148 Chapter 7
Controlling the OBR Remotely
commands. If the Integration Width (or Sensing Range)
is set to 0, then the Y-axis data is returned for the entire
measurement area.
This query is usually preceded by the FETC:FSIZ? query
to determine the number of data points that will be returned.
All parameters must be specified.
Response: Returns a series of numbers representing the Y-axis data
points for the requested area.
The data are returned as an array with each element in
floating point format with ten
significant
digits and possible
exponent field of the form [?]d.ddddddddd[e[?]ddd].
If space needs to be allocated for the receiving buffer, the
amount required for each element is 18, including a carriage
return as the delimiter.
The number of points is the same as the value obtained by
sending the FETC:FSIZ? request with the same parameters.
The string "///" is
returned
after the last data point to indicate
that the response is complete.
If a successful scan has not been made before this query,
the OBR responds with “Trace A (B, etc.) contains no data.”
Example: FETC:MEAS? C, 1, 3,
1
Retrieves the Y-axis data for Trace C’s frequency domain
phase derivative data, with decimation on.
-101.101531
-102.912509
-99.7946707
...
-102.621305
-72.7263532
///
FETCh:XAXIs?
Usage: FETC:XAXI? {trace, domain, units, decimate}
Trace is specified as a single letter: A, B, C, D or E.
Domain can be set to 0 for time domain, or 1 for frequency
domain.
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