Agilent 53147A Service Guide

Assembly Level Service Guide

This guide describes how to service the Agilent 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)

US4048 (53148A) US4049 (53149A)

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

 Copyright Agilent Technologies, Inc. 2001, 2002

Printed: May 2002

Printed in U.S.A.

Manual part number 53147-90010

Certification and Warranty

Certification

Agilent Technologies, Inc. certifies that this product met its published specification at the time of shipment from the factory. Agilent 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.

Warranty

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

Agilent warrants that Agilent 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 Agilent receives notice of such defects during the warranty period, Agilent will replace software media which does not execute its programming instructions due to such defects.

For detailed warranty information, see back matter.

Safety Considerations

General

This product and related documentation must be reviewed for familiarization with this safety markings and instructions before operation.

Before Cleaning

Disconnect the product from operating power before cleaning.

Warning Symbols That May Be Used In This Book

Instruction manual symbol; the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual.

Indicates hazardous voltages.

Indicates earth (ground) terminal.

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

Indicates Alternating current.

Indicates Direct current.

Safety Considerations (cont’d)

WARNING

BODILY INJURY OR DEATH MAY RESULT FROM FAILURE TO HEED A WARNING. DO NOT PROCEED BEYOND A WARNING UNTIL THE INDICATED CONDITIONS ARE FULLY UNDERSTOOD AND MET.

CAUTION

Damage to equipment, or incorrect measurement data, may result from failure to heed a caution. Do not proceed beyond a CAUTION until the indicated conditions are fully understood and met.

Safety Earth Ground

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

WARNING

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.

For additional safety and acoustic noise information, see back matter.

Agilent Technologies, Inc. 7.C.NL.03.22.01.R1.M.CW6FC 5301 Stevens Creek Boulevard Santa Clara, California 95052-8059

Contents

1 Performance Tests

Introduction 1-2

Operational Verification 1-2 Complete Performance Tests 1-3 Recommended Calibration Cycle 1-3

Test Record 1-3 Equipment Required 1-4 Operational Verification 1-6

Power-On Self Tests 1-6

10 MHz Test 1-8

Run Self Test 1-9

External Timebase Test 1-10

Power Meter Test 1-13

DVM Test 1-15 Complete Performance Tests 1-17 Test 1: Channel 1 Frequency Sensitivity 1-18

Test 1a: 10 Hz to 20 MHz Frequency Sensitivity 1-18

Test 1b: 50 MHz to 125 MHz Frequency Sensitivity 1-20 Test 2: Channel 2 Frequency Sensitivity 1-23

Test 2a: 50 MHz to 20 GHz Frequency Sensitivity 1-23

Test 2b: 22 GHz to 26.5 GHz Frequency Sensitivity 1-25

Test 2c: 30 GHz to 46 GHz Frequency Sensitivity 1-26 Test 3: Power Measurement 1-27

Power Measurement Accuracy Test 1-27 Test 4: Power Reference Oscillator Frequency 1-30

Power Reference Oscillator Frequency Test 1-30 Test 5: Power Meter Reference Level 1-32

Power Meter Reference Level: Method 1 1-32

Power Meter Reference Level: Method 2 1-34

Performance Test Record (Page 1 of 3) 1-39

Performance Test Record (Page 2 of 3) 1-40

Performance Test Record (Page 3 of 3) 1-41

Assembly Level Service Guide iii

Contents

2 Service

Introduction 2-2 Returning the Instrument to

Agilent Technologies for Service 2-3

Providing Repair Information 2-3 Packing the Instrument in the Original

Packaging Materials 2-4

Packing the Instrument in Commercially Available

Packaging Materials 2-4

Calibration Procedures 2-6

Equipment Required 2-6 10 MHz Timebase Calibration 2-7 Power Reference Oscillator Frequency Calibration 2-9

Power Reference Oscillator Level Adjustment 2-13

DVM Calibration 2-20

Pre-Troubleshooting Information 2-23

Safety Considerations 2-23 Recommended Test Equipment 2-24 Repair Considerations 2-24

Electrostatic Discharge 2-24 Surface Mount Repair 2-25 Disassembly and Reassembly Specifics 2-25

After Service Considerations 2-25

Product Safety Checks 2-25 Product Performance Checks 2-26

Assembly Identification and Location 2-26

Troubleshooting the Instrument 2-28

Power Supply Check 2-28

Adjusting the +5 VDC Output 2-29

Self-Test 2-30

Running the Self Test 2-30 Self Test Error Messages 2-31

iv Assembly Level Service Guide

Contents

3 Replacing Assemblies

Introduction 3-2 Tools Required 3-3 Do This First 3-3 Removing the Bumpers 3-4 Removing the Handle 3-5 Removing the Bumper Retainers 3-6 Removing the Shroud 3-7 Removing the Front Panel Assembly 3-9 Removing the Rear Panel Assembly 3-11 Removing the Cooling Fan 3-14 Removing the Power Supply 3-15

4 Replaceable Parts

Introduction 4-2 Replaceable Parts 4-2 How To Order A Part 4-3

Contacting Agilent Technologies 4-4 Parts Identification 4-5

Reference Designations 4-5

Cabinet Parts and Hardware 4-5

Accessories and Miscellaneous Items 4-5

5 Backdating

Introduction 5-2

6 Specifications

Introduction 6-2

Measurement Specifications and Characteristics 6-3

A Rack Mounting the Instrument A-2

Index

Assembly Level Service Guide v

Contents

vi Assembly Level Service Guide

In This Guide

This guide provides assembly-level service information for the Agilent 53147A, 53148A, and 53149A.

How to Use This Guide

Repair Strategy

This service guide is designed to isolate failures to the assembly-level only.

The Agilent 53147A/148A/149A instruments can be returned to Agilent for all service work, including troubleshooting, and verifying specifications. Contact your nearest Agilent Sales and Service Office for more details.

NOTE ISD (Instrument Service Division) Emergency Response or Express

Calibration Service is available for Agilent 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.

If you decide to service the instrument yourself, use the troubleshooting procedures in Chapter 2 (Service) and the disassembly and reassembly procedures in Chapter 3 (Replacing Assemblies). Then use the calibration instructions in Chapter 2 to calibrate the instrument for peakperformance operation, and finally, perform all of the performance tests in Chapter 1 to verify that the instrument is operating to the specifications.

Assembly Level Service Guide vii

In This Guide

Instrument Identification

The instrument is identified by the serial number on the rear panel. Agilent uses a two-part serial number with the first part (prefix) identifying a series of instruments and the second part (suffix) identifying a particular instrument within a series. Agilent-assigned alpha characters before the suffix identify the country in which the instrument was manufactured.

