Analog Voltage Trigger

[SparkEE]

I am using LabVIEW 7 on windows 2000 with PXI 4461

I am trying to have the labview read the voltage coming in thru the analog input but start recording data when the voltage passes a certain threshold value. I tried an example "Continuous acquisition & graph voltage - Analog SW trig". The graph displays amplitude over samples. I am looking for amplitude over time. Any help is greatly appreciated.

Thanks,

SparkEE

[RossM]

Hello

I am a bit new to the forums. This is my first response to a question.

I think you need to use an XY Graph and create the time array yourself. I made a quick loop to show this.

I just made a for loop but you may need a while loop. The idea is the same.

[Dennis_Knutson · Accepted solution]

No, an xy graph is not required. A normal graph will display a regularly sampled signal with time on the x axis if you configure the graph's properties for either absolute or regular time. If you are acquiring a waveform data type, the graph will use the waveforms t0 and dt. Right click on the graph and make sure ignore timestamp is not selected.