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Test 302.2 — 2W SENSE

Bank DC/OHM

Inputs Open

Expected Value 12.4 volts

Limits 0.5 volts

Fault Message 2W SENSE 13V

Description

Same as test 302.1 except the +13.3V reference is used. This voltage does

not go through the ohms zener clamp path but is clipped by the A/D circuit

itself at about 12.4V due to the fact that 13.3V approaches the power supply

limits of the op amps. Measure +12.4V at AD_IN.

Bit patterns

Bit pattern Register

87654321

—U106—

110v1111

87654321

—U109—

00011111

87654321

—U134—

0v01000v

—U130—

10111101

87654321

—U121—

10000010

ACDC_STB

MUX_STB

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

2-36 Troubleshooting

Keithley 2000 Repair Manual

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