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Troubleshooting

2-110

2.11.29 Ohms sense tests

Test 600.1 — Ohms sense HI

Type

Pass/Fail

Fault message Ohms sense HI

Description A 4-wire short on the input lines applies LO through the path of Q232 and Q231 (turned on by

control line 4WOHM), through Q243 to BUFFIN to the input buffer. BSCOM goes through

Q207 and Q208 to the A/D MUX U226. The gain is X1.

NOTE: The INPUTS and SENSE jacks must be externally shorted together to run this test.

Drawing reference Analog Board; 2002-100

Components Q207, Q208, Q231, Q232, Q243, and associated components.

Bit patterns

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00000011

—U206—

01100000

—U203—

10101001

—U411—

11111011

—U809—

11100111

—U207—

00001111

—U221—

11100101

—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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