Just remember that when the meter is set to volts, it measures the voltage between two points and when set to amps, it measures the current flowing between the two points. If your multimeter reads close to zero, the range is set too high for a good measurement. This is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. Image 2 - An Open Circuit When the probes are touched together, the circuit is closed and the multimeter indicates this with the needle swinging to the other end of the scale to indicate near 0 resistance, as seen in Image 3.
We partner with Say Media to deliver ad campaigns on our sites. Touch one test probe from the multimeter to the hot wire terminal on the circuit breaker that leads to the appliance in the house.
Turn the dial on the meter to the highest current range or the 10A range if the probe is in the 10A socket. Featured articles. If measuring mains currents, precautions must be taken, including but not limited to the following: Power up the equipment.
First check the meter reads 0 volts with the probes touched together to confirm there isn't a fault causing it to display an offset voltage. Maintain the first test probe at the hot wire terminal of the circuit. Zero the meter: This is important as there may be other resistors or other components having resistance, in parallel with the component being measured.
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The range can be adjusted if necessary. When measuring current, a meter usually has two current sockets. Plug the black ground probe lead into the COM socket on the meter see photo below.
The mA socket is often marked with the maximum current and if you estimate that the current will be greater than this value, you must use the 10 A socket, otherwise you will end up blowing a fuse in the meter.