13
STEINDORFF
®
3.1.6 Centering the mercury burner (Fig.5-7)
◎
Before proceeding to center the burner, wait for the arc
image to stabilize to protect against glare during arc
image centering, it should be viewed across the
excitation light protective shield.
1
．
Switch the light shutter
①
to“●” position to shut off
the light path.
2
．
Revolve the filter block turret to engage the green or
blue excitation filter block into the light path. If U/V
excitation filter block used, be sure to use the
protective shield.
3
．
Revolve the nosepiece to engage 10× objective into
the light path. Place the centering plate on stage,
through transmission observation; adjust the stage
until the cross is in the center of the field of view.
4
．
Remove the objective from the revolving nosepiece
position and engage this position in the light path.
5
．
Pull out the field iris diaphragm lever
②
to close the
iris diaphragm and push in the aperture iris
diaphragm lever
③
to open the iris diaphragm to the
large limit.
6
．
Switch the light shutter
①
to “O” position to open the
light path.
7
．
Turn the collector adjusting knob
④
to project the arc
image on the centering plate and sharpen it.(A)
8
．
Revolve the burner adjusting knob
⑤
to move the arc
image and the mirror reflected arc image in the
symmetrical position.(B)
9
．
Adjust the mirror focusing knob
⑥
(Fig.6) to
sharpen the mirror reflected arc image. (C)
10
．
Turn the burner adjusting knob
⑤
to overlap the arc
image with the mirror reflected arc image. (D)
◎
Turn the collector adjusting knob
④
to make the field
of view as bright as regular as possible.
◎
Maintain this condition until the next time the burner is
replaced.
Fig 6
②
①
Fig 7
⑤
⑦
④
⑥
Fig 5
③
