stop guiding and set MnMo to 20.00 (you will need to set it in two places, one for each axis).
This obviously doesn't disable guiding, and if there is a spike movement greater than 20 pixels, or the guide star drifts more than 20 pixels during the test then PHD2 will still issue a guide correction.
The easiest way to get the requested data with guiding fully disabled is to just run GA, as Roland suggested earlier in this thread. It also means that he can ruin the DEC backlash test at the same time and grab those screen shots too.