Instruments Covered by this Guide

This guide applies directly to Agilent 53147A, 53148A, and 53149A instruments that have the same serial number prefix(es) shown on the title page. If the serial number prefix of your instrument differs from that listed on the title page of this guide, there may be differences between this guide and your instrument.

Instruments having a higher serial prefix are covered (when required) by one or more manual-change sheets included with this guide. If a required change sheet is missing, contact your nearest Agilent Sales Office listed at the back of this guide.

Assembly-Level Service Guide Organization

This Assembly-Level Service Guide consists of a table of contents, a preface, six chapters, and an index. The page headers identify the chapters and sections of this manual. The chapter contents are summarized as follows:

Chapter 1 Performance Tests provides procedures that verify the instrument operates properly and meets the Agilent 53147A/148A/149A specifications given in Chapter 6, “Specifications,” in this guide.

Chapter 2 Service is divided into seven main sections that provide instructions for returning the instrument to Agilent for service, calibrating the instrument, and troubleshooting the assemblies in the instrument.

Chapter 3 Replacing Assemblies provides procedures for replacing defective assemblies and/or modules in the instrument.

viii Assembly Level Service Guide

In This Guide

Chapter 4 Replaceable Parts lists the replaceable parts contained in the instrument, and explains how to order replacement parts for your instrument.

Chapter 5 Backdating contains information required to adapt this manual for older instruments (to be provided when required).

Chapter 6 Specifications lists all the specifications and operating characteristics for the Agilent 53147A/148A/149A.

How to Order Guides

The part number for this guide is listed on the Certification and Warranty page (on the back of the title page) and on the back cover of this guide.

Assembly Level Service Guide ix

In This Guide

Description of the Microwave Frequency Counter/Power Meter/DVM

The Agilent 53147A, 53148A, and 53149A are capable of measuring frequencies from 10 Hz to 125 MHz on Channel 1 and from 50 MHz to 20 GHz (53147A), 26.5 GHz (53148A), and 46 GHz (53149A) on Channel 2. These instruments are also capable of measuring power (the power and frequency ranges for power measurement are dependent on the powersensor model used) and DC voltages up to ±50 VDC. All three instruments have a maximum frequency resolution of 1 Hz.

The Agilent 53147A, 53148A, and 53149A provide GPIB and RS-232 serial interfaces and are suitable for field, bench-top, and ATE operation.

The basic measurement functions of the Agilent 53147A/148A/149A include Frequency, Relative Frequency, Frequency Offset, and Power (including Power Offset and Relative Power). All of these features are accessible from the front panel and over the GPIB and RS-232 interfaces.

The Agilent 53147A/148A/149A includes the following additional measurement functions and features that are designed specifically for manufacturing and service applications:

• 1, 2, 5, and 10 MHz external reference capability

• Optional high-stability oven oscillator for high-accuracy needs and

lengthened calibration cycles

• Frequency and power offset capabilities for relative measurements

• SCPI programming capability

• Battery and dc input option for operation in locations where ac

power is unavailable

• Optional soft carrying case for safe transportation and mobile use

Programmable control is performed via a GPIB or an RS-232 serial interface. The GPIB and RS-232C ports are standard for the Agilent 53147A, 53148A, and 53149A.

x Assembly Level Service Guide

In This Guide

Options

The options available for the Agilent 53147A/148A/149A are listed following this paragraph. Specifications for the options are listed in Chapter 6, “Specifications.” Options ordered with the instrument are installed at the factory and are ready for operation on delivery.

Hardware

• High Stability Oven Timebase, Option 001

• Battery/DC Power Input, Option 002

• Rack Mount Kit, Option 1CM

• Soft Carrying Case, Option 007

Retrofit

Options 001 and 002 can be installed only by authorized Agilent Technologies Repair Centers.

Instructions for installing the Rack Mount Kit are provided in Appendix A.

Assembly Level Service Guide xi

In This Guide

Accessories Supplied and Available

Accessories Supplied

• Power cord, 2.3 meters (Part number dependent upon destination country)

• Power sensor cable (Agilent P/N 11730A)

• DVM test leads (Agilent P/N 34132B)

Accessories Available

• Soft Carrying Case (Agilent P/N 53147-80016)

• Automotive Power Adapter (Agilent P/N 53150-60214)

• Battery (Agilent P/N 53150-80010)

• GPIB Cables (Agilent P/N 10833A/B/C/D)

• RS-232 Cable (Agilent P/N 53150-60215)

• Power Sensors (Agilent 8480 series)

Manuals Supplied

Agilent 53147A/148A/149A Operating and Programming Guide (Agilent P/N 53147-90009)

Agilent 53147A/148A/149A Assembly-Level Service Guide

(Agilent P/N 53147-90010)

xii Assembly Level Service Guide

Performance Tests

Verifying Specifications

Chapter 1 Performance Tests

Introduction

This chapter provides procedures to test the electrical performance of the Agilent 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. 1-2

• Equipment Required pg. 1-4

• Operational Verification pg. 1-6

• Complete Performance Tests pg. 1-17

• Performance Test Record pg. 1-39

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.

1-2 Assembly Level Service Guide

Chapter 1 Performance Tests

Introduction

Complete Performance Tests

The Complete Performance Tests verify the specifications listed in Chapter 6, “Specifications.” All tests can be performed without opening the instrument.

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 Test section in this chapter.

Assembly Level Service Guide 1-3

Chapter 1 Performance Tests

Equipment Required

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

Table 1-1. Recommended Test Equipment and Accessories

Instrument Type Required Characteristics

Synthesized Signal Generator

Microwave Synthesized Signal Generator

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

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

DC Power Supply 25 VDC Agilent E3640A 1 OV

Frequency Counter 10 Hz to 125 MHz Agilent

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

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

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

Thermistor Mount SWR 1.05 at 50 MHz

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

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

Accuracy ±0.5% at 50 MHz

-10

Model Recommended *

Agilent 83650B 1 P, T

53150A/51A/52A

Agilent 478A-H75 or 478A-H76

Quantity Required Use **

1P, C, T

1P, T

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

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

Power Sensor Cable 2.4 mm to 2.4 mm, 5 ft. Agilent 11730A 2

Power Sensor Cable Agilent 8120-1082 1 P, T

Range Calibrator 3, 10, 30, 100, and 300 µW

1, 3, 10, 30, and 100 mW

* Equivalent equipment can be substituted for all instruments and accessories. ** OV = Operational Verification P = Performance Tests C = Calibration T = Troubleshooting † One supplied with Agilent 53147A/48A/49A

Agilent 11683A 1 P

†

P, T

1-4 Assembly Level Service Guide

Chapter 1 Performance Tests

Equipment Required

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

Model

Instrument Type Required Characteristics

20 dB Attenuator DC to 50 GHz

2.4 mm (m) to 2.4 mm (f)

Power Splitter DC to 50 GHz

2.4 mm (f3x)

Cables BNC (m) to BNC (m)

2.4 mm (m) to 2.4 mm (m)

Adapters BNC (f) to Type N (m)

BNC (m) to SMA (f)

3.5 mm (f) to 2.92 mm (m)

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)

Recommended *

Agilent 8490D (Opt. 020)

Agilent 11667C/D 1 P, T

Agilent 10503 series

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

Quantity Required Use **

1P, T

2OV, P,

C, T

1 1 1 1 1 1 1

P, C , T

Assembly Level Service Guide 1-5

Chapter 1 Performance Tests

Operational Verification

If you are not familiar with operating the instrument, you should review the Chapter 1, “Getting Started,” in the Agilent 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

NOTE This test is appropriate for the Agilent 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.

