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Making Measurements
Measuring Signal-to-Noise Ratios
To measure signal- to- noise
1 Press the front- panel Preset key.
2 Press List by WL or List by Power.
3 Press Appl's and then S/N.
4 To select the wavelength reference for measuring the noise, do the
following steps:
a Press WL REF, and
• press AUTO to let the instrument interpolate the wavelength,
or
• press USER to select the last wavelength manually entered.
b If you chose USER, you can specify the wavelength by pressing USER
WL. Use the
the
and
c Press RETURN.
5 While the signal- to- noise measurements are displayed, you can press
PEAK anytime to select the signal with the highest power.
2-28
softkey to select the digit that requires editing. Use
softkeys to change the value.
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