Test/review of Electronic load ZKE EBD-USB

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HKJ
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Test/review of Electronic load ZKE EBD-USB

Electronic load ZKE EBD-USB


Electronic load ZKE EBD-USB+

DSC_4988

Official specifications:

  • Supply power: online USB power supply (5V)
  • Voltage range: 0.05-21.0V
  • Current range: 0.05-4.000A
  • Test mode: constant current discharging, QC2.0/3.0 trigger, MTK-PE trigger, USB current voltage detection
  • Max power: 35W
  • Computer control software: support EB online software test
  • Weight: 66.5g

I bought it from ebay dealer electronics_lee (It was called EBD-USB, but the EB software says it is EBD-USB+)

DSC_4989

DSC_4990

The load is fairly light weight and can be plugged directly into usb outputs.

DSC_4991

The usb connector on this side is output connector when the load is used as usb meter.

DSC_4993

DSC_4992 DSC_4994

The usb micro connector under the “EBD-USB” text must be linked to a computer running the control software.

DSC_4995

DSC_6468



Measurement


  • Will remember settings after a power cycle.
  • Can be used both as a load and as a usb meter.
  • Current consumption from usb when idle is 26mA
  • Current consumption from usb when operating is 200mA
  • Load current draw when off at 20 volt is 0.2mA
  • Load current draw when off at 5 volt is 0.05mA
  • At 20V and 1.75A the current was stable within 0.3%
  • At 8.75V and 4A the current was stable within 0.9%


Electronic%20load%20ZKE%20EBD-USB,%20voltage%20sweep

The load is stable with varying voltage and will automatic limit power to 35 watt.

Electronic%20load%20ZKE%20EBD-USB,%20voltage%20sweep%20min.

Minimum current is 10mA or 0.01A, but it has a 1mA error.

Electronic%20load%20ZKE%20EBD-USB,%20load%20test

No problem running for 1 hour.
With 4A current I got 4003mAh and 33.44Wh in the EB software, this looks reasonable enough. I delivered 3986mAh and 34.87Wh (The Wh is a bit lower than I delivered due to loses in usb cable and connection).

VoltagePrecision

The voltage is fairly precise, here I used a precision meter and measured behind the usb connector, i.e. the same voltage as the load measures. I tried both without the load drawing current and with the load drawing 4A. The result was basically the same, i.e. the load measures voltage very close to the usb connector.

Temp3423

M1: 54,9°C, M2: 52,0°C, M3: 38,9°C, HS1: 58,1°C
When running for full power the load gets warm, but these temperatures do not look that bad.

Temp3425

M1: 52,5°C, M2: 60,6°C, HS1: 67,2°C
The plastic at the bottom hides the hotspots on the circuit board.

Temp3426

M1: 71,3°C, HS1: 127,1°C
But looking from the side shows that the transistor is very hot, this may even be a bit to hot, depending on actual transistor used.

Startup

The load needs some time to adjust to the right current (Voltage changes do not require time to readjust the current).

StartupBug

I found a bug during this test, starting with the load on and zero voltage, it would not adjust the current when I turned voltage on. Instead it draws more than rated current.



Software

This load requires software and it can be a bit difficult to find it. The software looks fairly good and works well.

Screen0.5A

The load can both be used as a load or as a usb meter, it is also possible to do a load sweep.
The software can support more than one load simultaneous, but I have not tried that.

ScreenOverlay

When using it as a meter this overlay shows up, it has a fixed screen position and cannot be moved

ScreenStepTest

The load sweep is done in user specified steps.

ScreenQuickChargeMenuScreenCalibrationMenu

Here is the QuickCharge/Pump express menu and the calibration menu, there are many other menus in the software to adjust the display.

Load%20test%201h%208.75V%204A

Here is my 4A test seen from the software. The jump in voltage is due to me touching the load and the resistance in the usb connector changing. This image was generated by pressing the image button in the software, the size will match the actual size on the screen.

Load%20test%201h%2020V%201.75A%20data

The data can also be saved to disk, in either this format.

DatacsvFormat

Or in a CSV format, but sadly the format do not work everywhere.
The problem is that some programmers assumes that everybody uses . as decimal point, but they ask windows anyway for the decimal point, but not for the delimeter. Either ask windows for both, or hardcode both!

