Generating Measurement Complete
The NI 4060/4065 and NI 4070/4071/4072 can generate a trigger after taking a measurement. This digital trigger is called Measurement Complete (MC), and can be routed to destinations including PXI trigger lines (TTLn) (NI PXI-4060/4065 and NI PXI-4070/4071/4072 only) and the external 9-pin AUX connector. You can configure the destination of the trigger using niDMM Configure Meas Complete Dest. Refer to niDMM Configure Meas Complete Dest for all of the destination options for MC.
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Note If the NI 4060 is controlling SCXI through the front panel connectors, the MC signal is routed to External by default. If it is controlling SCXI through the internal PXI/SCXI communication lines, the MC signal is routed by default to TTL0, which in turn is routed to an internal PXI/SCXI line. If the NI 4060 is not controlling SCXI, the default setting for the MC signal is None. |
One reason for generating a trigger after every measurement is to trigger a switch module to advance to the next entry in its scan list.
You can configure the polarity of the MC signal using niDMM Configure Meas Complete Slope. Set Slope to Positive or Rising Edge to generate an MC signal that pulses high. Set Slope to Negative or Falling Edge to generate an MC signal that pulses low. Switches generally can only be triggered on Falling Edge.
Refer to Scanning Switch Modules for more information about using MC in a switching system.
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Note For waveform acquisitions, the MC signal is generated after the entire waveform is acquired, not after each point. |