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How to clean metal filters or attenuator gratings
Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User's Guide
Alternative Procedure
For these types of optical devices you can often use an ultrasonic bath
with isopropyl alcohol. Only use the ultrasonic bath if you are sure that it
won't cause any damage any part of the device.
1
Put the device into the bath for at least three minutes.
2
Blow away any remaining liquid with compressed air.
If there are any streaks or drying stains on the surface, repeat the cleaning
procedure.
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.
1
Use this procedure when there is greasy dirt on the device:
2
Put the optical device into a bath of isopropyl alcohol, and wait at least
10 minutes.
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.
Cleaning Information
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