Designing a Multirange Ohm Meter with a D'Arsonval Movement

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To design a multirange ohm meter using a D'Arsonval movement, a DC power supply is required in series with the meter and the resistance being measured. The resistor configuration is crucial; a series resistor (multiplier) is used for voltage measurement, while a parallel resistor (shunt) is utilized for current measurement. The design involves selecting resistor values to establish different measurement ranges and incorporating a switch to change between these ranges. Digital ohmeters, in contrast, measure voltage across probes directly and convert it to an ohm value. Understanding these principles is essential for creating an effective multirange ohm meter.
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Can someone help me to design the multirange ohm meter using permenant magnetic moving coil movement...
 
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Can you give more info on the "permenant magnetic moving coil movement"?
 
We had to do this in school. Is this homework?
 
ahmadkza86 said:
Can someone help me to design the multirange ohm meter using permenant magnetic moving coil movement...

One version is called a D'Arsonval movement.

The resistor in series (current mode) or parallel (voltage) determines the range. Figure the value of resistor to give you a range, then a switch to change ranges. Pretty basic stuff.
 
Integral said:
One version is called a D'Arsonval movement.

The resistor in series (current mode) or parallel (voltage) determines the range. Figure the value of resistor to give you a range, then a switch to change ranges. Pretty basic stuff.


He wants an ohmeter. What you've described (incorrectly) is used for measuring voltage and current as you stated. The resistor in parallel with the meter is used to measure current and is referred to as a shunt resistor. The series resistor is referred to as a multiplier resistor and this arrangement is used for measuring voltage.
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Typically an ohmeter that uses the d'arsonval meter movement has a DC power supply in series with the meter movement also in series with resistance to be measured. The power supply voltage and series resistor are varied to get the range wanted. Digital ohmeters will use a current source hooked directly to the probes and the voltage across the probes is measured and converted to an ohms value.
 

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