I was studying avometer, and came across this paragraph which I find

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SUMMARY

The discussion centers on the functionality of an avometer, specifically its voltage measuring component, which operates as a multirange voltmeter. The resistances within the avometer are connected in series with a moving coil galvanometer via a range switch, and their values are determined by the voltage range being measured. The concept of "Ohms per volt" is introduced as a metric for evaluating the performance of analogue meters, highlighting the AVO as a classic, durable, and accurate instrument favored by users.

PREREQUISITES
  • Understanding of multirange voltmeters
  • Knowledge of moving coil galvanometers
  • Familiarity with Ohm's Law (I = V/R)
  • Basic principles of analogue measurement techniques
NEXT STEPS
  • Research the specifications and operational principles of the AVO avometer
  • Learn about the concept of "Ohms per volt" in analogue meters
  • Explore the design and function of range switches in multirange voltmeters
  • Investigate the calibration methods for moving coil galvanometers
USEFUL FOR

Electronics students, technicians, and hobbyists interested in understanding analogue measurement tools and improving their skills in using multirange voltmeters.

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I was studying avometer, and came across this paragraph which I find confusing: "The voltage measuring part of the avometer is actually a multirange voltmeter. It consists of a number of resistances each of which can be connected in series with the moving coil galvanometer with the help of a switch called the range switch. The value of each resistance depends upon the range of the voltmeter which it controls..."
I thought that the resistances make up the range, so why does it say that their values depend upon the range? What range are we talking about here? Please clarify...
 
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Im guessing, but I think they would be referring to the FSD for full scale deflection current of the moving coil galvanometer.

The series resistance will scale it's current based on I = V/R. V is the measured Voltage, and R is the total resistance of the moving coil galvanometer and the range resistance value.

This brings up the term "Ohms per volt" which is a measure of "goodness" of (mainly) analogue meters.
The AVO is a classic instrument rugged and accurage and a pleasure to use.
 

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