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478A
Keysight 478A Manuals
Manuals and User Guides for Keysight 478A. We have
2
Keysight 478A manuals available for free PDF download: Operating And Service Manual
Keysight 478A Operating And Service Manual (55 pages)
Thermistor Mount
Brand:
Keysight
| Category:
Measuring Instruments
| Size: 1.51 MB
Table of Contents
Declaration of Conformity
2
Certification
3
Warranty Information
3
Limitation of Warranty
3
Exclusive Remedies
4
Safety Considerations
4
Waste Electrical and Electronic Equipment (WEEE) Directive
5
Product Category
5
Sales and Technical Support
5
Table of Contents
7
List of Figures
9
List of Tables
11
Figure 1-1 Keysight Model 478A Thermistor Mount
14
Safety Information
2
1 General Information
15
Introduction
15
Instruments Covered by Manual
15
Incoming Inspection
15
2 Operation
18
Biasing Thermistors
18
Maximum Input
18
Average Power
18
Pulse Energy and Peak Power for 478A/432 Combination
19
Figure 2-1 Maximum Power Meter Reading Vs PRF for Pulses Shorter than 250 Μs
19
Pulse Energy and Peak Power for 478A/431 Combination
20
Figure 2-2 Maximum Power Meter Reading Vs Duty Cycle for
20
Figure 2-3 Maximum Power Meter Reading Vs Square and Sine-Wave Frequency
21
Zero Set
22
RF Power Turned off for Zero-Set
22
Thermistor Mount Disconnected for Zero Set
23
Figure 2-4 Source Impedance Shunting One RF Thermistor Mount
23
Figure 2-5 Schematic Diagram of a Model 478A Thermistor Mount When Connected to a 431 Power Meter
25
Thermoelectric Effect
26
Thermoelectric Effect Error Correction for 478A / 431 Combination
27
Thermoelectric Error for 478A / 432 Combination
27
Circuit Description
28
431 Power Meter Detection
29
432 Power Detection
29
3 Specifications and Characteristics
31
4 Maintenance
34
Mechanical Shock
34
Check on Thermistor Match
34
Figure 4-1 Schematic Diagram of a Model 478A Thermistor Mount When Connected to a 432 Power Meter
34
Figure 4-2 Check on Model 478A Thermistor Resistance Match
35
Repair
36
Figure 4-3 Thermistor Compensation
37
Thermistor Assembly Replacement Procedure
39
Removal Procedure
41
Figure 4-4 Model 478A Thermistor Mount Assembly
41
Installation Procedure
42
Figure 4-5 Keysight Model 478A Printed Circuit Assy Wiring
42
Recalibration
43
Appendix A Introduction
46
A Appendix A
46
How to Use this Appendix
46
Manual Changes
47
Change a
47
Figure A-2 Schematic Diagram of a Model 478A Thermistor Mount When Connected to a 432 Power Meter
48
Figure A-3 Check on Model 478A Thermistor Resistance Match (P/O Change A)
49
Change B
50
Figure A-4 Source Impedance Shunting One RF Thermistor Mount (P/O Change B)
50
Figure A-5 Schematic Diagram of a Model 478A Thermistor Mount When Connected to a 431 Power Meter
51
Figure A-6 Schematic Diagram of a Model 478A Thermistor Mount When Connected to a 432 Power Meter
52
Figure A-7 Thermistor Compensation (P/O Change B)
53
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Keysight 478A Operating And Service Manual (23 pages)
Option H83 Thermistor Mount Manual Modifications
Brand:
Keysight
| Category:
Measuring Instruments
| Size: 0.95 MB
Table of Contents
Table of Contents
7
General Information
9
Description
10
Specifications
11
Mount Calibration
12
Operation
13
Zero Set
13
Operating Principles
13
Testing
14
Maintenance
15
Replaceable Parts
16
Safety and Regulatory Information
17
Introduction
17
Connector Care and Cleaning
17
Before Applying Power
17
Shipping Instructions
17
Compliance with Canadian EMC Requirements
17
Compliance with German Noise Requirements
18
Declaration of Conformity
18
Statement of Compliance
18
Warnings
19
Cautions
20
Instrument Markings
21
Contacting Keysight
22
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