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cmichael

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  1. 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
  2. I'm having an issue with the AMM-1 (firmware v3.8 ) regarding power measurements. Using Live/Realtime Pwr (or Dyno, etc) when measured power exceeds around 130W, it suddenly reports zero. For example, if I give it a 1KHz sinwave at ~25VRMS, ~5A into 5 Ohms. However, the User's Manual says it can measure up to 15KW. My waveform does start to clip at 75W on the DSO and at 130W it's fairly clipped (clipping is OK in my situation). However, the AMM-1 doesn't report clipping. I'm confident my amp can put out >130W but how can I get the AMM-1 to measure it?
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