User`s guide

2 Making Measurements
Measuring DC Voltage
42 U1273A/U1273AX User’s Guide
Using the Filter Function for DC measurements
Turn on the Filter Function when measuring DC voltage
and/or current from a mixed signal (AC+DC components) in
the DC voltage measurement mode. See “Enabling the
filter” on page 130 for more information.
The Filter Function blocks and attenuates AC signals to help
you read the DC measurement from a mixed signal. For
instance, a DC offset with an AC voltage signal presence (for
example, AC 100 V/220 V applied to the 3 V range).
The will appear if the Filter is enabled in the
multimeter’s Setup.
Figure 2-6 Filter for DC voltage measurements
WARNING
• To avoid possible electric shock or personal injury, enable the
Filter(LPF) to verify the presence of hazardous DC voltages.
Displayed DC voltage values can be influenced by high frequency
AC components and must be filtered to assure an accurate
reading.
• Do not enable any of the dual display options when performing
measurements to verify the presence of hazardous DC voltages.