PCB-378B20
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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 diameter 1/2 "
application diffuse field
Sensitivity in open circuit 50 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 frequency 1.0 ... 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 chip By 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 / ° F 0.009 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 voltage 0 V [5]
supply voltage 20 ... 30 V DC
Constant current supply 2 ... 20 mA
Bias voltage 10 ... 14 V DC
output impedance <50 ?
Maximum output range ± 7 V pk
physical properties
housing material Stainless Alloy
pressure equalization behind [6]
electrical connection BNC connector
Mounting thread (cap) 0.5 to 60 US
Size - diameter (with cap) 0.52 in 13.2 mm
Size - diameter (without cover) 0.50 in 12.7 mm
Size - Height (with cap) 3.62 in 91.9 mm
Size - Height (without cap) 3.58 in 90.9 mm
Dimensions 1.63 oz 45.8 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-42 Calibration of a microphone with preamplifier -1
(TLD) TEDS memory according to IEEE P1451.4
included supply
ACS-63 Calibration of a microphone with preamplifier -1
PCB-378B20

Specific References

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378B20_drawing_1.PDF

Technical drawing 1

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378B20_drawing_2.PDF

Technical drawing 2

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378B20_drawing_3.PDF

Technical drawing 3

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378B20_manual.PDF

Operating instructions

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