148 34410A/11A/L4411A User’s Guide
5 Specifications
Interpreting Accuracy Specifications
Transfer Accuracy
Transfer accuracy refers to the error introduced by the multimeter due to noise and
short–term drift. This error becomes apparent when comparing two nearly–equal signals
for the purpose of "transferring" the known accuracy of one device to the other.
24–Hour Accuracy
The 24–hour accuracy specification indicates the multimeter's relative accuracy over its
full measurement range for short time intervals and within a stable environment.
Short–term accuracy is usually specified for a 24–hour period and for a ±1 °C
temperature range.
90–Day and 1–Year Accuracy
These long–term accuracy specifications are valid at the calibration temperature (T
cal
) ±
5 °C temperature range. These specifications include the initial calibration errors plus
the multimeter's long–term drift errors.
Temperature Coefficients
Accuracy is usually specified at the calibration temperature (T
cal
) ± 5 °C temperature
range. This is a common temperature range for many operating environments. You must
add additional temperature coefficient errors to the accuracy specification if you are
operating the multimeter outside the ± 5 °C temperature range (the specification is per
°C).
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