(*) spurious frequency at 140 Hz
All values base on the manufacturer specification sheet, and will scatter about 5%.
Values for geophones used in projects from December 2019
Damping Resistor = 9.090 kΩ
Gs = 27.7 V/(m/s); Ds = 0.7; fs = 4.5 Hz
2 Zeros
z1 = 0
z2 = 0
2 Poles
p1 = -19.78 20.20i
p2 = -19.78 -20.20i
Normalisation Factor
a = 1.0
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Values for geophones used in projects before December 2019
No Damping Resistor
Gs = 28.8 V/(m/s); Ds = 0.56; fs = 4.5 Hz
2 Zeros
z1 = 0
z2 = 0
2 Poles
p1 = -15.88 23.43i
p2 = -15.88 -23.43i
Normalisation Factor
a = 1.0