Keithley 2001 Repair Manual

Troubleshooting
2-106
Test 409.1 – ÷750 correction factor; circuit setup for
test 409.2
Circuit Exercise
The DAC (U531) is programmed with Ò1sÓ and OUT A is routed to C556. The signal at
BUFF is routed through R233 and applied to NET1 (R557). The signal at pin 4 of NET1
is routed through U526 (DCF pulled low) and Q516, and applied to the input buffer
(Q512 and U520). The buffered signal is tied to AMP IN.
The signal at AMP IN is then routed to Q510 via U522 (SELFTEST1 pull low) and the
x5 inverting ampliÞer (U523, R542 and R533).
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: 1
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: 1
Q2: 1
Q3: 1
Q4: 1
Q5: 1
Q6: 1
Q7: 1
Q8: 1
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

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English