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Power measurement issue with AMM-1

cmichael
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cmichael Newbie

cmichael

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Hi Steve,

I'm having a second issue with the AMM-1 (firmware v3.8 ) regarding power measurements. Using Live/Realtime Pwr, when the frequency of my test tone exceeds 1KHz, the PF abruptly cuts in half, roughly. For example, at 1.00KHz (and below) PF=89 and at 1.1KHz (and above) PF= 50. This causes the measured power to drop by 50%, also. On the DSO I can see no change in the waveform whatsoever when changing from 1KHz to 1.1KHz (besides a tiny increase in frequency). This problem is completely independent of input power, clipping, etc. This is a serious issue for me because it's preventing me from using the AMM-1 to make meaningful measurements for the project I'm working on. Any info appreciated, thanks.

- cmichael

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