34410A/11A/L4411A User’s Guide 141
Specifications 5
Interpreting Accuracy Specifications
Tran s fe r A c curacy
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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