Typical applications and use
- Vector-intensity measurements
- Sound-eld mapping
- Sound-source location
- Near-eld investigations
The Type 50VI complies fully with the requirements in IEC 61043, Electroacoustics - Instruments forthe Measurement of Sound Intensity - Measurementswith Pairs of Pressure Sensing Microphones,1993 for Class 1 Sound-intensityprobes and the draft document ISO/DIS 11205.2.
The rst generation of sound intensity probes was designed and developed using available standard microphones and preampliers; resulting in a number of compromises regarding size, acoustical performance and durability. In the new generation of sound-intensity probes, all components have been made specically for sound intensity applications. Each small 1⁄4-inch diameter and 40mm long microphone preamplier is housed in a robust, stainless steel casing which enables novel probe designs. These novel probe designs reduce the disturbances to the sound eld otherwise brought about by the effects of shadows and diffraction, and its symmetry enables reliable calibrations as described in the proposed standard (ISO/DIS 9614-2) for sound power measurements using sound-intensity measurements.
The Vector Intensity Probe Type 50VI includes spacers for 25 mm and 50 mm for covering the frequency range from 80 Hz to 6.3 kHz. The probe handle has an input for 6 preampliers and LEDs for indicating two states as well as a push button for remote control. The remote-controlled output can, for example, be connected to the RS232 port of a computer for controlling the process of data acquisition.
The output of the probe handle is a 24-pin LEMO connector and the 50VI includes a 5 m cable terminating in another 24-pin LEMO connector. This can be connected to a break-out adapter with six standard 7-pin LEMO microphone connectors for connection to three G.R.A.S. Power Modules 12AA.
The G.R.A.S. Vector Intensity Probe Type 50VI is available in two versions:
Type 50VI version 1 is a full 3-dimensional vector intensity probe that includes three pairs of G.R.A.S. 40AI Sound-intensity microphones, three pairs of G.R.A.S. 26AA 1⁄4-inch Preamplifiers, 25 mm and 50 mm spacers, 6-channel probe handle, 5 m cable with LEMO connectors.
Type 50VI version 2 is a 2-dimensional vector intensity probe that includes two pairs of G.R.A.S. 40AI Sound-intensity microphones, two pairs of G.R.A.S. 26AA 1⁄4-inch Preamplifiers, 25 mm and 50 mm spacers, 6-channel probe handle, 5 m cable with LEMO connectors.
|Frequency range (±1 dB)||Hz||TBD|
|Frequency range (±2 dB)||Hz||TBD|
|Frequency range (±3 dB)||Hz||TBD|
|Dynamic range lower limit (microphone thermal noise)||dB(A)||TBD|
|Dynamic range lower limit with G.R.A.S. preamplifier||dB(A)||TBD|
|Dynamic range upper limit||dB||TBD|
|Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply||dB||TBD|
|Dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply||dB||TBD|
|Dynamic range upper limit with G.R.A.S. CCP preamplifier||dB||TBD|
|Open-circuit sensitivity @ 250 Hz (±2 dB)||mV/Pa||TBD|
|Open-circuit sensitivity @ 250 Hz (±2 dB)||dB re 1V/Pa||TBD|
|IEC 61094 designation||TBD|
|Temperature range, operation||°C / °F||TBD / TBD|
|Temperature range, storage||°C / °F||TBD / TBD|
|Temperature coefficient @250 Hz||dB/°C / dB/°F||TBD / TBD|
|Static pressure coefficient @250 Hz||dB/kPa||TBD|
|Humidity range non condensing||% RH||TBD|
|Humidity coefficient @250 Hz||dB/% RH||TBD|
|Influence of magnetic field @80 A/m, 50 Hz||dB re 20 µPa||TBD|
|Influence of axial vibration @1 m/s²||dB re 20 µPa||TBD|
|Connector type||3 m 7-pin LEMO Cable|
|CE/RoHS compliant/WEEE registered||No/No|
|Weight||g / oz||/ TBD|