Keysight (Agilent) 83751A Service Guide

Download

Service Guide

83751A/B

and HP 83752A/8

Synthesized Sweepers

SERIAL NUMBERS

This manual applies directly to instruments with serial prefix 3610A and below.

HP Part No. 83750-90003

Printed in USA March 1996

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. This manual applies to firmware revision 2.0 and above. For firmware revisions below 2.0

contact your nearest Hewlett-Packard service center for a firmware upgrade.

Copyright Hewlett-Packard Company 1993, 1994, 1995, 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 Safety and Regulatory Information chapter in the HP

Synthesized

Sweepers

User’s Guide

contains regulatory information.

83751A/B

and HP

83752A/B

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.

Assistance

““.

Product maintenance agreements and other customer assistance agreements are Hewlett-Packard products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service

O&e.

availabEe

for

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

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.

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

warning

note until the indicated conditions are fully

Instruction The instruction

Manual necessary for the user to refer to the instructions in the manual.

manual

symbol. The product is marked with this symbol when it is

Table O-l. Hewlett-Packard Sales and Service Offices

Headquarters California, Northern

lewlett-Packard 19320 Pruneridge Cupertino,

1800)

752-0900

Colorado

Hewlett-Packard 24

Inverness Place, East

Snglewood,

1303)

649-5512

New Jersey

Hewlett-Packard Co. 150 Green Pond Rd. Rockaway, NJ 07866 (201) 586-5400

Headquarters France Germany Hewlett-Packard S.A. Hewlett-Packard France Hewlett-Packard GmbH 150, Route du Nant-d’Avri1 1 Avenue Du Canada 1217 Meyrin

Switzerland (41 22) 780.8111 France (49 6172) 16-O

Great Britain Hewlett-Packard Ltd.

Eskdale Road, Winnersh Triangle

Wokingham, Berkshire RG41 5DZ

England (44 734) 696622

Co.

Avenue

CA 95014

Co.

CO 80112

2/Geneva

Hewlett-Packard Co. 301 E. Evelyn Mountain View, CA 94041

(415) 694-2000

Georgia Hewlett-Packard Co. 2000 South Park Place Atlanta, GA 30339

(404) 955-1500

Texas Hewlett-Packard Co. 930 E. Campbell Rd.

Richardson, TX 75081 (214) 231-6101

EUROPEAN FIELD OPERATIONS

Zone D’Activite De Courtaboeuf 61352 Bad Homburg v.d.H F-91947 Les

(33 1) 69 82 60 60

Ulis Cedex Germany

California, Southern

Hewlett-Packard Co.

1421 South Manhattan Ave. Fullerton, CA 92631

(714) 999-6700

Illinois Hewlett-Packard Co. 5201 Tollview Drive Rolling Meadows, IL 60008 (708) 255-9800

Hewlett-Packard Strasse

INTERCON

Headquarters

Hewlett-Packard Company

3495 Deer Creek Road

Palo Alto, California, USA

34304-1316

(415) 857-5027

China Japan

China Hewlett-Packard Company Hewlett-Packard Japan, Ltd.

Bei

San Huan Xl Road 1-27-15 Yabe, Shuang Yu Shu

Hai

Dian District (81 427) 59-1311 Beijing, China (86 1) 256-6888

Taiwan Hewlett-Packard Taiwan

8th Floor, H-P Building 337 Fu Hsing North Road Taipei, Taiwan

(886 2) 712-0404

Australia Hewlett-Packard Australia Ltd. 31-41 Joseph Street Blackburn, Victoria 3130

(61 3) 895-2895

Kanagawa 229, Japan

FIELD OPERATIONS

Canada Hewlett-Packard (Canada) Ltd. 17500 South Service Road

Tram+Canada Highway

Kirkland, Quebec H9J Canada

(514) 697-4232

Singapore

Hewlett-Packard Singapore (Pte.) Ltd.

Sagamihara

150 Beach Road #29-00 Gateway West Singapore 0718 (65) 291-9088

2X8

General Safety Considerations

WARNING

These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so.

The power cord is connected to internal capacitors that may remain live for 5

seconds after disconnecting the plug from its power supply.

This is a Safety Class 1 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 of the instrument is likely to make the instrument dangerous. Intentional interruption is prohibited.

The detachable power cord is the instrument disconnecting device. It

disconnects the mains circuits from the mains supply before other parts of the instrument. The front panel switch is only a standby switch and is not a LINE switch.

For continued protection against fire hazard, replace line fuse only with same type and rating (type F 6.3A 250V). The use of other fuses or materials is prohibited.

The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the product from all voltage sources while it is being opened.

How to Use This Guide

This guide uses the following conventions:

(FRONT-PANEL

SHIFT

KEY

BUMCTICIN

D 1 !sF'LA"(

ANNUNCIATOR

This represents a key physically located on the instrument. This represents a shift function (blue text above front panel keys).

Text in this font represents the FREQUENCY,

MARKER/SWEEP/ST,4TUS,

and POWER displays.

Text in this font represents the annunciators that are displayed in the lower portion of the synthesized sweeper display.

