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d) Direct Current Measuring “mA/µA DC”
The maximum permissible voltage in the measuring circuit against ground potential must not
exceed 600 V in CAT II and III.
Current measurement always takes place in series with the consumer. Before connecting the meter, the circuit must
be powered down. After the end of measuring, power down the circuit before removing the measuring lines. This
prevents the occurrence of light arcs.
The internal resistance of the meter causes a low voltage drop in the measuring circuit (max. 200 mV) because of
the integrated fuse in the mA measuring range. However, this is usually negligible.
Proceed as follows to measure direct currents (mA/µA DC ) < 200 mA:
- Switch on the DMM by the dial switch (3) and select the corresponding measuring range “mA/µA”.
- Plug the red measuring line into the mA measuring jack (6) and the black measuring line into the COM measuring
jack (5).
- Connect the two measuring prods in series with the consumer. The red measuring prod indicates the positive pole,
the black measuring prod the negative pole. Switch on the measuring circuit.
- The measured value is indicated on the display.
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).
- Power down the measuring circuit after the end of measuring and remove the measuring prods from the measured
object. Switch off the device. Turn the dial switch to “OFF”.
