Precise response needed

[DKLabView]

Precise response needed

    I made a vi to drive a vco circuit .I am varying the frequency from 70 to 148. For some values of frequeny  I am getting the exact respose ie the frequency.I am entering is getting at the output using Ni USB 6009 DAQ card, ie the 12 bit binary generated at DAQ output is sufficent. It have 12 bit digital output pin.I want to make the response more precise 

I am adding some value

148.1  1111 1111 1111

129     1011 1101 1001

Please help me to solve is issue

 Thanks in advance

with regards

DK

[DKLabView]

I am adding some value

148.1  1111 1111 1111

129     1011 1101 1001

Please help me to solve is issue

 Thanks in advance

with regards

DK

[mikeporter]

So an output from the vco is a 12-bit representation of the frequency that it is generating? There is probibly no way to increase the precision of that output.

You could however measure the voltage you are using to control the vco (to whatever precision you desire) and relate that to frequency. Where is that voltage coming from? Is it also being generated by the computer?

Mike...

[DKLabView]

I am using DAQ card to generate12 bit combination,for  each bit combination the VCO produces a voltage.With the program I am trying to produce the bit combination corresponding to the number(frequency) I am putting to the program.

 The DAQ is comnected to a DtoA then to VCO

I am getting the response exactly the same as number I am putting to program but not for all

[crossrulz]

Duplicate Post:http://forums.ni.com/t5/Digital-I-O/2-digit-decimal-to-12-bit-binary/m-p/2584021

Duplicate Post:http://forums.ni.com/t5/Digital-I-O/Precise-response-needed/m-p/2586339

Please keep it all in a single thread.