Optronics 83DS vintage precision CCS

[trobbins]

I am aiming to reconfigure a circa 1985 Optronics 83DS precision current supply, as in common use in optical related labs as a reference lamp supply.  Optronics have no remaining documentation on it, and I can't find any from when this was used.  The internal electrical schematic should be fairly simple to reverse engineer, but I thought I would ask if anyone has anything related to this, or even any later model (83A) ?

The front panel allows a constant current from 1mA to 9.999A to be set, but I don't even know the max voltage range spec yet although it's likely to be up to about 120V.  The only known specs (I think) are +/- 0.05% current accuracy and the same for line/load regulation.  So I may be able to retain its use as a lab precision current supply and see how good it is.

Unfortunately the mains AC is 115V, and it is direct rectified and brute-force cap filtered, so not very elegant.  I could end up running it through a step-down/isolation transformer, but I may be able to feed it from an alternative mains-isolated DC supply, and just live with a restricted output voltage and current span.

[DavidKo]

Try to ask Calcoast in the following list https://www.nhtsa.gov/vehicle-manufacturers/compliance-test-laboratories. They do the photometry testing so it can be that they are using Optronic devices. In Europe the labs often use LMT equipment.

Voltage range should be 30-40V for 24V devices.

[trobbins]

Thanks for that contact detail - I have emailed them  .