UT620B vs ETCR 3620 (Beast and the Beauty)

[@grigoreman7198]

Thanks for the comparison. Have a nice day!

[@esaugalvez]

Thank you !

[@michelgauvin2473]

I bought the ETCR 3640, which has a higher resolution of 1 micro-ohm, to satisfy my curiosity. With the ETCR 3640, I had the same problem of stability and reading accuracy that you had in the low ranges with the ETCR 3620. However, by using double-tipped kelvin probes that I own, and also by simply using independent cables with alligator clips for current on terminals C1 and C2 on the device and two multimeter probes for voltage on terminals P1 and P2, I managed to get accurate and stable readings. The problem with the test leads that come with the ETCR 3640, and probably also with the 3620, is that the spring in each of the clamps short-circuits both sides of the clamps when the clamp jaws are open or closed. This means that the tip resistance on each side of the clamps adds an error depending on the current injected by the device. It's a very bad decision by ETCR to supply such poorly designed cables. Many buyers will come to the same conclusion as you, that their device is not accurate, and will do the same as you, return it and make bad comments about this product. I'm going to keep it because I've found the problem and have a solution to fix it. But that's not the only thing I find rather disappointing about this device. The ETCR 3640's case and buttons are made of cheap hard plastic, and the rotary selector for range selection doesn't work very well. Also, the display is minimalist and lacks the identification above the buttons for their second functions. It seems that ETCR's device is still in the prototype stage, and that they abandoned its development too soon before releasing it to the market.

[@esaugalvez]

Thanks for the feedback. I have 2 different kelvin cables that I know they are in good condition, but still, results are not stable. Honestly, there is a cheaper and most stable meter on AliExpress RC3563, the only problem with this is that when you short cables, readings are no exactly “0”. But readings are pretty much accurate and much more stable than that ETCR useless meter. Nice talking to you!

[@michelgauvin2473]

Could these huge measurement errors in the ETCR micro-ohm tester be caused by the probes? Can the tester be calibrated? I was going to order it, but now I think I'll pass on this one....

[@esaugalvez]

Good thinking. That’s a lovely tiny meter, i tried every posible option, I changed probes thinking it could be the problem, I calibrated probes many times. Sometimes results were close to what I expected, but must of the times were not. I tried with different wire gauges and same behavior. So I definitely not recommend it. I have an expensive Hioki meter and even 2 cheap Chinese ones. I would recommend you a cheap Chinese one. RC3563 that’s the model, that’s an orange color comes with 3 different sets of probes that one is for testing batteries, in case you want to buy something cheap and reliable

[@michelgauvin2473]

@@esaugalvezThe RC3563 battery tester can be use also for passive resistances and contacts?

[@esaugalvez]

@@michelgauvin2473 i think so. It gives very similar results as a Hioki does. That’s why I am suggesting that particular model 👍

[@michelgauvin2473]

@@esaugalvez So I'm going to order the RC3563 that you recommend. The Hioki is definitely much better, I'm sure, but you have to have a need for high quality and frequent measurements to pay 20 times more for a Hioki... Thank you for your advice.

[@michelgauvin2473]

@@esaugalvez I finally bought the RC3563 model you recommended and also the ETCR 3640 which has a resolution of 1 micro-ohm to satisfy my curiosity. With the ETCR, I had the same problem of stability and reading accuracy that you had in the low ranges. However, by replacing the probes included with the device and using double-tipped kelvin probes that I own, as well as simply using four independent cables with alligator clips for current and multimeter probes for voltage, I managed to get accurate and stable readings. Yet the clamps included with the device have good gold-plated connections and I checked that they could take a fairly high current (5 amps for the 1 milli-ohms range). I can't explain why the included clamps don't give good low-range readings. Maybe the current injection and voltage reading points are too close together and interfere with each other? I've also tried with other cables with kelvin clamps that I have and the same problem appears. As for the RC3563, it works well and the readings are stable. However, they're not accurate in the hundreds of micro-ohms range. The ETCR 3640's case and buttons are made of cheap rigid plastic, and the rotary selector for range selection doesn't work very well. Also, the display is minimalist and lacks the identification above the buttons for their second functions. It looks as though this ETCR device is still in the prototype stage, and that they abandoned its development too soon before releasing it to the market. If Chinese companies like Aneng and Habotest manage to sell inexpensive devices with good casings and finish, I don't see why ETCR can't do it.

[@anissbenthami]

thank you for this video it's useful

[@esaugalvez]

You are welcome, 👍

[@cdanielglugo]

A su pinshi maye, no entendí ni mergas... subs por favor. Naaaa... Saludos. Los tacómetros de la misma marca UNIT, es barato pero muy funcionales.

[@esaugalvez]

Gracias es que el vendedor se puso romántico y este video es pa defender el hecho de que el medidor no es bueno. Y si la marca uniT es buena. No para meterse a un concurso pero saca de apuros 😅😅

[@lupojacobo9892]

Tienes razón. Yo compre el multimetro de pizza y la verdad me gusto mucho. Y eso que uso Agilent Keysight y aparatos Sencor. Pero Uni T por el precio esta mas que exelente. Solo que esperar que dure lo suficiente también o que no se salga de calibration muy pronto.

[@esaugalvez]

Keysight son caros. Cuando se puede hay que comprar herramienta buena, cuando no alcanza, ni modo la que se pueda. Saludos