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Tip 5: Making the Most Accurate Reading - Selecting Range, Managing Internal Offsets
You can make the most accurate ac measurements when the multimeter is at full scale of the selected range. Autoranging typically occurs at 10% and 120% of full scale. This enables you to measure some inputs at full scale on one range and 10% of full scale on the next higher range. The accuracy will be significantly different for these two cases. For highest accuracy, you should use manual range to get to the lowest range possible for the measurement.
Managing Internal offsets due to Temperature Coefficient and Overload Errors
Modern multimeters often use an ac measurement technique that measures and removes internal offset voltages when you select a different function or range. If you leave the multimeter in the same range for an extended period of time, and the ambient temperature changes significantly (or if the multimeter is not fully warmed up), the internal offsets may change. For the 34401A, the temperature coefficient is typically 0.002% of range per °C and is automatically removed when you change functions or ranges. When manual ranging to a new range in an overload condition, the internal offset measurement may be degraded for the selected range. Typically, an additional 0.01% of range error may be introduced. These additional errors are automatically removed when you remove the overload condition and then change functions or ranges.