Trace Subsystem VNA Commands
3-154 PN: 10580-00306 Rev. E MS20xxC PM
Trace Header Transfer
:TRACe:PREamble?
Description: Returns trace header information for the specified trace. Data can be
transferred from the 4 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 appears in the format
#AX, where A is the number of digits in X, and X is the number of
bytes that follow the header. Refer to the following section, “Example
Response Format:”.
Parameters are returned in comma-delimited ASCII format. Each
parameter is returned as “NAME=VALUE[UNITS]”. Note that the
parameters that are returned depend on the firmware version and that
this document does not cover all parameter values that are returned by
the command.
Syntax: :TRACe:PREamble? [1]|2|3|4
Cmd Parameter: NA (query only)
Query Response: <block> (returns block data)
Front Panel
Access: NA
Example Response Format:
#AX is #40078, where A = 4 (the number of digits in number X), and X = 0078 (the
response has 78 characters).
#40078SN=6897458,TYPE=DATA,DATE=2009-03-18-03-13-20-00,INT_BIAS_TEE_
CURRENT=0.000000
Parameters are returned in comma-delimited ASCII format. Each parameter is returned as
“NAME=VALUE[UNITS]”. For the example response, the serial number (SN) is 6897458 and
is returned as “SN=6897458”.
The following 3 tables describe parameters that can be returned by the :TRACe:PREamble?
command:
• Table 3-12, “Trace Header Parameters” on page 3-155
• Table 3-13, “Trace Header Marker Parameters” on page 3-164
• Table 3-14, “Trace Header Limits Parameters” on page 3-165
Note
The parameters that are returned depend on the firmware version in the MS20xxC,
and this document does not cover all possible parameter values that can be
returned by the command.
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