.5 (f) (Option 026

APC 3.5 (f) to APC 3.5 (f)

Cables

BNC,122cm(48in)
SMA,61cm(24in)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8120-1578

. . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5343A Option 001

...........................................

........................................

SMA CABI

Al4

FREO

only).

CONTROL

Al5 RF

........................

SK19

1250-1476
1250-1745

5061-5311

Adjustment Procedures 2-37

7. YTO Adjustment

Procedure

Note

This adjustment cannot be performed if preselected external mixer mode is
selected.

The

SAVELOCK

ON OFF function must be OFF.

YTO Main Coil Adjustments

1.

Press (LINE) to turn the spectrum analyzer off. Remove the spectrum analyzer cover and

fold down the Al5 RF and Al4 frequency control assemblies.

2.

Disconnect the 50 R termination from the first LO OUTPUT. Connect the equipment as
shown in Figure 2-13. Press

3.

Move the jumper on A14J23 from the NORM position (pins 1 and 2 jumpered) to the
TEST position (pins 2 and 3 jumpered). See Figure 2-14 for the location on the Al4

frequency control assemblies.

4.

On the spectrum analyzer, press the following keys:

(m)
(m-,

(SPAN),

EXT NXR PRE UNPR

EXTERNAL

MIXER, LOCK HARMONIC,6 Hz

ZERO SPAN

(FREQUENCY), CENTER

SAVE

SAVE STATE, STATE

07

[@EZEkV),

SAVE

SAVE STATE, STATE 1

07

[RECALL),

35.7493

GHz

RECALL STATE, STATE 0.

luNE)

to turn the spectrum analyzer on.

, (UNPR)

FRE$,18.8893 GHz ,[mSWP)

0

5.

On the HP 5343A, press

Sample rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully counterclockwise

10 Hz-500 MHz/500 MHz-26.5 GHz switch . . . . . . . . . . 500 MHz-26.5 GHz

Adjust A14R93 3.2 GHz for the appropriate frequency counter reading of 3.200 GHz

6.

fl

MHz.

7.

On the spectrum analyzer, press STATE
Adjust A14R42 6.01 GHz for a frequency counter reading of 6.010 GHz &l MHz.

8.

9.

On the spectrum analyzer, press STATE 0 .
Repeat steps 6 through 9 until both of these interacting adjustments meet their

10.
tolerances.

2-36 Adjustment Procedures

[SHIFT)

7 and set the controls as follows:

1

.

Al4

R93

J23

7. YTO Adjustment

R42

R76

Figure 2-14. YTO Adjustment Locations

11. Place the jumper on A14J23 in the NORM position (pins 1 and 2 jumpered).

12. Disconnect the SMA cable from the first LO OUTPUT jack and reconnect the
termination on the first LO OUTPUT.

YTO FM Coil Adjustments

13. On the spectrum analyzer, press

Centerfrequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Span

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...20 MHz

14. Adjust A14R76 FM SPAN

center vertical graticule line.

[PRESET)

and set the controls as follows:

..300MHz

until the 300 MHz CAL OUTPUT SIGNAL is aligned with

500

SP116E

;he

I

Adjustment Procedures 2-39

8. LO Distribution Amplifier Adjustment

Assembly Adjusted

Al4 frequency control assembly

Related Performance Test

First LO OUTPUT Amplitude

Description

The gate bias and SENSE voltages for the A7 switched LO distribution amplifier is adjusted
to the value specified on the label of A7.

MEASURING RECEIVER

MEASURING RECEIVER

\

POWER SENSOR

)R

SPECTRUMSPECTRUM

ANALYZER

DIGITAL VOLTMETER

Figure 2-15. First LO Distribution Amplifier Adjustment Setup

Equipment

DVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

DVMtestleads

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 34118A

SK1 10

2-40 Adjustment Procedures

8. LO Distribution Amplifier Adjustment

Procedure

1. Set the HP 85623 (LINE) switch to off and disconnect the line cord. Remove the cover and
fold down the Al5 RF and Al4 Frequency Control assemblies.

2. Move the jumper on A2J12 from the WR PROT to the WR

ENA

position. The jumper is

on the edge of the A2 board assembly and can be moved without folding the board down.

