Page 216 - Sensors and Control Systems in Manufacturing

Fiber Optics in Sensors and Contr ol Systems
3.17.2 Attenuators 177
The 19XT optical attenuator (Fig. 3.57) is a handheld automatic optical
attenuator. It provides continuous attenuation of both short- and long-
wave optical signals in single-mode and multimode applications.
The calibrated wavelengths are 850 nm/1300 nm multimode and/or
1300 nm/1550 nm single mode. An attenuation range of 70 dB
is offered with 0.1-dB resolution and an accuracy of ±0.2 dB typical
(±0.5 dB maximum). Unique features allow scanning between two
preset attenuation values and includes the insertion loss in the reading.
The 19XT allows simple front panel operation or external control
of attenuation through analog input and output connections.

3.17.3 Fault Finders
The Photodyne 5200 series optical fault finders (Fig. 3.58) offer flexi-
ble alternatives for localizing faults or trouble areas on any fiber-optic
network. The 5200 series fault finders can easily be integrated into the
troubleshooting routines of fiber-optic crews. They offer a variety of
features, such as:
• Fast accurate analysis of faults
• Autoranging for greatest accuracy

FIGURE 3.57
Photodyne 19XT
optical attenuator.
(Courtesy 3M
Corporation)