Model: 2540

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1/2 in free field, condenser microphone, typical sensitivity = 14 mV/Pa. 200 VDC polarization

Externally polarized 1/2 inch free-field microphone, 14.5 mV/Pa, 40 kHz.

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±1dB) 5 to 16000 Hz (5 to 16000 Hz)
  • Dynamic Range: >160 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Open Circuit Sensitivity (±1.2 dB)-36.8 dB re 1 V/Pa-36.8 dB re 1 V/Pa[2] 
Open Circuit Sensitivity14.5 mV/Pa14.5 mV/Pa[2] 
Frequency Range (±1 dB)5 to 16000 Hz5 to 16000 Hz 
Frequency Range (±2 dB)4 to 40000 Hz4 to 40000 Hz 
Lower Limiting Frequency (-3 dB)1 to 3 Hz1 to 3 Hz 
Resonant Frequency (90° Phase Shift)24000 Hz24000 Hz[1] 
Inherent Noise (Microphone)<20 dB(A) re 20 µPa<20 dB(A) re 20 µPa 
Dynamic Range (3% Distortion Limit)>160 dB re 20 µPa>160 dB re 20 µPa 
Temperature Range (Operating)-40 to 302 °F-40 to 150 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C))0.003 dB/°F0.006 dB/°C[1][2] 
Static Pressure Coefficient-0.007 dB/kPa-0.007 dB/kPa[1][2] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)-.001 to +.001 dB/%RH-.001 to +.001 dB/%RH[2] 
Influence of Axial Vibration (0.1g (1 m/s²))65 dB re 20 µPa65 dB re 20 µPa[1] 
Capacitance (Polarized)20 pF20 pF[1] 
Polarization Voltage200 V200 V 
Housing MaterialStainless AlloyStainless Alloy 
Mounting Thread (Preamplifier)0.4606 - 60 UNS11.7 mm - 60 UNS 
Mounting Thread0.5 - 60 UNS12.7 mm - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.5 in12.7 mm 
Size - Height (with grid)0.64 in16.3 mm 
Size - Height (without grid)0.61 in15.5 mm 
Weight0.23 oz6.5 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