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Function Reference
Span
Span
Defines the wavelength measurement range for viewing the spectrum.
The span is set symmetrically about the center wavelength. The resolution of
the wavelength readout decreases with an increase in the span setting. When
the span is set to 0, the display's horizontal axis represents time instead of
wavelength. A span of 0 (called zero span mode) configures the analyzer as a
fixed tuned receiver.
N o t e
Zero span mode requires that sensitivity be in Auto mode.
The wavelength measurement range can also be set using the Start WL and
Stop WL functions.
N o t e
If you increase the span around a center wavelength beyond one of the end
wavelength limits of the TLS, the center wavelength will change to a value that
will allow the span to increase. For example, if the center wavelength is set to
1553 nm and you increase the span to 100 nm, the center wavelength changes
to 1532 nm in order to be able to accommodate the 100 nm span.
See "Measuring the response of a filter" on page 3-18.
Key Path
Wavelength > Span
Related Functions
Start WL, Stop WL, Center WL
Remote
SENSe:WAVelength:SPAN
Commands
Start WL
Sets the start wavelength. The center wavelength and span are adjusted so
that:
Start
Use the knob, step keys, or numeric keys to enter the desired value.
If the instrument is in zero span, this command sets the center wavelength to
the value specified.
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Span
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Center
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