We noticed that the HV driver has a 10kOhm input impedance. Currently the TTFSS board has a 15.8kOhm output resistor. The problem is that we only get 10kOhm/(10kOhm + 15.8kOhm) =38% of the PZT range that way. So we will have to change to R46 resistor on D040105 (and remove the passive network C51). We can use a higher resistor in the pomona box to compensate (currently we have a 100kOhm resistor).