This is regarding counting with microsecond accuracy and furthur simultaneous AO and counter usage
hi, i am in seruios trouble. I am doing photon counting using a PMT. so the TTL pulses come at random and the i canhave 1e6pulses/sec tp 1pulse per sec kind of TTL pulses. I need to count them with an accuracy of [ time bins ] 50 microseconds. I am not able to do this with all the possible examples i have seen on labview site as well as that which come with labview package. everything shows some or other error. I have been using labview for analog I/O for about 2 years and have done the most i could understnad but to of no use. does anyone have a sample program ? now the bogger problem is that while counting these TTL pulses i ALSO have to do an analog output [ say a triang
ular wave on AO channel ]. I was wondering that if i just add the AO vi's in the counting programme will they interfere with each other ? [ I have a very crude counting program which atleast gives me millisec accuracy limited by for-while loops ]or i shd trigger start them together [ counting and AO] and some how make sure that they do not interfere with eacht other. If anyone could help me with either or both program..i'll be very grateful.
gvs
A simple event counting example can count TTL pulses for you pretty easily. If you have an E-Series board, the DAQ-STC counter/timer uses a 20 MHz timebase, so your pulses must be separated by at least 50 nanoseconds. The 660x family of counter/timer boards use an 80 MHz timebase giving you a tighter window of 12.5 nanoseconds.
For your second problem, it's best to use dataflow and enforce a well-defined execution sequence. In other words, wire the error clusters such that AO always executes after (or before) your counter operation.
In fact, you must enforce serial execution of DAQ VIs to avoid blocking if you are using Traditional NI-DAQ. If you are using the new DAQmx, DAQ operations are supposedly non-blocking in many scenarios. I have not tried to ve
rify that for myself so be cautious if you plan to run AO and counter code in parallel.
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Attachments:
Ni9401_triggeringclockcontinuously.vi 33 KB
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