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Troubleshooting

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Bit patterns

Test 200.2 — A/D noise

Type

Pass/Fail

Fault message

Signal conditioning noisy

Description

This test uses the same circuit setup as test 200.1. The A/D is triggered for 10 readings and a

minimum/maximum comparison is done for 50 counts or less. Failing this test indicates A/D

buffer noise or A/D converter circuit noise.

Drawing reference

Analog Board; 2002-140

A/D Converter; 2002-160

Components

A/D buffer or converter noise, power supply or reference supply noise.

Bit patterns

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00010111

—U206—

01110000

—U203—

10001110

—U411—

11111011

—U809—

01101111

—U207—

00001111

—U221—

11101001

—U406—

00000100

AD_STB

MUX_STB

R1_STB

R2_STB

*Bits associated with register IC terminals as follows:

QQQQQQQQ

87654321 87654321 87654321 87654321

IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00010111

—U206—

01110000

—U203—

10001110

—U411—

11111011

—U809—

01101111

—U207—

00001111

—U221—

11101001

—U406—

00000100

AD_STB

MUX_STB

R1_STB

R2_STB

*Bits associated with register IC terminals as follows:

QQQQQQQQ

87654321 87654321 87654321 87654321

IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.

Brand	Keithley
Model	2002
Category	Multimeter
Language	English

Keithley 2002 Repair Manual

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Questions and Answers:

Keithley 2002 Specifications

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