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Mandrels for Multimode Transmit Reference Cables
When testing multimode links using an overfilled LED source, always wrap the transmit
reference cable five (5) times around the proper diameter mandrel. This is specified by
TIA/EIA-568-B and improves insertion loss measurement repeatability and accuracy. Do NOT
use mandrels on multimode receive reference cables or singlemode reference cables.
Available mandrels for test
reference cables with 3 mm jackets
Diameter (D)
for other jacket
diameters (in mm)
Multimode Transmit
Jumper
(5) Wraps
Mandrel
D
Fiber Type Part Number
62.5 μm Contact Extron D = 20 mm minus
jacket diameter
50 μm Contact Extron D = 25 mm minus
jacket diameter
Kit with both
mandrels
Contact Extron
Loops for Singlemode Transmit Reference Cables
For TIA testing of singlemode links, the transmit reference cable must have a 1.2 inch
(30 mm) loop secured by tape, hook and loop fasteners, or other means. Do not pull the
fastener too tight.
FLS 101
Transmit
Reference Cable
1.2 inch (30 mm)
Diameter Loop
Secure
Loop Here
Fiber Optic Test Meters • Maintenance 19