DPA DPA 3530-A Посібник користувача - Сторінка 10

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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.

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.

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.