I want to measure and log a relatively high variable voltage signal, with minimum impact on the original signal.
Normally the signal should average 130volts and vary by +/- 20volts at 10Hz. However under different circumstances all these parameters are likely to change.
I would like to log these changes, but the problem is my data logger can only support volatages up to 60v DC or 42v AC.
I have considered using a small transformer, but fear that the relatively slow frequency may not induce a representative current in the secondary coil. And/or the variable frequency may result in back emf, corrupting the original signal.