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Programming Commands
SENSe Subsystem
Query Response
The query form returns the current offset setting as shown in the following
example:
+5.00000000E+000
DATA?
Queries the time domain samples of the input laser line.
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 func-
tion. Refer to “Measurement Instructions” on page 5-15.
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).
Amplitude 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 wavelength, 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 approxi-
mately, but not exactly, located in the center of the time domain data.
If your program is aborted or interrupted after sending this query, the
Agilent 86120B continues to process the data but does not place it in the out-
put 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.