iET PRS-300 Series, Руководство по эксплуатации, Страница: 41 / 50

PRS-DMM SOFTWARE
PRS-300 Series
31
9.3.5 PRS-DMM Speed
There are three selections for PRS-DMM
Speed. These selection affect the accuracy from
the target value and time to make the measure-
ments.
Slow measurements are made with 7 ½
digits of resolution, and measurements and ad-
justments are made until the accuracy is better
than ±20 ppm.
Medium measurements are made with 6
½ digits of resolution and measurements and
adjustments are made until the accuracy is better
than 40 ppm.
Fast measurements are made with 6 ½ digits
of resolution. There are no adjustments made
in fast mode. The value from the DMM is just
displayed.
The uncertainty of the measurement is also
displayed. The uncertainty is based upon the
speci
fi cations given in the manual for the Fluke
8508A or Agilent 3458A. The uncertainty is
based upon either 6 ½ or 7 ½ digits of resolution,
absolute uncertainty for 365 days and a 95%
con
fi dence level.