Documentation Description

This guide contains the information required to calibrate and repair the synthesized sweeper

to the assembly level. Included are the following:

n performance tests to test the instrument to specifications

adjustments required after repair or performance test failure

automated performance tests and adjustments

disassembly procedures for removal and replacement of assemblies

troubleshooting procedures to identify failed assemblies

replaceable part numbers

calibration constant descriptions and procedures

service-related special menu descriptions

instrument history to backdate the manual to older instrument versions

tables of post-repair information and recommended equipment required

vii

Contents

1. Performance Tests

Internal Timebase: Aging Rate (Option C W Frequency Accuracy Swept Frequency Accuracy Power Accuracy Power Flatness

Maximum Leveled Power Spurious Signals (Harmonics) Spurious Signals (Non-Harmonics) Residual FM

Automated performance tests

2. Adjustments

10 MHz Standard (Option

100 MHz VCXO Sweep Generator

V/GHz

ADC DYO and SAF Adjustments DYO Linearity DYO Gain and Offset

SAF Sense DYO Delay

SAF Tracking

ALC Detector and Logger (HP

ALC Modulator Offset and Gain

Scalar Pulse Symmetry

Power Flatness

Downloading Firmware

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

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

lE5

only)

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

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

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

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

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

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

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

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

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

lE5

Only)

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

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

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

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

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

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

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

83751A/2A 83751B/2B

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

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

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

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

Only)

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

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

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

l-3 l-6

l-8 1-12 1-14 1-16

1-19 l-22 l-26 l-28

2-2

2-6

2-8 2-13

2-17

2-19 2-20 2-21 2-24 2-28 2-45 2-54 2-57 2-60 2-64

2-66 2-69

3. Automated Tests

What you’ll find in this chapter

Required test equipment

Computer keyboard compatibility and mouse operation

Using an HP 46021A keyboard with a Series 300 computer Using an HP 98203C keyboard with a Series 200 or 300 computer Using a mouse with a Series 300 computer

Step 1. Set up the hardware for automated testing

Loading BASIC and BIN files

Step 2. Install the HP 83750 Series Service Support Software on an SRM or

HFS hard disk

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

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

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

..........

........

.....

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

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

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

3-l 3-2 3-2

3-2 3-3 3-3 3-4 3-4

3-5

Contents-l

Optional: Run the service support software from flexible disks

Step 3. Load the

Leaving the

Step 4. Enter information about your synthesized sweeper

Changing the default HP-IB address for the UUT

Entering the option of the UUT ...................

Changing the temperature setting

Changing the humidity setting Selecting the line frequency

Step 5. Select where you want to direct the test results

Sending graphics to the printer

Step 6. Verify the test equipment ....................

Changing the default test equipment and addresses by editing Step 7. Verify the accessories

Step 8. Run the automated tests ....................

If a measurement fails

Quitting the

What the tests do ...........................

Initial Setup

Calibrate FRAC-N VCO

Power Clamp Cal

Atten

Verification ..........................

Atten

Flatness Adj (Option

Get Cal Constants

HP8375x

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

A/B Performance Test Program

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

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

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

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

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

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

A/B Performance Test Program

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

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

1El

only)

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

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

..........

.........

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

..........

.........

......

........

TSCRIPT

. .

3-6 3-8 3-8

3-9

3-10 3-11

3-11 3-12 3-13 3-13

3-14

3-17 3-18 3-19 3-19 3-20 3-20 3-20 3-20 3-20 3-20 3-21

4. Disassembly Procedures

Fuse Disassembly

Disassembly

Top Cover Disassembly and Reassembly

Disassembly

Reassembly

Bottom Cover Disassembly and Reassembly

Disassembly

Reassembly

Side Cover Disassembly and Reassembly

Disassembly

Removing the right side cover Removing the left side cover

Reassembly

Replacing the right side cover

Replacing the left side cover ....................

Portable Cover Disassembly and Reassembly (Option AX5)

Disassembly Reassembly

Card Cage Cover Disassembly and Reassembly

Disassembly Reassembly

Fan Cover Disassembly and Reassembly

Disassembly Reassembly

Fan Disassembly and Reassembly

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

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

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

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

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

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

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

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

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........

4-4 4-4 4-5 4-5 4-5 4-6

4-6 4-6 4-7

4-7 4-7

4-7

4-8

4-9

4-10 4-10 4-11 4-12 4-12 4-12

4-13

Contents-2

Disassembly Reassembly

Front Panel Disassembly and Reassembly

Disassembly Reassembly

Front Panel PC Board Disassembly and Reassembly

Disassembly Replacing the front panel PC board

Rear Panel Disassembly and Reassembly

Disassembly Reassembly

Rear Panel PC Board Disassembly and Reassembly

Disassembly Reassembly

Power Supply Disassembly and Reassembly

Disassembly Reassembly

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

..........

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

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

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

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

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

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

......

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

.........

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

10 MHz Standard Disassembly and Reassembly (Option

Disassembly Reassembly

RF Deck Disassembly and Reassembly

Disassembly

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

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

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

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

Removing an RF deck with front panel output ......

Removing an RF deck with rear panel output (Option

Reassembly

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

Replacing an RF deck with front panel output ......

Replacing an RF Deck with rear panel output (Option Reconnecting cables and assemblies

RF Deck Semi-Rigid Cable Disassembly

Disassembly

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

RF Deck Semi-Rigid Cable Reassembly

Reassembly

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

Motherboard Disassembly and Reassembly

Disassembly

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

Removing the major assemblies

...........

..........

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

Removing the cables and PC boards ...........

Detaching the motherboard

Reassembly

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

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

Positioning the motherboard on the instrument assembly Securing the motherboard to the instrument assembly

Replacing the cables and PC boards ...........

Replacing the major assemblies

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

lE5)

lE4)

. .

...

......

