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Trying to log data - some seems to be missing

I have a Tektronix TDS1012B with a memory of 2500 samples.

I am trying to log continuously using Labview signal express 2.5.1 tektronix edition.

I set up an aquire step then a save to ASCII step. Then I click run (not the run once button). Then I click stop.

I run for about 4 seconds and get 10ms worth of data. 

 

I can see it saying idle -> running -> waiting for trigger four times while I run for approx 4 seconds.

 

The signal is a 50hz square wave with a positive pulse width of 1 to 2 ms.

I have set the oscilloscope to  a timebase of 250us, which gives 1 microseconds for each sample.

 

I have attached my project file and the ascii file that results.

Please help.

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