46
ORL-85/ORL-85P
7 P
OWERMETER
O
PERATION
S
ETTING
AND
SELECTING
WAVELENGTHS
Enabling Auto-
λ
mode
Auto
λ
is a special feature developed by Viavi that allows you to
identify wavelengths automatically (from OLS-XX, MTS-2k/4k/6k
OTDR CW-source). To do this, the signal is modulated at a
certain frequency (by a light source equipped with Auto
λ
, such
as a Viavi OLS-85), which can be detected by a Viavi ORL-85.
In Auto
λ
mode the detected wavelength will be included in the
λ
table. As long as the detected wavelength is active, it cannot be
deleted from the
λ
table.
Wavelengths cannot be reliably detected if:
• the receive level is too low,
• 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.
To switch Auto
λ
mode on/off:
I
The instrument is in
Powermeter
mode.
1.
Press the
[
A
]
key and tap the
[
More
]
button.
The menu opens:
2.
Tap the
[
Auto
λ
]
button to switch Auto
λ
mode on/off.
The checkmark is set or removed.
Displaying modulated signals
The ORL-85/ORL-85P automatically detects the modulation
frequency of light signals modulated at the fixed frequencies of
270 Hz, 1 kHz, and 2 kHz. The detected frequency is shown in
the lower right measurement display pane.
