Proster Digital Clamp Meter TRMS 6000counts, 800A DC AC Current AC/DC Voltage NCV Continuity Capacitance Resistance Frequency Diode Hz Test, with1 PairTest Leads 1 Pair Alligator Clips

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Appareil simple et complet pour un usage courant (jeu de mots)

I needed to make some DC clamp-on current measurement around a few Amps. This meter only has one current range, 0-600A, so I had some concern. Mine showed an offset of -4.5A before zeroing, which is not at unusual for this type of measurement. I checked it on a test setup with a power supply, load, and Fluke DVM all in series. This meter agreed with the Fluke over the range I tested from 0.5 to 5A. The manual says the wire should be centered in the jaws. I move the wire around to all extremes in the jaws and it had no effect on the reading at the current levels I was testing. It also agreed with the Fluke exactly on voltage and resistance measurements. I wound up making measurements down to the 0.1A resolution level of the meter. The instructions say it's best to clamp the meter on the wire with the current off, zero the meter, and then turn on the current. I couldn't control the current independently so put the jaws near the wire, zeroed the meter, and then clamped it on. It worked well. One way to check is to flip the meter over and check the current again. If the measurements agree to within 0.1A with the sign reversed, you're good. With the supplied, leads, thermocouple temp probe, alligator clips and case, it's an amazing value. It even includes a tiny Philips driver for the battery door. The one thing it should include and doesn't is a magnifying glass to read the incredibly tiny print in the manual

安価ですがななか使い勝手が良い制度的には一般ユースでは問題ないと思います。

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