RTI Tech
MODEL 1140 PERFORMANCE SPECIFICATION
New subminiature condenser microphone
for professional applications. The extended frequency response and low frequency
attenuation are especially suitable for use with modern hearing aids. Transducers
represent the state of the art in resistance to shock and vibration and in acoustic
performance. A novel electret element and integral preamplifier are included
Noise level
(ŤAť-weighted)
(1 kHz equivalent SPL) |
28 dB Max |
| Supply voltage |
1.3 V (.9–20 V) |
| Sensitivity change at .9 V |
3 dB Max |
| Current drain at 1.3 V |
50 ľA Max |
| Output impedance |
3 kOhm (2–5 kOhm) |
Sensitivity (dBV) |
| Frequency |
min |
nom |
max |
 |
| 100 Hz |
|
-67.0 |
|
| 1000 Hz |
-63.0 |
- 60.0 |
-57.0 |
| ~4500 Hz |
|
-55.5 |
|
|
Device conformity range of deviation from 1 kHz |
|
| 100 Hz |
-11 dB |
to |
-4 dB |
| 1000 Hz |
0 dB |
|
0 dB |
| ~4500 Hz |
+1.5 dB |
to |
+7.5 dB |
|
| Patented under US
4,764,690 and others pending |
|
|
 |
DIMENSIONS IN MM
(INCHES) |
|
