Since this is the volt-nuts forum, I am hoping that someone might have a copy of the O&S manual for a Cohu Model 324 DC Voltage Calibrator.  If not, then the schematics alone would suffice since I got a copy of the manual minus schematics from http://www.ko4bb.com/Manuals/09)_Misc_Test_Equipment/Cohu_324_DC_Voltage_Calibrator_NoSchematics.pdf Thanks, Randy Evans