Ceyear 3943B, Руководство по эксплуатации

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6 Remote control
6.1 Remote control principals
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Different parameter types have one or more corresponding response data types. During a query, a data
type will be returned for a numerical parameter, and the response data is precise and strict, known as
"Speak precisely"
For example, when querying the automatic switching status of the IF panorama step value
(CALCulate:IFPan:STEP:AUTO?), the response data returned when querying is always 1, regardless of
which of the above four setting commands was previously sent.
a) Numerical parameters
Numerical parameters can be used in both instrument commands and common commands. A numeric
parameter receives all the usual decimal counting methods, including signs, decimals, and scientific
notation. If a device only accepts a specified numeric type, such as an integer, it will automatically round
up the received numeric parameters.
Examples of numeric parameters:
0 No decimal point
100 Optional decimal point
1.23 Signed bit
4.56e<space>3 Index mark e can be followed by a space
-7.89E-01 The exponent token e which can be upper or lower case
+256 Positive lookahead allowed
5 Decimal points can be used first
b) Extended numerical parameters
Most measurements related to instrument commands use extended numeric parameters to specify
physical quantities. Extended numerical parameters receive all numeric parameters and additional
special values. All the extended numeric parameters receive MAXimum and MINimum as parameter
values. Whether other special values, such as UP and DOWN, are received is determined by the
instrument's resolution capability, and all valid parameters are listed in its SCPI command table.
Note: The extended value parameter does not apply to general purpose commands or STATus
subsystem commands.
Examples of extended numeric parameters:
101 Numeric parameter
1.2GHz GHz can be used as an index (E009)
200MHz MHz can be used as an index (E006)
-100mV -100 mV
10DEG 10 degrees
MAXimum Maximum effective setting
MINimum Minimum effective setting
UP Increase by a step
DOWN Decrease by a step
c) Discrete parameters
When the number of parameter values to be set are finite, they are identified by discrete parameters.
Discrete parameters use mnemonics to represent each valid setting. Like remote control command
mnemonics, discrete parameter mnemonics have two formats, long and short, and allow for mixture of
upper and lower cases.
In the following examples, discrete parameters and commands are used together.
[SENSe:]DETector[:FUNCtion] AVG|FAST|PEAK|RMS