Author Topic: EEVblog #315 - Korad KA3005P Review/FAIL  (Read 182977 times)

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Offline ProBang2

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #350 on: April 08, 2018, 08:29:33 am »

If I remember correct: That was tried already.
The firmwares of the PSU with and without USB connection are different and the Korad KA xxxx D does not support the interface.
 

Offline chaoticmayhem65

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #351 on: April 08, 2018, 04:39:20 pm »
Well thanks for the link, but unfortunately it still has the problems I was having with the other software. The graphs are way too small and the program won't let you maximize the window to full screen. I've tried v2.5 and the window is physically bigger, along with larger graphs, but the program still wont let you maximize the window to view it in full screen.

I think that I have V2.3 somewhere. I'll let you know if I can find it. Meanwhile you might try these:
http://www.sprut.de/electronic/soft/korad/ka3005p.zip
https://github.com/crapp/labpowerqt/releases/download/v0.1.3/labpowerqt_setup_0.1.3_x86_amd64.exe

So does your version not let you maximize the window as well?
 

Offline HoracioDos

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #352 on: April 08, 2018, 08:55:44 pm »
So does your version not let you maximize the window as well?

I don't remember but you can check it. I sent you a PM with download links.
I hope this could help.
 
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Offline chaoticmayhem65

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #353 on: April 09, 2018, 12:52:14 am »
Why is it that none of these Korad software revisions will let you maximize the window to fullscreen? The voltage and current graphs are absolutely pointless if they are too small to see without the ability to make them bigger. The software would be much more useful if you could just view it in fullscreen just like every other program out there under the sun.........but yet you can't  |O. And why is this software so hard to find? It's not even available on the official Korad website! And to top it off, the software disc that came with my unit was blank  :wtf:. Good thing SRA had software download links posted on their website.
 

Online Mr. Scram

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #354 on: April 09, 2018, 01:05:37 am »
Why is it that none of these Korad software revisions will let you maximize the window to fullscreen? The voltage and current graphs are absolutely pointless if they are too small to see without the ability to make them bigger. The software would be much more useful if you could just view it in fullscreen just like every other program out there under the sun.........but yet you can't  |O. And why is this software so hard to find? It's not even available on the official Korad website! And to top it off, the software disc that came with my unit was blank  :wtf:. Good thing SRA had software download links posted on their website.
Can you post a screenshot? That way we can maybe help.
 

Offline HoracioDos

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #355 on: April 09, 2018, 11:21:48 am »
Hello!

I forgot to mention that you could write your own program to generate graphs without dealing with interface problems if you use sigrok. It's a command line program to control many lab devices. There is a windows version. You can get a text output with a simple script that you could read and plot if you code a little bit. These are some examples for linux.

sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --scan (Scan device)
sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --show (Show device options)
sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --config "voltage_target=3.3" --set (Set output voltage)
sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --config "enabled=on"  --set (Enable output)
sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --continuous (Get countinuous readings)
sigrok-cli  --driver=korad-kaxxxxp:conn=/dev/ttyACM0 --continuous -o readings.log -O csv (Get readlings to a text file)

I hope this can help to think other options if software doesn't meet your spectations.

« Last Edit: April 10, 2018, 10:07:41 pm by HoracioDos »
 

Offline HoracioDos

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #356 on: April 09, 2018, 12:58:12 pm »
Hi
I also forgot to mention. Did you try to maximize the window using a shortcut/keyboard. Windows key + up?
 
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Offline chaoticmayhem65

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #357 on: April 10, 2018, 09:08:19 pm »
Hi
I also forgot to mention. Did you try to maximize the window using a shortcut/keyboard. Windows key + up?

Yes I did. It did nothing. The maximize tab was also greyed out and you could not resize the window whatsoever.

And thank you so much for uploading those different versions of the software for me. They solved my problem. You gave me v2.4 and v2.5. And they both let me view the program fullscreen. I decided to go with v2.5 since v2.4's current graph was not functional. Weird how out of the many versions I tested out, only your two let you view the program full screen. And even stranger yet, your version of v2.5 is somehow different than the version of v2.5 i was using. Yours lets me maximize, mine would not.
 

Offline HoracioDos

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #358 on: April 10, 2018, 10:05:19 pm »
Weird how out of the many versions I tested out, only your two let you view the program full screen.
Perhaps I'm wrong but I guess that Korad gave license to third ones to build and sell their PSUs. May be that's why there are so many software versions and there are small changes in hardware. This issue made me want to play a little bit with sigrok and gnuplot.

Any way, I'm glad that worked and your problem was solved.
 

Offline lt_cdr_data

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #359 on: May 22, 2018, 01:55:09 pm »
Hi, the light blue resistor R3 is blown on my device (mounted on the upper edge of the board, close to the fan connector) could anybody tell me it's value, so i could replace it. TIA
 

Offline wasyoungonce

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EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #360 on: May 24, 2018, 06:50:53 am »
Well blow me down. Show on stargazing on ABC in Australia with Brian Cox, Australian physicist Allan Duffy etc.

They showed a clip of them st radio telescope Parks I think i electronics processing room and ....wait for it...are you ready.... looks to be a Korad PSU on top of station supplying pwr to some station part.

