Optical Chopper System
18488-D02 Rev G, September 24, 2012 Page 5 www.thorlabs.com
Part 1. Safety Warnings
Warning Electrical Shock
To avoid electrical shock the power cord protective grounding conductor must be
connected to ground. Refer servicing to qualified personnel.
The unit must be powered off, unplugged from the AC input power source,
and disconnected from all external devices before removing the cover and
replacing the fuse. Failure to do so may cause serious injury to the user since high
voltages exist within the unit.
Thorlabs provides the proper 120 VAC power input cable with each MC2000 for use in the United
States and the appropriate 230 VAC input cable with each MC2000-EC for use in Europe. If using this
unit anywhere else, the user will need to supply a properly grounded power cable to power the unit. If
something should go wrong with the unit, do not attempt to fix. Call a Thorlabs representative and
arrange for repair. The unit should never be opened unless changing the fuse or line voltage as described
in Section 5.
Thorlabs ships all units configured to operate in the United States (i.e. line voltage 115 VAC, 60 Hz and
250 mA fuse installed). It may be necessary to change the line voltage to 230 VAC and replace the fuse
with a 125 mA Slow Blo fuse. Care must be taken when configuring the unit. See Section 5 for complete
details.
Warning Rotating Blade!
Keep hands clear while the blade is spinning. Turn power off before servicing.
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