m of PMMC based voltmeter Calculator

✖Multiplier Resistance is the value of series resistance attached to the pmmc-based voltmeter.ⓘ Multiplier Resistance [R_s]			+10% -10%
✖Internal Resistance of Meter Movement refers to the opposition offered by the device's coil to the flow of electric current, affecting its sensitivity and accuracy in measuring electrical quantities.ⓘ Internal Resistance of Meter Movement [R_m]			+10% -10%

✖Multiplying Power refers to the mechanism by which shunt resistors are used to divert most of the current, allowing the meter to measure higher currents accurately.ⓘ m of PMMC based voltmeter [m]

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Formula

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m of PMMC based voltmeter

Formula

`"m" = 1+("R"_{"s"}/"R"_{"m"})`

Example

`"3.181818"=1+("12Ω"/"5.5Ω")`

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m of PMMC based voltmeter Solution

STEP 0: Pre-Calculation Summary

Formula Used

Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement)
m = 1+(R_s/R_m)
This formula uses 3 Variables

Variables Used

Multiplying Power - Multiplying Power refers to the mechanism by which shunt resistors are used to divert most of the current, allowing the meter to measure higher currents accurately.
Multiplier Resistance - (Measured in Ohm) - Multiplier Resistance is the value of series resistance attached to the pmmc-based voltmeter.
Internal Resistance of Meter Movement - (Measured in Ohm) - Internal Resistance of Meter Movement refers to the opposition offered by the device's coil to the flow of electric current, affecting its sensitivity and accuracy in measuring electrical quantities.

STEP 1: Convert Input(s) to Base Unit

Multiplier Resistance: 12 Ohm --> 12 Ohm No Conversion Required
Internal Resistance of Meter Movement: 5.5 Ohm --> 5.5 Ohm No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

m = 1+(R_s/R_m) --> 1+(12/5.5)

Evaluating ... ...

m = 3.18181818181818

STEP 3: Convert Result to Output's Unit

3.18181818181818 --> No Conversion Required

FINAL ANSWER

3.18181818181818 ≈ 3.181818 <-- Multiplying Power

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics and Instrumentation » Measuring Instrument Circuits » Permanent Magnet Moving Coil » m of PMMC based voltmeter

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Vellore Institute of Technology (VIT), Vellore

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< 9 Permanent Magnet Moving Coil Calculators

Angle of deflection of PMMC

Go Angle of Deflection in Magnetic Coil = (Number of Turns of Magnetic Coil*Flux Density of Coil*Length*Width*Current in Coil)/Spring Constant

Deflecting torque of PMMC instrument

Go Deflecting Torque = Number of Turns of Magnetic Coil*Flux Density of Coil*Length*Width*Current in Coil

Rsh of PMMC based Ammeter

Go Resistance of Shunt = (Full Scale Deflection Current*Internal Resistance of Meter Movement)/(Current-Full Scale Deflection Current)

Resistance at switch position 'n' for multi range Ammeter

Go Resistance at nth Switch Position = (Resistance at Switch Position 1+Internal Resistance of Meter Movement)/Nth Multiplying Factor

Nth resistance in multi-range voltmeter

Go Nth Multiplier Resistance = (Nth Multiplying Factor-(n-1)th Multiplying Factor)*Internal Resistance of Meter Movement

Rs of PMMC based voltmeter

Go Multiplier Resistance = (Voltage/Full Scale Deflection Current)-Internal Resistance of Meter Movement

Nth resistance in multi-range Ammeter

Go Nth Multiplier Resistance = Internal Resistance of Meter Movement/(Nth Multiplying Factor-1)

m of PMMC based voltmeter

Go Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement)

m of PMMC based Ammeter

Go Multiplying Power = (1+Internal Resistance of Meter Movement)/Resistance of Shunt

m of PMMC based voltmeter Formula

Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement)
m = 1+(R_s/R_m)

What is PMMC?

PMMC stands for Permanent Magnet Moving Coil. The instruments which use the permanent magnet for creating the stationary magnetic field between which the coil moves are known as a permanent magnet moving coil or PMMC instruments.

What are Voltmeter multipliers?

Voltmeter multipliers are PMMC based voltmeters that have a resistance connected in series. It limits the current through the meter and does not allow the value to exceed set value for a full scale deflection. This protects meter from damage.

How to Calculate m of PMMC based voltmeter?

m of PMMC based voltmeter calculator uses Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement) to calculate the Multiplying Power, The m of PMMC based voltmeter isthe multiplying power of pmmc for voltmeter multipliers which is used for voltage measurement. Multiplying Power is denoted by m symbol.

How to calculate m of PMMC based voltmeter using this online calculator? To use this online calculator for m of PMMC based voltmeter, enter Multiplier Resistance (R_s) & Internal Resistance of Meter Movement (R_m) and hit the calculate button. Here is how the m of PMMC based voltmeter calculation can be explained with given input values -> 3.181818 = 1+(12/5.5).

FAQ

What is m of PMMC based voltmeter?

The m of PMMC based voltmeter isthe multiplying power of pmmc for voltmeter multipliers which is used for voltage measurement and is represented as m = 1+(R_s/R_m) or Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement). Multiplier Resistance is the value of series resistance attached to the pmmc-based voltmeter & Internal Resistance of Meter Movement refers to the opposition offered by the device's coil to the flow of electric current, affecting its sensitivity and accuracy in measuring electrical quantities.

How to calculate m of PMMC based voltmeter?

The m of PMMC based voltmeter isthe multiplying power of pmmc for voltmeter multipliers which is used for voltage measurement is calculated using Multiplying Power = 1+(Multiplier Resistance/Internal Resistance of Meter Movement). To calculate m of PMMC based voltmeter, you need Multiplier Resistance (R_s) & Internal Resistance of Meter Movement (R_m). With our tool, you need to enter the respective value for Multiplier Resistance & Internal Resistance of Meter Movement and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Multiplying Power?

In this formula, Multiplying Power uses Multiplier Resistance & Internal Resistance of Meter Movement. We can use 1 other way(s) to calculate the same, which is/are as follows -

Multiplying Power = (1+Internal Resistance of Meter Movement)/Resistance of Shunt

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