Bird Trulines were designed a long time ago. Yes they are good but not that
good. Certainly not a calibration standard. With a pure signal they give
good results within their specification.
With this type of meter it is very important to make sure there are no
harmonics in the signal as the eleme
Working in the electronic calibration field for some years I have found that
any mechanical meter movement has it's greatest accuracy at full scale only.
the meter movement's accuracy diminishes as you go down in scale. So if a Bird
Wattmeter is calibrated for 5% accuracy at full scale then it's
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