448 8163A/B, 8164A/B, 8166A/B User’s Guide
15 Cleaning Instructions
How to clean metal filters or attenuator gratings
This kind of device is extremely fragile. A misalignment of the grating leads
to inaccurate measurements. Never touch the surface of the metal filter or
attenuator grating. Be very careful when using or cleaning these devices.
Do not use cotton-swabs or soft-tissues, as there is the danger that you
cannot remove the lint and that the device will be destroyed by becoming
mechanically distorted.
Preferred Procedure
Use the following procedure on most occasions.
1 Use compressed air at a distance and with low pressure to remove any
dust or lint.
Procedure for Stubborn Dirt
Do not use an ultrasonic bath as this can damage your device.
Use this procedure particularly when there is greasy dirt on the device:
1 Put the optical device into a bath of isopropyl alcohol, and wait at least
10 minutes.
2 Remove the fluid using compressed air at some distance and with low
pressure. If there are any streaks or drying stains on the surface, repeat
the whole cleaning procedure.
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