How low is low wrt LowFrequencyOneCounter

We want to measure the period using CIChannel.CreatePeriodChannel (). The pulses to measure are to about ~ 220 Hz. What is a frequency too high? Obviously, we would like to avoid using two counters for this, if we can avoid.

Nathan

Hi Nathan,

The method of low-frequency account database internal time of known frequency for a period of your input signal.  We can then say the period of your signal input with a resolution of ± 1 period of the time base.  This result is reversed to get the frequency of the signal.

The reason that the method is called "low-frequency", is that it is not suitable for frequency signals higher where 1 graduation of the internal time base would represent a significant percentage of the period of the signal.

Depending on your hardware, you would have a different basis of time available.  For example:

E series: 20 MHz, 100 kHz

M series: 80 MHz, 20 MHz, 100 kHz

X sereis: 100 MHz, 20 MHz, 100 kHz

Assume that a map of the E series using the time base of 20 MHz.

Input signal: 220 Hz

Period of the input signal: 4.5454545... Ms (1 / 220 Hz)

Base period of time E series: 50 ns (1 / 20 MHz)

So, for each period of your input signal, you will have about 90 k timebase ticks (4.5 ms / 50 LV).  Given that the resolution of the measurement is 1 timebase tick, it gives about 11 ppm the measurement error (1/90 k) at frequencies around 220 Hz.  For most applications 11 ppm should not be a problem (for example instead of 220 Hz 219,9978 Hz).  Many new DAQ (M or X Series) cards have a faster time base that would give an even smaller error.

Given that the accuracy of the time base of the multifunction DAQ cards more is of the order of 50 to 100 ppm, the 11 ppm of resolution of the measure will be probably adapted.

For more information, the X series user manual has a section describing the accuracy of the different methods of starting on page 7-18.  The "Quick sample" method applies only to new equipment as the X series, but other information should focus on most of the other DAQ cards.

In short, 220 Hz is generally not a frequency high enough to justify the use of one of the other methods.  The exception is if you use a Board with a very accurate oscillator (e.g. 6608) and are looking for more specific as possible (e.g. for calibration purposes).

Best regards

Tags: NI Hardware

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