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

Introduction

• Through a close cooperation with our customers, we know that data-safety is highly important because the costs related to unsuited and unreliable sensors may determine whether your project turns into a success or not.
• For our users, data safety translates directly into requests for easier microphone selection, simple system configuration and reduction of measurement errors.
• To meet these requirements, we invented the microphone set concept. It is simple, reliable and robust and consists of a microphone cartridge and preamplifier combination, which is calibrated as one unit. This eliminates errors because there is only one sensitivity value to account for and the risk of contaminating the interface is eliminated. Combine this with our unique and proven design and you have the most reliable measurement microphone sets available in the industry today.

Typical applications and use

• 46BL is ideally suited for production line testing of portable communication devices, such as cell phones, laptop computers, tablets, GPS receivers and similar devices using microspeakers.
• It is also well suited for general acoustic measurements when high sensitivity and low noise are required.
• Regarding temperature range, see the specifications. Should higher temperature limits be required, we recommend the 46BL-HT that can be used up to 120 °C/248 °F, or, if even higher temperatures are required, a GRAS probe microphone, where the microphone and preamplifier can be isolated from the hot source.

Compatibility

• To perform as specified, the GRAS 46BL 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 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 Sound Calibrator.
• For proper sensitivity calibration we recommend using a reference sound source like the GRAS 42AP Intelligent Pistonphone.