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For this cut off the power supply of the speaker. Set the knob to an amp higher than the amp of what you are measuring.
Clip back the leads to the circuit while touching the insulated part to take the appropriate precautions.
How to measure amps with a voltmeter. Turn the dial to an amp setting thats higher than what youre measuring. Once youve determined the maximum currents youre expecting to test look for a dial on your meter and turn it a little higher than that number. Connect or hold the black lead to the downstream portion of the circuit.
Now restore power to the circuit. The display should show a number. If it starts with a whole number from 1 to 10 youre measuring amps.
If it starts with a zero and a decimal point youre measuring milliamps. Select DC or AC on the multimeter. You need to select the current range you are testing unless the multimeter is intended to use a specific DC or AC circuits.
Always check the plate on the power source if you are not sure of the current to use. Set the knob to an amp higher than the amp of what you are measuring. I show how to test how many amps an electronic device pulls with a standard multimeter.
To get wattage multiply amp x volts. Configure the meter to measure the current at the high-amperage 10A setting. Turn the disconnect switch so that it connects the battery to ground and allows current to flow.
Turn off everything in the carlights radio USB chargers everything. Connect the meter across the battery switch between the negative post and ground. One red jack is responsible for measuring voltage and resistance.
While another red jack is responsible for measuring amps and the last one is responsible for measuring milliamps and microamps. The amperage symbol on the digital multimeter is an uppercase A. The milliamps and microamps are abbreviated as mA and µA respectively.
The black cable should connect to the port Neg Ground on your digital multimeter and also the negative terminal on your car battery. Step 5. Once you turn the multimeter on and set the voltage range properly the multimeter will show the voltage of the battery.
How to read Meter Reading. Testing your battery isnt difficult if you have a multimeter. These handy machines make the process quick and easy.
Follow our tips and youll get good results in just a few minutes. Heres the whole process. How To Test Car Battery Amps With Multimeter Start With Your Multimeter.
The first thing to do is to test your meter. Measure the speakers resistance using a multimeter Test the resistance of the speaker youll be connecting to the amp using a digital multimeter. For this cut off the power supply of the speaker.
Then determine which terminal on the speaker is positive and which is negative. Start with the black lead and then the red lead. Connect the black lead to the COM slot while the pointed side to the mains.
Do the same to the red lead as described in the user manual for your multimeter. Clip back the leads to the circuit while touching the insulated part to take the appropriate precautions. Connect the black jack to the multimeter port labeled COM connect the red one to the port with either A or mA on it and then select an appropriate maximum current on the main dial.
Turn off the circuit you intend to measure make a break in it and then touch the probes to the wires or components at both sides of the break. How you use a voltmeter to measure current is by inserting a current sensing resistor into the circuit and measuring the voltage across that resistor. Furthermore measuring anything over 10 amps could blow a fuse or destroy the multimeter as well.
Your multimeter might have completely separate ports for measuring amps while the other port is specifically just for voltage resistance and continuity but most cheaper multimeters will share ports. The meter must be able to measure the same mode AC or DC amps as the voltage in the circuit otherwise it will indicate 0. Be aware that most multimeters will only measure extremely small amounts of current in the uA and mA ranges.
1 uA is000001 amp and 1 mA is001 amp. How to Measure Amps - electrical service circuit or individual device electrical current usage rate POST a QUESTION or COMMENT about measuring amps or current used by an entire building or by an individual electrical circuit appliance motor or device - Digisnap DSA-500 snap-around digital multimeter from AW. Sperry - photos use advice.
Set the multimeter to measure amperes and attach the multimeter leads in series with the component and the board. Most multimeters are capable of reading up to 10 amps and the inputs have fuses for over-current protection. Step 2 Use a breakout box to provide test points for measurements.
Press each probe to the correct terminal touching negative to negative and positive to positive. Your multimeter and battery are probably both color coded so the negative terminal and probe will be black while the positive terminal and probe are red. Turn on the multimeter.
Check that the jacks on the ends of the two wires to the meter are inserted in the Ah jack sockets on the meter if your meter has several sockets or set it to measure Ah by turning the dial to the appropriate setting or by pressing the Ah button. Refine the Ah setting to a range that fits the Ah on the batterys label.