Chapter 9 - Specifications
Topology
Symmetric triaxial
Feedback
Force balance with capacitive transducer
Mass centering
Not required
Table 9-1 -
Technology specifications
Bubble level
Removable and can be protected by optional cover. This is an
optional accessory for models TC120-PH2, TC20-PH2, TC120-
PH2-XC and TC20-PH2-XC.
Digital bubble level
Graphical bullseye level is available via Centaur digital
recorder Web interface
Leveling
l
For models TC120-PH2, TC20-PH2, TC120-PH2-XC and
TC20-PH2-XC:
Optional bubble level
l
For models TC120-SV1 and TC20-SV1:
l
Integrated bubble level
l
Adjustable locking feet
l
For all models:
Optional tripod deployment cradle for rapid
leveling
Alignment
l
Vertical scribe marks for north-south
l
Precision guide in cover for straight-edge, line, or laser level
Table 9-2 -
Leveling and alignment specifications
Self-noise
See
and
Sensitivity
For 120 s models:
754.3 V•s/m nominal
For 20 s models:
753.1 V•s/m nominal
Precision
Within ± 0.5% of nominal at 1 Hz. See
Off-axis sensitivity
±0.5%
Bandwidth
For 120 s models:
–3 dB points at 120.2 s and 108 Hz
For 20 s models:
–3 dB points at 20.04 s and 108 Hz
Lower corner damping relative
to critical
0.707
Output impedance
2 x 150 Ω±1%
Calibration input impedance
For 120 s models:
120 kΩ
For 20 s models:
133 kΩ
Table 9-3 -
Seismometer Performance specifications
Chapter 9 - Specifications
16889R10 • 2020-11-12
Page 68
