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How does *opc cmd work on agilent E5071B

Question asked by ablo on May 23, 2013
Latest reply on May 28, 2013 by ablo
I am writing a GPIB cmd for the device mentioned above. During calibration I am sending "*opc?;:init1" to take a reading for a predefined sweep time,however The cmd "*opc?" Is not waiting for the completion of the sweeping time to return a value. 

When I perform the same cmd for hp8753c, the "opc?;sing;" wait for the sweeping time before it returns a value
Can someone please explain what need to be done on the E5071B for the *opc? To wait for the end of operation before returning a value.