NOTES • 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.

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Chapter 1 Performance Tests

Operational Verification

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-digit hex

number is also displayed).

• 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 1-39, Test 1.

NOTE 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.

Assembly Level Service Guide 1-7

Chapter 1 Performance Tests

Operational Verification

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 1-39, Test 2.

1-8 Assembly Level Service Guide

Chapter 1 Performance Tests

Operational Verification

Run Self Test

NOTE This test is appropriate for the Agilent 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 1-39, Test 3.

Assembly Level Service Guide 1-9

Chapter 1 Performance Tests

Operational Verification

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

NOTES • To ensure that the test results are valid, the instrument and the test

synchronized to an external reference signal.

Equipment Required

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

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 Agilent 53147A, 53148A, and 53149A.

1 Connect an Agilent 10503 series coaxial cable between the output of the

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

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

Channel 1 input connector.

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

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

1-10 Assembly Level Service Guide

Chapter 1 Performance Tests

Operational Verification

To Reference

10 MHz Connector

(Rear Panel)

Agilent 3325A/B Synthesizer

10 MHZ Output

Agilent 53147A/48A/49A

Agilent

Channel 1 (with 10100C 50Ω Feedthrough Attached)

Agilent 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.

Assembly Level Service Guide 1-11

Chapter 1 Performance Tests

Operational Verification

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 1-39.

17 Disconnect the test setup.

1-12 Assembly Level Service Guide

Chapter 1 Performance Tests

Operational Verification

Power Meter Test

This test verifies the accuracy of the Power Meter.

Equipment Required

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

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

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

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

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

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):

Ch 2

Freq

dBm

Pwr

Watts mW uW %

4 If the power sensor head you are using is an Agilent 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.

Assembly Level Service Guide 1-13

Chapter 1 Performance Tests

Operational Verification

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 1-39.

11 Disconnect the test setup.

1-14 Assembly Level Service Guide

Chapter 1 Performance Tests

Operational Verification

DVM Test

This test verifies the accuracy of the DVM.

Equipment Required

Agilent 34401A Digital Multimeter Agilent E3640A DC Power Supply

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

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

2 Set the Agilent 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 Agilent E3640A DC

Power Supply (observe correct polarity).

Agilent E3640A Power Supply

Agilent

Agilent 34401A Digital Multimeter

Agilent

Agilent 53147A/48A/49A

Agilent

Agilent E3640A Power Supply

Agilent

Figure 1-2. DVM Test Setup

Assembly Level Service Guide 1-15

Chapter 1 Performance Tests

Operational Verification

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

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

Be careful not to disturb the voltage setting.

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

the correct polarity).

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

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

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

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

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

reading taken with the Agilent 53147A/48A/49A is within ±0.25% ±10 mV of the reading taken with the Agilent 34401A, mark Pass for Test 6 in the Performance Test Record on page 1-39. If the reading taken with the Agilent 53147A/48A/49A is not within ±0.25% ±10 mV of the reading taken with the Agilent 34401A, mark Fail for Test 6 in the Performance Test Record on page 1-39.

This completes the Operational Verification.

1-16 Assembly Level Service Guide

Chapter 1 Performance Tests

Complete Performance Tests

The Complete Performance Tests verify the specifications of the Agilent 53147A/148A/149A listed in Chapter 6, “Specifications.” All of these tests can be performed without opening the instrument. Table 1-2 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 1-39.

NOTE 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.

Table 1-2. Complete Performance Tests

Page Number Test Description

Page 1-18 Test 1: Channel 1 Frequency Sensitivity

Page 1-23 Test 2: Channel 2 Frequency Sensitivity

Page 1-27 Test 3: Power Measurement

Page 1-30 Test 4: Power Reference Oscillator Frequency

Page 1-32 Test 5: Power Meter Reference Level

NOTE 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.

Assembly Level Service Guide 1-17

Chapter 1 Performance Tests

Test 1: Channel 1 Frequency Sensitivity

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

Equipment Required

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

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

• If the Agilent 3325A/B Synthesizer or the Agilent 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.

1-18 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 1: Channel 1 Frequency Sensitivity

1 Connect an Agilent 10503 Series Coaxial Cable between the reference

output connector on the Agilent 3325A/B Synthesizer and the instrument’s Reference 10MHz connector.

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

CHANNEL 1 connector.

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

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

To Reference Output (Rear Panel)

Agilent 3325A/B Synthesizer

To Reference

Output

(Rear

Agilent 53147A/48A/49A

Agilent

Panel)

Channel 1

Output

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 1-11).

5 Set the output of the Synthesizer to the first frequency specified for

Test 1a in the Performance Test Record on page 1-39 (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 1-39 (–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 1-39.

Assembly Level Service Guide 1-19

Chapter 1 Performance Tests

Test 1: Channel 1 Frequency Sensitivity

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.

NOTES • 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 Agilent 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).

Agilent 83650B Synthesizer

Reference

Output

(Rear Panel)

Agilent 437B Power Meter

Agilent 53147A/48A/49A

Agilent

To Reference 10 MHz

Connector

(Rear Panel)

Agilent

Feedthrough

Channel 1

RF Output

10100C 50

Agilent

1250-2015 BNC to SMA Adapter

8490D 20 dB Attenuator

11904A 2.92 mm to 2.4 mm Adapter

Agilent

11667C

Power Splitter

Agilent

Power Sensor

Input

8487A/D

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

1-20 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 1: Channel 1 Frequency Sensitivity

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

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

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

Agilent 1250-2015 Adapter.

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

Adapter.

5 Connect one of the output connectors on the Agilent 11667C Power

Splitter to the Agilent 8490D Attenuator

6 Connect the Agilent 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 Agilent 11667C Power Splitter.

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

connector on the Agilent 11667C Power Splitter.

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

Sensor and the sensor connector on the Agilent 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 1-11).

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

specified for Test 1b in the Performance Test Record on page 1-39 (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 1-39 (+.8 dBm). (The added 20 dBm compensates for the 20 dB Attenuator.)