3. Reconnect the line cord and turn on the spectrum analyzer.

4. Set the HP 85623 controls as follows:
Center frequency

Span

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

5. On the HP 85623, press

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.45 GHz

ICAL),

MORE 1 OF 2, SERVICE CAL DATA, La LEVELS, and

INT LO LEVEL.

6. Use the knob or keypad to enter the value 32. This sets the LO power to a low level.

7. To set the gate bias, connect the positive lead of the DVM to A14J18 pin 15 and the

negative lead to A14J18 pin 6. See Figure 2-16 for a pin location drawing.

PIN 2

. . . . . . . . PIN 16

PIN 1 n l . .

0.0

Figure 2-18. TAM Connector Pin Locations

SP114E

8. On the HP 85623, press La

GA=

LEVEL.

9. Note the Gate Bias voltage printed on the A7 LO distribution amp label. Use the knob
or keypad to change the displayed DAC value so the DVM reading is equal to the label
voltage,

f10 mV.

10. To set the low band sense voltage, connect the positive lead of the DVM to A14J18 pin 13
and the negative lead to A14J18 pin 6.

11. On the HP 85623, press INT LO LEVEL . The message

DRIVE FOR

BAND#

0

will be

displayed.

12. Note the “BO EXT Sense” voltage printed on the A7 LO distribution amp label. Use the
knob or keypad, and press enter, to change the displayed DAC value so the DVM reading
is 6 mV more negative than the label voltage. For example, if the “BO EXT Sense”
voltage is -170

mV,

change the displayed DAC value so the DVM reading is -176 mV.

13. Record the DAC value:
DAC

value for 1.45

GHz

=

14. To set the band 1 sense voltage, set the HP 85623 center frequency to 4.60 GHz.

Adjustment Procedures 2-41

8. LO Distribution Amplifier Adjustment

15. On

16. Note the

17. Record the DAC value:

18. To set the band 2 sense voltage, set the HP 85623 center frequency to 9.46 GHz.

19.

20. Note the “B2 INT Sense” voltage printed on the A7 LO distribution amp label. Use the

21. Set the “Sense EXT” value by pressing EXT

22. Use the knob or keypad to enter the DAC value for 1.45 GHz from the band 0 sense

the HP 85623, press

INT LO LEVEL.

“Bl

INT Sense” voltage printed on the A7 LO distribution amp label. Use the

knob or keypad, and press enter, to change the displayed DAC value so the DVM reading
is 6 mV more negative than the label voltage. For example, if the
is -170

On the HP 85623, press

mV,

change the displayed DAC value so the DVM reading is -176 mV.

INT LO LEVEL.

knob or keypad, and press enter, to change the displayed DAC value so the DVM reading

is 6 mV more negative than the label voltage. For example, if the “B2 INT Sense” voltage
is - 170

voltage adjustment above.

mV,

change the displayed DAC value so the DVM reading is - 176 mV.

LCAL),

MORE

The message

(CAL),

The message

I OF

2, SERVICE CAL DATA, LO LEVELS,

DRIVE FOR

MDRE I

OF 2, SERVICE CAL DATA,

DRIVE FOR

LO

BAND#

1

DAC value for 4.60

BAND#

2

LEVEL .

will be displayed.

“Bl

will be displayed.

and

INT Sense” voltage

GHz =

LO LEVELS, and

23. Save the adjustment values by pressing

24. Move the jumper on A2J12 from WR ENA back to the WR PROT position.

PREtV

MENU, STORE DATA, and YES.

2-42 Adjustment Procedures

9. Frequency Response Adjustment

9. Frequency Response Adjustment

Assembly Adjusted

Al5 RF assembly

Related Performance Tests

Displayed Average Noise Level
Frequency Response

Description

A signal of the same known amplitude is applied to the spectrum analyzer at several different
frequencies. At each frequency, the DAC controlling the flatness compensation amplifiers
is adjusted to place the peak of the displayed signal at the same place on the screen. The

preselector is centered at each frequency before setting the DAC value. There are also

correction points at 2 MHz and 6 MHz, which are outside the synthesized sweeper frequency
range. The DAC values for these two points are set to a fixed offset from the DAC value at

10 MHz. The DAC values are stored in EEROM.

Automated Procedure Available

The frequency response adjustment requires making several measurements at more than

120 different frequencies over the spectrum analyzer frequency range.
takes over two hours to complete. However, an automated procedure, with software, is
provided by HP. The software can allow the adjustment to be performed in less than
20 minutes. The Automated HP 85623 “Front End Cal” adjustment performs this task, and
is described in Chapter 3,

“Frequency Response Adjustment Software.”

