Saturday 16 March 2013
INTRODUCTION TO DVMs
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Digital Voltmeters (DVMs)
are a special case of A/Ds.
DVMs are general purpose instruments commonly used to measure
voltages in labs and in the field. DVMs display the measured voltage
using LCDs or LEDs to display the result in a floating point format.They
are instruments of choice for voltage measurements in all kinds of
situations.
They display measurements of
both AC and DC voltages as discrete numerals.
Analog measuring instrument
is current instrument where as digital measuring instrument is a voltage
measuring instrument
Types of DVMs
1)Ramp type
2)Dual slope
3)Successive approximate
type
DVM = A/D converter +
digital read out
Resolution of DVM
It is small incremental change in input which
can be detected. It depends on number of digits
Resolution = 1 / 10N N = number of full digits
Sensitivity
The minimum input voltage
level that can be sensed and displayed by DVM
Sensitivity = resolution *
range
Number os sesitivities of
DVM = number of ranges
Features of DVM
1)They offer superior
resolution of order of 1: 106
2) improved accuracy = +
0.005%
3) parallax errors are
eliminated
4) more portable
5) They offer very high
input resistance in the range of mega ohms.So loading errors are minimized
6) The output is available
in digital form. So further processing is made possible
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