Operator's guide
digitizer will output data on that channel to the DCM, which will then store or transmit it with the rest of the data, according to the way it is configured.
Since it is an optional feature, the digitizer may not use the Pressure Mux channel to report pressure data. If this is the case, that channel may be used for another purpose. Likewise, the three channels marked Spare may not be used, depending on the optional features present in the instrument.
For more information on the format of data packets transmitted on the Mux channels, please refer to the documentation supplied with your digitizer.
Sensor mass control
There are three commands which can be relayed to an instrument through the DCM to control the position of its sensor mass. For each instrument the buttons which perform these commands (Centre instrument, Lock instrument, and Unlock instrument) can be found at the bottom of the relevant Digitizer Setup page. The type of sensor you have installed determines which, if any, of these commands have any effect.
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Lock and Unlock instrument are provided so that you can secure the seismometer's sensor mass for safe transportation. Once installed and unlocked, you should Centre instrument to move the mass to the correct position to start measuring data. During the execution of any of these commands, the system will display the three components of the mass's current position and update them once per second per component. When the masses are locked, the position readings will be in the region of 32,000 or −32,000 counts. When the masses are correctly centered all three readings should be less than ± 1,000 counts. Locking or unlocking the sensor mass typically takes several minutes to complete.
December 2005 | 75 |