‘Ihis

manual procedure

Adjustment Procedures 2-43

9. Frequency Response Adjustment

SYNTHES I

~

SWEEPER

RECE I

A

VEi

ZEO

f

FREQIJE

ISTANDI

RF

OUTPUT

:NCY

\RD

EXT

BNC CABLE

i

REF

ADAPTER

!I

POWER

SPLITTER

ADAPTER

I

Figure 2-17. Frequency Response Adjustment Setup

Equipment

Synthesized sweeper
Measuring receiver
Power sensor

................................

Power sensor ...................................................

Power splitter

Adapters

..................................................

Type N (m) to Type N (m)
Type N (m) to APC 3.5 (m)
Type N (f) to APC 3.5 (m)
Type APC 3.5 (f) to APC 3.5 (f)

Cables

BNC,122cm

APC

3.5,91cm(36in)

(48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

...........................................

..............................................

................

..I

........................................

.......................................

........................................

...................................

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8120-4921

SK112

HP

8340A/B

HP

8902A

HP 8482A
HP 8485A

.HP 11667B

1250-1475
1250-1743
1250-1750

5061-5311

\

2-44 Adjustment Procedures

Procedure

9. Frequency Response Adjustment

Note

1. Connect the equipment as shown in Figure 2-17. Do not connect the HP 8482A power
sensor to the HP 11667B power splitter.

2. Zero and calibrate the HP
out in

3. Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR ENA
position. The jumper is on the edge of the A2 board assembly and can be moved without

folding the board down.

4. Press

Center frequency
Span
Resolution bandwidth
dB/division

5. Press (INSTR PRESET) on the HP

CWfrequency

Powerlevel

6. Set ref level cal DAC to zero. Press

to 0. Press STORE

The YIG-tuned filter/mixer slope and offset adjustment must be correct before
the high band part of the frequency response adjustment can be done.

8902A/HP

dBm)

and connect the power sensor through an adapter to the power splitter.

[PRESET)

on the HP 85623 and set the controls as follows:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 MHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 dB

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lO MHz

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4dBm

REV LVL

.

8482A combination in log mode (power levels read

8340A/B

and set the controls as follows:

m),

REF LVL

ADJ and use the knob to set the value

7.

On the HP 85623, press

(MKRI,

(CAL), MORE i OF 2,

SERVICE

CAL DATA, then

FLATNESS . The current value of the RF Gain DAC should be displayed in the active

function area.

8. Enter the appropriate power sensor calibration factor into the HP 8902A.

9. Set the HP
the HP 85623 display. Adjust the HP
on the HP 8902A.

10. On the HP 85623, adjust the RF gain DAC value using the front-panel knob or keypad
until the marker reads -10
change of approximately 0.01 dB.

11. On the HP 85623, press @) to proceed to the next frequency.

12. Repeat steps 7 through 10 for all low-band frequencies

13. Press m until 10 MHz is displayed in the active function block. Record the RF gain DAC
value at 10 MHz.

8340A/B m

output to the frequency indicated in the active function area of

8340A/B

dBm

fO.10 dB. Each DAC count results in an amplitude

POWER LEVEL for a -10

210

MHz.

10 MHz RF

gain

DAC value

dBm

reading

Adjustment Procedures 2-45

9.

