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Ref Mark, Step and interpolation. You have to set the correct value for having a
correct measurement.
The step defines the grating period of the probe's glass scale. The different
values are defined on the following table :
Type of probe
Specto (ST) 12 or 30
Metro (MT)12XX or 25XX
Metro (MT) 60 or 101
Certo (CT)
The interpolation defines the division rate of the glass scale, and therefore the
measurement precision :
Example for a probe type Heidenhain Specto ST12 :
The glass scale of this probe is engraved with a step of 20µm, therefore if the
interpolation is set at 200, you will have a resolution of 20/200 = 1/10 µm.
5.3.4. TTL probe with Heindehain pinout
The following information are focused on TTL probes (or Magnescale or
Mitutoyo)
Page 38
Step
20 µm
2 µm
10 µm
2 µm
M3
An indicator inside the
probe allow to re-
calibrate by its own at the
half of the measuring
range when this option is
activated
Step, resolution
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