how to read a multimeter?

Answer 1

a multimeter is a one-set instrument that can be used as voltmeter, ampmeter, ohmmeter, cable continuity tester.
it has a screen and a switch and two cables for test.
usually you can read the result directly from the screen or you have to multiply the number by the scale if it's not automatically multiplied.
to connect it to the circuit you turn the switch to the instrument you want [amp, volt, ] chosing first the maximum scale [ex: KV], connect the test lines as the instrument [for amp: in serie, for volt: in parallel] then go down with switch to the right scale.
NB: Never put an ampmeter in parallel to a circuit.

Answer 2

Assume a basic multimeter - i.e., an instrument for measuring amps, volts, ohms.... Set input switches to the appropriate quantity and range (e.g., 100mV), connect across (in this case) the circuit component under test and read the scale.
Some multimeters will have needles (e.g.,the traditional AVO meter), but these days most have digital readouts. With the former, you must ensure you get the polarity of connection correct (otherwise the needle might try to move backwards and possibly bend), but with the digital type it is not so important since the meter readout will indicate + or -. More complex multimeters enable you to read capacity, temperature, even sound levels, but you will usually need an accessory - e.g., a temperature probe.

Answer 3

The labels on a multimeter can seem like their own language to a layman, and even people with electrical experience may need a helping hand if they encounter an unfamiliar multimeter with an offbeat abbreviation system. Fortunately, it won't take long to translate the settings and understand how to read the scale, so you can get back to your work.

1.)Test AC or DC voltage. In general, V indicates voltage, a squiggly line indicates alternating current (found in household circuits), and a straight or dashed line indicates direct current (found in most batteries). The line can appear next to or over the letter.
a.) The setting for testing voltage in an AC circuit is typically marked V~, ACV, or VAC.
b.) To test voltage on a DC circuit, set the multimeter to V–, V---, DCV, or VDC.

2.)Set the multimeter to measure current. Because current is measured in amperes, it is abbreviated A. Choose direct current or alternating current, whichever the circuit you are testing is made for. Analog multimeters typically do not have the ability to test current.

3.) Estimate the value between numbers. Voltage scales on an analog multimeter work just like an ordinary ruler. The resistance scale, however, is logarithmic, meaning that the same distance represents a different change in value depending on where you are on the scale. The lines between two numbers still represent even divisions. For example, if there are three lines between "50" and 70," these represent 55, 60, and 65, even if the gaps between them look different sizes.

4.)Multiply the resistance reading on an analog multimeter. Look at the range setting that the dial of your multimeter is set to. This should give you a number to multiply the reading by. For example, if the multimeter is set to R x 100 and the needle points to 50 ohms, the actual resistance of the circuit is 100 x 50 = 5,000.

5.) Find out more about the dB scale. The "dB" scale, typically the lowest, smallest one on an analog meter, requires some additional training to use. It is a logarithmic scale measuring the voltage ratio. The standard dBv scale in the US defines 0dbv as 0.775 volts measured over 600 ohms of resistance, but there are competing dBu, dBm, and even dBV scales.


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Answer 4

More simple than you think. 12.68 DCV is 12 volts and 680 millivolts. 0.035 A is 35 milliamps. 0.200 is 200 milliamps.