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U41

IC,DUAL

BIT

DECADE

COUNTER,74HC390

IC-500

U42,U44

IC,8

STAGE

SHIFr/STORE

IC251

U43,U52

IC,TRII‘LE

MULTI/DEMUX,4053

IC283

U45

IC,8

BIT

IDENTITY

COMP,74HC688

1C488

U48

IC,LOW POWER

OFFSET

VOLT

QUAD

COMP,339

IC-219

U49,U55

IC,DUAL

D-TYPE

FLIP

FLOP,74HC74

IC337

U50

IC,LOW

NOISE

OPAMP,5534

IC-540

U51,U57,U59

IC,HEX

INVERTER,74HC04

IC-354

IC,QUAD

INPUT

NAND,74HC00

IC-351

U56

IC,DUAL

LOW

NOISE

OPAMP,NE5532

IC5O1

VR1

IC,+5V

REGULATOR,3A,LM323

IC-240

VR2

IC,+5V VOLTAGE

REGULATOR,7805

324692

VR3

IC,POS

VOLTAGE

REG

+15V,500mA,78M15

324695

VR4

IC,NEG

VOLTAGE

REG

45V,500mA,79M15

324696

VR5

IC,VOLTAGE

REGULATOR,LM317MP

IC-308

VR6

IC,VOLTAGE

REGULATOR,LM337MP

IC3O9

VR7,VR8

DIODE,ZENER,15V,1N4744A

DZ75

VR9

DIODE,ZENER,68V,1N4760A

DZ83

JUMPER

J45

OSCILLATOR,

8MHZ

CR254

CRYSTAL,7.68MHZ

CR29

Table of Contents21
Performance Verification27
Introduction27
Environmental Conditions27
Initial Cond1Tions27
Required Test Equtpment28
Verifications Procedures28
Equipment Characterization30
Table 1-3 Model 263 I-Source Characteristics31
Common Mode Verification32
Figure 1-2 Setup for Common Mode Verification33
Voltage Source Verification34
Figure 1-3 Setup for Voltage Source Ranges Verification35
Voltage Measure Verification35
Figure 1-4. Setupfor Voltagemeasure Ranges Verification36
Table 1-5 Voltage Measure Verification37
Remote Sense Verification37
Figure 1-5 Setup for Remote Sense Verification38
Low Current (Ina to Loma) Measure Ranges Verification38
Low Current (Ina to Loma) Source Ranges Verification43
Looma Measure Range Verification44
Figure 1-8 Setup for Looma Measure Range Verification45
Looma Source Range Verification46
Calibration49
Introduction49
Recommended Calibration Equipment49
Environmental Conditions50
Warmup Period50
Cal Lock50
Calibration Procedures50
Equipment Characterization51
Figure 2-2 Setup for Equipment Characterization52
Table 2-3 Model 263 I-Source Characterization53
Voltage Calibration54
Figure 2-3 Setup for Volts Calibration55
Looma Range Calibration57
Low Current Ranges Calibration (Ina Loma)59
Calibration Errors61
Table 2-4 Calibration Error Messages62
Calibration Program64
Table 3-1 Line Fuse Selection73
Introduction73
Line Fuse Replacement73
Fan Filter Cleaning73
Handling and Cleaning Precautions76
Disassembly Instructions76
Figure 3-3 Resonant Converter Board (Model 237)77
Figure 3-4 Output Board78
Figure 3-5 Analog Board (Shields Removed)79
Diagnostics82
Table 3-2 Recommended Troubleshooting Equipment82
Special Handling of Static Sensitive Devices82
Recommended Test Equipment82
Power Supply Checks84
Table 3-3 Power Supply Checks84
Analog Switching85
Table 3-4 Analog Switching; Current Ranging85
Table 3-5 Analog Switching; Volts Ranging86
Table 3-6 Analog Switching; Feedback86
Digital and Display Checks87
Table 3-9 Digital Circuitry Checks88
Table 3-10 Display Circuitry Checks89
Principles of Operation90
Introduction90
Analog Circuitry91
V/I Control and Readback91
Output Stage93
Figure 4-3 Model 236 Output Stage (Simplified Schematic Diagram)94
Feedback95
Figure 4-6 Damping Relay Contact Bounce96
Resonant Converter (Model 237)97
A/D Converter97
Table 4-1 Volts Range Relays97
Digital Circuttry98
I/O Controller98
Source/Measure Controller99
Communications99
A Display Circuitry99
Powersupply100
Introduction102
Parts Lists102
Ordering Information102
Schematic Diagrams and Component Location Drawings102

Brand	Keithley
Model	7012-S
Category	Measuring Instruments
Language	English

Keithley 7012-S Service Manual

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