Service Guide
Agilent Technologies
8712ET/ES and 8714ET/ES
RF Network Analyzers
Part No. 08714-90017
Printed in USA
March 2000
Supersedes: October 1999
© Copyright 1998, 1999, 2000 Agilent Technologies
Notice.
Softkey
This information contained in this document is subject to change without notice.
Agilent Techologies makes no warranty of any kind with regard to this material, including but not
limited to, the implied warranties of merchantability and fitness for a particular purpose. Agilent
Techologies shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
Windows is a registered trademark of Microsoft Corporation.
TORX is a registered trademark of TORX Products, division of Camcar/Textron Corporation.
Certification
Agilent Techologies certifies that this product met its published specifications at the time of
shipment from the factory. Agilent Techologies further certifies that its calibration measurements
are tractable to the United States National Institute of Standards and Technology, to the extent
allowed by the Institute’s calibration facility, and to the calibration facilities of other International
Standards Organization members.
Regulatory Information
The regulatory information is in the User’s Guide supplied with the analyzer.
Safety, Warranty, and Assistance
Refer to Chapter 9 for information on safety, warranty, and assistance.
How to Use This Guide
This guide uses the following conventions:
FRONT PANEL KEY
: This indicates a “softkey,” a key whose label is determined by the instruments
firmware, and is displayed on the right side of the instrument’s screen next to the eight
unlabeled keys.
Screen Text: This indicates text displayed on the instrument’s screen.
This guide contains servicing information for the following instruments:
• 8712ET
• 8712ES
: This represents a key physically located on the instrument.
• 8714ET
• 8714ES
iii
8712ET/ES and 8714ET/ES Network Analyzer
Documentation Map
The CDROM provides the contents of all of the documents listed below.
The User’s Guide shows how to make measurements, explains commonly-used
features, and tells you how to get the most performance from the analyzer.
The LAN Interface User’s Guide Supplement shows how to use a local area
network (LAN) for programming and remote operation of the analyzer.
The Automating Measurements User’s Guide Supplement provides
information on how to configure and control test systems for automation of test
processes.
The Programmer’s Guide provides programming information including GPIB
and SCPI command references, as well as short programming examples.
The Example Programs Guide provides a tutorial introduction using
BASIC programming examples to demonstrate the remote operation of
the analyzer.
The Service Guide provides the information needed to adjust, troubleshoot,
repair, and verify analyzer conformance to published specifications.
The HP Instrument BASIC User’s Handbook describes programming and
interfacing techniques using HP Instrument BASIC, and includes a language
reference.
iv
The HP Instrument BASIC User’s Handbook Supplement shows how to use
HP Instrument BASIC to program the analyzer.
The Option 100 Fault Location and Structural Return Loss
Measurements User’s Guide Supplement provides theory and measurement
examples for making fault location and SRL measurements. (Shipped only with
Option 100 analyzers.)
The CATV Quick Start Guide provides abbreviated instructions for testing the
quality of coaxial cables. (Shipped only with Option 100 analyzers.)
The Cellular Antenna Quick Start Guide provides abbreviated instructions
for verifying the performance of cellular antenna systems. (Shipped only with
Option 100 analyzers.)
v
Contents
1. Performance Checks
Performing the Operator's Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Make a Transmission (or S21 and S12) Measurement(s). . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Make a Broadband Power Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
Make a Reflection (or S11 and S22) Measurement with a Cable. . . . . . . . . . . . . . . . . . . . .1-7
Make a Reflection (or S11 and S22) Measurement with a Load . . . . . . . . . . . . . . . . . . . . .1-8
If the Analyzer Fails the Operator’s Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Performance Test Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10
Required Software and Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10
Estimated Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11
Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12
File Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13
Configuration File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-14
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15
Performance Test Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15
Using the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19
Performance Test Notes and Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-23
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-36
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-36
System Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-37
Test Port Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-57
Test Port Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-63
General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-73
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-79
Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-79
Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-80
Data Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-81
Automation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-81
Measurement Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-82
Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-85
2. Adjustments
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Required Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Correction Constants (CCs) Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Frequency Accuracy Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Set Serial Number, Adjustment #100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
LO Power Correction, Adjustment #101. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Switched Gain Correction, Adjustment #102 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
External Detector Gain Correction, Adjustment #103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
Auxiliary Input Correction, Adjustment #111 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Source Power Correction, Adjustment #104. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
B Amplitude Correction, Adjustment #105. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18
Reflection (One-Port) Correction, Adjustment #107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-19
Transmission Correction, Adjustment #106. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-20
B* Amplitude Correction, Adjustment #110. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-21
R* Amplitude Correction, Adjustment #108. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23
R* Frequency Response Correction, Adjustment #109 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25
Contents-vii
Contents
3. Assembly Replacement
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Assembly Removal/Replacement Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
A1 Front Panel Assembly Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Removing the Front Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Installing the Front Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
A2 CPU Board Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Removing the CPU Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Installing the CPU Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
A3 Fractional-N/Reference Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Removing the Fractional-N/Reference Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Installing the Fractional-N/Reference Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
A4 Source Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Removing the Source Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Installing the Source Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
A5 Receiver Assembly Component Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Removing the Receiver Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Installing the Receiver Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
