Wilcom T319 T355 Optical Level Meter Transmitter Set w/ Case AC Adapter

Wilcom T319 T355 Optical Level Meter Transmitter Set w/ Case AC Adapter

The Wilcom T319 Optical Level Meter and T355 Optical Transmitter form a matched two-instrument set for fiber optic cable testing. The T355 transmitter injects a stable optical signal into a fiber, while the T319 meter measures the received optical power level, allowing technicians to calculate insertion loss and verify cable plant performance. Both units are handheld and battery-powered (or AC-adapter-powered), housed in rugged gray aluminum-body enclosures and designed for field use. Made in Laconia, NH by Wilcom Products, Inc., these are early-1990s-era instruments from a time when fiber optic test equipment of this type was standard kit for telephone company outside plant technicians.

Specifications & What's Included

• Wilcom T319 Optical Level Meter (date code: May 1991)
• Wilcom T355 Optical Transmitter (date code: May 1992)
• Gray hard-shell Wilcom carrying case with custom foam inserts
• AC adapter (included — units power on via AC adapter)
• Accessories visible in photos included (connectors, adapters, probes)
• Manufacturer: Wilcom Products, Inc., Laconia, NH — Made in USA
• Power source: Internal rechargeable battery (dead — needs replacement) or AC adapter
• Front-panel controls: ON/OFF toggle, ADJUST knob, LO BATT and BATT CHG indicator lamps
• Display: LCD power level readout on T319
• Form factor: Handheld / portable

Applications

The Wilcom T319/T355 set is a fiber optic loss test set — the standard type of instrument used by telephone companies, CATV technicians, and fiber network contractors to characterize fiber optic cable runs. The transmitter injects a known optical signal at a specific wavelength into one end of a fiber, and the power meter at the far end measures what comes out; the difference is the insertion loss in dB. This type of two-ended optical loss test is essential for certifying newly installed fiber, troubleshooting degraded links, and documenting as-built cable plant performance. Wilcom Products was a well-regarded U.S. maker of outside plant test equipment for the telephone industry, and instruments like this T319/T355 set were widely used by Regional Bell Operating Companies (RBOCs) and independent telcos during the 1980s and 1990s as fiber was being deployed in the local loop and feeder plant. Today these sets are still useful for maintaining legacy fiber infrastructure or for technicians who need a simple, no-frills analog-style optical loss test set.