Keithley 2002 Repair Manual

Troubleshooting
2-77
Components U403, U408, U412, U414, U417, U419, U430, U433, and associated components.
Bit patterns
Test 405.5 — Small negative DAC V for X10 gain comparison
Type
Circuit Exercise
Fault message None
Description DAC U433 and op amp pair U430 are set up to generate -0.210 VDC at PRECOMP+. This signal
follows the same path as test 405.1. This test has the same purpose as test 405.1, but the new test
value is used for test 405.6.
Drawing reference Analog Board; 2002-100
Bit patterns
Bit pattern* Register
—U400—
01011100
—U811—
00001101
—U224—
00010111
—U432—
10000101
—U810—
00000011
—U206—
01110000
—U203—
10001110
—U411—
11111111
—U809—
11100111
—U207—
11001111
—U221—
11101001
—U406—
01001111
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.
Bit pattern* Register
—U400—
01011011
—U811—
00001101
—U224—
00010111
—U432—
01111011
—U810—
00000011
—U206—
01110000
—U203—
10001110
—U411—
11011111
—U809—
11100111
—U207—
11001111
—U221—
11101001
—U406—
01001111
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.

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A