Measurements Below Full Scale
You can make the most accurate AC measurements when the multimeter is at or near the full scale of the
selected range. Autoranging occurs at 10% (down–range) and 120% (up–range) 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. In
general, the accuracy is better on the lower range; for the highest accuracy, select the lowest manual
range possible for the measurement.
High-Voltage Self-Heating Errors
If you apply more than 300 Vrms, self–heating occurs in the multimeter's internal signal–conditioning
components. These errors are included in the multimeter's specifications. Temperature changes inside the
multimeter due to self–heating may cause additional error on other AC voltage ranges. The additional
error is less than 0.02% and dissipates in a few minutes.
AC Current Measurement Errors (Burden Voltage)
Burden voltage errors, which apply to DC current, also apply to AC current measurements. However, the
burden voltage for AC current is larger due to the multimeter's series inductance and your measurement
connections. The burden voltage increases as the input frequency increases. Some circuits may oscillate
when performing current measurements due to the multimeter's series inductance and your measurement
connections.
Measurement Tutorial
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Keysight True
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Series Operating and Service Guide
