Keysight Technologies 53147A, 53149A, 53148A Service Manual

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Keysight 53147A/148A/149A Microwave Frequency Counter/Power Meter/DVM

Assembly Level Service Guide

Notices

CAUTION

WARNING

duced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws.

Manual Part Number

53147-90010

Edition

Edition 3, November 1, 2017

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies Bayan Lepas Free Industrial Zone, 11900 Penang, Malaysia

Technology Licenses

The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

Declaration of Conformity

U.S. Government Rights

The Software is “commercial computer software,” as defined by Federal Acquisition Regulation (“FAR”) 2.101. Pursuant to FAR 12.212 and 27.405-3 and Department of Defense FAR Supplement (“DFARS”) 227.7202, the U.S. government acquires commercial computer software under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA). The license set forth in the EULA represents the exclusive authority by which the U.S. government may use, modify, distribute, or disclose the Soft-ware. The EULA and the license set forth therein, does not require or per-mit, among other things, that Keysight: (1) Furnish technical information related to commercial computer soft-ware or commercial computer software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights customarily provided to the public to use, modify, reproduce, release, per-form, display, or disclose commercial computer software or commercial com-puter software documentation. No additional government requirements beyond those set forth in the EULA shall apply, except to the extent that those terms, rights, or licenses are explicitly required from all providers of commercial computer software pursu-ant to the FAR and the DFARS and are set forth specifically in writing else-where in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR

2.101, pursuant to FAR 12.211 and

27.404.2 and DFARS 227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR

27.401 or DFAR 227.7103-5 (c), as applicable in any technical data.

Warranty

THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED “AS IS,” AND IS SUBJECT TO BEING CHANGED, WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, KEYSIGHT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH REGARD TO THIS MANUAL AND ANY INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEYSIGHT SHALL NOT BE LIABLE FOR ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, USE, OR PERFORMANCE OF THIS DOCUMENT OR OF ANY INFORMATION CONTAINED HEREIN. SHOULD KEYSIGHT AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT WITH WARRANTY TERMS COVERING THE MATERIAL IN THIS DOCUMENT THAT CONFLICT WITH THESE TERMS, THE WARRANTY TERMS IN THE SEPARATE AGREEMENT SHALL CONTROL.

Safety Information

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met.

A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

2 Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide

Serial Prefix Number

This guide describes how to service the Keysight 53147A, 53148A, and 53149A. The information in this guide applies to instruments having the number prefix listed below, unless accompanied by a “Manual Updating Changes” package indicating otherwise.

SERIAL PREFIX NUMBER: US4047 (53147A)

Certification and Warranty

Certification

Keysight Technologies certifies that this product met its published specification at the time of shipment from the factory. Keysight further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of other International Standards Organization members.

US4048 (53148A) US4049 (53149A)

Warranty

Keysight warrants Keysight hardware, accessories and supplies against defects in materials and workmanship for a period of one year from date of shipment. If Keysight receives notice of such defects during the warranty period, Keysight will, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.

Keysight warrants that Keysight software will not fail to execute its programming instructions, for the period specified above, due to defects in material and workmanship when properly installed and used. If Keysight receives notice of such defects during the warranty period, Keysight will replace software media which does not execute its programming instructions due to such defects.

Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide 3

Keysight does not warrant that the operation of Keysight products will be uninterrupted or error free. If Keysight is unable, within a reasonable time, to repair or replace any product to a condition as warranted, customer will be entitled to a refund of the purchase price upon prompt return of the product.

Keysight products may contain remanufactured parts equivalent to new in performance or may have been subjected to incidental use.

The warranty period begins on the date of delivery or on the date of installation if installed by Keysight. If customer schedules or delays Keysight installation more than 30 days after delivery, warranty begins on the 31st day from delivery.

Warranty does not apply to defects resulting from (a) improper or inadequate maintenance or calibration, (b) software, interfacing, parts or supplies not supplied by Keysight, (c) unauthorized modification or misuse, (d) operation outside of the published environmental specifications for the product, or (e) improper site preparation or maintenance.

TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY OR CONDITION, WHETHER WRITTEN OR ORAL, IS EXPRESSED OR IMPLIED AND Keysight SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE.

Keysight will be liable for damage to tangible property per incident up to the greater of $300,000 or the actual amount paid for the product that is the subject of the claim, and for damages for bodily injury or death, to the extent that all such damages are determined by a court of competent jurisdiction to have been directly caused by a defective Keysight product.

TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOLE AND EXCLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL Keysight OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE.

For consumer transactions in Australia and New Zealand: the warranty terms contained in this statement, except to the extent lawfully permitted, do not exclude, restrict or modify and are in add ition to the mand atory statutory rights applicable to the sale of this product to you.

4 Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide

Safety Symbols

The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument.

Direct current (DC) Alternating current (AC)

Caution, risk of danger (refer to this manual for specific Warning or Caution information)

Earth (ground) terminal Frame or chassis (ground) terminal

Alternating current (AC) Direct current (DC)

Caution, risk of electric shock

Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide 5

Safety Considerations

WARNING

Read the information below before using this instrument.

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

Safety Earth Ground

An uninterruptible safety earth ground must be maintained from the mains power source to the product’s ground circuitry.

WHEN MEASURING POWER LINE SIGNALS, BE EXTREMELY CAREFUL AND ALWAYS USE A STEP-DOWN ISOLATION TRANSFORMER WHICH OUTPUT IS COMPATIBLE WITH THE INPUT MEASUREMENT CAPABILITIES OF THIS PRODUCT. THIS PRODUCT’S FRONT AND REAR PANELS ARE TYPICALLY AT EARTH GROUND. THUS, NEVER TRY TO MEASURE AC POWER LINE SIGNALS WITHOUT AN ISOLATION TRANSFORMER.

INSTRUCTIONS FOR ADJUSTMENTS WHILE COVERS ARE REMOVED AND FOR SERVICING ARE FOR USE BY SERVICE-TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM SUCH ADJUSTMENTS OR SERVICING UNLESS QUALIFIED TO DO SO.

ANY INTERRUPTION OF THE PROTECTIVE GROUNDING CONDUCTOR (INSIDE OR OUTSIDE THE PRODUCT’S CIRCUITRY) OR DISCONNECTING THE PROTECTIVE EARTH TERMINAL WILL CAUSE A POTENTIAL SHOCK HAZARD THAT COULD RESULT IN PERSONAL INJURY. (GROUNDING ONE CONDUCTOR OF A TWO CONDUCTOR OUTLET IS NOT SUFFICEIENT PROTECTION.)

6 Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide

Whenever it is likely that the protection has been impaired, the instrument must be made inpoerative and be secured against any unintended operation.

If this instrument is to be energized via an autotransformer (for voltage reduction), make sure the common terminal is connected to the earthed pole terminal (neutral) of the power source.

Instructions for adjustments while covers are removed and for servicing are for use by trained personnel only. To avoid dangerous electric shock, do not perform such ajdustments or servicing unless qualified to do so.

For continued protection against fire, replace the line fuse(s) with fuses of the same current rating and type (for example, normal blow, time delay). Do not use repaired fuses or short-circuited fuseholders.

Acoustic Noise Emissions

LpA<47 dB at operator position, at normal operation, tested per EN 27779. All data are the results from type test.

Geräuschemission

LpA<47 dB am Arbeits platz, normaler Betrieb, geprüft nach EN 27779. Die Angagen beruhen auf Ergebnissen von Typenprüfungen.

Electrostatic Discharge Immunity Testing

When the product is tested with 8kV AD, 4kV CD and 4kV ID according to IEC801-2, a system error may occur that may affect measurement data made during these disturbances. After these occurrences, the system self-recovers without user intervention.

Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide 7

Waste Electrical and Electronic Equipment (WEEE) Directive

This instrument complies with the WEEE Directive marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

Product category:

With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.

The affixed product label is as shown below.

Do not dispose in domestic household waste.

8 Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide

Serial Prefix Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Certification and Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Acoustic Noise Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Geräuschemission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Electrostatic Discharge Immunity Testing . . . . . . . . . . . . . . . . . . . . . . . .7

Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . .8

Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

1 Performance Tests - Verifying Specifications

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Operational Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Complete Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Recommended Calibration Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Operational Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Power-On Self Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

10 MHz Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Run Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

External Timebase Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Power Meter Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

DVM Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Keysight 53147A/148A/149A Assembly Level Service Guide 9

Complete Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Test 1: Channel 1 Frequency Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . 31

Test 1a: 10 Hz to 20 MHz Frequency Sensitivity . . . . . . . . . . . . . . . 31

Test 1b: 50 MHz to 125 MHz Frequency Sensitivity . . . . . . . . . . . . . 33

Test 2: Channel 2 Frequency Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . 35

Test 2a: 50 MHz to 20 GHz Frequency Sensitivity . . . . . . . . . . . . . . 35

Test 2b: 22 GHz to 26.5 GHz Frequency Sensitivity . . . . . . . . . . . . . 37

Test 2c: 30 GHz to 46 GHz Frequency Sensitivity . . . . . . . . . . . . . . 38

Test 3: Power Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Power Measurement Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . 39

Test 4: Power Reference Oscillator Frequency . . . . . . . . . . . . . . . . . . . 42

Power Reference Oscillator Frequency Test . . . . . . . . . . . . . . . . . . . 42

Test 5: Power Meter Reference Level . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Power Meter Reference Level: Method 1 . . . . . . . . . . . . . . . . . . . . . 44

Power Meter Reference Level: Method 2 . . . . . . . . . . . . . . . . . . . . . 46

Performance Test Record (Page 1 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 51

Performance Test Record (Page 2 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 52

Performance Test Record (Page 3 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 53

2Service

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Returning the Instrument to Keysight Technologies for Service . . . . . 57

Providing Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Packing the Instrument in the Original Packaging Materials . . . . . . 58

Packing the Instrument in Commercially Available Packaging

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

10 MHz Timebase Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Power Reference Oscillator Frequency Calibration . . . . . . . . . . . . . 62

Power Reference Oscillator Level Adjustment . . . . . . . . . . . . . . . . . 66

DVM Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Pre-Troubleshooting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

10 Keysight 53147A/148A/149A Assembly Level Service Guide

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Repair Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

After Service Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Assembly Identification and Location . . . . . . . . . . . . . . . . . . . . . . . .79

Troubleshooting the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Power Supply Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

3 Replacing Assemblies - Disassembly and Reassembly

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Do This First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Removing the Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

Removing the Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Removing the Bumper Retainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

Removing the Shroud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Removing the Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Removing the Rear Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .101

Removing the Cooling Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103

Removing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

4 Replaceable Parts

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

How To Order A Part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

Contacting Keysight Technologies . . . . . . . . . . . . . . . . . . . . . . . . .111

Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

Reference Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

Cabinet Parts and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

Accessories and Miscellaneous Items . . . . . . . . . . . . . . . . . . . . . . .112

5 Backdating

Keysight 53147A/148A/149A Assembly Level Service Guide 11

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

6Specifications

A Rack Mounting the Instrument

Rack Mounting the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

12 Keysight 53147A/148A/149A Assembly Level Service Guide

List of Figures

Figure 1-1 External Timebase Test Setup . . . . . . . . . . . . . . . . . . .25

Figure 1-2 DVM Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Figure 1-3 10 Hz to 20 MHz Frequency Sensitivity Test Setup . .32 Figure 1-4 50 MHz to 125 MHz Frequency Sensitivity Test

Figure 1-5 50 MHz to 20 GHz Frequency Sensitivity Test Setup .36

Figure 1-6 Power Measurement Accuracy Test Setup . . . . . . . . .39

Figure 1-7 Reference Oscillator Frequency Adjustment Setup . .43 Figure 1-8 E4418B Power Meter Zeroing and Calibration Test

Figure 1-9 Power Meter Reference Level Test Setup . . . . . . . . . .45

Figure 1-10 Keysight 8120-1082 Power Sensor Cable End View . . 46

Figure 1-11 Power Meter Reference Level Test Setup . . . . . . . . . .47

Figure 2-1 Calibrating the 10 MHz Frequency Reference

Figure 2-2 Reference Oscillator Frequency Adjustment Setup . .63 Figure 2-3 Power Reference Oscillator Adjustment Locations . . .65 Figure 2-4 E4418B Power Meter Zeroing and Calibration Test

Figure 2-5 Power Meter Reference Level Test Setup . . . . . . . . . .67

Figure 2-6 Keysight 8120-1082 Power Sensor Cable End View . .68

Figure 2-7 Power Meter Reference Level Calibration Setup . . . . .69

Figure 2-8 DVM Tests Main Menu . . . . . . . . . . . . . . . . . . . . . . . . .74

Figure 2-9 Replaceable Assembly Locations — Top Internal View 80

Figure 2-10 A4 DC Power Supply Test-Point Locations . . . . . . . . .81

Figure 3-1 Removing the Bumpers . . . . . . . . . . . . . . . . . . . . . . . .93

Figure 3-2 Removing the Handle . . . . . . . . . . . . . . . . . . . . . . . . . .94

Figure 3-3 Removing the Bumper Retainers . . . . . . . . . . . . . . . . .95

Figure 3-4 Removing the Shroud . . . . . . . . . . . . . . . . . . . . . . . . .97

Figure 3-5 Removing the Front Panel Assembly . . . . . . . . . . . . . .99

Figure 3-6 Rear Panel Assembly Screws . . . . . . . . . . . . . . . . . . .101

Figure 3-7 Cooling Fan Screws . . . . . . . . . . . . . . . . . . . . . . . . . .103

Figure 3-8 Removing the Power Supply . . . . . . . . . . . . . . . . . . .104

Figure 4-1 Keysight 53147A/148A/149A Exploded View — Internal

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Keysight 53147A/148A/149A Assembly Level Service Guide 13

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Figure 4-2 Keysight 53147A/148A/149A Exploded View — Cabinet

and External Parts . . . . . . . . . . . . . . . . . . . . . . . . . 114

Figure 4-3 Keysight 53147A/148A/149A Top View . . . . . . . . . . 115

14 Keysight 53147A/148A/149A Assembly Level Service Guide

List of Tables

Table 1-1 Recommended Test Equipment and Accessories . . . .20

Table 1-2 Complete Performance Tests . . . . . . . . . . . . . . . . . . . .30

Table 1-3 Range Calibrator Settings and Expected Results . . . . 41

Table 2-1 Recommended Test Equipment and Accessories . . . .59

Table 2-2 Keysight 53147A/148A/149A Assembly Identification 79

Table 2-3 A4 Power Supply Inputs and Outputs . . . . . . . . . . . . .82

Table 2-4 Self-Test Messages . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Table 2-5 Front Panel Display Error Messages . . . . . . . . . . . . . .85

Table 2-6 RS-232 Error Messages . . . . . . . . . . . . . . . . . . . . . . . .86

Table 4-1 Reference Designations . . . . . . . . . . . . . . . . . . . . . . .112

Table 4-2 Keysight 53147A/148A/149A Replaceable Parts . . .116 Table 4-3 Keysight 53147A/148A/149A Accessories and Miscella-

neous Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119

Keysight 53147A/148A/149A Assembly Level Service Guide 15

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16 Keysight 53147A/148A/149A Assembly Level Service Guide

Keysight 53147A/148A/149A Microwave Frequency Counter/ Power Meter/DVM

Assembly Level Service Guide

1 Performance Tests -

Verifying Specifications

Introduction 18 Equipment Required 20 Operational Verification 22 Complete Performance Tests 30 Test 1: Channel 1 Frequency Sensitivity 31 Test 2: Channel 2 Frequency Sensitivity 35 Test 3: Power Measurement 39 Test 4: Power Reference Oscillator Frequency 42 Test 5: Power Meter Reference Level 44 Performance Test Record (Page 1 of 3) 51 Performance Test Record (Page 2 of 3) 52 Performance Test Record (Page 3 of 3) 53

1 Performance Tests - Verifying Specifications

Introduction

This chapter provides procedures to test the electrical performance of the Keysight 53147A, 53148A, and 53149A. These procedures are based on the specifications in Chapter 6, “Specifications”.

