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A+
Multimeters Tutorial
A+ Certification Essentials - MultimetersTutorial
You might be called upon to measure some aspect of electricity, such as the voltage level output by a power supply. When you do so, make sure to follow common sense safety precautions.
Multimeters
A meter that can be used to measure multiple electrical properties is called a multimeter. Multimeters are available in digital and analog models. Analog multimeters, the older type display their output using a needle and dial. Digital multimeters output discreet numeric values on an LED or LCD display.
Using a Multimeter
Before taking a measurement with a multimeter, you must set options with a dial, button, or other means to indicate what you're about to measure. For example, if you were using a meter as is shown aboe, you would press the appropriate buttons to indicate which electrical property you were going to read.
Measuring Resistance
To measure resistance:
- Turn off and disconnect the device you are measuring from its power source. You can damage your meter if you leave the device connected to the power source.
- Additionally, you might need to disconnect the device from its circuit. If it remains connected and multiple paths through the circuit exist you will get misleadingly low readings.
- Set the Multimeter to read resistance. On some meters, you must indicate the resistance range that you expect to be reading.
- Touch the black and red probes together to ether side of the circuit to be measured and read the resistance from the meter's display.
Measuring Voltage
To measure voltage:
- Set your multimeter to read either DC or AC voltage. On some meters, you must also indicate the voltage range that you expect to be reading.
- Touch the black probe to the ground and the red probe to the spot where you want to measure the voltage.
If you are using an analog meter, the needle might attempt to swing backward. This indicates that you have the red probe on the ground. Reverse your contact points to take the reading.
There are many learning options for A+ certification. You can take a self-study training method such as A+ CBT training cd-roms or A+ study guides. If you need a classroom instructor training, you can take a A+ boot camp class. The 5 day training class includes a A+ certification guarantee!
If you have any questions, please call 1-866-718-7246.