Once I ran into a problem of measurement accuracy and I wrote about it, I read review multimeter HoldPeak HP890CNMade metrologist Alexander Poroshin. Multimeter for $ 25 seemed quite fantastic accuracy. Of course I ordered it.
Multimeter has 6000 counts floating point, and measures the DC and AC voltage of any shape (TrueRMS), DC and AC current, resistance, capacity, frequency, duty cycle, temperature coefficient of transistor gain (hfe), tests diodes detects electromagnetic radiation (search hidden wiring). There backlight function, cutoff, relative measurements, data retention, max / min values, the mechanical protection of the connection to the wrong connector.
Includes high-quality test leads, temperature probe and carrying case.
Display backlighting is automatically activated when low lighting conditions.
All segments of the display (some are not used).
At different positions of the connectors overlap handle mechanically shuttered.
The manufacturer states sufficiently high measurement accuracy (for example, a DC voltage of 60V ± range (+ 0.5% 2) with a resolution of 0.01V, an AC voltage in the range of 600 V ± (1 + 3%) solution with 0.1 V), but from the measurements was much Alexander multimeter skilful.
I tested the DC voltage measurement via the voltage source model ( http://ammo1.livejournal.com/579177.html). The first column is the value of reference voltage, the second - reading the meter.
9,99724 10,00
7,49970 7,50
4,99729 5,001
2,49909 2,501
Traditionally, looked as measured mains voltage my multimeters and wattmeter Robiton PM-2 ( http://ammo1.livejournal.com/714591.html).
Of course, the voltage on the network is constantly changing, and the testimony "jump".
Compared with HoldPeak HP890CN readings Mastech MY65 at 0.2-0.5 V lower readings UNI-T UT61E at 1-1.2 V above indications UNI-T UT33A at 1-1.2 V below shows wattmeter Robiton all exactly, but up to Volt. It is hoped that HoldPeak HP890CN has the highest accuracy.
upd.: Measuring accuracy AC voltage is confirmed. I gave a multimeter in one of the NMI and there checked his testimony when connected to a reference voltage. At 230 V showed HoldPeak 230.2 V, at a voltage of 210 V - 210.1 B.
This device allows you to achieve high accuracy due to the fact that the adjustment is not analog Trimmer and software calibration.
I bought the device for $ 25.65 here with fast delivery CPCR (brought home a week later). The Survey is a reference to Alexander Tomtop store. Now he's worth $ 27, but periodically there are stocks and meter start to sell at $ 17.
© 2016 Alex Nadozhin
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