Supposing you are using an acquisition card to read your signals and perform a multipoint acquisition, you can trust the daq card's clock to maintain the scan rate constant, so you can build an array of time values starting from the time you begin acquisition (as returned by the computer clock) and using the 'Actual scan rate' returned by AI Start.vi as an increment. Look into 'Get Waveform Time Array.vi' as an example.
Roberto
