Polytec PDV-100, Руководство пользователя

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4-5
4 Making Measurements
4.3.2 Stand-off Distances
The stand-off distance is measured from the front edge of the retaining ring
for the front lens (refer to
SECTION
7.2.5). The optimal stand-off distances can
be ascertained as follows:
Equation 4.1
i.e. for l = 138 mm the optimal stand-off distances are:
96 mm, 234 mm, 372 mm, 510 mm, etc (refer to
SECTION
7.2.3 and
SECTION
7.2.4).
n 0; 1; 2; ...
l 138 mm