[Test-Equipment] Voltage Calibrator

[Glenn Little WB4UIV]

I have a World Precision Instruments Omnical 2001-D Voltage Calibrator.
An email to the company, which appears to still be in business, has been 
ignored.
Does any one have any documentation on this calibrator?
The circuit is nor real complex, so reverse engineering is an option.

Thanks for any help.

Glenn

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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"