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how to add data to a file

i wrote a program to get data from an hp oscilloscope to the pc using the
instrument driver. i have put the data acquisition in a loop and am writing
the data to a file inside the loop. this writes the data of each loop on
top of the previous one and so i have the data points of only the last one
loop. how do i insert the data of each loop into a file? i am using the hp54120A
oscilloscope

varghese
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The answer is that you should wire terminal named position offset for "Write to file". If you are using high level "Write characters to file" vi use "append to file" boolean input.
The all this stuff described in manuals and online help.
Sergey
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