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Vantek CA5015 electronic load, is it crusty? or is it me :)

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lk:
Greetings,

I needed at electronic load, which could handle up to 5 amp and beyond, so building my own would not be worth it. Anyway,

so i bought this http://www.precisegauge.com/index.php?main_page=product_info&cPath=111&products_id=501.

It looked like an ok buy, but what i have noticed is that i quickly get massive voltage drops, at 2 amps drawn my the voltage drops 3-4 volt. even at low current the voltage drop is significant.

and in constant power mode its just silly :) the voltage drops the same way meaning that the while the voltage drops the current increases, which means that the voltage drops further, more current and so on.

What am i trying to say with this? I would suggest not buying this electronic load, as it seems to be rubbish :)

Does anyone else have this electronic load in a version that works? maybe i was just unlucky, i cant return it, i have had it too long without having the need to use it.

-lk

Rerouter:
umm.. not to sound silly but would the massive voltage drops not be due to your moderate impedence voltage supply and wires? as the load itself is meant to apply a load not generate a voltage :?

Balaur:

--- Quote from: lk on March 27, 2013, 07:47:06 am ---It looked like an ok buy, but what i have noticed is that i quickly get massive voltage drops, at 2 amps drawn my the voltage drops 3-4 volt. even at low current the voltage drop is significant.

--- End quote ---

Sorry, but I don't really understand. What you are using as a power source? A lab power supply, a battery? Did you mean that the voltage provided by that source drops by 3-4V when the load is drawing that current? How is this an indication that the electronic load is not functioning correctly?

In constant current mode, are you able to check through (a series) multimeter that the current in the circuit is constant for any voltage input?

The constant power mode is certainly meant to keep the product of the voltage and current constant.

Best regards

lk:
Hi Rerouter, that could be, it would be no surprise that the error/misunderstanding is in my end:) would not be the first time.

But i would still not expect to see a voltage drop over 2-3 volt over a 2 foot cable of 18AWG, 50 mV would make more sense.  The lab powersupply happily stays at the 2 amps, its does not break into sweat.

-lk

Rerouter:
once again hoping to not sound stupid, but could your lab supply possibly have a current limit? or it may have a thermal limit in which case either set it to its maximum voltage or minimum voltage and see what happens,

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