We are having a communication problem here.My goal is to measure the on state voltage drop across M1.
If M1 is OFF, the current through the load should be essentially zero.
Your 300K+Zener will however allow 1.7 mA to flow through the load.
How would the capacitor charging affect the Vds(on) and Id measurements of the MOSFET?Sorry! I'm sure I'm being unclear, and I'm not giving you all the details.
Like for example...
The load is potentially capacitive. A little bit of current can trickle charge it. The switch should really be off when the MOSFET is disabled. Even MOSFETs have some small leakage, but it is on the order of microamps in this case.