| 摘要 |
A standalone digital data recorder of site background noise, by seismological transducer, providing at least data H and V in the form of analog signals, includes an acquisition and analog/digital conversion card, which includes at least two analog channels and a digital output, each analog channel including an input, a programmable gain analog signal amplifier and a filter, an analog multiplexer being provided between the filters and an analog/digital converter; a user interface; a removable storage device for storing data, a drive unit for an operating program, which includes a unit for enabling recording conditions, recording and warning of the end of the recording.
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