User`s guide

53220A/53230A User’s Guide 75
53220A/53230A Measurements 3
When shipped from the factory the measurement time out is set to 1 second.
Specifying a time of 9.9E+37 or sending the SYSTem:SECurity:IMMediate
command disables the time out. When the time out is disabled, the instrument
will wait indefinitely for the measurement to complete.
SCPI Syntax Conventions
Programming the counters through their LAN, USB, and GPIB interface is
achieved using the Standard Commands for Programmable Instruments
(SCPI) control language. A typical example of the SCPI language syntax is
shown for the following MEASure command:
MEASure:FREQuency? [{<expected>|MINimum|MAXimum|DEFault}
[,{<resolution>|MINimum|MAXimum|DEFault}]][,<channel>]]
The programming conventions are as follows.
Command Keywords and Abbreviated Commands
Command keywords (e.g. MEASure, FREQuency?) are separated by a colon (:).
Upper case letters indicate the abbreviated spelling of the keyword or parame-
ter. Either the abbreviated form or the entire command/parameter must be
used.
Optional Keywords and Parameters
Optional (implied) keywords and parameters are indicated by square brackets
(e.g. [,<channel>]) and are not included when the command is sent. If an
optional parameter is not specified, a default value is used.
Separating Commands and Parameters and Linking SCPI Commands
A space must separate the last keyword and the first parameter. Commas (,)
separate multiple parameters. The ‘@’ symbol must precede each counter
channel number and parentheses must enclose each channel:
MEAS:FREQ:RAT? 5E6,(@2),(@1)