HP 34970A 24-HourAccuracy, 90-Dayand 1-YearAccuracy, Temperature Coefficients

Chapter 9 Specifications

Interpreting Internal DMM Specifications

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 internal DMM outside a 23 °C ± 5 °C temperature range (the specification is per °C).

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