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유니슨음향(주)--Micro
Speakers |
 U1508S3 |
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SPECIFICATION |
| Dimension |
Diameter 15mm / Thickness
3.8mm. |
| Impedance. |
8±10% at 1.0V 1 KHz. |
| Output S.P.L. |
78 dB/W (1m) ± 3 dB at
0.8, 1.0, 1.2, 1.5 KHz. (Average figures). |
| Resonant frequency. |
900 Hz ± 20% at 1.0
V. |
| Effective frequency band. |
Fo ~ 5 KHz. |
| Power. |
Nor. 0.3 W. / Max. 0.4 W. |
| Distortion. |
Less than 5% at 1. KHz 0.3
W. |
| Magnet. |
6.5mm × 1.2mm. (Nd-Fe-B) |
| Flux density. |
4,000 Gauss (SURFACE). |
| Weight. |
1.4g ± 0.2g. |
| Polarity. |
The left hand terminal
should be MINUS(-). |
| Terminal strength. |
1.0 Kg for 30 sec. |
| Operation test. |
Must be normal with program
source 0.3 W. |
| Buzz & rattle, etc. |
Not be audible at 1.55 V,
sine wave, Fo ~ 5 KHz. |
| Load test. |
(White) noise 0.3 W, 96
Hrs. |
| High temperature test. |
+60℃ ± 3 ℃ 96
Hrs. |
| Low temperature test. |
-20℃ ± 3 ℃ 96 Hrs. |
| Operating temp. range. |
High + 60℃ ± 30℃ Low
-20℃ ± 30℃ |
| Humidity test. |
+40℃ ± 3℃ 95% 96 Hrs. |
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| FREQUENCY
CURVE. |
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X : 996.48Hz Y :
81.71dB ZA : Love Curve |
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| Graph, XY Axes A |
Grid : Fine |
X Axis : Log |
| X Range : 2dec |
X Min : 200.0Hz |
Y Axis : dB |
| Y Range : 50.00dB |
Y Max : 90.00dB |
Y Unit : Pa/V |
| dB Ref : 20.0 Pa/V |
Axis Ratio : Standard |
Page 1, Graph |
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| MARKING |
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