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R4,RS

RES,15K,1

%‚1

/8W,METAL

FILM

R-88-15K

RES,1OK,5%,1/4W,COMPOSITION

FILM

R-76-1OK

R6,R12

RES,4.7M,5%,1

/4W,COMPOSITION

FILM

R-76-4.7M

R7,R10

RES,2K,1%,1/8W,METAL

FILM

R-882K

RES,26,7K,1%,1/8W,METAL

FILM

R-88-26.7K

TRANSFORMER

TR-205

TRANSFORMER

TR-257

TP1,TP2

CONN,TEST

POINT

CS-553

U1,U5

IC,RETRIGGERABLE

MONO

MLJLTIVIB,74HC123

IC-492

IC,DUAL

POWER

MOSFET

DRIVER,TSC426

1C437

IC,VOLTAGE

REGULATOR,LM317T

IC-317

IC,18V

OP-AMP,TLC271

IC-347

IC,VAR

POS VOLTAGE

REG,lOOmA,78L05A

IC-223

VR2

DIODE,ZENER

20V,1N4747A

(D041)

DZ-25

VR3

DIODE,ZENER

6.44V,1N4577AGED

(DO-7)

DZ-58

VR4,VR6,VR8

DIODE,ZENER

5.1V,1N751

(DO-7)

DZ-59

VR5,VR7

DIODE,ZENER

24V,1N723

(DO-7)

DZ-17

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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