ACDC EL-300 Electronic Load info

[OperaHouse]

I purchased a used ACDC EL-300 Electronic Load to do some testing on a converter. I was a little surprised it didn't have a switch to operate in either constant current or voltage. It works, but from my limited testing acts more like a resistor. There is a 10 pin jumper plug in the back that may enable a constant voltage or current function. Anyone have any information on this unit or plug wiring? I've searched the net and haven't found anything.

 

[VEBill]

http://www.ManualsPlus.com

Link to the EL300 manual:

http://tinyurl.com/fcnt3

Details:
Manufacturer: ACDC
Model: EL300
Description: OP-SV
Part Number: MP-31388
Condition: Reprint
Price: $35.00

 

[VEBill]

Brochure with some details and specs:

http://www.valuetronics.com/vt/assets/pdfs/AC-DC_ELSERIES.PDF

 

[OperaHouse]

The problem with manuals is that they are more expensive than the units themselves. I would have thought that someone here was using one of these. An amplified zener that can sink 60+ amps sounds pretty dangerous for most power supply testing, but that is what I need. I have a spare unit that is less than prime that I will cut some traces on and modify for this function. Also need to supply internal 100ma power to hold up the voltage when not connected to a source. Thanks for your efforts.