Two types of testing are provided:

– Operational Verification

– Complete Performance Tests

This chapter is organized as follows:

– “Introduction” pg. 18

– “Equipment Required” pg. 20

– “Operational Verification” pg. 22

– “Complete Performance Tests” pg. 30

– “Performance Test Record” pg. 51

Operational Verification

Operational Verification is an abbreviated series of tests that you can perform (instead of performing the Complete Performance Tests) to provide a high degree of confidence that the instrument is operating properly. Operational Verification is useful for incoming inspection, routine maintenance, and after instrument repair.

Complete Performance Tests

The Complete Performance Tests verify the specifications listed in Chapter 6,

“Specifications”. All tests can be performed without opening the instrument.

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Performance Tests - Verifying Specifications 1

Recommended Calibration Cycle

The instrument requires periodic verification of operation. Depending on the type of use, environmental conditions, aging, and measurement accuracy required, the instrument should be checked using the operational verification procedure at least once every year. A full Calibration and Performance Test should be performed each time the instrument changes environment or if an assembly or module has been replaced.

Test Record

The results of the Operational Verification and the Complete Performance Tests should be recorded on a copy of the Performance Test Record, located at the end of the “Complete Performance Tests” section in this chapter.

Keysight 53147A/148A/149A Assembly Level Service Guide 19

1 Performance Tests - Verifying Specifications

Equipment Required

Table 1-1 lists the test equipment and accessories needed to perform the tests in

this chapter.

Tab le 1-1 Recommended Test Equipment and Accessories

Quantity

Instrument Type Required Characteristics

Synthesized Signal Generator

Microwave Synthesized Signal Generator

Microwave Amplifier 45 MHz to 50 GHz Keysight 83051A 1 P, T

Digital Multimeter 6½ digit AC/DC Keysight 34401A 1 OV, P

DC Power Supply 25 VDC Keysight E3640A 1 OV

Frequency Counter 10 Hz to 125 MHz Keysight 53150A/51A/52A 1 P, C, T

Power Meter Range 1 mW Keysight 432A 1 P, C, T

Power Meter 50 MHz to 50 GHz, +13 dBm to –50 dBm Keysight 437B 1 P, C, T

10 Hz to 20 MHz, +7 dBm to –40 dBm Keysight 3325A/B 2 OV, P, T

10 MHz to 50 GHz, Accuracy >1 x 10 +7 dBm to –50 dBm

-10

Model Recommended

Keysight 83650B 1 P, T

[a]

Required

Use

[b]

Power Meter 100 kHz to 110 GHz, –70 dBm to +44 dBm Keysight E4418B 1 P, C, T

Thermistor Mount

Power Sensor 10 MHz to 18 GHz, -30 dBm to +20 dBm Keysight 8481A 1 P, T

Power Sensor 50 MHz to 50 GHz, +13 dBm to –50 dBm Keysight 8487A 1 P, C, T

Power Sensor Cable 2.4 mm to 2.4 mm, 5 ft. Keysight 11730A

Power Sensor Cable Keysight 8120-1082 1 P, T

Range Calibrator

20 dB Attenuator

Power Splitter

SWR 1.05 at 50 MHz Accuracy ±0.5% at 50 MHz

3, 10, 30, 100, and 300 µW 1, 3, 10, 30, and 100 mW

DC to 50 GHz

2.4 mm (m) to 2.4 mm (f)

DC to 50 GHz

2.4 mm (f3x)

Keysight 478A-H75 or 478A-H76

Keysight 11683A 1 P

Keysight 8490D (Opt. 020)

Keysight 11667C/D 1 P, T

1P, T

[c]

1P, T

P, T

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Performance Tests - Verifying Specifications 1

Table 1-1 Recommended Test Equipment and Accessories (continued)

Instrument Type Required Characteristics

Cables

BNC (m) to BNC (m)

2.4 mm (m) to 2.4 mm (m)

BNC (f) to Type N (m) BNC (m) to SMA (f)

3.5 mm (f) to 2.92 mm (m)

Adapters

2.92 mm (m) to 2.4 mm (m)

2.92 mm (m) to 2.4 mm (f)

2.4 mm (m) to 2.4 mm (m)

2.4 mm (f) to 2.4 mm (f)

[a] Equivalent equipment can be substituted for all instruments and accessories.

[b] OV = Operational Verification P = Performance Tests C = Calibration T = Troubleshooting

[c] One supplied with Keysight 53147A/48A/49A

Model Recommended

Keysight 10503 series

Keysight E9635A Keysight 1250-2015 — Keysight 11904A Keysight 11904D Keysight 11900A Keysight 11900B

Quantity

[a]

Required

Use

[b]

2OV, P,

C, T

1 1 1 1

P, C , T 1 1 1

Keysight 53147A/148A/149A Assembly Level Service Guide 21

1 Performance Tests - Verifying Specifications

NOTE

Operational Verification

If you are not familiar with operating the instrument, you should review the Chapter 1, “Getting Started,” in the Keysight 53147A/148A/149A Operating Guide. However, the procedures in this chapter are written so that little experience is necessary. These procedures should be followed in the order in which they appear.

Power-On Self Tests

This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Inspect the instrument for damage.

2 Make sure no cables are connected to the instrument’s inputs.

3 Connect the power cord to the instrument and the power source.

– Since the instrument’s power supply automatically senses the line voltage,

there is no AC input-voltage setting.

– It is normal for the fan in the instrument to run when the instrument is in

Standby mode. Power is supplied to the timebase whenever the power cord is connected to maintain long-term measurement reliability, and the fan helps to maintain the timebase’s temperature stability.

4 Press and release the Power button on the front panel.

22 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

5 Verify that the front-panel display shows the following:

– All segments of the front-panel display are temporarily activated.

– TESTING is displayed.

– SELF TEST OK is displayed.

– The model number of the instrument is displayed (a four-d

– GPIB ADDR nn (nn = a two digit number from 0 to 30) is displayed.

– CH2 NO SIGNAL is displayed.

6 If an error message is displayed, refer to the troubleshooting section in

Chapter 2, “Service”

7 Mark Pass or Fail in the “Performance Test Record” on page 51, “Test 1”.

To ensure that the test results are valid, the instrument and the test equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment and the timebase to stabilize.

10 MHz Test

1 Connect a BNC-to-BNC cable from the Reference 10MHz connector on

the instrument’s rear panel to the CHANNEL 1 input connector on the front panel.

2 Press and release the Chan Select key.

3 Verify that Ch 1 is displayed in the upper-left corner of the display.

4 Verify that the display reads 10,000,000 Hz.

5 Mark Pass or Fail in the “Performance Test Record” on page 51, “Test 2”.

igit hex number

is also displayed).

Keysight 53147A/148A/149A Assembly Level Service Guide 23

1 Performance Tests - Verifying Specifications

NOTE

Run Self Test

This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Disconnect all signal cables from the input and Reference 10MHz connectors.

2 Press and release the Shift key, and then press and release the Menu (Reset/

Local) key.

3 Press the up- and/or down-arrow key(s) as many times as necessary until

DO SELF TEST is displayed.

4 Press and release the Enter key.

5 If no errors are detected, SELF TEST OK is briefly displayed when the self test

is completed. If any error messages are displayed, refer to the troubleshooting section in Chapter 2, “Service”.

6 Mark Pass or Fail in the “Performance Test Record” on page 51, “Test 3”.

External Timebase Test

This test verifies the instrument’s 10 MHz external timebase specification by verifying that setting REF OSC to EXT allows the instrument to be synchronized to an external reference signal.

Equipment Required

Keysight 3325A/B Synthesizer (2) Keysight 10100C 50Ω Feedthrough Terminator Keysight 10503 Series Coaxial Cables (BNC m to m) (2)

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– These tests are appropriate for the Keysight 53147A, 53148A, and 53149A.

24 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

1 Connect an Keysight 10503 series coaxial cable between the output of the first

Keysight 3325A/B Synthesizer and the Reference 10MHz connector on the instrument’s rear panel (see Figure 1-1).

2 Connect an Keysight 10100C 50Ω Feedthrough Terminator to the Counter’s

Channel 1 input connector.

3 Connect an Keysight 10503 series coaxial cable between the output of the

second Synthesizer and the feedthrough terminator on the Counter’s CHANNEL 1 input connector.

Keysight 3325A/B Synthesizer

To Reference

10 MHz Connector

(Rear Panel)

10 MHZ Output

Keysight 53147A/48A/49A

Channel 1 (with 10100C 50W Feedthrough Attached)

Keysight 3325A/B Synthesizer

2 MHz Output

Figure 1-1 External Timebase Test Setup

4 Cycle the POWER button to preset the instrument.

5 Press the Shift key on the instrument’s front panel.

6 Press the Menu key on the instrument’s front panel.

7 If necessary, use the up- and down-arrow keys to cycle the display until

it reads REF OSC > INT.

8 Press the right-arrow key once. INT begins to flash off and on.

9 Press the up- or down-arrow key once. INT changes to EXT.

10 Press the Enter key.

11 Press the Chan Select key once to select the CHANNEL 1 input connector.

Keysight 53147A/148A/149A Assembly Level Service Guide 25

1 Performance Tests - Verifying Specifications

NOTE

12 Set the frequency of the first Synthesizer (connected to the instrument’s

rear-panel Reference 10MHz connector) to 10 MHz at 1 V rms.

13 Set the frequency of the second Synthesizer (connected to the instrument’s

Channel 1 input connector) to 2 MHz at 100 mV rms.

14 Press and release the instrument’s Reset/Local key.

15 Verify that the Counter displays a reading of approximately 2 MHz and that the

Ext Ref annunciator is activated.

16 Mark Pass or Fail for “Test 4” in the “Performance Test Record” on page 51.

17 Disconnect the test setup.

Power Meter Test

This test verifies the accuracy of the Power Meter.

Equipment Required

Keysight 11730A Power Sensor Cable (supplied with instrument) Keysight 8481A, 8481D, 8482A, 8485A, or 8487A Power Sensor Head

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– These tests are appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Connect one end of the Keysight 11730A cable (supplied with instrument)

to the Power Meter INPUT connector on the front panel of the Keysight 53147A, 53148A, or 53149A.

2 Connect the other end of the Keysight 11730A cable to a power sensor head.

26 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

dBm

Watts mW uW %

Pwr

Ch 2

Freq

3 Press the Display Power key in the Power Meter area of the front panel.

The display should look like this (the reading will vary):

4 If the power sensor head you are using is an Keysight 8481A, 8481D, 8482A,

8485A, or 8487A, select the power sensor head model in the HEAD menu. If you are not using one of the power sensor heads listed above, press the Cal

Factor key, and enter the calibration factor for the head.

5 Press the Zero key.

The display shows ZEROING for several seconds.

6 Connect the power sensor head to the Power Meter OUTPUT connector.

7 Press the Cal key.

The display briefly shows CALIBRATING.

8 Turn on the power reference output in the instrument’s menu (PWR REF > ON).

9 Verify that the Counter displays a reading of 0 dBm ± .02 dB.

10 Mark Pass or Fail for “Test 5” in the “Performance Test Record” on page 51.

11 Disconnect the test setup.

Keysight 53147A/148A/149A Assembly Level Service Guide 27

1 Performance Tests - Verifying Specifications

NOTE

Keysight

K P

DVM Test

This test verifies the accuracy of the DVM.

Equipment Required

Keysight 34401A Digital Multimeter Keysight E3640A DC Power Supply

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– These tests are appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Set the output of the E3640A DC Power Supply to +25 VDC.

2 Set the Keysight 34401A Digital Multimeter to the lowest DC voltage range

capable of safely measuring 25 VDC.

3 Connect the test leads to the Multimeter (observe correct polarity).

4 Connect the test prods to the output terminals on the Keysight E3640A DC

Power Supply (observe correct polarity).

eysight E3640A

ower Supply

Keysight 34401A Digital Multimeter

Figure 1-2 DVM Test Setup

5 Observe and record the voltage reading on the Keysight 34401A Multimeter.

53147A/48A/49A

Keysight E3640A Power Supply

28 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

6 Disconnect the test leads from the Keysight E3640A DC Power Supply.

Be careful not to disturb the voltage setting.

7 Connect the test leads to the Keysight 53147A/48A/49A (be sure to observe

the correct polarity).

