How to take a derivative of a sine wave?

[lilSebastian]

I know this is probably really simple and I am sure I am doing something stupid but please could someone help me.. I am just trying to plot the derivative of a sine wave on the same graph as the original sine wave. It seems to be working (it is displaying a cosine wave) but the amplitude is way off. Please could someone just point to me why the amplitude is off.. the original sine wave is going between 1 and -1 but the derivative is between 60 and -60

[altenbach]

Well, if you want help, show us your code. Is dt set correctly?

[John_P1 · Accepted solution]

Just speculating, but...

1. The derivative of a 10 Hz sine wave should have an amplitude of about ±60 (2*pi*10).
   
   
2. The Sine Waveform VI has a default frequency of 10 Hz.

Coincidence?

Best Regards,

[lilSebastian]

Sorry to the person above I thought I had attached my code. Yes you are totally right, I was using the sine wave vi and it was the 10hz problem. I thought I was just doing a sin(x) problem but it was sin(2*pi*ft) My maths ability here is the problem.

[lilSebastian]

Incase anyone ever wants the code it's here..