Keithley 2651A Reference Manual page 702

Appendix B: Calibration
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 18º C to 28º C assume adjustment has been done at 23º C. If
the Model 2651A is adjusted at a different temperature, the specifications apply to +/-5º C of that
adjustment temperature.
Line power
The Model 2651A 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.
Warm-up period
Allow the Model 2651A to warm up for at least two 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 a unit 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.
Recommended verification equipment
The following table summarizes recommended maximum allowable test equipment uncertainty for
verification points. Total test equipment measurement uncertainty should meet or be less than the
listed values at each test point. Generally, test equipment uncertainty should be at least four times
better than corresponding Model 2651A specifications.
Description
Digital multimeter
B-2
Model 2651A High Power System SourceMeter® Instrument Reference Manual
NOTE
Manufacturer/model Accuracy
DC voltage 50 mV: ±1500 ppm
90 mV: ±880 ppm
0.5 V: ±200 ppm
0.9 V: ±130 ppm
5 V: ±200 ppm
9 V: ±130 ppm
10 V: ±170 ppm
18 V: ±110 ppm
20 V: ±200 ppm
36 V: ±130 ppm
2651A-901-01 Rev. A / March 2011