Rockwell Automation 2090-xxx Fiber Optic Cable Installation and Handling Instructions - Manual (Page 16)

16 Fiber Optic Cable Installation and Handling Instructions
Publication 2090-IN010C-EN-P – April 2005
System Field Testing Overview
The total point to point attenuation should never exceed 12.5dB for POF
and 4dB for HCS cables. Field testing cables as installed is accomplished in
much the same manner as tests described in section 1. Field-testing requires
verification of transmitter light power output and receiver input power.
Cables may have more attenuation after installation due to bending
encountered by the installed path.
System Field Testing Verify Transmitter Output Power
Verify transmitter power as outlined below:
Figure 10 Field Testing Transmitter Output Power
1. Inspect and clean the ends of the reference cable.
2. Put the Source into Continuous light mode. High power output.
3. Turn on optometer and select appropriate wavelength.
4. Put the meter into the absolute power measurement mode(-dBm)
5. Securely connect appropriate reference cable corresponding to the
type of cable to be tested.
• POF reference cable used for testing POF cable
• HCS reference cable used for testing HCS cable
6. Read the value off the meter.
7. Verify that the power out put of the transmitter is within the range
specified in the SERCOS attenuation table.
SERCOS
Drive or
Module
Transmit
Optometer Set to
measure power in dBm
1 meter in length reference cable