Error-201314 whenever the engine killed

Hi guys,.

I'll build a test bed that takes a few smaller engine size measures. I use the 9188 cDAQ platform and a module in the series C 9401 to get the signal of an encoder that is mounted on the engine. Whenever I kill the engine I get code error-201314 saying the following:

DAQmx error: sampling Multiple clock pulses have been detected within a period of the
input signal. Use a sample clock rate that is slower than the input signal. If
you use an external sample clock, make sure this clock signal is within the j
Itter and voltage level specifications and seedless.

The way I have the configuration of the task, it's pulse tachometer to act as an external sample clock and charges against the edges of 20 MHz clock, so I can hardly believe I'm getting any type of engine accelerates faster than the clock of 20 MHz. Anyone has an idea what this message means? So, I wonder if I need to be more careful about the way my reasons are connected.

Thanks for the help,

Ryan

Hi Ryan,

Small defects on the edge rising or falling of your tachometer signal could be picked up as additional edges.  I suspect that the Act of powering the motor is presenting the noise on the line, whose meter is picking up as the edges in double during transitions.

The 9188 she supported for digital filtering on the meter inputs - introduced feature in DAQmx 9.4 for the 9188.  You can use the digital filtering to reject any pulses below a certain duration.  From your description, it seems this would be a likely solution to the problem.

In LabVIEW, you can define a digital filtering of the sample with a property node DAQmx Timing clock signal:

If you use a different API and ill have to find the equivalent property do not forget to let me know.  Remember that if you use a version of DAQmx before 9.4 you will need to update your driver to have the feature available for your 9188.

Best regards

Tags: NI Hardware

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