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Fig. 16. 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 influence on the

frequency response is negligible, the dust will not change the charac-

teristics of the microphone. Therefore cleaning the diaphragm is not

necessary and should not be attempted.

Do not touch

the diaphragm

USE OF ACOUSTIC PRESSURE EQUALISERS

Acoustic Pressure Equalisers 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.

Fig. 17. Correct mounting and dismounting of APEs.

Correct direction for

mounting and dismount-

ing APE's.

The APE must be posi-

tioned so that it is flush

with the diaphragm.

To avoid separation of

the microphone or tight-

ening of the grid, do not

turn the microphone.