8 Press the Display DVM key on the Keysight 53147A/48A/49A front panel.

9 Connect the test prods to the output terminals on the Keysight E3640A

DC Power Supply (be sure to observe the correct polarity).

10 Observe and record the voltage reading on the Keysight 53147A/48A/49A.

11 Compare the voltage readings you recorded in steps 5 and 10. If the reading

taken with the Keysight 53147A/48A/49A is within ±0.25% ±10 mV of the reading taken with the Keysight 34401A, mark Pass for “Test 6” in the

“Performance Test Record” on page 51. If the reading taken with the Keysight

53147A/48A/49A is not within ±0.25% ±10 mV of the reading taken with the Keysight 34401A, mark Fail for “Test 6” in the “Performance Test Record” on page 51.

This completes the Operational Verification.

Keysight 53147A/148A/149A Assembly Level Service Guide 29

1 Performance Tests - Verifying Specifications

NOTE

Complete Performance Tests

The Complete Performance Tests verify the specifications of the Keysight 53147A/ 148A/149A listed in Chapter 6, “Specifications”. All of these tests can be performed without opening the instrument. Table 1 - 3 lists a summary of the performance tests.

Record the results of the performance tests in the appropriate place on the Performance Test Record, which starts on page 51.

Tab le 1-2 Complete Performance Tests

Page Number Test Description

Page 31 “Test 1: Channel 1 Frequency Sensitivity”

Page 35 “Test 2: Channel 2 Frequency Sensitivity”

Page 39 “Test 3: Power Measurement”

Page 42 “Test 4: Power Reference Oscillator Frequency”

Page 44 “Test 5: Power Meter Reference Level”

Other instrument measurement functions (e.g., Averaging) are mathematically derived by the microprocessor from the parameters verified by these performance tests. If the instrument passes the performance tests, the other measurement functions are also functioning to specifications.

30 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

Test 1: Channel 1 Frequency Sensitivity

This set of tests verifies the frequency-sensitivity specifications of Channel 1 of the Keysight 53147A/148A/149A’s Frequency Counter.

Equipment Required

Keysight 3325A/B Synthesizer Keysight 83650B Synthesizer Keysight 437B Power Meter Keysight 8487A/D Power Sensor Keysight 11730A Power Sensor Cable (provided with 53147A/148A/149A) Keysight 11667C Power Splitter Keysight 8490D (Opt. 020) 20 dB Attenuator Keysight 1250-2015 BNC (m) to SMA (f) Adapter Keysight 11904A 2.92 mm (m) to 2.4 mm (m) Adapter Keysight 10100C 50 Ω Feedthrough Terminator Keysight 10503 Series Coaxial Cable (BNC m to m) 2 mm (m) to 2 mm (f) Cable (2)

Test 1a: 10 Hz to 20 MHz Frequency Sensitivity

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– These tests are appropriate for the Keysight 53147A, 53148A, and 53149A.

– If the Keysight 3325A/B Synthesizer or the Keysight 83650B Synthesizer

reference output is not adequate to drive the 53147A/48A/49A, connect the cable from the Synthesizer to the Reference 10 MHz connector on the back of the 53147A/48A/49A, and set the 53147A/48A/49A to use the internal oscillator.

1 Connect an Keysight 10503 Series Coaxial Cable between the reference output

connector on the Keysight 3325A/B Synthesizer and the instrument’s

Reference 10MHz connector.

2 Connect an Keysight 10100C 50Ω Feedthrough Terminator to the Counter’s

CHANNEL 1 connector.

Keysight 53147A/148A/149A Assembly Level Service Guide 31

1 Performance Tests - Verifying Specifications

3 Connect an Keysight 10503 Series Coaxial Cable between the RF output

connector on the Keysight 3325A/B Synthesizer and the 50Ω feedthrough terminator on the Counter’s CHANNEL 1 connector.

o Reference Output (Rear Panel)

Keysight 3325A/B Synthesizer

To Reference

Output

(Rear

Keysight 53147A/48A/49A

Panel)

Output

Channel 1

Figure 1-3 10 Hz to 20 MHz Frequency Sensitivity Test Setup

4 Verify that the Counter is still set to use an external reference signal (refer to

steps 5 through 10 on page 25).

5 Set the output of the Synthesizer to the first frequency specified for “Test 1a”

in the “Performance Test Record” on page 51 (10 Hz).

6 Set the power output of the Synthesizer to the first power value specified for

“Test 1a” in the “Performance Test Record” on page 51 (–14.9 dBm/40 mV).

7 Record the frequency value read on the Counter (±1 count) for “Test 1a” in the

“Performance Test Record” on page 51.

8 Repeat steps 5, 6, and 7 for each of the remaining frequencies specified for

“Test 1a”. Don’t forget to change the power level when performing the 1 KHz

test (–19.2 dBm/25 mV).

9 If all of the frequency values you recorded for “Test 1a” are correct, mark Pass

in the Performance Test Record for “Test 1a”. If any of the frequency readings you recorded are incorrect, mark Fail in the Performance Test Record.

32 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

– Do not disconnect the cable from the instrument’s Reference 10MHz

connector. This connection is used in the following test.

– Do not turn off the instrument. Turning the instrument off and back on resets

the reference oscillator (REF OSC) selection to internal (INT) and the channel selection to CHANNEL 2.

Test 1b: 50 MHz to 125 MHz Frequency Sensitivity

1 Connect an Keysight 10100C 50 Ω Feedthrough Terminator to the CHANNEL 1

input connector on the instrument’s front panel (refer to Figure 1-4 for steps 1 through 9).

Figure 1-4 50 MHz to 125 MHz Frequency Sensitivity Test Setup

2 Connect the Keysight 1250-2015 BNC (m) to SMA (f) Adapter to the

Keysight 10100C Feedthrough Terminator on the Counter’s CHANNEL 1 connector.

3 Connect the Keysight 11904A 2.92 mm (m) to 2.4 mm (m) Adapter to the

Keysight 1250-2015 Adapter.

4 Connect the Keysight 8490D 20 dB Attenuator to the Keysight 11904A

Adapter.

Keysight 53147A/148A/149A Assembly Level Service Guide 33

1 Performance Tests - Verifying Specifications

NOTE

5 Connect one of the output connectors on the Keysight 11667C Power Splitter

to the Keysight 8490D Attenuator

6 Connect the Keysight 11900B 2.4 mm (f) to 2.4 mm (f) Adapter to the RF

output of the Synthesizer.

7 Connect a 2.4 mm (m) to 2.4 mm (m) cable between the Adapter on the

Synthesizer’s RF output connector and the input connector on the Keysight 11667C Power Splitter.

8 Connect the Keysight 8487A/D Power Sensor to the remaining output

connector on the Keysight 11667C Power Splitter.

9 Connect the Keysight 11730A Power Sensor Cable between the Power Sensor

and the sensor connector on the Keysight 437B Power Meter.

10 Verify that the Counter is still set to use an external reference signal (refer to

steps 5 through 10 on page 25).

11 Set the output of the Keysight 83650B Synthesizer to the first frequency

specified for “Test 1b” in the “Performance Test Record” on page 51 (50 MHz).

12 Set the power output of the Synthesizer (read on the Power Meter) to a power

value 20 dBm above the value specified for “Test 1b” in the “Performance Test

Record” on page 51 (+.8 dBm). (The added 20 dBm compensates for the 20 dB

Attenuator.)

13 Record the frequency value read on the Counter (±1 count) for “Test 1b” in the

“Performance Test Record” on page 51.

14 Set the output of the Synthesizer to 125 MHz, and repeat steps 11 through 13.

15 If both of the frequency values you recorded for “Test 1b” are correct, mark

Pass in the Performance Test Record for “Test 1b”. If either of the frequency readings you recorded are incorrect, mark Fail in the Performance Test Record.

16 Disconnect the Keysight 10100C Feedthrough Terminator, the

Keysight 1250-2015 Adapter, and the Keysight 11904A Adapter from the Counter’s CHANNEL 1 connector.

– Do not disconnect the rest of the test setup, as these connections are also

used in the Channel 2 Frequency Sensitivity test.

– Do not turn off the instrument. Turning the instrument off and back on resets

the reference oscillator (REF OSC) selection to internal (INT).

34 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

Test 2: Channel 2 Frequency Sensitivity

This set of tests verifies the frequency-sensitivity specifications of Channel 2 of the Keysight 53147A/148A/149A’s Frequency Counter.

Equipment Required

Keysight 83650B Synthesizer Keysight 437B Power Meter Keysight 8487A/D Power Sensor Keysight 11667C Power Splitter Keysight 11730A Power Sensor Cable (provided with 53147A/148A/149A) Keysight 8490D (Opt. 020) 20 dB Attenuator Keysight 11904D 2.92 mm (m) to 2.4 mm (f) Adapter Keysight 10503 series Coaxial Cable (BNC m to m)

2.4 mm (m) to 2.4 mm (m) Cable (2)

Test 2a: 50 MHz to 20 GHz Frequency Sensitivity

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Connect the Keysight 11904D 2.92 mm (m) to 2.4 mm (f) Adapter to the

Counter’s CHANNEL 2 input connector (refer to Figure 1-5 for steps 1 through

4).

2 Connect the Keysight 8490D Attenuator to the Keysight 11904D Adapter,

as shown in Figure 1-5 (the other end of the Attenuator should remain connected to the Keysight 11667C Power Splitter).

3 Verify that the cable (with Adapter) is still connected between the

RF output of the Keysight 83650B Synthesizer and the Power Splitter input connector.

Keysight 53147A/148A/149A Assembly Level Service Guide 35

1 Performance Tests - Verifying Specifications

HP 11667C Power Splitter

HP 8487A/D Power Sensor

HP 8490D 20 dB Att enuator (50 MHz to 40 GHz tests only)

Keysight 83650B Synthesizer

Keysight 437B Power Meter

HP 11904D Adapter

Keysight 53147A/48A/49A

Input

Channel 2

RF Output

To Reference

Output

(Rear Panel)

To Reference 10 MHz

Connector

(Rear Panel)

NOTE

4 Verify that the Power Sensor is still connected to the Power Splitter and that

the Power Sensor Cable is still connected between the Power Sensor and the sensor connector on the Power Meter.

Figure 1-5 50 MHz to 20 GHz Frequency Sensitivity Test Setup

5 Verify that the instrument is still set to use an external reference signal (refer to

steps 5 through 10 on page 25).

6 Set the output of the Keysight 83650B Synthesizer to the first frequency

specified for “Test 2a” in the “Performance Test Record” on page 52 (50 MHz).

7 Set the power output of the Synthesizer (read on the Power Meter) to a power

value 20 dBm above the value specified for “Test 2a” in the “Performance Test

Record” on page 52 (0 dBm). (The added 20 dBm compensates for the 20 dB

Attenuator.)

8 Record the frequency value read on the Counter (±1 count) for “Test 2a” in the

“Performance Test Record” on page 52.

9 Repeat steps 6, through 8 for each of the remaining frequencies specified for

“Test 2a”. Don’t forget to change the power level when performing the

300 MHz and 19 GHz tests (53147A, 53148A, and 53149A) and the 16 GHz and 19 GHz tests (53149A only).

It may be necessary to repeat Step 5.

36 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

10 If all of the frequency values you recorded for “Test 2a” are correct, mark Pass

in the Performance Test Record. If any of the frequency readings you recorded are incorrect, mark Fail in the Performance Test Record.

Test 2b: 22 GHz to 26.5 GHz Frequency Sensitivity

This test is appropriate for the Keysight 53148A and 53149A.

1 Use the same test setup as described for “Test 2a” on page 35.

2 Set the output of the Keysight 83650B Synthesizer to the first frequency

specified for “Test 2b” in the “Performance Test Record” on page 52 (22 GHz).

3 Set the power output of the Synthesizer (read on the Power Meter) to a power

value 20 dBm above the value specified for “Test 2b” in the “Performance Test

Record” on page 52 (–5 dBm for the Keysight 53148A;

–7 dBm for the Keysight 53149A). (The added 20 dBm compensates for the 20 dB Attenuator.)

4 Record the frequency value read on the Counter (±1 count) for “Test 2b” in the

“Performance Test Record” on page 52.

5 Repeat steps 2, through 4 for each of the remaining frequencies specified for

“Test 2b”.

6 If all of the frequency values you recorded for “Test 2b” are correct, mark Pass

in the Performance Test Record for “Test 2b”. If any of the frequency readings you recorded are incorrect, mark Fail in the Performance Test Record.

Keysight 53147A/148A/149A Assembly Level Service Guide 37

1 Performance Tests - Verifying Specifications

NOTE

Test 2c: 30 GHz to 46 GHz Frequency Sensitivity

This test is appropriate for the 53149A only.

1 Use the same test setup as described for “Test 2a” on page 35.

2 Set the output of the Keysight 83650B Synthesizer to the first frequency

specified for “Test 2c” in the “Performance Test Record” on page 52 (30 GHz).

3 Set the power output of the Synthesizer (read on the Power Meter) to a power

value 20 dBm above the value specified for “Test 2c” in the “Performance Test

Record” on page 52 (–3 dBm). (The added 20 dBm compensates for the 20 dB

Attenuator.)

4 Record the frequency value read on the Counter (±1 count) for “Test 2c” in the

“Performance Test Record” on page 52.

5 Repeat steps 2, through 4 for each of the remaining frequencies specified for

“Test 2c”. Don’t forget to change the power level for the 42, 44, and 46 GHz

tests.

6 If all of the frequency values you recorded for “Test 2c” are correct, mark Pass

in the Performance Test Record for “Test 2c”. If any of the frequency readings you recorded are incorrect, mark Fail in the Performance Test Record.

– Do not disconnect the Power Sensor or the Power Sensor Cable from the

power meter or the Power Splitter. These connections are reused in the following tests.

– Do not turn off the instrument. Turning the instrument off and back on resets

the reference oscillator (REF OSC) selection to internal (INT).

38 Keysight 53147A/148A/149A Assembly Level Service Guide

Test 3: Power Measurement

NOTE

Keysight 53147A/48A/49A

Output

Keysight 11683A

Range Calibrator

Power Input

This set of tests verifies the power-measurement specifications of Keysight 53147A/148A/149A’s Power Meter.