Frequency‘Response

14. Add 67 to the 10 MHz RF gain DAC value and record as the 2 MHz RF gain DAC value.

Adjustment

2 MHz RF

15. Add 62 to the 10 MHz RF gain DAC value and record as the 6 MHz RF gain DAC value.
6

MHz

16. Press

17. Press @) until 6 MHz is displayed in the active function block. Use the DATA keys to

18. Press NEXT

19. Disconnect the HP 8482A and its adapter from the HP 11667B. Connect the HP 8485A

20. Enter the appropriate power sensor calibration factor into the HP 8902A.

21. Set the HP
the HP 85623 display.

22. Adjust the HP

(ID

until 2 MHz is displayed in the active function block. Use the DATA keys to

enter the 2 MHz RF gain DAC value recorded in step 14.

enter the 6 MHz RF gain DAC value recorded in step 15.

BANI)

on the HP 85623.

to the HP 8902A. Zero and calibrate the HP
HP 8485A to the HP 11667B power splitter.

8340A/B Icw)

8340A/B

display.

output to the frequency indicated in the active function area of

POWER LEVEL to place the signal midscreen on the HP 85623

8902A/HP

gain DAC value

RF gain DAC value

8485A combination. Connect the

23. On the HP 85623, press PRESEL AUTO

24. Adjust the HP

25. On the HP 85623, adjust the RF gain DAC value using the knob or keypad until the
marker reads -10

26. On the HP 85623, press m to proceed to the next frequency.

27. Repeat steps 20 through 26 for the remaining frequencies in band 1.

28. On the HP 85623, press NEXT BAND to proceed to band 2.

29. Repeat steps 20 through 26 for the remaining frequencies in band 2.

30.

Press

PFW MENU

31. Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR PROT
position.

8340A/B

dBm

fO.10 dB.

POWER LEVEL f

STORE DATA

,then

CTR.

YES

or a -10

on the HP 85623.

dBm

reading on the HP 8902A.

2-46 Adjustment Procedures

10. Calibrator Amplitude Adjustment

Assembly Adjusted

Al5 RF assembly

Related Performance Test

Calibrator Amplitude and Frequency Accuracy

Description

10. Calibrator Amplitude Adjustment

The CAL OUTPUT amplitude is adjusted for -10.00

dBm

measured directly at the front

panel CAL OUTPUT connector.

Y

Figure 2-18. Calibrator Amplitude Adjustment Setup

Equipment

Measuring receiver
Power sensor

Adapters

Type N (f) to BNC (m) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1477

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8902A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8482A

PC

BOARD
PROP

SK113

Procedure
Note

1. Place the spectrum analyzer in the service position shown in Figure 2-18. Prop the Al4
frequency control board assembly in the service position.

2. Zero and calibrate the HP
power sensor 300 MHz cal factor into the HP 8902A.

3. Connect the HP 8482A through an adapter directly to the spectrum analyzer CAL
OUTPUT connector.

4. Adjust A15R561 CAL AMPTD for a -10.00

The spectrum analyzer should be allowed to warm up for at least 30 minutes
before performing this adjustment.

8902A/HP

8482A combination in log display mode. Enter the

dBm

reading on the HP 8902A display.

Adjustment Procedures 2-47

11. 10 MHz Reference Adjustment-OCXO (Non-Option 103)

Assembly Adjusted

A21 OCXO assembly

Note

Replacement oscillators are factory adjusted after a complete warmup and
after the specified aging rate has been achieved. Thus, readjustment should
typically not be necessary after oscillator replacement and is generally not
recommended.

Related Performance Test

10 MHz Reference Accuracy

Description

The frequency of the internal 10 MHz frequency reference is compared to a known frequency
standard and adjusted for minimum frequency error. This procedure does not adjust the
short-term stability or long-term stability of the A21 10 MHz ovenized crystal oscillator

(OCXO). Stability is determined by the characteristics of the particular oscillator and the
environmental and warmup conditions to which it has been recently exposed. The spectrum
analyzer must be on continuously for at least 24 hours immediately prior to oscillator
adjustment to allow both the temperature and frequency of the oscillator to stabilize.

