What is the purpose of a multimeter and what are analogue and digital multimeters?
Answers
hey mate ,
here is your answer :)
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A multimeter or a multitester, also known as a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter can measure voltage, current, and resistance. Analog multimeters use a microammeter with a moving pointer to display readings.
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(i) Analog Multimeter:
It is basically a multipurpose electronic testing device known as moving coil instrument used for measuring voltages, currents, resistances etc. The display of the multimeter usually relies on a microammeter whose pointer moves over a scale calibrated for all the different measurements. You can easily measure different quantities by changing the switch setting or range on the device itself with the use of various detachable probes.
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Digital Multimeter
The digital multimeter often abbreviated DMM, has an LCD display commonly 3 or 4 digits wide, however there are also bench models with 5 or 6 digits resolution. Some have a multifunction selector switch or push button to select the ranges, but auto-ranging types are also available. Some DMM's have a "hold" and "max" or "min" buttons that can capture the maximum and minimum value of a changing signal. There is no mistaking the reading from a DMM and they do not rely on calibration.
The DMM is capable of measuring AC and DC voltage, AC and DC current, resistance, conductance, and decibels. Often, a DMM has more features than an analogue meter, such as frequency, capacitance, inductance, temperature and transistor current gain.
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