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Using the Optical Spectrum Analyzer
The System Menus
To set the grating order mode
1
Press the front-panel
System
key.
2
Press the
More System Functions....
softkey.
3
Press the
Service Menu....
softkey.
4
Press the
Adv Service Functions....
softkey.
5
Press the
Grating Order
softkey.
6
Toggle between 1 and AUTO.
The Grating Order function lets you choose between 1
st
order grating only and
the Automatic setting. The Automatic mode selects 2
nd
order mode if the stop
wavelength is less than 900 nm. The 2
nd
order grating mode provides a slightly
higher measurement sensitivity. Note that the 10 nm resolution bandwidth is
not available when using the 2
nd
order grating mode. The grating order is
listed in the OSA State Information. See “To display the OSA State information
panel” on page 3-47 for more information.
To set the wavelength limit
1
Press the front-panel
System
key.
2
Press the
More System Functions....
softkey.
3
Press the
Service Menu....
softkey.
4
Press the
Adv Service Functions....
softkey.
Note
The optical spectrum analyzer compensates for temperature-related current drift
between each sweep. Although this “zeroing” increases amplitude accuracy, it increases
the time between sweeps. If amplitude accuracy is not critical to your measurement, you
can turn off zeroing. Refer to “Auto Zero” on page 3-12 for additional information.
The optical spectrum analyzer performs a more complete zeroing when the instrument is
first turned on. You can run this more complete routine anytime by pressing the
ZERO
NOW
softkey.
book.book Page 51 Monday, January 31, 2000 10:34 AM