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Analog meters' accuracy is specified as "percentage of full scale deflection", meaning that on a 100 watt input, on a 0-100 watt meter scale specified by the meter manufacturer to have an uncertainty no more than plus or minus 1% FSD, the maximum uncertainty would be plus or minus one watt ANYWHERE on that scale. The user should know to use the scale that produces the highest upscale deflection without going off the scale.

On a 200 watt range with the same uncertainty, the 100 watt input might read anywhere from 98W to 102W, which meet the manufacturer's specifications.

Digital circuitry is subject to components changing value from age, temperature, humidity -- kinda like people.

[QUOTE="Beetle, post: 575548, member: 1066"] Analog meters' accuracy is specified as "percentage of full scale deflection", meaning that on a 100 watt input, on a 0-100 watt meter scale specified by the meter manufacturer to have an uncertainty no more than plus or minus 1% FSD, the maximum uncertainty would be plus or minus one watt ANYWHERE on that scale. The user should know to use the scale that produces the highest upscale deflection without going off the scale. On a 200 watt range with the same uncertainty, the 100 watt input might read anywhere from 98W to 102W, which meet the manufacturer's specifications. Digital circuitry is subject to components changing value from age, temperature, humidity -- kinda like people. [/QUOTE]

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