VOLTCRAFT VC281 TRMS Bedienungsanleitung Seite 55

Proceed as follows to measure alternating currents up to max. 60 A:
- Switch the DMM on and select "
be displayed.
- Insert the red test lead (Y) of the current clamp into the meas-
urement socket
(Y) into the COM measurement socket (H).
- Switch the current clamp on at the operating switch (X). The
current clamp is switched on in the "ON" switch position. The
switch lights up red. The "OFF" position is off.
- Set the display to zero before each DC measurement. To do
this, turn the "DC ZERO" rotary control (T) with the clamp closed
until the display is as close to zero as possible (<0.050 A). The
current clamp is very sensitive thanks to the integrated hall
sensor and should be re-calibrated after each opening of the
current sensor.
It is possible that external influences will prevent the
exact zero position from being set (e.g. 0.038 A etc.). In
this case, the offset error remains linear throughout the
measurement range and can be subtracted from the
measurement. This will not impair the measurement.
- To open the current clamp sensor, press the clamp opening lever (W) and clamp the measurement adapter over
the lead to be measured with the correct polarity.
- Always ensure the correct polarity of the current clamp for direct current measurements. The polarity symbols are
located on the front and back of the current clamp. The cable from the current source (+) must run from the front
through the current clamp to the load.
- Surround the conductor that you want to measure and close the current clamp. Position the conductor in the middle
between the two position symbols on the clamp. When surrounding a conductor, ensure that the clamp sensor is
closed properly, otherwise, measurement errors may occur.
- The measurement will appear on the display.
A minus "-" symbol in front of the measurement indicates that the current is flowing in the opposite direction
(or that the test leads or current sensor are connected with the wrong polarity).
- After measuring, remove the clamp transformer from the measured object and switch both devices off.
A" mode. "A" and "DC" will
(F) of the DMM. Insert the black test lead
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