GRAS 50GI CCP Intensity Probe

Part Number: GRAS 50GI

Category: GRAS Sound & Vibration

Status: Available

Freq range: Ref. IEC 61043 Class 1
Dyn range: 27 dB(A) to 146
Sensitivity: 12.5 mV/Pa

Sale Price: Liên hệ

0903368648

+84903368648

GRAS 50GI is a sound intensity probe for direct connection to signal analyzers or data acqusition devices with IEPE inputs. The probe includes a pair of phase-matched prepolarized precision microphones which meet the requirements in IEC standard 61043 for a class-1 intensity probe. The small rugged 1/4" CCP preamplifiers ensure minimum disturbances to the sound field for accurate measurements in the full frequency range.

Technology

Typical applications and use

Sound intensity measurements
Sound source location
Sound power measurements
IEC 61043 standard measurements
Sound source ranking
Sound intensity mapping

Design

The probe set includes solid interchangeable spacers for microphone separations from 12 mm to 100 mm so that the probe can cover the frequency range from 50 Hz to 10 kHz.

All components are made specifically for sound intensity applications. Each small 1/4" diameter by 40 mm long microphone preamplifier is housed in a robust stainless steel casing, which enables novel probe designs for reducing disturbances to the soundfield otherwise brought about by the effects of shadows and diffraction, and a symmetry which enables reliable calibrations as described in the proposed standard (ISO/DIS 9614-2) for sound power measurements using sound intensity measurements.

The CCP Intensity Probe GRAS 50GI comprises 40GK sound Intensity Microphone Pair, two 26CB CCP Microphone Preamplifiers, four solid spacers of various lengths, windscreen, and probe handle.

The Type 50GI is delivered in a carrying case as a ready-to-use kit, complete with all the above accessories.

The microphones are 1/2/ free-field prepolarized microphones with a uniquely-designed pressure equalisation system which ensures extremely well defined phase characteristics.

The microphones and preamplifiers are mounted on a swivel head on the telescopic arm of the handle. To cover the full frequency range from 50 Hz to 10 kHz, the 50GI probe is delivered with four solid spacers for spacing the microphones at 12 mm, 25 mm, 50 mm and 100 mm. These spacers can be easily interchanged without dismantling the probe.

Specifications

Item	Specification	Unit
Polarization / Connection	0 V / CCP	–
Frequency range (±2 dB)	Refer to IEC 61043 Type 1	Hz
Lower limit of dynamic range (microphone thermal noise)	27	dB(A)
Upper limit of dynamic range	146	dB
Sensitivity at 250 Hz (±2 dB)	12.5	mV/Pa
Microphone vent	Rear	–
Operating temperature range	5 to 40 / 41 to 104	°C / °F
Temperature coefficient @250 Hz	-0.01	dB/°C / dB/°F
Non-condensing humidity range	0 – 100	% RH
Humidity coefficient @250 Hz	-0.001	dB/% RH
Influence of axial vibration @1 m/s²	66	dB re 20 µPa
Connector type	BNC	–
Compliance	CE / RoHS / WEEE	–
Weight	300 / 10.582	g / oz