(If you take 5% of the Coaxial Dynamics power slug wattage rating, plus 10% of the Daiwa's power range, the readings were always +/- the sum of these two numbers.) It appears quite possible that both meters were within their rated accuracy ranges. (i.e.5W difference at 10W between the two meters) At certain power levels, particularly those towards the middle-to-upper end of the "full scale" power setting, the readings were pretty close. The Daiwa consistently read higher than the Coaxial Dynamics at the low end of the Daiwa's 20W power setting. However, given that the rated accuracy is based off the full scale power setting, this is to be expected when taking readings at 15 - 25% of the rated full scale power output. Accuracy was "the worst" at very low power levels, showing as much as 85% differences between the two meters. The meters were not linear in their readings so calibration of one meter to the other, across different bands and at various power levels, would not be possible. CD 3.63W REFLECTED, Daiwa 3.41W REFLECTED For the test I connected the Daiwa to the output of the Coaxial Dynamics meter with a PL259-PL259 adaptor. I had VHF slugs for 10W and 100W for the Coaxial Dynamics, as well as UHF slugs for 10W and 50W. The Daiwa has 20W and 200W power settings. The Coaxial Dynamics meter is rated at +/- 5% accuracy of Full Scale, the Daiwa is rated at +/- 10% accuracy of Full Scale. I compared a Coaxial Dynamics wattmeter to my Daiwa CN-103M wattmeter.
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