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Trillium 360 Posthole
Summary
The Trillium 360 Posthole provides full bandwidth coverage for global seismology and teleseismic monitoring in a single instrument.
- Very broadband, exceptional performance that meets GSN operational requirements
- An extended low frequency range useful out to beyond a 10, 000-second time period
- Able to resolve below Peterson's new low-noise model (NLNM) dow to a 300-second time period
- A wide dynamic range with a clip level of +/-18.2 mm/s up to 10 Hz and 0.17 g above 10 Hz
- The lowest magnetic sensitvity of any broadband seismometer
Specifications
Specifications are subject to change without notice.
TECHNOLOGY |
|
| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive transducer |
| Leveling | Internal automated leveling ±5º |
|
Leveling initiation
Mass centering |
Automatic motorized re-centering, can be remotely initiated |
| Alignment | North line on top cap; optional alignment rod for downhole orientation |
PERFORMANCE |
|
| Self-noise | Below the NLNM from 300 s to 10Hz (see Performance tab) |
| Sensitivity | 1100 V-s/m ±0.5% precision |
| Bandwidth | -3 dB points at 373 s and 155 Hz |
| Clip level | 18.2 mm/s up to 10 Hz and 0.17 g above 10 Hz |
| Transfer function |
Lower corner poles within ±0.5% of nominal provided /
High-frequency response within ±1 dB of nominal up to 50 Hz |
| Temperature | ±10°C without recentering |
| Magnetic sensitivity | <0.03 (m/s2)/T |
INTERFACE |
|
| Velocity output |
40 V peak-to-peak
Selectable XYZ or UVW mode |
| Mass position output | Three independent voltage outputs |
| Calibration input |
Single voltage input for all channels, independent calibration enabled for each channel
Calibration in XYZ or UVW |
| Control lines | Mass Center, Calibration Enable, XYZ/UVW mode |
| Connector | 20-pin marine |
| Serial port |
RS-232 compatible serial IP (SLIP)
Onboard web server standard HTTP For enhanced instrument control and status: self levelling and mass centering, UWV/XYZ mode, short/long period mode, firmware updates, temperature, mass position, instrument status, serial number and factory info |
POWER |
|
| Supply voltage | 9 to 36 Volts DC isolated input |
| Protection |
Reverse-voltage protected
Auto-resettable over-current protection (No fuse to replace) |
| Power consumption | 800mW typical at 15V input |
PHYSICAL |
|
| Case design | Stainless steel pressure vessel |
| Diameter | 147.5 mm |
| Height |
443.4 mm not including connector or feet
450.5 mm including feet |
| Weight | 17 kg |
| Parasitic resonances | None below 100 Hz |
| Handling |
Eye bolt on lid for lifting cable
1300lbf (5800N) rated |
ENVIRONMENTAL |
|
| Operating temperature | -20ºC to 60ºC (ultra-low temperature option available, please contact Nanometrics) |
| Storage temperature | -40ºC to 70ºC |
| Shock |
20 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport |
| Water immersion | Rated to IP68 and NEMA6P for continous submersion |
Performance
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