How to get the true time scale from the TDS 420A osilloscope?

[happybird]

Hellow!I have a question,i have used the "TKTDS read waveform.vi" to show the waveform in Labview 7.0,but i find that the time scale is different with the true scale in Oscilloscope,so how to correct it? and how to get the sample rate from the oscilloscope?

[bex]

hi

I'm not sure how you would go about getting the true time scale from your oscilloscope (in fact, I'm having similar problems myself with a LeCroy scope!) but as regards finding out the sampling rate, the following should work.

If your scope is like mine, the output from the "TKTDS read waveform.vi" should take the form of a cluster, which you need to unbundle with an unbundle node on the array palette. You will then see that this cluster is made up of an initial time t(0) at which the sampling begins, an array of voltage readings of the intensity and a time delta t which is the time taken between the recording of each element of your voltage array and is dependent on the timebase you have set the oscilloscope to. The reciprocal of this reading is your sampling rate.

Hope this helps!

Beck.