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My interpretation of the 25 micro second figure is that it samples the waveform (current or voltage) at a rate of 40kHz. I've just had a quick check. The 'peak' function has 'max hold' built in, so it displays the maximum sample measurement (not the RMS figure) since the function was selected.
Measuring the supply to my 5W LED table lamp (not during start up), the RMS current is 55mA (power factor is not 1). The 'peak' value is 300mA, so it'll be a pretty odd waveform.
Cheers mate. Must admit some of the terminology is a little over my head! Don't fully understand RMS yet! Must read up on it.
I will defo contact Metrel. If it is the sample rate, rather than the overall duration then that is excellent. Thinking about it I would assume it is, as 25 micro seconds is not very long! The Fluke has a specific inrush button which sets the tester to measure the first five cycles ie 100 milli seconds only I believe. Whereas to measure the peak with 'max hold' (as in the Metrel) would likely keep measuring for a longer period. I would imagine inrushes can peak way after 25 micro seconds has passed!
How long have you had yours... Has it been OK... Would you buy it again??
A mate had a Metrel MFT a few years back and it seemed pretty decent to me.
Thanks again, Neil