I don't get the desired pulse a counter in an SMU-6363 on every nth in pulse.
I am in a position certain characteristics of the impulses of the encoder. I need to generate a pulse ON this about-face with every pulse of the nth encoder in.
This impulse generated will be used to trigger measures andcounter analog acquisition on other counters in the SMU-6363.
I have attached my code. I expect to have a pulse on the same length of high and low.
This is not the case. What I'm doing wrong here? I use SMU-6363.
Magyar salvation,
It is not a voltage divider (the 6363 input impedance is > 10 GOhm), but rather what we call 'ghosts' where high source impedance increases the time of the multiplexer and causes channels to affect another. The behavior you reported in your other post has the same cause.
I think that the same behavior is at the origin of many of the dupilcate to be registered where the output of the ctr is 0V and the output of the encoder is 5V (or perhaps transiiton of 0 to 5V). When the MUX switches to 0V on the 5V channel, it takes time to charge the capacitor 100 pF on the ADC. The amount of time it takes is relatively high due to the resistance of 10kOhm (on your encoder) that the capacitor will charge through. Meanwhile, the line (as evidenced by the counter input source) is obviously drawn below the TTL and causing a double edge to be registered.
Digital filtering still may not be a bad idea, even with the encoder active drive as source counter line is always connected to the entrance of a multiplexer - when there is no doubt that I generally include it for good measure.
Best regards
Tags: NI Hardware
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