2-48 Adjustment Procedures

SPECTRUM

ANALYZER

11. 10 MHz Reference Adjustment-OCXO (Non-Option 103)

FREQUENCY

STANDARD

FREQ

ADJ

000000
0000

00

BOTTOM-SIDE VIEW

OF MAIN DECK

-yJo

0

0 0

BNC CABLE

c

0

“0

cl

BNC CABLE

Figure 2-19. 10 MHz Reference Adjustment Setup and Adjustment Location

SK120

Equipment

Frequency counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5334A/B

Frequency standard . . . . . . . . . . . . . . . . . . . . . . . . . HP 5061B Cesium Beam Standard

(or any 10 MHz frequency standard with accuracy

<fl

X

10-l’)

Cable

BNC, 122 cm (2 required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Procedure

Note

1. Connect equipment as shown in Figure 2-19 as follows:
a. Press (LINE) to turn the spectrum analyzer on. After the automatic power-on

adjustment sequence is complete, press

is set to internal.

Failure to allow a 24 hour minimum warmup time for OCXO frequency and
temperature stabilization may result in oscillator misadjustment.

[PRESET)

to ensure that the frequency reference

Adjustment Procedures 2-49

11. 10 MHz Reference Adjustment-OCXO (Non-Option 103)

b. Allow the spectrum analyzer to remain powered on continuously for at least 24 hours

to ensure that the A21 OCXO temperature and frequency stabilize.

Note

If the reference is set to 10 MHz EXT , press 10

MHz INT

. Allow the 24 hour
warmup for the OCXO before continuing. When the 10 MHz reference is set
to 10 MHz EXT , the OCXO is not operating or warmed up.

c. Connect the frequency standard to the frequency counter rear panel

TIMEBASE

IN/OUT connector.

d. Connect a BNC cable between the spectrum analyzer rear panel 10 MHz REF

IN/OUT connector and INPUT A on the frequency counter.

2.

Set the frequency counter controls as follows:

Function/data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FREQ A

Input A:

XlOAttenuator...................................................

OFF

AC................................................. OFF(DC coupled)

50 %Z . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . OFF (1 MR input impedance)

AutoTrigger........................................................

ON

100 kHz filter A . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF

INT/EXT switch (rear panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXT

3.

Select a 1 second gate time on the HP

5334A/B

frequency counter by pressing

(GATE], 1, [TIME).

4.

To offset the displayed frequency by -10.0 MHz, press MATH (SELECT/ENTER),

10,

(CHS/EEX),

6, (SELECT/ENTER), (SELECT/ENTER). The frequency counter should now

(CHX/EEX),

display the difference between the frequency of the INPUT A signal and 10.0 MHz with a
displayed resolution of 0.010 Hz (10 MHz).

Locate the FREQ ADJ control on the spectrum analyzer. This control is accessible

5.
through the center deck of the spectrum analyzer. See Figure 2-19.

Remove the dust-cap screw.

6.
Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO

7.

for a frequency counter reading of 0.00 Hz.

On the HP

8.

[-TIME),

5334A/B

frequency counter, select a lo-second gate time by pressing

10, (GATE). The frequency counter should now display the difference

between the frequency of the INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz

(1

mHz).

Wait at least two gate periods for the frequency counter to stabilize, then adjust the

9.

FREQ ADJ control on A21 OCXO for a stable frequency counter reading of 0.000 Hz

kO.010 Hz.

Replace the dust-cap screw to A21 OCXO.

10.

2-50 Adjustment Procedures

12. 10 MHz Reference Adjustment-TCXO (Option 103)

12. 10 MHz Reference Adjustment-TCXO (Option 103)

Assembly Adjusted

Al5 RF assembly

Related Performance Test

10 MHz Reference Output Accuracy (Option 103)

Description

The frequency counter is connected to the analyzer CAL OUTPUT. The CAL OUTPUT

is locked to the 10 MHz frequency reference which yields better effective resolution. The

temperature-compensated crystal oscillator (TCXO)
reading of 300 MHz.

FREQUENCY

STANDARD

is adjusted for a frequency counter

FREQUENCY COUNTER

Figure 2-20. 10 MHz Reference Adjustment Setup-TCXO

Equipment

Microwave frequency counter

Frequency standard . . . . . . . . . . . . . . . . . . . . . . . . . HP 5061B Cesium Beam Standard

(or any 10 MHz frequency standard with accuracy

Cables

BNC, 122 cm (2 required)

. . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5343A Option 001

<fl

X

10-l’)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

SPllE

Adjustment Procedures 2-51

12. 10 MHz Reference Adjustment-TCXO (Option 103)

Procedure

Note

1. Connect the equipment as shown in Figure 2-20. Prop up the Al4 frequency control
assembly.

2. Set the frequency counter controls as follows:

Sample rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Midrange

50 R-l MR switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

10 Hz-500 MHz/500 MHz-26.5 GHz switch

3. Press

(mCTRL) REllR PANEL.

