sampling waveform values and writing corresponding time values

[VSECorp]

I am sampling the frequency of a generator set using a 1126 module. The frequency values I am getting are approximately 60 Hz.

I am sampling at 150 samples per second and using the Index Waveform Array function to peel off the frequency waveform. Then I am running that waveform wire (brown) through a Get Waveform components function to seperate the t0, dt, and y components. I am taking the oranage wire from the Y portion to write those values to a spreadsheet file. Then I want to build an array of the frequency values and the time values and write that to file (transposing the array if need be).

I want one column to be the frequency values and the second column to be the correspond
ing time values for each of those data points. For example, starting at t=0:

Frequency (Hz) Time (s)
60.0 0
60.1 0.0066666
59.9 0.0133333
60.2 0.0200000
60.1 0.0266666
|
|
| end of first second
|
V
60.5 0.9866666
60.1 0.9933333
60.0 1.0000000
59.7 1.0066666


The time interval increments by 1/150 of a second each time a sample is taken (150 times per second).

I tried to use the Get Waveform Time Array function, but that returned a 10 digit number that did not appear to be related to the time in seconds.

Can someone please advise me on how I can get the corresponding time values in seconds for waveform data points in the situation described above? Thanks!

[Rob Cole]

One of the easiest ways to do this, if your data is always 1/150 second apart, would be to find the index of the point in question within the array and multiply by 1/150 of a second.

First point is stored at index 0 in the array and would be 0 times 1/150 = 0.
Second point is stored at index 1 in the array and would be 1 times 1/150 = 1/150.
etc.

[RobertoBozzolo]

Since you are aquiring at a constant sample time, you could try using the ramp pattern to generate the time column.
I attach a sample VI in which I generate the ramp starting from waveform characteristics and then create the 2d array to save to disk with Write to Spreadsheet File.vi.
Hope this helps
Roberto