Error-20020 when you use Express "Filter" VI?

Help for error-20020 indicates the cut-off frequency Fc must answer 0<= fc=""><=>

Implement

Using LIFA read an Arduino Uno's analog input signal to about 125 samples per second.

Using Express 'Filter' VI to filter the data. The filter is set to low-pass, Fc = 10 Hz, Type Buterworrh and IIR.

The Express filter works when CF is set to 0.5 Hz.

Why the CF must be st to a lower value to! / 100 of the sampling frequency?

What does do to get a low pass frequency of 10 Hz wien cut-off sampling rate is 125 samples per second?

Howard

If you right-click on the express VI and select open front panel, you can transform into a Subvi regular and forest down into it and see how it works.  You will see in his heart basic filter functions, you can find in the range of Signal Processing.  There are also "Point by Point" filters in this palette that allow you to work a stitch at a time.  They also have an entry that allows you to tell him what really is the sampling frequency.

Tags: NI Software

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