How do you read a voltmeter scale?
Answers
Answer:
An analog ohmmeter scale is “backwards” from that of a voltmeter or ammeter, the movement needle reading zero resistance at full-scale and infinite resistance at rest.
Answer:
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.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.[1]
The power coming from most household circuits is AC. However, some devices may convert the power to DC through a transistor, so check the voltage label before you test an object.[2]
The setting for testing voltage in an AC circuit is typically marked V~, ACV, or VAC.
To test voltage on a DC circuit, set the multimeter to V–, V---, DCV, or VDC.
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.
A~, ACA, and AAC are for alternating current.
A–, A---, DCA, and ADC are for direct current.
Find the resistance setting. This is marked by the Greek letter omega: Ω. This is the symbol used to denote ohms, the unit used to measure resistance. On older multimeters, this is sometimes labeled R for resistance instead. DC+ and DC-. If your multimeter has this setting, keep it on DC+ when testing a direct current. If you aren't getting a reading and suspect you've got the positive and negative terminals attached to the wrong ends, switch to DC- to correct this without having to adjust the wires.[3]Understand other symbols. If you're not sure why there are multiple settings for voltage, current, or resistance, read the troubleshooting section for information on ranges. Besides these basic settings, most multimeters have a couple additional settings. If more than one of these marks is next to the same setting, it may do both simultaneously, or you may need to refer to the manual.
))) or a similar series of parallel arcs indicates the "continuity test." At this setting, the multimeter will beep if the two probes are electrically connected.[4]
A right-pointing arrow with a cross through it marks the "diode test," for testing whether one-way electrical circuits are connected.[5]
Hz stands for Hertz, the unit for measuring the frequency of AC circuits.[6]
–|(– symbol indicates the capacitance setting.
Read the port labels. Most multimeters have three ports or holes. Sometimes, the ports will be labeled with symbols that match the symbols described above. If these symbols are unclear, refer to this guide:
The black probe always goes into the port labeled COM for common (also called the ground. (The other end of the black lead always connects to the negative terminal.)
When measuring voltage or resistance, the red probe goes into the port with the smallest current label (often mA for milliamps).[7]
When measuring current, the red probe goes into the port labeled to withstand the amount of expected current. Typically, the port for low-current circuits has a fuse rated to 200mA while the high-current port is rated to 10A.[8]
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