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Say for example you have a voltmeter advertised as being plus or minus 10%. That has to mean "of full scale" in order to mean anything. Now, say this meter has a full-scale value of 100 volts. Ten per cent of a hundred...carry the 6... OK. With a known-good 100 volts applied, the meter can read anywhere from 90 to an extrapolated 110 volts and still meet the manufacturer's specifications. Similarly, if you're trying to read a known-good ten volts, the meter can read anywhere from zero to twenty volts and meet the specs. Bird meters must be used with a calibrated slug of realistic power and frequency range.

[QUOTE="Beetle, post: 683931, member: 1066"] Say for example you have a voltmeter advertised as being plus or minus 10%. That has to mean "of full scale" in order to mean anything. Now, say this meter has a full-scale value of 100 volts. Ten per cent of a hundred...carry the 6... OK. With a known-good 100 volts applied, the meter can read anywhere from 90 to an extrapolated 110 volts and still meet the manufacturer's specifications. Similarly, if you're trying to read a known-good ten volts, the meter can read anywhere from zero to twenty volts and meet the specs. Bird meters must be used with a calibrated slug of realistic power and frequency range. [/QUOTE]

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