4-13 4-15 4-16

4-16 4-19 4-20 4-20 4-20 4-21 4-21 4-22 4-25 4-25 4-25

4-27 4-27 4-28 4-30 4-30 4-30 4-32 4-32 4-34 4-34 4-35 4-35 4-35 4-36 4-37 4-37

4-38 4-38 4-39 4-39 4-39 4-39 4-41 4-43 4-43

4-44 4-46 4-48

Contents-3

5. Troubleshooting

Shipping Your Instrument Back to HP

5a.

Instrument Level Troubleshooting

How to Use Instrument Level Troubleshooting

ILT-1. Power Supply Will Not Power On

Failure Symptoms Perform These Power Supply LED Checks Does the Fan Operate?

ILT-2. Power Supply Shuts Down during Operation

Failure Symptoms Over-Temperature Shutdown Troubleshooting

ILT-3. CPU Power On Self-Test Fails

Failure Symptoms CPU

LEDs

Cycle On/Off

Run the CPU Self-Tests

Observe the CPU Idle Loop

ILT-4. A10 Sweep Generator DSP Check Fails

Failure Symptoms

5b. Assembly Level Troubleshooting

Al/A2 Front Panel Keyboard and Processor Troubleshooting

Al-l. Measure the Front Panel Power Supplies Al-2. Perform the Front Panel Self-Tests (Keyboard Operational) Al-3. Perform the Front Panel Self-Tests (Keyboard Not Functional) Al-4. Run the Front Panel Keyboard Self-Test

A2-5.

Run the Front Panel LED Annunciator Test

Al-50. Replace the Al Front Panel Keyboard

A2-50.

A3 Power Supply

A3-1. A3-2.

A3-3. A3-4. A3-5. A3-6. A3-7. A3-50.

A4CPU

A4-1. A4-2. A4-3. A4-50.

A5Timer

A5-1. A5-2. A5-3. A5-4. A5-5.

Replace the A2 Front Panel Processor

Rear Panel Power Supply LED Troubleshooting

Check the Line Fuse To Remove a Fuse To Replace a Blown Fuse

Check the Bridge Rectifier LED

Check the Standby/Power On Control Logic Isolate the Power Supply Isolate to a PC Board Verify the Fan Voltage

Replace the A3 Power Supply

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

Check the Instrument Buss

Upgrade the Firmware Isolate to a PC Board

Replace the A4 CPU

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

Check the Power Supply Voltages Check the L INT FN UNLOCK Input Check the HSWP Output Check 1 MHz at Check the L

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

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

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

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

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

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

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

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

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

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

A5TP8

ADC-TRIG

Output

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

...........

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

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

........

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

....

...

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

...........

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

..........

...........

5-1

5a5a-4 5a-4 5a-4 5a-4 5a-5 5a-5 5a-5

5a-6

5a-6 5a-7 5a-9 5a-9

5b-3 5b-3 5b-3 5b-5 5b-6 5b-7 5b-8 5b-9

5b-13 5b-14 5b- 14 5b-14 5b-15 5b-15 5b-15 5b-16

5b-17 5b-17 5b-18 5b-21

5b-22 5b-23 5b-23 5b-24 5b-27 5b-29 5b-29 5b-30 5b-30 5b-30

Contents-4

A5-6.

Check the L DAC-TRIG Output

A5-7.

Check the L INT UNLEVEL Input (Leveled)

A5-8.

Check the LMTRG Output ...................

A5-9.

Check the L SWP-TRIG Output ................

A5-10.

Check the Marker Input ....................

A5-11. A5-12. A5-13. A5-14. A5-15. A5-16. A5-17. A5-18. A5-19. A5-20. A5-21.

A6 Reference

A7 Fractional-N

A8YOLoop.

A9ALC..

Check the LMKR Output Check the PULSE-GEN Output Check PZAB Output (marker) Check PZAB Output Check PZAB Output (sweep) Check the LQSS I/O Check the L INT REF UNLOCK Input

Check the LRTC I/O

Check the SSRQ I/O Check the L INT SG Input

Check the L INT UNLEVEL Input (Unleveled) .........

A5-22. A5-50.

A6-1. A6-2. A6-3. A6-4. A6-5. A6-50.

A7-1. A7-2. A7-3. A7-50.

Check the L INT YO UNLOCK Input .............

Replace the A5 Timer

Check the Power Supply Voltages

Check the 10 MHz Oven Standard Input .............

Check 1 MHz-BKT Output Check 1 Check the Sync Output

Replace the A6 Reference ...................

Check the Power Supply Voltages

Check the FN REF Input ...................

Check the HSWP Input

Replace the A7 Fractional-N

A8-1.

Check the Power Supply Voltages

A8-2.

Check the FM Input

A8-3.

Check the Sampler IF Input ..................

A8-4.

Check the YO LO FM Input

A8-5.

Check the 1 MHz Input

A8-50.

A9-1. A9-2. A9-3. A9-4. A9-5. A9-6. A9-7. A9-8. A9-9. A9-10. A9-11.

Replace the A8 YO Loop

Check the Power Supply Voltages Check the PWR-LVL Input

Check the S/H TRIG Input ..................

Check the Internal Detector Input Check the Internal Detector Input Check the Check the Pulse Generator Input Check the Hi Pulse Mod Output Check the Hi Pulse Mod Output

Check the Low Pulse Mod Output

A9-12. A9-13.

Check the Hi-MOD Output ..................

Check the TC REF Output ..................

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

...........

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

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

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

(PZABretrace)

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

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

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

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

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

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

MHz-Y0

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

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

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

Het-MOD

Output

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

Output ..................

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

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

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

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

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

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

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

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

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

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

(HetBdDetIn)

(LowBdDetIn

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

(HiPulseOff) (HiPulseOn)

(HETPulseOff) (HETPulseOn)

.........

and

HiBdDetIn)

..........

