Agilent Technologies 2000 X-Series Servisní příručka stáhnout pdf (Strana 797)

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More About Oscilloscope Commands 37

Agilent InfiniiVision 2000 X-Series Oscilloscopes Programmer's Guide 797

Query Return Values

Command headers immediately followed by a question mark (?) are

queries. Queries are used to get results of measurements made by the

instrument or to find out how the instrument is currently configured.

After receiving a query, the instrument interrogates the requested function

and places the answer in its output queue. The answer remains in the

output queue until it is read or another command is issued.

When read, the answer is transmitted across the bus to the designated

listener (typically a controller). For example, the query :TIMebase:RANGe?

places the current time base setting in the output queue. When using the

Agilent VISA COM library in Visual Basic, the controller statements:

Dim strQueryResult As String

myScope.WriteString ":TIMebase:RANGe?"

strQueryResult = myScope.ReadString

pass the value across the bus to the controller and place it in the variable

strQueryResult.

Infinity

Representation

The representation of infinity is +9.9E+37. This is also the value returned

when a measurement cannot be made.

NOTE

Read Query Results Before Sending Another Command. Sending another command or

query before reading the result of a query clears the output buffer (the current response)

and places a Query INTERRUPTED error in the error queue.

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