A6 Power Supply Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Removing the Power Supply Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Installing the Power Supply Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
A7 Display Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Removing the Display Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
A8 Internal Disk Drive Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Removing the 3.5" Disk Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Installing the 3.5" Disk Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Post Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
How to Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Save Money by Ordering R-E (Rebuilt-Exchange) Assemblies . . . . . . . . . . . . . . . . . . . . . 3-24
4.Troubleshooting and Block Diagrams
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
General Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Service Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Initial Observations — Normal Power-up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Operator's Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Category 1 Failures: Dead or No Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Troubleshooting the Power Supply Assembly (A6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Troubleshooting Digital Group Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Error Occurs During DSP Initialization or Calculating Coefficients . . . . . . . . . . . . . . . . 4-16
Front Panel Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17
Other Power-Up Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Other Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Category 2 Failures: No Error Messages but One or More Measurements Are
Nonfunctional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Category 2 (ET Analyzer Troubleshooting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Category 2 (ES Analyzer Troubleshooting). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
General Troubleshooting for Both ET and ES Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Contents-viii
Contents
Category 3 Failures: Inaccurate (but reasonably functional) Measurements. . . . . . . . . . . .4-33
Troubleshooting Inaccurate Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-33
RF Power Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-37
Category 4 Failures: Peripheral Device Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-38
DIN Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-38
RS-232 Printers and Plotters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-38
Floppy Disk Drive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-38
Centronics (Parallel) Printers and Plotters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-39
GPIB Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-39
LAN Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-40
5. Service Related Menus
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Tests and Adjustments Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
Select Self-Test Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Select Adjustment Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Instrument Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10
Update Corr Const Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11
Service Utilities Menu 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-12
Meas Cal Options Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15
Analog Bus Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16
Service Utilities Menu 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-19
Service Utilities Menu 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20
View Array Master Menu /View Array Interpol Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21
Miscellaneous Service Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22
Clearing Nonvolatile Memory (SRAM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22
GPIB Command Reference for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23
Syntax Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23
Softkey SCPI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23
Alphabetical SCPI Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24
6. Theory of Operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
System Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
The Analyzer Functional Groups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Power Supply (A6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Digital Control Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Source Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
Receiver Assembly (A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12
7. Parts List
Analyzer Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Specific Assembly and Cable Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
8. Correction Constants and Firmware
Storing and Recalling Correction Constants (CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Storing Correction Constants to Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Loading Correction Constants from Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Contents-ix
Contents
Storing Correction Constants to EPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Installing Correction Constants from Disk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
In Case of Difficulties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Upgrading or Re-Installing Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
How to Upgrade or Re-Install the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5
9. Safety, Warranty, and Assistance
Safety Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
General Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Lithium Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
Shipment for Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
Contents-x
8712ET/ES and 8714ET/ES
RF Network Analyzers
1 Performance Checks
Service Guide 1-1
Performance Checks 8712ET/ES and 8714ET/ES
RF Network Analyzers
This chapter is divided into three parts:
• “Performing the Operator's Check” on page 1-3
• “Performance Test Software” on page 1-10
• “Specifications” on page 1-36
The operator's check can be used as a quick 80% confidence test. The only equipment
required for this check is a type-N cable and a good quality 50Ω type-N load (75Ω for
Option 1EC analyzers).
The performance tests will verify that the analyzer meets its published specifications with
greater than a 95% confidence level. The performance tests require an external controller
running HP BASIC and are completely automated.
The specifications provide a complete definition of the warranted and non-warranted
characteristics of the analyzer.
1-2 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performing the Operator's Check
Performing the Operator's Check
The operator's check should be performed when you receive your instrument, and any time
you wish to have confidence that the analyzer is working properly. The operator's check
does not verify conformance to specifications, but should give you a high degree of
confidence that the instrument is performing properly if it passes.
The operator's check consists of making the following measurements with the cable that
was supplied with your analyzer:
8712ET/8714ET 8712ES/8714ES
transmission S21 and S
broadband power broadband power
reflection S11 and S
reflection
1.with a 50Ω or 75Ω load, instead of the cable
1
S11 and S
12
22
22
1
Equipment List
To perform the operator's check, you will need the following:
• A known good cable suc h as the one that was supplied with your analyzer. The cable you
use should have ≤0.5 dB of insertion loss up to 1.3 GHz, and ≤0.75 dB of insertion loss
from 1.3 to 3.0 GHz.
• A known good load (>40 dB return loss) that matches the test port impedance of your
analyzer such as one from calibration kit HP/Agilent 85032B/E (50Ω) or HP/Agilent
85036B/E (75Ω).
NOTE The illustrations depicting the analyzer’s display in this section were made
using an 8714ET. Other models’ displays will have minor differences in
annotation.
Service Guide 1-3
Performance Checks 8712ET/ES and 8714ET/ES
Enter
dBm
Default Response
Performing the Operator's Check RF Network Analyzers
Make a Transmission (or S21 and S12) Measurement(s)
1. Connect the equipment as shown in Figure 1-1. Use a known good cable such as the one
that was supplied with your analyzer.
NOTE The quality of the cable will affect these measurements; make sure you
use a cable with the characteristics described in “Equipment List” on
page 1-3.
