Products > Test Equipment
Fixture to safely measure mains AC amperage
bdunham7:
--- Quote from: fazalmajid on June 06, 2022, 05:49:00 pm ---I am trying to calibrate IoT power plugs with power metering function (2Nice/Gosund UP111) running the Tasmota open-source firmware, using a calibrated multimeter (or inline power meter) as a reference. So I would put a purely resistive load like heat lamps (since incandescent bulbs are hard to get now) on a dimmer, change the dimmer until I get 10W, 20W, 30W etc on the calibrated meter, then plug it into the UP111, see its readings and tabulate them. Of course inductive loads and power factor correction introduce another wrinkle.
--- End quote ---
If you are wanting a PF near 1.0, you need to use a variac and not a dimmer. A phase-control (dimmer) circuit is likely going to result in some pretty poor results from current clamps and probably your IOT power plugs. A P3 KillAWatt or the (direct) amp measurement of a good DMM with TRMS will be much better.
nightfire:
Some other version sold in germany via Conrad etc.:
https://ht-instruments.de/produkte/optionales-zubehor/line-splitter/
But: With those comparatively low currents ordinary current clamps have lots of tolerance- with a light bulb of 10 Watts or maybe 100 Watts, we are talking at 230 VAC something around 40mA to maybe 150 mA - thats not much for those big clamps that go easily up to 400 A.
And leakage current clamps usually work well below 20 mA.
fazalmajid:
So there seems to be a UK BS1363 version of the AC line splitters, the T.I.S. 454. Unfortunately, it also seems to be discontinued...
It does seem they have a newer version, the T.I.S. 455, but I can't find any resellers yet. It seems to be just a rebadged version of the HT Splitter that nightfire mentioned.
factory:
Did you check stock at your nearest store, my local one claims to have two in stock.
David
themadhippy:
If you can live without the x10 just wire a plug and socket up in singles
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