How long can I count edges on a USB-6229?

I have a USB-6229, and I want to count the edges using one of the built-in meters.  My question is what is the maximum frequency that the meter can the edges of the County of my signal?  (I will not mention what my signal frequency because I want to know how to determine the maximum value...)

Hello

Napo2 really seems to ask questions on the highest frequency that can be introduced to the counter to an external source.  The best spec for this is the counter 'external clock frequency Base', found in the specifications of 622 x, which claims 20 MHz.  The factor limiting here really is the bandwidth of the digital front end on the PFI lines.  Internally, the meter is able to count the time base of 80 MHz directly, but a signal to this rate would be completely mitigated by the digital front end of the card if you tried to pass from an external source.  The 20 MHz depends on having a square clean wave to come in the card, even if it is not very precise about the time of ascent or minimum pulse widths.  You might be able to go a bit beyond 20 MHz, if you have a very clean signal (and conversely, might not be able to hit 20 MHz if signal is not a clean square wave).

This KB previously bound doesn't seem to not relate to the original question of Napo2, and it is also somewhat misleading in general:

The measurement of the period is determined by the frequency source that can be acquired. For Counter/Timer boards, the highest frequency, we can accurately measure will depend on the time base higher frequency for the individual Council.

It's true, in the sense that the higher frequency time base is a factor that plays in the precision of a measurement of the period.  However, the KB seems to imply that the maximum that can be measured is the inverse of the maximum time base and does not give further guidance for the determination of the accuracy of the measurement period.  A better reference (if you were interested in these things) would be the table in the Manual X series, but even once, this is not really related to the original question.

Best regards

Tags: NI Hardware

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