Keysight U1231A - Using VZ LOW for Voltage Measurements; Figure 2-5 VZ LOW Voltage Display

2 Making Measurements
Using VZ
LOW
for Voltage Measurements
36 U1231A/U1232A/U1233A User’s Guide
Using VZ
LOW
for Voltage Measurements
Set up your multimeter to make a VZ
LOW
(low input
impedance) voltage measurement as shown in
Figure 2- 6.
Probe the test points and read the display.
Figure 2-5 VZ
LOW
voltage display
CAUTION
Do not use the VZ
LOW
function to measure voltages in circuits that
could be damaged by this function’s low impedance (≈3 kΩ).
NOTE
Use the VZ
LOW
function to remove ghost or induced voltages from your
measurements
Ghost voltages are voltages present on a circuit that should not be
energized. They are usually caused by capacitive coupling between
energized wiring and adjacent unused wiring. The VZ
LOW
function can
remove ghost voltages from your measurements by dissipating the
coupling voltage. Use the VZ
LOW
function to reduce the possibility of false
readings in areas where the presence of ghost voltages are suspected.
NOTE
During VZ
LOW
measurements, the multimeter’s range is locked to 600 V.
The analog bar graph represents the AC+DC voltage value combined.