Equipment Required

Keysight 11683A Range Calibrator Keysight 11730A Power Sensor Cable (provided with 53147A/148A/149A)

Power Measurement Accuracy Test

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– These tests are appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Connect the Keysight 11730A Power Sensor Cable between Keysight 11683A

Range Calibrator’s output connector and the Keysight 53147A, 53148A, or 53149A’s Power Meter INPUT connector.

Performance Tests - Verifying Specifications 1

Keysight 53147A/148A/149A Assembly Level Service Guide 39

Figure 1-6 Power Measurement Accuracy Test Setup

2 Press the Reset/Local key on the Keysight 53147A, 53148A, or 53149A.

3 Press the Shift + dBm/W key on the Keysight 53147A, 53148A, or 53149A to

set the Power Meter to display readings in Watts, mW, and/or µW.

1 Performance Tests - Verifying Specifications

NOTE

4 Set the Range Calibrator switches as follows:

FUNCTION: STANDBY

POLARITY: NORMAL

RANGE: 1 mW

LINE: ON

5 Press the Zero key on the Keysight 53147A, 53148A, or 53149A. When the

reading appears, verify that it is 0.00 ±0.06 µW.

6 Change the Range Calibrator’s FUNCTION switch to CALIBRATE.

7 Press the Cal key on the Keysight 53147A, 53148A, or 53149A. Wait for the

Power Meter to complete calibration.

8 Verify that the Keysight 53147A, 53148A, or 53149A display reads

1.000 ±0.006 mW.

The Range Calibrator output level is adjustable in 5 dB increments. Thus, the 3 µW, 30 µW, 300 µW, 3 mW, and 30 mW legends on the RANGE switch are approximations. The true values for these settings are 3.16 µW, 31.6 µW, 316 µW, 3.16 mW, and 31.6 mW.

9 Set the Range Calibrator RANGE switch to each of the positions shown in

Table 1-3. For each setting, verify that the Keysight 53147A, 53148A, or

53149A autoranges properly and that the reading displayed is within the limits shown in the table.

– The lower the setting of the RANGE switch, the longer it takes for

the reading to stabilize.

– You may have to repeat Step 5 (re-zero the instrument) for each

measurement.

40 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

Table 1-3 Range Calibrator Settings and Expected Results

Range Calibrator Keysight 53147A/48A/49A

RANGE Switch Setting Minimum Actual Maximum

3 µW 3.10 µW 3.23 µW

10 µW 9.90 µW 10.10 µW

30 µW 31.4 µW 31.8 µW

100 µW 99.5 µW 100.5 µW

300 µW 0.314 mW 0.318 mW

1 mW 0.995 mW 1.005 mW

3 mW 3.14 mW 3.18 mW

10 mW 9.95 mW 10.05 mW

30 mW 31.4 mW 31.8 mW

100 mW 99.5 mW 100.5 mW

10 Record the actual power readings in the “Performance Test Record” on

page 51.

11 Press the Shift + dBm/W key on the Keysight 53147A, 53148A, or 53149A

again to set the Power Meter to display readings in dBm.

12 Verify that the annunciator changes to dBm and that the indication is within

20.00 ±00.04 dBm with the Range Calibrator’s RANGE switch in the 100 mw / 20 dBm position.

13 Record the actual power reading in the Performance Test Record.

14 Set the Range Calibrator’s RANGE switch to –10 dBm.

15 Verify that the Power Meter displays a reading of –10.00 ±0.04 dBm.

16 Record the actual power reading in the Performance Test Record.

17 Review all of the results for “Test 3”, and mark Pass or Fail for “Test 3” in the

Performance Test Record.

Keysight 53147A/148A/149A Assembly Level Service Guide 41

1 Performance Tests - Verifying Specifications

NOTE

Test 4: Power Reference Oscillator Frequency

The internal power reference oscillator is used to calibrate the Power Meter to the power sensor head. This test verifies that the frequency output of the power reference oscillator is 50.0 MHz ±0.5 MHz.

Equipment Required

Keysight 53150A Microwave Frequency Counter Keysight 10503 Series Coaxial Cables (BNC m to m) Keysight 1250-1535 BNC (f) to Type N (m) Adapter

Power Reference Oscillator Frequency Test

– The instrument and the test equipment must be powered on for at least

30 minutes prior to measuring the power reference oscillator output. This allows the internal temperatures of the equipment to stabilize.

– This procedure specifies the Keysight 53150A for measuring the frequency

output of the 53147A/48A/49A’s power reference oscillator. If the 53147A/ 48A/49A’s Frequency Counter is known to be in calibration (see “Test 1:

Channel 1 Frequency Sensitivity” on page 31), you can use it in place of the

53150A in this procedure.

1 Connect an Keysight E9635A adapter to the Keysight 53147A/48A/49A’s

Power Meter OUTPUT connector as shown in Figure 1-7.

42 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

CHANNEL 1

CHANNEL 2POWERFREQ

POWER

Standby

GHz MHz kHz Hz

Gate

Rel Freq

Rel Pwr

dBm/ W

Channel 2 50 MHz to 20 GHz

DAMAGE

+27 dBm

50 :

1M :

DAMAGE

+30 dBm

10 Hz to 125 MHz

20 GHz Counter

MODIFY

Reset/ Local

HPIB

Pwr Offse

Freq Offse

On/O

Enter

Resol

+/-

Avg

Clear

Rate

Shift

Chan Select

Offse

On/O

Offse

On/O

Display Power

53150A

Ch 12

Rel Freq

Oset

Avg On

Rel Pwr

Oset

dB dBm Watts mW uW %

Ext Rel

Error Shift

Hold

Rate Rmt SRQ

Keysight E9635A Adapter on

Power Reference Oscillator

Output Connector Keysight 53147A/48A/49A

Keysight 53150A/51A/52A Microwave Frequency Counter

Channel 1

Input

NOTE

2 Connect an Keysight 10503 series cable between the Keysight E9635A adapter

on the Keysight 53147A/148A/149A’s Power Meter OUTPUT connector and the CHANNEL 1 input connector on the Keysight 53150A/51A/52A Frequency Counter.

Figure 1-7 Reference Oscillator Frequency Adjustment Setup

3 Set the Keysight 53150A/51A/52A Frequency Counter to measure frequency

on Channel 1.

4 Turn on the Keysight 53147A/48A/49A’s internal power reference oscillator:

Press Shift + Menu, use the up and/or down arrow keys to cycle through the menu to PWR REF, press the right-arrow key, then use the up or down arrow key to change the setting to ON, and press the Enter key. The Pwr Ref annunciator should now be activated.

Keysight 53147A/148A/149A Assembly Level Service Guide 43

The reference oscillator is normally off. It is turned on automatically during calibration and then turned back off when calibration is complete. Setting PWR REF in the 53147A/148A/149A’s menu to ON turns the power reference oscillator on, and it remains on until the PWR REF menu setting is returned to OFF. When you calibrate the Power Meter with PWR REF set to ON, the power reference oscillator remains on after calibration is complete.

5 Record the power reading shown on the Keysight 53150A/51A/52A for “Test

6 Mark Pass or Fail for “Test 4” in the Performance Test Record.

4” in the “Performance Test Record” on page 51.

1 Performance Tests - Verifying Specifications

NOTE

Test 5: Power Meter Reference Level

Two methods for verifying the level of the Power Meter reference signal are provided in this section. Both methods provide acceptable results, and either one can be used.

Power Meter Reference Level: Method 1

Equipment Required

Keysight E4418B Power Meter Keysight 8481A Power Sensor Keysight 11730A Power Sensor Cable (supplied with 53147A/48A/49A)

– To ensure that the test results are valid, the Keysight 53147A/48A/49A and

the test equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– The calibration of the Keysight E4418B Power Meter must be no more than

one level removed from NIST (National Institute of Standards and Technology). If the E4418B Power Meter’s calibration is more than one level removed from NIST, the test results will be invalid.

– This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Connect the Keysight 11730A Power Sensor Cable to the Keysight 8481A

Power Sensor (see Figure 1-8).

Figure 1-8 E4418B Power Meter Zeroing and Calibration Test Setup

44 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

Keysight 53147A/48A/49A

Output connector (with Keysight 8481A

Power Sensor Attached)

Keysight E4418B Power Meter

Input

2 Connect the free end of the Keysight 11730A Power Sensor Cable to the input

connector on the Keysight E4418B Power Meter.

3 Connect the Keysight 8481A Power Sensor to the power reference output

connector of the Keysight E4418B Power Meter.

4 Zero the E4418B Power Meter.

5 Calibrate the E4418B Power Meter.

6 Disconnect the Keysight 8481A Power Sensor from the Keysight E4418B

Power Meter, and immediately connect it to the Power OUTPUT connector on the Keysight 53147A/48A/49A (see Figure 1-9).

Keysight 53147A/148A/149A Assembly Level Service Guide 45

Figure 1-9 Power Meter Reference Level Test Setup

7 Record the power reading shown on the Keysight E4418B Power Meter for

“Test 5” in the “Performance Test Record” on page 51.

8 Mark Pass or Fail for “Test 5” in the Performance Test Record.

1 Performance Tests - Verifying Specifications

NOTE

Power Meter Reference Level: Method 2

Equipment Required

Keysight 432A Power Meter Keysight 478A-H75 or 478A-H76 Thermistor Mount Keysight 34401A Digital Multimeter Keysight 8120-1082 Power Sensor Cable

– To ensure that the test results are valid, the instrument and the test

equipment should be powered on for at least 30 minutes prior to beginning the tests. This allows the internal temperatures of the equipment to stabilize.

– This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Turn the Keysight 432A Power Meter off. Do not turn it on until instructed to do

so.

2 Set the Keysight 34401A Digital Multimeter to measure resistance, and

connect the DVM test prods between the center pin of the V the Keysight 432A Power Meter rear panel and pin 1 on the thermistor-mount

end of the Keysight 8120-1082 Power Sensor Cable (see Figure 1-10 to locate pin 1).

connector on

Figure 1-10 Keysight 8120-1082 Power Sensor Cable End View

3 Round off the resistance reading to two decimal places and keep a record of

this value as R. It is the internal bridge resistance (R) of the Keysight 432A Power Meter (this should be approximately 200.3 ohms).

4 Connect the Keysight 478A-H75 or 478A-H76 Thermistor Mount to the

Keysight 53147A/148A/149A Power Meter OUTPUT connector, as shown in

Figure 1-11.

46 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

NOTE

Keysight 432A

Power Meter

Keysight 53147A/48A/49A

Keysight 34401A Digital Multimeter

COMP

Keysight 478A-H75 or

478A-H76 Thermistor Mount

(connected to Power

Meter OUTPUT connector)

Keysight 8120-1082 Power Sensor Cable

CAUTION

Do not use a cable between the Thermistor Mount and the 53147A/148A/149A Power Meter OUTPUT connector. Connect the Thermistor Mount directly to the OUTPUT connector.

Figure 1-11 Power Meter Reference Level Test Setup

5 Connect the Keysight 8120-1082 Power Sensor Cable between the Thermistor

Mount and the input connector on the Keysight 432A Power Meter.

6 Turn on the 432A Power Meter. Wait 30 minutes for the Power Meter and the

Thermistor Mount to stabilize before proceeding to the next step.

Keysight 53147A/148A/149A Assembly Level Service Guide 47

7 Set the 432A Power Meter’s RANGE switch to Coarse Zero.

8 Adjust the COARSE ZERO control on the 432A Power Meter’s front panel to

9 Set the 432A Power Meter’s RANGE switch to .01 mW / –20 dBm.

10 Press the FINE ZERO switch on the 432A Power Meter’s front panel down to

11 Set the 432A Power Meter’s RANGE switch to 1 mW.

12 Set the Digital Multimeter to measure microvolts.

Ensure that the Keysight 34401A Digital Multimeter’s input leads are isolated from chassis ground before performing the next step.

obtain a zero reading on the meter.

1 Performance Tests - Verifying Specifications

NOTE

13 Connect the positive test prod from the Keysight 34401A Multimeter to

the V

connector on the Keysight 432A Power Meter rear panel.

COMP

The V

and VRF connectors are BNC female. You can use two

COMP

BNC-to-banana jack adapters and two BNC cables to make it easier to connect the Multimeter to the Power Meter.

14 Connect the negative test prod from the Keysight 34401A Digital Multimeter to

the V

connector on the 432A Power Meter’s rear panel.

15 If the reading on the Multimeter is less than 400 microvolts, proceed to step

16. If the reading is 400 microvolts or more, press the FINE ZERO toggle switch on the 432A Power Meter’s front panel down.

16 Observe the reading on the Multimeter, round off the reading to the nearest

microvolt, and keep a record of this value as V

17 Turn on the Keysight 53147A/148A/149A’s internal power reference oscillator:

The reference oscillator is normally off. It is turned on automatically during calibration and then turned back off when calibration is complete. When PWR REF in the 53147A/148A/149A’s menu is set to ON, the power reference oscillator is turned on, and it is left on after calibration.

18 Observe the reading on the Multimeter, and keep a record of this value

as V

19 Disconnect the Multimeter’s negative test lead from the 432A Power Meter’s

connector, and connect it to the 432A Power Meter’s chassis ground.

20 Observe the reading on the Multimeter, and keep a record of this value

COMP

as V

21 Calculate the output level of the 53147A/148A/149A’s power reference

oscillator (P

) using the following formula:

48 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

2 V

( V1 – V0 ) + V

comp

4R (Calibration Factor)

Where:

= Power reference oscillator output level

= previously recorded value

comp

= previously recorded value

R = previously recorded value

Calibration Factor = value for thermistor mount at 50 MHz (traceable to NIST)

– V

Keysight 53147A/148A/149A Assembly Level Service Guide 49

1 Performance Tests - Verifying Specifications

NOTE

R = 200 W

170 μV or 170 x 10

–6

78,107 μV or 78,107 x 10

–6

or .078 V

comp

=5.1583 V

R = previously recorded value

Calibration Factor = 99.68%

2 V

comp

( V1 – V0 ) + V

– V

4R (Calibration Factor)

2 (5.1583) (.078 – 0)

+ (.000170)2 – (0.78)

4(200) (99.68%)

0.80469 – 0.00608 =

0.79861

797.44 797.44

= 1.00147 mW

The following is an example showing how a calculation of the Power Reference Output Level is performed:

50 Keysight 53147A/148A/149A Assembly Level Service Guide

Note that V

is eventually dropped out of the equation in the following steps,

because its value is very small (effectively zero).

