Microphone đầu dò CCP GRAS 40SC

GRAS 40SC CCP Probe Microphone

Part Number: GRAS 40SC

Category: GRAS Sound & Vibration

Status: Available

Freq range: 2 Hz to 8 kHz
Dyn range: 40 dB to 160 dB
Sensitivity: 3 mV/Pa

Sale Price: Liên hệ

0903368648

+84903368648

The CCP Probe Microphone 40SC is a small, constant-current powered, compact unit for sound-pressure measurements in small enclosures, in harsh environments and in very close proximity to sound sources. The high acoustic input impedance at the tip of the probe minimizes its influence on the acoustic field, while the stainless-steel tube of the probe can withstand temperatures of up to 800 ºC.

Technology

Typical applications and use

Acoustic-impedance measurements
Exhaust-system measurements
Near-field measurements
Measurements at high temperatures
Pressure-distribution measurements in small enclosures

Design

The GRAS 40SC is constructed with detachable stainless-steel probes tubes which guide the acoustic signal to a prepolarised microphone inside the housing of the 40SC. After being sensed by the microphone, the acoustic signal is passed on to an impedance-matching wave guide which eliminates unwanted internal reflections. The result is a smooth frequency-response ranging from 2 Hz up to 20 kHz. The internal microphone is connectedto an CCP preamplifier with a high dynamic range; ensuring a measurement range from approximately 40 dB to 160 dB re. 20 μ Pa.

The integrated BNC socket is for drawing power from, and delivering the signal to, a constant-current power supply, e.g. the GRAS 12AL CCP Supply, or any other compatible constant-current power supply.

The CCP Probe Microphone 40SC is internally compensated to equalize the internal pressure of the microphone with the static pressure at the probe’s tip . The static pressure within the 40SC will therefore adjust itself to the static pressure existing at the probe’s tip; which it does with a time constant of approximately 0.1 s.

The 40SC can be used with various probe lengths and is delivered with four standard probe lengths, i.e.: 20 mm, 40 mm, 80 mm and 160 mm. Intermediate lengths can be made by cutting these standard lengths. Also, the stainless steel tubes can be bent to a radius as low as 5 mm without downgrading the system’s acoustics. A flexible probe tube is also provided for use in measurements where stiff stainless-steel tubes are not practical. This does, however, slightly downgrade the system’s acoustic performance.

The right angled design of the 40SC makes it particularly well suited for measurements on exhaust-gas systems and other machinery in general as well as for scanning vibrating surfaces such as loudspeaker diaphragms and cabinets.

The compact size, low weight and all-stainless-steel construction of the 40SC make it robust, easy to handle and easy to mount.

Specifications

Polarization/Connection		0 V / CCP
Frequency range (±3 dB)	Hz	2 to 8 k
Dynamic range lower limit (microphone thermal noise)	dB(A)	40
Dynamic range upper limit	dB	>160
Set sensitivity @ 250 Hz (±3 dB)	mV/Pa	3
Polarization voltage	V	0 V / CCP
Power supply (Constant Current Power)	mA	2 to 20
IEC 61094-4 Compliance		WS3P
Output impedance	Ω	<50
Temperature range, operation	°C / °F	-25 to 700 / -13 to 1292
Temperature range, storage	°C / °F	-40 to 85 / -40 to 185
Temperature range with GRAS preamplifier, operation	°C / °F	-25 to 70 / -13 to 158
Connector type		BNC
CE/RoHS compliant/WEEE registered		Yes/Yes/Yes
Weight	g / oz	40 / 1.4110