Mandy and I made the following plan for getting to frequency stabilization:
I started opening up the ModeRinger model and adding some modifications of the Lock-In to let us track the eigenfrequency. I haven't tested this yet and am a bit unsure which of the built-in simulink blocks I can use, so it might need some modification.
In the meantime, we started down item 1, and noticed that when we drive with 0-150V from the HV driver, the voltage is 0-150V at the other end of the HVBNC. However, if we measure the voltage at the ESD, it has been HP filtered. The leads to the ESD are a twisted pair of manganin wires, and if we untwist them we measure 0-75V at the ESD with a 32.5V offset; some unintended combination of RLC is doing this, as well as maybe a 1/2 voltage divider? We need to measure some transfer functions to figure out exactly what's going on, but yesterday we just called that "enough excitaiton" and confirmed that we can excite with the awggui.