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Clamp ammeter on 12/3 cable

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Bob Taylor:
The way I have done this is with my Fluke 33. It will give average, instantaneous, and minimum RMS amperages. It's a discontinued meter but I'm sure there are similar out there. This will let you know what that Bass Drum is actually pulling for that punch and let you plan how much current you need to keep Sub Amps from dropping out or that Genny from tripping.

And another thing that can be done while measuring low currents on a high current meter, wrap the wire thru the jaws twice and divide the reading by 2. Or 3 times and divide by 3...

Bob T

Stephen Swaffer:
They are are out of the OP's price range but Fluke has added a Fluke Connect feature that bluetooth's to a smart phone-the meters have an FC suffic in their model number.  Not much more than an equivalent non-FC meter but it is incredibly powerful for the cost-from "watching" a meter from 200' feet away to recording a reading over a time period I find them very handy.  (Using a display adapter with the phone allows you to project a live meter reading making for a useful teaching tool).

Kevin_Tisdall:

--- Quote from: Tim McCulloch on February 19, 2023, 12:09:19 AM ---You seek a "Kill-a-Watt."  Some are direct-reading Ammeters and others are a 'break out loop' you can clamp around.

Jeff is spot on about fast current changes that your meter is unlikely to display but you'll still get a idea of how much current is used.

--- End quote ---


Thanks all for the education.   I saw the kill-a-watt units but im a little reluctant to put something that might fail between my speakers and the power source.  Are they pretty reliabl at least to keep passing power through?

--kevin

Jeff Lelko:

--- Quote from: Kevin_Tisdall on February 25, 2023, 11:49:53 AM ---
Thanks all for the education.   I saw the kill-a-watt units but im a little reluctant to put something that might fail between my speakers and the power source.  Are they pretty reliabl at least to keep passing power through?

--- End quote ---

I’ve had mine for probably 15 years now and it still works like day one.  However, I view the Kill-o-watt as a bench testing tool and not something that belongs inline with equipment on a job.  For that you’d either want to use your clamp-on meter around a single conductor if possible, or utilize an UPS or power distro that gives realtime current measurements.  Even then you’ll need to use common sense to determine if the measurements you see are “valid”.  Hope this helps!

Kevin_Tisdall:

--- Quote from: Jeff Lelko on February 25, 2023, 02:50:40 PM ---I’ve had mine for probably 15 years now and it still works like day one.  However, I view the Kill-o-watt as a bench testing tool and not something that belongs inline with equipment on a job.  For that you’d either want to use your clamp-on meter around a single conductor if possible, or utilize an UPS or power distro that gives realtime current measurements.  Even then you’ll need to use common sense to determine if the measurements you see are “valid”.  Hope this helps!

--- End quote ---

Thanks Jeff.  My feelings pretty much the same.

--kevin

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