C) Current Measuring "A - VOLTCRAFT VC275TRMS Bedienungsanleitung

c) Current Measuring "A"

Do not exceed the maximum permitted input values. Do not touch any circuits or parts of circuits
if they may be subject to voltages higher than 33 V ACrms or 70 V DC! Danger to life!
The voltage in the measuring circuit must not exceed 600 V.
Measuring >5 A must only be performed for max. 10 seconds and at 15 minute intervals.
Never measure any currents above 10 A in the 10A range and no currents above 600 mA in the
mA/µA range; otherwise the fuses trigger.
The integrated PTC fuses (PTC = thermistor) in the µA/mA-range heat up at extended measuring
operation and thus limit the current flow during measurement. Therefore, perform the current
measurement as quickly as possible to use this PTC effect.
When the PTC-fuse has been tripped in the mA/µA-range (no measured value change, display
"OL", etc.), switch off the circuit and the DMM (OFF). Wait for approx. 5 minutes. The self-resetting
fuse cools off and is then functional again.
Always start current measurements at the highest measurement range and switch down to lower ranges if neces-
sary. Before changing the measurement range, always power down the circuit. All current measuring ranges are
secured with fuses and thus protected against overload.
Proceed as follows to measure direct currents (A
- Switch on the DMM and select measuring range "A".
- The table shows the different measuring functions and possible measuring ranges. Select your measuring range
and the respective measuring jacks.
Measuring Measuring
function range
A
<10 A
mA <600 mA
µA <6000 µA
- Insert the red measuring line into the 10A or mAµA measuring jack. Plug the black
measuring line into the COM jack.
- Connect the two measuring prods in series with the object to be measured (battery,
circuit, etc.); the display indicates the polarity of the measured value together with the
currently measured value.
When a minus "-" appears in front of the measured value when measuring direct
current, the current has the opposite direction (or the measuring lines have been
swapped).
- Remove the measuring lines from the object to be measured after completion of the
measurement and switch off the DMM.
):
Measuring jacks
COM + 10A
COM + mAµA
COM + mAµA
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