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8481A
Agilent Technologies 8481A User Manual
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Chapter 3
42
In most cases, the operatio
nal amplifier (m
ade up of A2Q1 an
d the first amplifier of
the power meter
,) is operating correctly
if the dc voltage on the metal cover of A2Q1
(collector) is -70 ±30 mV dc.
51
53
Table of Contents
Default Chapter
7
Table of Contents
7
Introduction
11
General Information
12
Instruments Covered by Manual
12
Description
13
Dimensions
15
8480 Series, B-Models Information
15
Safety Considerations
16
8480 Series, Options
16
8485A and 8485D Option 033
16
Accessories Supplied
16
8483A 75 Ohm Sensor
17
D-Model 8480 Series Sensors (8481D, 8485D, 8485D-033 and 8487D).7
17
8485D-033)
18
Ghz and 33 Ghz Frequency Operation
18
50 Ghz Frequency Operation (8487A and 8487D)
19
Recommended Calibration Interval
20
Warranty
20
8480 Series Power Sensor Specifications
21
Supplemental Characteristics
28
Installation
29
Initial Inspection
29
Environment
29
Interconnections
29
Original Packaging
29
Storage and Shipment
29
Operation
30
Environment
30
Operating Precautions
30
Power Meter Calibrations
30
Modulation Effects
31
Operating Instructions
31
Power Measurements
31
General Information
33
Recommended Test Equipment
34
Connector Care
35
Torque
35
Performance Test
36
Standing Wave Ratio (SWR) and Reflection Coefficient (Rho) Performance Test
36
Replaceable Parts
40
Service
45
Principles of Operation
46
Thermocouple Sensors
46
Diode Sensors
47
Troubleshooting
49
Troubleshooting - Eliminating the Power Meter and Sensor Cable
50
Troubleshooting - Power Sensors
50
A1 Bulkhead (Thermocouple Sensors)
50
A1 Bulkhead (Diode Sensors)
51
A2 Power Sensor Board Assembly
51
Repair
53
A1 Bulkhead Assembly
53
Procedure
53
Repair Strategy
53
A2 Power Sensor Board Assembly
54
Procedure
54
Repair Strategy
54
FET Balance Adjustment
55
Equipment Required
55
Test Description
55
FET Balance Procedure
56
Disassembly / Reassembly Procedures
59
Disassembly Procedure
59
Reassembly Procedures
61
EPM Series Power Meter (E4418B) Modification
63
The Material and Tools Required
64
Impact on Warranty
64
Modification Procedure
65
Bulkhead Assemblies
71
Bulkhead Parts Lists
72
Bulkhead Exploded Graphics
79
4
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Agilent Technologies 8481A Specifications
General
Brand
Agilent Technologies
Model
8481A
Category
Accessories
Language
English
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