Multimeters

Search Edengears.com.pk & Get Multimeters & other Industrial Meters at the Best Price in Pakistan with free Cash on Delivery all over Pakistan. We offer a wide range and a variety of products.

A multimeter is a measuring instrument that can measure multiple electrical properties. A typical multimeter can measure voltage, resistance, and current, in which case it is also known as a volt-ohm-milliammeter (VOM), as the unit is equipped with a voltmeter, ammeter, and ohmmeter functionality. Some feature the measurement of additional properties such as temperature and volume.

Analogue multimeters use a microammeter with a moving pointer to display readings. Digital multimeters (DMM, DVOM) have numeric displays and have made analogue multimeters obsolete as they are cheaper, more precise, and more physically robust than analogue multimeters.

Any meter will load the circuit under test to some extent. For example, a multimeter using a moving coil movement with a full-scale deflection current of 50 microamps (μA), the highest sensitivity commonly available, must draw at least 50 μA from the circuit under test for the meter to reach the top end of its scale. This may load a high-impedance circuit so much as to affect the circuit, thereby giving a low reading. The full-scale deflection current may also be expressed in terms of “ohms per volt” (Ω/V). The ohms per volt figure is often called the “sensitivity” of the instrument. Thus a meter with a 50 μA movement will have a “sensitivity” of 20,000 Ω/V. “Per volt” refers to the fact that the impedance the meter presents to the circuit under test will be 20,000 Ω multiplied by the full-scale voltage to which the meter is set. For example, if the meter is set to a range of 300 V full scale, the meter’s impedance will be 6 MΩ. 20,000 Ω/V is the best (highest) sensitivity available for typical analog multimeters that lack internal amplifiers. For meters that do have internal amplifiers (VTVMs, FETVMs, etc.), the input impedance is fixed by the amplifier circuit.