The purpose of this circuit is to apply an external high voltage of up to 1.5 kV to a ring- or disc-shaped piezoelectric ceramic, while retaining the four-terminal measuring method. The circuit is based on Keysight's Impedance Measurement Handbook (chapter: External DC voltage bias protection in 4TP configuration) and offers extended DC bias voltage protection designed for Keysight's E4990A impedance analyser.
Dimensions are 177 mm x 170 mm.
You can find an interactive bom with pcb layout, components and their placements in bom/.
- First prototype, not published
- Add missing components and properties
- Fix capacitor footprints for Vishay - MKP386M510200YT4
- Use over voltage protection diodes with higher power dissipation