Warning msg "Signal is not contiguous"

Hi,
I used NI FGen to generate a sine wave to pump into a circuit (under test) and use NI Hi-speed Digitizer to capture the output of the circuit.
The captured signal goes through a low pass filter. This warning message appear at the filter when it is Run continuously.
'Run Once' does not have problem.
Has this got to do with synchronizing the 2 modules in the PXI system or is it a matter of wrong sample rates.
I have searched Help and it mentioned using TClk to synchronize the 2 modules.
How do you use TClk in Signal Express?
How to solve this warning msg?
Someone please help.....thanks.
Regards,
SeeMist

Hello,
I am glad to hear that you resolved the warning issue. In regard to the other project, are you just interesting in generating the signal once? What is the lay out of the steps in the project for both the FGEN and SCOPE? Is the FGEN set to finite or continous generation mode? How is the SCOPE step setup in the Execution Control tab?
SeeMist wrote:
Currently (another project) I use the NI-FEN step to generate a signal from a .hws file (a 25khz burst signal).
It works fine by itself and the "Scope Soft Front Panel" (SFP) is always good at capturing the generated signal.
(The output of generator is externally connected to the input of the Scope).
However, after I closed the SFP and inserted NI-Scope Acquire step in Signal Express, I was not always successful in capturing the signal generated. Sometimes okay, sometimes not.
The error occurred at the FGen step : "Finite Generation timeout"
Do I have to initialise or there is a problem with my setting? Trigger or synchronization problem?
The setting of the FGen remains the same in both tests.
The NI-Scope: Trigger = Edge ; Sample rate =100MS/s; Record Length =5000
Samantha
National Instruments
Applications Engineer

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Hello!
I am acquiring data countinuously from several voltage output sensors. I am sending the waveforms through an express vi filter (bandpass) and I am using the default setting for IIR filtering. The program is setup such that data acquisition is done with a while loop. The DAQ wile loop is inside of a bigger while loop which is related to program start and stop.
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Attachments:
FIlterCase.zip ‏58 KB

Thank you for your answer.
From your answer I deducted that whenever I restart the data acquisition while the main program is still running I'd better make sure I reset the filter such that it will now "know" that it is new data coming in. I did not have a chance to check inside the express vi yet but from what you are saying it must be some sort of reset button in there that I could 'pull out' in the connector block of the subvi..
The band widths I am using are anywhere between 100 Hz to 40000 Hz so the transient duration will be short to very short and the system, the way it is setup now, will allow enough time to the IIR filter to handle correctly new data.
Finally there is always the option to acquire just the raw data. later I could read it back and filter it if necessary. However, there are situations when I want to filter out noise and possible alising frequencies; moreover, I acquire vibrations and forces in the same time on the same board - if I need the 40kHz sampling rate for vibrations, automatically I will have it too for the "low end" signals as well (0 to 10V from power and force sensors). I believe doing some filtering and maybe some decimation after filtering will help me keep the amount of data low on the 'low end' signals side. Am I correct in my assumptions?
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Message was edited by:
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