Figure 1-1 Equipment Setup for Performing the Operator’s Check
2. Press .
3. Press .
4. Press .
PRESET SCALE .1
POWER 0
CAL
5. Verify that the data trace falls within ±0.5 dB of 0 dB. See Figure 1-2 for a typical 8714
result. The 8712 should look similar, but will end at 1300 MHz.
1-4 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
S12 Rev Trans
Default Response
RF Network Analyzers Performing the Operator's Check
Figure 1-2 Verify Transmission (or S
and S12) Measurement
21
Perform the following steps on ES model analyzers only.
6. Press .
7. Press .
MEAS 1
CAL
8. Verify again that the data trace falls within ±0.5 dB of 0 dB. See Figure 1-2.
Service Guide 1-5
Performance Checks 8712ET/ES and 8714ET/ES
Power
More
Power
Start
MHz
Enter
dBm
Performing the Operator's Check RF Network Analyzers
Make a Broadband Power Measurement
1. Leave the cable connected to the analyzer as shown in Figure 1-1.
NOTE The quality of the cable will affect these measurements; make sure you use a
cable with the characteristics described in “Equipment List” on page 1-3.
2.
Press .
3. If is not displayed, press .
MEAS 1
4. Press .
5. Press .
POWER 0
FREQ
10
SCALE 1
6. Verify that the data trace is within ±2 dB of 0 dBm. See Figure 1-3 for a typical 8714
result. The 8712 should look similar, but will end at 1300 MHz.
Figure 1-3 Verify Broadband Power Measurement
1-6 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
S11 Refl Port1
Reflection
Enter
dBm
Default 1-Port
S22 Refl Port2
Default 1-Port
RF Network Analyzers Performing the Operator's Check
Make a Reflection (or S11 and S22) Measurement with a Cable
1. Leave the cable connected to the analyzer as shown in Figure 1-1.
NOTE The quality of the cable will affect these measurements; make sure you use a
cable with the characteristics described in “Equipment List” on page 1-3.
2.
Press .
3. For ES models, press .
For ET models, press .
PRESET MEAS 1
4. Press .
5. Press .
6. Press .
SCALE 10
POWER 0
CAL
7. Verify that the data trace falls completely below −16 dB. See Figure 1-4 for a typical
8714 result. The 8712 should look similar, but will end at 1300 MHz.
Figure 1-4
Verify Reflection (or S11 and S22) Measurement
Perform the following steps on ES model analyzers only.
8. Press .
9. Press .
MEAS 1
CAL
10.Verify again that the data trace falls completely below −16 dB. See Figure 1-4.
Service Guide 1-7
Performance Checks 8712ET/ES and 8714ET/ES
S11 Refl Port1
Reference Level
S22 Refl Port2
Reference Level
Performing the Operator's Check RF Network Analyzers
Make a Reflection (or S11 and S22) Measurement with a Load
1. Disconnect the cable and connect a known good load to the RF OUT/PORT 1 test port as
shown in Figure 1-5.
Figure 1-5 Connect the Load
2. For ES models, press .
Verify that the data trace falls below −30 dB. If the data trace is off the screen, press
3.
MEAS 1
SCALE
and the key until the trace moves up onto the screen.
Perform the remaining steps on ES model analyzers only.
4. Disconnect the load from PORT 1 and connect it to PORT 2 as shown in Figure 1-6.
Figure 1-6 Connect the Load to Port 2 (ES Models only)
5. Press .
6. Verify that the data trace falls below −30 dB. If the data trace is off the screen, press
1-8 Service Guide
SCALE
MEAS 1
and the key until the trace moves up onto the screen.
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performing the Operator's Check
This concludes the operator's check. However, further confidence can be obtained by
performing the following:
•Measure a known filter to verify that its measured response is the same as is expected.
(A 175 MHz filter is supplied with the analyzer.) Verify both the frequency accuracy and
noise floor.
•Check broadband response with the filter using conversion-loss mode (same as B*/R*).
•If the analyzer's frequency accuracy is critical for your application, verify a CW
frequency using a frequency counter. Verify to±.005% accuracy (for example,± 2500 Hz
at 500 MHz). Ensure that the analyzer is placed in trigger-hold mode (press
Trigger Hold
) to measure frequencies.
MENU
If the Analyzer Fails the Operator’s Check
First, repeat the operator's check using a different cable and load to eliminate these as a
possible cause of failure. Second, if the floppy disk from the factory labeled “Correction
Constants” is available, reload the “Correction Constants” (CCs) perChapter 8,
“Correction Constants and Firmware.” (The floppy disk was shipped with the instrument
from the factory.) Then repeat the Operator’s Check.
If your analyzer does not meet the criteria in the operator's check, your analyzer may need
adjustment or servicing. Contact any Agilent Technologies sales or service office for
assistance. Refer toTable 9-1on page9-7 for the nearest office. Before shipping your
analyzer, fill out and attach the blue repair tag, located at the back of this manual.
