Vanguard 1241MM Operation Manuals - page 3
General Operation
Lamp Replacement (Lower Illuminator) [MODEL 1242MM ONLY]
Before attempting to replace or remove the lamp, UNPLUG THE MICROSCOPE FROM ANY POWER SOURCE.
Replace the lamp by gently laying the microscope on its side and opening the trap door located on the bottom
of the base. Loosen the trap door set screw and swing the trap door open. Once the door is open, the lamp can
be removed simply by grasping the lamp and pulling it from its fixture. When replacing, insert the new lamp into the same
fixture. In addition, be careful not to touch the glass lamp envelope when replacing—use a tissue or other medium to
grasp the lamp. This will prevent the oils from your hand from reducing lamp life. Swing the trap door shut and secure with
the trap door set screw. Before using the microscope again, follow steps 1-3 on page 4.
6
1
2
Thank you for purchasing a VanGuard Microscope. With the user in mind, VanGuard Microscopes are built from modern
designs and should provide a lifetime of reliable performance. We recommend you read this entire manual carefully before
beginning to use the instrument.
Assembly
After removing the microscope parts from the protective foam packaging and checking it over for all components and
accessories (see page 7), you can begin assembly.
Place the
stand
on a stable counter top.
Place the
head assembly
on top of the
stand
so that the dovetail flange slides into place. Secure with the knurled
head
set screw
. NOTE: Do not release the head until it is firmly secured with the head set screw.
MODEL 1242MM ONLY
: Attach the upper illuminator power supply to the back of the base. Tighten down with the set
screw.
Attach the
upper illuminator housing
to the trinocular head assembly. Tighten down with the set screw. Plug in the
upper illuminator housing
to the back of the base.
Slide the
eyepieces
into the eyetubes.
After removing the
objectives
from their storage containers, individually install each one into the
nosepiece
by twisting
them clockwise into the threaded holes of the
nosepiece
.
MODEL 1242MM ONLY
: Slide the condenser into the silver condenser mount and secure in place by tightening the set
screw located on the front of the mount. Optionally, you may place the included dispersion (frosted) or blue filter inside
the swing-out filter holder located at the bottom of the condenser.
Upper Illumination
Connect the power cord to a suitable power supply; turn on the
upper illuminator
with the
ON/OFF power switch
located
on the lower left side of the instrument. If light does not come on, check to see that the
variable illumination control
,
located on the lower left side of the instrument, is on the highest setting. Also, try switching the
illuminator toggle switch
located on the lower right side of the stand.
Remove one of the
objectives
from the
nosepiece
. Rotate the
nosepiece
so that the open position is in the light path.
Rotate the
filter wheel
to the “open” (no filter) setting. Verify that the
field iris diaphragm
is fully open. Set the
aperture iris
diaphragm
to roughly an 80% closed position. Verify that the left side (white) polarizer slider is pushed in.
Draw a “+” on a small, white piece of paper and place it onto the
stage
. Position the paper on the
stage
so that the “+” is
in the middle of the round light field. A clear image of the lamp filament should be seen reflecting off the paper. If not,
adjust the
focusing lever
until the image is clear. The lamp filament image should be in the center of the round field and
superimposed over the “+.” If not, rotate the lamp
vertical and horizontal adjustments
until the lamp filament image is
centered. Diffuse the upper light by shifting the
focusing lever
to the right.
Reinstall the
objective
that was removed in Step 2. Turn the
nosepiece
to the 4X
objective
setting. Looking through the
eyepieces
, focus on the “+” on the white piece of paper on the stage. Set the
field iris diaphragm
to about 50% closed.
Close the
aperture iris diaphragm
completely. A small, light field in the middle of a larger, darker field should be seen
through the
eyepieces
. If what is seen resembles Figure 1A, alternately rotate the
aperture iris diaphragm centering
knobs
until the small, light field is centered as in Figure 1B.
1
2
3
4
5
General Operation
6
7
8
1
2
3
4
3