Model: 2520

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1/4 in free-field, condenser microphone, typical sensitivity = 3.7 mV/Pa. 200 VDC polarization

Externally polarized 1/4 inch free field microphone, 4 mV/Pa, 80 kHz.

  • Nominal Microphone Diameter: 1/4"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±1dB) 6 to 16000 Hz
  • Dynamic Range: >164 dB re 20 µPa

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Nominal Microphone Diameter1/4"1/4" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Open Circuit Sensitivity (±2.4 dB)-48 dB re 1 V/Pa-48 dB re 1 V/Pa[2] 
Open Circuit Sensitivity4 mV/Pa4 mV/Pa[2] 
Frequency Range (±1 dB)6 to 16000 Hz6 to 16000 Hz 
Frequency Range (±2 dB)4 to 80000 Hz4 to 80000 Hz 
Lower Limiting Frequency (-3 dB)0.5 to 3.0 Hz0.5 to 3.0 Hz 
Resonant Frequency (90° Phase Shift)90000 Hz90000 Hz[1] 
Inherent Noise<30 dB(A) re 20 µPa<30 dB(A) re 20 µPa 
Dynamic Range (3% Distortion Limit)>164 dB re 20 µPa>164 dB re 20 µPa 
Standards Designation (IEC 61094-4)WS3FWS3F 
Temperature Range (Operating)-40 to 302 °F-40 to 150 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C))0.004 dB/°F0.01 dB/°C[1] 
Static Pressure Coefficient-0.0073 dB/kPa-0.0073 dB/kPa[1] 
Humidity Coefficient of Sensitivity (0 to 95%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH 
Influence of Axial Vibration (0.1g (1 m/s²))60 dB re 20 µPa60 dB re 20 µPa[1] 
Capacitance (Polarized)6.8 pF6.8 pF[1] 
Polarization Voltage200 V200 V 
Housing MaterialStainless AlloyStainless Alloy 
Mounting Thread (Preamplifier)0.2244 - 60 UNS5.7 mm - 60 UNS 
Mounting Thread (Grid)0.25 - 60 UNS6.35 mm - 60 UNS 
Size - Diameter (with grid)0.276 in7 mm 
Size - Diameter (without grid)0.250 in6.35 mm 
Size - Height (with grid)0.406 in10.3 mm 
Size - Height (without grid)0.361 in9.2 mm 
Weight0.06 oz1.7 gm[1] 

All specifications are at room temperature unless otherwise specified.

Product Notes
[1] Typical.
[2] re 250 Hz
ACS-20Calibration of Precision Condensor Microphones(1)
Optional Versions:
No optional versions
Product Documents None Listed
Additional Downloads None Listed
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones