Hi! I am modding my TL-21, and ran into some issues. I've tried attaching kelvin clips with short (15cm) and thick (16AWG) wires directly to the little PCB inside the TL-21.
Nothing is shielded. The system calibrates OK, but touching the wires or clips while measuring adds from 5 to 10 pF to the measurement.
Does shielding solve this problem? Also, does the shield need to be grounded to work, or does it provide a benefit even without grounding?
In other words, should I replace the thick unshielded wires with thinner, but shielded wires?
Thank you!