Keithley 2002 Repair Manual

Troubleshooting
2-22
Test 105.8 — Group Execute Trigger (GET)
Type
Pass/Fail
Fault message
Open IEEE-488 GET
Description
Trigger 8 (STI8) is set up as an input, and the 9914 (U622) is then programmed to generate a
GET signal.
Drawing reference
Digital Board; 2002-140
Components
U618 and U622.
Test 105.11 through 105.18 — Trigger shorts
Type
Pass/Fail
Fault message
None
Description
In test 105.11, STI1 is programmed as the trigger input. Each of the other triggers (STI2 through
STI7 and GET) is programmed to toggle in sequence. If a trigger is detected at STI1, a short is
indicated and the test fails. The test is repeated for STI2 through STI8 in tests 105.12 through
105.18.
Ordinarily, Built-In-Tests should be run with no external connections. However, the Trigger
Shorts tests may be used to verify proper operation at the external trigger bus connector (J1029,
J1030). For example, by shorting pins 1 and 2, tests 105.11 and 105.12 should fail, indicating
that the short was detected between system trigger 1 and system trigger 2.
Drawing reference
Digital Board; 2002-140
Components
J1029, J1030, and associated circuitry.

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