Keithley 2002 Getting Started Manual page 85

4-2 Specs and Accessories
Specifications
The following pages contain the condensed specifications for the 2002. Every effort has been
made to make these specifications complete by characterizing its performance under the variety
of conditions often encountered in production, engineering, and research.
The 2002 provides transfer, 24-hour, 90-day, 1-year, and 2-year specifications, with full spec-
ifications for the 90-day, 1-year, and 2-year intervals. This allows the operator to utilize 90-day,
1-year, or 2-year recommended calibration intervals, depending upon the level of accuracy de-
sired. As a general rule, the 2002's 2-year performance exceeds a 6 -digit DMM's 90-day, 180-
day, or 1-year specifications.
Absolute accuracy
All DC specifications are given as relative accuracies. To obtain absolute accuracies, the ab-
solute uncertainties of the calibration sources must be added to the relative accuracies. The ab-
solute uncertainties for the calibration sources used during Keithley's factory calibration are
included in the specifications. The uncertainties of the operator's sources may be different.
All AC specifications are given as absolute accuracies.
Typical accuracies
Accuracy can be specified as typical or warranted. All specifications shown are warranted un-
less specifically noted. Almost 99% of the 2002's specifications are warranted specifications. In
some cases it is not possible to obtain sources to maintain traceability on the performance of ev-
ery unit in production on some measurements (e.g., high-voltage, high-frequency signal sources
with sufficient accuracy do not exist). These values are listed as typical.