1/4" prepolarized condenser microphone (pressure) with buit-in TEDS preamplifier
EM46BD Meggitt Sensing Systems - Measurement Group

The Endevco model EM46BD from Meggitt Sensing Systems is a single unit microphone cartridge and TEDS-enabled preamplifier, offering precision acoustic measurements with stability and plug and play capabilities.

IEEE 1451.4 is an emerging standard for adding plug-and-play capabilities to analogue transducers. The underlying mechanism for plug-and-play identification is the standardization of a Transducer Electronic Data Sheet (TEDS). A TEDS contains the critical information needed by an instrument or measurement system to identify, characterize, interface, and properly use the signal from an analogue sensor. The TEDS resides in embedded memory, typically an EEPROM, within the analogue transducer, as defined in the IEEE 1451.4 standard.

IEEE 1451.4 defines the method of encoding TEDS information for a broad range of sensor types and applications. In order to cover such a broad range while also keeping memory usage to a minimum, the IEEE 1451.4 TEDS concept utilizes the concept of templates that define the specific properties for different sensor types. TEDS is programmed to store the calibration information for the specific combination using IEEE 1451.4 TEDS template number 27: microphone with built-in preamplifier.