the reason for desiring the AuxCT ratio is to perform a bench calibration of this circuit board. my recent project was to verify PCBs for a turbine control system were operable and ready if replacement was needed. actually the OEM was to perform the work with my observation for the plant.
I specified for them to used 2mA for the bench calibration for this card, since the OEM procedure did not address (nor could find any data about the input auxCT) from many years back, the plant has on file a work order where I performed an inservice loop trim calibration that is approved for use in the event this card is ever replaced.
In addition to the process of getting a planner to add instructions to the routine PM calibration, thne "purchase" the card from inventory, then return it, to perform a PM verification at the plant would require the coordination with the relay/transmittion group (not part of the plant) to provide the test equipment to drive the 5As.
so with the ability to perform the in service loop, the card will be performing proper if installed, I feel i can't justify spending the other resorces just to get the bench calibration a little better
I was just hoping some one reconized the transformers part number