Digital
Multimeter (DMM)
•Digital
multimeter is the combination of Voltmeter (for measuring voltage) Ammeter (for measuring current) and Ohmmeter (for measuring resistance) in one device.
•Basically
digital multimeter
is a multifunction device for measuring AC or DC voltage, current, resistance and continuity etc.
•Digital
multimeter is an example of ADC (analogue to digital converter).
•Digital
multimeter have microprocessor.
•Digital
multimeter have buzzer for continuity measurement.
•For
safety in some digital multimeter there is a HRC fuse inside it.
•There
is a LCD
display for
displaying measured digital values.
•Some components of Digital multimeter
are made from VLSI (Very Large Scale Integration) components.
•Digital
multimeter have DC voltage reference ranging from 1 to 15 V this is the reference for ADC.
•Inside
digital multimeter there is thing like diode bridge, Op-amp, comparator and oscillator etc.
•Digital
multimeters are battery operated.
