## CPD Controller Calibration
**TODO: validate and extend**

This process is not always necessary. Ask the superuser!
1. Set CPD Controller to: 
   - Manual
   - Offset=Gold Work Function
   - Filter off (so you can see what happens immediately)
   - Oscillator to ~2
2. Move the micrometer screw close until a signal appears
3. Set Automatic offset so that the output is 0V