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Geometrics Seismograph
Specifications
- A/D Conversion - 24 bit A/D process using 32 kHz over
sampling, digital anti-alias and decimation to users selected
sample rate.
- Dynamic Range - 135 dB theoretical, 113 dB measured @
2ms, 3 to 150 Hz
- Distortion - 0.005% @ 2ms, 3 to 150 Hz
- Bandwidth - 3.0 to 14 kHz, < 1Hz optional
- Common Mode Rejection - > -90 dB @< 100Hz
- Crosstalk - -85 dB @ 24 Hz
- Noise Floor - 0.25 uV, RFI @ 2ms, 3 to 150 Hz
- Trigger Accuracy - 1 microsecond
- Maximum Input Signal - 300 mV, P-P
- Preamplifier Gains - 36 dB, followed by 24 dB floating
point amplifier
- Anti-alias Filters - Digital, automatically selected to
correspond to sample rate. -3 dB corner frequency, down
80 dB at Nyquist, except -74 dB when sampling at 16 kHz
and none at 32 kHz.
- Sample Interval - 0.032, 0.064, 0.128, 0.25, 0.5, 1.0,
2.0 ms
- Record Lengths - 24,000 samples per channel for 12 or
24 channels, 12,000 for 36 channels or more.
- Line Testing - Real-time full waveform noise monitor.
- Power Consumption - 30 WE plus 1.0 W per channel
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