PCB-378A21
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PCB-378A21

  • 1/2 "-ICP® precision microphone for diffuse field applications,
  • Combination of microphone capsule PCB 377A21 and preamp PCB-426E01,
  • Sensitivity 12.6 mV / PA,
  • Dynamic range > 147 dB,
  • Frequency range 4 … 25,000 Hz,
  • BNC connector,
  • As system calibrated
basic data
Nominal microphone diameter 1/2 "
application diffuse field
sensitivity 12.6 mV / Pa [3]
Sensitivity (± 2 dB) -38 dB relative to 1 V / Pa [3]
Frequency range (± 2 dB) 4 ... 25,000 Hz
Lower limit frequency (3 dB) 1.0 ... 2.4 Hz
inherent noise 26 dB relative to 20 uPA
inherent noise 22 dB (A), based on 20 uPA [2]
dynamic range > 147 dB relative to 20 uPA
TEDS chip By default, integrated [1]
Operating conditions
The temperature range (operation) -40 ... 176 ° F -40 ... 80 ° C
Temperature coefficient of sensitivity 0.003 dB / ° F 0.006 dB / ° C [3] [2]
Influence of static pressure -0.007 dB / kPa [3] [2]
Humidity coefficient of sensitivity 0.002 dB /% RH [3] [2]
Influence by axial vibration 67 dB relative to 20 uPA [2]
Technical characteristics
polarization voltage 0 V [4]
supply voltage 20 ... 30 V DC
Constant current supply 2 ... 20 mA
Bias voltage 10 ... 14 V DC
Maximum output range ± 7 V pk
output impedance <50 ?
physical properties
housing material Stainless Alloy
pressure equalization behind [5]
electrical connection BNC connector
Mounting thread (preamp) 0.5 to 60 US
Size - diameter (with cap) 0.52 in 13.2 mm
Size - Diameter 0.50 in 12.7 mm
Size - Height (with cap) 3.47 in 88.3 mm
Size - Height (without cap) 3.46 in 87.8 mm
Dimensions 1.59 oz 45 grams [2]
Hints
[1] TEDS memory IEEE PP1451.4
[2] typically,
[3] Relative to 250 Hz
[4] prepolarised
[5] Pressure equalization by the preamplifier
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-378A21

Specific References

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378A21_drawing.PDF

Technical drawing

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378A21_manual.PDF

Operating instructions

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378A21_specs.PDF

Technical data sheet

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