PCB-HT378B20
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PCB-HT378B20

  • 1/2 "-ICP® precision microphone for diffuse field applications,
  • Combination of microphone capsule 377 B 20 and pre HT426E01,
  • Operating temperature up to 120 ° C,
  • Sensitivity 50 mV / PA,
  • Dynamic range > 137 dB,
  • Frequency range 3.5 … 12,500 Hz,
  • BNC connector,
  • As system calibrated,
  • No longer available (replacement: PCB-HT378C20)
  • basic data
    Nominal diameter of microphone 1/2 "
    application diffuse-field
    Sensitivity in the open circuit 50 mV / PA [3]
    sensitivity in the open circuit (±1. 5 dB) -26 dB in relation to 1 V / PA [3]
    Frequency range (± 1 dB) 6 … 6,300 Hz
    (±2 dB) frequency range 3.5 … 12,500 Hz
    lower limiting frequency (-3 dB) 1.0 … 2.75 Hz
    Noise (linear) < 32 dB in relation to 20 µPa
    noise < 17 dB(A) in relation to 20 µPa
    Dynamic range (for THD ≤ 3%) > 137 dB in relation to 20 µPa
    dynamic range (maximum without clipping) 140 dB in relation to 20 µPa [1 ] [2]
    TEDS Chip integrated by default [4]
    conditions
    temperatureh (operating) -40 … 248 ° F -40 … 120 ° 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 in relation to 20 µPa [1]
    technical characteristics
    polarization voltage 0 V [5]
    supply 20 … 32 V DC
    constant power supply 2 … 20 mA
    Bias voltage 10 … 14 V DC
    output impedance < 55 Ω
    Maximum output range ±7 V pk
    physical properties
    Housing material stainless alloy
    pressure back [6]
    electrical connection BNC-Plug
    Mounting thread (cap) 0,5 - 60 UNS
    size - diameter (with cap) 0.52 in 13.2 mm
    Size - diameter (without protection cap) 0.50 in 12.7 mm
    size - height (with cap) 3.88 in 98.6 mm
    Size - height (without protection cap) 3.84 in 97.5 mm
    mass 1.74 oz 49.2 grams [1]
    notes
    [1] typically
    [2] peak
    [3] based on 250 Hz
    [4] TEDS memory in accordance with IEEE PP1451. 4
    [5] Prepolarized
    [6] pressure compensation by the pre
    [7] details: see PCBs Declaration of conformance PS065
    Accessories
    ACS-42 Calibration of a microphone with pre-amplifier -1
    (TLD) TEDS memory in accordance with IEEE P1451. 4
    Accessories
    ACS-63 calibration of a microphone with Vorverstä stronger -1
    PCB-HT378B20

    Specific References

    Download

    HT378B20_drawing_1.PDF

    Technical drawing 1

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    HT378B20_drawing_2.PDF

    Technical drawing 2

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    HT378B20_drawing_3.PDF

    Technical drawing 3

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    HT378B20_manual.PDF

    Operating instructions

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