HP 34401A, User Manual

Page: 227 / 236

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 for a 23°C
±
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 for a 23°C
±
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 a 23°C
±
5°C
temperature range (the specification is per °C).
Chapter 8 Specifications
Interpreting Multimeter Specifications
228