Note

4. Remove dust cap from A15U302, TCXO. The dust cap is toward the rear of the spectrum
analyzer.

5. Adjust 10 MHz ADJ on A15U302 for a frequency counter reading of 300.000000 MHz

f30

Hz.

Allow the spectrum analyzer to warm up for at least 30 minutes before
performing this adjustment.

0

. . . . . . . . . . . . . . .10 Hz-500 MHz

Verify that the 10 MHz reference is set to 10 MHz INT .

When the 10 MHz reference is set to 10
and warmed up. If the reference is set to 10

10 MHz INT and allow 30 minutes for the TCXO to warm up.

MHz

EXT, the TCXO is not operating

MHz ENT

, set the reference to

6. Replace the

dustcap

on A15U302.

2-52 Adjustment Procedures

13. Demodulator Adjustment

Assembly Adjusted

A4 log amplifier/Cal oscillator assembly

Related Performance Test

There is no related performance test for this adjustment.

Description

13. Demodulator Adjustment

A 5 kHz peak-deviation FM signal is applied to the INPUT

500.

The detected audio is
monitored by an oscilloscope. FM DEMOD is adjusted to peak the response displayed on the
oscilloscope.

DIGITIZING

OSCILLOSCOPE

SIGNAL GENERATOR

A3

OUTPUT

I

ADAPTER

$

ADAPTER

B

Figure 2-2 1. Demodulator Adjustment Setup

Equipment

AM/FM signal generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8640B

Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 54501A

Adapters

Type N (m) to BNC (f) (2 required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Type N (f) to APC 3.5 (f) (Option 026 only) . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedures 2-53

.1250-1745

sj150e

13. Demodulator Adjustment

Cables

BNC,122cm

(48in)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Oscilloscope probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . HP 10432A

Procedure

1. Press (LINE) to turn the spectrum analyzer off. Place the spectrum analyzer in the service
position as illustrated in Figure 2-21.

2. Connect the oscilloscope probe from the oscilloscope channel 1 input to probe A4C723
(the end closest to A4U707) as in Figure 2-22. Press

on. Connect the HP 8640B RF OUTPUT to the spectrum analyzer INPUT

3. Set the HP 8640B controls as follows:

luNE)

to turn the spectrum analyzer

500.

RangeMHz

..................................................

Frequency ................................................

Output level .................................................

RF ...............................................................

.............................................................

AM

FM ............................................................

Modulation frequency
Peak deviation

ScaleFM

..................................................

...................................................

..........................................

61to128

lOO.OOOMHz

-1OdBm

ON

OFF

..IN T

1000 Hz

5kHz

..(k/MHz)

4. Adjust the HP 8640B FM deviation vernier for a full-scale reading on the meter. Set the
FM to off.

5. Set the oscilloscope controls as follows:
Channel1

Channel2
Channel 1

.........................................................

.........................................................

..............................................

50 mV/division

Channel1 ........................................................

Channel1 ...................................................

Time base

.............................................. 1.0 ms/division

..BWli

Trigger .........................................................

Trigger source ........................................................

Trigger level ...................................................

on
off

..a c

m

..aut

..O .O V

o

.

6. On the spectrum analyzer, press

Center frequency ............................................

Span
Reference level
Resolution bandwidth

..........................................................

...............................................

..........................................

7. On the spectrum analyzer press:

PEAK SEARCH ,

(SPAN),

ZERO

(m),

MARKER

SPAN

AWlFM DEMDD

-tCE

, FM DEMDD ON OFF (ON)
[CAL), IF ADJ ON OFF (OFF)

ITRIG),

and SWEEP CONT

SGL

Set the volume control to midrange.

