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What you need to do is set a either a sample count, or a trigger count.
example,
SAMP:COUNT 500 This tells the instrument to take 500 readings per trigger. So if you initialize the instrument 1 time with the INIT command, it will take 500 readings.
Alternately you can set a Trigger count intsead, TRIG:COUNT 500, which will set the instrument up to accept 500 triggers after it has been initialized with the INIT command. If you have the trigger source set to immediate, TRIG:SOURCE IMMEDIATE, The instrument will automatically trigger 500 times, if you set the trigger source to external or bus the instrument will only trigger on an external trigger or a *TRG, and basically you would have to send 500 triggers.
If you decide to use the commands together basically you end up with SAMP COUNT * TRIG COUNT = total samples. So if they were both set to 10, you would end up with 100 total readings.
Let me know if that helps answer your question.
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