Assembly Level Service Guide 1-21

Chapter 1 Performance Tests

Test 1: Channel 1 Frequency Sensitivity

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

the Performance Test Record on page 1-39.

NOTES • Do not disconnect the rest of the test setup, as these connections are

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 Agilent 10100C Feedthrough Terminator, the

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

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).

1-22 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 2: Channel 2 Frequency Sensitivity

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

Equipment Required

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

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

1 Connect the Agilent 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 Agilent 8490D Attenuator to the Agilent 11904D Adapter,

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

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

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

Assembly Level Service Guide 1-23

Chapter 1 Performance Tests

Test 2: Channel 2 Frequency Sensitivity

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.

Agilent 83650B Synthesizer

To Reference

Output

(Rear Panel)

Agilent 53147A/48A/49A

Agilent

To Reference 10 MHz

Connector

(Rear Panel)

Channel 2

RF Output

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

HP 11904D Adapter

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 1-11).

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

specified for Test 2a in the Performance Test Record on page 1-40 (50 MHz).

Agilent 437B Power Meter

Input

HP 11667C Power Splitter

HP 8487A/D Power Sensor

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 1-40 (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 1-40.

1-24 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 2: Channel 2 Frequency Sensitivity

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).

NOTE It may be necessary to repeat Step 5.

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

NOTE This test is appropriate for the Agilent 53148A and 53149A.

1 Use the same test setup as described for Test 2a on page 1-23.

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

specified for Test 2b in the Performance Test Record on page 1-40 (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 1-40 (–5 dBm for the Agilent 53148A; –7 dBm for the Agilent 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 1-40.

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.

Assembly Level Service Guide 1-25

Chapter 1 Performance Tests

Test 2: Channel 2 Frequency Sensitivity

Test 2c: 30 GHz to 46 GHz Frequency Sensitivity

NOTE This test is appropriate for the 53149A only.

1 Use the same test setup as described for Test 2a on page 1-23.

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

specified for Test 2c in the Performance Test Record on page 1-40 (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 1-40 (–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 1-40.

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.

NOTES • 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).

1-26 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 3: Power Measurement

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

Equipment Required

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

Power Measurement Accuracy Test

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

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

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

Agilent 53147A/48A/49A

Agilent

Agilent 11683A

Range Calibrator

Power Input

Output

Figure 1-6. Power Measurement Accuracy Test Setup

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

Assembly Level Service Guide 1-27

Chapter 1 Performance Tests

Test 3: Power Measurement

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

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

NOTE The Range Calibrator output level is adjustable in 5 dB increments.

4 Set the Range Calibrator switches as follows:

FUNCTION: STANDBY POLARITY: NORMAL RANGE: 1 mW LINE: ON

5 Press the Zero key on the Agilent 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 Agilent 53147A, 53148A, or 53149A. Wait for the

Power Meter to complete calibration.

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

1.000 ±0.006 mW.

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 Agilent 53147A, 53148A, or 53149A autoranges properly and that the reading displayed is within the limits shown in the table.

NOTES • 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.

1-28 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 3: Power Measurement

Table 1-3. Range Calibrator Settings and Expected Results

Range Calibrator Agilent 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 1-41.

11 Press the Shift + dBm/W key on the Agilent 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.

Assembly Level Service Guide 1-29

Chapter 1 Performance Tests

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

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

Power Reference Oscillator Frequency Test

NOTES • 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 Agilent 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 1-18), you can use it in place of the 53150A in this procedure.

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

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

2 Connect an Agilent 10503 series cable between the Agilent E9635A

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

1-30 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 4: Power Reference Oscillator Frequency

Agilent E9635A Adapter on Power Reference Oscillator

Output Connector Agilent 53147A/48A/49A

Agilent

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

53150A

Agilent

POWER

Rel Freq

Avg On Rel Pwr

Standby

Freq

Offset

Rate

Reset/ Local

On/Off

Shift

Clear

GHz MHz kHz Hz

Ch 12

Offset

MODIFY

Pwr

HPIB

Offset

Resol

Avg

Enter

+/-

20 GHz Counter

CHANNEL 1

10 Hz to 125 MHz

1M Ω

Ext Rel Rate Rmt SRQ

Error Shift

Gate

Chan Select

Rel Freq

Offset On/Off

Hold

DAMAGE

+30 dBm

CHANNEL 2POWERFREQ

Channel 2 50 MHz to 20 GHz

dBm/ W

DAMAGE

+27 dBm

Display Power

Rel Pwr

Offset On/Off

50 Ω

dB dBm Watts mW uW %

Channel 1

Input

Figure 1-7. Reference Oscillator Frequency Adjustment Setup

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

on Channel 1.

4 Turn on the Agilent 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.

NOTE 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 Agilent 53150A/51A/52A for

Test 4 in the Performance Test Record on page 1-41.

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

Assembly Level Service Guide 1-31

Chapter 1 Performance Tests

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

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

NOTES • To ensure that the test results are valid, the Agilent 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 Agilent 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 Agilent 53147A, 53148A, and 53149A.

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

Power Sensor (see Figure 1-8).

Output connector (with Agilent 8481A

Agilent E4418B Power Meter

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

1-32 Assembly Level Service Guide

Power Sensor Attached)

Input

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

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

input connector on the Agilent E4418B Power Meter.

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

connector of the Agilent E4418B Power Meter.

4 Zero the E4418B Power Meter.

5 Calibrate the E4418B Power Meter.

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

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

Output connector (with Agilent 8481A

Power Sensor Attached)

Agilent 53147A/48A/49A

Agilent

Agilent E4418B Power Meter

Input

Figure 1-9. Power Meter Reference Level Test Setup

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

Test 5 in the Performance Test Record on page 1-41.

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

Assembly Level Service Guide 1-33

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

Power Meter Reference Level: Method 2

Equipment Required

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

NOTES • 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 Agilent 53147A, 53148A, and 53149A.

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

to do so.

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

connect the DVM test prods between the center pin of the V

on the Agilent 432A Power Meter rear panel and pin 1 on the thermistormount end of the Agilent 8120-1082 Power Sensor Cable (see Figure 1-10 to locate pin 1).

connector

Figure 1-10. Agilent 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 Agilent 432A Power Meter (this should be approximately 200.3 ohms).

1-34 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

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

Agilent 53147A/148A/149A Power Meter OUTPUT connector, as shown in Figure 1-11.

NOTE 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.

Agilent 478A-H75 or

478A-H76 Thermistor Mount

(connected to Power

Meter OUTPUT connector)

Agilent 53147A/48A/49A

Agilent

Agilent 8120-1082 Power Sensor Cable

Agilent 432A

Power Meter

COMP

Agilent 34401A Digital Multimeter

Agilent

Figure 1-11. Power Meter Reference Level Test Setup

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

Mount and the input connector on the Agilent 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.

