How much difference is between meters that have an inrush setting vs a meter that doesn’t but are able to set up on max to be able to catch that amperage? For example my 902 fc doesn’t have the inrush feature so I just set it to max and catch that amperage when a compressor starts. Is inrush more precise or quicker?
Inrush vs max amps
Hurst11
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How much difference is between meters that have an inrush setting vs a meter that doesn’t but are able to set up on max to be able to catch that amperage? For example my 902 fc doesn’t have the inrush feature so I just set it to max and catch that amperage when a compressor starts. Is inrush more precise or quicker?
I get that but on clamp meters with the min/max feature and using it on amperage, how does that compare to say the testo 770-3 that has the inrush feature? Is the testo seeing it and a meter without completely missing it?
Yea I think your confusing what I’m curious about but no worries
Maybe this will be clearer. With my 902 if I’m trying trying to check maximum starting amps on a compressor I put it on amps and push the min/max button and it captures/holds the maximum amp that it sees. Is that the same as the inrush feature on other amp clamp meters? If not what are the differences?
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Hell guys, I am trying to catch up with new technologies. My Digisnap 1000 ask it to read current, and it had a" peak hold" function button. Volts or amps. If you really want that kind of data, before you consider a meter, do a little research on the one you are considering. I don't know if they still make the Digisnap, but it made diagnostics simple.
I’m not trying to pick a meter bud just trying to get some clarification on particular functions between a couple of different ones.
I have mainly used Fluke 300 series clamp meter when checking up to 5ton Scrolls and Recips, The inrush capable meters are much faster than the ones that dont have the inrush feature. The min/MAX feature on those meters are not fast enough to capture that 100-300msec rush of AC current and will typically not see that spike, it will show maybe just a few amps over steady state draw, but i have seen different non "in-rush" featured models show results all over the map. For HVAC work, clamp meters with that In-Rush feature is needed if you want to see what it is.
That’s exactly what I was looking for thank you
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5,226 Posts
I use the inrush to check that start caps/relays fire. the max function doesn't always catch it.
Hi....In the typical Max estimation, the info (current) is tested and the most extreme test is shown, yet the genuine greatest might have happened between the tests and all things considered you miss the genuine most extreme or inrush current that your searching for. In inrush current estimations leading it's a set off estimation and measures for an exceptionally brief timeframe and it doesn't rely upon tests, I believe it's a simple methodology.
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Fluke explains it here.
http://assets.fluke.com/appnotes/1629920_.pdf
http://assets.fluke.com/appnotes/1629920_.pdf
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yep, motor is basically running lra for fraction of second. that's also why breakers say hvac rated(or used to) or time delay on fuses, they "ignore" the initial high draw so they wont trip.
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