24-Hour Accuracy
The 24-hour accuracy specification indicates the internal DMM’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 internal DMM’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 1 Specifications
Interpreting Internal DMM Specifications
30
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