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 obtain a zero reading on the meter.

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 obtain a zero reading on the meter.

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

Assembly Level Service Guide 1-35

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

12 Set the Digital Multimeter to measure microvolts.

CAUTION Ensure that the Agilent 34401A Digital Multimeter’s input leads are

isolated from chassis ground before performing the next step.

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

the V

connector on the Agilent 432A Power Meter rear panel.

COMP

NOTE The V

and VRF connectors are BNC female. You can use two BNC-to-

COMP

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 Agilent 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 Agilent 53147A/148A/149A’s internal power reference

oscillator:

NOTE 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

1-36 Assembly Level Service Guide

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

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

as V

COMP

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

oscillator (P

) using the following formula:

Prf =

2 V

( V1 – V0 ) + V

comp

4R (Calibration Factor)

– V

Where:

= Power reference oscillator output level

comp

= previously recorded value = previously recorded value

= previously recorded value

R = previously recorded value

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

Assembly Level Service Guide 1-37

Chapter 1 Performance Tests

Test 5: Power Meter Reference Level

NOTE The following is an example showing how a calculation of the Power

Reference Output Level is performed:

V0=170 µV or 170 x 10–6 V

= 78,107 µV or 78,107 x 10–6 or .078 V

comp

= 5.1583 V

R = 200

Ω

R = previously recorded value

Calibration Factor = 99.68%

– V

Note that V

Prf =

2 V

is eventually dropped out of the equation in the following

( V1 – V0 ) + V

comp

4R (Calibration Factor)

steps, because its value is very small (effectively zero).

4(200) (99.68%)

0.80469 – 0.00608

2 (5.1583) (.078 – 0)

+ (.000170)2 – (0.78)

0.79861

797.44 797.44

1.00147 mW

22 Verify that Prf is between 0.988 mW and 1.012 mW.

23 Record the value for P

in the Performance Test Record on page 1-41.

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

1-38 Assembly Level Service Guide

Chapter 1 Performance Tests

Performance Test Record (Page 1 of 3)

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

Serial Number: Test Performed By: Date:

Notes: Pre Calibration Test ❏ Post 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 0 dBm ±.02 dB

6 DVM Test +25 Vdc ±0.25% ±10 mV

Test

Number

1a 10 Hz

Operational Verification Specifications

Complete

Performance Tests Specifications

Channel 1 Frequency Sensitivity

30 Hz 1 kHz 500 kHz 5 MHz 10 MHz 20 MHz

Repair/Work Order No. Temperature: Relative Humidity:

(+24.365 Vdc to +25.635 Vdc)

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

❏❏

Test Results Pass Fail

❏❏

Channel 1 Frequency Sensitivity

1b 50 MHz

125 MHz

❏❏

50 MHz @ 25 mV rms (–19.2 dBm)

125 MHz @ 25 mV rms (–19.2 dBm)

Assembly Level Service Guide 1-39

Chapter 1 Performance Tests

Performance Test Record (Page 2 of 3)

Test

Number

Channel 2 Frequency Sensitivity

2a 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

2b 22 GHz

24 GHz

26.5 GHz

Channel 2 Frequency Sensitivity

2c 30 GHz

34 GHz 40 GHz 42 GHz 44 GHz 46 GHz

Complete

Performance Tests Specifications

53147A 53148A 53149A ❏❏

–20 dBm

" "

–33 dBm

" " " " " " " "

–29 dBm

–20 dBm

" "

–33 dBm

" " " " " " " "

–29 dBm

53147A 53148A 53149A ❏❏

N/A N/A N/A

–25 dBm

" "

53147A 53148A 53149A ❏❏

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

–20 dBm

" "

–33 dBm

" " " " " "

–30 dBm

–27 dBm

" "

–23 dBm

" "

–17 dBm

" "

Test Results Pass Fail

1-40 Assembly Level Service Guide

Chapter 1 Performance Tests

Performance Test Record (Page 3 of 3)

Test

Number

Power Measurement:

33 µW

100 µW 300 µW

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)

Complete

Performance Tests Specifications

10 µW 30 µW

1 mW 3 mW

± 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

❏❏

Assembly Level Service Guide 1-41

Chapter 1 Performance Tests

Performance Test Record (Page 3 of 3)

1-42 Assembly Level Service Guide

Service

Chapter 2 Service

Introduction

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

• Returning the Instrument to Agilent Technologies for Service (page 2-3). This section provides you with step-by-step instructions on how to return the instrument for service.

• Calibration Procedures (page 2-6). This section provides step-by-

step procedures for calibrating the Agilent 53147A/148A/149A.

• Pre-Troubleshooting Information (page 2-23). 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 2-28). 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 Agilent Technologies Service Center.

If the instrument is under warranty, return it to Agilent for service. Refer to “Returning the Instrument to Agilent Technologies for Service” on page 2-3. If you decide to troubleshoot the instrument yourself, refer to the section titled “Troubleshooting the Instrument” on page 2-28.

2-2 Assembly Level Service Guide

Chapter 2 Service

Returning the Instrument to Agilent Technologies for Service

Providing Repair Information

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

NOTE ISD (Instrument Service Division) Emergency Response or Express

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 Agilent 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.

Assembly Level Service Guide 2-3

Chapter 2 Service

Returning the Instrument to Agilent Technologies for Service

Packing the Instrument in the Original 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.

2-4 Assembly Level Service Guide

Chapter 2 Service

Returning the Instrument to Agilent Technologies for Service

Packing the Instrument in Commercially Available Packaging Materials

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.

Assembly Level Service Guide 2-5

Chapter 2 Service

Calibration Procedures

There are four calibration procedures that can be performed outside of an Agilent 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

Table 2-1. Recommended Test Equipment and Accessories

calibration procedures in this chapter.

Model

Instrument Type Required Characteristics

Digital Multimeter 6½ digit AC/DC Agilent 34401A 1

Power Meter Range 1 mW Agilent 432A 1

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

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

Thermistor Mount SWR 1.05 at 50 MHz

Accuracy ±0.5% at 50 MHz

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

Power Sensor Cable 5 ft. Agilent 11730A 1

Range Calibrator 3, 10, 30, 100, and 300 µW

1, 3, 10, 30, and 100 mW

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

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

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

Adapter Type N (m) to BNC (f) Agilent E9635A

Recommended *

Agilent 478A-H75 or 478A-H76

Agilent 11683A 1

Quantity Required

†

2-6 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

10 MHz Timebase Calibration

Equipment Required

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

NOTE 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 Agilent 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).

Assembly Level Service Guide 2-7

Chapter 2 Service

Calibration Procedures

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.

2-8 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

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

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

NOTES • 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.

• 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 2-13.

