HP8757 scalar analyser

Having a few struggles with to gather some drivers for the HP8757.  Have the C, D and E version.  Usually when you query the instrument, there is a question mark (?) at the end of the query string.  To get the number of points that the 8757 parameter, it indicates that the command is simply "OPSP" - no question mark in sight.  I can't write with an entry VISA, which he hangs up the bus.  Tried reading, with the same result.  I have to then reread this number.  When I do not write the string "OPSP", I get a screen on the screen of the 8757 indicating it will send data to the GPIB, but I get an error Code and I have to predetermine the instrument to clear the bus.


Tags: NI Hardware

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