Agilent Technologies 85025A Manual

User’s and Service Guide
Agilent Technologies
85025A/B/D/E
Detectors
Manufacturing Part Number: 85025-90063
Supersedes 85025-90014 & 85025-90031
Printed in USA
Print Date: January 2013
Supersedes September 2002
© Agilent Technologies, Inc. 1995, 2002, 2013

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model number HP 85109C is now model number Agilent 85109C.
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Safety Notes
The following safety notes are used throughout this manual. F
amiliarize
yourself with each of the notes and its meaning before operating this
instrument.
Caution
Caution denotes a hazard. It calls attention to a procedure
that, if not correctly performed or adhered to, would result in
damage to or destruction of the instrument. Do not proceed
beyond a caution sign until the indicated conditions are fully
understood and met.
L The instruction documentation symbol. The product is marked with
this symbol when it is necessary for the user to refer to the instructions in the
documentation.
How to Use This Guide
This guide uses the following conventions:
4
Front-Panel Key
5 This represents a key physically located on the instrument.
NNNNNNNNNNNNNNNNNNNNNNN
Softkey
This indicates a \softkey," a key whose label is determined by
the instrument's rmware.
Screen Text This indicates text displayed on the instrument's screen.
Docu entation Description
This manual contains information on operating, testing, and servicing the
Agilent 85025A/B/D/E detectors.
v

Contents
1. General Information
Product Description . . . . . . . . . . . . . . . . . . . . . . -
Specications and Supplemental Characteristics . . . . . . . . . -3
Operating Environment . . . . ....... . . . . . . . . . -9
Accessories ......................... -9
Storage and Shipment . ... . . . . . . . . . . . . . . . . . -9
Environment . .. . . . . . . . . . . . . . . . . . . . . . -9
Packaging ..........................- 0
Returning a Detector for Service . . . . . . . . . . . . . . . . - 0
2. Installation
Initial Inspection . . . . . . . . . . . . . . . . . . ... . . . 2-
Electrostatic Discharge (ESD) . . . . . . . . . . . . . . . . . . 2-2
Static-Safe Work Station . . . . . . . . . . . . . . . . . .. 2-2
Static-Safe Practices . . . . . . . . . . . . . . . . . . . .. 2-3
Power Requirements . . . . . . . . . . .. .. . . . . . . . . 2-3
Mating Connectors . . . . . . . . . ......... . . . . . 2-3
Connecting the Detector . . . . . . . . .... .. .. . . . . 2-3
3. Operation
Features . . . ......... . . . . . . . . . . . . . . . 3-2
Operating Theory . . . ......... . . . . . . . . . . . 3-2
Measurement System Conguration .. .. .. .. .. .. .. .3-3
DC Detection mode . .. .. .. .. .. .. .. .. .. .. 3-3
Accurate DC Measurements . ................. 3-3
Zeroing the Detector . . . . . . . . . . . . .... .. .. . 3-3
Autozero ......................... 3-3
Manual Zero . . . . . . . . . . . . . . .......... 3-4
AC Detection Measurements .... .. .. .. .. ...... 3-6
Operator's Check ...................... . 3-6
Procedure . .. .. .. .. .. .. .. .. .. . .. .. .. 3-7
If the Operator's Check Fails ................. 3-8
Agilent 85025A/B/D/E Contents-1

4. Performance Tests
Equipment Required . .... .. .. .. .. .. ...
..
.. 4-
Return Loss P
erformance Test ................ .4-3
85025A/B/D/E Return Loss Performance Test Procedure . . . . 4-3
Specications . . ................. .. .. 4-3
Description . . . . . . . . . . . . . . . ..
..
... . . 4-3
Return Loss Measurement . . . . . . . . . . . . . .... 4-6
Calibrating the Scalar Network Analyzer . . . . . . . . . . 4-7
Return Loss from 40 MHz to 8 GHz (to 26.5 GHz for 85025B/E
only, to 50 GHz for 85025D only) . . . . . . . . . . ...4-7
If This Test Fails . . . . . . . . . . . . . .... . . . . . . 4-9
Frequency Response Performance Test . . . . . . . . . . . . . 4-9
Description . . . . . . . . . . . . . . . . ....... . . 4-9
Equipment Required . . . . . . . . . . . . . . . ...... 4-
Equipment Common to 85025A/B/D/E . . . . . . . . . . . . 4-
Additional Test Equipment Required for 85025A . . . .... 4-
Additional Test Equipment Required for 85025A Option 00 .4-
Additional Test Equipment Required for 85025B . . . . . ...4-
Additional Test Equipment Required for 85025D Only . . . . 4-
Additional Test Equipment Required for 85025E Only . . . . 4- 2
Specications . . . . . . . . . . . . . ... . . . . . . . . 4- 3
85025A/B/D/E Frequency Response Performance Test Procedure 4- 3
Conguring the System . . . . ... . . . . . . . . . . . . 4- 3
Characterizing the Source . . . . ..... . . . . . . . . 4- 4
Characterizing the Detector . . . . .... . . . . . . . . 4- 4
Computing the Maximum Error . ......... . . . . . 4- 4
Power Accuracy Performance Test . . . . . . . . . . . . . . . 4- 5
Specications ..... . . . . . . . . . . . . . . . . . . . 4- 5
Description .... ..................... 4- 5
Equipment Required . .... . . . . . . . . . . . . . . . 4- 6
Procedure .... .. .. .. .. .. .. .. .. .. ....4- 7
Absolute Power Accuracy in DC Mode Performance Test . . . 4- 7
Dynamic Accuracy in AC Mode Performance Test .. .... . 4-20
Power Accuracy, Alternate Procedure Using an 8350B (+ 0 dBm
maximum) . . .... .. .. .. .. .. .. .. .. . .. 4-2
Alternate Equipment . ................... 4-2
Procedure . . . ....................... 4-22
Absolute Power Accuracy in DC Mode, Alternate Procedure .. 4-23
Dynamic Accuracy in AC Mode, Alternate Procedure . . . . . . 4-24
Performance Test Record . . . . . . . . . . .......... 4-25
Contents-2 Agilent 85025A/B/D/E