1 Turn off the Agilent 53147A/48A/49A, and disconnect the power cord.

2 Remove the shroud from the Agilent 53147A/48A/49A (see “Removing the

Shroud” on page 3-7).

3 Position the Agilent 53147A/48A/49A 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).

Assembly Level Service Guide 2-9

Chapter 2 Service

Calibration Procedures

Agilent 53147A/48A/49A

Agilent

Agilent E9635A Adapter on Power Reference Oscillator

Output Connector

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

53150A

Agilent

GHz MHz kHz Hz

POWER

Ch 12

Rel Freq

Offset Avg On Rel Pwr

Standby

Freq

Offset

Reset/

Rate

Local

On/Off

Shift

Clear

dB dBm Watts mW uW

Offset

MODIFY

Pwr

HPIB

Offset

Resol

Avg

Enter

+/-

20 GHz Counter

Ext Rel Rate Rmt SRQ

Error Shift

Gate

Chan Select

Rel Freq

Offset On/Off

CHANNEL 1

10 Hz to 125 MHz

Hold

DAMAGE

+30 dBm

CHANNEL 2POWERFREQ

Channel 2 50 MHz to 20 GHz

dBm/ W

DAMAGE

+27 dBm

Display Power

Rel Pwr

Offset On/Off

1M Ω

50 Ω

Channel 1

Figure 2-2. Reference Oscillator Frequency Adjustment Setup

4 Connect the power cord to the Agilent 53147A/48A/49A and to a

power outlet.

WARNING DANGEROUS VOLTAGES ARE PRESENT INSIDE THE AGILENT

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.

CAUTION Some internal components of the Agilent 53147A/48A/49A 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.

2-10 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

5 Turn on the Agilent 53147A/48A/49A and then wait for at least

30 minutes to allow the internal temperature of the instrument to stabilize.

6 Connect an Agilent E9635A adapter to the Power Meter OUTPUT connector

as shown in Figure 2-2.

7 Connect an Agilent 10503 series cable from the Agilent E9635A adapter

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

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

on Channel 1.

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

NOTE The reference oscillator is normally off. It is turned on automatically

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.

Assembly Level Service Guide 2-11

Chapter 2 Service

Calibration Procedures

(Frequency Adjustment)

(Power 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.

2-12 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

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

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

NOTES • To ensure that the results are valid, the Agilent 53147A/48A/49A 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.

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

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

Power Sensor (see Figure 2-4).

Output connector (with Agilent 8481A

Agilent E4418B Power Meter

Power Sensor Attached)

Input

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

Assembly Level Service Guide 2-13

Chapter 2 Service

Calibration Procedures

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

input connector on the Agilent E4418B Power Meter.

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

connector of the Agilent E4418B Power Meter.

4 Zero the E4418B Power Meter.

5 Calibrate the E4418B Power Meter.

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

Power Meter, and immediately connect it to the Power OUTPUT connector

on the Agilent 53147A/48A/49A (see Figure 2-5).

Output connector (with Agilent 8481A

Power Sensor Attached)

Agilent 53147A/48A/49A

Agilent

Agilent E4418B Power Meter

Input

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.

2-14 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

Method 2

Equipment Required

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

NOTE To ensure that the results are valid, the Agilent 53147A/48A/49A 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 Agilent 432A Power Meter is off. Do not turn it on until

instructed to do so.

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

connect the DVM test prods between the center pin of the V

connector

on the Agilent 432A Power Meter rear panel and pin 1 on the thermistormount end of the Agilent 8120-1082 Power Sensor Cable (see Figure 2-6 to locate pin 1).

Figure 2-6. Agilent 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 Agilent 432A Power Meter (this should be approximately 200.3 ohms).

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

Agilent 53147A/148A/149A Power Meter OUTPUT connector, as shown in Figure 2-7.

Assembly Level Service Guide 2-15

Chapter 2 Service

Calibration Procedures

NOTE 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.

Agilent 478A-H75 or

478A-H76 Thermistor Mount

(connected to Power

Meter OUTPUT connector)

Agilent 53147A/48A/49A

Agilent

Agilent 432A

Power Meter

Agilent 34401A

Digital Multimeter

Agilent

COMP

Agilent 8120-1082 Power Sensor Cable

Figure 2-7. Power Meter Reference Level Calibration Setup

5 Connect the Agilent 8120-1082 Power Sensor Cable between the

Thermistor Mount and the input connector on the Agilent 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.

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 obtain a zero reading on the meter.

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 obtain a zero reading on the meter.

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

12 Set the Digital Multimeter to measure microvolts.

2-16 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

CAUTION Ensure that the Agilent 34401A Digital Multimeter’s input leads are

isolated from chassis ground before performing the next step.

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

connector on the Agilent 432A Power Meter rear panel.

COMP

NOTE The V

and VRF connectors are BNC female. You can use two BNC-to-

COMP

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 Agilent 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 Agilent 53147A/148A/149A’s internal power reference oscillator:

NOTE The reference oscillator is normally off. It is turned on automatically

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

as V

Assembly Level Service Guide 2-17

Chapter 2 Service

Calibration Procedures

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

as V

COMP

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

oscillator (P

Where:

) using the following formula:

( V1 – V0 ) + V

comp

4R (Calibration Factor)

comp

Prf =

2 V

= Power reference oscillator output level

= previously recorded value = previously recorded value

= previously recorded value

– V

R = previously recorded value

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

2-18 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

NOTE The following is an example showing how a calculation of the Power

Reference Output Level is performed:

R = 200

Ω

V0=170 µV or 170 x 10–6 V

= 78,107 µV or 78,107 x 10–6 or .078 V

comp

= 5.1583 V

R = previously recorded value

Calibration Factor = 99.68%

– V

Note that V

Prf =

2 V

is eventually dropped out of the equation in the following

( V1 – V0 ) + V

comp

4R (Calibration Factor)

steps, because its value is very small (effectively zero).

4(200) (99.68%)

0.80469 – 0.00608

2 (5.1583) (.078 – 0)

+ (.000170)2 – (0.78)

0.79861

797.44 797.44

1.00147 mW

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

is 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.

Assembly Level Service Guide 2-19

Chapter 2 Service

Calibration Procedures

DVM Calibration

The DVM calibration procedure is semi-automatic in that it is accomplished via software embedded in the Agilent 53147A/48A/49A. 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 Agilent 53150-60215 RS-232 Serial Cable Agilent 6613C or 6614C Precision DC Power Supply

NOTE To ensure that the results are valid, the Agilent 53147A/48A/49A and

the Agilent 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 Agilent 53147A/48A/49A.

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

53147A/48A/49A (red to + and black to –).

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

6613C/6614C Precision DC Power Supply.

4 Set the 6613C/6614C Precision DC Power Supply to output exactly

+ 50.0 V.

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

computer’s serial port (DB-25) and the Agilent 53147A/48A/49A’s serial port (RJ-45).

