The value read by visa read that VI is not correct!
I design a labview program to control the Agilent E5072C Network Analyzer. When I want to get the value of this instrument, I use VI "VISA read" listed in the plate. However, the value read from this VI's latest measurement of time value. For example, the last time that the read value is 1.0 db, and this time the measurement value is 1.2 db. But when I use 'VISA read' VI to extract the value is 1.0 db.
Agilent also provide a VI for this device to read the measurement value and she was always correct value. If someone could tell me why? need to do any action before the value read from this instrument if I want to use VI "VISA reading" instead of Agilent VI?
You are probably reading too quickly. Reading it in NOR-MAX, you do it by hand, it takes more time. When you do that programmatically, it is "instant". Try using the * OPC? command to activate your order in a query. He returned then a '1' in the buffer. Read the '1' and then create the command fetch.
For Dennis:
I've had bad experiences with the drivers provided by the manufacturer to the point where I don't even try to use more. But Agilent is also anal about their drivers, because they are on their books, they should pose no problems.
Tags: NI Software
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