5. Adjustments
6. Replaceable P
arts
How To Order Parts Fast . . . . . . . . . . .. .. .. .. . . 6-
7. Service
Repair . . . . . . . . . . . . . . . .... .. .. .. . . . 7-2
Removing the Covers . . . . . . . . . . . . . ..
..
... 7-2
Procedure . . . . . . . . . . . . . . . ..
...... .. 7-2
Replacing the Detector . . . . . . . . . . . .... .. .. . 7-3
Replacing the Cable Assembly . . . . . . . . . . . . . . . . 7-3
Replacing the Connectors . . . . . . . . . . . . . . . . . . 7-5
8. Detector Maintenance
Mechanical Inspection . . . . . . . ......... . . . . . 8-
Inspecting the Connectors . . . . . . . . .... . . . . . . 8-
Visual Examination . . . . . . . . . ..... . . . . . . . 8-2
Cleaning the Connectors . . . . . . . . . . ... . . . . . . . 8-2
Connector Cleaning Kit . . . . . . . . . . ... . . . . . . 8-2
Gaging Connectors . . . . . . . . . . . . .. . . . . . . . . . 8-2
Gaging Connectors to be Mated with the 85025A/B/D/E . . . . 8-3
Type-N female . . . . . ... . . . . . . . . . . . . . . . 8-3
Precision 7 mm . . . . ... . . . . . . . . . . . . . . . 8-3
Precision 3.5 mm female . . . ..... . . . . . . . . . . 8-3
9. Automated Program Listing
Automating the Frequency Response Test . . . . . . . . . . . . 9-
Cal Factor Entry Program . . . . . . . . . . . . . . . . . . 9-2
Running the Cal Factor Entry Program . . . . . . . . . . . 9-2
Detector Frequency Response Program . ... . . . . . . . . 9-3
Running the Detector Frequency Response Program . . . . . 9-3
Measurement Setup . . . . . . . . . . . . .. .. .. .. .. 9-5
Example Programs . . . . . . . . . . . . ... . . . . . . . . 9-5
Index
Agilent 85025A/B/D/E Contents-3

Figures
- . 85025A/B/D/E Detector . . ................. -2
2- . Example of a Static-Safe W
ork Station . . . . . . . . . . . . 2-2
3- . Detector Features ..
. . . . . . . . . . . . . . . . . . . . 3-2
3-2. Typical System Setup for 0.0 to 50 GHz Measurements . . . . 3-5
3-3. Operator's Check Equipment Setup . ............. 3-7
4- . Setup for 85025A/B/D/E Return Loss Test ........... 4-6
4-2. 85025A/B/E Return Loss 0.04 GHz to Maximum Frequency . . . 4-8
4-3. Frequency Response Measurement Setup . ... . . . . . . . 4- 2
4-4. Absolute Power Accuracy Test Setup . . . . . . . . . . . . . 4- 7
4-5. Power Accuracy Alternate Test Setup . . . . . . . . . . . . . 4-22
6- . Module Exchange Program . . . . . . . . . . . . . . . . . . 6-3
7- . Removing the Detector Covers . . . . . . . . . . . . . . . . 7-2
7-2. Cable Connections . . . . . . . . . . . . . . . . . . . . . . 7-5
9- . Typical Program Output . . . . . . . . . . . . . . . . . . . 9-4
Contents-4 Agilent 85025A/B/D/E

Tables
- . 85025 Series Detector Descriptions . . . . . . . . . . . . . . -
-2. 85025A/B/D/E Detector General Specications . . . . . . . . . -3
-3. 85025A Detector Specications (including Option 00 ) . . . . . -4
-4. 85025B Detector Specications . . .... .. . . . . . . . . -5
-5. 85025D Detector Specications . . ....... . . . . . . . -6
-6. 85025E Detector Specications ... . . . . . . . . . . . . . -7
-7. 85025A/B/D/E Detector Supplemental Characteristics . . . . . -8
3- . Equipment Required for Operator's Check . . . . . . . . . . . 3-6
4- . Recommended Equipment . . . . . . . . . . . . . . . . . . 4-2
4-2. 85025A/B Return Loss with Measurement Uncertainty . . . . . 4-5
4-3. 85025D Return Loss with Measurement Uncertainty . . . . . . 4-5
4-4. 85025E Return Loss with Measurement Uncertainty . . . . . . 4-5
4-5. Approximate Error Analysis at 8 GHz for 85025A/B/E Detectors 4- 0
4-6. Approximate Error Analysis for the 85025D Detector . . . . . 4- 0
6- . 85025A/B/D/E Replaceable Parts and Accessories . . . . . . . 6-2
Agilent 85025A/B/D/E Contents-5