6 Start the terminal software on the computer.

7 Send “!acq 60” from the terminal program to the Agilent 53147A/48A/49A

(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).

2-20 Assembly Level Service Guide

Chapter 2 Service

Calibration Procedures

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

13 Type “y”.

Assembly Level Service Guide 2-21

Chapter 2 Service

Calibration Procedures

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).

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.

2-22 Assembly Level Service Guide

Chapter 2 Service

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.

WARNING 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.

Assembly Level Service Guide 2-23

Chapter 2 Service

Pre-Troubleshooting Information

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).

Recommended Test Equipment

Test equipment recommended for testing and troubleshooting the Agilent 53147A/148A/149A is listed in Chapter 1, “Performance Tests.” 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 Agilent 53147A/148A/149A can be permanently degraded or damaged by electrostatic discharge. Use the following precautions when servicing the instrument:

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

static-safe work stations providing proper grounding for service personnel.

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

shielding bags or containers.

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

synthetic materials.

4 DO NOT handle components or assemblies in carpeted areas.

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

protection until you are ready to install it.

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

2-24 Assembly Level Service Guide

Chapter 2 Service

Pre-Troubleshooting Information

Surface Mount Repair

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

Disassembly and Reassembly Specifics

Refer to Chapter 3 of this guide, “Replacing Assemblies,” for complete disassembly and reassembly instructions, and Chapter 4, “Replaceable Parts” for an exploded view of the instrument’s parts.

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.

WARNING 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.

Assembly Level Service Guide 2-25

Chapter 2 Service

Pre-Troubleshooting Information

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.”

Assembly Identification and Location

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

Table 2-2. Agilent 53147A/148A/149A Assembly Identification

Assembly Name Agilent 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 * 53150-00002

A5 DC/DC Converter PCB * 53150-60004

A6 Battery Switch Assembly * 53147-60223

A7 Battery * 53150-80010

A8 Battery Sled Assembly * 53150-00004

A9 Battery Cover Assembly 53150-00003

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

* With Option 002 (Battery Option) only.

53147-60207 53148-60207 53149-60207

2-26 Assembly Level Service Guide

Chapter 2 Service

Pre-Troubleshooting Information

A13

A12

A11

A10

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

Assembly Level Service Guide 2-27

Chapter 2 Service

Troubleshooting the Instrument

Power Supply Check

WARNING HAZARDOUS VOLTAGES ARE PRESENT ON THE POWER

SUPPLY ASSEMBLY. ONLY TRAINED AND QUALIFIED SERVICE PERSONNEL SHOULD PERFORM THE FOLLOWING PROCEDURE.

NOTE The DC Power Supply Assembly is fused for safety reasons. It must be

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

2 Remove the cover as described in Chapter 3.

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.

3Connect the instrument to the power source.

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).

Pin 8

Neutral

TB1 (AC In)

Line

TB2 (DC Out)

Pin 1

Approx. location of R23

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

2-28 Assembly Level Service Guide

Chapter 2 Service

Troubleshooting the Instrument

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.

Table 2-3. A4 Power Supply Inputs and Outputs

Input/Output Voltage Connector and Pin Designation Wire Color Tolerance

AC-input (neutral) 0 VAC* TB1, pin N blue —

AC-input (line in) 85 - 264 VAC* TB1, pin L brown —

–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. TB2, pin 7 red ±1%

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

* AC-input values are referenced to chassis ground.

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.

Assembly Level Service Guide 2-29

Chapter 2 Service

Troubleshooting the Instrument

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

connectors.

2 Connect the power cord to the power input connector on the instrument’s

rear panel and to an appropriate power source.

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,

and then press and release the Menu key.

6 Press the up-arrow key or the down-arrow key repeatedly until

DO SELF TEST is displayed, and then press and release the Enter key.

7 Observe the front-panel display and note any error messages displayed.

2-30 Assembly Level Service Guide

Chapter 2 Service

Troubleshooting the Instrument

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.

Table 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

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.

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.

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 powercalibration 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.

Assembly Level Service Guide 2-31

Chapter 2 Service

Troubleshooting the Instrument

Tables 2-5 and 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).

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 FA I L 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.

2-32 Assembly Level Service Guide

Chapter 2 Service

Troubleshooting the Instrument

Table 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 FA IL

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.

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.

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.

Assembly Level Service Guide 2-33

Chapter 2 Service

Troubleshooting the Instrument

2-34 Assembly Level Service Guide

Replacing Assemblies

Disassembly and Reassembly

Chapter 3 Replacing Assemblies

Introduction

This chapter provides instructions for removing major assemblies in the Agilent 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. 3-4

• Removing the Handle pg. 3-5

• Removing the Bumper Retainers pg. 3-6

• Removing the Shroud pg. 3-7

• Removing the Front Panel Assembly pg. 3-8

• Removing the Rear Panel Assembly pg. 3-11

• Removing the Cooling Fan pg. 3-13

• Removing the Power Supply pg. 3-14

WARNING 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.

CAUTION Do not replace assemblies when the instrument is operating to prevent

damage to components.

NOTE 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 5, “Replaceable Parts.”

3-2 Assembly Level Service Guide

Chapter 3 Replacing Assemblies

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

15 (T15) hand screwdriver

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.

CAUTION 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.

Assembly Level Service Guide 3-3

Chapter 3 Replacing Assemblies

Removing the Bumpers

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.

Auxiliary

Reference 10 MHz

WARNING:

90-130 VAC 50/60/400 Hz 190-230 VAC 50/60 Hz

Main Power

In or Out

FUSE

AC POWER

1.5A T 250V

RS-

232

GPIB

To avoid electrical shock:

No user serviceable parts inside. Refer all servicing to qualified personnel.

Do not remove covers.

Counter/ Power Meter/ DVM

Agilent

OPTIONS

001 Oven Time Base 002 Battery

Made in U.S.A.

This unit must be earth grounded.

of domestic and foreign content

20 GHz Counter/Power Meter/DVM

GHz

MHz kHz Hz

POWER

Ch 12

Rel Freq

Offset

Avg On

dBm Watts mW

Rel Pwr

Standby

Offset

MODIFY

Cal

Pwr

Freq

Factor

Offset

Reset/

Avg

Freq

Resol

Local

On/Off

Rate

Enter

+ / -

Clear

Shift

COUNTER

Gate

Offset On/Off

Select

COUNTER

POWER METER

CHANNEL 1

Counter

Power

Ext Rel

Hold

10 Hz to 125 MHz

OUTPUT

Meter

Rate Rmt SRQ

Error

1MΩ

DVM

Shift

POWER METER

DVM

DAMAGE

Power Ref.

