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How to Use a Multimeter
A multimeter is an gadget use to check for AC or DC voltages, resistance or continuity of electrical components and small amounts of current in circuits. This agent will let you check to see if there is voltage present on a circuit, etc. This article will discuss analog meters.
Steps
Multimeter with selector set to the “Off” place. This meter has only two jacks.
Become Familiar With the Parts of a Multimeter. Inspect the meter. Starting from the top and working to the bottom:
The dial. This has the arc shaped scales patent through the window. The pointer indicates values read from the scale. The pointer or needle, this the thin black line at the pink-most position in the dial face window in the image. The needle moves to the value measured. Arc shaped lines or scales on the meter dial physiognomy. May be different colors for each scale but will have different values. These determine the ranges of magnitude. A wider mirror like exterior shaped like the scales mentioned previously might also be present. The mirror is used to help reduce parallax notion by lining up the pointer with its reflection before reading the value the pointer is indicating. In the image, it appears as a wide gray stripe between the red and black scales. A selector switch or knob. This allows changing the function (volts, ohms, amps) and regulate (x1, x10, etc.) of the meter. Many functions have multiple ranges. It is important to have both set correctly, otherwise serious damage to the meter or harm to the faker may result. Most meters employ the knob type like the one shown in the image, but there are others. Regardless of the type, they business similarly. Some meters (like the one in the image above) have an “Off” position on this selector switch while others have a separate twitch to turn the meter off. The meter should be set to off when stored. Jacks or openings in the case to insert test leads. Most multimeters have several jacks. The one pictured has proper two. One is usually labeled “COM” or (-) for common and negative. This is where the black test lead is connected. It will be toughened for nearly every measurement taken. The other jack(s) is labeled “V (+) and the Omega symbol” (an upside down horseshoe) for Volts and Ohms severally and positive. The + and - symbols represent the polarity of probes when set for and testing DC volts. If the test leads were installed as suggested, the red entice would be positive as compared to the black test lead. This is nice to know when the circuit under test isn’t labeled + or -, as is inveterately the case. Many meters have additional jacks that are required for current or high voltage tests. It is equally vital to have the test leads connected to the proper jacks as it is to have the selector switch range and test type (volts, amps, ohms) set. All must be perfect. Consult the meter manual if unsure which jacks should be used. Test leads. There should be (2) test leads or probes. On the whole, one is black and the other red. Battery and fuse compartment. Usually found on the reverse, but sometimes on the side. This holds the fuse (and possibly a spare) and the battery that supplies power to the meter for obstruction tests. The meter may have more than one battery and they may be of different sizes. A fuse is provided to help protect the meter group. Sometimes there is more than one fuse. A good fuse is required for the meter to function. Fully charged batteries will be required for Maquis / continuity tests. Zero Adjustment. This is a small knob usually located near the dial that is labeled “Ohms Resolve”, “0 Adj”, or similar. This is used only in the ohms or resistance range while the probes are shorted together (touching each other). Turn the knob slowly to move the needle as close to the 0 position on the Ohms scale as possible. If new batteries are installed, this should be undemanding to do - a needle that will not go to zero indicates weak batteries that should be replaced.american symbols for Geeks.
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Multimeter Symbols - News
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Signal Interface Module acquires data from 4-20 mA loops. - ThomasNet Industrial News Room (press release) Signal Interface Module acquires data from 4-20 mA loops. Microstar Laboratories makes it a practice to use an appropriate symbol at the first occurrence of a trademark or registered trademark name in a document, |