........

. .

5b-31 5b-31 5b-32 5b-32 5b-33 5b-33

5b-34 513-34 513-35 513-35 5b-36 5b-37 5b-37 513-38 5b-38 5b-39 513-39 5b-40 5b-43 5b-44 5b-44 513-45 58-45 5b-45

513-46 513-49 5b-50 5b-50 5b-50 5b-52 513-55 513-56 5b-56 513-56 5b-57 5b-57

513-58

5b-61

5b-63 5b-63 5b-63 5b-64 5b-65 5b-67 513-67 5b-68

5b-68 5b-68 5b-69 510-69 5b-70

Contents-5

A9-50.

A10 Sweep Generator

AlO-1. AlO-2. AlO-3.

AlO-4. AlO-5. AlO-6. AlO-7.

A10-8. Check the

AlO-9. AlO-10. AlO-50.

All YIG Driver

All-l. Check the Power Supply Voltages All-2. Check the All-3. Check the Oscillator Current Driver Output

All-4. Check the SAF Current Driver Outputs All-5. Check the -0.6 All-6. Check the SWP-OUT Input

All-50. Replace the All YIG Driver

Al2 RF Interface

A12-1. A12-2. A12-3. A12-4. A12-5. A12-6. A12-7. A12-8. A12-9. ,412-50. A12-51.

Al3 Rear Panel

A13-1. A13-50.

Al4 Motherboard

A14-50.

The Instrument Is Unlocked

801 802

803 804

The Instrument Is Unleveled

Low or No RF Output Power

High RF Output Power

Replace the A9 ALC

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

Check the Power Supply Voltages Check the

Check the Check the PSWP Output Check the Check the Check the TC REF Input

Check the

Check the SWP-OUT Output Replace the A10 Sweep Generator

Troubleshoot the Power Supply Check DYO Sense

Check IF Amp Sense

Check Mixer Sense Check Mixer Volts Check Mod Amp Bias Voltage

Check the -40V Output

Check the

Check SAFD Sense

Replace the Al2 RF Interface Replace the RF Deck Assemblies

Check for Rear Panel Connections

Replace the Al3 Rear Panel

Replace the Al4 Motherboard

YIGOsc REFOsc FracN HetBnd

Low or No RF Output Power, 0.01 to 20 Low or No RF Output Power, 0.01 to 2

Low or No RF Output Power, 2 to 11

High Bands)

High RF Output Power, 0.01 to 20

Unlck

Unlock

Unlck

LDAC-TRIG

DYOXORR

PSWP-FB PWR-CLMP

PWR-LVL SAF-CORR

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

YO-LO-FM

V/GHz

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

+5VA

Output

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

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

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

Unlck

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

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

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

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

Input

Output

Input

Output

Input

Output

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

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

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

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

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

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

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

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

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

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

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

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

GHz

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

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

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

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

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

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

GHz (AI1

GHz

and 11 to 20

(All Bands)

...........

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

Bands)

(Heterodyne Band)

.......

....

GHz

(Low and

.........

5b-71 5b-75 5b-77 5b-77

5b-78 5b-78 5b-78 513-79 5b-79 5b-79 5b-79 5b-80 5b-81 5b-85 5b-86 5b-86

513-87 513-88 510-88

5b-89

5b-90 5b-93 5b-94 513-95 5b-95 5b-96 5b-96 5b-97 5b-97 5b-98 5b-98

5b-99 5b- 100 5b-107 5b-107 5b-108 5b-111 5b-111 5b-113 5b-113 5b-113 5b-114 5b-114 5b-115 5b-116 5b-116 5b-120

5b-123

5b-126

513-126

Contents-6

“-

High RF Output Power, 2 to 20 High RF Output Power, 0.01 to 2

GHz

(Low and High Band)

GHz

(Heterodyne Band) .......

Instructions for Troubleshooting When Adjustments Don’t Work Instructions for Troubleshooting Performance Test Failures

5c.

Overall Block Diagrams

6. Replaceable Parts

Module-Exchange Program Replacement Information Ordering Information

How To Order Parts ...

7. Calibration Constants

What are calibration constants? Memory areas

Working data Protected data Default data

Integrity verification

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

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

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

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

Working with calibration constants

Changing working data calibration constants Saving working data calibration constants Loading protected data calibration constants

Loading default data calibration constants Calibration constant information Calibration arrays

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

YIG oscillator correction array YIG filter correction array Internal ALC array

Unleveled ALC array

Attenuator power flatness array

Power clamp array Fractional-N array

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

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

Fast!

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

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

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

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

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.........

......

5b-128 5b- 129 5b- 130 5b- 132

6-l

6-2 6-2

7-2 7-2 7-2 7-2 7-2 7-3

7-5 7-5 7-5 7-6 7-6

7-6 7-12 7-12 7-12 7-12 7-12 7-12 7-13 7-13

8. Service-Related Special Menus

21 FULL SELFTST

To See the Results of the Full Self-Test To Run the Full Self-Test

22 *SERVICE

100 SELF TESTS : : : : : : : :

Help Text

101 VIEW PATCHES

Entering a Entering a NEWLIMITS Patch Deleting a Patch

102 LOOP ON/OFF

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

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

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

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

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

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

SKIPTEST

Patch

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

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

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

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

23 *CALIBRATION .........................

