Chapter 5
Fiber Optics Cable Field Calibration and Testing
FIELD CALIBRATION (GENERAL)
Field calibration allows the FIBERTEK to obtain a reference level for loss measurement.
The accuracy of the field calibration depends on the amount of warm-up time allowed
prior to starting the calibration process.
Figure 5-2: Preferred Setup for Field Calibration
Note: Allow the adapter a proper warm up time prior to field calibration. This will
ensure specified accuracy. Be sure the launch cables are the same type of fiber as
the cable being tested. (i.e. 50
μ
m jumpers to test 50
μ
m cabling)
If the FIBERTEK unit has been stored in a location substantially colder than the area
where measurements are to be taken, allow the unit to warm up to the ambient
temperature with the protective dust caps in place to prevent condensation on the
transmitter or receiver diode lenses.
Thoroughly clean the laser and receiver lenses prior to attaching the launch cables
using the Fiber Cleaning package supplied with your Basic or Premium Kit, which
contains a high-quality cleaning solution and lint free wipes. Contact your local
distributor for refills.
Replace dust caps immediately after launch cables are removed.
The setup depicted on this page is the normal calibration configuration for all tests
that use both handsets. This includes Autotest as well as the Attenuation and Length
tests, which are accessed through the Analyze menu. Calibration configuration for
Loopback Attenuation is described later in this manual.
The calibration data is recorded and stored by the Display Handset. The loss effects of
launch cables and couplers that were present during field calibration are subtracted
from the attenuation results during testing.
5-3
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