Shepherd Scientific Model 770 Precision-AC-DC-OHM Calibrator

[CrazyTiger]

Hi,

Found an interesting instrument on ebay:

https://www.ebay.com/itm/Shepherd-Scientific-Model-770-Precision-AC-DC-Calibrator-Tested-Working-Rare/292954061366?hash=item44356c3a36:g:klMAAOSwT-pcDuI0:rk:35:pf:0&autorefresh=true

From my understanding, this should be sort a Multi-calibrator like Fluke 5500, but there is zero info on the internet. I have communicated with the  seller, he has no manuals, and according to him it was taken out working from a calibration lab hence the "tested" statement.

 Based on the picture I can say it is controlled via SCPI commands via GPIB port. Does anyone here knows about Shepherd Scientific?

My research indicates it used be a medical instrument provider, but the actuall website is dead.

[HalFET]

Never heard of them, but that interface panel looks an awful lot like some of the older Valhalla Scientific calibrators (i.e. this one). Interestingly enough, Valhalla is also located in San Diego: https://valhallascientific.com/about/  So odds are Shepherd Scientific = Valhalla Scientific.

[HighPrecision]

I have a complete system composed by the model 770 AC-DC-OHM Calibrator and the model 120 Transconductance Amplifier for currents to 100A.

These are very old instruments (late 80s), connected to an ancient DOS PC running a M$ GW-BASIC program.