22 Verify that P

23 Record the value for P

24 Mark Pass or Fail for “Test 5” in the Performance Test Record.

is between 0.988 mW and 1.012 mW.

in the “Performance Test Record” on page 51.

Performance Tests - Verifying Specifications 1

Performance Test Record (Page 1 of 3)

Keysight 53147A/148A/149A Frequency Counter/Power Meter/DVM

Serial Number: ________________________________________ Test Performed By: ____________________________________ Date: _________________________________________________

Notes: ___________________________________________________________________________________________________________

Pre Calibration Test ❏

Test

Number

1 Power on Self Tests N/A ❏❏

2 10 MHz Test 10,000,000 Hz ❏❏

3 Run Self Test N/A ❏❏

4 10 MHz External Timebase Input Test 2 MHz ❏❏

5 Power Meter Test

6DVM Test

Test

Number

Operational Verification Specifications

Complete

Performance Tests

Channel 1 Frequency Sensitivity ❏❏

10 Hz 30 Hz 1 kHz

500 kHz

5 MHz 10 MHz 20 MHz

Repair/Work Order No.: ________________________________ Temperature: __________________________________________ Relative Humidity: _____________________________________

Post Calibration Test ❏

Test Results

Pass Fail

.02 dB

0 dBm ±

+25 Vdc ±0.25% ±10 mV

(+24.365 Vdc to +25.635 Vdc)

Specifications

10 Hz @ 40 mV rms (–14.9 dBm) 30 Hz @ 40 mV rms (–14.9 dBm) 1 kHz @ 25 mV rms (–19.2 dBm)

500 kHz @ 25 mV rms (–19.2 dBm)

5 MHz @ 25 mV rms (–19.2 dBm) 10 MHz @ 25 mV rms (–19.2 dBm) 20 MHz @ 25 mV rms (–19.2 dBm)

❏❏

Test Results

Pass Fail

_____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________

Channel 1 Frequency Sensitivity ❏❏

50 MHz

125 MHz

50 MHz @ 25 mV rms (–19.2 dBm)

125 MHz @ 25 mV rms (–19.2 dBm)

_____________________ _____________________

Keysight 53147A/148A/149A Assembly Level Service Guide 51

1 Performance Tests - Verifying Specifications

Performance Test Record (Page 2 of 3)

Test

Number

Complete

Performance Tests

Channel 2 Frequency Sensitivity 53147A 53148A 53149A ❏❏

50 MHz 100 MHz 250 MHz 300 MHz 500 MHz

1 GHz

2.5 GHz 5 GHz

10 GHz

12.4 GHz 16 GHz 18 GHz 19 GHz 20 GHz

Channel 2 Frequency Sensitivity 53147A 53148A 53149A ❏❏

22 GHz 24 GHz

26.5 GHz

Channel 2 Frequency Sensitivity 53147A 53148A 53149A ❏❏

30 GHz 34 GHz 40 GHz 42 GHz 44 GHz 46 GHz

–20 dBm

–33 dBm

–29 dBm

N/A N/A N/A

N/A N/A N/A N/A N/A N/A

" "

" " " " " " " "

Specifications

–20 dBm

" "

–33 dBm

" " " " " " " "

–29 dBm

–25 dBm

" "

N/A N/A N/A N/A N/A N/A

–20 dBm

" "

–33 dBm

" " " " " "

–30 dBm

–27 dBm

" "

–23 dBm

" "

–17 dB

" "

Test Results

Pass Fail

_____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________ _____________________

_____________________

_____________________ _____________________ _____________________

___________________

__ _____________________ _____________________ _____________________ _____________________ _____________________

52 Keysight 53147A/148A/149A Assembly Level Service Guide

Performance Tests - Verifying Specifications 1

Performance Test Record (Page 3 of 3)

Test

Number

Complete

Performance Tests

Power Measurement: ❏❏

3 µW 10 µW 30 µW

100 µW 300 µW

1 mW

3 mW 10 mW 30 mW

100 mW

20.00 dBm

–10.00 dBm

Power Reference Frequency:

50.0 MHz _____________________

Power Reference Level:

1.0 mW (0.00 dBm) _____________________

Specifications

± 0.02 dB or ± 0.5%

" " " " " " " "

“ ±0.04 dBm ±0.04 dBm

50.0 MHz ± 1%

(49.5 MHz to 50.5 MHz)

1.0 mW ± 1.2%

0.988 mW to 1.012 mW

Test Results

Pass Fail

❏❏

Keysight 53147A/148A/149A Assembly Level Service Guide 53

1 Performance Tests - Verifying Specifications

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

54 Keysight 53147A/148A/149A Assembly Level Service Guide

Keysight 53147A/148A/149A Microwave Frequency Counter/ Power Meter/DVM

Assembly Level Service Guide

2 Service

Introduction 56 Returning the Instrument to Keysight Technologies for Service 57 Calibration Procedures 59 Pre-Troubleshooting Information 76 Troubleshooting the Instrument 81

2Service

Introduction

This chapter provides service information for your Keysight 53147A/148A/149A. It is divided into four major sections:

– “Returning the Instrument to Keysight Technologies for Service”

(page 57). This section provides you with step-by-step instructions on how to return the instrument for service.

– “Calibration Procedures” (page 59). This section provides step-by-step

procedures for calibrating the Keysight 53147A/148A/149A.

– “Pre-Troubleshooting Information” (page 76). This section provides you with

pertinent information such as safety considerations, recommended test equipment, repair and after-service considerations, and assembly identification and location.

– “Troubleshooting the Instrument” (page 81). This section provides you with

troubleshooting procedures that isolate the faulty assembly or module. Replacement and recalibration of most modules can only be performed at an authorized Keysight Technologies Service Center.

If the instrument is under warranty, return it to Keysight for service. Refer to

“Returning the Instrument to Keysight Technologies for Service” on page 57. If

you decide to troubleshoot the instrument yourself, refer to the section titled

“Troubleshooting the Instrument” on page 81.

56 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

NOTE

Returning the Instrument to Keysight Technologies for Service

Providing Repair Information

Before shipping the instrument to an Keysight Technologies office for service or repair, call the nearest Keysight Sales Office to make arrangements. Then, tag and package the Keysight 53147A/148A/149A for shipment.

ISD (Instrument Service Division) Emergency Response or Express Calibration Service is available for Keysight customers in the USA. If downtime is critical, you can receive your repaired instrument via overnight shipment. Call 800-403-0801, and ask for Emergency Response or Express Calibration Service. When your instrument is repaired, it is returned via overnight shipment at no extra charge.

1 Write the following information on a tag:

– Owner’s name and address

– Instrument model number

– Complete serial number

– Description of service required or failure indications

2 Attach the tag to the instrument.

3 Pack the instrument.

If the original packaging materials are available, use the procedure titled “Packing the Instrument in the Original Packaging Materials.” If the original packaging materials are not available, you can order new packaging materials from an Keysight Sales Office. The new packaging materials are identical to those used by the factory when packaging new instruments. To use commercially available packaging materials, use the procedure titled “Packing the Instrument in Commercially Available Packaging Materials.” Both procedures are on the following page.

Keysight 53147A/148A/149A Assembly Level Service Guide 57

2Service

Packing the Instrument in the Original Packaging Materials

Packing the Instrument in Commercially Available Packaging Materials

To prevent shipping damage, it is best to repack the instrument in its original packaging. In any correspondence, refer to the instrument by the model number and the complete serial number.

1 Disconnect the power cord, probes, cables, or other accessories attached to

the instrument.

2 Make sure the folded corrugated spacer (which normally contains the

manuals) is in the box to ensure proper fitting.

3 Make sure one of the polystyrene blocks is in its proper position in the box.

4 Place the instrument, front panel end first, on the polystyrene block.

5 Place the other polystyrene block on top of the rear end of the instrument to

secure it.

6 Do not return the manuals with the instrument. Return an accessory only when

it is a part of the failure symptoms.

7 Seal the shipping container securely.

If the original factory packaging materials are not available, use the following procedure to pack the instrument in commercially available shipping materials.

1 Wrap the instrument in heavy paper or plastic.

2 Place the instrument in a strong shipping container. Use a double-walled

carton made of at least 350 lb. test material.

3 Protect the control panel with cardboard.

4 Add a layer of shock-absorbing material that is 3 to 4 inches (70 to 100 mm)

thick around all sides of the instrument cushion it and to prevent it from moving within the container

5 Seal the shipping container securely.

6 Mark the shipping container FRAGILE.

58 Keysight 53147A/148A/149A Assembly Level Service Guide

Calibration Procedures

There are four calibration procedures that can be performed outside of an Keysight authorized service facility. The following procedures describe how to calibrate the frequency of the instrument’s timebase, the frequency and output level of the power reference oscillator, and the DVM.

Equipment Required

Table 2-1 lists the test equipment and accessories needed to perform the

calibration procedures in this chapter.

Table 2-1 Recommended Test Equipment and Accessories

Service 2

Instrument Type Required Characteristics

Digital Multimeter 6½ digit AC/DC Keysight 34401A 1

Power Meter Range 1 mW Keysight 432A 1

Power Meter 100 kHz to 110 GHz, –70 dBm to +44 dBm Keysight E4418B 1

Frequency Counter 10 Hz to 125 MHz Keysight 53150A/51A/52A 1

Thermistor Mount

Power Sensor 10 MHz to 18 GHz, -30 dBm to +20 dBm Keysight 8481A 1

Power Sensor Cable 5 ft. Keysight 11730A

Range Calibrator

Serial Cable RS-232, DB-25 to RJ-45 Keysight 53150-60215 1

Precision DC Power Supply + 50 V / – 50 V Keysight 6613C or 6614C 1

Cable BNC (m) to BNC (m) Keysight 10503 series 1

Adapter Type N (m) to BNC (f) Keysight E9635A 1

[a] Equivalent equipment can be substituted for all instruments and accessories.

[b] One supplied with Keysight 53147A/148A/149A

SWR 1.05 at 50 MHz Accuracy ±0.5% at 50 MHz

3, 10, 30, 100, and 300 µW 1, 3, 10, 30, and 100 mW

Model Recommended

Keysight 478A-H75 or 478A-H76

Keysight 11683A 1

[a]

Quantity Required

[b]

Keysight 53147A/148A/149A Assembly Level Service Guide 59

2Service

NOTE

10 MHz Timebase Calibration

Equipment Required

10 MHz Frequency Reference Standard Keysight 11730A Power Sensor Cable (provided with 53147A/148A/149A) Keysight 10503 series BNC (m) to BNC (m) Coaxial Cable Small, non-metallic adjustment tool for slotted screw heads

The instrument and the test equipment must be powered on for at least 30 minutes prior to beginning this calibration procedure. This allows the internal temperatures of the equipment to stabilize.

1 Connect an Keysight 10503 series coaxial cable from the output of your

10 MHz frequency standard to the Counter’s CHANNEL 1 input on the instrument’s front panel.

2 Press the Resol key, and verify that the resolution is set to 1 HZ.

If necessary change the resolution to 1 HZ.

3 If there is a label covering the calibration adjustment access hole,

remove it (see Figure 2-1).

60 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

Calibration Access Hole

Figure 2-1 Calibrating the 10 MHz Frequency Reference Oscillator

4 Insert a non-metallic, slot-type adjustment tool through the hole near the

bottom of the instrument’s left side and into the slot in the timebase calibration screw.

5 Turn the calibration screw clockwise to increase the Counter’s reading or

counter-clockwise to decrease the reading until the frequency value displayed on the Counter’s front panel is exactly 10,000,000 Hz.

Keysight 53147A/148A/149A Assembly Level Service Guide 61

2Service

NOTE

Power Reference Oscillator Frequency Calibration

The internal power reference oscillator is used to calibrate the Power Meter to the power sensor head. This adjustment calibrates the frequency output of the power reference oscillator to 50.0 MHz ±0.5 MHz.

Equipment Required

Keysight 53150A Microwave Frequency Counter Keysight 10503 series BNC (m) to BNC (m) Coaxial Cable Keysight E9635A Type N (m) to BNC (f) Adapter Small, non-metallic adjustment tool for slotted screw heads

– The instrument and the test equipment must be powered on for at least

30 minutes prior to adjusting the power reference oscillator output. This allows the internal temperatures of the equipment to stabilize.

– This procedure specifies the Keysight 53150A for measuring the frequency

output of the 53147A/148A/149A’s power reference oscillator. If the 53147A/ 148A/149A’s Frequency Counter is known to be in calibration (see “Test 1:

Channel 1 Frequency Sensitivity” on page 31), you can use it in place of the

53150A in this procedure.

– Adjusting the power reference oscillator frequency may also affect the output

level of the oscillator. Therefore, after you adjust the frequency to 50.0 MHz ±

0.05 MHz, always check the output level and adjust it, if necessary, as described in “Power Reference Oscillator Level Adjustment” on page 66.

1 Turn off the Keysight 53147A/148A/149A, and disconnect the power cord.

2 Remove the shroud from the Keysight 53147A/148A/149A (see “Removing the

Shroud” on page 96).

3 Position the Keysight 53147A/148A/149A on its right side so that you have

access to the front panel and the left side of the main circuit board (see

Figure 2-2).

62 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

CHANNEL 1

CHANNEL 2POWERFREQ

POWER

Standby

GHz MHz kHz Hz

Gate

Rel Freq

Rel Pwr

dBm/ W

Channel 2 50 MHz to 20 GHz

DAMAGE

+27 dBm

50 :

1M :

DAMAGE

+30 dBm

10 Hz to 125 MHz

20 GHz Counter

MODIFY

Reset/ Local

HPIB

Pwr Offse

Freq Offse

On/O

Enter

Resol

+/-

Avg

Clear

Rate

Shift

Chan Select

Offse

On/O

Offse

On/O

Display Power

53150A

Ch 12

Rel Freq

Oset

Avg On

Rel Pwr

Oset

dB dBm Watts mW uW %

Ext Rel

Error Shift

Hold

Rate Rmt SRQ

Keysight E9635A Adapter on

Power Reference Oscillator

Output Connector

Keysight 53147A/48A/49A

Keysight 53150A/51A/52A Microwave Frequency Counter

Channel 1

Input

WARNING

CAUTION

Figure 2-2 Reference Oscillator Frequency Adjustment Setup

4 Connect the power cord to the Keysight 53147A/148A/149A and to a power

outlet.