22 *DIAGNOSTICS

309 NEW FIRMWARE 311 ADJUSTMENTS

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

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

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

8-3

8-3 8-4 8-5

8-5 8-12 8-12 8-13 8-13 8-14 8-15 8-16 8-16

8-16

Contents-7

312 NEW PASSWORD

Entering the Password

In Case of Difficulty

Changing the Password

What to Do in Case of Difficulty

Disabling the Password

9. Instrument History

ChangeA

A9 ALC Assembly . . . . . . . . . . . . . . . . . . . . . . . . .

10. Quick Reference Index

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

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

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

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

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

8-16 8-16

S-16

8-17 8-17 8-17

9-3 9-3

Contents-8

Figures

l-l. Internal Timebase: Aging Rate Test Setup ...............

l-2. CW Frequency Accuracy Test Setup ..................

l-3. Swept Frequency Accuracy Test Setup

l-4. Video Signal on the Oscilloscope ...................

l-5. Power Accuracy Test Setup .....................

l-6. Power Flatness Test Setup

l-7. Maximum Leveled Power Test Setup .................

l-8. Location of UNLEV Message .....................

l-9. Spurious Signals (Harmonics) Test Setup ................

l-10. Spurious Signals (Non-Harmonics) Test Setup l-11. Residual FM Test Setup

2-l. 10 MHz Standard Adjustment Setup .................

2-2. 10 MHz Standard Adjustment Location ................

2-3. Accuracy versus Adjustment Interval

2-4. 100 MHz VCXO Adjustment Setup ..................

2-5. Sweep Generator Adjustment Setup

2-6.

AlOR

2-7. Fast Sweep Rate Adjustment Setup ..................

2-8.

V/GHz

2-9.

V/GHz

2-10. ADC Adjustment Setup .......................

2-11. DYO Gain and Offset Adjustment Setup ................

2-12. Example of Adjusted End Points ...................

2-13. SAF Sense Adjustment Setup .....................

2-14. Fast Sweep Verification Waveforms

2-15. DYO Offset and Gain Adjustment Setup ................

2-16. Break Point Locations ........................

2-17. Example of Properly Adjusted A and B Terms 2-18. High Band Narrow Sweep Adjustment

2-19. Example of Factory Adjustment ...................

2-20. Start of Sweep DYO Adjustment Setup 2-2 2-22. Skipped Cycles after Adjustment 2-23. Example of Waveform Showing 18

2-24. SAF Tracking Adjustment Setup ...................

2-25. Low Power Points during Slow Sweep 2-26. Low Power Points during Fast Sweep

2-27. 18 2-28. 18 2-29. Completed

2-30. ALC Detector and Logger Adjustment Setup ..............

2-31. ALC Detector and Logger Adjustment Setup ..............

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

and

AlOR

Adjustment Setup Using the Oscilloscope

Adjustment Setup Using the DVM

GHz

Tail Before

GHz

Tail after

YFDS2HIg

Adjustment Locations ..............

YFDS15HI

YFSD15HI

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

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

Adjustment

Adjustment ..................

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

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

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

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

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

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

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

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

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

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

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

GHz

Tail ..............

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

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

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

l-4 l-6

l-8 l-10 1-12 1-14 1-16

1-17 1-19 l-22 l-26

2-2

2-4

2-5

2-6

2-8

2-9 2-10

2-13 2-14 2-17 2-21 2-23 2-24

2-26 2-28 2-32 2-33 2-35 2-35 2-36 2-38 2-39 2-42 2-45 2-49 2-49 2-52 2-52 2-53

2-54 2-57

Contents-9

2-32. ALC Modulator Gain and Offset Adjustment Setup

2-33. 2-34. 2-35. 2-36. 2-37.

A and B Adjustments for Offset and Gain

Scalar Pulse Symmetry Adjustment Setup Power Sensor Calibration Setup Power Flatness Adjustment Setup

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

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

Downloading Firmware Equipment Setup

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

...........

4-l. HP 83750 Overview .........................

4-2.

Fuse Removal

4-3.

Portable Cover

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

4-4. Card Cage Cover Removal ......................

4-5. Fan Cover Removal .........................

4-6. Dislodging the Fan .........................

4-7. Front Edge Trim Strip

4-8. Connection Locations on Card Cage Boards and Motherboard

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

......

4-9. Front Cable Locations ........................

4-10. Rear Panel 4-l 1. Rear Panel Cables 4-12. Connection Locations on Card Cage Boards and Motherboard

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

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

......

4-13. Rear Panel .............................

4-14. Instrument Side Rails ........................

4-15. 10 MHz Standard Mounting Orientation 4-16. Screw and Cable Locations for RF Deck 4-17. Connection Locations on Card Cage Boards and Motherboard

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

......

4-18. Removing the RF deck .......................

4-19. Semi-Rigid Cable Locations for RF Deck

4-20.

4-21.

Connection Locations on Card Cage Boards and Motherboard

FETs

on Motherboard ........................

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

......

4-22. Rivscrew Locations on Motherboard ..................

4-23. 4-24. 4-25.

5b-1. 5b-2. 5b-3. 5b-4. 5b-5. 5b-6. 5b-7. 5b-8.

TORX Screw Locations on Motherboard

FETs

on Motherboard

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

Connection Locations on Card Cage Boards and Motherboard

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

......

Display Test Part One ........................

Display Test Part Two

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

Display Test Part Three .......................

Front Panel Key Alphanumeric Identification

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

Fuse Removal ...........................

PZAB Waveform at

A5TP4

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

Location of the Measured Value and the Minimum and Maximum Values Location of the Measured Value and the Minimum and Maximum Values

6-l. Module Exchange Program ......................

6-2.

Major Assemblies

6-3.

Cables.

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

6-4. Front-Panel Assembly

6-5.

