50/60 Hz Decade detail
The actual "box" carries out a number of functions
Main function, a LF high voltage ratio decade to facilitate
full calibration of 50/60 Hz syncro/resolver test sets.
Switchable source/ nulling bridge capability.
Built in self test (against the Tegam 1011 at low voltage)
60 degree/45 degree sector switching for quick/easy
calibration of API,s etc