Accuracy, The Limits Of Errors; General - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

1693 RLC Digibridge
NOTE: Table 3-6 differs slightly from the table of
typical measurement times given in the Specifications
at the front of this manual (and data in paragraphs
3.5.1, 3.5.2, 3.5.5), although the tables are reason-
ably accurate. The differences underscore that these
"typical" numbers are not specifications and that
several test conditions and selections in addition to
those stated for the tables affect measurement time.
For example, selections of parameter and equivalent
circuit affect calculation time.

3.6 Accuracy, The Limits of Errors

3.6.1 General

Refer to the Specifications, at the front of this manual.
The specifications apply at an ambient temperature
of 23 degrees C (unless recalibration has been done
at some other temperature), in low humidity, if the
OPEN and SHORT zeroing procedures have been
executed properly (paragraph 3.1.3), and the quick-
acquisition feature is NOT selected. These speci-
fications are valid when autoranging is used or the
option range is set and held. When a non-optimum
range is set and held, the accuracy may decrease (see
paragraph 3.6.9).
52
Typical accuracy is described below, for convenience
in obtaining a birds-eye view of the way it relates to
the principal test conditions, instrument program-
ming, averaging, and median-value selection.
Refinement of the zeroing procedure to enhance ac-
curacy for certain kinds of measurements is described
in paragraphs 3.6.5 and 3.6.6. Cable-related errors
and their correction are described in paragraph 3.6.7.
Paragraph 3.6.8 describes the use of signal reversing
(a special function) to enhance accuracy whenever
test frequency is the same as power-line frequency.
To obtain accuracy, and the limits of errors, IET of-
fers a convenient tool at http://www.ietlabs.com/
product_support/limits_of_error_calculator. This
tool is equivalent to the calculation below for both
primary and secondary parameters.
Operation