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Only a few decades ago, if you knew how to use a multimeter, you were probably an electronics technician or an engineer. But, today, the handy test equipment known as a Digital Multimeter should be in the toolbox of every handyperson. The multimeter is great for determining the working status of many appliances. Multimeters are available in either digital or analog models. Digital multimeters will display readings in numbers. Analog multimeters indicate the value with a needle over a scale.
Have you ever wondered why a light doesn’t turn-on. If the lightbulb is not bad, the lamp may be out of order? Is the lamp cord bad? Here is one simple example where a digital multimeter comes in very handy. A useful function of a multimeter is the resistance, or “continuity” test function. To avoid the chance of electrical shock, it is important to never use the continuity test function on any appliance that has live voltage connected. Always make sure the appliance is first NOT connected to any power source.
Now with the power disconnected, set the multimeter dial to Resistance (Ohms). Touch the two test probes together (one is Red “positive”, the other is Black “negative”). The OHM meter reading will indicate zero resistance. When there is zero resistance, you have continuity. A reading of zero indicates the circuit is closed and the circuit can conduct current. Now for an easy first test, take a standard lightbulb out of a lamp socket. Touch one test probe to the bottom of the lightbulb, and touch the other test probe to the threaded side of the lightbulb socket. If you read continuity, or zero resistance, the lightbulb is good. If the meter does not indicate continuity, then you know the lightbulb interior filament is broken (current can not pass thru). The same test can be performed on two ends of a simple electrical cord. If the meter does not indicate continuity, then there is a break in the circuit, and the cord is probably cut. Remember to never test the continuity of any cord or appliance with the power on. Always first disconnect any power or current source.
To test a switch, place a test probe on each side (pole) of the switch. When you move the switch from the off to on position, the multimeter reading should change from zero to infinity. If not, then the switch is not working properly. To test a motor, touch a test probe to each pole. Again, a reading of zero indicates that the motor has continuity, current can pass through, and the motor windings are good.
After carefully studying the instructions of the digital multimeter, you will be able to move on to more detailed electrical tests. A multimeter can measure alternating current (AC or household current) or direct current (DC or battery current) in a live circuit. It can also check voltage. A multimeter can test 120 volts AC in a home circuit, or it can test DC batteries to learn if they are weak or fully charged.
Take the time now to learn how to properly use a basic multimeter. You will be glad you did when someday you would like to verify the cause of an everyday electrical problem.
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Watt's Up RC Watt Meter & Power Analyzer WU100 Version 2 --- SALE! $54.00 # Specifications: # Voltage 0-60 V, resolution 0.01 V. That's a 14 cell series li-poly pack! # Current 0-100 A peak, 50 A continuous, resolution 0.01 A # Charge 0-65 Ah, resolution 0.001 Ah. That's ~32 Amps for two hours! # Power 0-6500 W, resolution 0.1 W. That's ~8.7 Horsepower! # Energy 0-6500 Wh, resolution 0.1 Wh. # Operates from 4.0-60 V, 0 V with optional receiver battery pack # 16 x 2 STN... |
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Fluke C1600 Gear Box for Meter and Accessories $45.40 METER GEAR BOX... |
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Fieldpiece LT17A Classic Style Digital Multimeter w/Temp, MFD, Microamps, Frequency $122.02 The LT17A is the classic style meter. This manual ranger covers most of the parameters and ranges you need for most HVAC/R applications. The LT17A meter measures current, resistance, voltage, capacitance, frequency, continuity, and temperature. Test leads store in the meter body and, with the probe tips removed, connect the LT17A to Fieldpiece accessory heads. The body is made out of durable ABS p... |
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Fieldpiece SC53 Dual Display Mini Clamp Meter with Temperature $93.44 Read amps and volts at the same time with the Dual-Display Mini Clamp Meter with Temperature, model SC53. In addition to having a dedicated display for reading amps, you can measure any of the other ranges on the meter dial simultaneously. The SC53 is compact measuring only about 8-inches, easy to use and includes many of the ranges you use everyday during HVAC/R field service. Many instructors re... |
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DIGITAL MULTIMETER MODEL 50200A - Power Tested Only - Great Condition Product Details Large 3 1/2 Digit, 7-Segment LED Display. Broadband RMS accurate measurement of AC signals. Auto polarity, decimal, zero, and over-range indication. High-input impedance on all ranges never loads the circuit. Voltage, current, and resistance have separate inputs that can be simultaneously connected. Easy function selection with pushbutton switch for current, voltage, or Ohms measur... |
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