Keysight 53147A/148A/149A Assembly Level Service Guide 63

DANGEROUS VOLTAGES ARE PRESENT INSIDE THE KEYSIGHT 53147A/ 148A/149A WHEN IT IS CONNECTED TO A POWER SOURCE. WORK VERY CAREFULLY AND AVOID CONTACT WITH INTERNAL COMPONENTS WHEN THE SHROUD IS REMOVED AND POWER IS APPLIED TO PREVENT INJURY OR DEATH FROM ELECTRICAL SHOCK.

Some internal components of the Keysight 53147A/148A/149A are subject to damage from electrostatic discharge (ESD), physical contact, and/or electrical short circuits. Work very carefully when the shroud is removed, and avoid all unnecessary contact with the internal components.

5 Turn on the Keysight 53147A/148A/149A and then wait for at least 30 minutes

to allow the internal temperature of the instrument to stabilize.

6 Connect an Keysight E9635A adapter to the Power Meter OUTPUT connector as

shown in Figure 2-2.

2Service

NOTE

7 Connect an Keysight 10503 series cable from the Keysight E9635A adapter on

the Keysight 53147A/148A/149A’s Power Meter OUTPUT connector to the CHANNEL 1 input connector on the Keysight 53150A/51A/52A Frequency Counter.

8 Set the Keysight 53150A/51A/52A Frequency Counter to measure frequency

on Channel 1.

9 Turn on the Keysight 53147A/148A/149A’s internal power reference oscillator:

10 Insert a small, non-conductive, slot-type adjustment tool into the hole in the

side of the power reference oscillator shield (see Figure 2-3). This opening allows access to L9, the adjustable inductor that is used to adjust the frequency of the power reference oscillator.

64 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

(Power Adjustment)

(Frequency Adjustment)

Figure 2-3 Power Reference Oscillator Adjustment Locations

11 Set the frequency to 50.0 MHz ± 0.05 MHz (49.95 MHz to 50.05 MHz). Turn the

adjustment tool counter-clockwise to increase the frequency or clockwise to decrease the frequency.

Keysight 53147A/148A/149A Assembly Level Service Guide 65

2Service

NOTE

Keysight E4418B Power Meter

Input

Output connector (with Keysight 8481A

Power Sensor Attached)

Power Reference Oscillator Level Adjustment

Two methods for calibrating the level of the Power Meter reference signal are provided in this section. Both methods provide acceptable results, and either one can be used.

Method 1

Equipment Required

Keysight E4418B Power Meter Keysight 8481A Power Sensor Keysight 11730A Power Sensor Cable (supplied with 53147A/148A/149A)

– To ensure that the results are valid, the Keysight 53147A/148A/149A and the

test equipment should be powered on for at least 30 minutes prior to beginning the calibration procedure. This allows the internal temperatures of the equipment to stabilize.

– The calibration of the Keysight E4418B Power Meter must be no more than

one level removed from NIST (National Institute of Standards and Technology). If the E4418B Power Meter’s calibration is more than one level removed from NIST, the test results will be invalid.

66 Keysight 53147A/148A/149A Assembly Level Service Guide

– This test is appropriate for the Keysight 53147A, 53148A, and 53149A.

1 Connect the Keysight 11730A Power Sensor Cable to the Keysight 8481A

Power Sensor (see Figure 2-4).

Figure 2-4 E4418B Power Meter Zeroing and Calibration Test Setup

Service 2

Keysight 53147A/48A/49A

Output connector (with Keysight 8481A

Power Sensor Attached)

Keysight E4418B Power Meter

Input

2 Connect the free end of the Keysight 11730A Power Sensor Cable to the input

connector on the Keysight E4418B Power Meter.

3 Connect the Keysight 8481A Power Sensor to the power reference output

connector of the Keysight E4418B Power Meter.

4 Zero the E4418B Power Meter.

5 Calibrate the E4418B Power Meter.

6 Disconnect the Keysight 8481A Power Sensor from the Keysight E4418B

Power Meter, and immediately connect it to the Power OUTPUT connector on the Keysight 53147A/148A/149A (see Figure 2-5).

Keysight 53147A/148A/149A Assembly Level Service Guide 67

Figure 2-5 Power Meter Reference Level Test Setup

7 Use a non-metallic, slot-type adjustment tool to adjust the setting of R98 on

the main circuit board (see Figure 2-3) until the power level is as close to

1.000 mW as possible (the level must be between 0.988 mW and 1.012 mW). Turn the adjustment tool counter-clockwise to increase the power level or clockwise to decrease the power level.

2Service

NOTE

Method 2

Equipment Required

Keysight 432A Power Meter Keysight 478A-H75 or 478A-H76 Thermistor Mount Keysight 34401A Digital Multimeter Keysight 8120-1082 Power Sensor Cable

To ensure that the results are valid, the Keysight 53147A/148A/149A and the test equipment should be powered on for at least 30 minutes prior to beginning the calibration procedure. This allows the internal temperatures of the equipment to stabilize.

1 Make sure the Keysight 432A Power Meter is off. Do not turn it on until

instructed to do so.

2 Set the Keysight 34401A Digital Multimeter to measure resistance, and

connect the DVM test prods between the center pin of the V the Keysight 432A Power Meter rear panel and pin 1 on the thermistor-mount

end of the Keysight 8120-1082 Power Sensor Cable (see Figure 2-6 to locate pin 1).

connector on

Figure 2-6 Keysight 8120-1082 Power Sensor Cable End View

3 Round off the resistance reading to two decimal places and keep a record of

this value as R. It is the internal bridge resistance (R) of the Keysight 432A Power Meter (this should be approximately 200.3 ohms).

4 Connect the Keysight 478A-H75 or 478A-H76 Thermistor Mount to the

Keysight 53147A/148A/149A Power Meter OUTPUT connector, as shown in

Figure 2-7.

68 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

NOTE

Keysight 432A

Power Meter

Keysight 53147A/48A/49A

Keysight 34401A Digital Multimeter

COMP

Keysight 478A-H75 or

478A-H76 Thermistor Mount

(connected to Power

Meter OUTPUT connector)

Keysight 8120-1082 Power Sensor Cable

CAUTION

Do not use a cable between the Thermistor Mount and the 53147A/148A/149A Power Meter OUTPUT connector. Connect the Thermistor Mount directly to the

OUTPUT connector.

Figure 2-7 Power Meter Reference Level Calibration Setup

5 Connect the Keysight 8120-1082 Power Sensor Cable between the Thermistor

Mount and the input connector on the Keysight 432A Power Meter.

6 Turn on the 432A Power Meter. Wait 30 minutes for the Power Meter and the

Thermistor Mount to stabilize before proceeding to the next step.

Keysight 53147A/148A/149A Assembly Level Service Guide 69

7 Set the 432A Power Meter’s RANGE switch to Coarse Zero.

8 Adjust the COARSE ZERO control on the 432A Power Meter’s front panel to

9 Set the 432A Power Meter’s RANGE switch to .01 mW / –20 dBm.

10 Press the FINE ZERO control on the 432A Power Meter’s front panel down to

11 Set the 432A Power Meter’s RANGE switch to 1 mW.

12 Set the Digital Multimeter to measure microvolts.

Ensure that the Keysight 34401A Digital Multimeter’s input leads are isolated from chassis ground before performing the next step.

obtain a zero reading on the meter.

2Service

NOTE

13 Connect the positive test prod from the Keysight 34401A Multimeter to the

connector on the Keysight 432A Power Meter rear panel.

COMP

The V

and VRF connectors are BNC female. You can use two

COMP

BNC-to-banana jack adapters and two BNC cables to make it easier to connect the Multimeter to the Power Meter.

14 Connect the negative test prod from the Keysight 34401A Multimeter to the

connector on the 432A Power Meter’s rear panel.

15 If the reading on the Multimeter is less than 400 microvolts, proceed to step

16. If the reading is 400 microvolts or more, press the FINE ZERO toggle switch on the 432A Power Meter’s front panel down.

16 Observe the reading on the Multimeter, round off the reading to the nearest

microvolt, and keep a record of this value as V

17 Turn on the Keysight 53147A/148A/149A’s internal power reference oscillator:

18 Observe the reading on the Multimeter, and keep a record of this value as V

19 Disconnect the Multimeter’s negative test lead from the 432A Power Meter’s

connector, and connect it to the 432A Power Meter’s chassis ground.

20 Observe the reading on the Multimeter, and keep a record of this value

COMP

as V

70 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

21 Calculate the output level of the 53147A/148A/149A’s power reference

oscillator (P

) using the following formula:

2 V

( V1 – V0 ) + V

comp

4R (Calibration Factor)

Where:

= Power reference oscillator output level

= previously recorded value

comp

= previously recorded value

R = previously recorded value

Calibration Factor = value for thermistor mount at 50 MHz (traceable to NIST)

– V

Keysight 53147A/148A/149A Assembly Level Service Guide 71

2Service

NOTE

R = 200 W

170 μV or 170 x 10

–6

78,107 μV or 78,107 x 10

–6

or .078 V

comp

=5.1583 V

R = previously recorded value

Calibration Factor = 99.68%

2 V

comp

( V1 – V0 ) + V

– V

4R (Calibration Factor)

2 (5.1583) (.078 – 0)

+ (.000170)2 – (0.78)

4(200) (99.68%)

0.80469 – 0.00608 =

0.79861

797.44 797.44

= 1.00147 mW

The following is an example showing how a calculation of the Power Reference Output Level is performed:

72 Keysight 53147A/148A/149A Assembly Level Service Guide

Note that V

is eventually dropped out of the equation in the following steps,

because its value is very small (effectively zero).

22 Use a non-metallic, slot-type adjustment tool to adjust the setting of R98 on

the main circuit board (see Figure 2-3) until P

1.012 mW. Turn the adjustment tool counter-clockwise to increase the power level or clockwise to decrease the power level.

is between 0.988 mW and

DVM Calibration

NOTE

The DVM calibration procedure is semi-automatic in that it is accomplished via software embedded in the Keysight 53147A/148A/149A. A computer and an RS-232 serial cable are required to access the calibration software.

Equipment Required

A computer with an RS-232 serial interface and terminal software Keysight 53150-60215 RS-232 Serial Cable Keysight 6613C or 6614C Precision DC Power Supply

To ensure that the results are valid, the Keysight 53147A/148A/149A and the Keysight 6613C/6614C Precision DC Power Supply should be powered on for at least 30 minutes prior to beginning the calibration procedure. This allows the internal temperatures of the equipment to stabilize.

1 Press the Display DVM key on the Keysight 53147A/148A/149A.

2 Connect the DVM test leads to the DVM + and – connectors on the Keysight

53147A/148A/149A (red to + and black to –).

3 Connect the test prods to the + and – output connectors on the Keysight

6613C/6614C Precision DC Power Supply.

4 Set the 6613C/6614C Precision DC Power Supply to output exactly + 50.0 V.

Service 2

5 Connect the Keysight 53150-60215 RS-232 Serial Cable between the

computer’s serial port (DB-25) and the Keysight 53147A/148A/149A’s serial port (RJ-45).

6 Start the terminal software on the computer.

7 Send “!acq 60” from the terminal program to the Keysight 53147A/148A/149A

(be sure to type lowercase letters when typing “!acq 60”).

8 Press “5” on the computer to choose option 5 from the DMM Tests menu (see

Figure 2-8).

Keysight 53147A/148A/149A Assembly Level Service Guide 73

2Service

*********************** DVM TESTS ***********************

Select one of the following DVM tests:

1. Measure Fz - Frequency in Zero Mode

2. Measure Fr - Frequency in Positive Reference Mode

3. Measure Fn - Frequency in Negative Reference Mode

4. Measure Fm - Frequency in Input mode

5. Calculate and Save Calibration Constant.

6. Measure Voltage

7. Set the Gate time: 10ms - 1000 ms.

8. Choose Gated mode

9. Choose Reciprocal mode A. Choose Single Measurement mode. B. Choose Continuous Measurement mode. E. Exit DVM tests.

Choose one of the above? (1 - 9, E) 5

Figure 2-8 DVM Tests Main Menu

9 When the calibration program displays:

Apply 50.000 Volts Reference to the DVM. Ready? (y/n) y

type “y”.

10 When the calibration program displays:

Update from old 10974.12 to new 10974.1 Cal. Constant? (y/n) y

type “y” (the values in the display line above are simulated).

11 When the calibration program displays:

Apply –50.000 Volts Reference to the DVM. Ready? (y/n) y

12 Reverse the connection of the test prods in the + and – output connectors on

74 Keysight 53147A/148A/149A Assembly Level Service Guide

the Keysight 6613C/6614C Precision DC Power Supply (red to – output, black to + output), or reverse the polarity of the power outputs.

13 Type “y”.

14 When the calibration program displays:

Update from old 10974.01 to new 10974.96 Cal. Constant? (y/n) y

type “y” (the values in the display line above are simulated).

Service 2

15 When the calibration program redisplays its menu (as shown in Figure 2-8),

type “e” to exit the program.

16 Close the terminal program and disconnect the serial cable from the computer

and the instrument.

Keysight 53147A/148A/149A Assembly Level Service Guide 75

2Service

WARNING

Pre-Troubleshooting Information

This section contains the following pertinent troubleshooting information:

– Safety Considerations

– Recommended Test Equipment

– Repair Considerations

– After Service Considerations

– Assembly Identification and Location

Safety Considerations

Although this instrument has been designed in accordance with international safety standards, this guide contains information, cautions, and warnings which must be followed to ensure safe operation and to retain the instrument in a safe condition. Service instructions, and adjustment procedures requiring removal of the instrument cover, are for use by service-trained personnel only. To avoid dangerous electric shock, do not perform any servicing or make any adjustments with the cover removed, unless qualified to do so.

