Instruction manual for MH & MH+M
59
The probe constant is a permanent correction factor. It is calculated by the control panel after master
piece measurements, then saved and automatically taken into account during the next
measurements.
The probe constant considers and compensates the main influencing factors such as:
• Diameter of the used ball or disc probe
• Elastic deformation of the probe and its support due to the measuring force
• Hysteresis error of the measurement system
Each time the measurement conditions change, the probe constant has to be
determined again. The main causes of modification are:
• Turning off the instrument
• Probe change
• Probe position modification
• Measurement mode change
In case the measurement sequence does not require the use of the probe constant (for further
details, see this chapter), all values are offseted from the radius of the probe. This is the ST1
mode.
H1 = H2
If probing in two directions is accepted in the same measurement sequence, this is the case in
particular thanks to the compensation of the ball-tip radius in the probing direction. This is the ST2
mode.
Without compensation of the ball-tip, the displayed value in the case below would be H2, although
the required value is H1.
H2 ≠ H1
Schema representing the compensation of the ball-tip:
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