In this appendix:
Introduction ............................................................................... A-1
Line fuse replacement .............................................................. A-1
Upgrading the firmware ............................................................ A-2
Perform DIN VDE 701 test ....................................................... A-4
Cleaning the front-panel display ............................................... A-4
Introduction
The information in this section describes routine maintenance of the instrument that can be performed
by the operator.
Line fuse replacement
A fuse located on the Model 2281S-20-6 rear panel protects the power line input of the instrument.
Disconnect the line cord at the rear panel and remove all test leads connected to the
instrument before replacing the line fuse. Failure to do so could expose the operator to
hazardous voltages that could result in personal injury or death.
Use only the correct fuse type. Failure to do so could result in injury, death, or instrument
damage.
Choose the right fuse with mechanical characteristics described in the following table.
Model
100 VAC/120 VAC source
220 VAC/240 VAC source
2281S
250 V, 5 A, Time delay
250 V, 2.5 A, Time delay
To replace the fuses, you will need a small flat-bladed screwdriver.
Appendix A
Maintenance
