Verification Test Requirements - Keithley 2657A Reference Manual

Appendix B: Calibration

Verification test requirements

Be sure that you perform the verification tests:
•
Under the proper environmental conditions.
•
After the specified warm-up period.
•
Using the correct line voltage.
•
Using the proper test equipment.
•
Using the specified output signal and reading limits.
Product specifications are subject to change. Listed uncertainties and test limits are provided only as
examples. Always verify values against actual product specifications.
Environmental conditions
Conduct your performance verification procedures in a test environment with:
•
An ambient temperature of 18 °C to 28 °C (65 °F to 82 °F).
•
A relative humidity of less than 70 percent unless otherwise noted.
Product specifications that are listed as 18 ºC to 28 ºC assume adjustment has been done at 23 ºC. If
the Model 2657A High Power System SourceMeter
the specifications apply to ±5 ºC of that adjustment temperature.
Line power
The Model 2657A requires a line voltage of 100 V to 240 V and a line frequency of 50 Hz or 60 Hz.
Verification tests should be performed within this range.
Warmup period
Allow the Model 2657A High Power System SourceMeter
hours before conducting the verification procedures.
If the instrument has been subjected to temperature extremes (those outside the ranges stated
above), allow additional time for the instrument's internal temperature to stabilize. Typically, allow one
extra hour to stabilize an instrument that is 10 °C (18 °F) outside the specified temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the manufacturer.
B-2
Model 2657A High Power System SourceMeter® Instrument Reference Manual
NOTE
NOTE
®
instrument is adjusted at a different temperature,
®
instrument to warm up for at least two
2657A-901-01 Rev. B/December 2012