PCB-378B20

PCB-378B20

  • 1/2 "-ICP® precision microphone for diffuse field applications,
  • Combination of microphone capsule PCB-377 B 20 and preamp PCB-426E01,
  • Sensitivity 50 mV / PA,
  • Dynamic range > 135 dB,
  • Frequency range 3.75 … 12,500 Hz,
  • BNC connector,
  • As system calibrated,
  • No longer available (replacement: PCB-378C20)

basic data
Nominal microphone diameter1/2 "
applicationdiffuse field
Sensitivity in open circuit50 mV / Pa[3]
Sensitivity in the open circuit (± 1.5 dB)-26 dB relative to 1 V / Pa[3]
Frequency range (± 1 dB)7 ... 6300 Hz
Frequency range (± 2 dB)3.75 ... 12,500 Hz
Lower limit frequency1.0 ... 3.0 Hz
Self-noise (linear)<20 dB relative to 20 uPA
inherent noise<16.5 dB (A) relative to 20 uPA
Dynamic range (for distortion ?3%)> 135 dB in relation to 20 uPA
Dynamic range (maximum without taxes)138 dB relative to 20 uPA[1] [2]
TEDS chipBy default, integrated[4]
Operating conditions
The temperature range (operation)-40 ... 176 ° F-40 ... 80 ° C
Temperature coefficient of sensitivity (-10 ... 70 ° C)0.004 dB / ° F0.009 dB / ° C[1] [3]
Influence of static pressure-0.013 dB / kPa[1]
Influence by humidity (0 ... 100%, non-condensing)0.01 ... 0.01 dB /% RH[3]
Influence by axial vibration (0.1 g, 1 m / s²)66 dB relative to 20 uPA[1]
Technical characteristics
polarization voltage0 V[5]
supply voltage20 ... 30 V DC
Constant current supply2 ... 20 mA
Bias voltage10 ... 14 V DC
output impedance<50 ?
Maximum output range± 7 V pk
physical properties
housing materialStainless Alloy
pressure equalizationbehind[6]
electrical connectionBNC connector
Mounting thread (cap)0.5 to 60 US
Size - diameter (with cap)0.52 in13.2 mm
Size - diameter (without cover)0.50 in12.7 mm
Size - Height (with cap)3.62 in91.9 mm
Size - Height (without cap)3.58 in90.9 mm
Dimensions1.63 oz45.8 grams[1]
Hints
[1]typically,
[2]peak
[3]Relative to 250 Hz
[4]TEDS memory IEEE PP1451.4
[5]prepolarised
[6]Pressure equalization by the preamplifier
[7]Details: see PCB Declaration of Conformance PS064
included supply
ACS-42Calibration of a microphone with preamplifier-1
(TLD) TEDS memory according to IEEE P1451.4
included supply
ACS-63Calibration of a microphone with preamplifier-1

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