Keithley 2002 Repair Manual

1
Routine Maintenance
1-1
1.1 Introduction
The information in this section deals with routine type main-
tenance that can be performed by the operator. This informa-
tion is arranged as follows:
1.2 Line fuse replacement: Explains how to replace a
blown line power fuse.
1.3 Current fuse replacement: Explains how to replace a
blown current fuse.
1.4 Fan filter cleaning: Explains how to remove and clean
the filter element for the cooling fan.
1.5 Firmware updates: Recommends a course of action
for firmware updates provided by Keithley.
1.2 Line fuse replacement
WARNING
Disconnect the line cord at the rear pan-
el and remove all test leads connected to
the instrument (front and rear) before
replacing the line fuse.
The power line fuse is accessible from the rear panel, just be-
low the AC power receptacle (see Figure 1-1). Perform the
following steps to replace the line fuse:
1. Insert a bladed screwdriver into the slot of the fuse car-
rier.
2. While pushing in, turn the screwdriver counter-clock-
wise until the spring-loaded fuse carrier releases from
the fuse holder.
3. Pull out the fuse carrier and replace the fuse with the
type specified in Table 1-1.
CAUTION
To prevent instrument damage, use only
the fuse type specified in Table 1-1.
4. Re-install the fuse carrier.
NOTE
If the power line fuse continues to blow, a
circuit malfunction exists and must be cor-
rected. Refer to the troubleshooting sec-
tion of this manual for additional
information.
Table 1-1
Power line fuse
Size Rating Keithley Part No.
5 × 20mm 250V, ½ A, Slo-Blo FU-71

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