CCP Free-field Standard Microphone Set GRAS 1/2″ 46AM (3.15-31.5kHz)

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

• The 46AM is a free-field microphone set and as such optimized for all acoustic applications, where the location of the main sound source is known and the microphone can be pointed directly at it ensuring 0° incidence.
• The medium frequency range makes it ideal for general acoustic measurements.
• 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 46AM is a high-performance 1/2” free-field standard microphone set for measuring medium sound pressure levels at a wide range of frequencies. 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 IEC  61094 WS3F standardized GRAS 40AM 1/2” Prepolarized Free-Field Microphone, designed for long-term reliability in multiple environments.
• The prepolarization is obtained through an electret that is inflicted on the microphone back-plate under highly controlled conditions. The electret is then charged to match the specified microphone sensitivity.

Preamplifier

• The preamplifier is the GRAS 26CA 1/2” CCP Standard Preamplifier with BNC connector, 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.