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- ADD: UNIT O4, 7/F, BRIGHT WAY TOWER, NO.33 MONG KOK ROAD,KOWLOON, HK
- TEL: 86-18965857227
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- E-mail: alice@easternhonghearing.com
> Audiometer 
High Quality TDH39 DD45 Audiometer Air Transducer Earphone Receiver
- Headset
- speaker
- receiver
- Product description:
Product introduction
Technical Requirements
1. Electrical specifications
|
DC Resistance |
10 Ohm ±1.0 Ohm |
|
Output Power |
1000 mW(100-8000Hz) |
|
Input/output Linear |
1000 mW ±1 dB |
2. Acoustical specifications
|
Sensitivity |
108 ±3 dB SPL @ 1000 Hz @ 1 milliwatt input |
|||
|
Harmonic Distortion |
@ 120 dB SPL at 11 audiometric frequencies up to 8 kHz < 1 % THD |
|||
|
Frequency response: IEC60318-3 |
Tolerance |
|||
|
Freq |
Ideal |
Min |
Max |
|
|
125 |
-0.20 |
-1.20 |
0.80 |
|
|
250 |
-0.10 |
-1.10 |
0.90 |
|
|
500 |
0.55 |
-0.45 |
1.55 |
|
|
750 |
0.45 |
-0.55 |
1.45 |
|
|
1,000 |
0.00 |
0.00 |
0.00 |
|
|
1,500 |
-1.25 |
-2.25 |
-0.25 |
|
|
2,000 |
-0.60 |
-2.35 |
1.15 |
|
|
3,000 |
5.60 |
3.85 |
7.35 |
|
|
4,000 |
-0.40 |
-2.15 |
1.35 |
|
|
6,000 |
3.25 |
1.50 |
5.00 |
|
|
8,000 |
-9.20 |
-10.95 |
-7.45 |
|
3. Testing
The electrical and acoustical properties must be checked before delivery according to the sample plan below:
|
Lot size |
Sample size |
Maximum faults |
|
91 to 150 |
20 |
0 |
|
151 to 280 |
32 |
1 |
|
281 to 500 |
50 |
1 |
|
501 to 1200 |
80 |
2 |
|
1201 to 3200 |
125 |
3 |
|
3201 to 10000 |
200 |
5 |
The full lot must be tested if more than the maximum numbers of faults are found.
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