M-UM008-01 Page 2
The DLS 350 is calibrated to have an output power level of -22dBm. Variations in power
level between -22dBm and -25dBm may be normal depending on the quality and age of
the test jumper, the DLS 350 output port, and other factors.
Always ensure the DLS 350 is transmitting an acceptable power level before performing
an insertion loss test. Simply insert the test jumper (plugged into the DLS 350) into a
companion power meter set to the dBm mode. The power meter will indicate the measured
output power of the LED.
Transmitting Light
The DLS 350 transmits either the 850nm or 1300nm wavelength on singlemode fiber. Be
sure to use a test jumper to mate the DLS 350 to the fiber under test.
Test Jumper
Mate Connectors Appropriately
Signal Propagates Down Fiber
Caution: Invisible LED Radiation
Please note that 850nm and 1300nm wavelengths are not visible to the human eye. Do not
look directly into the output port of the DLS 350 or directly into any fiber connector that
may be live.
Since the LED is invisible to the eye, the eye’s natural blink reflex is suppressed. This can
cause damage to the retina.
FDA 21 CFR 1040.10 and 1040.11
IEC 60825-1: 2007-03
Class 1 LED Product
Output Power
Test Jumper Plugged
Into Power Meter
Power Meter Displays
Output Power of LED
