Mastech M-830B DC Current

The Mastech M-830B is capable of measuring DC currents up to 10-amperes. The ranges for current measurements have the markings "200 m", "20 m", "2000 µ", and "200 µ". If you want to measure larger currents up to 10-amperes, then you need to connect the red test lead to the socket marked "10ADC". It is worth remembering that the 200 µA, 2000 µA, 20 mA, 200 mA ranges have a fuse protection with a 250 mA / 250 V quick-blow fuse. If you pass a current greater than 250 mA through it then the fuse will blow.

The 10 A DC setting is not fuse protected, and passing more than 10-amperes through it will damage the meter. When measuring large currents in this range, the test lead must not remain connected for more than 15-seconds.

DC Current Measurement

This meter provides very accurate measurement of small DC currents, and in this example, I am measuring the current in a battery through a load resistor. Current is the flow of electrons through a circuit, therefore it is measured in series with a load. When the meter is set to measure DC current, you must NEVER connect it directly to a voltage source, as it will damage the meter and the voltage source. Current measurements are always in series through a series load.

Accuracy

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