Multifunction Loss Tester 59
10 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
(see Technical Specifications on page 93).
The source signal can be continuous (CW or high-power) or modulated
(270 Hz, 1 kHz or 2 kHz) and uses the F
ASTEST 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.
A special Auto ID signal can transmit its wavelength value, to facilitate
wavelength detection by a compatible unit.
The Power Meter pane remains displayed
when you use the source.
If you switch to power meter or VFL while a
source is active, the Source pane remains
displayed.
When you switch sources, the modulation
remains the same. It is indicated in the Source pane.
WARNING
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.
Source singlemode (SM) and
multimode (MM) ports
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