Keithley 2182, Руководство по обслуживанию, Страница: 46 / 120

Perform the following steps to replace the line fuse:
1. Carefully pry the locking tab that secures the fuse carrier to the power module.
2. Pull out the fuse carrier, and replace the fuse with the type specified in Table 3-1 .
CAUTION To prevent instrument damage, use only the fuse type specified in Table 3-1 .
3. Re-install the fuse carrier.
NOTE If the power line fuse continues to blow, a circuit malfunction exists and must be
corrected. Refer to the troubleshooting section of this manual for additional
information.
Line voltage selection
WARNING Disconnect the line cord at the rear panel, and remove all test leads and
cables connected to the instrument (front and rear) before changing the line
voltage.
The Model 2182 can be set to operate on either 100V, 120V, 220V, or 240V nominal line
voltages. You can change the line voltage as follows:
1. Carefully pry the locking tab that secures the fuse carrier to the power module.
2. Pull out the fuse holder from the carrier.
3. If you are changing the line voltage that requires a different fuse, replace it with the
correct type. (See
Table 3-1 ).
4. Rotate the fuse holder so that the desired line voltage setting will be displayed in the
small window in the carrier, then install the holder in the carrier.
5. Install the fuse carrier in the power module, and make sure the locking tab secures it
properly.
Table 3-1
Power line fuse ratings
Line voltage Rating Keithley part no.
100-120V 250V, 0.25A, Slow Blow 5 X 20mm FU-96-4
200-240V 250V, 0.125A, Slow Blow 5 X 20mm FU-91
Routine Maintenance 3-3