Campuses:
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| vetoshield:daq [2013/03/13 17:49] – [Software] wgilbert | vetoshield:daq [2013/05/20 15:44] (current) – [DAQ Overview] wgilbert | ||
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| ====== Data Acquisition System ====== | ====== Data Acquisition System ====== | ||
| ===== DAQ Overview===== | ===== DAQ Overview===== | ||
| - | Signals from the proportional tubes making up the Veto Shield are conditioned by preamp cards on the ends of the tubes. Conditioned pulses from 16 preamp cards (32 channels) are sent via a Low Voltage Differential Signaling (LVDS) ribbon to a Pulse Stretcher card in a crate in a corner rack. Each crate has a backplane mux that reads up to 8 stretcher cards, or 256 preamp channels. An IRIG time code is distributed to a Symmetricomm timing card in each DAQ computer, which generates clock signals synchronizing timing registers on the mux backplanes connected in its rack. Each time a tube triggers, a timestamped data packet is formed in the mux and transmitted via a multi-pin PCI cable to an NI PCI-6534 digital I/O card in the DAQ computer. The data is written immediately to disk. The disk files from the four computers are later read and the data collected in a database for post-processing. | + | Signals from the proportional tubes making up the Veto Shield are conditioned by preamp cards on the ends of the tubes. Conditioned pulses from 16 preamp cards (32 channels) are sent via a Low Voltage Differential Signaling (LVDS) ribbon to a Pulse Stretcher card in a crate in a corner rack. Each crate has a backplane mux that reads up to 8 stretcher cards, or 256 preamp channels. An IRIG time code is distributed to a Symmetricomm timing card in each DAQ computer which generates clock signals, synchronizing timing registers on the mux backplanes connected in its rack. Each time a tube triggers, a timestamped data packet is formed in the mux and transmitted via a multiconductor |
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| {{vetodaq: | {{vetodaq: | ||
| - | They were written in Labview 2008 and the file, when unzipped should create a directory of vi's with the same name. This should be copied into ...\LAbview20xx\instr.lib, | + | They were written in Labview 2008 and the file, when unzipped should create a directory of vi's with the same name. This should be copied into ...\LAbview20xx\instr.lib, |
| The following demo vi is useful for experimenting with the card when the IRIG time signal is not available. It will unzip to a Labview LLB compressed library file which contains all called subvis, so it can be run without installing the driver library above. | The following demo vi is useful for experimenting with the card when the IRIG time signal is not available. It will unzip to a Labview LLB compressed library file which contains all called subvis, so it can be run without installing the driver library above. | ||