EXFO EPM-500 Power Meter - Manual (Page 22)

Using a Light Source (ELS-500 and EOT-500) or VFL 17
Modulating the Source Signal
When you activate the first source (after turning on the unit), the signal is always
CW (unmodulated). When you switch sources, the modulation remains the same
(VFL remembers its own modulation). Modulation is indicated in the top left
(port #1) or top right (port #2) corner.
Available modulation values are: CW, Auto, auto-switching mode, 270 Hz, 1 kHz and
2 kHz (VFL: CW and 1 Hz only).
Note: Auto is a modulated signal detected by compatible units (see
Automatically Detecting Wavelength on page 14). It provides greater
autonomy than CW, but covers a reduced power range.
Note: Auto-switching mode is a special signal detected by compatible units
(see Using Auto-Switching Mode on page 17).
To change the signal modulation:
1. Activate the source.
2. Press
to switch between available
modulations.
Using Auto-Switching Mode
In auto-switching mode, your source automatically
switches from one wavelength to another. The power
meter connected to this source displays the power
value for each wavelength one at a time. The
wavelength value appearing on the display changes
every two seconds.
To activate auto-switching mode:
1. Press
to activate the source.
2. Press to switch between available modulations until the Auto indicator
blinks on your display.