Rear-Panel Assembly

6-6.

FET Assembly

6-7.

Oven Oscillator Assembly (Option

6-8.

Top View, Attaching Hardware

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

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

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

lE5)

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

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

6-9. Bottom View, Attaching Hardware ..................

6-10. Left Side View, Attaching Hardware ..................

6-11. Right Side View, Attaching Hardware .................

6-12. RF Connector and Hardware .....................

. .

2-60 2-62 2-64 2-66 2-67

2-69

4-3 4-4

4-9 4-10 4-12 4-14 4-16 4-18

4-20

4-21

4-22 4-23 4-26 4-28

4-31

4-32 4-33 4-35 4-37 4-40

4-41

4-43 4-45 4-46 4-48

5b-4 5b-4 5b-5 5b-6

5b- 14

5b-34 5b-64 513-66

6-4 6-5

6-10

6-20 6-23 6-25 6-26 6-27 6-28

6-29

6-30

6-31

Contents-10

6-13. Chassis Parts ............................

6-14. Portable Chassis ..........................

7-l. Integrity Verification Flowchart ....................

8-l. The Instrument Group .......................

8-2. Example of a Self-Test at the Primitive Level ..............

8-3. Example of a Self-Test Patch .....................

6-35

6-38

7-4

8-l

8-5

8-12

Contents-l 1

Tables

O-l. Hewlett-Packard Sales and Service Offices

l-l. Swept Frequency Accuracy Instrument Settings

l-2. Power Accuracy Frequencies .....................

l-3. Frequency Ranges

l-4. Low Band Mixer Spurs

l-5. Fixed Offset Spurs .........................

l-6. Test Record for HP 83751A (1 of 4) ..................

l-7. Test Record for HP 83752A (1 of 4) 1-8. Test

l-9. Test Record for HP 83752B (1 of 4) 2-l. DYO Calibration Constant Default Values

2-2. SAF Calibration Constant Default Values ...............

2-3. Calibration Constant Starting Values 2-4. Calibration Constant Starting Values

3-l. Required Test Equipment ......................

3-2. Required Accessories ........................

3-3. Required Bin Files .........................

3-4. Test Equipment Variable Names

5a-1.

Failure Messages and Related Troubleshooting

5a-2.

Power Supply

5a-3.

LED Power On Sequence ......................

5a-4.

Measurements On the A4 CPU Assembly

5b-1.

CPU Error Codes and Related Signals

5b-2.

Power Supply Voltages Input to A5 Timer ...............

5b-3.

Power Supply Voltages Input to A6 Reference

5b-4.

Power Supply Voltages Input to A7 Fractional-N

5b-5.

Power Supply Voltages Input to A8 YO Loop

5b-6.

Power Supply Voltages Input to A9 ALC ...............

5b-7.

Power Supply Voltages Input to A10 Sweep Generator

5b-8.

Power Supply Voltages Input to All YIG Driver

5b-9.

Power Supply Test Points on Al2

5b-10.

Troubleshooting Help for Failed Adjustments

5b-11.

Troubleshooting Help for Failed Performance Tests

1. Reference Designations and Abbreviations

6-2. Major Assemblies ..........................

6-3. Cables. ..............................

6-4. Front-Panel Assembly ........................

6-5. Rear-Panel Assembly ........................

6-6. FET Assembly ...........................

6-7. Oven Oscillator Assembly (Option

6-8. Top View, Attaching Hardware ....................

6-9. Bottom View, Attaching Hardware ..................

6-10. Left Side View, Attaching Hardware

RecordforHP

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

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

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

LEDs

83751B

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

(lof4)

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

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

lE5)

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

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

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

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

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

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

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

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

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

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

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

..........

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

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

...........

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

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

1-1;

1-13 l-20 l-23 l-25 l-29 l-33 l-37 1-41

2-31

2-47 2-55 2-58

3-2 3-2

3-4 3-15

5a-2 5a-4 5a-7 5a-8

5b-22 5b-29

5b-44 5b-50 513-56 513-63 5b-77 5b-86

513-94 5b-131 5b-132

6-3

6-9 6-18 6-22 6-24 6-25 6-26 6-27 6-28 6-29

Contents-12

6-11. Right Side View, Attaching Hardware

6-12. RF Connector and Hardware - Standard ................

6-13. Chassis Parts ............................

6-14. Portable Chassis (Option AX2) ....................

6-15. Miscellaneous Replaceable Accessories .................

7-1. Calibration Constant Information 8-1. Service-Related Special Functions

8-2. Self-Test List ............................

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

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

6-30

6-31

6-37

6-38

6-39

7-7 8-2 8-6

Contents-13

Performance Tests

The procedures in this chapter test the electrical performance of the synthesized sweeper. These tests do not require access to the interior of the instrument.

Notes

1. For these tests to be considered valid, the following conditions must be met:

n Warm up the synthesized sweeper for at least 1 hour before performing

any tests.

n Perform the tests in the order that they appear. n Use the test equipment listed in each test (or in the Recommended Test

Equipment table located behind the “Quick Reference” tab).

n Perform the tests under normal operating conditions as stated in the

specification tables in the HP

Sweepers User’s Guide.

2. In all cases where you are instructed to preset the synthesized sweeper, use the factory preset mode only.

3. In all cases where you are instructed to turn on RF peaking, ensure that the RF output connector is terminated in 50 ohms. Normally, this will be accomplished by setting up the equipment according to the test setup

diagram prior to turning on RF peaking.

4. The person who performs the test must supply any necessary cables,

connectors, and adapters.

