YOKOGAWA AQ7260 OTDR, Руководство пользователя, Страница: 128 / 442

Chapter 3 PERFORMING MEASUREMENTS
3-21
2.
Press [ENTER].
A selection window will appear.
•
If the trace is saturated, measurement cannot be performed with high sensitivity.
•
The attenuations that can be selected vary with the optical module, wavelength
and pulse width selected. The table below shows the attenuations that can be
selected in the case of AQ7264 optical module and wavelength 1.55µm.
3.
Locate the cursor to “10.00dB” by using the rotary knob or [
S
] / [
T
].
4.
Press [ENTER] to register the change made to the attenuation setting.
5.
Press [F4] (DONE) to register the changes made to the measurement
conditions.
•
When changing the condition for two or more items, it is recommended to change
the condition for each item first and then press [F4].
Refer to the notes given on changing the measurement conditions (page 3-50).
Smaller
Larger
TIP
Refer
TIP
Pulse width
10ns
20ns
50ns
100ns
200ns
500ns
1µs
4µs
10µs
20µs
50µs
Selectable
attenuations
0.00dB
to
16.25dB
(1.25dB step)
0.00dB
to
20.00dB
(1.25dB step)
0.00dB
to
23.75dB
(1.25dB step)
0.00dB
to
26.25dB
(1.25dB step)