Seismic channels | Number | 4 – 8 |
| Format | 32 bit |
| Inputs | Differential with transient protection; ±10 V input range |
| Input impedance | 1 MΩ, 10 nF |
| Common mode rejection ratio | 110 dB at 10 Hz |
Mux channels | Number | 8 |
| Format | 24 bit |
| Inputs | Single ended; ±10 V input range |
GPS | Unit | External GPS (CMGGPS2) |
| Power | supplied through GPS connector |
| Time format | NMEA |
| Max. cable length | 50 m |
Sensor control | Functions available | Lock, unlock and centre sensor (active low CMOS); enable calibration |
Sensor calibration | Types | Sine and square wave; adjustable amplitude and frequency |
Digital signal processing | Type | Texas TMS320CV33 |
| Hardware sampling rate | 2 KHz |
| Sample output rates | 6 cascaded rates, each 2, 4, or 5 times lower than the previous rate (even integers only) |
| Anti-aliasing filters | 2 pole |
| Low-pass filters | FIR |
| Out-of-band rejection | 140 dB |
| In-band ripple | –140 dB |
| Trigger modes | STA/LTA, threshold, external trigger |
Digitizer performance | Output format | 32 bit |
| Noise-free resolution (NPR) | 22.5 bits at 20 samples/s; 21.5 bits at 100 samples/s |
| Absolute accuracy | 0.5% standard (0.1% optional) |
| Type | 5th-order, single-bit, low‑pass noise shaper |
| Analogue transducer outputs | 3-C signals |
Clock | Oscillator | 8 × 10–7 standard (5 × 10–8 oven-controlled optional) |
| External receiver interface | GPS RS232 and PPS |
| External receiver synchronisation | <50 µs |
Internal thermometer | Accuracy | ±0.33 °C (30 °C) |
Linearity | ±0.5 °C | |
Resolution | 0.0625 °C | |
Power | Supply | +10 to +24 V DC |
| Current at 12 V DC | ~0.12 A |