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DAQ Assistant+Waveform chart

I am a beginner to Labview. I made a very simple data acquisition file using the DAQ Assistant. What I want is to write data to file and display the realtime data on the waveform chart with respect to the "elapsed time", say, from 0 second to 500 seconds. However, no matter how I change the X-axis properties of the chart, it always shows the real time in terms of hh/mm/ss/dd/mm/year in absolute time setting or shows a very large number if I select the relative number. Could somebody tell me where is the problem? I attached the file with this message. Thanks.
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I've made a waveform chart which you might find helpful. Here are the steps I took to change the properties:
1)right click properties
2)Format and Precision tab
a. select x axis -> SI notation -> 2 digits of precion
3)Scales tab
a. select x axis -> deselect autoscale -> set min 0 and max 500

Hope this helps

Saul
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Thank you ,Saul. My Labview is version 7.0 so I couldn't open the vi you sent me. I followed your steps but once I hit the "run" button, it is still the same. When I checked the properties,I found the "autoscale" was selected again automatically. I tried it with some simulated signals and it worked fine. I guess the problem is in the DAQ Assistant.
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