Keysight U1271A - Using ZLOW for Voltage Measurements (U1272 A Only)

2 Making Measurements
Using Z
LOW
for Voltage Measurements (U1272A only)
68 U1271A/U1272A User’s Guide
Using Z
LOW
for Voltage Measurements (U1272A only)
Use the Z
LOW
(low input impedance) function to remove
ghost or induced voltages from your measurements.
Ghost voltages are voltages present on a circuit that should
not be energized. Ghost voltages can be caused by capacitive
coupling between energized wiring and adjacent unused
wiring.
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.
The Z
LOW
function in your multimeter presents a low
impedance across the leads to obtain a more accurate
measurement.
1 To make a Z
LOW
measurement, rotate the multimeter’s
rotary switch to .
2 Probe the test points and read the display. The AC voltage
measurement is shown in the primary display and the DC
voltage measurement is shown in the secondary display.
Press to exchange the AC and DC voltage indication
on the primary and secondary displays.
CAUTION
Do not use the Z
LOW
function to measure voltages in circuits that could
be damaged by this function’s low impedance (≈2 kΩ).
Z LOW
Exit
Dual