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Using the LPF (Low Pass Filter) Function for AC measurements
Your multimeter is equipped with an AC low pass filter to help reduce unwanted
electronic noise when measuring AC voltage or AC frequency.
1 Rotate the multimeter's rotary switch to
2 Press
Figure 2-3
– To avoid possible electric shock or personal injury, do not use the Low
WARNING
– First, make an AC voltage measurement with the filter OFF to detect the
The low pass filter can improve measurement performance on composite sine
waves that are typically generated by inverters and variable frequency motor
drives.
Keysight U1271A/U1272A User's Guide
to activate the low pass filter function (
continues measuring in the chosen AC mode, but now the signal diverts
through a filter that blocks unwanted voltages above 1 kHz.
AC voltage with LPF display
Pass Filter option to verify the presence of hazardous AC voltages. AC
voltage values greater than what are indicated may be present when the
Low Pass Filter is enabled.
possible presence of hazardous voltages. Then, select the filter function if
required for measurement stability and response speed.
Making Measurements
/
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). Your multimeter
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