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설명The OMB-DBK7 frequency-input card provides OMB-LOGBOOK and OMB-DAQBOARD-2000 Series data acquisition systems with four channels of frequency-measurement capability. The card measures the input signal’s frequency and converts the frequency to a voltage, which can then be measured by the data acquisition system. The OMB-DBK7’s output is read by the data acquisition system along with any other analog channels included in the analog scan group, allowing easy correlation of readings from the OMB-DBK7 with other test parameters. As many as as sixty-four OMB-DBK7’s can be connected to one OMB-LOGBOOK and OMB-DAQBOARD-2000 series acquisition system, for a total of up to 256 channels.