changing time to the number of cycle

[Neka]

Dear Friends,

I will appreciate if anyone helps me.

I am trying to convert time to no. of cycle in my program. Actually I am reading temperature from externel device. I put my program in a loop and I can see temperature chart which varies with time. how can I get a out put of time from wavechart output and calculate it to no. of cycle?

I know the frequency of my external device which sends temperature to labview.

Regards,

Mehdi

[mikeporter]

In general, if you know the time the first sample was taken and the time between samples, a little simple math will tell you the time each sample was taken:

time_for_sample_n = start_time + (time_between_samples * n)

Given this, you can easily calculate an array of times for each sample, that you can then use for the x-axis of a graph.

Mike...

[Neka]

Hi Mike Thank you for your answering.

My program already has time on the x-axis. By adding a loop I can see the time table in the waveform graph.

I am trying to put a time condition ( if time>50 then continue the other connections of my program).

I do not know how to wire from wave chart and get time (the x-axis) and give it to a condition block.

I will appreciate if you help me.

Regards,

mehdi

[Will_S.]

The x-axis is calculated similarly to what was mentioned above. Since you are building the waveform, I would suggest calculating the number of samples that means time=50, then monitor the array size until it reaches that value. Use a case structure at that point to begin your next step.

[Neka]

Hi,

I wired from the out put of waveform to the formula block. in the formula block I wrote the formula, but it sees the temperature data in the formula instead of time.

the variable i difined in the formula is t , I think formula block authomaticlally uses temperature as the basic out put variable.

How can i insert time in the formula?

I appreciate your help,

Regards,

mehdi

[Will_S.]

Which formula block are you talking about, specifically? And what exactly do you mean by inserting time into the formula? Do you mean the time values that correspond to each y value in the graph?

[Neka]

Hi,

I think I did it.

As you can see in the attached file (the black section), I wired from waveform to the "Get Waveform Time Array "  and changed it to DBL and to dynamic data.

Now it works.

Thanks,

Mehdi