Chapter 9
Transfer Function and Noise Floor
Trillium Compact User Guide
16889R5
2014-03-04
46
provides the ground motion response nominal parameters for 120 s models.
provides the ground motion response nominal parameters for 20 s models.
The ground motion sensitivity at
assumes an infinite input impedance at the digitizer. For
digitizers with low input impedance, it will become necessary to account for the fact that
source impedance of the differential outputs is 300
Ω
, ±1 percent (150
Ω
for each output).
Table 9-1
Ground motion response nominal parameters for 120 s models
Symbol
Parameter
Nominal Values
Units
Zeros
0
0
-392
-1960
-1490 ±1740i
rad/s
Poles
–0.03691 ±0.03702i
–343
-370 ±467i
-836 ±1522i
-4900 ±4700i
-6900
-15000
rad/s
Normalization factor
4.34493 x 10
17
(rad/s)
-5
Normalization frequency
1
Hz
Ground motion sensitivity at
754.3
V·s/m
f
0
z
n
p
n
k
f
0
S
f
0
