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

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)

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)

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)