Hệ thống microphone tạp thấp 1/2'' LEMO GRAS 40HL

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

Part Number: 40HL

Category: GRAS Sound & Vibration

Status: Available

Freq range: 10 Hz to 16 kHz
Dyn range: 6.5 dB(A) to 110 dB
Sensitivity: 850 mV/Pa

Sale Price: Liên hệ

0903368648

+84903368648

1. Typical applications and use

Measurements at very low sound pressure levels

Measurements on hard-disk drives, computer products, anechoic rooms, quiet rooms, etc

Sound-power measurements at low levels

2. Key features

2.1. 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.

Microphone
The 1/2in 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.

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

2.2. 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..

2.3. Vận hành 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.

3. Specifications

Frequency range (±1 dB)	12.5 Hz to 10 kHz
Frequency range (±2 dB)	10 Hz to 16 kHz
Frequency range (±3 dB)	6 Hz to 20 kHz
Dynamic range (from microphone thermal noise)	6.5dB (A) to 110dB
Set sensitivity (250Hz, ±2 dB)	850 mV/Pa
Polarization voltage	200V
Output impedance	47 Ω
Microphone venting	Mặt sau
Working temperature	-20 to 60 °C
Storage temperature	-40 to 85 °C
Temperature coefficient @250 Hz	-0.007 dB/°C
Static pressure coefficient @250 Hz	-0.01 dB/kPa
Humidity range non condensing	0 tới 95 % RH
Humidity coefficient @250 Hz	-0.001 dB/% RH
Influence of axial vibration @1 m/s²	63 dB re 20 µPa
TEDS UTID (IEEE 1451.4)	27 v.1.0
Connector CE/RoHS/WEEE registered	7-pin LEMO (FGG.1B.307) Có/Có/Có