Keithley 2001 - Page 123

Troubleshooting
2-110
Test 409.5 – ÷750 correction factor; signal stored
for test 409.6
Circuit Exercise
The SELFTEST control line turns on Q518 driving pin 4 of NET1 (R557) to ground. At
the same time, the SELFTEST control line and multivibrator U503 generates a pulse
that turns on Q510 allowing the signal to be stored on C529. No measurement is made
during this test.
DC_STB
Registers
R1_STB
Registers
R2_STB
Registers
U801 Q1: 0
Q2: 1
Q3: 1
Q4: 1
Q5: 1
Q6: 0
Q7: 0
Q8: 0
U307 Q1: 1
Q2: 1
Q3: 0
Q4: 1
Q5: 1
Q6: 1
Q7: 1
Q8: 1
U505 Q1: 0
Q2: 0
Q3: 1
Q4: 1
Q5: 0
Q6: 1
Q7: 1
Q8: 0
U800 Q1: 1
Q2: 1
Q3: 0
Q4: 0
Q5: 0
Q6: 0
Q7: 1
Q8: 1
U305 Q1: 1
Q2: 0
Q3: 1
Q4: 0
Q5: 0
Q6: 0
Q7: 1
Q8: 1
U500 Q1: 0
Q2: 1
Q3: 0
Q4: 1
Q5: 1
Q6: 1
Q7: 0
Q8: 0
U300 Q1: 1
Q2: 1
Q3: 1
Q4: 1
Q5: 1
Q6: 1
Q7: 1
Q8: 1
U302 Q1: 1
Q2: 1
Q3: 1
Q4: 1
Q5: 1
Q6: 1
Q7: 1
Q8: 0
U530 Q1: 0
Q2: 0
Q3: 0
Q4: 0
Q5: 0
Q6: 0
Q7: 0
Q8: 0
U303 Q1: 0
Q2: 1
Q3: 1
Q4: 1
Q5: 0
Q6: 1
Q7: X
Q8: X
U501 Q1: 1
Q2: 0
Q3: 1
Q4: 1
Q5: 1
Q6: 1
Q7: X
Q8: X
Note: Tables 2-10 through 2-12 provide functional descriptions of the register bits.
Type
Description
Bit pattern