Appendix A: Maintenance
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
A-4
077114601 / March 2019
10. Select the type of upgrade you want to perform:
To upgrade to a newer version of firmware: Select
New
and press the
ENTER
key.
To return to a previous version of firmware: Select
Previous
and press the
ENTER
key.
A message is displayed while the upgrade is in progress.
11. When the upgrade is complete, reboot the instrument.
Perform DIN VDE 701 test
The following procedure is intended only for qualified service personnel. This procedure may
expose you to hazardous voltages that could result in personal injury or death. Do not
attempt to perform these procedures unless you are qualified to do so.
Since the 2281S series of instruments have overvoltage protection built in, you should perform an
isolation resistance test within a DIN VDE 701 test at 250 volts using a Fluke 6500-2, or equivalent.
Cleaning the front-panel display
Inspect the power supply as often as operating conditions require.
To clean the exterior surface:
1. Remove loose dust on the outside of the power supply with a lint-free cloth. Use care to avoid
scratching the display.
2. Use a soft cloth dampened with water to clean the power supply. Use an aqueous solution of
75% isopropyl alcohol for more efficient cleaning.
To avoid damage to the surface of the power supply, do not use any abrasive or chemical
cleaning agents.
