Wayne Dohnal wrote:
camperpaul wrote:
The best and easiest way is to use a "memo-scope" and a current probe.
I agree but what do you do with the data? Peak, average, RMS, single cycle, over a time window, how long is the window, etc? Even if there's a standard I don't know about, does the generator conform to that standard? I think this is a case where the only practical measurement is to try it and see if it works, or get enough user reports to have a fairly high level of confidence of the expected result. From what I've read, the Yamaha 2400 has a pretty good success rate with 13,500 btuh air conditioners, but there are some exceptions.
The 'scope displays the absolute p-p waveform of the current.
Start with a 10 second widow to find the duration of the inrush.
Turn off the A/C and wait 10 minutes to allow the compressor to bleed down.
Look at it again with a one second window to get the peak value of the inrush.
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The memo-scope sure beats the old way - analog 'scope with a P-7 phosphor CRT.
