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GMC-I Messtechnik GmbH
10
Current Measurement
•
First disconnect the power supply to the circuit being mea-
sured and/or to the load, and discharge all capacitors
within that circuit.
•
With the function selector switch (6), select A for currents
> 660 mA and mA for currents
≤
660 mA. When measur-
ing current of unknown magnitude, select the highest mea-
suring range first.
•
Select the function corresponding to the measured quan-
tity by briefly pressing the yellow multi-function (5) pushbut-
ton.
•
Each time the pushbutton is pressed, alternate switching
takes place between DC and AC. The change-over is
acknowledged by an acoustic signal.
•
The symbols DC and AC (21) are displayed as per selected
function on the LCD.
•
When selecting a range with the function selector switch
(6), the DC function is always set by default.
•
Connect the multimeter in series with the load, as shown.
Ensure that the connections are tight (with least resis-
tance).
Notes on current measurement
•
The multimeter must be used only in the power systems,
where the current circuit is protected by a fuse or a circuit
breaker of 20 A, and when the nominal voltage of the sys-
tem does not exceed 1000 V AC/DC.
•
Carefully secure the measuring circuit connections by
mechanical means so that they do not accidentally open.
The conductor cross sections and connection points
should be designed so as to avoid excessive heating.
•
The current measuring ranges up to 660 mA are protected
against a short circuit current of 25 A by a 1.6 A/
1000 V AC/DC fuse in conjunction with power diodes.
