User`s guide

Making Measurements 2
Using Z
LOW
for Voltage Measurements
U1273A/U1273AX User’s Guide 49
Using Z
LOW
for Voltage Measurements
The Z
LOW
function in your multimeter presents a low
impedance across the leads to obtain a more accurate
measurement.
To set up your multimeter to make a Z
LOW
(low input
impedance) voltage measurement, first set up your
multimeter to measure voltage as shown in Figure 2- 2 or
Figure 2- 5. Probe the test points, and read the display.
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).
Table 2- 7 Rotary switch positions allowing Z
LOW
measurements
Legend Default function Function when is pressed
Z
LOW
(AC/DC) V -
S
h
i
f
t
V
i
e
w
E
s
c
Z LOW
NOTE
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.
NOTE
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. The Z
LOW
function can
remove ghost voltages from your measurements by dissipating the
coupling voltage. Use the Z
LOW
function to reduce the possibility of false
readings in areas where the presence of ghost voltages are suspected.
Exit
Dual