Ambient Illuminance And Visibility Of Laser Line; Precautions Concerning Brake (For Usa/Can) - Hitachi C 12LSH Technical Data And Service Manual

7-5. Ambient Illuminance and Visibility of Laser Line

The visibility of the laser line on the workpiece changes depending on the brightness of the working environment.
Instruct the customer to consider the brightness of the working environment when using the laser marker referring
to the following table.
Illuminance (lux)
3000 or more
Under direct
Outdoor
sunlight of fine
weather
Ambient
conditions
(reference)
Indoor
Laser line
(The working environment where the illuminance is 200 luxes or less is dark and difficult to operate the Models
C 12LSH and C 12RSH.)
The laser line is invisible under direct sunlight of fine weather. Prepare a shaded area or relocate to a shaded
area to operate the Models C 12LSH and C 12RSH.

7-6. Precautions Concerning Brake (For USA/CAN)

The Models C 12LSH and C 12RSH are equipped with a "brake" that stops running when the switch is turned off.
Normally the operation is stopped in 5 - 6 seconds when the switch is turned off. If it takes 10 seconds or more to
stop, absolutely avoid further use of this machine. In this event, ensure that your customers bring this machine in
their local Hitachi power tools dealer or Hitachi power tools center for servicing.
(1) Be sure to use the carbon brushes dedicated to the Models C 12LSH and C 12RSH (Code No. 999038).
Use of other carbon brushes will adversely affect the brake performance.
(2) If the brake should fail to work, check the carbon brushes. Replace the carbon brushes with new ones if their
length is shorter than 6 mm. If the brake still does not work, replace the armature ass'y.
Table 10 Ambient illuminance and visibility of laser line
3000 or more
Shaded area
in fine weather
Near the
window under
fine weather
Invisible Visible
3000 - 2500 800 - 600
Shaded area
Cloudy
in cloudy
weather
weather
Near the
window under
Indoor under
cloudy
fine weather
weather
Visible Visible
--- 19 ---
300 - 200 150 - 80
Just before
the sunset in
cloudy
weather
Near the window
Indoor under
under cloudy
cloudy
weather, just
weather before the
sunset
Visible
Glaring
30 or less
Ink line is
invisible.
Glaring