Which method of capturing time event is more accurate?

Hello

I am trying to capture a timestamp of a few kinds whenever data acquisition receives a pulse, I have two methods (attached) which give a slightly different time. One method is to use the 'get time stamp' while the other is to use the 'Clock Tick". The format of the timestamp is okay too, but accuracy is the case, then I wonder what is the most accurate. Also, this VI is probably used on a real-time system (Labview RT) If a VI or the other can be used in real-time so that would not take on the accuracy.

Thank you

Precision of timing is not very good with both methods. Timestamp uses the computer clock time.  If you use computers until the time servers is available, you will remember that the computer clocks has derived seconds per day or more.  Long term (weeks to years) timestamp will be, on average, more accurate due to the continual delivery to zero by the time servers. However, maybe you'll see jumps because of these resets.

The number of cycles is derived from an internal oscillator to the computer.  Because the computer is more concerned about accuracy of timing Quen synchronization logic on the CPU (and devices chips), these oscillators are very stable nor precise.

The oscillator in your DAQ hardware is almost certainly more stable and undoubtedly more accurate internal clocks available.

Get the signal of data acquisition as a waveform and use the time t0 that. Before you set up your own atomic clock or clock GPS derived, that it probably the best you can do.  It is also more closely related to the acquisition as opposed to the timt, that data is read from the DAQ hardware.

Lynn

Tags: NI Software

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