2-54 Adjustment Procedures

(PRESET),

(SGL).

then set the controls as follows:

..lOOMH

.5

MHZ

-10
100 kHz

z

dBm

13. Demodulator Adjustment

8. A 1 kHz sine wave should be observed on the oscilloscope. Rotate the volume knob on the
front panel of the spectrum analyzer until the amplitude of the 1 kHz signal is at about

150 mV (3 divisions on the oscilloscope).

9. Adjust A4C707 FM DEMOD for a maximum peak-to-peak response on the oscilloscope.

10. Press (LINE) to turn the spectrum analyzer off. Disconnect the test cable from A4C723.

CONNECT HERE

SP115E

Figure 2-22. Demodulator Adjustment Locations

Adjustment Procedures 2-55

14. External Mixer Bias Adjustment (Non-Option 327)

Assembly Adjusted

Al5 RF assembly

Related Performance Test

There is no related performance test for this adjustment.

Description

A voltmeter is connected to the spectrum analyzer IF INPUT with the external mixer bias set
to off. The bias is adjusted for a 0 Vdc output.

SPECTRUM

DIGITAL VOLTMETER

Al4

ANALYZER

Al5 RF

SK116

Figure 2-23. External Mixer Bias Adjustment Setup

Equipment

DVM . . . . .

Adapters

Type BNC (f) to SMA (m)

Type BNC (f) to dual banana plug

Cables

BNC,122cm (48in)............................................

,.....................................................

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1200

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251-2816

HP 3456A

HP 10503A

Procedure

1. Press luNE) to turn the spectrum analyzer off, and disconnect the ac power cord. Remove
the spectrum analyzer cover and connect the equipment as illustrated in Figure 2-23. Fold
down the Al5 RF assembly. Reconnect the power cord and set the luNE) switch to on.

2. Set the HP 3456A controls as follows:

Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC VOLTS

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O.lV

Resolution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOOmV

3. On the spectrum analyzer press

(AUXCTRL),

EXTERNAL

MIXER,

BIAS, then

BIAS

4. Adjust A15R926 EXT BIAS ZERO for a DVM reading of 0.000 Vdc f12.5 mV.

2-56 Adjustment Procedures

OFF.

15. External Mixer Amplitude Adjustment (Non-Option 327)

15. External Mixer Amplitude Adjustment (Non-Option 327)

Assembly Adjusted

Al5 RF assembly

Related Performance Test

IF Input Amplitude Accuracy

Description

The slope of the flatness compensation amplifiers is determined. The user-loaded conversion
losses for K-band are recorded and reset to 30 dB. A 310.7 MHz signal is applied to the power
sensor and the power level of the source is adjusted for a -30
applied to the IF INPUT. The flatness compensation amplifiers are then adjusted (via DACs)

to

place the displayed signal at the reference level.

dBm

reading. The signal is then

I;’

11 0::

c)

II

BNC CABLE

SPECTRUM
ANALYZER

MEASUR I NG

RECEIVER

II

ATTENUATOR

sYNTpEEsp:;Eo

FREQUENCY

OUTPUT

I

;

( EJ,$ CABLE 1

Figure 2-24. External Mixer Amplitude Adjustment Setup

I

Adjustment Procedures 2-57

15. External Mixer Amplitude Adjustment (Non-Option 327)

Equipment

Synthesized sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP

Measuring receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8902A

Power sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481D

50 MHz reference attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11708A

(supplied with HP

Adapters

Type N (f) to SMA (f) . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1772

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Type APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5061-5311

Cables

BNC,122cm
SMA,61cm(24in)

(48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

8481D)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8120-1578

8340A/B

Procedure

1.

Press

LuNE)

to turn the spectrum analyzer off and disconnect the power cord. Remove the

spectrum analyzer cover and reconnect the power cord.

2.

Set up the equipment as illustrated in Figure 2-24. Do not connect the SMA cable to the

spectrum analyzer.
Move the WR PROT/WR ENA jumper on the A2 controller assembly to the WR ENA

3.
position. The jumper is on the edge of the A2 board assembly and can be moved without
folding the board down.

4.

Press [LINE) to turn the spectrum analyzer on.

EXT MXR

CNV

5.

