FX8x Series User Manual
Page 14 of 50
6.0 Optical Power Measurement
This mode is available for FX82, FX84, FX85, and for FX87 as an option. The screenshots
shown below are from FX82. The other devices are equipped with a Light Source controlled by
the
|F2|
button which shows as
LASER
on their screens. The Broadband OPM is an InGaAs
detector with a wavelength range from 850 to 1650nm. The displayed power readings can be
absolute (dBm and watts) or relative (dB).
PM (PM1, PM2, PM3):
use the OPM test mode to measure any incoming optical signal level
(CW, 270, 330, 1000, or 2000 Hz) between the wavelength range of 850-1650 nm. Select a
calibrated wavelength that matches the incoming source wavelength.
For best results, wait 15 minutes after the device is powered ON. This is
especially advisable in environments with extreme temperature changes.
6.1 Setting ZERO Level
The ZERO level MUST be set before first using the test unit for optical
power measurements. It is strongly advised to set the ZERO level BEFORE
every new batch of measurements and AFTER measurement conditions have
changed.
To set the ZERO level:
1. Press the
|MODE|
button until the
PM1
or
PM2
test mode appears at the upper left corner of the
display, then press
|F3| (MORE)
. Make sure dust cap is closed.
PM Test Mode
