BS ISO 16063-11:1999

Foreword
1 Scope
2 Uncertainty of measurement
3 Requirements for apparatus
   3.1 General
   3.2 Frequency generator and indicator
   3.3 Power amplifier/vibrator combination
   3.4 Seismic block(s) for vibrator and laser
        interferometer
   3.5 Laser
   3.6 Interferometer
   3.7 Counting instrumentation (for Method 1)
   3.8 Tunable bandpass filter or spectrum analyser
        (for Method 2)
   3.9 Instrumentation for zero detection (for Method 2)
   3.10 Voltage instrumentation, measuring true r.m.s.
        accelerometer output
   3.11 Distortion-measuring instrumentation
   3.12 Oscilloscope (optional)
   3.13 Waveform recorder with computer interface (for Method 3)
   3.14 Computer with data-processing program (for Method 3)
   3.15 Other requirements
4 Ambient conditions
5 Preferred accelerations and frequencies
6 Common procedure for all three methods
7 Method 1: Fringe-counting method
   7.1 General
   7.2 Test procedure
   7.3 Expression of results
8 Method 2: Minimum-point method
   8.1 General
   8.2 Test procedure
   8.3 Expression of results
9 Method 3: Sine-approximation method
   9.1 General
   9.2 Test procedure
   9.3 Data acquisition
   9.4 Data processing
10 Report of calibration results
Annex A (normative) - Uncertainty components in the
                      primary calibration by laser
                      interferometry of vibration and
                      shock transducers
Annex B (normative) - Formulae for the calculation of
                      acceleration
Bibliography

Gives the procedure and instrumentation to be used for primary vibration calibration of rectilinear accelerometers (with or without amplifier) to obtain magnitude and phase lag of the complex sensitivity by ready-state sinusoidal vibration and laser interferometry. Applies to a frequency range from 1 Hz to 10 kHz and a dynamic range (amplitude) from 0,1 m/s[2] to 1,000 m/s[2] (frequency-dependent).

This part of ISO16063 specifies the instrumentation and procedure to be used for primary vibration calibration of rectilinear accelerometers (with or without amplifier) to obtain magnitude and phase lag of the complex sensitivity by steady-state sinusoidal vibration and laser interferometry.

It is applicable to a frequency range from 1Hz to 10kHz and a dynamic range (amplitude) from 0,1m/s² to 1000m/s² (frequency-dependent).

These ranges are covered with the uncertainty of measurement specified in clause2. Calibration frequencies lower than 1Hz (e.g. 0,4Hz, which is a reference frequency used in other International Standards) and acceleration amplitudes smaller than 0,1m/s² (e.g. 0,004m/s² at 1Hz) can be achieved using Method 3 specified in this part of ISO16063, in conjunction with an appropriate low-frequency vibration generator.

Method 1 (fringe-counting method) is applicable to sensitivity magnitude calibration in the frequency range 1Hz to 800Hz and, under special conditions, at higher frequencies (cf. clause7). Method 2 (minimum-point method) can be used for sensitivity magnitude calibration in the frequency range 800Hz to 10kHz (cf. clause8). Method 3 (sine-approximation method) can be used for magnitude of sensitivity and phase calibration in the frequency range 1Hz to 10kHz (cf. clause9).

Methods 1 and 3 provide for calibrations at fixed acceleration amplitudes at various frequencies. Method 2 requires calibrations at fixed displacement amplitudes (acceleration amplitude varies with frequency).