Measuring Current - VOLTCRAFT VC-740E AC Bedienungsanleitung

e) Measuring current
Never exceed the maximum permitted input values. Never touch circuits or circuit components if
they may carry voltages greater than 33 V/ACrms or 70 V/DC. This may cause a fatal electric shock!
Do not measure current on a circuit with a voltage of more than 600 V in CAT IV.
Pay attention to the necessary safety information, regulations and protective measures for your
own safety.
The current is measured via the current clamp (1). The sensors in the current clamp detect the magnetic field created
by current-carrying conductors. You can take measurements on insulated and uninsulated conductors. Always ensure
that the conductor passes through the centre of the current clamp (pay attention to the arrow marks) and that the
clamp is closed.
Do not use the current clamp to surround more than one conductor. If the
supply and return conductors (e.g. L and N) are measured, the currents will
cancel each other out and no measurement will be displayed. If several sup-
ply conductors (e.g. L1 and L2) are measured, the currents will be added
together.
At low currents, the conductor can be wound around one side of the current
clamp to increase the total measured current. To obtain the correct current
value, divide the measured current by the number of coils.
Measuring alternating currents (A
- Turn on the multimeter using the control knob (16) and select "A
" mode. "A" and the AC symbol AC will appear on the display.
- The display is automatically set to zero when the current clamp is
closed. If there is a strong magnetic field that affects the reading,
use the relative value function ("REL").
- Press the opening lever (4) to open the current clamp.
- Surround the conductor that you want to measure and close the
current clamp. Position the conductor in the middle between the
two markings on the clamp.
- The measured current is indicated on the display.
After measuring, remove the current clamp from the measured ob-
ject and turn the multimeter off (turn the control knob to the "OFF"
position).
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