Service Guide 1-9
Performance Checks 8712ET/ES and 8714ET/ES
PRINT RESULTS
Performance Test Software RF Network Analyzers
Performance Test Software
The performance test software provides automated tests for verifying that the analyzer
meets its published specifications with greater than a 95% confidence level. The
performance test software must be run on an external controller running HP BASIC (the
analyzer’s internal IBASIC cannot be used). The performance tests can be considered a
check of the overall calibration of the instrument. Unlike the adjustments described in
Chapter 2, the performance test software only checks the performance of the analyzer. No
changes are made to the calibration constants stored in the instrument. When a
performance test fails, usually one or more adjustments should be performed to attempt to
improve the performance before repairing or replacing hardware.
Results of the automated performance tests can be printed out at any time. They include
all specifications, limits, and uncertainties . Although no manual tests are provided, each of
the automated tests is described in enough detail to allow a knowledgeable technician to
perform all needed tests in an accurate manner. See “Performance Test Notes and
Descriptions” on page 1-23.
The printed test results list uncertainties for each measurement. These uncertainties are
for reference only, and are not taken into consideration when making pass/fail
determinations. The listed uncertainties do not depend on the level of the measured signal;
they assume a signal at the specified level. Generally, uncertainties assume published
specifications for all instruments and devices. For the 110 dB step attenuator and the
20 dB fixed attenuator, device-specific calibration data is required.
Performance test record cards are not provided; the printed results of the automated
performance testing serve as the test record for this product. See “ ” in
“Using the Program” on page 1-19 for details on pass/fail indications for individual tests.
When a test report contains no “FAIL” indicators, an analyzer is considered to have passed
the performance tests.
Many instrument users require a periodic, documented check of instrument performance.
This is usually referred to as a “periodic calibration.” Successful completion of the
performance tests (no “FAIL” indicators) should suffice for the requirements of a periodic
calibration. Do not confuse the term “periodic calibration” with the terms “user
calibration” or “default calibration” which both refer to measurement calibrations utilized
by operators when measuring devices with the analyzer.
Required Software and Controller
The performance test software is written for an HP 9000 Series 200, 300, or 700
workstation (or equivalent), running HP BASIC 5.1 or greater. There is also a version
available to run on a PC under HP BASIC for Windows with a GPIB interface card.
Operation is essentially identical to that described for an HP workstation computer.
1-10 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performance Test Software
NOTE To order the performance test software, contact the nearest Agilent
Technologies sales or service office listed inTable 9-1on page9-7. The
workstation version is HP part number 08714-10001 (LIF format). The PC
version is HP part number 08714-10002 (DOS format), and requires HP
BASIC for Windows (HP model number E2060B), and a GPIB interface card.
The performance test software automates all the performance verification tests for the
8712ET/ES and the 8714ET/ES. It will test all option combinations, including both 50Ω
and 75Ω versions.
NOTE This program cannot be used to test an HP/Agilent 8711A, any HP/Agilent
871xB, or any HP/Agilent871xC. To test an HP/Agilent 8711A, order HP part
number 08711-10011. To test an HP/Agilent 871xB, order HP part number
08712-10011. Both of these programs are in LIF format only. To test an
HP/Agilent 871xC, order HP part number 08712-10017 (LIF format) or
08712-10018 (DOS format).
NOTE All the data files and configuration files used in this program are compatible
with the previous 871xB and 871xC versions of this program. It is not
necessary to regenerate or modify any of these files. If you are adding this
program to the same directory as the 871xB/C software, only the main
program file (CAL871XE) need be transferred.
The performance test software is provided on a single disk. You can run the program
directly from the disk, although it is recommended that you run it from your system's hard
disk for best performance. Generally, the program can be stopped, reset and re-run with
little or no loss of data. The LIF version program will operate on a LIF-based system, or an
SRM/HFS environment. The DOS version is limited to DOS environments.
Operation is a simple menu driven system with some softkey selections. For ease of use,
the / / keys on your computer’s keyboard can always be used as
Return Enter Execute
softkey #1—the most frequently used key.
NOTE All necessary instructions and test setup diagrams are contained within the
program.
A disk file is generated for each analyzer, and the results of each test are stored in that file.
This file is updated after each test so that results will not be accidentally lost. A printout
can be obtained for any previously tested analyzer.
Estimated Time
Before running the performance tests, turn on the analyzer and allow it to warm up for one
hour. Performance test times are kept to a minimum, allowing analyzers to be fully tested
within one to two hours after the initial warmup.
Service Guide 1-11
Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
Equipment
In addition to a computer, printer, RF cables, BNC cables, GPIB cables, and adapters,
Table 1-1 lists the equipment that is required to test and adjust the analyzer.
Table 1-1 Required Equipment for Performance Tests
Description HP/Agilent Model #
Function generator 8116A or 33120A
Power meter
Power sensor, 50Ω 8482A
Power sensor, 75Ω 8483A
Cal kit type-N 50Ω 85032B Opt 001
Cal kit type-N 75Ω 85036B
External 110 dB step
attenuator
Attenuator/switch driver 11713A ✓✓
Spectrum analyzer 8560 series,
20 dB attenuator 50Ω
20 dB attenuator 75Ω
6 dB attenuator 50Ω
3 dB attenuator 50Ω 8491A/B/C Opt 003
3 dB attenuator 75Ω
Power splitter, 50Ω
Power splitter, 75Ω
Minimum loss pad
(quantity: 2)
Precision cable 50Ω 8120-8862 or 8120-6469
Precision cable 75Ω 8120-8898 or 8120-6468
437B, 438A
E4418A or E4419A
1
8496A/G ✓✓
8566B
8491A/B/C Opt 020 ✓ —
3
0955-0768 — ✓
8491A/B/C Opt 006 ✓ —
0955-0765 — ✓
0955-0751,11667A ✓ —
0955-0752 — ✓
11852B — ✓
50Ω
STD
75Ω
✓✓
✓✓
✓✓
— ✓
✓ —
— ✓
✓✓
✓ —
✓ —
— ✓
No substitute. (The 8116A is
preferred.)
