Viavi BN 2301/01, Руководство пользователя

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Chapter 1 Optical Spectrum Measurement
Result display
24 MTS / T-BERD 5800 • COSA-4055 • User Manual 2016.01
To zoom the y-axis:
Zooming the y-axis is independent from the cursor settings.
1. Press the Zoom/Shift softkey and select Zoom .
2. Press the or

key to reduce or enlarge the y-axis.
The Shift
function
The shift functions moves the trace and keeps the cursor on this
positions. Shifting the trace is independent from the cursor settings.
To shift the trace:
1.
Press the Zoom/Shift softkey and select Shift .
2. To shift the trace left or right: press the or

key.
3. To shift the trace up or down: press the or

key.
The
measurement
function
By setting both cursors two values can be measured:
–
Difference Power (A-B) : the difference power between the two
cursor positions
– Total Power : the total power between the two cursor positions
– Delta power : slope and difference power between the first and the
last detected channel within the area marked by the cursors.
To measure the Difference Power:

Set the cursors to the desired positions.
The difference power is displayed in the trace result field above the
diagram (
A-B ).
To measure the Total Power:
1.
Set the cursors at the desired positions.
2. Press the softkeys Advanced , Measure A<->B and
Total Power A<->B .
The space between the trace and the two cursors is greyed out and
the power is displayed.