Press @ or a to display the conversion loss value for each frequency listed in Table 2-12.
Record any conversion loss reading not equal to 30 dB in Table 2-12 at the appropriate
frequency.

If all conversion loss values equal 30 dB, skip to step 7, otherwise continue to step a.

6.

a. Refer to Table 2-12 and press m or a to select a frequency at which the conversion

loss value does not equal 30 dB.

b. Use the spectrum analyzer front-panel keys to set the conversion loss value to 30 dB.

c. Repeat steps a and b for all frequencies having a conversion loss value other than

30 dB.

Press (INSTR PRESET) on the HP

7.

CWfrequency

Power level . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30

PRE UEFR

LDSS VS FREq

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

, (UNPR),

.

(mCTRL),

8340A/B

EXTERNAL MIXER ,

and set the controls as follows:

On the spectrum analyzer, press

BMPTD

CORRECT , then

310.7MHz

c-1,

dBm

2-58 Adjustment Procedures

15. External Mixer Amplitude Adjustment (Non-Option 327)

Table 2-12. Conversion Loss Data

Frequency (GHz)

Conversion Loss

(dB)

(230

dB)

18

20
22
24
26
27

Connect the HP 8481D to the HP 11708A attenuator already connected to the HP 8902A

8.

RF power connector. Zero and calibrate the HP
mode. Enter the power sensor 50 MHz cal factor into the HP 8902A. Connect the power
sensor, through an adapter, to the SMA cable.

8902A/HP

8481D combination in log

Adjust the HP

9.

-30

dBm

On

10.

11.

12.

13.

14.

15.

the spectrum

then CAL
Wait until the message ADJUSTMENT DONE appears in the active function block and press

EXT
Disconnect the SMA cable from the power-sensor/adapter and connect the cable to the

spectrum analyzer IF INPUT.
Use the spectrum analyzer front-panel knob, step keys, or keypad to change the amplitude

of the displayed signal until the marker reads 0

Press

Place the WR
position.

3RD

MXR

PREV MEHJ

Note

16. Press

(mCTRL),

spectrum analyzer.

8340A/B

f0.05 dB.

analyzer,press

AMP

REF

CAL .

, STORE DATA, and

PROT/

The following steps should only be performed if you need to replace the 30 dB
conversion loss values to those recorded in Table 2-12.

EXTERNAL MIXER,

(POWER LEVEL) until the power displayed on the HP 8902A reads

[CAL),

MORE

I

OF 2, SERVICE CAL DATA,

3FtD

GAIN.

dBm

f0.17 dB.

y%S

on the spectrum analyzer.

WR

ENA

jumper on the A2 controller assembly in the WR PROT

AMPTD CORRECT,

then CNV LOSS VS

FREQ

IF AMP,

on the

17. Press a or a to select frequencies where the conversion loss value was recorded in
Table 2- 12.

18. Use the spectrum analyzer front panel keys to enter the conversion loss values recorded for
the frequency.

Adjustment Procedures 2-59

15. External Mixer Amplitude Adjustment (Non-Option 327)

16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment

Assembly Adjusted

Al4 frequency control assembly

Related Performance Tests

Image, Multiple, and Out-of-Band Responses
Second Harmonic Distortion
Frequency Response

Description

The slope and offset of the A10 RYTHM tuning voltage are set by DACs on the Al4

frequency control assembly. The offset DAC value is optimized at a low frequency and the

slope DAC value is optimized at a high frequency.

Automated Procedure Available

The YIG-Tuned Filter/Mixer adjustment is included in the automated HP 85623 “Front
End Cal” adjustment, which is described in Chapter 3,
Software.”

“Frequency Response Adjustment

BNC CABLE

‘EX

ADAPTER

OUTPUT

Al4 FREP CONTROL

Al5 RF

Figure 2-25. RYTHM Adjustment Setup

Equipment

Synthesized sweeper

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP

Adapters

Type N (m) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1744

Type APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5061-5311

8340A/B

H

‘R PROT

JUMPE

THIS

II

J

/WR ENA

:R IN

AREA

Sk121

Cables
APC 3.5, 91 cm (36 in)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8120-4921

2-60 Adjustment Procedures