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Fig. 13. Be careful to avoid any contact with the diaphragm.
When changing grids, be very careful to avoid any contact with the
diaphragm. Over time a visible dust layer can build up on the
diaphragm. Since the mass added is extremely small and the influ-
ence on the frequency response is negligible, the dust will not
change the characteristics of the microphone. Therefore cleaning
the diaphragm is not necessary and should not be attempted.
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Do not thouch
the diaphragm
USE OF ACOUSTIC PRESSURE EQUALIZERS
Acoustic Pressure Equalizers are only to be used with the standard
silver protection grid DD0251.
Do not try to fit APEs on Nose Cone UA0777.
The microphone must be inserted into the APE from the hole oppo-
site to the O-ring. Push the microphone through the hole gently;
apply a small amount of force when the microphone passes the O-
ring and is locked. Never turn the microphone or the APE, since this
may cause a tightening or loosening of the grid. When positioned
correctly, the APE is flush with the diaphragm.
During insertion of the microphone do not place a finger or a palm
across the hole, as air confined in the hole may cause the
diaphragm to crack.
When dismounting the APE, use a thumb to press it off. Never turn
the microphone or the APE.
1
2
3
Fig. 14. Correct mounting and dismounting of APEs.
1. Correct direction for
mounting and dismount
ing APE's.
2. The APE must be posi-
tioned so that it is flush
with the diaphragm.
3. To avoid separation of
the microphone or tight
ening of the grid, do not
turn the microphone.
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