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6675A
Agilent Technologies 6675A Service Manual
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Manual Updates
The following updates have been made to this m
anual
since the print revision i
ndicated on the title page.
5/09
Information about the A3 FET assembly
has been updated. The surface-mount
A3 FET assem
bly is the recommended
replacement part for previous
version A3 assem
blies.
7/09
The performance test records on pages 24 – 28 have been upda
ted to remove the m
easurement uncertai
nties and correct
minor discrepancies in the test limits.
160
Table of Contents
Default Chapter
2
Exclusive Remedies
2
Limitation of Warranty
2
Printing History
4
Table of Contents
5
Table
5
Introduction
7
Scope
7
Organization
7
Related Documents
7
Change Sheet
7
Operating Manual
7
Instrument Identification
8
Manual Revisions
8
Firmware Revisions
8
Safety Considerations
8
Conventions
9
Electrostatic Discharge
9
Verification
11
Introduction
11
Tests
11
Test Equipment Required
11
List of Equipment
11
Current-Monitoring Resistor
11
Electronic Load
12
Programming the Tests
13
General Considerations
13
Programming Parameters
13
General Measurement Techniques
13
Performance Test Record Sheets
13
Operation Verification Tests
14
Performance Tests
15
Constant Voltage (CV) Tests
15
Test Setup
15
Test Procedures
15
Constant Current (CC) Tests
19
Test Setup
19
Test Procedures
19
Averaging the CC Measurements
22
Troubleshooting
29
Introduction
29
Localizing the Problem
29
Chapter Organization
29
Test Equipment Required
30
Troubleshooting Procedures
30
Power-On Selftest
30
Description
30
Disabling the Power-On Selftest
30
Using the *TST? Query (GPIB Systems Supplies Only)
30
Troubleshooting Charts
32
Troubleshooting Test Points
32
Bias and Reference Supplies
32
Figure
32
CV/CC Status Annunciators Troubleshooting
53
A5 Control Board Troubleshooting Setup
53
A3 FET Board Troubleshooting
53
Signature Analysis
56
Introduction
56
Firmware Revisions
56
Test Headers
56
Post-Repair Calibration
63
When Required
63
Inhibit Calibration Jumper
63
Calibration Password
63
Restoring Factory Calibration Constants
63
EEPROM Initialization
64
Transferring Calibration Constants to Factory Preset Locations
64
Disassembly Procedures
69
Top Cover
69
RFI Shield
69
Front Panel Assembly
70
S1 Line Switch
70
A1 Front Panel Board
70
A1DSP1 LCD Display
70
A1G1 and A1G2 Rotary Controls
70
A1KPD Keypad
71
Rear Panel And/Or A2 GPIB or Isolator Board
71
Output Subchassis
71
A5 Control Board
71
A6 Output Filter Board
72
A7 Snubber Board and D900 Output Rectifier
72
T900 Output Power Transformer/L900 Output Choke
72
AC Input Filter
72
A3 FET Board and Heatsink Assembly
73
A4 AC Input Board
74
B1 Fan
74
Principles of Operation
77
Introduction
77
Interface Control Circuits
77
A2 GPIB Board (667Xa Series Only)
77
A2 Isolator Board Circuits (657Xa Series Only)
78
A1 Front Panel Assembly
78
A5 Control Board
79
Secondary Interface
79
CV/CC Control
80
Switching/Downprogramming Control
80
Power Circuits
81
A4 AC Input Board
81
Input Filter and Rectifier
81
Bias Supplies and Bias Detect
81
Fan Speed Control
81
A3 FET Board
82
Output Circuits
82
Replaceable Parts
85
Introduction
85
Chapter Organization
85
Reading the Tables
85
How to Order Parts
86
Diagrams
117
Introduction
117
Chapter Organization
117
General Schematic Notes
123
Table
123
Backdating
145
Figure
153
Index
155
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Agilent Technologies 6675A Specifications
General
Brand
Agilent Technologies
Model
6675A
Category
Power Supply
Language
English
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