Keysight Technologies 86120B, User Manual

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205
Programming Commands
SENSe Subsystem
Syntax
:SENSe:DATA?
Attribute Summary Preset State: none
SCPI Compliance: instrument specific
Query Only
Description Be prepared to process a large amount of data when this query is sent. The amount
of data returned depends on the measurement update state of the instrument which is
set using the resolution argument of an instrument function.
Refer to “Measurement
Instructions” on page 146 .
When NORMAL measurement update is specified, over 2,200 kilobytes of data
(128K values) can be returned to the computer. When FAST measurement update is
specified, over 250 kilobytes of data (16K values) can be returned.
The floating point values are scaled from 1.000 to 1.999 (1 + 1023/1024). Ampli-
tude values are not calibrated.
The input laser line(s) generate an interference pattern on the photodetector as a
function of the Michelson interferometer optical path delay. The time domain data is
sampled at uniform optical path delay increments of half the reference laser wave-
length, or 0.316495 microns. When
NORMAL measurement update is selected, the
first data value is sampled at –20.74 mm optical path delay, and the last value is
sampled at +20.74 mm optical path delay. When FAST measurement update is
selected, the first data value is sampled at +2.59 mm optical path delay, and the last
value is sampled at –2.59 mm optical path delay. The data value that corresponds to
zero optical path delay is approximately, but not exactly, located in the center of the
time domain data.
If your program is aborted or interrupted after sending this query, the
Keysight 86120B continues to process the data but does not place it in the output
buffer. Because of the amount of data processed, the instrument will not respond to
any new commands in its input buffer for 30 or 40 seconds.