SURPEER AV4 True RMS 4.5 Digit Multimeter

[Kosmic]

Same here. Overall, it’s working fine. Resolution and accuracy are great. Measurement speed is slow as hell though.

[rsjsouza]

I have used mine up to 850 VDC and they both worked fine.

I am not sure if you are referring to my previous comment about the 30V on the inputs. In my case I was highlighting the issue in non-voltage ranges (Ω, )))), cap, diode), - i.e., the meter is quite unforgiving to user error. 

[Fungus]

I have used mine up to 850 VDC and they both worked fine.

Sure.

The input protection circuitry is there for when you make mistakes or when the voltage is way outside what you expect.

If you have all the leads and the range selector in the right places then even a free DT830B will measure 1000V. I wouldn't like to spin the dial with it connected though. 

[joeqsmith]

Topic reminds me of Voltlog's video.

https://youtu.be/pnv5qJoWIak

[graybeard]

[rsjsouza]

These are my results with the DMMCheck Plus:

[zwillhill]

@HKJ Can you dump the EEPROM of the Zeast 282 and post it here? I wonder if that can be used to enable the REL button.

Hi,guys!
EEPROM of the Hy-19E(Zeast 282) it is possible to download at this link  https://yadi.sk/d/fy7nRoX_3Lqzsf. This dump became available thanks to the review on a multimeter from the user of uncle_sem at the Russian-speaking forum https://mysku.ru/blog/china-stores/54451.html

There are two positions seems may modify something base on my web search (base on other DTM0660 models and not tested!):
1. 10H, 11H data corresponds to the division value 10000, 12H, 13H corresponds to the shift upper limit of 9200, 13H, 14H corresponds to the shift off line 880(UT139B)
2. Description of the address in the form:
24H, 25H is the NCV base (threshold, threshold), that is, the mV value that has an initial response to the start of the mains induction.
26H, 27H for NCV resolution, in general, for UT139C is the first short bar of the display to the second short bar (second to third, third to fourth) display required The mV value is the mV value required for the first display light to be displayed after the first display light is displayed.
You can adjust the NCV starting sensitivity by changing the address 24H value, increase the sensitivity and increase the sensitivity.
The numerical choice is generally:
28, 32, 64, 96, FA
Specific model reference value: UT139C, the value is FA, UT139B is FA, UT210E is 64, and UT211B is 96.

sorry for my bad English

[zwillhill]

I wonder if that rendering is accurate... *two* large chips on board, plus an eeprom.

The design is similar to the HYELEC MS8236/PeakMeter PM8236, two chips solution (DTA0660 (6000 counts) + Hycon HY11P14) + eeprom

Maybe this one is HY3131 (50,000 counts DMM Analog Front End) + HY11P14

Hycon HY3131
http://www.hycontek.com/en/products-en/3413

? HYELEC MS8236 True – RMS.
https://mysku.ru/blog/china-stores/32869.html



not many DMM chipset has NCV function. Hycon chipset is one of them has NCV

The chipset in right position seems be HY12P65, the left one maybe HY11P series.
http://lygte-info.dk/review/DMMZeast282%20UK.html

[graybeard]

There are more of these WINHY 28II 20000 count multimeters for sale at Ali Express at the moment.  The REL and Peak measurement keys do not work, but everything else does.  The two I have work well and are very stable.  They meet their accuracy spec and do a much better job of measuring capacitance than my 121GW.  I have measured voltages up to 850V.  The frequency counter works up to 20 MHz.

I have two SURPEER AV4 units that I am very happy with (for the price) and I just ordered one more for $17.80 with free shipping.  It appears to be the same meter and the board (shown in feedback).  Ali Express is now adding $1.82 California Sales tax so I am paying $19.62.