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The diaphragm is a 2-micron thick metal foil, so any fluid that doesn’t damage stainless
steel can be used. Be very careful during cleaning because the diaphragm is extra fragile
in that situation.
Sometimes you cannot see that the diaphragm is dirty. It is only when connected to the
electrostatic actuator that you can measure that something is disturbing the vibration.
That happens when the mass of the foreign substance is greater than the mass of the
diaphragm.
Before calibrating, always make sure the microphone connector is clean and that no dust
is viewable in the connector of the preamplifier. If you see dust, use dry air to blow it
away.
How to clean a microphone membrane
• Very gently
• Use alcohol and a cotton ball
• After cleaning, wait an hour before calibration
• Use a mix of water and a little dishwater if the microphone is very dirty
How to clean the gold connector
• Use a very soft foam brush
• Use compressed air
Service and Repairs
All repairs are made at G.R.A.S. International Support Center located in Denmark. Our
Support Center is equipped with the newest test equipment and staffed with dedicated
and highly skilled engineers. Upon request, we make cost estimates based on fixed
repair categories.
If a product covered by warranty is sent for service, it is repaired free of charge, unless
the damage is the result of negligent use or other violations of the warranty. All repairs
are delivered with a service report, as well as an updated calibration chart.
WEEE directive:
2002/96/EC
CE marking directive:
93/68/EEC
Manufactured to conform with:
RoHS directive:
2002/95/EC
G.R.A.S. Sound & Vibration continually strives to improve the quality of our products for our customers; therefore, the
specifications and accessories are subject to change.