The meter is a device bringing together in one case several tools for electrical measurements. These devices are capable of measuring voltages, currents, and resistances. To these essential functions, some more advanced options can be added, such as the continuity tester, the capacitance, the transistor tester, and even temperature.
- Difficulty: medium.
- Tools and materials needed: multimeter.
Presentation of the unit
A multimeter is comprised of a set of terminals where the measuring electrodes one branch, a screen where one reads the measure, and a control wheel.
The number of terminals may vary, but the device has a characteristic black terminal marked com and other specialized terminals by families measurement. Can be found for example a pair of terminals to measure the intensities, selecting according to the power to be measured, and another terminal for voltage, resistance and continuity tests.
For a type of measurement given, the device can have multiple templates or an automatic adjustment system. If your device is manual, it will include more thresholds for each type of variable to be measured. In continuous mode voltmeter, for example, it will present the following ratings: 1000V, 200V, 20V, 2V 200mV. To take your test, always leaving the larger gauge and caliber by caliber down to saturate the camera, the display will show “I.” Once that is found. You will know that the caliber imméditement above is more accurate to make your measurement.
What functions for what purpose?
Whether you are a handyman or electrician, you will not have the same needs regarding measurement modes, display, and accuracy of your meter.
Let us set an overview of the most useful ways to suit your needs according to multimeter reviews.
Occasional use and small crafts from simple bulb change, the connection of an electrical outlet, or the battery test / battery, detection of simple breakdowns for example. In all these cases, a basic multimeter is ample. The voltmeter and ohmmeter functions allow you to carry out your work while ensuring the presence or absence of voltage. Choose a camera with a wide voltage measurement range (200mV to 200V DC and 0 to 600V AC); it will fit all situations. The ohm meter function will cover the resistances ranging from 0 (continuity) 2 M Ω. Make your choice to a device offering a selection of limited sizes (analog or digital) will limit errors, and simplify its use.
Frequent use: you regularly work on electrical systems or equipment, wire tables or equipment, or even detect and locate simple breakdowns. In all these scenarios, you will need a little more performance multimeter, reliable, and with additional modes. Besides the typical ohmmeters and voltmeters, orient yourself an apparatus for measuring currents also expressed in An (amps). For simplicity, a multimeter like “fork” or “clip” ammeter is a good choice because it will allow you to measure your décâbler without anything on the installation. The basic templates (10A continuous / 200A AC) will cover all your needs. A digital multimeter will facilitate your reading and measures.
Intensive / commercial use: you are an electrician or have a high electrical training, you perform AZ facilities, you are asked to work on industrial voltages (greater than 230 V and three phase), and troubleshooting regularly electric machines and apparatus. You need a good quality multimeter, equipped with suitable operating modes with a measurement range consistent with your work. In the voltmeter function, choose a model allowing measurements up to 200 V continuous and 1000V AC. For the ammeter function of pliers, orient yourself to a range covering all currents up to 10 A continuous and 400A AC. Regarding your fault research fashions “Capacity” expressed in F (farad) for capacitors, “Impedance” expressed in Ω for the windings, and “Power Meter” in W (watts) to calculate powers are helpful. Your choice will be imperative to a digital model.
Measuring an intensity
To measure power, the serial device branch. This type of action is reserved for small voltage is preferred for practical and safety reasons, the current probe to the multimer to make measurements on high intensities.
Descend gradually in templates to make your measurement.
Measuring a voltage
To measure voltage, mount the device in parallel to the measuring points. This type of analysis can be used for example to control the presence of tension between two industry son (phase and neutral) before surgery. We may also need to measure the voltage across a battery or a battery to verify the origin of a problem. In this case, measuring a voltage “empty” is not entirely representative of the state of the battery or the battery concerned.
To measure resistance, isolate the device or the thread of his circuit, then mount the unit in parallel to the points where you want to measure. There are few cases where it is necessary to make a measurement resistor in the current DIY. However, such measures can be carried out on a long length of wire to indirectly determine the voltage drop will be caused by the cable resistance.
Test continuity of a circuit
The mode continuity tester is a variation in all-or-nothing measure mode resistors with a buzzer to indicate a closed circuit. The continuity tester mounting method is similar to that in ohmmeter mode. If your meter does not have the continuity tester function, you can instead use the ohm meter, or on a minuscule caliber, and verify that the resistance is almost zero. If the opposite, resistance is infinite ( “I” symbol), you will have an open circuit. This type of measurement can quickly diagnose the state of a fuse, an incandescent bulb opaque or wire.
This is Zoniv from http://www.zoniv.com – the site that provides useful information about best multimeters in the market. Enjoy reading!