Optical Chopper System
18488-D02 Rev G, September 24, 2012 Page 19 www.thorlabs.com
Part 7. Maintenance and Troubleshooting
7.1. Cleaning
The MC2000 should only be cleaned with a soft cloth and mild soap detergent or isopropyl alcohol. Do
not use a solvent-based cleaner.
The optical chopper wheel may build up a layer of dust over time on the leading edges of the wheel. To
clean the wheel, remove it from the optical head and wipe it clean with a cloth dampened in isopropyl
alcohol. To help prevent the chopper wheel from rusting in high humidity environments, wipe the blade
with a clean rag sprayed with a light lubricating rust inhibitor (e.g. WD40 or similar).
7.2. Diagnostic Messages
When the MC2000 senses a problem with the chopper operation, it will display various messages to help
identify the source of the problem.
• Freq. Not Locked This indicates that the chopper speed could not lock to the set frequency or the
external reference. If this occurs, check the unit has been set to the correct
blade (as indicated on power up). If this problem persists, contact Thorlabs for
assistance.
• Phase Not Locked This indicates that the chopper phase could not lock to the set phase setting. If
this problem persists, contact Thorlabs for assistance.
• No Int. Reference This message is displayed when the unit is set to external reference but it does
not detect an external reference input. Check that your external reference
source is connected to the BNC labeled EXT REF IN.
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