4-11 :TRACe Subsystem Spectrum Analyzer Commands
4-38 PN: 10580-00319 Rev. N S412E PM
:TRACe:PREamble? {1|2|3}
Title: Trace Header Transfer
Description: Returns trace header information for the specified trace. Data can be
transferred to and from the 3 available display traces. Use the
commands in the MMEMory subsystem to store and recall traces from
the instrument memory. The response begins with an ASCII header.
The header specifies the number of following bytes. It looks like #AX,
where A is the number of digits in X and X is the number of bytes that
follow the header. Parameters are returned in comma-delimited ASCII
format. Each parameter is returned as “NAME=VALUE[ UNITS],” Note
that the parameters returns depend on the firmware version and that
this document does not cover all parameter values returned by the
command. Refer to Table 4-1 for valid parameter names.
Parameter: [1]|2|3
Range: 1|2|3
Trace Header Parameters
Table 4-1 describes parameters that can be returned by the :TRACe:PREamble? command.
Table 4-1. Available Parameters in Spectrum Analyzer Mode (Sheet 1 of 5)
Parameter Name Description
SN Instrument serial #
UNIT_NAME Instrument name
DESCR Trace name
DATE Trace date/time
BASE_VER Base FW version
APP_NAME Application name
APP_VER Application FW version
UNITS Amplitude units
CENTER_FREQ Center frequency
SPAN Frequency span
FREQ_STEP Frequency step size
FREQUENCY_OFFSET Frequency Offset
OFFSET_STEP_SIZE Offset Step Size
OFFSET_CENTER_FREQ Center Frequency with Frequency Offset
OFFSET_START_FREQ Start Frequency with Frequency Offset
OFFSET_STOP_FREQ Stop Frequency with Frequency Offset
RBW Resolution bandwidth
RBW_TYPE RBW coupling auto/manual
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