Table T2. CMG3T broadband seismometer specifications.
| Item | Specification |
|---|---|
| Dimensions | 4.5 inch diameter 950 mm length |
| Pressure housing | Grade 5 titanium tested for 6000 m water depth |
| Measurement direction | Horizontal north/east and vertical |
| Output channels | Broadband velocity, mass position, tilt |
| Frequency response | Velocity response between 360 s and 50 Hz |
| Channel mapping | Vertical: Z2, north/south velocity: N2, east/west velocity: E2 |
| Vertical mass position: M8, north/south mass position: M9, east/west mass position: MA | |
| Calibration signal: X2 | |
| East/west tilt: MF, north/south tilt: MC | |
| Nominal sensitivity: | |
| Velocity channels | 2 sensors: 750 V/m/s each, digitizer: 3.2 µV/count |
| Mass position | Sensor: 2500 V/m/s2, digitizer: 290 µV/count (4 Hz), 1.13 µV/count (1 Hz) |
| Calibration | Digitizer: 3.2 µV/count, sensor calibration coil: 51 kΩ, 0.025 A/m/s2 |
| Tilt | Approximately 1200 counts for 1° tilt; MF channel positive for east tilt, MC channel negative for north tilt |
| Standard sampling frequencies | 100 Hz (velocity), 4 Hz (mass position and tilt) |
| 1 Hz (decimated velocity) | |
| Operational tilt range | Within 4.5° from vertical for velocity sensor |
| Sensor control | Leveling/Unlock/Lock/Centering/Calibration through command from serial communication line |
| Serial interface | RS-422, 57,600 bps, data transmission in GCF |
| Power requirement | 24–36 V DC |
| ~6 W when unlocking, 2.8 W running | |
| Connector | Seacon MINK-10-FCR 10 pin for power and serial communication |
| Time synchronization | Streamsync |
| Synchronization status given by ASCII status block | |
bps = bits per second. GCF = Guralp Compressed Format.
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