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 Figure 10-2 on page76 and Figure 10-3 on page77
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 Table 10-1 on page74
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
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