Making Measurements
2
Keysight U1241C/U1242C User’s Guide
61
Using Z
LOW
for Voltage Measurements (U1242C only)
The low input impedance (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
voltage measurement, first set up your
multimeter to measure voltage as shown in
. 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 k
Ω
).
Table 2-5
Rotary switch position allowing Z
LOW
measurements
Legend
Default function
Z
LOW
(AC/DC) V
Z
LOW
NOTE
The AC voltage measurement is shown in the primary display and the DC
voltage measurement is shown in the secondary display.
NOTE
Use the low input impedance (Z
LOW
) function to remove stray or induced
voltages from your measurements.
Stray (ghost) voltages are voltages present on a circuit that should not be
energized. Stray voltages can be caused by capacitive coupling between
energized wiring and adjacent unused wiring.
Z
LOW
can remove stray 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 stray voltages are suspected.
You can also use Z
LOW
for tripping a residual-current device (RCD) or a
residual-current circuit breaker (RCCB). Z
LOW
can discharge stray voltages from
probes touching on terminals after the RCD or RCCB is tripped. This will prevent
false readings in voltage measurements with high-input impedance after a
power off or trip.
Содержание U1241C
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