Calibration

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In order to acquire correct and validated measurement data appropriate calibration is needed. This is performed with the use of relevant protocols and equipment such as:

  • Pressure calibrator with high accuracy (Betz manometer), SCHILTKNECHT 612C, 0-1000mm H2O, accuracy 0.02% FS.
  • Digital micromanometer Furness Control Model FC012 ±1999 mm H2O, accuracy ±(0-0.7)%
  • Portable Pressure calibrator with pressure generator, GE Druck DPI615IS, up to 7barg, accuracy 0.025% FS.
  • Digital Thermocouple calibrator (Digistand Type 4415), accuracy 0.2%
  • Digital Voltometer (HP 3455 A) which makes AC voltage measurements with five digit resolution and DC voltage and resistance measurements with 5 or 6 digit resolution as programmed by the user. Its accuracy is 0.001% of range for DC voltage, 0.002% of range for AC voltage and 0.0001% of range for Resistance. It employs an automatic calibration (AUTO CAL) feature which automatically corrects for possible gain and offset errors in the analog circuitry to provide maximum accuracy. A removable reference module permits external calibration of the DC voltage and resistance functions. The reference module can be removed, calibrated and returned to the instrument, or the module can be replaced with another recently calibrated reference.
  • The Calibration Exciter B&K Type 4294 is intended for precise field calibration of vibration transducers, rapid calibration and checking and quick, easy field calibration of vibration measurement and recording systems utilizing piezoelectric accelerometers. The exciter permits accurate adjustment of measuring instrumentation at a standard acceleration level of 10 ms-2 ± 3% RMS at 159.15Hz ±0.02% (max load 70gr). The reference signal may additionally be used for velocity and displacement calibration, at 10 mms-1 and 10 µm respectively
  • The Sound intensity calibrator B&K Type 3541 is intended for calibration of intensity measuring instruments by using a coupler designed especially for sound intensity calibrations. Intensity-probe microphones are positioned in the coupler which, in conjunction with a pistonphone, simulates a plane sound wave propagating along the axis of the probe. The instrument’s sensitivity to both sound intensity and particle velocity can then be calibrated. The pistonphone can also be used for sound pressure calibrations. In addition to calibration it can also be used to measure the pressure-residual intensity index spectrum of instruments used for measuring sound intensity. The simulated levels at 250 Hz are: Sound Pressure Level:118 ±0.4 dB re 20 μPa, Sound Intensity Level:117.85 ±0.5 dB re 1 pWm–2 and the Particle velocity level:117.7 ±0.6 dB re 50nms–1.