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Keithley Manuals
Measuring Instruments
236
Service manual
Keithley 236 Service Manual
Source measure unit and high voltage source measure unit
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Also See for 236
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Applications manual
(201 pages)
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Instruction manual
(93 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Performance Verification
Introduction
Environmental Conditions
Initial Cond1Tions
Required Test Equtpment
Verifications Procedures
Equipment Characterization
Table 1-3 Model 263 I-Source Characteristics
Common Mode Verification
Figure 1-2 Setup for Common Mode Verification
Voltage Source Verification
Figure 1-3 Setup for Voltage Source Ranges Verification
Voltage Measure Verification
Figure 1-4. Setupfor Voltagemeasure Ranges Verification
Table 1-5 Voltage Measure Verification
Remote Sense Verification
Figure 1-5 Setup for Remote Sense Verification
Low Current (Ina to Loma) Measure Ranges Verification
Low Current (Ina to Loma) Source Ranges Verification
Looma Measure Range Verification
Figure 1-8 Setup for Looma Measure Range Verification
Looma Source Range Verification
Calibration
Introduction
Recommended Calibration Equipment
Environmental Conditions
Warmup Period
Cal Lock
Calibration Procedures
Equipment Characterization
Figure 2-2 Setup for Equipment Characterization
Table 2-3 Model 263 I-Source Characterization
Voltage Calibration
Figure 2-3 Setup for Volts Calibration
Looma Range Calibration
Low Current Ranges Calibration (Ina Loma)
Calibration Errors
Table 2-4 Calibration Error Messages
Calibration Program
Table 3-1 Line Fuse Selection
Introduction
Line Fuse Replacement
Fan Filter Cleaning
Handling and Cleaning Precautions
Disassembly Instructions
Figure 3-3 Resonant Converter Board (Model 237)
Figure 3-4 Output Board
Figure 3-5 Analog Board (Shields Removed)
Diagnostics
Table 3-2 Recommended Troubleshooting Equipment
Special Handling of Static Sensitive Devices
Recommended Test Equipment
Power Supply Checks
Table 3-3 Power Supply Checks
Analog Switching
Table 3-4 Analog Switching; Current Ranging
Table 3-5 Analog Switching; Volts Ranging
Table 3-6 Analog Switching; Feedback
Digital and Display Checks
Table 3-9 Digital Circuitry Checks
Table 3-10 Display Circuitry Checks
Principles of Operation
Introduction
Analog Circuitry
V/I Control and Readback
Output Stage
Figure 4-3 Model 236 Output Stage (Simplified Schematic Diagram)
Feedback
Figure 4-6 Damping Relay Contact Bounce
Resonant Converter (Model 237)
A/D Converter
Table 4-1 Volts Range Relays
Digital Circuttry
I/O Controller
Source/Measure Controller
Communications
A Display Circuitry
Powersupply
Introduction
Parts Lists
Ordering Information
Schematic Diagrams and Component Location Drawings
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Schematic Diagrams and Component Location Drawings
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Publication Date: October 1991
Document Number: 236-902-01 Rev. D
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