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Probe measurement range
The measurement range of the probe is dependent on the following parameters:
- Nominal range of the probe
- Mass of the moving structure 50 g (1.94 oz)
- Spring rate of the moving structure 135 g/mm (4.76 oz/mm)
- Mass of the stylus
- Orientation of the probe with respect to gravity
For a vertically orientated probe (e.g. PH10 PLUS at A0°) the effect on the Z-axis measurement range, due to increased stylus mass can be calculated from:
| Stylus mass (g) | |
| Spring rate (g/mm) |
e.g. for a stylus of 40 g mass:
| 40 g (1.76 oz) | = 0.3 mm (0.012 in) |
| 135 g/mm (4.76 oz/mm) |
For a horizontally orientated probe (e.g. PH10 PLUS at A90°) the effect on the Y and Z-axes measurement range, due to the re-orientation through 90° can be calculated from:
| Mass of moving structure (g) + Stylus mass (g) | |
| Spring rate (g/mm) |
e.g. for a stylus of 40 g mass:
| 50 g (1.76 oz) + 40 g (1.41 oz) | = 0.7 mm (0.028 in) |
| 135 g/mm (4.76 oz/mm) |
SP600 probe axes
Typical stylus tip measuring range
The table below gives an example of a typical probe's measuring range (at the stylus tip) for a range of stylus masses and probe orientations.
Stylus mass | Probe orientation | +X | -X | +Y | -Y | +Z | -Z |
|---|---|---|---|---|---|---|---|
4.6 g (0.16 oz) | 0° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.8 mm (0.070 in) | 1.6 mm (0.062 in) |
20 g (0.71 oz) | 0° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 2 mm (0.078 in) | 1.4 mm (0.055 in) |
50 g (1.76 oz) | 0° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 2.2 mm (0.086 in) | 1.2 mm (0.047 in) |
4.6 g (0.16 oz) | 90° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1.2 mm (0.047 in) | 2 mm (0.078 in) | 1.4 mm (0.055 in) | 2 mm (0.078 in) |
20 g (0.71 oz) | 90° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 1 mm (0.039 in) | 2.2 mm (0.086 in) | 1.4 mm (0.055 in) | 2 mm (0.078 in) |
50 g (1.76 oz) | 90° | 1.6 mm (0.062 in) | 1.6 mm (0.062 in) | 0.8 mm (0.031 in) | 2.4 mm (0.094 in) | 1.4 mm (0.055 in) | 2 mm (0.078 in) |