QCtest2

Using the QC menu I played a bit with a QuickCharge V3.0 charger. I first uses the 5V, 9V and 12V selection, then I asked the load to automatic increasing voltage and last to automatic decreasing voltage.
I have used this function a bit more and saw some wrong behavior, but I do not know if it was the load or the device that had the problem. When using the load to measure current and voltage this will not really be a problem.



Conclusion

I am fairly impressed with this small load, it is very good to test usb charges with, but the software has a few minor issues.



Notes

The voltage I measure is usual before the usb cable, but the load measures after the usb cable, i.e. there will be a difference between the software readout and my value, due to drop in usb cable and connection.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

dodge_911
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The ability to run multiple loads at a time is a bit meh, it just adds another Device tab.
So you can only monitor one device at a time. I circumvented this by running two instances of the program and tiling the windows.

:: youtube ::
http://bit.ly/dodgereviewsyt
    :: powerbank capacity tests ::
http://bit.ly/drpbcc
:: μusb cable tests ::
http://bit.ly/drmicrousb
:: lightning cable tests ::
http://bit.ly/drlightning
 :: type-C cable tests ::
http://bit.ly/drtypec

 

L4M4
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Maybe you can just start the program twice and monitor one load on each?

dodge_911
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L4M4 wrote:
Maybe you can just start the program twice and monitor one load on each?

That’s exactly the workaround I’m describing in my previous post Smile
:: youtube ::
http://bit.ly/dodgereviewsyt
    :: powerbank capacity tests ::
http://bit.ly/drpbcc
:: μusb cable tests ::
http://bit.ly/drmicrousb
:: lightning cable tests ::
http://bit.ly/drlightning
 :: type-C cable tests ::
http://bit.ly/drtypec

 

xephon
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Can the sampling rate be adjusted?

dodge_911
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xephon wrote:
Can the sampling rate be adjusted?
I don't think that can be done. I might be wrong though, maybe somewhere deep inside the software.
:: youtube ::
http://bit.ly/dodgereviewsyt
    :: powerbank capacity tests ::
http://bit.ly/drpbcc
:: μusb cable tests ::
http://bit.ly/drmicrousb
:: lightning cable tests ::
http://bit.ly/drlightning
 :: type-C cable tests ::
http://bit.ly/drtypec

 

HKJ
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xephon wrote:
Can the sampling rate be adjusted?

I have not seen any settings to do it.
As can be seen in my logfile examples it is about every other second.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

maukka
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Quote:
When using it as a meter this overlay shows up, it has a fixed screen position and cannot be moved

The meter overlay can be moved by dragging it from the “EBD-USB+” title.

xephon
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I don’t seem to be able to get the software working for more than 1 minute before Windows reports that it has ‘stopped working’. Anyone else has the same problem with 1.8.5?

HKJ
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xephon wrote:
I don’t seem to be able to get the software working for more than 1 minute before Windows reports that it has ‘stopped working’. Anyone else has the same problem with 1.8.5?

What version of windows are you using and have you tried compatibility settings?
I tested on Win7 without any problems.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

xephon
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HKJ wrote:
xephon wrote:
I don’t seem to be able to get the software working for more than 1 minute before Windows reports that it has ‘stopped working’. Anyone else has the same problem with 1.8.5?

What version of windows are you using and have you tried compatibility settings?
I tested on Win7 without any problems.


Both with Windows 7 & 10 machines, with 1.8.5 Build 2016-08-25 & 1.8.5 Build 2016-03-10. Compatibility settings, Admin rights, nothing seems to work. The program will just crash after a minute regardless of whether the tester is connected or not.

Strangely 1.8.0 works fine, but does not work with the EBD-USB+, detects it as an EBD-USB model and cannot increase the current beyond 0.

HKJ
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xephon wrote:
HKJ wrote:
xephon wrote:
I don’t seem to be able to get the software working for more than 1 minute before Windows reports that it has ‘stopped working’. Anyone else has the same problem with 1.8.5?

What version of windows are you using and have you tried compatibility settings?
I tested on Win7 without any problems.


Both with Windows 7 & 10 machines, with 1.8.5 Build 2016-08-25 & 1.8.5 Build 2016-03-10. Compatibility settings, Admin rights, nothing seems to work. The program will just crash after a minute regardless of whether the tester is connected or not.

