new found USB3.0 UM34C tester and new bigger power load LD25  - Page 1
Forum section: electronics / testgear

author: RD Tech
author_rank: Regular Contributor
timestamp: June 06, 2018, 07:36:39 am
content: after UM24C and UM25c, UM34c was show up ...UM34(C) link:https://www.aliexpress.com/store/product/RD-UM34-UM34C-for-APP-USB-3-0-Type-C-DC-Voltmeter-ammeter-voltage-current-meter/923042_32880908871.htmlLD24 linkhttps://www.aliexpress.com/store/product/RD-LD25-Electronic-Load-resistor-USB-Interface-Discharge-battery-test-LED-display-fan-adjustable-current-voltage/923042_32882318330.htmlUM34(C) video :https://youtu.be/zZCPJQrqKPU]https://youtu.be/zZCPJQrqKPU]https://youtu.be/zZCPJQrqKPUA, UM34(C) is better than UM24(C), same interface with UM25(C), have USB 3.0 port.B, only APP, not PC software, precision is better than UM24(C), not better than UM25C,C, LD24 is digital control USB load, have many protection(OVP,OPP,OTP) , can set the output state and current, big power 25w.

author: rloc
author_rank: Newbie
timestamp: June 07, 2018, 01:07:04 pm
content: The accuracy of UM34C is worse than that of UM25C. When to expect the appearance of UM35C? When will the PD protocol support?

author: RD Tech
author_rank: Regular Contributor
timestamp: June 08, 2018, 05:33:19 am
content: thank you for your reply , yes, but it is cheaper than UM25Cfor more better meter , it is designing , please wait ...

author: Candid
author_rank: Regular Contributor
timestamp: June 08, 2018, 03:06:54 pm
content: And the UM25C is capable of up to 5A not only 4A.But both still have a not complete USB-C port supportWhen on the UM25C I connect a device to the left USB-A male connector and the PSU to the right USB-A female connector I don't get a current reading. Is this the same with the UM34? It only works, when the PSU is connected to the male USB-A connector. But when you have several adapters it would be helpful that both directions work.With the UM25C I have the bug, that the mWh counter when reaching 99999mWh jumps to about 972xxmWh and from then counts to 99999mWh again and this all the time. So you cannot measure big power banks. Hope this is fixed with a successor to the UM25 what the UM34 is not for me.Features I would love to see in a real upgrade to the UM25(C):- Firmware should be upgradeable- integrated QC2/3-Trigger (very helpful for testing USB PSUs on an electronic load)- Especially QC3 trigger with stepping output Voltage in 0,2V steps would be nice- integrated Datalogger (so that you can download csv data later and configure the logger)- changeable timesetting for U/I graph display modeA product having the above features and that could compete with the expensive AVHzY CT-2 would be really fine. When a buffer battery is needed thinking about a gold cap or removable standard coin battery (e.g. LR44, AG13, CR2032) would be a good idea in order to send low cost worldwide without a battery placed.

author: RD Tech
author_rank: Regular Contributor
timestamp: June 09, 2018, 03:28:22 am
content: Thank you very much for your message and your suggestion,you should contact me on aliexpressfor measurement , it is one way to measure , not two side .for the capacitor, I did not test for all our products, as for our rule ,.when it is upto the limit, you need to clear zero . for biggest power bank, our meter can't , but there is not too many this .you should know we design products to sell , not only to play, we can add all function for your request, but the price will be very expensive , who will buy this high price , and some functuion they don't need ...for Type-c and trigger, we need to design one step by step, don't hurrythank you againhave a nice day

author: bitseeker
author_rank: Super Contributor
timestamp: June 09, 2018, 06:18:59 am
content: RD Tech,For the first bullet point on the LD25, "4 bit LED tube," I think you mean to say, "4-digit LED display."A bit is 1/8 of a byte and a tube is a cylindrical structure, such as a hose, or an electronic tube such as a vacuum tube or CRT. So, they don't fit in this situation.

author: RD Tech
author_rank: Regular Contributor
timestamp: June 09, 2018, 06:23:32 am
content: sorry, friendI will change it , because many people say 4 bit ,...thank you again

author: bitseeker
author_rank: Super Contributor
timestamp: June 09, 2018, 06:33:08 am
content: You're welcome, RD. Good luck with the new products.

