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4 Measurement Tutorials
AC Loading Errors
In the AC voltage function, the input of the internal DMM appears as a 1 MΩ resistance in parallel with 150 pF of
capacitance. The cabling that you use to connect signals to the instrument will also add additional capacitance and
loading. The table below shows the approximate input resistance at various frequencies.
Input frequency
100 Hz
1 kHz
10 kHz
100 kHz
For low frequencies:
Additional error for high frequencies:
Where:
F = Input Frequency
R
= Source resistance
S
C
= Input capacitance (150 pF) + Cable capacitance
in
Use low-capacitance cable when measuring high frequency AC signals.
238
Input resistance
700 kΩ
600 kΩ
100 kΩ
10 kΩ
Keysight DAQ970A/DAQ973A User's Guide
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