BEFORE APPLYING AC POWER, THE INSTRUMENT AND ALL PROTECTIVE EARTH TERMINALS, EXTENSION CORDS, AUTO TRANSFORMERS, AND DEVICES CONNECTED TO THE INSTRUMENT SHOULD BE CONNECTED TO A PROTECTIVE EARTH GROUNDED SOCKET.

ANY INTERRUPTION OF THE PROTECTIVE GROUNDING CONDUCTOR INSIDE OR OUTSIDE THE INSTRUMENT OR DISCONNECTION OF THE PROTECTIVE EARTH TERMINAL WILL CAUSE A POTENTIAL SHOCK HAZARD THAT COULD RESULT IN PERSONAL INJURY. INTENTIONAL INTERRUPTION IS PROHIBITED.

Any maintenance and repair of the opened instrument under voltage should be avoided as much as possible and, if necessary, should be carried out only by a skilled person who is aware of the hazards involved (for example, fire and electric shock).

76 Keysight 53147A/148A/149A Assembly Level Service Guide

Recommended Test Equipment

Test equipment recommended for testing and troubleshooting the Keysight 53147A/148A/149A is listed in Chapter 1, “Performance Tests - Verifying

Specifications”. Substitute equipment may be used if it meets or exceeds the

required characteristics listed in Table 1-1.

Repair Considerations

Electrostatic Discharge

Electronic components and assemblies in the Keysight 53147A/148A/149A can be permanently degraded or damaged by electrostatic discharge. Use the following precautions when servicing the instrument:

1ENSURE that static-sensitive devices or assemblies are serviced at static-safe

work stations providing proper grounding for service personnel.

2ENSURE that static-sensitive devices or assemblies are stored in static

shielding bags or containers.

3DO NOT wear clothing subject to static-charge buildup, such as wool or

synthetic materials.

4DO NOT handle components or assemblies in carpeted areas.

Service 2

5DO NOT remove an assembly or component from its static shielding protection

until you are ready to install it.

6AVOID touching component leads. (Handle by packaging only.)

Surface Mount Repair

None of the assemblies in the instrument that use surface-mount components can be repaired outside of authorized Keysight Service Centers. Any attempt to repair these assemblies voids the Keysight factory warranty.

Disassembly and Reassembly Specifics

Refer to Chapter 3 of this guide, “Replacing Assemblies - Disassembly and

Reassembly” for complete disassembly and reassembly instructions, and Chapter

4, “Replaceable Parts” for an exploded view of the instrument’s parts.

Keysight 53147A/148A/149A Assembly Level Service Guide 77

2Service

WARNING

After Service Considerations

Product Safety Checks

The following safety checks must be performed after any troubleshooting and repair procedures have been completed to ensure the safe operation of the instrument.

THE RESISTANCE CHECKS DESCRIBED IN THE FOLLOWING TEXT REQUIRE THAT THE POWER CORD BE CONNECTED TO THE INSTRUMENT AND THAT AC POWER BE DISCONNECTED. BE SURE THAT THE POWER CORD IS NOT CONNECTED TO AN AC POWER SOURCE BEFORE PERFORMING ANY SAFETY CHECKS.

1 VISUAL INSPECTION. Visually inspect the interior of the instrument

for any signs of abnormal internally generated heat, such as discolored printed circuit boards or components, damaged insulation, or evidence of arcing. Determine and remedy the cause of any such condition.

2 GROUND CONTINUITY TEST. Plug the power cord into the rear- panel power

receptacle. (DO NOT connect the instrument to AC power at this time.) Using a suitable ohmmeter, check resistance from the instrument's metallic connection (such as the rear panel or BNC ground collar) to the ground pin on the power cord plug. The reading must be less than 1Ω. Flex the power cord while making this measurement to determine whether intermittent discontinuities exist.

3 Check any indicated front- or rear-panel ground terminals marked,

using the above procedure.

4 INSULATION RESISTANCE TEST. Tie the line and neutral pins of the power

cord plug together. Measure the resistance from the instrument enclosure (chassis) to the line and neutral pins of the power cord plug. The minimum acceptable resistance is 2 MΩ. Replace any component which results in a failure.

Product Performance Checks

After replacement of any functional assembly, perform the operational verification test in Chapter 1 of this guide, “Performance Tests - Verifying Specifications”

78 Keysight 53147A/148A/149A Assembly Level Service Guide

Assembly Identification and Location

The assembly number, name, and Keysight part number of each of the Keysight 53147A, 53148A, and 53149A assemblies are listed in Table 2-2. Figure 2-9 illustrates the replaceable assemblies in the Keysight 53147A/148A/149A.

Table 2-2 Keysight 53147A/148A/149A Assembly Identification

Assembly Name Keysight Part No.

A1 Adapter (53149A only) 53152-80001

A2 Front Panel Assembly (53147A) A2 Front Panel Assembly (53148A) A2 Front Panel Assembly (53149A)

A3 Front Panel Power Switch Assembly (Power/Standby Switch) 53147-20203

A4 Battery Housing Assembly

A5 DC/DC Converter PCB

A6 Battery Switch Assembly

A7 Battery

[a]

A8 Battery Sled Assembly

A9 Battery Cover Assembly 53150-00003

[a]

Service 2

53147-60207 53148-60207 53149-60207

53150-00002

53150-60004

53147-60223

53150-80010

53150-00004

A10 Power Entry Module Assembly 53147-40007

A11 Rear Panel Assembly 53147-60219

A12 Cooling Fan Assembly 53147-80012

A13 Power Supply Assembly 0950-3299

[a] With Option 002 (Battery Option) only.

Keysight 53147A/148A/149A Assembly Level Service Guide 79

2Service

A11

A10

A13

A12

Figure 2-9 Replaceable Assembly Locations — Top Internal View

80 Keysight 53147A/148A/149A Assembly Level Service Guide

Troubleshooting the Instrument

WARNING

NOTE

Neutral

TB1 (AC In)

Line

Pin 8

TB2 (DC Out)

Pin 1

Approx. location of R23

Power Supply Check

HAZARDOUS VOLTAGES ARE PRESENT ON THE POWER SUPPLY ASSEMBLY. ONLY TRAINED AND QUALIFIED SERVICE PERSONNEL SHOULD PERFORM THE FOLLOWING PROCEDURE.

1 Remove the power cord from the back of the instrument.

2 Remove the cover as described in Chapter 3.

The DC Power Supply Assembly is fused for safety reasons. It must be assumed that, if the fuses are blown, the power supply has probably suffered damage and has therefore become unreliable. If the power supply fails, it must be replaced, even if the fuse in the power supply appears to be all that has failed.

3 Connect the instrument to the power source.

Service 2

4 Connect the negative lead of a voltmeter to the chassis and measure each of

the voltages listed in Table 2-3 on Power Supply connectors TB1 and TB2 (see

Figure 2-10).

Figure 2-10 A4 DC Power Supply Test-Point Locations

Keysight 53147A/148A/149A Assembly Level Service Guide 81

2Service

Table 2-3 lists A4 Power Supply's input and output voltages, the corresponding

wire color for each input and output, and the tolerances specified for these voltages.

Tab le 2-3 A4 Power Supply Inputs and Outputs

Input/Output Voltage Connector and Pin Designation Wire Color Tolerance

AC-input (neutral) 0 VAC

[a]

TB1, pin N blue —

AC-input (line in) 85 - 264 VAC

–15.0 VDC @ 0.7 A max. TB2, pin 1 lavender ±3%

0.0 VDC (ground for –15 VDC) TB2, pin 2 brown —

N/A (unused) TB2, pin position 3 (no pin) N/A —

N/A (unused) TB2, pin 4

+15.0 VDC @ 2 A max. TB2, pin 5 blue ±5%

0.0 VDC (ground for +15 VDC) TB2, pin 6 brown —

+5.0 VDC @ 5A max. TP 13 (bottom of motherboard) red ±1%

0.0 VDC (ground for +5 VDC) TB2, pin 8 black —

[a] AC-input values are referenced to chassis ground.

[a]

TB1, pin L

brown

—

Adjusting the +5 VDC Output

The +5 VDC output of the power supply is adjustable. If this voltage is found to be outside of the tolerance range listed in Table 2-3, it can be adjusted using R23, which is visible on the top surface of the power supply’s circuit board. When adjusting the +5 VDC output, use a nonmetallic or insulated adjustment tool.

82 Keysight 53147A/148A/149A Assembly Level Service Guide

Self-Test

The instrument performs a Self-Test procedure when it is powered on. The Self-Test can also be invoked from the instrument’s Menu.

Running the Self Test

1 Disconnect all cables connected to the instrument’s front and rear signal

2 Connect the power cord to the power input connector on the instrument’s rear

3 Press and release the Power button on the front panel.

4 Observe the front-panel display and note any error messages displayed.

5 When CH 2 NO SIGNAL is displayed, press and release the Shift key,

6 Press the up-arrow key or the down-arrow key repeatedly until DO SELF TEST

7 Observe the front-panel display and note any error messages displayed.

Service 2

connectors.

panel and to an appropriate power source.

and then press and release the Menu key.

is displayed, and then press and release the Enter key.

Self Test Error Messages

Table 2-4 lists and describes messages that are generated by the instrument

during Self-Test to indicate whether a component passed or failed its test. These messages are sent via the RS-232 serial output only—they do not appear on the instrument’s front-panel display.

Keysight 53147A/148A/149A Assembly Level Service Guide 83

2Service

Tab le 2-4 Self-Test Messages

Message Description

ROM TEST FAIL ROM TEST OK

RAM DATA LINES OK RAM DATA ERROR RAM ADDR LINES OK RAM ADDR ERROR RAM TEST OK

ROM failed read test. ROM passed read test.

RAM data lines passed test. RAM data lines failed test. RAM address lines passed test. RAM address lines failed test. RAM tests completed with no errors detected.

EEPROM FAIL - CONFIGURATION DATA

ROM FAIL; Computed checkbyte does not match the value stored in EEPROM.

EEPROM FAIL - CONFIGURATION DATA; Needs to be (re)initialized.

EEPROM FAIL - POWER CAL DATA; Using default data

EEPROM FAIL - SAVED SETTINGS; Using default data

EEPROM FAIL - SAVED SETTINGS; Invalid EEPROM SAV n Data.

GPIB FAIL; Conf. Test The GPIB hardware failed its confidence test.

The configuration data saved in EEPROM memory is defective.

The checksum of the ROM data does not match the value stored in EEPROM.

The EEPROM org code does not verify with current revision of ROM code.

The checksum of the EEPROM power-calibration table is bad. Factory default calibration data will be used.

The checksum of the user settings stored in EEPROM is bad. Factory default settings will be used.

The checksum of one set of user settings (1 – 9) stored in EEPROM is bad.

Table 2-5 and Ta b le 2 - 6 list and describe the messages that are generated by the

instrument during Self-Test or during operation to indicate that a problem has been detected. These messages are displayed on the instrument’s front-panel display and are also sent via the RS-232 serial output (in many cases, the exact message text that is displayed on the front panel is a condensed form of the message that is sent via RS-232).

84 Keysight 53147A/148A/149A Assembly Level Service Guide

Service 2

Table 2-5 Front Panel Display Error Messages

Message Description

12V FAIL The +12 VDC output from the power supply is not within specifications.

–12V FAIL The –12 VDC output from the power supply is not within specifications.

–5V FAIL The –5 VDC output from the power supply is not within specifications.

ADC FAIL Failure detected in the ADC.

PATH FAIL Failure detected in the Channel 1 signal path.

THRS FAIL Failure detected in the Channel 1 threshold circuit.

THRS FAIL Failure detected in the Channel 2 RF threshold circuit.

THRS THRU Failure detected in the Channel 2 through-path threshold circuit.

THRS HET Failure detected in the Channel 2 heterodyne-path threshold circuit.

EEP WRT FAIL Failure detected while writing to EEPROM.

FPANEL FAIL The front panel or its interconnecting cable is defective or not properly connected.

FPGA FAIL Failure detected in the FPGA (Field Programmable Gate Array).

GPIB FAIL Failure detected in the GPIB hardware.

HET PATH FAIL Failure detected in the heterodyne-path circuit.

IIC FAIL An attempt to write to the LCD display failed.

INSTCFG FAIL The instrument’s configuration data is missing or has become corrupted.

OVERTEMP The instrument’s internal temperature is above the acceptable limit.

PWR CAL FAIL The instrument’s power-calibration data is missing or corrupted.

PWR CKT FAIL Failure detected in the Channel 2 power-measurement circuit.

RAM FAIL Failure detected in RAM.

ROM FAIL Failure detected in ROM.

SAV SET FAIL One or more of the sets of user settings is missing or is corrupted.

SERVICE FAIL The instrument’s service data is missing or has become corrupted.

THRU FAIL Failure detected in the through-path circuit of Channel 2.

VCO/CNT FAIL Failure detected in the VCO or the Count Chain.

Keysight 53147A/148A/149A Assembly Level Service Guide 85

2Service

Tab le 2-6 RS-232 Error Messages

Message Description

12V FAIL The +12 VDC output from the power supply is not within specifications.

–12V FAIL The –12 VDC output from the power supply is not within specifications.

–5V FAIL The –5 VDC output from the power supply is not within specifications.

ADC FAIL Failure detected in the ADC.

B1 SIGNAL PATH FAIL Failure detected in the Channel 1 signal path.

B1 THRESHOLD FAIL Failure detected in the Channel 1 threshold circuit.

B2 RF THRESHOLD FAIL Failure detected in the Channel 2 RF threshold circuit.

B2 THROUGH-PATH THRESHOLD FAIL

B2 HETERODYNE PATH THRESHOLD FAIL

EEPROM FAIL - WRITE Failure detected while writing to EEPROM.

FRONT PANEL FAIL The front panel or its interconnecting cable are defective or not properly connected.

FPGA FAIL Failure detected in the FPGA (Field Programmable Gate Array).

GPIB FAIL Failure detected in the GPIB hardware.

HETERODYNE PATH FAIL

IIC FAIL An attempt to write to the LCD display failed.

INSTCFG FAIL The instrument’s configuration data is missing or corrupted.

