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GMC-I Messtechnik GmbH
9
Current Measurement
Attention!
!
First of all, disconnect the power supply from the mea-
suring circuit and/or the load and discharge any capac-
itors that might be present.
1 Select function A with the function selector switch for cur-
rents > 400 mA or function mA for currents < 400 mA.
For measuring currents of an unknown quantity, select the high-
est measuring range first
.
2 Select the function corresponding to the measured quan-
tity by briefly pressing the yellow multifunction key. Each
time the key is pressed, alternate switching takes place
between AC and DC, and changeover is acknowledged by
an acoustic signal. The symbols DC and AC indicate the
selected current type on the LCD.
After selection of this function with the selector switch, the cur-
rent type DC is always activated.
3 Connect the measuring instrument in series to the load as
shown (without contact resistance).
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 600 V.
•
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.
•
Current ranges up to 400 mA are protected with a
FF1.6 A / 1000 V fuse.
•
In the 400 mA measuring range an intermittent acoustic
signal warns you if the measured value has exceeded the
measuring range upper limit value.
