31
BXFM
3-12 Centering the mercury burner
Before performing centering, turn ON the main switch of the
power supply for mercury lamp housing and wait until the
illumination light does not flicker and the brightness becomes
stable.
Insert the shutter until a clicking sound is heard, and engage the
shutter in the light path.
Engage the fluorescence mirror unit other than that with U-excitation
(U-FWUS) in the light path. If your mirror unit is with U-excitation only,
use the fluorescence mirror unit with U-excitation. In this case, be sure
to observe through the antiglare plate.
Do not open the cover on the front of BX3M-URAS-S
during fluorescence observation.
Engage the 10X objective in the light path and place the centering
target U-CST on the stage.
While looking into the eyepiece, bring the cross-line with a double
circle into focus.
Move the stage to coincide the cross-line with the center of the field
of view.
Turn the nosepiece to engage the position not attached with the
objective (remove the objective cap) in the light path.
Pull out the shutter until a clicking sound is heard, and remove the
shutter from the light path.
Move the field diaphragm knob to narrow down the field diaphragm.
BX3M-URAS-S : Position "1"
TIP
1
2
NOTE
3
4
5
6
7
8
The centering of the mercury burner is necessary when U-LH100HG/U-LH100HGAPO is combined with the system.
The mercury burner emits the light by means of discharge produced when a current is supplied across electrodes. If the
electrode position is shifted to cause the light not falling on the sample appropriately due to replacing the burner, etc.,
the observation image becomes dark. In this case, it is necessary to adjust the positions of electrodes of the mercury
burner. This operation to adjust the electrode positions is called the centering of the mercury burner.
Adjust the electrode positions by projecting the light emission across electrodes on the stage (arc image) while looking
at the arc image position.
The mercury burner centering is not required every time before observation, but is recommended after the
burner is replaced or when the observation image seems dark.
TIP
1
8
7
Summary of Contents for BXFM
Page 6: ......
Page 19: ...13 BXFM MEMO ...
