Agilent Technologies 53147A User manual

Agilent 53147A/148A/149A
Microwave Frequency Counter/
Power Meter/DVM
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 Technologies, Inc. 7.C.NL.03.22.01.R1.M.CW6FC
5301 Stevens Creek Boulevard
Santa Clara, California 95052-8059
Copyright Agilent
Technologies, Inc. 2001, 2002
All Rights Reserved.
Reproduction, adaptation, or
translations without prior
written permission is
prohibited, except as allowed
under the copyright laws.
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.
or
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.

Contents
Assembly Level Service Guide iii
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

Contents
iv Assembly Level Service Guide
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

Contents
Assembly Level Service Guide v
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

Contents
vi Assembly Level Service Guide

Assembly Level Service Guide vii
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 peak-
performance operation, and finally, perform all of the performance tests in
Chapter 1 to verify that the instrument is operating to the specifications.

In This Guide
viii Assembly Level Service 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.

In This Guide
Assembly Level Service Guide ix
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.

In This Guide
x Assembly Level Service 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 power-
sensor 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.