Model Number
377B20
PRECISION CONDENSER MICROPHONE
Revision: K
ECN #: 42896
Performance
ENGLISH
SI
Nominal Microphone Diameter
1/2"
1/2"
Frequency Response Characteristic
Random Incidence
Random Incidence
Open Circuit Sensitivity
50 mV/Pa
50 mV/Pa
[3]
Open Circuit Sensitivity
(± 1.5 dB)
-26 dB re 1 V/Pa
-26 dB re 1 V/Pa
[3]
Frequency Range(± 1 dB)
5 to 6300 Hz
5 to 6300 Hz
Frequency Range
(± 2 dB)
3.15 to 12,500 Hz
3.15 to 12,500 Hz
Lower Limiting Frequency(-3 dB)
1.0 to 2.4 Hz
1.0 to 2.4 Hz
Resonant Frequency(90° Phase Shift)
12,000 Hz
12,000 Hz
[1]
Inherent Noise
<15 dB(A) re 20
µPa
<15 dB(A) re 20
µPa
Dynamic Range(3% Distortion Limit)
>144 dB re 20 µPa
>144 dB re 20 µPa
Standards Designation(IEC 651)
Type 1
Type 1
[4]
Environmental
Temperature Range(Operating)
-40 to +248 °F
-40 to +120 °C
Temperature Coefficient of Sensi14 to +122°F (-10 to +50°C))
0.005 dB/°F
0.009 dB/°C
[1][3]
Static Pressure Coefficient
-0.01 dB/kPa
-0.01 dB/kPa
[1][3]
Humidity Coefficient of Sensitivity(0 to 100%, non-condensing)
± 0.001 dB/%RH
± 0.001 dB/%RH
[3]
Influence of Axial Vibration(0.1g (1 m/s²))
63 dB re 20 µPa
63 dB re 20 µPa
[1]
Electrical
Capacitance(Polarized)
11 pF
11 pF
[1]
Polarization Voltage
0 V
0 V
[2]
Physical
Housing Material
Stainless Alloy
Stainless Alloy
Venting
Rear
Rear
Mounting Thread(Preamplifier)
0.4606 - 60 UNS
11.7 mm - 60 UNS
Mounting Thread
(Grid)
0.5 - 60 UNS
12.7 mm - 60 UNS
Size (Diameter x Height)(with grid)
0.52 in x 0.64 in
13.2 mm x 16.2
mm
Size (Diameter x Height)
(without grid)
0.5 in x 0.6 in
12.7 mm x 15.3
mm
Weight
0.28 oz
7.8 gm
[1]
All specifications are at room temperature unless otherwise specified.
In the interest of constant product improvement, we reserve the right to change specifications without notice.
ICP
®
is a registered trademark of PCB Group, Inc.
OPTIONAL VERSIONS
Optional versions have identical specifications and accessories as listed for the standard model
except where noted below. More than one option may be used.
NOTES:
[1] Typical.
[2] Prepolarized
[3] re 250 Hz
[4] The microphone uses 50% to 70% of the frequency tolerances allowed by this standard.
SUPPLIED ACCESSORIES:
Model ACS-20 Calibration of Precision Condensor Microphones (1)
Entered: AP
Engineer: MJN
Sales: MV
Approved: MT
Spec Number:
Date: 5/7/2014
Date: 5/7/2014
Date: 5/7/2014
Date: 5/7/2014
31214
3425 Walden Avenue, Depew, NY 14043
Phone: 716-684-0001
Fax: 716-684-0987
E-Mail: [email protected]
