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Direct current measurement

Place the black probe into the “COM” jack. For the

current to be measured not exceeding 220mA, put the

red one into the “V..mA” jack. For current to be

measured between 220mA and 10A, insert the red

probe into 10A jack.

Set the function/range switch to the desired A~ range,

and connect the probe in series with the load to be

measured. The current value and the polarity connected

to the red probe will be shown on the display.

Notice

1. If you do not know the measured voltage range in advance,

set the function/range switch to the maximum range, and

then gradually turn to smaller ranges until satisfactory

resolution.

2. If the display shows “1”, this indicates an overrange

measurement, and the switch should be set to a higher

range.

3. The symbol “ ” beside the probe indicates the

maximum input current is 200mA or 10A, depending on

the inserted jack. Overcurrent will blow the fuse.

Notice

1. If you do not know the measured voltage range in advance,

set the function/range switch to the maximum range, and

then gradually turn to smaller ranges until satisfactory

resolution.

2. If the display shows “1”, this indicates an overrange

measurement, and the switch should be set to a higher

range.

3. Do not input a voltage of more than 600V, it is capable of

indicating a higher voltage, but with the risk of damaging the

inside circuit.

4. When taking the measurement of high voltage, pay special

attention to avoid an electric shock.

Mastech MAS830B User Manual

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