Strangely 1.8.0 works fine, but does not work with the EBD-USB+, detects it as an EBD-USB model and cannot increase the current beyond 0.

I am running the 2016-03-10 build as it can be seen in my screen dumps and I did not do anything special to get it working, just installed it.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

maukka
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Running the 2016-03-20 build of V1.8.5 on Windows 10. Never had any problems.

dodge_911
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Running v1.8.5 en_0310 on an old WinXP nettop, and as you may have seen, it runs for days…

:: youtube ::
http://bit.ly/dodgereviewsyt
    :: powerbank capacity tests ::
http://bit.ly/drpbcc
:: μusb cable tests ::
http://bit.ly/drmicrousb
:: lightning cable tests ::
http://bit.ly/drlightning
 :: type-C cable tests ::
http://bit.ly/drtypec

 

xephon
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Thanks everyone for the feedback, I finally figured it out after much trial and error.

Turns out turning on the CPU’s Data Execution Prevention causes v1.8.5 to crash after about a minute. Either adding the eb.exe to the exception list or changing it back to the default “essential Windows programs and services” made it work properly.

xephon
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FYI the latest Build 2016-08-25 can be downloaded here. I have no idea what has changed though. The cut off timer for the Single Test does not seem to be working.

http://pan.baidu.com/s/1o8jepAi

dodge_911
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xephon wrote:
FYI the latest Build 2016-08-25 can be downloaded here. I have no idea what has changed though. The cut off timer for the Single Test does not seem to be working.

http://pan.baidu.com/s/1o8jepAi


So better to stay with the older version, then?
:: youtube ::
http://bit.ly/dodgereviewsyt
    :: powerbank capacity tests ::
http://bit.ly/drpbcc
:: μusb cable tests ::
http://bit.ly/drmicrousb
:: lightning cable tests ::
http://bit.ly/drlightning
 :: type-C cable tests ::
http://bit.ly/drtypec

 

tempo
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xephon
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dodge_911 wrote:
xephon wrote:
FYI the latest Build 2016-08-25 can be downloaded here. I have no idea what has changed though. The cut off timer for the Single Test does not seem to be working.

http://pan.baidu.com/s/1o8jepAi


So better to stay with the older version, then?

No idea if it was working previously, haven’t really used the older builds much.
pipifax
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interesting gadget, i got one two:

http://wsq.discuz.com/?siteid=263858267&c=index&a=viewthread&tid=9673

maybe there is three version with display screen at bottom:

http://www.chongdiantou.com/thread-10561-1-1.html

i must say that i am not satisfied with the software. the energy calculations are a bit off, one can easily cross check with Excel. and the 0.5Hz timer isn't regular either, it may be a problem with how the interface protocol has been implemented either in the PC software or in the gadget firmware or it is a deeper problem, originating from the USB-to-Serial driver or us using USB cables for EBD-USB+.

you guys can check with your preferred spreadsheet program: the energy calculated and displayed by the ZKE software is notably incorrect. the capacity is correct, the energy isn't.

if there is interest, i could upload my test run data in *.xlsx sheet form.

maukka
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There’s no discrepancy between the mAh and Wh numbers on mine. I’ll have to check the timer though.

I discharged a couple of power banks at 1A, both were perfectly voltage regulated (no deviation or sag at the end):

#1
3h 26m 12s and the results show 3436 mAh / 17.49 Wh which matches at the indicated and steady 5.09 volts.

#2
4h 12m 56s 4215 mAh / 20.70 Wh at 4.91 volts.

maukka
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Let the meter run for 10 minutes at 1 amp discharge (power bank’s output at 4.907 volts). Matches the stopwatch in my phone. Exported csv file gives me 167 mAh/818 mWh after calculation, software screen reports 167mAh/818mWh. No problems here.

pipifax
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oh okay, thanks. I will do some tests on another computer. the energy discrepancy becomes visible at 40Wh, i.e. discharging a full 4×18650 powerbank.

do you have such data *.csv?

maukka
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I checked some longer logs and you are right, the sampling rate is not 0.5 Hz but shows a drift of 0.76%. That’s why the Wh doesn’t match if you calculate the Wh by assuming that the samples are taken every 2 seconds. I think the software takes this into account and reports correct values. Also the time column in the csv file reflects this. You get matching results if you calculate the Wh column as (amps*voltage*(2/3600)*1.0076).

