Industrial Fiber Optics IF-FOM, Руководство оператора

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LED
The receptacle in the lower right corner of the front panel contains the LED optical light
source used to launch energy into fi ber optic cables. The LED operates at a wavelength
of 660 nm with a nominal optical power of 0.25 mW. The receptacle is a female “ST
® ”
bayonet style fi ber optic connector, which also accepts the ST ® male plug used with
plastic jacketed fi ber optic cables. Un-connectorized cables may also be inserted into this
receptacle for measurements. As with the Detector, the plastic cap over the ST receptacle
protects the internal LED from damage and dust. The cap must be removed prior to
measurement and replaced when the test set is not in use.
Batteries
The Fiber Optic Test Set requires two 9-volt batteries (included) for operation. For shipping
and storage purposes they have not been installed at the factory. To install or replace the
batteries, follow the procedure in the section titled SERVICE AND MAINTENANCE.
Battery types suggested for use with this test set include standard, heavy duty, and alkaline
9-volt batteries. Part numbers from major manufacturers are shown in Table 2.
Note: The
use of nickel-cadmium (NiCd) batteries is not recommended because their lower cell
voltages may produce inaccurate readings.
Test Cable
A connectorized fi ber optic cable approximately one meter long is provided with the test
set. Using the cable, a “self-test” procedure can be performed to verify proper instrument
operation before making measurements. The cable is tested at the factory prior to shipment
and a calibration value is supplied with the test set documentation. An adjustment
procedure using this value compensates for aging of the built-in LED source.
The cable is
not intended for use as a patch cord and must be protected from damage to preserve its
calibration value.
Table 2. Part numbers for popular batteries suitable for
the Fiber Optic Test Set
Manufac-
turer
Standard Heavy Duty Alkaline
Duracell © Not available M9V MN1604
Eveready © 216 1222 522VP
Ray-o-Vac © 1604 D1604 A1604