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Inside the new Korad KA3305P linear PSU

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pascal_sweden:
I was looking at the Korad website, and they seem to have many different versions.

http://koradtechnology.com/en/Products.html

What is the difference between the KD series (Encoder-controlled and Digital Control DC Power Supply) and the KA series (Digital Control DC Power Supply)?

I am not refering to the D extension (non-programmable) and the P extension (programmable),
but really to the first two characters in the model names: KD or KA.

SantaClaw:
http://www.ebay.com/itm/KORAD-KA3005P-Programmable-Precision-Variable-Adjustable-30V-5A-DC-Linear-Po-/111455671404?hash=item19f346946c

http://www.ebay.com/itm/KORAD-KD3005P-Programmable-Precision-Variable-Adjustable-30V-5A-DC-Linear-Po-/131367286456?hash=item1e9619b6b8

Easier to compare ^^

Looks like it's missing the memory features, and it's got a completely different interface just two encoder wheels in stead of encoder wheel + buttons. Otherwise the specs look identical.

The KA series looks to be a bit more expensive.


User manual: http://www.sra-shops.com/docs/srasolder/instructions/ka3305_user_manual.pdf


I assume it handles 240v ? it says 220/230v, but that's usually +-10% right?

Ok, SRA-Shops comfirmed it. It works fine on 240v 50hz :)

icpart:
Very interesting power supply,
Seems is there also new modification of that PSU with remote sense option. You can see here on picture from Korad website:

Also from description:

--- Code: --- The remote measurement terminal compensates the voltage drop of the wire
--- End code ---
Just look of these interesting new added screw terminals on back. 
Also there is modification of that PSU without binding posts maybe from Reichelt Germany :-//:

Also there is rebranded version under TENMA from Farnell under model number 72-2645:
http://uk.farnell.com/tenma/72-2645/power-supply-bench-0-30v-5v/dp/2478801
But on Farnell website I can't see any screw terminals on back for remote sensing from pictures. But from description in datasheet of 72-645:

--- Code: ---Complete digital control / programmable
• 10mV / 1mA resolution
• Low noise and ripple
• CV / CC constant voltage and constant current modes
• 5 sets of parameters can be stored and recalled
• 100 sets of stored parameters inside for programmable recall
• The remote measurement terminal compensates the voltage drop of the wire
• Industrial grade, with load for a long time
• Interfaces USB and RS232
--- End code ---

Also i tried to find any user manual of that new models but without success.

torch:
I think I read somewhere that those recessed terminals are a European safety requirement. So you can't fry yourself if you accidentally come in contact with 30VDC. Perhaps the screw terminals on the rear are duplicates of the front panel outputs to make up for the lack of screw posts on the front?

robert_:

--- Quote from: torch on December 03, 2015, 11:30:13 pm ---I think I read somewhere that those recessed terminals are a European safety requirement. So you can't fry yourself if you accidentally come in contact with 30VDC. Perhaps the screw terminals on the rear are duplicates of the front panel outputs to make up for the lack of screw posts on the front?

--- End quote ---
Its mostly to keep people from removing the shrouds from their test leads to fit the old-style connectors, and afterwards, have unsafe test leads. From practical experience, that happens all too often.
Actually i fit the safety terminals on everything i build, as i do lots of "high"voltage stuff and therefore, use insulated 4mm test leads almost exclusively. I dont remember having ever neded to directly connect bare wires to any piece of equipment (i DO understand the need to do so for highest precision measurements).
There are these extremely useful little things, quick connect 4mm plugs. Much easier to use, safe and easy to connect/disconnect...

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