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1.SCOPE   范圍

This specification shall be applied to electret condenser microphone(ECM)
本規格說明書適用于駐極體傳聲器

2.MODEL NO. 產品型號

H9745W005A-56DB

3.ELECTRICAL CHARACTERISTICS  電氣特性

Temp. 環境溫度

20 ± 2℃

Room Humidity 相對濕度

65 ± 5﹪

4.MEASUREMENT CIRCUIT  測試電路 

5. TYPICAL FREQUENCY RESPONSE CURVE (FAR FIELD)  頻響曲線
    Far Field Measurement Condition  自由場測試條件
    Temperature 溫度 ：  20   ± 2 ℃
    Bias Voltage 基準電壓：  3.0V (with 2.2K Ω series resistor 2.2KΩ電阻)
    Acoustic stimulus :1Pa (94Db SPL at 1 KHZ ) at 50cm from the loud-speaker.
    聲音條件：The loud-speaker must be calibrated to make a flat frequency response input signal
    距離揚聲器50cm出產生1Pa聲壓。 揚聲器必須先用標準輸入信號事先校準。
    Position: The frequency response of microphone unit measured at 50cm from the loud-speaker
    位置 ：   揚聲器距離待測話筒50cm. 

6.DIMENSIONAL DRAWING  外形圖

7.RELIABILITY TEST  可靠性測試

7.1 VIBRATION TEST 振動測試
    

To be no interference in operation after vibrations. 10Hz to 50Hz for 1 minrte full amplitude 1.52mm , for 2 hours at three axises
  1分鐘頻率變化從10Hz到50Hz，振幅在1.52mm，在三個方向測試振動2小時，產品應不受影響

7.2 DROP TEST   跌落測試

To be no interference in operation after dropped to concrete floor each one time from 1meterheight at three directions in state of packing
以正規包裝的三個方向從1米高處自由落到混凝土地面時，產品應不受影響

7.3 TEMPERATURE TEST   溫度測試   

-After exposure at 60℃ for 72 hours ,sensitivity to be within ±3dB from initial sensitivity
在60℃環境中維持72小時，靈敏度偏離范圍在±3dB.
(The measurement to be done after 2 hours of conditioning at room temperature 測試在室內溫度下放2小時后進行）
-After exposure at -20 ℃ for 72hours,sensitivity to be within ±3dB from initial sensitivity
在-20 ℃環境中維持72小時，靈敏度偏離范圍在±3dB.
(The measurement to be done after 2 hours of conditioning at room temperature測試在室內溫度下放2小時后進行）

7.4 HUMIDITY TEST   濕度測試       

After exposure at 40℃ and 90 to 95﹪ relative humidity for 72 hours ,sensitivity to be within ±3dB from initial sensitivity
   在40℃溫度和90-95﹪相對濕度的環境下持續72小時，靈敏度偏離范圍在±3dB.

7.5 TEMPERATURECYCLE TEST 溫度交變測試       

After exposure at -20℃ for 30 minutes,at 20℃for 10 minutes,at 60℃ for 30minutes, at 20℃ for 10 minrtes.5 cycles ,sensitivity to be within ±3dB from initial sensitivity
  在-20℃下持續30分鐘，在20℃下持續10分鐘，在60℃時持續30分鐘，在20℃時持續10分鐘，以上過程循環5次，靈敏度偏離范圍在±3dB.
 (The measurement to be done after 2 hours of conditioning at room temperature 測試在室內溫度下放2小時后進行）

7.6 TEMPERATURE SHOCK   溫度沖擊

Temperature change from -20℃ to 60℃ for 30 minures. (changing time :20 sec)After 32 cycles,sensitivity to be within ±3dB from initial sensitivity
在20秒內溫度從-00℃變化到60℃,持續30分鐘, 靈敏度偏離范圍在±3dB.
 (The measurement to be done after 2 hours of conditioning at room temperature測試在室內溫度下放2小時后進行)

8 TEMPERATURE CONDITIONS  溫度條件

8.1 STORAGE TEMPERATURE  貯存溫度：

-25℃ ～ +65℃

8.2 OPERATING TEMPERATURE  操作溫度：

-20℃ ～ +60℃

9.MEASUREMENT SYSTEM  測量系統

10.REGARDING THE SOLDERING OPERATION  焊接注意事項
Every ECM contains a FET with microphone boby.This FET is easy to damageable from excessive heat and electrical shock.Proper attention for the soldering work is required same as followings.
每個ECM都包含有個FET.FET在過熱和電流沖擊下容易損壞。應遵循以下焊接操作規程：

1 -Recommend to use 15W ～ 30W ceramic soldering iron and apply 330±20℃temperature range
推薦使用功率在15W-30W，溫度變化范圍在330±20℃的陶瓷電烙鐵。

2 -Soldering should be accomplished within 2 seconds at each terminal so as not to be overheated.
為防止過熱，焊接應在2秒內完成。

3 -ECM shall be soldered fixed on the metal block(heat sink)which has the higher radiation effects. Heat sink shall contact with each of ECM.
應把駐極體傳聲器固定在散熱良好的金屬裝置（散熱板）上進行焊接.

4 -The pin hole soldering shall be avoided.
焊接后，各焊點不應出現砂眼（焊錫小孔）現象.

5 -E.C.M may easily destroyed by the static electricity,and the countermeasure for eliminating the static electricity(the ground for soldering copper,for worktable and for human body)shall be executed.
駐極體傳聲器容易受靜電破壞，應采取防靜電措施（焊接器具，工作臺，操作人員人體應接地）

No.
序號

Part name
部件名稱

Materials Type
材料型號

Qty
數量

Origin
產地

Manufacture
協力廠商

Remarks
備注

1

P.C.B

Carton

1

China

Suzhou

2

Plastic Ring

ABS

1

China

Changshu

3

FET

2SK596

1

China

Beijing

4

Back  plate

Copper blank

1

China

Changshu

5

Spacer

Mylar

1

China

Hebei

6

Diaphragm

FEP

1

USA

Dupont

7

FELT

Fabric cloth

1

China

Dongguan

8

Case

AL

1

China

Shanghai