Leica OH4, Руководство по обслуживанию, Страница: 181 / 264

Use
39 Leica M525 OH4 / Ref. 10 714 367 / Version -
Adjusting the microscope
Switching on the illumination
➩
Press push-button (1) for illumination.
The illumination comes on and the push-button is lit green.
Leave the main and backup illumination on for at least
5 minutes, as otherwise luminosity will decrease
rapidly.
Adjusting the brightness
Brightness can be increased or decreased using the touch
panel monitor or a handswitch/footswitch or CAN handle.
On the touch panel monitor:
➩
Press the "+"- or "-" key on the brightness adjustment bar for
illumination.
or
➩
Adjust the brightness directly in the bar.
The brightness of the active main illumination changes.
Clicking the "+" or "-" key changes the brightness value
in increments of one. Holding down the mouse button
with your finger changes the value in increments of
five.
The start setting can be saved individually for each
user.
The main illumination can only be switched on and off
using the illumination push-button (on/off) (1).
The brightness setting is also visible when the illumina-
tion is off. However, the display bar will appear darker.
1
On the handswitch/footswitch /CAN handle:
Depending on assignment (see page 48), the brightness of the
main illumination can also be increased or decreased using two
correspondingly assigned keys on the handswitch/footswitch/
CAN handle.
BrightCare™
BrightCare™ is a safety function which automatically limits the
maximum brightness depending on the working distance.
Excessively bright light can, in combination with a short
working distance, cause burns in patients.
Explanation of luminous energy:
The optics of the Leica M525 OH4 surgical microscope have a
variable working distance of between 207 and 470mm. The sys-
tem is designed in such a way that it delivers sufficient light to
produce a bright image even at a long working distance of
470mm.
According to the formula E
v
=I
v
/d
2
, luminous energy increases
constantly to 510% as a function of a reduction in working
distance from 470 to 207mm. (E
v
= light intensity, I
v
= brightness,
d= distance from light source).
This means that less light is required to work with the
microscope at a shorter distance than at a greater distance.
It is advisable to begin with a low light output and increase the
light intensity until an optimum level of illumination is achieved.
With "BrightCare™" the safety function is activated for
all users in the factory default configuration.
Explanation of heat release:
Heat from non-visible light (over 700nm) is filtered out of the
light from the used xenon light source. Nevertheless, white light
always releases heat. An excessive amount of white light can
cause overheating of tissue and metallic objects.
Therefore, it is advisable to begin with a low light intensity and
increase this until an optimum level of illumination is achieved.