Frequency in an oscilloscope simulation

[brekfast]

Every time I try to find frequency on this problem I get the same answer - and according to the simulation it is incorrect.

Here's a picture of the simulation.

Please note: I am just trying to find frequency. I know the other two variables (.6A and 6V ; these are confirmed correct)

[PLAIN]http://img854.imageshack.us/img854/100/screenshot20110724at104.png



Looking at this image, I see only 2 and 1/4 cycles.

Frequency is, essentially, cycles per second (1/s) and period is the time it takes to complete a single cycle.

Based on the image I attached, I see 2 and 1/4 cycles (9/4) over a time of .5e-6 s. This is the same as dividing (9/4) by (.5e-6).

(9/4) / (.5e-6) = 4.5e6 s^(-1)

I do not understand where my mistake is.

 

[MisterX]

The time scale setting for an oscillisope is usually in terms of time/division. 0.5e-6 s would correspond to the distance between vertical lines.

 

[brekfast]

Derp! I knew that but I guess I had a brainfart.

Thanks! I got the correct answer (5e5 s^-1)

 

[ehild]

One period (minimum to minimum) is 4 units on the time scale. The oscilloscope shows the length of such units, it is 0.5 x 10^-6 s.

ehild

 

[rwisz]

It is important to note that in order to accurately measure frequency on an oscilloscope, the signal being measured must be a periodic waveform. If the waveform is not periodic, it may appear to have a certain frequency, but it is actually a combination of multiple frequencies.

In this case, it is possible that the signal being measured is not a pure sine wave, but rather a combination of different frequencies. This could explain why you are getting the same frequency every time, even though it may not be the correct frequency.

I would recommend checking the signal being measured and making sure it is a pure sine wave. If it is not, you may need to use other techniques, such as Fourier analysis, to accurately determine the frequency. Additionally, make sure you are using the correct settings and units on the oscilloscope to measure frequency.

It is also possible that there could be an error in the simulation itself. I would suggest double checking the simulation and its settings to ensure accuracy.

In summary, to accurately measure frequency on an oscilloscope, make sure the signal being measured is a pure sine wave and double check all settings and units. If you are still getting the same incorrect frequency, there may be an error in the simulation or other factors to consider.