author: RD Tech
author_rank: Regular Contributor
timestamp: June 09, 2018, 06:50:09 am
content: hope you like it and tell your more friends

author: bitseeker
author_rank: Super Contributor
timestamp: August 11, 2018, 08:17:46 am
content: Hi RD Tech,Nice new type-C meter.Note that the TC64 marketing materials have the same error as on the LD25. It says, "4 Bits Measurement." Four bits can only represent values from 0 to 15. This meter shows much more resolution than that. The displayed current of "2.968 A" is four digits of resolution and would require 12 bits (2968 = 1011 1001 1000), not four bits.I remember you said that lots of people say four bits, but it's incorrect and makes your product sound significantly worse than it is to everyone who understands what that specification means. If the error is because of a bad translation, make a poster that explains the correct terminology and put it on the wall in the department that is writing this incorrectly. Maybe that will help in the future.Also, the specification that is being talked about is resolution (how small of a change in value can be measured or displayed). Accuracy and precision, which are being used interchangeably in the marketing materials, are completely different things and not the same as resolution. An instrument can have good resolution, bad precision, and average accuracy all at the same time.Hope that helps and good luck with the new product.

author: RD Tech
author_rank: Regular Contributor
timestamp: August 11, 2018, 08:23:58 am
content: sorry, friendit is our worker mistakes, he did not change it . you are professional. it should be translate problem, i wil pay attentionthank you so much for your helpHope you like our products

author: bitseeker
author_rank: Super Contributor
timestamp: August 11, 2018, 08:32:35 am
content: 不用謝The products look good. Just need to fix the writing.

author: timgiles
author_rank: Regular Contributor
timestamp: August 11, 2018, 09:01:35 am
content: Been looking for these! Great new products and nice to see the port protectors are included - nice attention to detail. Order placed later today.

author: bitseeker
author_rank: Super Contributor
timestamp: August 11, 2018, 09:17:02 am
content: Banned. Oh, well.

author: marshaul
author_rank: Newbie
timestamp: September 10, 2018, 09:37:36 pm
content: Quote from: bitseeker on August 11, 2018, 09:17:02 amWhy, anyway?

author: bitseeker
author_rank: Super Contributor
timestamp: September 10, 2018, 11:40:40 pm
content: My guess is that the thread is in the wrong forum (should be in Buy/Sell/Wanted) and the images were really large.

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 11, 2018, 04:27:01 am
content: Quote from: bitseeker on September 10, 2018, 11:40:40 pmit can be moved, as usually happened. i dont know what hostility this forum got into, i dont see anyrules and regulationshere indicating you cant promote/discuss your product here. someone must have exercised power more than mandated, sad.Quote from: Daveright! this one innocent got banned, iirc this is not the first time.

author: timgiles
author_rank: Regular Contributor
timestamp: September 11, 2018, 06:42:11 am
content: I also thought it was prehaps a bit harsh to ban them without a post explaining why. Especially when it seemed to be someone connected to the company, developing products and getting feedback from the community.Anyway, I have two LD25s going through swedish customs at the moment :-) Same for the UM34C.

author: dpenev
author_rank: Regular Contributor
timestamp: September 11, 2018, 09:12:40 am
content: This company is manufacturing nice inexpensive products.I have tested few Chinese USB meters but they all are very inaccurate.UM25C is what i keep on my desk.The LD25 looks also nice and accurate even thought I have not tested it much.

author: bitseeker
author_rank: Super Contributor
timestamp: September 11, 2018, 10:34:10 pm
content: Yeah, I dunno. Only the one who did the banning knows. There may be more involved than what we see, and it may not have been appropriate to make the details public.

author: Muttley Snickers
author_rank: Unknown
timestamp: September 11, 2018, 11:00:23 pm
content: Quote from: bitseeker on September 11, 2018, 10:34:10 pmThe person who reported their activity and conduct would also know.For no good or apparent reason RD Tech's shill accounts which were also banned began posting the banner images shown at the start of this thread elsewhere on the forum. They created new threads in both the Test Equipment and Buy/Sell/Wanted sections in a silly effort to promote their products, one thread still remains and is linked below. The report along with the moderators actions at the time were justified, sadly and perhaps stupidly they cut their own throat.https://www.eevblog.com/forum/testgear/who-know-this-usb-meter-on-eevblog-video/

author: Mr. Scram
author_rank: Super Contributor
timestamp: September 11, 2018, 11:13:05 pm
content: Quote from: Mechatrommer on September 11, 2018, 04:27:01 amPretty much all Chinese manufacturers I've seen banned were caught using sock puppet accounts. No matter how helpful the main account is, that's crossing the line. Some have been caught more than once after being let back on.Without knowing the how and why I wouldn't make any definite statements about people being innocent.

