P R O D U C T DATA Triaxial Charge Accelerometer Types 4321 and 4321-V Triaxial Charge Accelerometer Types 4321 and 4321-V are piezoelectric accelerometers with DeltaShear™ design. The accelerometers are suited to operate in temperatures up to 250 °C (482 °F) and to measure up to 10000 Hz. Uses and Features Uses General purpose vibration testing and analysis Vibration analysis on larger structures Measurements in high-temperature environments Multi-axis vibration and shock measurements Triaxial Wide frequency range Wide dynamic range High resonance frequency Description Type 4321 is a triaxial Unigain* accelerometer with three independent outputs for simultaneous high-level measurements. It features three 10 – 32 UNF electrical connectors and can be mounted with a 10 – 32 UNF threaded steel stud or an M4 screw. The housing material is titanium, and the piezoelectric element is PZ 23. Type 4321 is available as a V-type†. Type 4321-V has the same connectors, housing, specifications and long-term stability as Type 4321, but it has a relaxed sensitivity tolerance and transverse sensitivity. Characteristics This piezoelectric accelerometer may be treated as a charge source. Its sensitivity is expressed in terms of charge per unit acceleration (pC/ms–2, pC/g). The DeltaShear design consists of three piezoelectric elements and three seismic masses arranged in a triangular configuration around a triangular centre post. They are held in place by a clamping ring that isolates the configuration from the base. The ring also prestresses the piezoelectric elements to give a high degree of linearity. This design provides a high sensitivity-to-mass ratio, a relatively high resonance frequency and high isolation from base strains and temperature transients. * Unigain: The individual measured sensitivity is within ± 2% of the specified sensitivity † V-type: The individual measured sensitivity is within ± 15%

Calibration Each accelerometer is calibrated using random excitation and 1600-line FFT transformation to provide a high-resolution (amplitude and phase) frequency response. This yields a unique characterization and secures the integrity of your vibration measurements. The sensitivity given on the calibration chart is measured at 159.2 Hz with 95% confidence level using coverage factor k = 2. The upper frequency limits given on the calibration chart are frequencies where the deviation from the reference sensitivity at 159.2 Hz is within ±10%. The upper frequency limit is approximately 30% of the...

Specifications – Piezoelectric Charge Accelerometer Types 4321 and 4321-V Type No. General Weight Frequency Range (± 10% limit) Mounted Resonance Frequency Transverse Resonance Frequency Max. Operational Continuous Sinusoidal Acceleration (peak) Electrical Residual Noise Level (measured with NEXUS Type 2692-001 in the specified frequency range) Capacitance (excluding cable) Operating Temperature Range Temperature Coefficient of Sensitivity Temperature Transient Sensitivity (3 Hz Low. Lim. Freq. (– 3 dB, 6 dB/octave)) Max. Non-destructive Shock (± peak) Base Strain Sensitivity (at 250 με in the...

Configuration Examples Fig. 2 Cabling, signal conditioning and data acquisition hardware options for Brüel &Kjær’s family of triaxial charge accelerometers Female (F) Brüel & Kjær NEXUS Conditioning Amplifier Overload Super low-noise, single-screened coaxial cable, 10 – 32 UNF connectors, 250 °C (482 °F) Super low-noise, robust double-screened cable, 10 – 32 UNF connectors, 250 °C (482 °F) Super low-noise cable, 10 – 32 UNF to TNC, 250 °C (482 °F) Low-noise, double-screened cable, 10 – 32 UNF connectors, 250 °C (482 °F) Plug adaptor, 10 – 32 UNF (F) to TNC (M) Hexagonal key for 10 – 32 UNF studs...