PR-680/680L User Manual
26
U
SING AN
O
BJECTIVE
L
ENSES
Aligning and focusing the Optical System
1.
If using the MS-75, make sure the target is out of focus by defocusing the lens. If using a fixed
focus lens, such as the MS-2.5X, move either the target or instrument until the target is out of
focus.
2.
Turn the diopter adjustment on the eyepiece until the measuring aperture (black spot in the
center of the field of view) is in sharp focus. If the entire aperture does not focus
simultaneously, make sure the
top
and
bottom
of the aperture are in focus.
3.
Focus on the target. If using the MS-75 lens, rotate the lens focusing ring until the target is in
focus. If using a fixed focus lens, move either the instrument or the target until sharp focus is
achieved.
Do not use the eyepiece diopter adjustment to focus on the target.
FIGURE 68 - PR-680/680L / PR-680/680L FOCUSING
4.
Make sure the measuring aperture falls within the lit area of the target. Failure to adhere to this
step will result in erroneous readings. If possible, or unless otherwise specified, we recommend
that the diameter of the aperture cover 50% to 80% of the smallest dimension of the object (e.g.
character ‘1’ in
Correct
Incorrect
FIGURE 69 - APERTURE ALIGNMENT
5.
From the
Instrument Setup
menu, touch the
▲
▼
icons adjacent to
Primary Accessory
until the
installed lens appears.
6.
Make any other changes in the
Setup
menu such as
Sensitivity, Speed, Average
etc.
7.
Touch the
MEASURE button
to begin a measurement.
Diopter
adjustment
Objective Lens