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<br />Chapter 2 Specifications <br />Specifications <br />Data Recorded One (1) acoustic and three (3) seismic channels. <br />Frequency Response Mini-Seis: 2 to 500 Hz. (-3 dB. points) at 2048 samples per second. <br /> Lower sample rates reduce the high frequency response <br /> proportionately. <br /> Mini-Seis II: 2 to 250 Hz. (-3 dB points) at 1024 samples per <br /> second. <br />Seismic Sensors Three component mounted velocity geophones or accelerometers, <br /> depending on the ordered recording ranges. <br />Microphone Ceramic element rated to at least 160 dB. <br />Memory Solid state with all summary, setup, and recorded data retained with <br /> power off. A lithium backup battery retains data if primary power <br /> fails. <br />Clock A 24 hour clock maintains the date and time accurate to within 1 <br /> minute per month, even if primary power fails. <br />Timer Mode Allows an instrument to be active only during selected hours on a <br /> daily basis. <br />Display The high contrast LCD has two lines of 40 characters to facilitate <br /> the instrument's setup. It also allows the operator to view operating <br /> parameters and summary data. <br />Optional Keypad Contains 6 keys for entering setup data and operating commands. <br />Power on Log A log of the last 64 on/off cycles is kept in memory to indicate the <br /> active monitoring periods. If the timer is used, the log is updated <br /> each time it activates. <br />Battery Internal 6 volt rechargeable. <br />Operating Time With a fully charged battery all models will operate from 7 to 10 <br />days at 1024 samples per sec. Longer times may be obtained <br />using the timer mode or external power from a small solar cell or <br />automobile battery. <br />External Battery Life A standard automobile battery will keep the internal battery at full <br />charge for several months at moderate temperatures. If the external <br />battery fails, the unit will continue to operate on its internal battery. <br />3