Keithley 2002 Repair Manual page 113

Troubleshooting
Test 412.7 — Frequency, phase 7
Type
Fault message
Description
Drawing reference
Bit patterns
Test 412.8 — Frequency, phase 8
Type
Fault message
Description
Drawing reference
Bit patterns
2-100
Circuit Exercise
None
This test uses the same setup as test 412.1 except that the SELFTEST line is toggled through one
more iteration to finish the frequency measurement.
Analog Board; 2002-100
A/D Converter; 2002-160
—U811—
00001001
—U224—
00010111
—U400— —U432—
01001100 11001010
*Bits associated with register IC terminals as follows:
Q Q Q Q
87654321 87654321
IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.
Circuit Exercise
None
This test uses the same setup as test 412.1 except that the SELFTEST line is toggled through one
more iteration to finish the frequency measurement.
Analog Board; 2002-100
A/D Converter; 2002-160
—U811—
00001001
—U224—
00010111
—U400— —U432—
01001100 11001010
*Bits associated with register IC terminals as follows:
Q Q Q Q
87654321 87654321
IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.
Bit pattern*
—U810—
00000000
—U206—
01110000
—U203—
10001110
—U411—
10111000
Q Q Q Q
87654321 87654321
Bit pattern*
—U810—
00000000
—U206—
01110000
—U203—
10001110
—U411—
10111000
Q Q Q Q
87654321 87654321
Register
—U809— AD_STB
00000000
—U207— MUX_STB
11001111
—U221— R1_STB
11101001
—U406— R2_STB
11101110
Register
—U809— AD_STB
00000000
—U207— MUX_STB
11001111
—U221— R1_STB
11101001
—U406— R2_STB
11101100