+30 dBm

dBm/W

1.00mW 50MHz

Display

Zero

Power

COUNTER

CHANNEL 2

INPUT

Store

Rel Pwr

50MHz to 26.5 GHz

Cal

Offset

Do NOT Exceed

–

DAMAGE

On/Off

Sensor Max Power

+27 dBm

50Ω

DAMAGE

Display

Rel FreqChan

DVM

±60 VDC

Figure 3-1. Removing the Bumpers

2 Use the same procedure (as in Step 1) to remove the front bumper.

NOTE 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.

3-4 Assembly Level Service Guide

Chapter 3 Replacing Assemblies

Removing the Handle

Use the following procedure to remove the carrying handle:

1 Remove the front bumper (see “Removing the Bumpers” on page 3-4).

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.

Assembly Level Service Guide 3-5

Chapter 3 Replacing Assemblies

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 3-4).

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.

CAUTION 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).

3-6 Assembly Level Service Guide

Chapter 3 Replacing Assemblies

Removing the Shroud

Use the following procedure to remove the shroud:

WARNING 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 3-4).

NOTE The bumpers can be used to support and protect the instrument after the

3 Remove the handle (see “Removing the Handle” on page 3-5).

4 Remove the four bumper retainers from the front end of the instrument

(see Figure 3-3 and “Removing the Bumper Retainers” on page 3-6).

5 Remove the six bumper retainers at the rear end of the chassis.

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).

Assembly Level Service Guide 3-7

Chapter 3 Replacing Assemblies

Removing the Front Panel Assembly

Figure 3-4. Removing the Shroud

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 3-7).

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.

3-8 Assembly Level Service Guide

Chapter 3 Replacing Assemblies

Removing the Front Panel Assembly

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.

CAUTION 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.

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).

Assembly Level Service Guide 3-9

Chapter 3 Replacing Assemblies

Removing the Front Panel Assembly

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.

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.

3-10 Assembly Level Service Guide

Chapter 3 Replacing Assemblies

Removing the Rear Panel Assembly

Use the following procedure to remove the rear panel assembly:

1 Remove the shroud (see “Removing the Shroud” on page 3-7).

2 If the Battery Option is not installed, remove the four 4-40 self-locking hex

nuts that attach the battery opening cover to the rear panel (these nuts are accessible from inside the chassis). Remove the battery opening cover, and skip to step 5.

3 If the Battery Option is installed, remove the battery sled from the

Counter (for instructions on removing the battery sled, see Appendix C of the Agilent 53147A/148A/149A Operating Guide).

4 If the Battery Option is installed, remove the four 4-40 x 3/16-inch

self-locking flathead machine screws that attach the rear panel assembly to the Battery Option chassis as shown in Figure 3-6 (two screws on each side of the opening).

Auxiliary

RS-

232

Reference 10 MHz

In or Out

FUSE

1.5A T 250V

No user serviceable parts inside. Refer all servicing to qualified personnel.

OPTIONS

001 Oven Time Base 002 Battery

GPIB

Agilent

Battery

option

screws

This unit must be earth grounded.

Counter/ Power Meter/ DVM

Battery

Battery Charging

EXT DC

11 to 18 VDC

Made in U.S.A.

of domestic and foreign content

Rear panel screws

90-130 VAC 50/60/400 Hz 190-230 VAC 50/60 Hz

WARNING:

AC POWER

Main Power

To avoid electrical shock: Do not remove covers.

Rear panel screws

Figure 3-6. Rear Panel Assembly Screws

5 Remove the nine 4-40 x 3/16-inch self-locking flathead machine screws

that attach the rear panel assembly to the chassis (see Figure 3-6).

NOTE The screw in the lower-left corner of the rear panel assembly (as viewed

from the rear of the Counter) may be covered by the serial-number sticker. If it is, carefully cut away the lower-left corner of the sticker to expose the screw head.

Assembly Level Service Guide 3-11

Chapter 3 Replacing Assemblies

Removing the Rear Panel Assembly

6 Disconnect the external-reference input/output cable (coaxial) from

connector J8 on the main board. J8 is directly under the back edge of the power supply near the chassis wall.

7 A two-wire AC-input cable (brown and blue wires) runs between the

AC input module on the rear-panel assembly and the connector that is accessible through the cutout in the front of the power supply enclosure (TB1). Disconnect this cable from the power supply.

8 If the Battery Option is installed, there is a two-wire cable (brown and

white wires) that runs between the AC input module on the rear panel assembly and connector J3 on the Battery Option circuit board (J3 is the third connector from the back edge of the board). Disconnect this cable from J3 on the Battery Option circuit board.

9 Use a 5/16-inch nut driver to remove the self-locking hex nut that attaches

the rear panel assembly grounding wire (green/yellow) to the right wall of the chassis. Slide the grounding lug off the welded stud on the chassis wall, and thread the lock nut back onto the stud a few turns until it is finger-tight.

10 Use a 7 mm nut driver to remove the two hex standoff screws that attach

the GPIB connector to the rear panel assembly.

WARNING AN ELECTRICAL SHOCK HAZARD EXISTS IF THE COUNTER IS

OPERATED WITH THE REAR PANEL ASSEMBLY GROUNDING WIRE NOT PROPERLY CONNECTED TO THE CHASSIS. TO PREVENT SERIOUS INJURY AND/OR DAMAGE TO THE EQUIPMENT, NEVER OPERATE THE COUNTER UNLESS THIS GROUND WIRE IS SECURELY CONNECTED TO THE CHASSIS WALL AND THE REAR PANEL ASSEMBLY.

11 Carefully pull the rear panel assembly away from the back end of the

chassis. Guide the cables that remain attached to the rear panel assembly as you remove it to prevent them from catching on other cables or other components of the Counter.

CAUTION When reinstalling the rear panel assembly, position it carefully to avoid

damage to the Battery Charging LED, the serial-port connector (RJ-12), the GPIB connector, and the main board. If these components are not correctly aligned with the openings in the back panel, they may be damaged.

3-12 Assembly Level Service Guide

Agilent 53147A Service Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

In This Guide

How to Use This Guide

Options

Accessories Supplied and Available

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)

Introduction

Returning the Instrument to Agilent 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

Method 1

Method 2

DVM Calibration

Pre-Troubleshooting Information

Safety Considerations

Recommended Test Equipment

Repair Considerations

Electrostatic Discharge

Surface Mount Repair

Disassembly and Reassembly Specifics

After Service Considerations

Product Safety Checks

Product Performance Checks

Assembly Identification and Location

Troubleshooting the Instrument

Power Supply Check

Adjusting the +5 VDC Output

Self-Test

Running the Self Test

Self Test Error Messages

Introduction

Tools Required

Do This First

Removing the Bumpers

Removing the Handle

Removing the Bumper Retainers

Removing the Shroud

Removing the Front Panel Assembly

Removing the Rear Panel Assembly