Trillium Compact Broadband Seismometer
The Trillium Compact combines the superior performance of a broadband seismometer with the installation convenience of a rugged geophone. Measuring only 5.04 inches in height and requiring no mass lock or mass centering, the Trillium Compact is easily deployed and minimizes site preparation and associated costs. The instrument incorporates a symmetric tri-axial force feedback sensor design with a response flat to velocity from 120 seconds to 100 Hz.
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Low-noise broadband seismometer performance with physical dimensions comparable to geophones
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Broadband performance, 120 second to 100 Hz, with improved noise floor at high frequency
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Exceptionally high clip level of 26 mm/s permits on scale recording of larger events closer to the source
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Ultra low power consumption of just 160 mW for low operating costs and higher station reliability
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Ease of deployment through no mass lock, no mass centering and wide tilt range
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Integrated web server for efficient instrument management
TECHNOLOGY |
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| Topology | Symmetric tri-axial |
| Feedback | Force balance with capacitive transducer |
| Mass Centering | Not Required |
| Leveling | Integral spirit level |
| Alignment | Vertical scribe marks for N and S, holes for 5/16" alignment, rod for E and W |
PERFORMANCE |
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| Self-noise | See graph |
| Sensitivity | 750 V*s/m ± 0.5% precision |
| Off-axis Sensitivity | ± 0.5% |
| Bandwidth | -3db points at 120 s and 100 Hz |
| Transfer Function |
Lower corner poles within ±0.5% of nominal provided High-frequency poles within ±5% of nominal provided No peak in response at high frequency |
| Clip Level | 26 mm/s from 0.1 Hz to 10 Hz |
| Operational Tilt Range | ±2.5° |
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Parasitic Resonances |
None below 200 Hz |
INTERFACE |
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| Connector | 14-pin, shell size 12, MIL-C-26482 Series I, top mounted |
| Velocity Output | 40 V peak-to-peak differential Selectable XYZ or UVW mode |
| Mass Position Output | Single voltage output representing max mass position 3-channel mass positions available through serial port |
| Calibration Input |
Single voltage input and one active high control signal to enable all 3 channels. Remote calibration in XYZ or UVW mode Independent channel selection by serial port |
DIGITAL COMMAND AND CONTROL INTERFACE |
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| Digital Interface |
RS-232 compatible serial IP (SLIP)
Onboard web server standard HTTP |
| Digital Commands |
XYZ, UVW mode switching Calibration channel selection (off, enable all, u, v, or w) Short/long period mode Firmware updates State-of-health request |
| Digital Data Outputs |
Independent mass position values Instrument temperature Factory sensitivity User calibration data (poles and zeros) Instrument serial number and firmware revision |
POWER |
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| Supply Voltage | 9-36 V DC isolated input |
| Power Consumption | < 160 mW typical |
| Protection | Reverse-voltage and over-voltage protected Self-resetting over-current protection |
