A power meter is used to test loss, but a test source is needed as well. The meter will measure the optical power that is lost in every part of the cable. The cable is mated with a working reference cable. Two methods used in loss testing are single-ended loss and double-ended loss.
![Viavi T-BERD 5800 [TB5800-DS3-10GE] Single Port Handheld Network Tester for 1GE/10GE Ethernet, DS1, DS3](image/cache/wp/gj/Products/Viavi_TB5800-1G-10GE-200x200.webp "Viavi T-BERD 5800 [TB5800-DS3-10GE] Single Port Handheld Network Tester for 1GE/10GE Ethernet, DS1, DS3")
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![Viavi SmartClass 4800 [SC4800-GIGE-T1/E1-NOPT] Service Tester Package for 100M & 1G Optical Ethernet, 10/100/1000M Electrical Ethernet, T1 & E1, Multiple Streams, IPv4](image/cache/wp/gj/Products/Viavi%20_SmartClass-SC4800E1T1-200x200.webp "Viavi SmartClass 4800 [SC4800-GIGE-T1/E1-NOPT] Service Tester Package for 100M & 1G Optical Ethernet, 10/100/1000M Electrical Ethernet, T1 & E1, Multiple Streams, IPv4")
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![Viavi Certifier10G [NGC-500-6A-NA] Handheld Copper Cable Certifier](image/cache/wp/gj/Products/Viavi_NGC5006ANA-200x200.webp "Viavi Certifier10G [NGC-500-6A-NA] Handheld Copper Cable Certifier")
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