EXFO FTB-3930 MultiTest - Manual (Page 63)

Multifunction Loss Tester 57
9 Using a Light Source
Your unit may contain two source ports: a 2- or 3-wavelength singlemode
port and a 2-wavelength multimode port, depending on the configuration.
The source signal can be continuous (CW or high-power) or modulated
(270 Hz, 1 kHz or 2 kHz) and uses the F
AS
T
ES
T ports.

CW signal (the default): constant power over the temperature range,
but about 3 dB lower than maximum.

High-power signal: reaches maximum power, but its power slightly
varies over the temperature range.

If you switch to power meter or ORL meter, a Source status pane is
always displayed.

When you switch sources, the modulation remains the same. It is
indicated in the data display.

Only one source/wavelength may be active at a time. The active port
(SM or MM) is indicated in the data display.

The source status is indicated with a LED in the status bar and on the
platform front panel.
Note: The platform front panel always shows the source, VFL, ORL meter or talk
set port status (even when you use other applications).
W
ARNING
When a source is active, its port emits invisible laser radiation.
Avoid exposure and do not stare directly into the beam. Ensure that
any unused port is properly protected with a cap.
FT
B
-3
930
MU
LT
IT
ES
T
Source singlemode (SM) and
multimode (MM) ports