Charge Mode

B&K Type 4381 Piezoelectric Charge Accelerometer, Side Connector, Incl. Cable

B&K Type 4381 Piezoelectric Charge Accelerometer, Side Connector, Incl. Cable

Type 4381 is a piezoelectric, DeltaShear®, Unigain® accelerometer with side connector. Type 4381 features 10 – 32 UNF receptacle for output connection and can be mounted on the object by means of a 10 – 32 UNF threaded steel stud.


  • General purpose
  • High sensitivity
  • Low-level, low-frequency measurements


This piezoelectric accelerometer may be treated as a charge source. Its sensitivity is expressed in terms of charge per unit acceleration (pC/g).

The DeltaShear design involves three piezoelectric elements and three masses arranged in a triangular configuration around a triangular centre post. The ring prestresses the piezoelectric elements to give a high degree of linearity. The charge is collected between the housing and the clamping ring. The piezoelectric element used is a PZ 23 lead zirconate titanate element. The housing material is titanium.


The sensitivity given in the calibration chart has been measured at 159.2 Hz and an acceleration of 10 g. For 99.9% confidence level, the accuracy of the factory calibration is ± 2%.


Frequency range: 0.1 – 4800 Hz

Temperature: -74 – 250 C

Weight: 43 gram

Sensitivity: 10 pC/ms^-2

Residual Noise Level in Spec Freq Range (rms):  ±0.02 mg

Maximum Operational Level (peak): 2000 g

Electrical connector: 10-32 UNF

Mounting: Stud

Accessory Included: AO 0038

Clip/Stud/Screw included: YQ 2960

Output: Charge-PE

Unigain: Yes

Triaxial: No


Applications: General Purpose, Vibration Test

Unit: pC

Resonance frequency: 16 kHz

Maximum Shock Level (± peak): 2000 g