New UNI-T UT210E PRO problem

[sky666]

Yes, the chipset is the same as the UNI-T 210E. The same pcb, rev.1 also.  I cannot find any difference at least from the upper side.
I am planing to do this soon, I just need to get the right equipment first.

[Trader]

I am planing to do this soon, I just need to get the right equipment first.

Did you check this link?

https://thearduinoshed.wordpress.com/2020/04/13/uni-t-ut210e-current-clamp-hacking/

You don't need an "AVR Programmer", you can use the "SDA and SCL" connections.

[sky666]

I will buy the EEPROM USB Programmer first anyway. The EEPROM version can be seen in the picture. I hope this type of AVR programmer works.

[Stinger]

Hello,

This new UT-210E Pro can measure frequencies and see more capacitance. The UT-211B with 6000 counts can this.

I hope it can be hackable like classic version.

[sky666]

Hello,

This new UT-210E Pro can measure frequencies and see more capacitance. The UT-211B with 6000 counts can this.

I hope it can be hackable like classic version.

EEPROM can be programmed, I cannot see any significant changes.
We'll see.

[Trader]

Hello,

This new UT-210E Pro can measure frequencies and see more capacitance. The UT-211B with 6000 counts can this.

I hope it can be hackable like classic version.

Any reason for the UNI-T UT211B to cost around 2x the price of UT210E Pro, since they have basically the same features? (the only significative difference is 6k vs 2k counts, but you can hack the UT210E to up 10k counts)

[Stinger]

The UT-211B are overpriced. No standard fuses for cost.
But he can measure current at 6000 counts in mA when zeroing offset display.

[odarek]

Hi sky666,

could you please unscrew the back cover and take some photos with components ids and put them here?
so that we can compare your version of the meter "UT-210E PRO" with model "UT-210E" (without PRO)

Have you tried to improve your meter?

Best regards,
Darek

[Gaft]

Hi sky666,

could you please unscrew the back cover and take some photos with components ids and put them here?
so that we can compare your version of the meter "UT-210E PRO" with model "UT-210E" (without PRO)

Have you tried to improve your meter?

Best regards,
Darek

here is my uni-t ut210e

[jfiresto]

Any reason for the UNI-T UT211B to cost around 2x the price of UT210E Pro, since they have basically the same features? (the only significative difference is 6k vs 2k counts, but you can hack the UT210E to up 10k counts)

The UT-211B advertises 0.1mA resolution and can potentially measure such low currents, which makes it "perfect for anyone requiring high precision and accurate results when working with electronics, such as troubleshooting solar power systems current load, electrical cars, etc.". If you dig into the product manual, however, you discover its high resolution (and stated accuracy) is only for AC. Was it meant to have 0.1mA resolution on DC? I tend to the notion that measuring low DC currents with a clamp-on meter is not that easy.

[Stinger]

Hello,

Are you hacked your Pro version to 9999 counts ? Possibility to active temperature measurement ?

[sky666]

I apologize for the delay. I got the AVR programmer some time ago, the first order was lost during shipping. Honestly, after so much waiting, I changed my mind. Somehow I lost my interest in modifying the AVR programmer for now (due to 5V voltage).
These are the pictures from the device.

[radiolistener]

Here is my UT210E PRO.

Just out of the box it shown DC current offset about 0.022 mA. But when I played with short circuit measurement of 0.04 Ω wire I caught a drift about 0.2-0.5 Amps.

I investigated the issue and found that it happens due to a capacitor on the output terminals of my PSU. The capacitor is 532 uF and when I connect wire it cause high current pulse which value depends on capacitor voltage charge. And it looks that this pulse cause clamp magnetization. Because when I apply this pulse in reverse polarity it leads to reverse current offset to opposite sign.

So, I found the way to demagnetize clamp. I just apply short circuit pulse (in reverse polarity to current offset) and look at current offset change. Then reduce voltage for a little on the PSU output and apply pulse in reverse polarity. And retry until current offset will be minimized to zero.

I found that it's better to put clamp meter on wire when the current already flows through the wire. Because if you switch on power with clamp meter it may cause high current pulse and lead to magnetization of the clamp meter. Switch with 0.5 Amp pulse almost doesn't affect current offset. But switch with 70-100 Amps leads to some current offset and requires demagnetization.

[AlexTee]

Is that normal, that I get different readings when measuring direct and returning DC current of a circuit? It always shows lower current when negative. Surely, I zero the meter before taking measurements.

[SkullKill]

FYI the UT210E Pro has the EEPROM AT24C08A which has 1Kb of memory instead of the AT24C02A which has 256b or memory.

attached is my stock dump. and how i connected the programmer. the clamp meter was on 2A mode,





 UT210E-Stock08A-BIN.zip (0.34 kB - downloaded 122 times.)

[Boo]

Scratching could be them grinding the two edges flat to meet flush.

Well, according to that chart it only has the one advantage that it measures frequency. Seems kind of pointless for most people.
edit: I'm blind.

Apologies from another blind person but could someone kindly point out what other technical differences there are between the UT210E  and the UT210E Pro than the Frequency measurement ?  I've gone up and down the image in post #2 but cannot see anything else ? 

Thanks,

Boo