ZKE Tech EBD-M05 help

HenrysCat · 2019-03-23T11:03:37.000Z

Hi all, just got one these below and starting to have play and run in to a problem, not sure if it's me doing something wrong or I am just reading it wrong but perhaps you can help.

It is connected to a 4 wire battery holder as below, A+ to A+, A- to A-, V+ to V+, V- to V-

But I am not getting any current reading, always at 0.000A ?

Any ideas what I am doing wrong here?

Thanks

HenrysCat · 2019-03-23T12:43:30.000Z

Solved it after an hour of head scratching, just in case anyone is wondering, I did not have the battery rack pushed up tight, the little gold pin measures voltage and the silver outer measures current, they both need to connect, I will now order a better quality rack

HenrysCat · 2019-03-24T08:59:15.000Z

Has anyone here got one of these? it's supposed to go up to 5A, but I can't get it to draw more than about 2.5A, I tested my best battery, a fully charged Sofirn 26650, and I have also calibrated the unit.

Barkuti · 2019-12-02T01:02:04.000Z

Hello!

Remembering past comments of yours concerning the EBD-M05 device HenrysCat, I came here to ask if it supports fully customizable testing voltage range. This means, is it possible to obtain a discharge graph from and to, let's say 3.7 to 3.0 volts?

Guess you finally solved the “no more than 2.5 A discharge” problem. What was it?

Yes, I'm at the verge of getting one.

HenrysCat · 2019-12-02T09:23:47.000Z

Yes you can as screenshot,

The 2.5A problem is due to USB ports only being able to deliver 2.5A so if I want more than that, I have use a 5A USB hub to boost the power.

I think for the price you can't go wrong ;)

One other I should mention is the fan is very noisy and mine failed after a few days, so I replaced it with a GDT4010S12B you can buy just about anywhere, got mine from eBay.

Barkuti · 2019-12-02T11:33:00.000Z

Thanks for pinpointing the fan issue thing, will add some replacement unit(s) ;-) to my cart. Will it fit a 40x40x15 mm?

Concerning the 5A USB limitation, can't see what is the point or reason right now, the current between meter and holder goes via a wire LoL.

Thanks.

HenrysCat · 2019-12-02T12:34:19.000Z

Im surprised you said that given some of the useful knowledge you share here, it’s a constant current load tester, the load will sink the programmed current independently from the output voltage which is typically forced by the voltage source connected to it (for example a battery)

keysight.com

5992-3625.pdf

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Barkuti · 2019-12-02T16:34:46.000Z

I don't have an EBD-M05 in my hands, don't be surprised. Since the USB port is for it to connect to the computer, why does it need to carry 5A of current? It is nonsense.

HenrysCat · 2019-12-02T16:57:59.000Z

The USB is for power and data to pc, I did explain it and that pdf goes in to detail, if you read my post and pdf it makes perfect sense.

You can plug the device in to a power bank and test with out pc also.

Barkuti · 2019-12-02T18:08:14.000Z

HenrysCat:

The USB is for power and data to pc, …

Still, I don't see why does the device needs two USB connections or a hub for additional power unless it is particularly very power hungry. Maximum USB2.0 current is 500 mA (≈ 2.5 W) per port with power negotiation, or 100 mA (≈ 0.5 W) without it.

Barkuti · 2020-02-04T04:58:59.000Z

Uufff! Finally decided to try this goddamned thing, and it either is refusing to work, or the computer I am using cannot recognize it. I get a "device descriptor request failed, error 43" upon plugging the EBD-M05 via USB to my laptop. :facepalm: :|

HenrysCat · 2020-02-04T07:22:47.000Z

Have you installed the software and the USB port driver? in that order.

flydiver · 2020-02-04T15:55:47.000Z

The battery holder should be fine. I have 2. There are small thumb screws on the bottom that permit you to move the contact for different sized batteries. Adjust it.

Barkuti · 2020-02-04T18:39:43.000Z

Yes, the battery holder is fine. With it connected the EBD-M05 senses battery voltage and even seemed to start and stop discharging (!) upon pressing the knob.

However, after installing the software this Windows machine doesn't recognizes de EBD-M05 at all. Whether I unplug and replug the device, doesn't matters (no USB plug-in sound or whatever). Wellp, my "cable" was the culprit. I was using a short USB A to type-C cable, with an USB type-C female to micro-B male adapter (this cheap type from eBay). After I swapped the cable, problem solved. Thank God. (^̮^)

The device powers itself from the battery when not plugged to computer, I guess this isn't ideal unless the device deducts its power drain from the measurements when not plugged. No battery tested yet, of course.

By the way, there are some newer versions of the USB to UART RS232 drivers @ Prolific, they're not strictly necessary but I tinkered with the stuff while diagnosing what was going on.

Did someone took a look under the heatsink to see if the MOSFET comes with thermal paste?

Barkuti · 2020-02-09T12:38:53.000Z

A little update for the sake of it.

The smartasses who made the software decided to use csv files as default for data. Problem is that, with certain regional settings, the default decimal separator is comma. When your data figures have commas and you also use commas as data separators, the result is a mess. So, my first cell run ended up @#$% for various reasons, but anyway since I am testing a pack of 5 “Colaier G35” cells I decided to do some first run discharges down to 2.5 V, at 0.64 and 1 A, and by the looks of them I can assure the cells must be 3200 mAh manufacturer rated. The default decimal separator think is no big deal, but anyway I've changed mine because when importing data for displaying graphs it always defaults to csv in the open file dialog (matter of preference too).

I am right now doing a run at 0.5 A down to 2.8 V (first #5 cell clocked 3096.5 mAh), and will likely do a run at 5 A.

Barkuti · 2020-02-16T17:33:33.000Z

Here are some discharge curves and images I made for the sake of it. Test conditions: room temperature 16 - 18°.

Colaier G35 "3500 mAh" (cough!) at 0.5 and 5 A, 5 cells:

Clearly some 3200 mAh "down to 2.5 V" rated cells (verified with down to 2.5 V discharges at 0.64 and 1 A).

Colaier G35 at 5 A (5 cells) and Samsung ICR18650-30A at 5 A and 4.2 V (2 cells) comparison:

Distinct "heating valley" during the first minutes of the 30A cells' discharge.

Wow! I'm certainly surprised to see so "bent down" curves, even despite the cold temperature. Comparing my ICR18650-30A curves with similar cells from HKJ's tests (Samsung ICR18650-28A and Samsung ICR18650-30B), they certainly look worse. Wonder about cell grade.