Do not use an 436A.
Needed only if using an 8496G
programmable 110 dB step
attenuator.
Others may be substituted.
Notes
2
1. An 85032B Option 001 is a subset of the standard 85032B. This option eliminates four 7-mm adapters
that are not needed, resulting in a significant cost savings.
2. The spectrum analyzer used must be compatible with the 8566B , both in the GPIB commands for the
basic remote control functions and in frequency accuracy. Any of the 856x series is acceptable, the
8560E is the least expensive. The 859x series is not acceptable because of the marginal frequency
accuracy.
3. The 75Ω 20 dB attenuator can be substituted with two minimum loss pads and a 50Ω 10 dB attenuator.
NOTE: a set of 75Ω attenuators (3,6,10,20 dB) is available as 86213A.
1-12 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performance Test Software
File Structure
The program disk contains several different files in addition to the main program file. The
following list describes the files found on the performance test software disk.
CAL871XE This is the main program file.
Cfg_xxxx This is the configuration file. The variable
user-defined name or
Dflt (default). This file contains all the configuration
xxxx represents any
set-ups for the program such as:
• file directories and paths
• test equipment serial numbers
• GPIB addresses
• types of test equipment
• other optional choices
If more than one configuration file exists on the disk, the program will
prompt you to select a specific configuration file to load. If none exists, the
program will create a default file.
P1D_xxxx The cal factor file for the HP/Agilent 8481D sensor. The variable
xxxx
represents the last four digits of the HP/Agilent 8481D or HP/Agilent
8484A sensor's serial number.
P2A_xxxx The cal factor file for the HP/Agilent 8482A sensor. The variable xxxx
represents the last four digits of the 8482A sensor's serial number.
P3A_xxxx The cal factor file for the HP/Agilent 8483A sensor. The variable
xxxx
represents the last four digits of the 8483A sensor's serial number.
Stp_xxxx The actual attenuation values for the external 110 dB step attenuator. The
variable xxxx represents the last four digits in the attenuator's serial
number. Attenuator values are measured at 30 MHz on an accurate
system (such as an HP/Agilent 8902A Option 050).
Pd5_xxxx The actual value of the 20 dB 50Ω attenuator as measured by an accurate
system. Values are attenuation versus frequency. The variable
xxxx
represents the last four digits in the attenuator's serial number.
Pd7_xxxx The actual value of the 20 dB 75Ω attenuator as measured by an accurate
system. Values are attenuation versus frequency. The variable xxxx
represents the last four digits in the attenuator's serial number.
dxxExxxx The data file that holds the analyzer's test results. The variable
xxxx
represents the last four digits in the analyzer's serial number. The file
“d2TExxxx” holds data for an 8712ET, “d4SExxxx” for an 8714ES.
CurEDUTx The data file that holds the test results of the most recently tested
analyzer regardless of model or serial number. The variable
x can
represent any character 0 to 9.
Service Guide 1-13
Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
INSTALL This program is not necessary but can help speed the installation of the
LIF version program. It automatically copies the required files into the
desired location.
NOTE Several data files are present on the disk with the “xxxx” suffix. These are
default files that allow operation of the program without correction factors.
The values in these file are nominal values. For example: 100 percent for all
sensor cal factors; 20 dB for the 20 dB attenuators; 10.00, 20.00, 30…dB for
the external step attenuator , and so on. This is provided as a convenience only
to demonstrate or learn about the program. The default configuration file will
access these files if no user-defined serial number is specified. A warning
message will be displayed if the program is using these default files.
Configuration File
The configuration (config) file is the file that customizes this program for your usage. It
contains specific information for your setup. Some of the items contained in this file
include:
• the GPIB addresses of all the test equipment
• the GPIB address of the analyzer under test
• the model numbers of the test equipment
• the serial numbers of sensors, fixed attenuators, and the external 110 dB step
attenuator
• the disk drive locations (path and directories)
• other items specific to your setup
Ideally, only one configuration file should exist on the program disk so that the program
will automatically load only that file. However, it is possible to have several configuration
files stored on the same disk. In this case, the program will list all of the available files and
prompt you to select one. This is useful if more than one setup is commonly used or if one
performance test software disk serves several workstations.
1-14 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
SET TIME
RESUME
CONFIG
RF Network Analyzers Performance Test Software
Getting Started
CAUTION Make a copy of the performance test software disk for day-to-day use. The
master copy should remain stored in a safe place. This will decrease the
likelihood of damage to the master disk.
