Hi, I would like to use LabVIEW to capture the waveform already displayed on the screen of my Agilent Oscilloscope (model 54642D). With this waveform, I would like to obtain the current settings of the oscilloscope-channel as well (volts/div, time/div, probe atten., delay, offset, cursors with freq/period, etc.). In other words, I acquire a signal with the scope (not LabVIEW), adjust the scope settings to my liking on the front panel of the oscilloscope, and then I would like to capture the exact waveform displayed on the scope screen WITH the settings of the oscilloscope. I have been using the project-style driver, found here: http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=724 This works for controlling the oscilloscope settings and acquiring a waveform, but it's not what I want. I simply want LabVIEW to capture the current state of the oscilloscope display and settings used. Thanks much, Brad

Nothing will be mentioned in a manual about LabVIEW or VISA. What will be mentioned is the SCPI commands that you need to send to the instrument in order to request a setting. You linked to the user manual. There is probably a separate programming manual. That is the one you need. The basics would be to use a VISA Write to send the query (i.e CHAN1:COUP? to get the coupling) and then do a VISA read to get the value. You always have to write to the instrument first in order to tell it what data it should return. There is an Initialize function in the driver you have. Look at the block diagram and you'll see a VISA Write with a *IDN? command written and then a VISA Read returns the identification. You'll be doing the same basic procedure with different commands written. In MAX, you have a VISA interactive control option where you can do a query, write, or a read. A query combines a write and a read. That is what you will be doing so you can do all of your testing in MAX. When you have the query command correct, you can copy it into LabVIEW.

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Acquiring Agilent 54642D Oscilloscope Waveform AND Settings

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The read waveform function in the driver will scale it. The cursor positions, etc. would be a different read.

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Acquiring Agilent 54642D Oscilloscope Waveform AND Settings

Re: Acquiring Agilent 54642D Oscilloscope Waveform AND Settings