5. These tests contain a minimum set of data points. The performance of the

synthesized sweeper can be checked at other points within the specified range.

83751A/B

and HP

83752A/B

Synthesized

Test record

Record the results of these tests in the test record at the end of this chapter. (You may want to use a photocopy of the blank test record.) Results recorded at incoming inspection can

be used for comparison in periodic maintenance and troubleshooting, and after repairs or adjustments.

Calibration cycle

This instrument requires periodic verification of performance. Under normal use and environmental conditions, the instrument should be calibrated every two years. Normal use is defined to be about 2,000 hours of use per year.

Performance Tests

1 - 1

Recommended test equipment

The Recommended Test Equipment table (located behind the “Quick Reference” tab) is the complete list of equipment that is necessary to perform the procedures in this book. The

equipment listed is for the standard synthesized sweeper. If your instrument has Option

1ED

(type-N output connector), substitute equivalent type-N equipment where necessary. Test equipment is also listed in each procedure with the test setup. Other equipment can be

substituted for the recommended models (except where noted otherwise) if it meets or exceeds

the critical specifications listed.

Test setups

A diagram showing the test setup is included at the beginning of each procedure. Note that arrows in the diagrams indicate a connection to the instrument rear panel and do not indicate signal flow.

l-2

Performance Tests

Internal Timebase: Aging Rate (Option

lE5

only)

Internal Timebase: Aging Rate (Option

This procedure checks the accuracy of the internal timebase. The time required for a specific phase change is measured both before and after a specified waiting period. The aging rate is

inversely proportional to the absolute value of the difference in the measured times.

The overall accuracy of the internal

TBC

&AR ltTE fLE

TBC = AR = TE = LE =

After the following things happen:

n The n The instrument keeps the same orientation with respect to the earth’s magnetic field.

The instrument stays at the same altitude.

The instrument does not receive any mechanical shock.

If the readjust the frequency returns to within fl Hz of the original frequency.

timebase

aging rate temperature effects line effects

timebase

calibration

is adjusted, the

oven does not cool down.

oven cools (the instrument is disconnected from AC power), you may have to

where :

frequency after a new warmup cycle. Typically, however, the

timebase

is a function of:

frequency should stay within the aging rate if the

lE5

only)

timebase

Note

Frequency changes due either to a change in orientation with respect to the earth’s magnetic field, or to a change in altitude, usually go away when the instrument is returned to its original position. A frequency change due to mechanical shock usually appears as a fixed frequency error.

The internal minutes, but for best accuracy, test again after the instrument has been on or

in standby condition for 24 hours.

timebase

can be tested after reconnecting AC power for 10

Recommended equipment

HP 54111D digitizing oscilloscope HP 5061B frequency standard

Performance Tests l-3

Internal Timebase: Aging Rate (Option

lE5

only)

10 MHz

SYNTHESIZED SWEEPER

sg422ob

REF

DIGITIZING

OSCILLOSCOPE

FREQUENCY

STANDARD

Figure l-l. Internal Timebase: Aging Rate Test Setup

To set up the equipment

1. Connect the equipment as shown in Figure l-l. Preset all instruments and let them warm up for at least one hour.

Note

If the oscilloscope does not have a through a 50R feedthrough.

2. On the oscilloscope, adjust the external triggering for a display of the OUTPUT signal from the synthesized sweeper:

Channel 1:

Display On Volts/Division 120 mV

Input Coupling dc Input Impedance

50R

input impedance, connect channel 1

10MHz

REF

Channel 2:

Display Off

Timebase:

Time/Division

5 ns Delay 0 s Delay Reference At center

Sweep Trig'd

Trigger:

Trigger Mode

Edge Trig 3 Level 100 mV Trigger Src Trig 3

Input Impedance

50R

Input Coupling dc

Display:

Display Mode

Real time

l-4 Performance Tests

Internal Timebase: Aging Rate (Option

To measure the frequency changes over a 24-hour period

1. Monitor the time and the display. Note the time required for a 360” phase change:

2. Wait 3 to 24 hours. Note how long you waited: T2 =

3. Repeat step 1. Record the phase change time: T3 =

4. Calculate the aging rate as follows:

lE5

only)

Aging Rate = (1 cycle/l0 MHz) For example:

351 seconds

T2 = 3 hours

T3 = 349 seconds

= (1 =

1.306~10-‘~

5. Enter the aging rate on the test record.

Note

If the absolute frequency of the standard and of the extremely close, you can reduce the measurement time measuring the time required for a phase change of less than 360”. In step 6, change 1 cycle to 0.5 cycle for

cycle/l0 MHz) (1/35ls - 1/349s) (24h/3h)

per day

(l/T1 - l/T3)

180”,

(24

hours/T2)

or 0.25 cycle for 90”.

timebase

(Tl

and T3) by

oscillator are

Adjustments you may need to perform

10 MHz Standard

What to do in case of difficulty

1. Ensure that the instruments have warmed up long enough and that environmental

conditions have not changed throughout the test.

2. If the frequency standard and the internal standard are very different in frequency, the time required for a 360” phase shift is too short for an accurate measurement. If the 360” phase

shift takes less than two minutes, perform the “10 MHz Standard” adjustment.

3. Refer to Chapter 5, “Troubleshooting,” in this manual.

Performance Tests l-5

CW Frequency Accuracy

This procedure applies to

all

instrument options except Option

lE5.

In this procedure, a frequency counter is used to measure the minimum and maximum synthesized sweeper frequencies in CW. Self-tests then verify that the internal hardware is functioning properly to

maintain frequency accuracy over the full frequency range.

