#023

Here is a look at the inner workings of the UM34C USB dongle meter, and of course some testing.
The bluetooth function on this is great, and the app works as expected - only annoyance is that when power is lost to the meter you have to disconnect and when saving the logged data, the old file gets overwritten.
Nonetheless, it is a great toll for diagnostics, data logging and monitoring on USB charging - quality product from RD tech.
Links to products on Banggood:
USB constant current electronic load: bit.ly/2pck7y7
USB 3.0 Type-C DC Voltmeter Ammeter Voltage Current Meter: bit.ly/2NQL1cH
USB SMART Charger bit.ly/2QBpZx6
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[@sofa-lofa4241]

The Ruideng is a bargain at £15, I have a couple of different usb meters and this compares with my YZX studio 1270 which was £35 The Ruideng app is really nice, my YZX has BT output but it is just a string of values and you have to use an app like blueterm to capture and XL to make a graph, this is much easier!

[@MCsCreations]

Really nice, man. Ruideng has some awesome products. I have a DPS3205, with which I build a regulated power supply. Works as a charm!

[@randomtronic]

Yep! And my bench supply is built around 2 units of DPS30V5A-L from these guys. Awesome kit!

[@javierpallalorden]

One of the best USB power meter.

[@randomtronic]

Yes, quite advanced. I really like it.

[@javierpallalorden]

The PC and Android app is very nice. Sometimes I just use it als a multimeter.

[@kyoudaiken]

Where do you get axial high current capable cables to make your own USB cables?

[@randomtronic]

Next video, I will show how I did it!

[@barrygreengrass3379]

Chris very informative video as usual, what’s the spec of the cable you used to make the USB cable, and where can I get the cable from please? I’m in the UK.

[@randomtronic]

Video coming soon. Cable was made by me from various individual wires, then I sleeved it. I will show shortly what and how in detail. Thanks!

[@gartmorn]

I made a wee bluetooth speaker box using two 3 watt speakers. I fed it from a usb supply using a cheap generic cable and it was terrible. Either not working at all or breaking up. I decided to use a more expensive cable and hey presto it works a treat! The cheap cables really have poor load handling capabilities and are only good for low current draw applications.

[@randomtronic]

@@gartmorn Spot on. That is exactly my experience and the reason why I decided to go and make my own cables.

[@drfaustens4504]

There is a disclaimer on the Amazon site the bluetooth only works with Android 5.0; it certainly does not work with ver 4.4.2 on my cell phone. I does, however, work on my tablet running v 5.1.1) which is better anyway. The meter itself seems as accurate as any others I've come across. Documentation is unimpressive, one can figure it out in time for the next release.