CCP Pressure Standard Microphone Set GRAS 1/4″ 46BL-FV (4-20kHz)

Introduction

• 46BL-FV is ideally suited for production line testing of portable communication devices, such as cell phones, laptop computers, tablets, GPS receivers and similar devices using micro speakers.
• It is also well suited for general acoustic measurements when high sensitivity and low noise are required.

Compatibility

• To perform as specified, the GRAS 46BL-FV microphone set requires a constant current input module that can deliver 4 mA and 24 V unloaded CCP voltage supply. If the constant current supply is lower, the capability of driving long cables is reduced and consequently, the upper frequency is reduced. If the voltage supply is lower, it will influence the upper dynamic range.
• The microphone set is terminated with a 10/32 Microdot female connector. Ready-to-use coax cable assemblies of various types and lengths are available in standard as well as customized lengths.
• The 46BL-FV is IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets, you will be able to read and write data like properties and calibration data.

Calibration

• 46BL has a diaphragm that is slightly larger in diameter than is standard for 1/4″ microphones. This does not affect sensitivity calibration, but for frequency calibration, you need a RA0236 Adapter.

System verification

• The functionality of TEDS is very useful to determine which microphone is connected to which input channel. However, it is not a check of whether the microphone is within specifications or not. For daily verification and check of your measurement setup, we, therefore, recommend using a sound source like the GRAS 42AG Multifunction Sound Calibrator.
• For proper sensitivity calibration, we recommend using a reference sound source like the GRAS 42AP Intelligent Pistonphone.

Calibration

• When leaving the factory, all GRAS microphones have been calibrated in a controlled laboratory environment using traceable calibration equipment. Depending on the use, measurement environment and internal quality control programs we recommend that the microphone is recalibrated at least once a year.
• We offer two kinds of calibration as an optional after-sales service: GRAS Traceable Calibration and GRAS Accredited Calibration.
• GRAS Traceable Calibration is a traceable calibration performed by trained personnel under controlled conditions according to established procedures and standards. This is identical to the rigorous calibration that all GRAS microphones are subjected to as an integral part of our quality assurance.
• GRAS Accredited Calibration is performed by the GRAS Accredited Calibration Laboratory that has been accredited in accordance with ISO 17025 by DANAK, the Danish Accreditation Fund.
• If you want a new microphone set delivered with an accredited calibration instead of the default factory calibration, specify this when ordering.
• Learn more at gras/calib.