USB Dummy Load with Extras! - 12v Solar Shed
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- Опубликовано: 9 фев 2025
- Another product direct from China where the manufacturers have decided to add additional features to add a few pounds to the price.
In this video I put this USB electronic load through it's paces, check the accuracy and decide whether it's any good or not.
I bought this product from ebay: goo.gl/xM87Hn
❗️These links are affiliated and I may earn a small commission if you purchase❗️
Very cool A nice upgrade to the original version that I have. I'm not so bothered about the screen, but being able to directly connect cables to compare the difference between them is very handy.
+Gadget Addict Glad to be of service.
It looks like a nice little device Adam.
Thanks for the video
Ok, it can be calibrated by holding down the button while inserting it into the USB socket. Pressing it twice brings up the calibration display. Then you will need to use a 2A load and press the button twice again to calibrate it. To calibrate the voltage you will need to press the button once after the current calibration.
Cheers - I'm going to try this and I'll upload a short update video if I can get it working!
I got one.
Looks like they have added more ports.
From the Fine Adjust Pot you get Mini USB, USB type C, Micro USB, Apple Lightning, then a System Power which just powers the board and does not get put under a test load.
I believe that the current reading difference is because the external meter is reading the LOAD current PLUS the module current; while the module is providing the more accurate measurement of only the LOAD current.
Adam you find some really good items on Ebay. Enjoyed this. I may as well buy one just to play around. many thanks. Mikebkk
I wish I could get one of those they look so cool
Neat device. Is there a secret calibration menu I wonder?
+Julian Ilett I did try to find one. If you know of any tips do let me know :-)
Hold the button befor you power it up
I actually read that in your own voice...
Another well done review . Just bought the simple oled meter of the same brand after watching your video. The double meter of last week seems to not show the voltage over the d lines and probably another loss because of an extra small cable.
I like these loads but yet fail to see the day to day use.
+Luc Peeters You're right - no data line details on the dual led USB power monitor I looked at the other week. A constant load is useful for testing cables and power supplies. If you use a phone for example as your load it'll pull highest currents when the battery is low and much lower current when the battery is getting higher - so you can always predict how much current it should be pulling. It's not something everyone wants, but I think I'll find it useful.
Thanks for the kind comments.
At 3:38 when the fan starts, the load current doesn't change.
As the fan is running off the battery under test, shouldn't its current be included in the reading.
When you were checking calibration, was the fan running Adam. if so that would explain the difference in current readings.
great Channel
I have the DROK version, identical to yours except yours is mounted on an acrylic platform (much better).
I had one of those but i pluged it into the second usb port and had the voltage set to high while the current was at its max 3 amps and it fried it, it can only go to 3 amps and 11v or a higher votage but lower amperage
The difference between measuring devices on the amperage was 10% that's too much. Although it was lower on the second device it makes me wonder if the loss in amperage is due to the internal resistance of the first measuring device, although typically the resistance is very low on measuring devices to ensure accurate readings, since the load is going through the two into one USB, (which also has some resistance), and then into the first meter and then finally into the second measuring device.
However, even then I doubt that it would be enough resistance to make an almost 10% difference in amp readings.
It would have been interesting if you had also measured the load individually to see if you still had the same difference.
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Hi Adam, nice video, could you try to contact the seller and ask for a calibration option? It is a nice tester though!
+Javier Palla Lorden I'll do that. Thanks.
I have one of these. I purchased it to test power banks, but it has a major flaw. You are taking the power to run the electronics from the test source so it isn't super accurate. I wish they has made it run off a power adapter so it is more true to it's readings.
+C MJ It was pretty inaccurate out of the box, but I found the calibrate menu (have a look at my other videos) but any deviation from the calibration figure and things soon get inaccurate again.
It's a handy load to couple up with an accurate meter - but the inbuilt meter is just a guide really.
Thanks for your comments.
C MJ " I wish they has made it run off a power adapter " >> YES THEY DO make a model that runs off a separate power pack. Look at this picture: www.droking.com/wp-content/uploads/2017/03/200186_15.jpg - see how it has a switch near the input USB, plus a white JST-XH and a MicroUSB socket. The model in this video is the (NOT cheaper) one without that external power input
They now have.
There is a SYS_PWR microUSB port which powers the electronics only
Well this is crap unless you power the FAN externally. Else the Fan spins up and down constantly disrupting the set power load. So in hotter environment you get incorrect readings.
+juliusvalentinas I don’t think that is true. The shunt resistor is in circuit before anything else, so if the fan kicks in the microcontroller will adjust the duty on the load Transistor to compensate. It does mean your minimum load might be slightly higher, but then at minimum settings the fan may never come on.
Well I have same load but without lcd screen, I use external power monitor. When fan starts to spin the e load will pull more current, when fan stops the current will drop. So the e load does not compensate and keep the preset settings constant. The hotter it gets the bigger the error.
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