Guralp-systems CMG-3T Manuel d'utilisateur télécharger pdf (Page 29)

Operator's guide

3. Repeat this measurement for several tilt angles.

4. For the vertical sensor, the input acceleration is given by

a = g sin φ, whilst for the horizontal sensor, it is

a = g ( 1 – cos φ ).

Calculate the input acceleration for each of the tilt angles used,

and plot a graph of mass position output against input

acceleration.

5. The gradient of the line obtained gives the sensitivity of the coil

(in V/m/s², if g was measured in m/s² and the mass position in

V.)

6. The coil constant K is equal to this sensitivity divided by the

value of the displacement feedback resistor, as given on the

calibration sheet.

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Guralp-systems CMG-3T Manuel d'utilisateur Page 29