Measurements Below Full Scale You can make the most accurate
ac measurements when the internal
DMM is at full scale of the selected
range. Autoranging occurs at 10% and 120% of full scale. This enables
you to measure some inputs at full scale on one range and 10% of full
scale on the next higher range. Note that the measurement accuracy
will be significantly different for the two cases. For highest accuracy,
you should use manual ranging to select the lowest range possible for
the measurement.
Temperature Coefficient and Overload Errors The internal
DMM
uses an ac measurement technique that periodically measures and
removes internal offset voltages when you select a different function
or range. When manual ranging to a new range in an overload condition,
the internal offset measurement may be degraded for the selected
range. Typically, an additional 0.01% of range error may be introduced.
This additional error will remain until the next periodic removal
(typically 15 minutes).
Chapter 8 Tutorial
Measurement Fundamentals
366
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