Error to find the frequency of signal to tachometer

I use the vi "Extract only your Information" to find the speed of a motor.  The entrance is a monarch Laser Tach AC output.  Tach reading is very regular and the AC output is 5 volts peak.  There are a few negative pics, but these are at the speed of the engine.  My output frequency, who should read the changes back from 1800 1800 at a frequency near 5400, but not exactly 5400 (5321, etc.).  Y does it have no signal conditioning that I'm missing before signal to the vi "extract", for example, the window it and then use the frequency domain cutting-edge research?

Thanks in advance,

Ron

Matt,

Just to let you know that I put a bandpass filter in my vi.  I took the input of the speed estimated of the user and put in parentheses of the bandpass filter to be 25% below 25% above the target and the input of speed tachometer works very well!

Ron

Tags: NI Software

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