Chapter 9
Transfer Function and Noise Floor
Trillium Compact User Guide
16889R5
2014-03-04
47
The seismometer sensitivity ( ), poles (
), and zeros (
) define the transfer function
according to this equation:
(EQ 1)
Where the normalization factor ( ) is defined by
(EQ 2)
and is given for informational purposes only.
Table 9-2
Ground motion response nominal parameters for 20 s models
Symbol
Parameter
Nominal Values
Units
Zeros
0
0
–392
-1960
-1490 ±1740i
rad/s
Poles
–0.2214 ±0.2221i
-343
-370 ±467i
-836 ±1522i
-4900 ±4700i
-6900
-15000
rad/s
Normalization factor
4.34491 x 10
17
(rad/s)
-5
Normalization frequency
1
Hz
Ground motion sensitivity at
753.1
V·s/m
z
n
p
n
k
f
0
S
f
0
S
p
n
z
n
F s
( )
S k
s z
n
–
(
)
n
∏
s p
n
–
(
)
n
∏
-----------------------------
⋅ ⋅
=
k
k
i
2
π
f
0
p
n
–
(
)
n
∏
i
2
π
f
0
z
n
–
(
)
n
∏
-----------------------------------------
=
