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46AD 1/2" CCP Pressure Standard Microphone Set, High Sensitivity
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46AD 1/2" CCP Pressure Standard Microphone Set, High Sensitivity
The GRAS 46AD is a 1/2" Constant Current Power (CCP) pressure microphone set for measuring medium sound pressure levels at medium frequencies. It is terminated with a BNC connector and is TEDS compatible. The equivalent traditional 200 V (LEMO) type is GRAS 46AP.
The 46AD 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 medium frequency range makes it ideal for general acoustic diagnostics.
Key Specifications
| Polarization/Connection | 0 V / CCP |
| Frequency range (±1 dB) | 12.5 Hz to 7.5 kHz |
| Frequency range (±2 dB) | 3.15 Hz to 10 kHz |
| Dynamic range lower limit with GRAS preamplifier | 18 dB(A) |
| Dynamic range upper limit with GRAS preamplifier | 138 dB |
| Set sensitivity @ 250 Hz (±2 dB) | 50 mV/Pa |
| Set sensitivity @ 250 Hz (±2 dB) | -26 dB re 1V/Pa |
| Output impedance | <50 Ω |
| Output Voltage Swing, min. @ 24-28 V CCP voltage supply | 8 Vp |
| Power supply min. to max. | 2 to 20 mA |
| Power supply min. to max. (single/balanced) | N/A V |
| DC bias voltage, typ. | 12 V |
| Microphone venting | Rear (Front on request) |
| IEC 61094-4 Designation | WS2P |
| Temperature range, operation | -30 to 85 °C / -22 to 185 °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 | -0.01 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 | 62 dB re 20 µPa |
| TEDS (IEEE 1451.4) | 27 v. 1.0 |
| Connector type | BNC |
| Weight | 33 g / 1.164 oz |
Specifications from the official GRAS product sheet. Please refer to the attached datasheet for full details.
