(*) 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