I am using a 10/100BASE-T Ethernet transformer TG110-E050N5RL (Circuit A in the datasheet) in a circuit. I am applying a 60 Hz 500 Vac hipot across C9 (T1 pin 16 and T1 chassis ground) as shown here: . Pin 14 is open, to simulate a test stand failure. Nothing is connected to T1 pins 9, 10, 11.
I am seeing nothing -- flat, 0 Vdc -- on the corresponding secondary, T1 pins 1 and 2, with a scope during hipot.
My best guess is that core saturating because of the very low frequency of the hipot signal relative to what the transformer was designed for, but I am surprised that I am seeing nothing at all. I have measured the windings' resistances, and the windings do not appear to be damaged.
What, if anything, should I be seeing?