Hi, I bought the Tenma 72-13210 from CPC, which is a UK division of Farnell, a couple weeks ago. The unit correctly shows 0V with no load or with output shorted. The barcode on the back starts 201909.
Results from esc+power are 01264 V, 05065 A and 0001 G.
I have found a hidden boot menu, but I don't understand what it does: press ESC then power ON with ESC pressed:That is, indeed, the way you enter calibration mode. Calibration didn't solve the problem for me, and the distributor rep told me she tried it on another unit and it made the problem worse. So proceed at own risk. :-) I ended up returning my KEL103 and bought a Rigol DL3021 instead.
Thank you for your feedback with your working unit.
Do you have the 4.1 version of the PC utility (and maybe you can share it)? Thanks you
I have found a hidden boot menu, but I don't understand what it does: press ESC then power ON with ESC pressed:That is, indeed, the way you enter calibration mode. Calibration didn't solve the problem for me, and the distributor rep told me she tried it on another unit and it made the problem worse. So proceed at own risk. :-) I ended up returning my KEL103 and bought a Rigol DL3021 instead.
I am attaching the calibration procedure the US Korad distributor sent me. It is poorly written and confusing -- it is often difficult to tell when they are referring to the KEL103 and when they are referring to the power supply being used. Also, you need a 100V DC power supply with millivolt resolution and a 6-1/2 digit multimeter. The first (3) steps only need 18V, but you can't save the calibration until ALL steps have been completed and step 4 requires 90V.
Thank you for your feedback with your working unit.
Do you have the 4.1 version of the PC utility (and maybe you can share it)? Thanks you
My Korad came with KEL103 assistant v1.2.1 that is not working over the network (because of the broadcast to 255.255.255.255 issue). Could you share your v4.0 software? It is probably much better that this.
Thanks!
Warning: the KEL103 is factory on static IP at 192.168.1.198 ! :palm:
I have changed it with USB connection and assistant in the Tab "USB debugger", then checked "DHCP" on the right, and "OK" to send it.
Then I haved push "Dev Info" to check if DHCP:1
After that, I have checked into my router which IP adress the KEL has.
Who not have a 100v 12a psu? ;D ;D 1200w is not that bad
For the Rigol: are you satisfied with it ?
Mostly. I went with the DL3021A, the 200W model. It was 180% the cost and 100W less power handling compared to the KEL103. Works great, and considerably easier to use due to the display and GUI, has built-in logging to flash drive, communication from python is a bit easier / more reliable since it's full TCPIP (the KEL103 was UDP only). My only big gripe with the DL3021A is that the fan runs constantly, whereas the KEL103 was silent when idle, only turning the fan on when needed.
Hard to beat the KEL103 (or similar Tenma) in "bang for the buck". If my original one (which had very accurate voltage readback) had not failed completely, I'd still be happily using it. But when it failed, the replacement had the voltage offset and error, and the distributor was unable to find one in their stock that didn't have the same problem -- with no new stock expected for several months. So in the end, I opted for a refund and bought the Rigol from TEquipment.
So your original one was a super fast no-drift start at 0.0000V like this review ?Correct.
https://youtu.be/9fe8RnY-Xfw?t=680
Then after the exchange you have same problem than mine which is brand new 1-day old (drift then offset).Correct. The replacement had an offset AND a small additional error that scaled with voltage.
And all your distributor stock have all this problem? :-\ :-\ :-\That's what the rep told me. She attempted calibration on one, and said it made it worse. Opened / tested several, and all of them had the same issue -- some worse than others -- so her conclusion was they had a "bad batch". They didn't expect any more stock for 3+ months, and I didn't want to wait that long, so opted for a refund.
So I have no choice exept return it and get refund.. And effectively the Rigol cost too much for me :-[
def kel103VFix(RawV):
offset=0.0037
factor=0.00015
Corrected = (RawV - offset) - (RawV*factor)
if Corrected < 0:
Corrected=0
return round(Corrected,4)
Do you have the 4.1 version of the PC utility (and maybe you can share it)? Thanks you
My Korad came with KEL103 assistant v1.2.1 that is not working over the network (because of the broadcast to 255.255.255.255 issue). Could you share your v4.0 software? It is probably much better that this.
Thanks!
For me, I'm waiting my RMA to have my refund.
I have found this one that I will buy soon (180W model with the RGB fan :-DD ):
https://fr.aliexpress.com/item/4000478442757.html
It doesn't have a case or so, but it has all the fonction I need, and has a BT connection with .apk and .exe easy to download :-+
I am attaching the calibration procedure the US Korad distributor sent me. It is poorly written and confusing -- it is often difficult to tell when it refers to the KEL103 controls versus when it refers to the power supply controls. Also, you need a 100V DC power supply with millivolt resolution and a 6-1/2 digit multimeter. The first (3) steps only need 18V, but you can't save the calibration until ALL steps have been completed and step 4 requires 90V.
Thank you for your feedback with your working unit.
Do you have the 4.1 version of the PC utility (and maybe you can share it)? Thanks you
My Korad came with KEL103 assistant v1.2.1 that is not working over the network (because of the broadcast to 255.255.255.255 issue). Could you share your v4.0 software? It is probably much better that this.
Thanks!
Can anyone tell me the distance between the binding post centres for this unit? What is the diameter of the posts?