Keysight U1271A Guia Del Usuario página 65

Using the LPF (Low Pass Filter) Function for AC+DC measurements
Your multimeter is equipped with an AC low pass filter to help reduce unwanted
electronic noise when measuring a mixed signal.
1 Enable the LPF (You may refer to
2 Rotate the multimeter's rotary switch to
3 Your multimeter continues measuring in the AC+DC mode, but now the signal
Figure 2-8
Keysight U1271A/U1272A User's Guide
page 131).
diverts through a filter that blocks unwanted voltages above 1 kHz
Low Pass Filter(LPF) for AC+DC voltage measurements
Making Measurements
"Enabling and disabling the Filter"
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