Guralp-systems CMG-3T Manuel d'utilisateur télécharger pdf (Page 45)

Operator's guide

The conventional-response feedback system has an additional parallel

feedback circuit, consisting of a non-inverting integrator in series with

a resistor. This arrangement results in two poles at specified

frequencies. The velocity response of a conventional-response system

is defined by a transfer function identical to that of a conventional

long-period sensor with a damping constant of 0.707 (1/√2) ζ

The seismometer can be supplied with an equivalent resonant

frequency of 0.033 Hz (30 seconds), 0.01 Hz (100 seconds) or 0.0083

Hz (120 seconds) as required. An active low-pass filter provides a high-

frequency cut-off point at a frequency you specify.

Comparisons

The figures below plot the comparative response of a conventional

velocity output broadband sensor and a hybrid output broadband

sensor. The first graph shows the response in terms of output against

input acceleration in units of V/m/s², whilst the second is plotted in

terms of output against input velocity, in V/m/s.

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Guralp-systems CMG-3T Manuel d'utilisateur Page 45