Hệ thống micro giảm tiếng ồn GRAS 40HL 1/2'' LEMO

GRAS 40HL 1/2" LEMO Low-noise Microphone System

Part Number: GRAS 40HL

Category: GRAS Sound & Vibration

Status: Available

Freq range: 10 Hz to 16 kHz
Dyn range: 6.5 dB(A) to 110 dB
Sensitivity: 750 mV/Pa

Sale Price: Liên hệ

0903368648

+84903368648

The GRAS 40HL 1/2" Low-noise Microphone System measures sound pressure levels down close to the threshold of human hearing. It is thus generally suitable for sound-power measurements on even very quiet products. Its very wide dynamic range permits measurements down to 6.5 dB re. 20 μPa (in 1/3-octave bands) from 20 Hz to 20 kHz.

Technology

Typical applications and use

Measurements at very low sound pressurelevels
Measurements on hard-disk drives, computerproducts, anechoic rooms, quiet rooms, etc
Sound-power measurements at low levels

Design

The 40HL comprises a special high-sensitive 1/2" free-field measurement microphone and an integrated 1/2" low-noise preamplifier. In combination, they connect to most high-quality input modules with LEMO 1B connector.

It complies with IEC 61672 class 1.

Preamplifier

The preamplifier, a true 1/2" low-noise amplifIer with LEMO 1B connector, has a built-in compensation filter for free-field microphones.

Microphone

The 1/2" microphone is an externally-polarized free field microphone with a specially reduced inherent noise floor in order to achieve a high dynamic range and wide frequency range. Its diaphragm is specially tuned to yield high sensitivity coupled with low internal noise.

TEDS

The preamplifier of the 40HL has TEDS according to IEEE 1451.4. If your measurement platform supports TEDS you can read and write data like properties and calibration data.

Operating 40HL

For holding the microphone, you can order tripods and for level calibration of you need a pistonphone and Calibration Adapter attenuating the pistonphone signal to 94 dB re. 20 µPa. See the tab Ordering info.

Specifications

Frequency range (±1 dB)	Hz	12.5 to 10k
Frequency range (±2 dB)	Hz	10 to 16 k
Frequency range (±3 dB)	Hz	6 to 20k
Dynamic range lower limit (microphone thermal noise)	dB(A)	6.5
Dynamic range upper limit	dB	110
Set sensitivity @ 250 Hz (±2 dB)	mV/Pa	850
Polarization voltage		200 V / Traditional
Power supply		+/- 15V to +/- 60V or 30 – 120V
Power consumption	mA	max. 5.5 mA
Microphone venting		Rear
Output impedance	Ω	47
Temperature range, operation	°C / °F	–20 to 60 / -4 to 140
Temperature range, storage	°C / °F	-40 to 85 / -40 to 185
Temperature coefficient @250 Hz	dB/°C / dB/°F	-0.007 / -0.004
Static pressure coefficient @250 Hz	dB/kPa	-0.01
Humidity range non-condensing	% RH	0 to 95
Humidity coefficient @250 Hz	dB/% RH	0.001
Influence of axial vibration @1 m/s²	dB re 20 µPa	63
TEDS (IEEE 1451.4)		27 v.1.0
Connector type		7-pin LEMO (FGG.1B.307)
CE/RoHS compliant/WEEE registered		Yes / Yes / Yes