2.4 DC VOLTMETER

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WHAT IS DC VOLTMETER???...

A DC voltmeter...

is measuring tool used to determine the DC voltage.
between any two locations in an electric circuit.
By putting a multiplier Rs in series with the meter movement, the D' Arsonval instrument can be converted to a voltmeter.

Where,

Rse -Rse is the series multiplier resistance

V -V is the full range DC voltage that is to be measured

Im -Im is the full scale deflection current

Rm -Rm is the internal resistance of galvanometer

so the function of Rs???

here it is, to limit the current through the meter as to not exceed the full scale deflection of current

Sensitivity...

-express the value of the multiplier resistence for 1v range.

to calculate...

𝑅𝑆 = (𝑆 × 𝑅𝑎𝑛𝑔𝑒) - 𝑅𝑚

𝑅𝑇𝑜𝑡𝑎𝑙= 𝑆 × 𝑅𝑎𝑛𝑔𝑒

Rs value...

The sensitivity (S) of the meter movement must be determined before the value of the multiplier resistor can be determined.

by using:

S= (1/ I f.s.d)Ω /𝑉

MULTI RANGE

A DC voltmeter can be converted into a multirange voltmeter by connecting a number of resistors (multipliers) in series with the meter movement using multiposition switch
all multiplier resistances except the lowest range 𝑅4 have the standard value and also very precise in tolerances
𝑅4 is the only special resistor which has to be specially manufactured to meet the circuit requirements.

List of formulas in DC Voltmeter...

V = Im (Rs + Rm)

Rs = (V - ImRm) / Im

Rs = (V / Im) - Rm

Sensitivity = Rt / Vrange

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