Keysight Technologies U1273A Guide De L'utilisateur page 57

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.
Table 2-2 Rotary switch positions allowing AC voltage measurements with LPF
Legend Defaul t function
AC V
AC mV
Set up your multimeter to measure AC voltage as shown in
chosen AC mode, but now the signal diverts through a filter that blocks unwanted
voltages above 1 kHz. Probe the test points, and read the display.
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
Keysight U1273A/U1273AX User's Guide
to activate the LPF option. Your multimeter continues measuring in the
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
is pressed
Function when
AC V with LPF
AC mV with LPF
Figure 2-2. Press
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