3-9
Using the Optical Spectrum Analyzer
The Amplitude Menus
Using the Amplitude functions
To change the reference level
1
Press the front-panel
Amplitude
key.
2
Press the
Reference Level
softkey.
3
Use the knob, step keys or numeric entry pad to enter the desired value.
The reference level value is the amplitude level shown at the reference level
position. The reference level position is indicated on the display by a green
line and the
REF
annotation on the display. The default position is one major
graticule division from the top of the display. For the right vertical scale, the
default position is midscreen. The reference level can be specified in dBm or
watts.
To change the value of the vertical amplitude scale
1
Press the front-panel
Amplitude
key.
2
Press the
Scale/Div
softkey.
3
Use the knob, step keys or numeric entry pad to enter the desired value.
Note
When using the step keys, the increment and decrement values are determined by the
settings of the Scale/Division function. See “To change the value of the vertical ampli-
tude scale” for more information.
Note
If both the left and right vertical scales are displayed, the reference level of the active
trace is adjusted.
Note
This function determines the amount the value increases or decreases when using the
arrow keys to set the reference level. See “To change the reference level” for more
information.
book.book Page 9 Monday, January 31, 2000 10:34 AM
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