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

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The accuracy of an electromechanical instrument like a voltmeter is typically expressed as a percentage of its full-scale deflection. When operating at lower voltages, the absolute error can change, leading to a different percentage error. For instance, if a voltmeter has a full-scale deflection of 100V with a ±1% accuracy, the error at 50V would indeed be ±1V, translating to ±2% error. However, if the instrument maintains linearity, the error remains ±0.5V at lower readings, preserving the ±1% accuracy. Manufacturer specifications should apply consistently across the instrument's range.
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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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Galvanometers are linear so expect 1% error throughout its range.
 
Sorry i meant to type voltmeter in there.
 
If the tolerances are given by the manufactures, that should be valid throughout its range.
 

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