Type 40LS

Type 40LS
The High-Precision Surface Microphone Type 40LS is suitable for measurements on airplane surfaces, vehicle surfaces, critical measurements in wind tunnels, as well as general measurements on planar and curved surfaces. It has a wide frequency range reaching up to 70 kHz and a large dynamic range topping at around 164 dB.
Type 40LS is based on high performance measuring microphone technique, which makes the microphone very precise, robust, and reliable. The microphone is an integrated unit consisting of the microphone capsule itself and a CCP1 preamplier including TEDS2 for easy access of identification data and calibration data. The Type 40LS requires a constant-current power supply, e.g. the G.R.A.S. CCP Supply Type 12AL, or any other CCP compatible power supply or input module.
Close manufacturing tolerances together with the advantages of the TEDS chip, provide the Type 40LS with a high degree of interchangeability; a major advantage which excludes accounting for individual characteristics.
The Type 40LS has an integrated 1.5 m co-axial cable with a microdot connector and is delivered with a supple detachable silicon-rubber fairing.
Because of its lightness, the microphone with fairing can readily be mounted on surfaces using double-sided adhesive tape.
Specifications Type 40LS
Specifications Type 40LS
Nominal sensitivity:
1.8 mV/Pa at 250 Hz
Dynamic range (upper limit):
164 dB re. 20μPa (without clipping)
Dynamic range (lower limit):
< 46 dB(A) re. 20μPa (thermal noise)
Frequency response:
10 Hz - 20 kHz (±1 dB)
5 Hz - 70 kHz (±3 dB)
Output connector:
Coaxial Microdot
Temperature Range:
-30 °C to +100 °C
Output impedance:
< 50 ohm
Output cable:
Integrated with coaxial Microdot connector
Cable length: 1.5 m
Cable diameter: 1.1 mm
special: on request
2.5 mm
42 mm (with fairing)
16.2 mm (without fairing)
3 g
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