author: bitseeker
author_rank: Super Contributor
timestamp: September 12, 2018, 01:40:45 am
content: Thanks for the clarification, guys.

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 12, 2018, 01:56:09 am
content: Quote from: Mr. Scram on September 11, 2018, 11:13:05 pmi dont see sock puppeting as a great offense or a clear prohibited in R&R. if its use for good purpose i dont see anything wrong with it. for example if one member want to act as normal person and use another username, at the same time use another name for company support or on behalf (professional attendee) etc. whats problem is spamming or insult, regardless of sock puppetting or not. and i dont see its happening here. any reason should and can be explained by the mod why he got banned. there is no such thing as "something behind the scene that cant be told", this is open forum. if this is happening to yourself then you'll know what its like. if this forum R&R is based on some complaint from unknown users then this is very sad, anybody can report anything if he/they dont like someone or want to make an organized attack on someone/country/race/religion etc.

author: Mr. Scram
author_rank: Super Contributor
timestamp: September 12, 2018, 02:30:55 am
content: Quote from: Mechatrommer on September 12, 2018, 01:56:09 amSock puppet accounts don't need to be explicitly prohibited, although the broader category of "commercial spam" that covers it actually is. It should be obvious to anyone that pretending to be a bystander and praising your own product or service is considered dishonest, misleading and a form of spam. The fact that this is done for financial and commercial gain isn't helping either. I don't think that people who don't understand this can be helped by anything else than a ban.Not that it matters. I don't make the rules. You don't make the rules. We are to accept the moderation presented to us. This isn't a democracy and the moderation team doesn't owe us an explanation. We're guests in someone else's house. Though I can only agree with being firm in regards to misleading or abusing the community.

author: hgg
author_rank: Frequent Contributor
timestamp: October 18, 2018, 05:14:07 pm
content: Is the UM34C display readable under bright sunlight?Thank you.

author: bugi
author_rank: Regular Contributor
timestamp: October 18, 2018, 08:36:43 pm
content: As you can see, RD Tech seems to be currently banned.. and I doubt many (if any) users of it have bothered to use in sunlight, let alone bright sunlight. So, a solid answer might be hard to come.Note that the UM34Cmodel can apparently be connected to an android app, so, depending on the app's features, one might consider the android device's display sunlight readability instead. Though not many displays are really sunlight readable, let alonebrightsunlight readable (I've yet to see one, excluding certain old B/W LCD and epaper types of course), so I wouldn't expect this cheap "LCD" thing to manage well.

author: hgg
author_rank: Frequent Contributor
timestamp: October 19, 2018, 04:39:24 am
content: I see. The bluetooth might be an option. I need it to monitor solar charging.Ok, thanks!

author: timgiles
author_rank: Regular Contributor
timestamp: October 19, 2018, 06:32:54 am
content: I have the whole range testers and would be happy to check - although - living in the mid to north of Sweden at the moment, the sun is hard to come by! The weather report says sun on Monday, Wednesday and Thursday this week coming. If you want to wait, I will test all of them, take a photo and give you my personal opinion.From owning them and using them on bright sunny days with the sun coming in directly via a double glazed window, I can say I have had no problems - in case that helps.

author: hgg
author_rank: Frequent Contributor
timestamp: October 19, 2018, 06:57:42 am
content: I would definitely wait..Thanks!

author: ledtester
author_rank: Super Contributor
timestamp: December 05, 2018, 11:04:09 am
content: Here's a rather comprehensive review of the UM34C...You can skip to the summary at 42 minutes into the video (and also find a precis in the youtube description.)

author: hgg
author_rank: Frequent Contributor
timestamp: May 11, 2019, 08:31:49 am
content: Quote from: timgiles on October 19, 2018, 06:32:54 amI am still waiting to get sunny in Sweeden...