Newbie: Convert 1D Array to Waveform

[Cnuk]

I am new to Labview 7.1 so please be patient. I am using a USB DAQ card (non-NI) that outputs a 1D array of singles for each read command. This array includes no time data, only the A/D readings. I want to create a waveform so I can do meaningful FFT analysis and get actual frequencies...right now I only get frequency divided by sampling rate since the function must assume 1,2,3, etc for the time values.

I think I need to convert my 1D array to a waveform using the Build A Waveform VI so my signal can have a time base to go along with the data. Unfortunately, I cannot get it to work.

Can anyone please give me some pointers on getting my data which always starts in an array (1D for one channel or 2D for multiple chan
nels) into a waveform? Maybe also confirm for me that this is what I should be doing for analysis? Also any comment on analog vs. digital waveforms would be great. I thought all my A/D data was a digital waveform so I'm wondering what an analong waveform example would be.

Thank You

[Dennis_Knutson]

To create a waveform data type, use the Build Waveform function on the Waveform palette. Right click on the input labeled t0 and then Select Item>y. Right click again and select Add Element. If necessary do a select item on this input and change it to dt. You wire your 1D array to the y input and the reciprocal of the sampling rate (i.e. scans/sec) to the dt input.

An analog waveform is used whenever you want to display an analog signal that you've acquired. The software for the A/D board returns the result of the conversion as either floating point numbers or scaled binary. In either case, you would not want to use a digital waveform. A digital waveform is used to represent binary signals (1/0, On/Off).