OVER TEMPERATURE The instrument’s internal temperature is above the limit.

PWR CAL FAIL The instrument’s power-calibration data is missing or corrupted.

POWER METER FAIL Failure detected in the Channel 2 power-measurement circuit.

RAM FAIL Failure detected in RAM.

ROM FAIL Failure detected in ROM.

SAV SET FAIL One or more of the sets of user settings is missing corrupted.

SERVICE FAIL The instrument’s service data is missing or corrupted.

Failure detected in the Channel 2 through-path threshold circuit.

Failure detected in the Channel 2 heterodyne-path threshold circuit.

Failure detected in the heterodyne-path circuit.

86 Keysight 53147A/148A/149A Assembly Level Service Guide

Table 2-6 RS-232 Error Messages (continued)

Message Description

THRU PATH FAIL Failure detected in the through-path circuit of Channel 2.

VCO/COUNT CHAIN FAIL Failure detected in the VCO or the Count Chain.

Service 2

Keysight 53147A/148A/149A Assembly Level Service Guide 87

2Service

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

88 Keysight 53147A/148A/149A Assembly Level Service Guide

Keysight 53147A/148A/149A Microwave Frequency Counter/ Power Meter/DVM

Assembly Level Service Guide

3 Replacing Assemblies -

Disassembly and Reassembly

Introduction 90 Tools Required 91 Do This First 92 Removing the Bumpers 93 Removing the Handle 94 Removing the Bumper Retainers 95 Removing the Shroud 96 Removing the Front Panel Assembly 98 Removing the Rear Panel Assembly 101 Removing the Cooling Fan 103 Removing the Power Supply 104

3 Replacing Assemblies - Disassembly and Reassembly

WARNING

CAUTION

NOTE

Introduction

This chapter provides instructions for removing major assemblies in the Keysight 53147A/148A/149A. To install an assembly, apply the removal instructions in reverse.

The following disassembly and repair procedures are provided:

– “Removing the Bumpers” pg. 93

– “Removing the Handle” pg. 94

– “Removing the Bumper Retainers” pg. 95

– “Removing the Shroud” pg. 96

– “Removing the Front Panel Assembly” pg. 98

– “Removing the Rear Panel Assembly” pg. 101

– “Removing the Cooling Fan” pg. 103

– “Removing the Power Supply” pg. 104

HAZARDOUS VOLTAGES ARE PRESENT ON THE POWER SUPPLY ASSEMBLY. DISCONNECT THE INSTRUMENT FROM THE POWER SOURCE, AND WAIT AT LEAST SIX MINUTES BEFORE WORKING INSIDE THE INSTRUMENT.

Do not replace assemblies when the instrument is operating to prevent damage to components.

Unless otherwise stated, directional referents in the procedures in this chapter are accurate when viewing the instrument from the front.

Part numbers for all replaceable parts and assemblies are provided in Chapter 4,

“Replaceable Parts”.

90 Keysight 53147A/148A/149A Assembly Level Service Guide

Tools Required

The following tools are required for the removal/replacement procedures in this chapter:

– #1 Phillips screwdriver

– #2 Phillips screwdriver

–TORX

– 1/4-inch open-end or box wrench

– 1/4-inch nut driver

– 5/16-inch nut driver

– 7 mm nut driver

– Needle-nose pliers

Replacing Assemblies - Disassembly and Reassembly 3

15 (T15) hand screwdriver

Keysight 53147A/148A/149A Assembly Level Service Guide 91

3 Replacing Assemblies - Disassembly and Reassembly

CAUTION

Do This First

Perform the following steps before beginning any of the removal and replacement procedures:

1 If the instrument is on, press and release the POWER button on the

front panel.

2 Disconnect the AC power cord from the AC input socket on the rear panel.

3 If the instrument has the Battery Option (002) installed, remove the battery

sled, and disconnect any DC input cable from the EXT DC connector on the rear panel.

While most of the hardware used in the instrument is SAE, the six TORX screws that attach the handle mounts to the instrument are metric. To avoid damage to the threaded holes in the chassis that handle mount screws fit in, be sure to use the correct screws.

92 Keysight 53147A/148A/149A Assembly Level Service Guide

Removing the Bumpers

OPTIONS

001 Oven Time Base 002 Battery

Main Power

In or Out

Reference 10 MHz

Auxiliary

AC POWER 90-130 VAC 50/60/400 Hz 190-230 VAC 50/60 Hz

FUSE

1.5A T 250V

WARNING:

To avoid electrical shock: Do not remove covers.

No user serviceable parts inside. Refer all servicing to qualied personnel.

RS-

232

GPIB

Counter/ Power Meter/ DVM

This unit must be earth grounded.

Made in U.S.A.

of domestic and foreign content

POWER METER

POWER

GHz

MHz kHz Hz

20 GHz Counter/Power Meter/DVM

MODIFY

Reset/ Local

Cal Factor

Freq Offse

On/O

Enter

Avg

+ / -

Freq

Clear

Resol

Shift

Ch 12

Rel Freq

Oset Avg On Rel Pwr Oset

dB dBm Watts mW uW %

Ext Rel

Error Shift

Hold

Rate Rmt SRQ

Standby

Counter

Power Meter

DVM

Rate

Pwr Offse

Display Power

dBm/W

Store

Cal

Zero

Oset On/O

Rel Pwr

DVM

–

DAMAGE ±60 VDC

Display DVM

POWER METER

OUTPUT

Power Ref.

1.00mW 50MHz

INPUT

Do NOT Exceed Sensor Max Power

COUNTER

Oset On/O

Rel FreqChan

Select

COUNTER

CHANNEL 1

10 Hz to 125 MHz

DAMAGE +30 dBm

1M:

COUNTER

CHANNEL 2

50MHz to 26.5 GHz

50:

DAMAGE +27 dBm

Gate

NOTE

Use the following procedure to remove the front and rear protective bumpers:

1 Remove the rear bumper by lifting the inner edge of the bumper away from the

shroud near one corner at the top and one side and pulling that corner away from the instrument. Repeat the process with the remaining corners until the bumper is free of the instrument.

Figure 3-1 Removing the Bumpers

2 Use the same procedure (as in Step 1) to remove the front bumper.

The bumpers can be used to support and protect the instrument after the shroud is removed. Place both bumpers on their inner edges on your work surface, and then place the instrument on top of them. The rear bumper can also serve as a holder for the instrument (once the bumper retainers are removed) when you need to position it upright on either end.

Replacing Assemblies - Disassembly and Reassembly 3

Keysight 53147A/148A/149A Assembly Level Service Guide 93

3 Replacing Assemblies - Disassembly and Reassembly

Removing the Handle

Use the following procedure to remove the carrying handle:

1 Remove the front bumper (see “Removing the Bumpers” on page 93).

2 Stand the instrument on end on its back bumper.

3 Position the handle so that it is against the top surface of the shroud

(see Figure 3-2).

Figure 3-2 Removing the Handle

4 Use a T15 TORX screwdriver to remove two of the 8-32 x 1/4-inch handle

mounting screws (remove the two screws that are closest to the back of the instrument).

5 Repeat Step 4 for the other handle mount.

6 While holding the handle to support it, remove the remaining two screws (one

on each handle mount).

7 Remove the handle.

94 Keysight 53147A/148A/149A Assembly Level Service Guide

Replacing Assemblies - Disassembly and Reassembly 3

CAUTION

Removing the Bumper Retainers

Use the following procedure to remove the bumper retainers:

1 Remove the front and rear bumpers (see “Removing the Bumpers” on page

93).

2 Use a #1 Phillips screwdriver to remove the two 4-40 x 7/16-inch flathead

machine screws that attach each bumper retainer to the chassis (see

Figure 3-3).

Figure 3-3 Removing the Bumper Retainers

3 Repeat Step 2 for each bumper retainer you need to remove.

When the all of the bumper-retainer screws and the handle are removed, the shroud is not attached to the chassis. Exercise caution when moving the instrument in this condition to prevent the chassis from sliding out of the shroud. If you do not intend to remove the shroud, insert the bumper retainer screws in the holes they were removed from (the holes are countersunk to accept the screws, and the screws can safely be inserted fully into the holes).

Keysight 53147A/148A/149A Assembly Level Service Guide 95

3 Replacing Assemblies - Disassembly and Reassembly

WARNING

NOTE

Removing the Shroud

Use the following procedure to remove the shroud:

WHEN THE SHROUD IS REMOVED FROM THE COUNTER, DANGEROUS LINE VOLTAGES THAT CAN CAUSE SERIOUS INJURY ARE EXPOSED. ALWAYS DISCONNECT THE POWER CORD BEFORE REMOVING THE SHROUD.

1 Remove all detachable connector fittings and/or adapters from the connectors

on the instrument’s front panel.

2 Remove the front and rear bumpers (see “Removing the Bumpers” on page

93).

3 Remove the handle (see “Removing the Handle” on page 94).

4 Remove the four bumper retainers from the front end of the instrument (see

Figure 3-3 and “Removing the Bumper Retainers” on page 95).

5 Remove the six bumper retainers at the rear end of the chassis.

96 Keysight 53147A/148A/149A Assembly Level Service Guide

Replacing Assemblies - Disassembly and Reassembly 3

6 Slide the shroud off the chassis to the rear (see Figure 3-4), and place it aside

(if the shroud does not slide easily off the chassis, press on the rear panel with one hand while pulling the shroud with the other hand).

Figure 3-4 Removing the Shroud

Keysight 53147A/148A/149A Assembly Level Service Guide 97

3 Replacing Assemblies - Disassembly and Reassembly

CAUTION

Removing the Front Panel Assembly

Use the following procedure to remove the front panel assembly:

1 Remove the shroud (see “Removing the Shroud” on page 96).

2 Use a 5/16-inch wrench to loosen the nut that attaches the Power Meter

output cable to the back of the Power Meter OUTPUT connector on the front panel assembly.

3 Disconnect the Power Meter output cable from the back of the Power Meter

OUTPUT connector.

4 Disengage the Power Meter output cable from the cable clamp on the chassis

floor near the right front corner of the chassis.

5 Disconnect the Power Meter input cable from J22, which is accessible through

the rectangular opening in the chassis floor near the right-front corner of the chassis.

6 Disengage the Power Meter input cable from the cable clamp on the chassis

floor near the right front corner of the chassis.

7 Disconnect the Power Meter INPUT connector’s ground wire (black) from the

ground lug on the chassis floor.

8 Disconnect the Channel 1 input cable from J15, which is accessible through a

hole in the chassis floor that is at the front of the chassis, behind the Chan

Select key.

9 Disconnect the DVM input connector from J23, which is accessible through

the square hole in the chassis floor approximately 1/3 of the way back from the front panel in line with the Display DVM key.

10 Use a microwave torque wrench to partially loosen the nut that connects the

Channel 2 input connector to the sampler on the main circuit board.

Do not attempt to fully loosen the nut at this time. As soon as the nut turns freely, stop turning it, and proceed to the next step.

98 Keysight 53147A/148A/149A Assembly Level Service Guide

Replacing Assemblies - Disassembly and Reassembly 3

11 Remove the two 6-32 x ¼ flathead machine screws from the countersunk

holes at the top-front corners of the chassis (see Figure 3-5).

Figure 3-5 Removing the Front Panel Assembly

12 Remove the five 4-40 x ¼-inch flathead machine screws that attach the

front-panel assembly to the bottom of the chassis.

13 Remove the two 6-32 x ¼-inch flathead machine screws from the countersunk

holes at each side of the front the end of the chassis.

14 While holding the front panel assembly with one hand, use the fingers of your

other hand to continue to loosen the nut on the Channel 2 input connector. Gently pull the front panel assembly away from the chassis as you loosen the nut until the front panel assembly is completely disconnected.

Keysight 53147A/148A/149A Assembly Level Service Guide 99

3 Replacing Assemblies - Disassembly and Reassembly

CAUTION

When reattaching the front panel assembly, reverse the procedure above. You must use a microwave torque wrench to tighten the nut that attaches the Channel 2 input connector to the sampler. Using any other tool to tighten the coupling nut will damage the connector, the sampler, or both.

100 Keysight 53147A/148A/149A Assembly Level Service Guide

Keysight Technologies 53147A, 53149A, 53148A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Figures

List of Tables

Introduction

Operational Verification

Complete Performance Tests

Recommended Calibration Cycle

Test Record

Equipment Required

Operational Verification

Power-On Self Tests

10 MHz Test

Run Self Test

External Timebase Test

Power Meter Test

DVM Test

Complete Performance Tests

Test 1: Channel 1 Frequency Sensitivity

Test 1a: 10 Hz to 20 MHz Frequency Sensitivity

Test 1b: 50 MHz to 125 MHz Frequency Sensitivity

Test 2: Channel 2 Frequency Sensitivity

Test 2a: 50 MHz to 20 GHz Frequency Sensitivity

Test 2b: 22 GHz to 26.5 GHz Frequency Sensitivity

Test 2c: 30 GHz to 46 GHz Frequency Sensitivity

Test 3: Power Measurement

Power Measurement Accuracy Test

Test 4: Power Reference Oscillator Frequency

Power Reference Oscillator Frequency Test

Test 5: Power Meter Reference Level

Power Meter Reference Level: Method 1

Power Meter Reference Level: Method 2

Performance Test Record (Page 1 of 3)

Performance Test Record (Page 2 of 3)

Performance Test Record (Page 3 of 3)

2 Service

Introduction

Returning the Instrument to Keysight Technologies for Service

Providing Repair Information

Packing the Instrument in the Original Packaging Materials

Packing the Instrument in Commercially Available Packaging Materials

Calibration Procedures

Equipment Required

10 MHz Timebase Calibration

Power Reference Oscillator Frequency Calibration

Power Reference Oscillator Level Adjustment

DVM Calibration

Pre-Troubleshooting Information

Safety Considerations

Recommended Test Equipment

Repair Considerations

After Service Considerations

Assembly Identification and Location

Troubleshooting the Instrument

Power Supply Check

Self-Test

Introduction

Tools Required

Do This First

Removing the Bumpers

Removing the Handle

Removing the Bumper Retainers

Removing the Shroud

Removing the Front Panel Assembly