Step 2 To begin, make sure no current is running through the circuit or component you want to test. Switch it off, unplug it from the wall, and remove any batteries. Plug the black probe into the COM port on your multimeter . Plug the red probe into the VΩmA port.
How to measure ac voltage Turn the dial to ṽ. Some digital multimeters (DMMs) also include m ṽ . First insert the black lead into the COM jack. Next insert the red lead into the VΩ jack. Connect the test leads to the circuit: black lead first, red second. Read the measurement in the display.
1. Name one thing that should not be done to a multimeter . Acceptable answers include drop it, handle it carelessly, nick or cut the leads, or test voltage with improper voltage range settings.
A measurement of Zero, or very close to zero (less than .5 OHM ) indicates a very low resistance to current flow. Applying voltage to this low level of resistance will result in extremely high current flow.
A multimeter is a handy tool that you use to measure electricity, just like you would use a ruler to measure distance, a stopwatch to measure time, or a scale to measure weight. The neat thing about a multimeter is that unlike a ruler, watch, or scale, it can measure different things — kind of like a multi-tool.
Continuity : Usually denoted by a wave or diode symbol . This simply tests whether or not a circuit is complete by sending a very small amount of current through the circuit and seeing if it makes it out the other end.
Advantages of Digital Multimeters They are more accurate than analog multimeters . They reduce reading and interpolation errors. The ‘auto-polarity’ function can prevent problems from connecting the meter to a test circuit with the wrong polarity. Parallax errors are eliminated.
A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms). It is a standard diagnostic tool for technicians in the electrical/ electronic industries.
Set your multimeter to the lowest setting for resistance (the word “ohms” or an “Ω” symbol can also denote resistance). Touch the red probe to the black probe. Check the display to make sure that it reads “0,” as there should not be any resistance between the two probes. Find a resistor of known value.
In most cases the voltage is measured between a particular point and the ground or zero volt line on a circuit. However this does not mean that the voltage cannot be measured between any two points. Voltages are measured simply by placing the digital multimeter across the two points where the voltage is to be measured .