Model: 421B30

$710.00 USD
(Pricing valid in US only)

Differential charge amplifier for Dynamic pressure sensors to be used with PCB 176 sensors

  • Sensitivity: (±5%) 20.6 mV/pC
  • Output Voltage: ±5 Vpk
  • Temperature Range: -22 to +185 °F (-30 to +85 °C)
  • Housing Material: Aluminum

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Sensitivity (±5 %) (Voltage Output)20.6 mV/pC20.6 mV/pC[4][6] 
Sensitivity (±5 %) (Current Output)20.6 µA/pC20.6 µA/pC[4][6] 
Input Range±242 pC±242 pC 
Low Frequency Response (-3 dB)10 Hz10 Hz[2][5] 
High Frequency Response (-1 dB)5 kHz5 kHz[1][3][5] 
Non-Linearity≤1.0 % FS≤1.0 % FS 
Temperature Range (Operating)-22 to +185 °F-30 to +85 °C 
Temperature Response (Sensitivity Deviation)<2.5 %<2.5 % 
Excitation Voltage22 to 28 VDC22 to 28 VDC 
Output Bias Voltage7.3 to 7.7 VDC7.3 to 7.7 VDC 
Output Voltage±5 Vpk±5 Vpk 
Output Bias Current11 to 13 mA11 to 13 mA 
Output Current±5 mApK±5 mApK 
Output Impedance<770 Ohm<770 Ohm 
Broadband Electrical Noise (1 to 10000 Hz)1040 µV-60 dB[7][8] 
Spectral Noise (1 Hz)38 µV/√Hz-88 dB[7][8] 
Spectral Noise (10 Hz)54 µV/√Hz-85 dB[7][8] 
Spectral Noise (100 Hz)13 µV/√Hz-98 dB[7][8] 
Spectral Noise (1 kHz)10 µV/√Hz-100 dB[7][8] 
Spectral Noise (10 kHz)10 µV/√Hz-100 dB[7][8] 
Resistance (Minimum required at input)100000 Ohm100000 Ohm 
Source Capacitance Loading0.0009 %/pF0.0009 %/pF 
Housing MaterialAluminumAluminum 
Weight6.5 oz184 gm 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Above stated frequency, the amplifier becomes slew rate limited.
[2] The low frequency tolerance is accurate within ±20% of the specified frequency.
[3] The high frequency tolerance is accurate within ±20% of the specified frequency.
[4] Output can be set to either current or voltage output depending on the wiring configuration. See manual for wiring configuration.
[5] Frequency response tested with 1000pF input capacitor.
[6] Set to provide a 350 mV/psi or 350 µA/psi output when using a 17 pC/psi pressure sensor. If used with a pressure sensor with a different sensitivity, the output sensitivity will vary.
[7] Typical.
[8] Tested using voltage source and input capacitor equal to the feedback capacitor, to simulate a charge output sensor.
[9] See PCB Declaration of Conformance PS024 for details. A low impendance connection from case to earth ground is required to maintain CE compliance.
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