Keithley 2182 User Manual

Setting line voltage and replacing fuse
A rear panel fuse located next to the AC receptacle protects the power line input of the
instrument. If the line voltage setting needs to be changed or the line fuse needs to be replaced,
perform the following steps:
WARNING Make sure the instrument is disconnected from the AC line and other
equipment before changing the line voltage setting or replacing the fuse.
1. Place the tip of a flat-blade screwdriver into the power module by the fuse holder
assembly (see Figure 1-3). Gently push in and move to the left. Release pressure on the
assembly, and its internal spring will push it out of the power module.
2. Remove the fuse, and replace it with the type listed in Table 1-1.
CAUTION For continued protection against fire or instrument damage, only replace
the fuse with the type and rating listed. If the instrument repeatedly blows
fuses, locate and correct the cause of the trouble before replacing the fuse.
See the Model 2182 Service Manual for troubleshooting information.
3. If configuring the instrument for a different line voltage, remove the line voltage selector
from the assembly and rotate it to the proper position. When the selector is installed into
the fuse holder assembly, the correct line voltage appears inverted in the window.
4. Install the fuse holder assembly into the power module by pushing it in until it locks in
place.
Power-up sequence
On power-up, the Model 2182 performs self-tests on its EPROM and RAM, and momentarily
lights all digit segments and annunciators. If a failure is detected, the instrument momentarily
displays an error message and the ERR annunciator turns on. Error messages are listed in
Appendix B.
NOTE If a problem develops while the instrument is under warranty, return it to Keithley
Instruments Inc., for repair.
If the instrument passes the self-tests, the firmware revision levels are displayed. For
example:
REV: A01 A02
where: A01 is the main board ROM revision.
A02 is the display board ROM revision.
After the power-up sequence, the instrument begins its normal display of readings.
Table 1-1
Fuse ratings
Line Voltage Fuse Rating Keithley P/N
100/120V 0.25A, slow-blow, 5x20mm FU-96-4
220/240V 0.125A, slow-blow, 5x20mm FU-91
Getting Started 1-15

Keithley 2182 Specifications

General

Brand	Keithley
Model	2182
Category	Measuring Instruments
Language	English