Instrument Accuracy: Does Error Remain % or Change to +-V?

In summary, when a galvanometer's accuracy is given as a percentage of its full scale deflection, its accuracy would remain at 1% throughout its range. This means that at a reading of 50V, the error would still be +-1V, resulting in an overall error of 2%. This applies to all readings below full scale deflection. Additionally, this accuracy is valid throughout the instrument's range as long as the tolerances are given by the manufacturer.
  • #1
ineedmunchies
45
0
If an electromechanical instrument's (say a galvanometer) accuracy is given as a percentage of its full scale deflection, what would its accuracy be at anything lower than full scale deflection?

My thoughts:
If say full scale deflection is 100V
The error is +-1% which is +-1V,
Does that mean at a reading of 50V it would still be +-1V which would be be +-2%?

Or does it remain as a percentage error, and the error would be +-0.5 V at +-1% still?
 
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  • #2
Galvanometers are linear so expect 1% error throughout its range.
 
  • #3
Sorry i meant to type voltmeter in there.
 
  • #4
If the tolerances are given by the manufactures, that should be valid throughout its range.
 

1. What is instrument accuracy?

Instrument accuracy refers to the degree to which a measurement made by an instrument matches the true value of the quantity being measured. It is a measure of the instrument's ability to provide precise and reliable measurements.

2. How is instrument accuracy measured?

Instrument accuracy is typically expressed as a percentage of the true value or as a range of values. This is determined by comparing the instrument's measurements to a known standard or reference value. The smaller the percentage or range, the more accurate the instrument.

3. Does the accuracy of an instrument change over time?

Yes, the accuracy of an instrument can change over time due to factors such as wear and tear, environmental conditions, and calibration drift. It is important to regularly calibrate and maintain instruments to ensure their accuracy remains consistent.

4. What is the difference between error remaining as a percentage or changing to +-V?

When instrument accuracy is expressed as a percentage, it means that the error of the measurement will remain within a certain percentage of the true value. On the other hand, when it is expressed as +-V, it means that the error can be both positive and negative, with a maximum deviation of V from the true value.

5. How can instrument accuracy affect scientific research?

The accuracy of an instrument is crucial in scientific research as it directly impacts the reliability and validity of the data collected. Inaccurate instruments can lead to incorrect conclusions and affect the overall quality of the research. Therefore, it is important to carefully consider and maintain instrument accuracy in scientific experiments.

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