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3-3
Using the Optical Spectrum Analyzer
Front-Panel Keys
Front-Panel Keys
The optical spectrum analyzer has front-panel keys that perform a function
when pressed.
For maximum amplitude accuracy, perform the automatic alignment when-
ever the optical spectrum analyzer has been moved, subjected to large tem-
perature changes, or following warm-up. This function can also be accessed by
choosing the Measure menu Auto Align selection on the menu bar.
Pressing the
Auto Align
button on the front panel of the OSA performs an auto-
matic alignment of the instrument using the largest signal found in a full span
sweep. This aligns the output of the monochromator with the photodetector
for improved amplitude accuracy. You should use the Auto Align function
whenever the OSA is bumped or physically moved to a new location.
The automatic alignment requires the connection of an external light source.
This can be a broadband or narrowband source. If there is insufficient signal
power, the automatic alignment will not be performed, and an error message
will be reported.
The Auto Align function saves and restores the current instrument state. This
allows the Auto Align function to be used in the middle of a measurement rou-
tine.
If markers are turned on, the Auto Align function attempts to do the automatic
alignment at the wavelength of the active marker. If the instrument is in zero
span, the alignment is performed at the center wavelength.
To perform an Auto Align function from the remote interface, see the descrip-
tions of the following remote commands:
“CALibration:ALIGn” on page 4-68
“CALibration:ALIGn:MARKer[1|2|3|4]” on page 4-68
book.book Page 3 Monday, January 31, 2000 10:34 AM