Disconnect and delete all instrument objects
instrreset
instrreset disconnects and deletes all
instrument objects.
If data is being written or read asynchronously, the asynchronous operation is stopped.
instrreset is equivalent to issuing the stopasync (if needed),
fclose, and delete functions for all
instrument objects.
When you delete an instrument object, it becomes invalid.
Because you cannot connect an invalid object to the instrument, you should remove it
from the workspace with the clear command.