Keithley 2002 Repair Manual

Troubleshooting
2-99
Test 412.5 — Frequency, phase 5
Type
Circuit Exercise
Fault message None
Description This test uses the same setup as test 412.1 except that the SELFTEST line is toggled to make
Q425 switch. Tests 412.4 and 412.5 are repeated 85 times. The switching is read as a frequency.
Drawing reference Analog Board; 2002-100
A/D Converter; 2002-160
Bit patterns
Test 412.6 — Frequency, phase 6
Type
Circuit Exercise
Fault message None
Description This test uses the same setup as test 412.1 except that shift register U811 on the A/D board sets
up the U816 ASIC to finish reading frequency.
Drawing reference Analog Board; 2002-100
A/D Converter; 2002-160
Bit patterns
Bit pattern* Register
—U400—
01001100
—U811—
00001000
—U224—
00010111
—U432—
11001010
—U810—
00000000
—U206—
01110000
—U203—
10001110
—U411—
10111000
—U809—
00000000
—U207—
11001111
—U221—
11101001
—U406—
11101100
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—
01001100
—U811—
00001001
—U224—
00010111
—U432—
11001010
—U810—
00000000
—U206—
01110000
—U203—
10001110
—U411—
10111100
—U809—
00000000
—U207—
11001111
—U221—
11101001
—U406—
11101100
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