changing the x axis

[guidance microwave]

Hi everyone.

I have done an fft in lab view signal express, but the x axis shows the frequency (Hz).

I need it to show the range.

I have the formulae to change the x axis, but i am not sure on how this can be done!.

the formuale is range = freq *c*dT/(2*dF)

Where dT = 0.02

and dF = 66*10^6

c = 3*10*8.

how can i get the range on the x axis.

many thanks.

🙂

[Alain_S]

Right-click the graph and select Properties.
Then go to the Scales tab.
The drop down box shows by default the X-axis, so that's ok 🙂
If you need another scale, select it first.
On the same tab you also see Scaling factors Offset & Multiplier.
Calculate both to convert what you have now to what you want
I won't do the math's for you 😞
Enter the two values and

Then click the Ok button.

[guidance microwave]

Hi Many thank for your reply. Was very kind of you. you said in your post

"On the same tab you also see Scaling factors Offset & Multiplier"

But i cant see this when i click the scales tab....  😞

[Alain_S]

So you mean your Scales tab doesn't look like this one:

[guidance microwave]

Hi. No it is not the same. similar, except mine does not show the scaling factors or the inverted checkbox.

Although it does have a 'Timestamp Type'

😞

[Alain_S]

What LV version do you use?

Can you post your vi?

[guidance microwave]

what do u mean by vi. im sorry, but im a newbi to labview

the labview version is

LabView Signal Express, version 3.00

Installed applications

-DAQ Assistant

-Signal Express Components

[Alain_S]

I'm sorry but I overlooked the "Signal Express" part in your original post 😞

Anyway, I openend SE and in the Scales tab I still have "Scaling factors" Offset & Multiplier

[guidance microwave]

hmmmm, strange... not sure why mine does  not show it..

is there another way around it?

[guidance microwave]

which version of Labview SE are you running?