Welch Allyn 88460 Optical Colposcope with Swing Arm Roller Stand - User Manual - Manual (Page 15)

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Horizontal Adjustment
Screw (G) controls the horizontal adjustment. Turning the
screw causes the video adapter to move to the left or
the right.
Vertical Adjustment
Slightly loosen screw (H) until the lens barrel (J) is easily
turned by inserting the allen wrench through the hole in
the lens barrel. Rock the wrench up or down to adjust
the vertical setting, then tighten screw (H) again.
Focusing and Adjusting the Multi-
Mag Video Adapter
Often the image sensor of the video camera is not
exactly centered on the C-mount connection, with the
result that, when changing the magnification of the video
adapter, the center of the image may drift a little.
The physician must decide for himself/herself which
magnification he/she will use when making the fine
adjustment of the centers of both the colposcope’s
image and the video image.
Video Adapter with Multiple Magnification
Prefocus the colpsocope by setting the magnification
changer at the middle magnification. Verify that the cir-
cles of the left eyepiece are focused clearly.
Set the video adapter at its highest magnification (this is
very important for greater depth perception at small
magnifications). Loosen screw (K) while keeping the
knurled screw (E) tight. Gently slide screw (K) with the
round plate back and forth until the object clearly seen on
the colposcope also appears clearly focused on the mon-
itor.
In addition to the above method, a clear focus is obtained
on the screen by loosening the knurled screw (E) and
moving the camera assembly in or out to obtain a clear
focus on the monitor. Once desired focus is achieved,
re-tighten the knurled screw (E).
Adjust the colposcope’s fine focus handle to obtain the
greatest clarity on the monitor and compare it with the
image seen through the colposcope. This entire proce-
dure should be repeated several times until both images
are clear, at which point the clamping screw (K) should
be tightened.
Checking the Link Setting of the
Video Camera
Multi-Magnification Video Adapters Only
Perform this procedure only if after following the focus-
ing procedure the image is not in focus at all three mag-
nifications of the video adapter.
It is necessary for an exact link setting of the connection
between the C-mount and the Video camera in order to
obtain a focused image on both the monitor and the col-
poscope at all 3 magnifications of the video adapter. On
most video cameras the link setting is adjustable.
G
J
H
K