Warmup Period; Line Power; Calibration Considerations; Calibration Cycle - Tektronix Keithley 2281 Series Reference Manual

Appendix C: Calibration and adjustment

Warmup period

Allow the 2281S to warm up for at least one hour before performing calibration.
If the instrument has been subjected to temperature extremes (those outside the ranges stated in

Environmental conditions

stabilize. Typically, you need to allow one extra hour to stabilize an instrument that is 10 °C outside
the specified temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the manufacturer.

Line power

The 2281S requires a line voltage of 100 V, 120 V, 220 V, or 240 V, and a line frequency of 50 Hz or
60 Hz.
Before powering up the instrument, properly set the 100 V/120 V or 220 V/240 V selector switch
located on the rear panel to the appropriate line power position.

Calibration considerations

When performing calibration procedures:
Make sure that the equipment is properly warmed up.
Make sure to use the 4-wire sense connection with shunt during the current calibration process to
guarantee the accuracy.
If an error occurs during a calibration, the 2281S generates an appropriate error message. See
Error summary

Calibration cycle

Perform calibration at least once a year to ensure the instrument meets the corresponding
specifications.
C-2
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
(on page C-1)), allow extra time for the instrument's internal temperature to
(on page 8-3) for more information.
077114601 / March 2019