Is there a means of measuring the crystal drive level reliably using voltage measurements (even with a differential voltage probe)?
I am attempting to measure the crystal drive strength in order to ensure that it is not exceeding its rated power of 100uW.
Unfortunately, I don't have a current probe capable of measuring this signal.
Is there any other means of measuring the crystal drive level reliably using voltage measurements (even with a low-capacitance differential voltage probe)? Coarse accuracy (say 25%) is fine - if I'm not that far below the max drive strength, I would concerns about the design in any case.
For example, would it be valid to measure the voltage across a small "R_Q" (e.g. 1R) on the below diagram? What pit-falls are there in using a method like this?