signal generation frequency

[nim21kr]

Hi, now I am using the labview with myRio to generate PWM signal.

In order to figure out operating labview with myrio, I have tested some simple things.

What I found in the signal generation module is the frequency in labview is totally different the frequency of real time which is shown by ocsilloscope.

For example, let's assume that I generated sine wave form(amaplitude is 1)

if I put the 10.1(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 10s(time)

if I put the 100.1(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 2.5s(time)

if I put the 10.2(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 5s(time)

if I put the 10.3(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 3.32s(time)

if I put the 10.4(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 2.5s(time)

if I put the 1.4(hz) as a frequency in labview, then real time frequency in oscilloscope measurement value was 716ms(time)

I can't find any rules from here.

How can I match up the frequency in labview with real time frequency measured by ocsilloscope.

also how can I generate sinewave form with high frequency such as 1Mhz or 100kHz etc..

Please help me.

I have attached my file.

[moderator1983]

Can you save your VI in version 2012 and re-post it.

[nim21kr]

Thank you for your reply.

Since I don't have Labview2012, I attached my problem with word file.

This is very simple topologies and I just want to generate same frequency in Labview as real time frequency in oscilloscope.

please check it.

thank you very much!

[moderator1983]

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@nim21kr wrote:

Thank you for your reply.

Since I don't have Labview2012, I attached my problem with word file.

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You can still save you code to previous version.