
808
Agilent InfiniiVision 7000A Series Oscilloscopes Programmer's Guide
11
More About Oscilloscope Commands
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.
N O T E
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.
Содержание InfiniiVision 7000A Series
Страница 1: ...Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide...
Страница 34: ...34 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 1 What s New...
Страница 44: ...44 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 2 Setting Up...
Страница 58: ...58 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 3 Getting Started...
Страница 652: ...652 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 5 Commands by Subsystem...
Страница 750: ...750 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 8 Error Messages...
Страница 784: ...784 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 10 Synchronizing Acquisitions...
Страница 810: ...810 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide 11 More About Oscilloscope Commands...
Страница 922: ...922 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer s Guide Index...