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docs: describe calibration output

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Add a hint about the connection between the calibration output
and tap threshold.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
This commit is contained in:
Timofey Titovets 2026-01-07 17:16:48 +01:00 • committed by KevinOConnor
parent a03eed7115
commit dfe6d3f066
1 changed files with 25 additions and 1 deletions
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26
docs/Eddy_Probe.md
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@ -24,6 +24,7 @@ named `[probe_eddy_current my_eddy_probe]` then one would run
complete in a few seconds. After it completes, issue a `SAVE_CONFIG`
command to save the results to the printer.cfg and restart.
Eddy current is used as a proximity/distance sensor (similar to a laser ruler).
The second step in calibration is to correlate the sensor readings to
the corresponding Z heights. Home the printer and navigate the
toolhead so that the nozzle is near the center of the bed. Then run a
@ -35,7 +36,17 @@ those steps are complete one can `ACCEPT` the position. The tool will
then move the toolhead so that the sensor is above the point where the
nozzle used to be and run a series of movements to correlate the
sensor to Z positions. This will take a couple of minutes. After the
tool completes, issue a `SAVE_CONFIG` command to save the results to
tool completes it will output the sensor performance data:
```
probe_eddy_current: noise 0.000642mm, MAD_Hz=11.314 in 2525 queries
Total frequency range: 45000.012 Hz
z_offset: 0.250 # noise 0.000200mm, MAD_Hz=11.000
z_offset: 0.530 # noise 0.000300mm, MAD_Hz=12.000
z_offset: 1.010 # noise 0.000400mm, MAD_Hz=14.000
z_offset: 2.010 # noise 0.000600mm, MAD_Hz=12.000
z_offset: 3.010 # noise 0.000700mm, MAD_Hz=9.000
```
issue a `SAVE_CONFIG` command to save the results to
the printer.cfg and restart.
After initial calibration it is a good idea to verify that the
@ -112,6 +123,19 @@ is too close to the bed before the tap.
- Too low - can make the toolhead stop in mid-air
because of the noise.
You can estimate the initial threshold value by analyzing your own
calibration routine output:
```
probe_eddy_current: noise 0.000642mm, MAD_Hz=11.314
...
z_offset: 1.010 # noise 0.000400mm, MAD_Hz=14.000
```
The estimation will be:
```
MAD_Hz * 2
11.314 * 2 = 22.628
```
You can validate the tap precision by measuring the paper thickness
from the initial calibration guide. It is expected to be ~0.1mm.