I’ll try a longer discharge with a higher capacity power bank to see if the timer in the software (and the resulting csv file) is correct.

edit: yes, the software clock and the time column in the csv file are correct, the sampling rate just isn’t exactly 2 seconds

pipifax
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well be it as it may with regard to the inaccuracy of the 0.5Hz timer, there is an actual serious bug in the software regarding energy. it occurs whenever one needs to work with the 'Continue'-button. during a full test run, when the powerbank is almost depleted, there are instances where the user is forced to hit the 'Stop'-button and then the 'Continue'-button, for example the powerbank cannot deliver constant 2amp USB power anymore and therefore shuts down operation. so you would resume the test with a 0.5amp load.

hitting the 'Continue'-button somehow sets the energy back by several Wh's or mWh's, depending on idunno. if you don't pay attention, you will not notice it. i could confirm the existence of the bug on 2 different WinPC's. this bug is the major reason why the reported energy value at the end of a long non-primitive test run looks notably lower than it is in reality.

one cannot trust the reported energy value, if the full test run did include the use of the 'Continue'-button!

 

ADI8421
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Hi all,

I realise this is a bit old, but my findings may be of use to other EBD info searchers.
I have the same energy error readings on one of their latest EBD Mini version M03+
What I’m finding is the energy mw/hr calculations are all based on the intitial battery start voltage only. (Discharge Mode)
My test is with the actual hardware 7-segment display readings only. No PC software being used.
So with a 4 volt battery start voltage and drawing a constant current of 200 ma, the energy reading after one hour is precisely 800 mwh, even though the battery voltage has dropped a fair bit during that test hour.
If the battery voltage had not decreased at all over the test hour, then sure, 800 mwh would be correct, but this is not the case.
Total energy should be less than 800 mwh with a falling battery voltage.
Cheers

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pipifax: that’s true for me too, using the Continue button seems to alter the Wh values, making them incorrect.

I’m using a ZKE EBD-USB+ and software version v1.8.5 (build 2017-06-05).

(latest version is from the official website:

http://www.zketech.com/nd.jsp?id=15#_np=101_304

clicking the “English version download” button leads to download page:

http://pan.baidu.com/s/1nv1CvcX )

Hope they correct this software bug, otherwise, won’t be able to use the Continue button and expect correct readings..

d_t_a
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Any idea if changing the pre-included fan of the ZKE-EBD USB+ would affect the voltage/current readings in the PC software?

I accidentally bumped my EBD-USB+ while it’s running and one of the ‘blades’ of the fan broke off. It’s still functioning, but the fan doesn’t spin well. I’m looking to replace the fan but I doubt I may be able to find one exactly like it (40×40×10mm, 5vDC). I wonder if a slightly higher current 5vDC fan will affect results (the fan is being powered by the micro-USB port that’s connected to the PC and not by the USB power input, right?)

d_t_a
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just a small update, I have replaced the original fan of my EBD-USB+ (I’m very poor at soldering… so it’s not a good job) and it seems to function normally again. I hope the current load measurement is not affected by changing the fan (I got an ADDA fan with the same dimensions and voltage, but the original fan of the EBD-USB+ does not seem to have a current rating labeled on it…)

d_t_a
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Just sharing some stuff I saw elsewhere:

a built-in display for the EBD-USB or EBD-USB+ (so these useful USB load tester/meters can be used while not connected to a PC)

EBD Enhancer Kanade:
http://www.chongdiantou.com/thread-12015-1-1.html

http://www.chongdiantou.com/thread-13267-1-1.html (lots of pictures inside) (so basically it makes the EBD-USB similar to the YZXStudio ZL1100 load tester which has a built-in display)

and someone modded the above so that the display is on the side instead of opposite the fan (which makes it more convenient to use):
http://www.chongdiantou.com/thread-17354-1-1.html (lots of pictures inside)

that modification display for the EBD-USB seems to be called “Kanade”, based on the images (is this related to the “Kotomi Pro” USB meter??), but I can’t seem to find further info about them, so maybe these are just “experimental” products and not really commercially available…

angerdan
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Can you tell the advantage of the EBD-USB over the YZXStudio ZL1100 (or the EBD-USB+ over the YZXStudio ZL1100P) ?

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