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46AM 1/2" CCP Free-field Standard Microphone Set, Wide Frequency
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46AM 1/2" CCP Free-field Standard Microphone Set, Wide Frequency
The GRAS 46AM is a 1/2" Constant Current Power (CCP) free-field microphone set for measuring medium sound pressure levels at a wide range of frequencies. It is terminated with a BNC connector and is TEDS compatible. The equivalent traditional 200 V LEMO type is GRAS 46AC.
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.
Key Specifications
| Polarization/Connection | 0 V / CCP |
| Frequency range (±1 dB) | 5 Hz to 16 kHz |
| Frequency range (±2 dB) | 3.15 Hz to 31.5 kHz |
| Frequency range (±3 dB) | 3.15 Hz to 40 kHz |
| Dynamic range lower limit with GRAS preamplifier | 25 dB(A) |
| Dynamic range upper limit with GRAS preamplifier | 149 dB |
| Set sensitivity @ 250 Hz (±2 dB) | 14.5 mV/Pa |
| Set sensitivity @ 250 Hz (±2 dB) | - 37 dB re 1V/Pa |
| Output impedance | <50 Ω |
| Output Voltage Swing, min. @ 24-28 V CCP voltage supply | 8 Vp |
| DC bias voltage, typ. | 12 V |
| Microphone venting | Rear |
| IEC 61094-4 Designation | WS2F |
| Temperature range, operation | -30 to 70 °C / -22 to 158 °F |
| Temperature range, storage | - 40 to 85 °C / - 40 to 185 °F |
| Temperature coefficient @250 Hz | -0.01 dB/°C / -0.006 dB/°F |
| Static pressure coefficient @250 Hz | - 0.014 dB/kPa |
| Humidity range non condensing | 0 to 90 % RH |
| Humidity coefficient @250 Hz | - 0.001 dB/% RH |
| Influence of axial vibration @1 m/s² | 66 dB re 20 µPa |
| TEDS (IEEE 1451.4) | 27 v. 1.0 |
| Connector type | BNC |
Specifications from the official GRAS product sheet. Please refer to the attached datasheet for full details.