NOTE The DOS version, which is used in conjunction with HP BASIC for Windows,
requires the proper setup of the GPIB interface card and drivers. This
document assumes that users are familiar with HP BASIC for Windows , that
it is running, and that it has been properly installed and configured.
First, find all serial numbers of the calibration devices required, such as external step
attenuators, sensors, and fixed attenuators for both 50Ω and 75Ω devices (if applicable).
Verify the GPIB addresses you will be using, as well as the mass storage directories and
locations.
If you plan to operate this program only from the supplied floppy disk, insert the disk into
the computer's disk drive and skip step 1 next.
Performance Test Software Installation
1. To install this program to the hard drive, either copy all files (except “INSTALL”) to the
hard drive, or load and run the “INSTALL” program. The INSTALL program will
automatically copy all required files to your specified destination drive or directory
(HFS, SRM or LIF format). The INSTALL program is only contained in the LIF
software version.
NOTE Any directory name used must be less than 80 characters long, and preferably
less than 60 characters, for best visibility.
2. Set the computer's “Mass Storage Is” (MSI) command to the directory or drive location
of the main program file (CAL871XE).
3. GET and RUN the CAL871XE program. The program will display the initial screen
with the software part number, revision date and current time/date. If the current time
or date is incorrect, select the softkey to set it.
4. Press . Remember that the key can also be used as softkey #1.
5. Press to enter the configuration screen.
This menu allows you to enter all the specific information that pertains to your
particular configuration (such as test equipment, addresses, and serial numbers). The
configuration file's selection descriptions and their initial default values are listed
below.
Return
Service Guide 1-15
Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
Configuration Menu
In this section, the default values for the parameters listed in bold type appear in
parenthesis.
The analyzer's GPIB address (716). The first selection is the analyzer’s (DUT) GPIB
address. Please note that this is the only address that has both the Interface Select Code
(ISC) and the device number associated with it. This address can be any valid address with
any valid ISC. The ISC doesnot have to be the same as all the other test equipment (which
must be all on the same ISC). Generally the full address for the DUT is set to either 716 or
816. This also sets the ISC to 7 or 8 respectively. The factory default GPIB device address
for the analyzer is 16.
The ISC for the test equipment (7). This selection is the ISC for all the associated
test equipment. This is generally 7 or 8 and may be the same as that for the DUT.
The power meter model number (437B) and address (13). These two selections
are for the power meter model number and address.
CAUTION The program will accept the 436A power meter as a valid selection, but it is
not recommended or supported and may cause the program to halt execution.
The spectrum analyzer (8566B) and address (18). This is the spectrum analyzer
selection. Any of the listed models will suffice, but keep in mind that if you do not use a
frequency counter, then the spectrum analyzer must have high degree of frequency
accuracy since it will be used as the frequency counter.
The function generator model number (8116A or 33120A) and address (14).
This selection is for the function generator and address. The 8116A is the only valid
selection at this time.
The attenuator switch driver model number (11713A) and address (28). Next
is the attenuator switch driver selection and address. At this time, the only two c hoices are
the 11713A and “NONE”. If “NONE” is selected, the program will prompt you to manually
set the external 110 dB step attenuator each time it needs to be changed. Since this is
inconvenient, the use of an 11713A with a 8496G model attenuator is highly
recommended.
The frequency counter model number (5342A) and address (02). The frequency
counter model number and its address are next. If “NONE” is selected, the program will
use the spectrum analyzer to measure frequency accuracy.
The voltmeter model number (3456A) and address (22). This selection is not
currently used by this program.
1-16 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performance Test Software
The printer address (01). The printer address is next. No model number is needed
here; all GPIB printers should work equally well. For the DOS version, entering any valid
number except 10 will direct the output to the attached GPIB printer. Selecting an address
of 10 will redirect the output to the defined Windows default printer. Typically this will be
a printer attached to the computer's parallel port or a networked printer. On the DOS
version (HP BASIC for Windows), the default address is set to 10.
The program directory and the mass storage unit specifier (the current MSI
device).
should point to the location of the CAL871XE program and all of its required data files (all
the files contained on the disk). If you are running this program from a floppy disk, the
program directory entry should be blank. If using an HFS or SRM system, the entire
directory name should be entered here (e.g. /TESTS/ANALYZER/NETWORK/8712E). The
entire length must be less than 80 characters (preferably less than 60 for easier viewing).
The MSUS, which indicates the physical address of the disk drive , also has an 80-character
limit. For the DOS version, this is typically just the drive letter (for example , C:). When the
program is first run, the default will be the current MSI device.
The program directory and Mass Storage Unit Specifier (MSUS) are next. These
The data directory and MSUS. The next two entries are the data directory and
MSUS. These should point to the location where the results of each DUT will be stored (if
applicable). The data directory and MSUS are otherwise similar to the program directory,
including the defaults.
The sensor's, external 110 dB step attenuator's, and fixed attenuator's (pad's)
serial numbers (xxxx).
the serial numbers for the power meter sensors, the step attenuator, and the 20 dB
attenuators. This allows the program to load the proper correction values for each device.
The disk contains files that match these default serial numbers (xxxx), but the correction
data contained within these files is invalid (e.g. 100 percent for all sensor cal factors). This
allows the program to be run for experimental or training purposes only. As a precaution, a
warning message will be displayed if a default file is loaded.
