151D Characteristics; 151D-120 Transfer Function - Reftek 151D User Manual

Rev A

9 151D Characteristics

9.1 151D-120 Transfer Function

The sensitivity of each 151D-120 is based on the test data chart in the
product package.
The transfer function is as follows:
�� ( �� ) =
��
( �� + ��. �������������� ∙ �� + ��. ���������������� )
Where:
K = 2000 V/(m/s)
A = 252662
0
Zeros: 2 (radians)
z1 = 0
z2 = 0
Poles: 4
p1 = -3.70240e-002 +3.70240e-002i
p2 = -3.70240e-002 - 3.70240e-002i
p3 = -3.55431e+002 +3.55431e+002i
p4 = -3.55431e+002 - 3.55431e+002i
22
REF TEK 151D Broadband Seismometer Users Guide
151D-UG
�� ∙ ��
��
Seismometer sensitivity:
Normalization coefficient
��
∙ ��
��
( �� + ������. ������ ∙ �� + ������������ )
12/4/2023
Reftek Systems Inc.