A review and test of an inexpensive multimeter sold under Wal-Mart's Hyper Tough brand name. It turns out to be surprisingly good for such an inexpensive meter.
0-21:43 Introduction and Detailed Overview
21:44 AC Line Voltage Check
22:24 Why You Might Want a True RMS Meter
(This inexpensive meter is not capable of making true RMS measurements. "Average responding" is something of an oversimplification and not a totally correct phrasing. It is how meters without TRMS capability are usually identified. Meters without TRMS capability are calibrated such that they'll only display the correct AC voltage (or current) when the incoming waveform is a sine wave (along with the voltage and current being in phase with one another). It's OK to have a meter without TRMS capability as long as you know of its limitations and understand when it might "lie" to you.)
24:36 AC and DC Voltage Measurement Comments
(DT-830 meters usually indicate a spurious AC voltage as being present if they are mistakenly set to measure AC voltage while connected to a source of DC voltage. Part of this problem stems from their inputs typically being DC coupled even in the AC voltage measurement mode. The Hyper Tough meter is not susceptible to this issue.)
26:20 Test Lead Compatibility
26:42 Resistance Measurement/Accuracy Tests
30:22 Diode Test Range and Limitations
31:21 Battery Test Ranges
33:07 Low Voltage DC Accuracy Tests
34:05 Low Battery Behavior Test Setup
34:34 Current Testing Limitations
35:34 Low Battery Behavior Test
39:20 Higher Voltage DC Accuracy Tests (0-32 VDC)
42:18 AC Voltage Accuracy Tests (0-152 VAC)
44:33 Final Comments
It's my understanding that the minimum voltage for a CAT III rating is 600 volts, not 300. Make of that what you may. I "spiked" it with a few 1000VDC pulses and it lived. However, that's nothing like a real world test, or even an approximation to one.
Негізгі бет Ғылым және технология Hyper Tough 10711WDI / All-Sun EM390C Digital Multimeter Review
Пікірлер: 110