Specification

410 DDm

Conditions

“C

Recommended equipment

HP 5343 Option 001 frequency counter

FREQUENCY COUNTER

sg421ab

Figure 1-2. CW Frequency Accuracy Test Setup

To set up the equipment

1. Preset the instruments and let them warm up for at least 1 hour.

2. Connect the equipment as shown in Figure 1-2. If you have an HP

83752A/B,

connect the RF output to the 10 Hz-500 MHz input of the frequency counter. If you have an HP

83751A/B,

connect the RF output to the 500 MHz-26.5

GHz

input.

To measure the CW frequency accuracy

1. If you have an HP If you have an HP

2. Read the CW frequency displayed on the frequency counter and record that value in the test record.

3. Connect the synthesized sweeper’s output to the 500 MHz-26.5 frequency counter (if it is not already connected this way).

4. Set the synthesized sweeper to a CW frequency of 20

5. Read the CW frequency displayed on the frequency counter and record that value in the test record.

83752A/B,

83751A/B,

set the synthesized sweeper to a CW frequency of 10 MHz.

set the CW frequency to 2

GHz.

GHz

input of the

GHz.

l-6 Performance Tests

To run the self-tests

1. On the synthesized sweeper, press:

CW Frequency Accuracy

( SHIFT]

If self-test does not pass, refer to Chapter 5, “Troubleshooting,” in this manual.

SPECIAL

Adjustments you may need to perform

100 MHz VCXO

Calibrate Frac-N VCO (automated)

What to do in case of difficulty

1. Make sure the frequency counter has a current calibration sticker and that it meets its published specifications.

2. If self-test fails, make sure nothing is connected to the instrument.

3. Refer to Chapter 5, “Troubleshooting,” in this manual.

Performance Tests 1-7

Swept Frequency Accuracy

With the synthesized sweeper in swept mode, the spectrum analyzer is set to zero span at the measurement frequency. As the synthesized sweeper sweeps through the spectrum analyzer frequency setting, a signal is generated on the spectrum analyzer’s video output that is input to the oscilloscope.

The synthesized sweeper’s TRIGGER OUTPUT, used to trigger the oscilloscope, is a series of

1601 pulses, evenly spaced during the sweep. The oscilloscope is triggered on the pulse that represents the desired measurement frequency, and the spectrum analyzer is tuned to display the video output on the oscilloscope.

Specification

flO0

ppm of

span

ktimebase

Recommended equipment

HP 8566B spectrum analyzer HP

54lllD

digitizing oscilloscope

RECORDER

VIDEO OUTPUT

Conditions

20 to 30

100 ms sweep

DIGITIZING OSCILLOSCOPE

CHAN 1

TRIG 3

J I I

CHAN 2

sg413ob

Figure 1-3. Swept Frequency Accuracy Test Setup

l-8 Performance Tests

OUTPUT

\DAPTER

To set up the equipment

Swept Frequency Accuracy

1. Preset all instruments and let

2. Connect the equipment as shown in Figure l-3.

3. On the spectrum

analyzer, set the center frequency to the first center frequency listed in

them warm up for at least 1 hour.

Table l-l.

4. On the spectrum analyzer, set: span:

Reference Level:

0 Hz

dBm

Scale Log: 10 dB/div Video Bandwidth: Resolution Bandwidth: 300 CF Step Size:

3 MHz

kHz

5. On the oscilloscope, set:

Note

Trigger 3 is a trigger enable that ensures that channel 2 (the true trigger) triggers only on a forward sweep after the specified number of events

(events = points in a sweep).

Channel 1:

Display Volts/Division

Offset

On 300

Input Coupling dc Input Impedance 1

Channel 2:

Display Volts/Division Offset

2v Input Coupling dc Input Impedance 1

Timebase:

Time/Division Delay

Delay Reference At center Sweep

Triggered

Trigger:

Trigger Mode Trigger Src

Trigger Level Trigger Src

Trigger Src Trigger Level Trigger Mode Trigger After

Edge Chan 2

1.6V

Trig 3

Lo Sens

1.6V

Events

Positive Edge

Performance Tests l-9

Swept Frequency Accuracy

Trigger On

Trig 3 (initial setting) Trigger On 3 events Trigger On Positive edge Trigger On

Channel 2

Display :

Display Mode

Real time

6. Set the sweep time on the synthesized sweeper to 100 ms.

7. Set the power level on the synthesized sweeper to 0

dBm.

To measure the swept frequency accuracy at 100 ms sweep speed

1. While viewing the oscilloscope display, adjust the center frequency of the spectrum analyzer so that the video signal is centered on the graticule. Use the front panel knob of the spectrum analyzer to roughly center the signal and then use the step keys for better resolution.

-125.000 us

0.00000

125.000

1.000

Ch.

Ch. 2

Timebose

300.0

=1 .a00 Volts/div

=25.

mVolts/div

us/div

Offset

Offset Offset

= 2.000

volts Volts

0.000 s

sg426ah

Figure 1-4. Video Signal on the Oscilloscope

2. On the spectrum analyzer display, note the final center frequency setting required to center

the video signal.

Note

Adjust the channel 1 offset to set the peak on a graticule to better determine when the signal is centered.

3. In Table l-l, record the difference between the initial center frequency setting and the

value noted in step 2 as frequency error.

4. Repeat steps 1 through 3 for the remaining instrument settings in Table l-l.

l-10 Performance Tests

+ 405 hidden pages

Keysight (Agilent) 83751A Service Guide

Specifications and Main Features

Frequently Asked Questions

User Manual