Endevco® model EM46AQ ½-inch TEDS microphone Description IEEE P1451.4 is an emerging standard for adding plug and play capabilities to analog transducers. The underlying mechanism for plug and play identification is the standardization of a Transducer Electronic Data Sheet (TEDS1). TEDS contains the critical information needed by an instrument or measurement system to identify, characterize, interface, and properly use the signal from an analog sensor. The TEDS resides in embedded memory, typically an EEPROM, within the analog transducer, as defined in the IEEE P1451.4 standard. IEEE P1451.4 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 P1451.4 TEDS concept utilizes the concept of templates that define the specific properties for different sensor types. Each Endevco TEDS microphone is a combination of a TEDSenabled preamplifier and a microphone cartridge which is sealed with a sticker. The TEDS is programmed to store the calibration information for the specific combination using IEEE P1451.4 TEDS template number 27: microphone with built-in preamplifier. Model EM46AQ: A combination of ½-inch prepolarized random incidence microphone model EM40AQ and ½-inch Isotron® preamplifier model EM26CA with BNC co-axial connector. For Isotron® transducers, the signal wire is used for reading the TEDS information directly from the preamplifier. Typical features / applications • Single unit comprising microphone cartridge and TEDS1-enabled preamplifier • Stability • Free field • Precision acoustic measurements • Repairable 1 Transducer Electronic Data Sheet - as proposed by IEEE-P1451.4 cmyk

Endevco® model EM46AQ ½-inch TEDS microphone Specifications Frequency response: 3.15 Hz–12.5 kHz: ±2.0 dB 12.5 Hz–8 kHz: ±1.0 dB Nominal sensitivity: 50 mV/Pa Polarization voltage: 0 V Dynamic range: Upper limit (peak): 138 dB re. 20 ìPa Lower limit (thermal noise): 16 dBA re. 20 ìPa Output impedance: Typical: < 50 Ù Power-supply: 2 mA to 20 mA (typically 4 mA) Maximum signal-output voltage (peak): ±8.0 V Temperature: Operation: -30°C to +70°C (-86°F to 158°F) Storage: -40°C to +85°C (-104°F to 185°F) Coefficient (250 Hz): 0.01 dB /°C (–10°C to +50°C) (14°F to 122°F) Relative humidity: Operation:...