I think it’s the ubiquitous 5 memory version in question here... here’s the money shot:
Hahaha


Sent from my iPhone using Tapatalk
« Last Edit: May 24, 2018, 06:53:10 am by wasyoungonce »
I'd forget my Head if it wasn't screwed on!
 
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Offline Peter63

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #361 on: June 17, 2018, 11:32:53 am »
Hi, the light blue resistor R3 is blown on my device (mounted on the upper edge of the board, close to the fan connector) could anybody tell me it's value, so i could replace it. TIA

I have a Velleman PS3005D 30V 5A  unit.  Have you replace the R3 resistor? Can check R3 resistor in my unit  :-\

Peter
 

Offline helltron

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #362 on: April 03, 2019, 05:22:40 am »
Hey guys, i hope you can help me with an strange issue i have with my KORAD KA3005D. (board label KR1025) It stops showing the current on the lower 7seg in ON mode. I've checked the schematics, measured the voltage at Anode of  D5 and it reflects the current flow in millivolts (e.g. 80 mA gives 80 mV), but the display stays at 0.000 :-(

Maybe the AD input broke, but how can i replace the uC ? It is labeled "KORAD01" but i am pretty shure it is just an Atmega8 or such. Also i would need the firmware to flash a new one.

Any hints?
 

Offline imo

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #363 on: April 03, 2019, 11:21:25 am »
Could we see the schematics?
 

Offline helltron

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #364 on: April 03, 2019, 02:32:52 pm »
Oh, yes, of course :-)
 

Offline imo

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #365 on: April 03, 2019, 06:47:58 pm »
None schematics in your .pdf..
 

Offline helltron

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #366 on: April 04, 2019, 05:09:06 am »
Sorry, here they are.

I also managed to get may device back to function again. A recalibration healed it!
« Last Edit: April 04, 2019, 06:15:29 pm by helltron »
 

Offline lewiss66

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #367 on: April 30, 2019, 05:23:31 am »
Hello, I just received my Korad KA3005P PSU and after some teardown I realized that the USB COM board looks like an old version with no opto couplers:




But on the other hand the pwr board looks rather new:




Any idea if the PSU they sent me is a new model or a mix of old and new?

BTW I checked the control of the PSU with a program software found on the net and it works. The OEM software I got in the CD is in true Chinese...
Though this USB com board doesn't feels like it is a protected one. How can I check if I can trust it? Thanks

A large view of it:

« Last Edit: April 30, 2019, 05:59:32 am by lewiss66 »
 

Offline pete1zed

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Re: EEVblog #315 - Korad KA3005P Review/FAIL
« Reply #368 on: May 16, 2019, 07:14:07 am »
Here is the manual for the dual channel version, marked up with corrections and warnings about bugs in the user interface and behavior:
https://ufile.io/drsjx09j

This applies to models:
 - TENMA 72-10495 (Korad KA3005D-2S):  30V-5A x 2 Channels
 - TENMA 72-10500 (Korad KA3003D-2S):  30V-3A x 2 Channels
and probably also
 - TENMA 72-10505 (Korad KA3003D-3S):  30V-3A x 2 Channels & 5V-3A x 1

Important notes to avoid damage:
●   Do not allow power supply to sink current.  Use diode when charging battery.
●   For sensitive circuits, see Avoiding overshoot and excessive in-rush current :
  ○   Inside the power supply, there is a capacitor near the output terminals for stability.  The current limiting and over current
        protection (OCP) cannot control current from this capacitor. 
  ○   There is some overshoot on turning a channel on.
  ○   There is a spike when turning mains off while the channel is on.
●   In parallel mode, connect load to CH2 (right hand) channel.  (When mains power is turned on, the power supply defaults to
        independent mode, and CH1 to whatever voltage and current settings are in CH1 memory recall M1, with the load turned off.
        Therefore, avoiding CH1 could prevent mistakenly applying wrong settings to the load.)
●   OCP and OVP do not work in serial and parallel modes.
●   If you recall a CH2 memory in SER mode, only CH2 is updated from that memory and only CH2 turns off.  At this time, CH2
        output terminals have up to -1.2 V (i.e. reverse polarity) on them, with a short circuit current of up to -2.8 A. 
       This also happens when the channels are independent but you have wired them in series. 
●      When using the power supply in SER mode, or wired in series, you may have to ensure the supply is working in CV mode to
        avoid instability. 

   
Important notes to avoid confusion:
●   There is a small negative voltage and current when the load is switched off (50mV, 100 uA)
●   OCP/OVP:
  ○   CH2 OUT LED stays on after CH2 OCP/OVP trip disconnects the load.
  ○   OCP and OVP do not work in serial and parallel modes
  ○   CH2 OVP/OCP buttons also control CH1 OVP/OCP
  ○   CH1 OVP/OCP buttons only control CH1 OVP/OCP
  ○   The OCP and OVP LEDs apply to whichever channel last updated them.  Pressing either the OVP or OCP button updates both the
        OVP and OCP LEDs with that single button push.
●      An OCP/OVP trip for one channel does not trip the other channel
« Last Edit: May 16, 2019, 07:16:19 am by pete1zed »
 


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