Products > Test Equipment

Review of the Korad KEL103 programmable load.

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ahope:
Hi,
Here are some snaps from mine.

Hope that helps.

/andreas

rsx90:
Hi guys!

Q11 marked "1AM" is most probably a MMBT3904L NPN transistor: https://www.onsemi.com/pub/Collateral/MMBT3904LT1-D.PDF

From the picture it's clear that the gate drive circuitry of Q13 was affected. You should also check D11, D12, D13, U32 opamp and Q13, there are chances that some of these are be blown too.

As Hydron also asked, what had caused the failure? Wrong polarity connection to a battery?


Best regards,

rsx90

subliti:

--- Quote from: doktor pyta on August 07, 2020, 09:16:27 am ---Can it make battery test (counting Ah) in constant power mode?
I would appreciate if someone could confirm this.

--- End quote ---

No, battery test mode supports only CC. But ofc combined with a pc you can make your own tool that counts AH in any mode.

Also here some clarification about the unit/manual:
The manual is garbage. For example...in battery test mode you have to specify (even if you dont need it) a max discharge time limit and consumed AH limit. The manual states that this is in seconds (discharge time) but this is wrong. You can set the max time to 9999, but this is minutes and not seconds.  The same with AH, its 9999 AH.
The manual is also wrong/confusing with different other things.

ahope:
I have blown up my KEL103. 12V Lead Acid batteries should not be connected the wrong way.

I have replaced one of the 5W resistors on the input.

Now U8, a 7812 +12V regulator goes burning hot and nothing works. Looking closely on the pcb I see C135, C136 and C 137 are burned up (?).

Anyone know their value? If you have a KEL103, can you measure them?

ercapoccia:
Did you check for shorts? I'm not familiar with this device, but for sure there is a short somewhere.

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