Keithley 2001 Repair Manual

2
Troubleshooting
2-1
WARNING
The information in this section is in-
tended for qualiÞed service person-
nel. Some of these procedures may
expose you to hazardous voltages. Do
not perform these hazardous proce-
dures unless you are qualiÞed to do
so.
2.1 Introduction
This section of the manual will assist you in trouble-
shooting the Model 2001. Included are self-tests, test
procedures, troubleshooting tables and circuit descrip-
tions. It is left to the discretion of the repair technician
to select the appropriate tests and documentation
needed to troubleshoot the instrument.
This section is arranged as follows:
2.2 Repair considerations  Covers some consider-
ations that should be noted before making any re-
pairs to the Model 2001.
2.3 Power-on test Ñ Describes the tests that are per-
formed on its memory elements every time the
instrument is turned on.
2.4 Front panel tests Ñ Provides the procedures to
test the functionality of the front panel keys and
the display.
2.5 Built-In tests Ñ Provides the procedures to test
and exercise the various circuits on the digital
board, analog board and A/D converter boards.
2.6 Diagnostics Ñ Explains how to use the Diagnos-
tics test mode of the Model 2001. In general, Di-
agnostics locks-up the instrument in various
states of operation. With the instrument in a static
state, you can then check the state of the various
logic levels on the control registers and signal
trace through the unit.
2.7 R1_STB and R2_STB registers Ñ Provides shift
register bit patterns for the basic measurement
functions and ranges.
2.8 Display board checks Ñ Provides display board
checks that can be made if Front Panel Tests fail.
2.9 Power supply checks Ñ Provides power supply
checks that can be made if the integrity of the
power supply is questioned.
2.10 Documentation Ñ Provides support documen-
tation for the various troubleshooting tests and
procedures. Included is some basic circuit theory
for the display board and power supply, and sup-
port documentation for Built-in Test.
2.2 Repair considerations
Before making any repairs to the Model 2001, be sure to
read the following considerations.

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English