User`s guide

U1273A/U1273AX Handheld Digital Multimeter
Performing Measurements and Tests
8 U1273A/U1273AX Quick Start Guide
LPF measurements:
• Passing the measured signal through a LPF help blocks
unwanted voltages such as electronic noise.
• Use the LPF function to improve measurement on compos-
ite sine waves that are typically generated by inverters and
variable frequency motor drives.
Z
LOW
measurements:
• Use the Z
LOW
(low input impedance) function to remove
ghost or induced voltages from your measurement.
• Z
LOW
can remove ghost voltages from your measurements
by dissipating the coupling voltage. Use Z
LOW
to reduce the
possibility of false readings in areas where the presence of
ghost voltages are suspected.
Press while performing ac
voltage measurements to pass the
measured signal through a low pass
filter.
Rotate the rotary switch’s position to
to enable low impedance mea-
surements.
S
h
i
f
t
V
i
e
w
E
s
c
Z LOW