How to use the time of 80 MHz with the example of the soul base angular Position-buffer-Cont-Ext Clk.vi

Hello:

I use the card PCI-6602 and am a bit new to the use of timer/counters.  I use the Commission to measure the position of a quadrature encoder.

I would use the time base internal 80 Mhz the map of 6602, but examples of LabVIEW will not allow that.  In the example, he States:

2. call the DAQmx Schedule VI (sample clock) to configure settings of clock synchronization external sample Mode Sample and sample clock Source.  The sample clock Source will determine when a sample will be inserted into the buffer.  The 100 kHz, 20 MHz and 80 MHz time bases can serve as the sample clock Source.  The Edge parameter can be used to determine when a sample is taken.

Is it possible to use the database internal time for my application?

I have attached the example vi that I use.

Thank you.

Pat

Hi, Pat.

The rate determines how fast the samples are acquired and put on the material buffer.  This value depends on the basis of time, which is specified by the source of the VI DAQmx calendar entry.  The default source on the PCI-6602 map is the on-board clock (80 MHz).  The rate must be a divisor of the source.  For example, 80 MHz, 40 MHz, 20 MHz, 10 MHz,..., would be acceptable values for the entry rate.

So the answer to your question would be to remove the entry from the source and ensure that the rate is a factor of the source.  Leaving this entry unwired will use the clock shipped by default of the unit, as shown in the screenshot below:

I hope this helps.

Tags: NI Hardware

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