How to calibrate z offset?

what is the right procedure to calibrate z offset?

I did find probe_calibrate

but after runnning it safe a new z_offset to eddy sensor and that change produce an error “invalid eddy height”

for me it looks like successful this procedure Eddy Current Inductive probe - Klipper documentation

  1. home all
  2. LDC_CALIBRATE_DRIVE_CURRENT CHIP=eddy
  3. save_config
  4. home all
  5. PROBE_EDDY_CURRENT_CALIBRATE CHIP=eddy
  6. paper test
  7. ACCEPT
  8. save_config