LEMO Pressure Standard Microphone Set GRAS 1/8″ 46DP-1 (6.5-140kHz)

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 application and use

• The 46DP-1 is a pressure microphone set and as such optimized for acoustic measurements of the sound source in a closed coupler or the measurement of sound pressure at a boundary or wall; in which case the microphone forms part of the wall and measures the sound pressure on the wall itself
• The high cut-off frequency makes it ideal for ultra-sonic diagnostics and impulse measurements, where minimum distortion and high resolution are obtained by the small size and fast response of the diaphragm.
• Regarding temperature range, see the Specifications. Should higher temperature limits be required, we recommend considering  the GRAS probe microphones where the microphone and preamplifier can be isolated from the hot source.

Design

• The GRAS 46DP-1 is a high-performance standard microphone set. In our clean-room environment the set is assembled and sealed with a label. However, the microphone set can be dismounted, if you wish to use the components separately.

Microphone

• The microphone cartridge is the high-quality GRAS 40DP 1/8″ Externally Polarized Pressure Microphone, designed for long-term reliability in multiple environments.

Preamplifier

• The preamplifier is the GRAS 26AC-1 Preamplifier which is inclusive TEDS and based on our well-known circuit board substrates. In the industry these are famous for their low self-noise, wide frequency and excellent slew rate performance.

Compatibility

• To perform as specified, the GRAS 46DP-1 microphone set requires a power module or an analyzer input which can supply the preamplifier with power as well as 200 V polarization for the mircorphone.
• The microphone set is terminated with a LEMO 5-pin connector. Ready to use cable assemblies  with LEMO connectors of various types and lengths are available in standard as well as customized lengths.
• The 46DP-1 is IEEE 1451.4 TEDS 27v. 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.

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.