Name: Keithley 236
Brand: Keithley
Rating: 4 (1 reviews)

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MODEL

236/237

DISPLAY

BOARD, PARTS

LIST

CIRCUIT

KEITHLEY

DESIG.

DESCRIPTION

PART

NO.

C1..C4

CAP,.O1UF,20%,50V,CERAMIC

CAP,1OuF,2O+1OO%,25V,ALUM

ELEC

CR1..CR1O

DIODE,SILICON,1N4148

(DO35)

PLOT

LIGHT,RED,LED

DISPLAY,DIGITAL

(DOUBLE

DIGIT)

REANGULAR

LICHT

SOURCE

FOR

DS1O..DS28

MOUNTNG

KIT

CABLE

ASSEMBLY,

CONDUCTOR

..R23,R25,R27,

R76-82

R24,R26

R-7645

R28,R32

R763.3K

R29..R31,R33,R34

R-76-82

IC-412

1C407

IC-583

U4,U7,U8

IC-578

U5,U6,U9,U1O

IC537

DSIO..DS28

DS1..DS9

D529

P24

C-365-.O1

C-31440

RF-28

PL—71

DD39

PL81

MK-22-1

CA279

S2..S34

RES,82,5%,1/4W,COMPOSITION

FILM

RES,15,5%,1/4W,COMPOSITION

FILM

RES,3.3K,5%,1

/4W,COMPOSITION

FILM

RES,82,5%,1/4W,COMPOSITION

FILM

DIGITAL

CONTACTING

ENCODER

SWITCH,

MOMENTARY

IC,QUAD

INPUT

OR,74HC02

IC,12 STAGE

BINARY

COUNTER,74HC4040

DECODER,74HC42

IC,35OmA

SATURATED SINK

DRIVER

UDN2596A

IC,8BIT,SERIAL4NPUT,5895A2

SW-472

SW435

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

Keithley 236 Service Manual

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Brand	Keithley
Model	236
Category	Measuring Instruments
Language	English