Function generator Tuner

[Evilopinions]

I am trying to build a labview program that can tune the frequency of a function generator to a user specified frequency.I am hoping that the tuning tolerance be better than 1 percent.Only want to tune between 1 and 40KHZ. Should have one analogue input in order to read the frequency and one analog output to control the frequency.

Any pointers ? Any ideas ? Any source code or modules that I can build up on ?

Thanks in advance for your help//

[RalcoBe]

Everything depends on your budget, and specifications needed.

Do I understand right that you already have a function generator?

What are it's in- and outputs? Can it be tweaked?

For me, 2 solutions:

1) High budget and expectations: Buy some expensive NI-card

2) Low Budget and expectations: Do the communications DC-Voltage-based.

With the very cheap USB-6008 card you have 12-bit precision, so 4096 steps between 0 and 5 V

Use only signals between 1 and 4 volt, so you still have 2457 steps (0.04%)

0 to 40 KHZ is now possible in steps of 16Hz. 1,5 Volt gives you 6.66kHz

Of course, you need to have a DC-interface, or build one. Sometimes, the big knob in front is just a potentiometer.

Same thing for the feedback.

Take care of ground loops and signal filtering

Success !!

[Rolf Kalbermatter]

I am trying to build a labview program that can tune the frequency of a function generator to a user specified frequency.I am hoping that the tuning tolerance be better than 1 percent.Only want to tune between 1 and 40KHZ. Should have one analogue input in order to read the frequency and one analog output to control the frequency.

If you already have an analogue output you could simply do the entire function generator in LabVIEW software and output the desired signal through that output.