Six of the next seven entries will contain the last four digits of
The step attenuator's 40 dB card selection (3). This selection is choice of the 40 dB
step section. The 8496G step attenuator contains one 10 dB section, one 20 dB section, and
two 40 dB sections. This selection specifies which of the two 40 dB attenuator card sections
of the 8496G step attenuator is to be used; section 3 or 4. Enter the value (3 or 4) for which
you have calibration data.
For example, when the step attenuator was calibrated, one of the two 40 dB sections was
selected for the 40, 50, 60, and 70 dB attenuation value. The data corresponding to the
selected 40 dB section must be input to ensure valid measurement data when using
attenuations of 40 dB or greater. For purposes of identification, section 3 of the attenuator
is the section that is engaged when button #3 or #7 of the 11713A is lit.
This entry is not applicable if you are using a manual attenuator.
The beeper (on). The last selection will suppress or enable the beeper, as desired.
Service Guide 1-17
Performance Checks 8712ET/ES and 8714ET/ES
CAL DATA ENTRY
Performance Test Software RF Network Analyzers
The current DUT file suffix (1). This file, “CurEDUTx,” contains the test-result data
of the current device under test. Up to ten different file names can be specified. This allows
multiple users to operate from one system storage medium, such as an SRM environment.
This entry can be ignored for single-user applications.
Config file and cal data generation.
1. Once all desired changes have been made, the program will ask if you want to store the
data just entered. A specific 4-character file name suffix can be provided if more than
one configuration is required. Leaving the file name blank will result in the default file
name of “Cfg_dflt.” If the program finds only one config file, that file will be loaded
automatically. If more than one is discovered, the program will list the file names found
and allow you to choose one. At this point the program will also ask you if a hardcopy
printout is desired.
2. After the config file has been generated, the proper data files containing the correction
values must be generated. Press . You will be shown a list
including:
• 3 sensors
• an external 110 dB step attenuator
• two 20 dB attenuators (pads)
You will need to enter the correction data for every piece of test equipment included in
this list that you will be using to test the analyzer. Select the desired item.
Sensors. All sensors require both frequency and cal factor data. Frequencies must always
be in MHz and cal factors in percent. The first entry requested will be the last four digits of
the serial number. The computer will search for a current configuration file containing this
information. If one is present, the program will query you to either view or edit the old
values.
Assuming you are editing the data, the 50 MHz reference cal factor will be requested next.
This value must use percent as its units and be within the range of 50 and 150 percent.
After the cal factor is entered, the program will request that all frequency/cal factor pairs
be entered. Any frequency entered must be greater than zero. You must start with the
lowest frequency for which you have data and sequentially enter higher frequencies until
done. Each entry must consist of both a frequency in MHz and the cal factor in percent,
separated by a comma (e.g. 500, 98.6). Each frequency entered must be higher than the
previous entry. These cal factor values must be between 75 and 125 percent.
TIP If a mistake is made, you can back up one entry and re-enter a value by
entering a negative frequency. If you accidentally enter only the frequency
(instead of a frequency/cal factor pair), the computer will wait for the cal
factor to be entered; however the only prompt will be a “?”.
Each entry is shown on the CRT. When all entries are completed, enter “0,0” to exit the
data entry portion of the program. At this point the program will redisplay all of the values
entered and ask if you want to store them. (Check to make sure there are no entries for a
zero value frequency.)
1-18 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
RESUME
SET TIME
HELP
EXIT
SET TIME
HELP
EXIT
RESUME
CONFIG
LOAD CONFIG
CAL DATA ENTRY
RF Network Analyzers Performance Test Software
TIP Even if you find a mistake, it will be easier to answer yes, then go back and
re-edit the values. Otherwise you will have to re-enter all of the values again.
20 dB Attenuators (Pads). A procedure similar to the sensor data entry procedure is
used to enter the frequency/attenuation values for the 20 dB attenuators. Valid entries for
the 20 dB attenuator range from 17.5 to 23.5 dB with all frequency entries being greater
than zero.
External 110 dB Step Attenuator. Step attenuator data is only measured at 30 MHz
so only one value needs to be entered for each nominal attenuation step. All values are
relative to the 0 dB setting, which is defined as zero (i.e. the program does not care about
insertion loss at the 0 dB setting).
Valid entries are within 3 dB of the nominal attenuation setting with all entries being
greater than zero. The program will request data up to 110 dB of attenuation.
Using the Program
NOTE Remember that the / / key on your computer’s
Return Enter Execute
keyboard can be used as softkey #1.
When the program is first run, the initial information screen is presented. This contains
the program name, revision number, date and other miscellaneous information. You are
presented with four softkey choices: , , , and .
allows you to set the time and date. If the date has never been set, the
program will force you to enter it regardless of whether or not this softkey is pressed.
will present some very brief instructions and other information.
will terminate the program.
will continue execution of the program and proceed to the main menu.
