Register shift problem

Dear LabVIEW forums,

I'm having difficulties of programming a structure that seems to work in theory on paper.  The structure or the procedure is based on the research of the cutoff frequency (unknown but I can tell you its approx.80Hz) a low-pass filter (which is integrated into a subvi).  Filter sub - vi has two inputs (the input voltage amplitude and frequency), and output (voltage amplitude).

My idea and the structure is to use a method of sharing half to find the cutoff frequency, based on frequency of 10 MHz (initial value) starting then... gradually halve the frequency to amplitude ratio (input/output) > 0.7071 (i.e. the - 3dB cutoff point) then...

to adjust the new test to 1.5 x the frequency of value frequency when amplitude ratio (input/output) > 0.7071 (i.e. with the frequency value above, but more close to half of the value of the previous frequency which was above the cutoff frequency).

Then re - test and adjust accordingly the same way until the test frequency is 1 Hz of the cut-off frequency, result of the amplitude (input/output) = 0.7071 report

The attached vi seems to partially work whereby the first half-split up to 76 Hz works however unexpectedly exceed it down to 38 Hz (it should have returned up to 114 Hz for the frequency of re - try (i.e. 1.5 x 76 Hz = 114 Hz).)

I tried different combinations of program but I'm all through and round in circles now.

Any help and assistance would be greatly appreciated.

Kind regards

I also changed some small things around so that it gives a better approximation, as making the multiplied value from 1.5 to 1.1 and lowering the number of initial frequency so that the result is more accurate. If it is not enough just to let me know =)

Tags: NI Software

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