Other Sources Of Measurement Error - Keysight 34450A Guia Del Usuario

3 Measurement Tutorial

Other Sources of Measurement Error

Loading Errors (AC volts)
In the AC voltage function, the input of the multimeter appears as a 1 M
resistance in parallel with 100 pF of capacitance. The cabling that you use to
connect signals to the multimeter also adds capacitance and loading.
For low frequencies, the loading error is:
At high frequencies, the additional loading error is:
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 V
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.
116
, self-heating occurs in the multimeter's internal
rms
Keysight 34450A User's Guide