Main Menu
The main menu provides seven softkey choices. An eighth choice may be displayed if you
are returning to this menu from the test selection menu.
allows you to define a particular configuration of test equipment, mass storage,
and GPIB addresses. This selection is described earlier in “Configuration File” on page
1-14.
allows you to select one of several configurations to choose from. If only
one is available, it is automatically loaded without further confirmation. If several are
available, you are instructed to select one.
attenuators. See “Configuration File” on page 1-14.
Service Guide 1-19
allows you to enter correction factors for sensors, attenuators and
Performance Checks 8712ET/ES and 8714ET/ES
PRINT RESULTS
NEW DUT
GPIB Addr’s
EXIT
RESUME
RESUME
Performance Test Software RF Network Analyzers
allows you to print or view test results from the current DUT or any
previously tested analyzer, assuming the data was archived. You can also add comments or
correct any header information that was previously entered.
Printed test results have a “pass/fail” column for indicating the outcome of each part of
each test. The possible outcomes are
PASS Applies to a warranted specification. The test has passed.
FAIL Applies to a warranted specification. The test has failed.
Not Tested Indicates the test was performed, but the result was not checked. This is
usually due to limited capability of the test equipment.
No Spec Applies to a nonwarranted characteristic or typical parameter. The test
result is satisfactory (within the indicated limits).
No Spec* Applies to a nonwarranted characteristic or typical parameter. The test
result is marginal (outside the indicated limits). If the result is
substantially outside the limit, there may be cause for concern about the
proper operation of the analyzer.
will appear only after an analyzer has been tested. This softkey must be
selected before you begin to test another analyzer.
NOTE This is the only way that the program can tell that the analyzer under test
has changed. Once selected, this softkey selection will disappear, indicating
that the program is ready to search for a new analyzer model/serial number.
will display the current expected addresses of all required test equipment.
In addition it will allow you to check each listed address for the presence of an active
device. It will not indicate which device is set to which address. It only indicates whether
or not the device at a given address is capable of handshaking properly. returns to
the previous menu.
will continue the program and look for an analyzer at the specified address.
Make sure that the power is switched on and that the GPIB cable is connected before
pressing .
Once the program finds the analyzer, the serial number is interrogated and the disk is
searched for any previous test results. If none are found, a message is displayed and you
are then allowed to enter any pertinent data regarding this new DUT such as owner,
technician, repair order, comments etc. The test selection menu is then presented.
1-20 Service Guide
8712ET/ES and 8714ET/ES Performance Checks
Set Serial Number
Step Attenuator Test
Measure Step Attenuator
Measure 20 dB Pad
Measure Step Attenuator
RF Network Analyzers Performance Test Software
Test Selection Menu
The test selection menu can be divided into three main categories:
• eleven automated analyzer performance tests
• four utility procedures
• two external broadband detector performance tests (HP/Agilent 86200B or 86201B)
Data for each of the eleven performance tests is archived upon completion.
The four utility programs are described as follows:
1. utility allows you to enter a serial number into the analyzer. This
may be required after some types of repairs.
CAUTION Enter the number carefully; it cannot be easily changed once it has been
entered. If a mistake is made, it will be necessary to contact an Agilent
Technologies service center for correction.
2. The is a cyclical stress test designed to show any weakness in
the mechanical (and therefore, electrical) integrity of the built-in attenuator. (The
attenuator is standard equipment on ES models and is supplied as Option 1E1 on ET
models.) For each cycle, the attenuator card is switched in and out with each resulting
trace measured. Minimum and maximum excursions are then noted. The test is
performed at a low frequency and a high frequency. The number of cycles is selected by
the user. A minimum of twenty-five is recommended. One hundred cycles will take
about five to ten minutes depending upon computer speed. There is no pass/fail
indication but trace variances of more than 0.1 dB should warrant further investigation
or increased monitoring for signs of wear.
3.
(external) is a utility file that uses a power meter to
measure the actual insertion loss at 30 MHz for the 110 dB step attenuator. This
routine should only be used as a last resort if no other method of obtaining data is
available. Generally the attenuator should be measured using one of the following
methods:
• sending the device to a calibration standards lab
• measuring the device with an 8753D with full two-port correction
• measuring the device with an 8902A Option 050
4. is similar to the utility, but is used for
characterizing the 20 dB pad.
NOTE The listed uncertainties shown on the test results assume that one of these
three choices was used and not the built-in routine, which has a much higher
degree of uncertainty.
Service Guide 1-21
Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
The detector performance tests consists of an absolute power accuracy test and a frequency
response test as described in the HP/Agilent 86200B/86201B RF Detectors User's and
Service Guide. These tests are only for testing these two specific detector models.
Archiving of data is not done for these tests.
Additional Information
The program gives full step-by-step instructions along with connection diagrams. For
clarity, some of the required adapters may not be depicted in the connection diagrams.
Generally, solid connection lines between devices indicate a cable connection, where as a
dotted line indicates a direct connection (adapters may be required). All required
equipment should be connected and switched on before proceeding with any test, since the
program will occasionally need to write to a device before it is shown in the connection
diagram. If the device is not connected, the program will time-out before the connection
diagram is drawn. The time-out limit is set to 30 seconds for all devices. If the program
should stop for any reason, the computer may be reset and the program run again with
little or no loss of data (if a
SCRATCH C is not performed).
1-22 Service Guide
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