Graphic cursor size does not respect the Bode plot

Hello

I was wondering if someone would be able to shed some light on a problem I'm having about a graph XY cursor.

I developed a simple VI to determine the characteristics of a low-pass filter through which a sinusoidal signal ramp frequency and subsequently followed the gain of the filter to create a Bode plot.

Through the analysis of the curve of Bode I want to determine the cutoff frequency of depression go the filter under test. I introduced a slider in the chart and using a property node I have hoped to set the cursor to-3dB point in the Y axis and the corresponding sliders X post thus determining the cutoff frequency of the output filter.

However the slider seems never to follow the plot beyond the first stage of the loop. It feels as if there is a break in the conspiracy between the 1st and 2nd iteration of the while loop used for the ramp signal generator.

I tried to find why the cursor won't follow the plot at-3dB, but so far I am confused.

Any help or advice you could provide would be greatly appreciated! I have provided the attached VI for clarity.

I corrected your VI.

First of all, you need to put the property node AFTER the while loop, because you need the chart to be done first and then watch the cut off frequency.

Secondly, in LV, property nodes are read from top down. So you have to move the cursor to Y =-3 first, and then read the X position.

I have attached the corrected vi

Tags: NI Software

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