54
OLT-85/OLT-85P
8 S
OURCE
O
PERATION
S
ELECTING
A
MODULATION
OR
A
UTO
-
L
MODE
Wavelengths cannot be reliably detected in following situations:
• The receive level is too low.
• The wavelength encoding cannot be detected due to
interference.
• You are measuring the absolute level of a system that does not
have wavelength encoding matching Viavi power sources.
Selecting a modulation or Auto-
mode
Modulation or Auto-
mode can be selected by the mode
button or via the menu. Both ways are described
Enabling modulation and selecting a frequency
Using the
[
Mode selection
]
button:
NOTE:
A modulation frequency can only be selected when just one
wavelength is selected.
1.
When two wavelengths are selected first tap one of the
wavelengths to deselect it.
2.
Tap the
[
Mode selection
]
button to toggle between the
modulation frequencies (and the Auto-
mode):
>
>
>
>
>
> ...
Using the menu:
J
Press the
[
A
]
key, tap the
[
Modulation
]
button and tap the
desired frequency.
The measurement display is shown and the selected frequency
is enabled. If Auto-
was active before, the mode is set to
modulation now.
Enabling Auto-
Using the
[
Mode selection
]
button:
I
A modulation frequency is selected.
J
Tap the
[
Mode selection
]
button until Auto-
is displayed.
Auto-
is enabled now for the selected wavelengths.
Using the menu:
I
A modulation frequency is selected.
J
Press the
[
A
]
key, tap the
[
Auto
button and tap
[
Serial-
.