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RM3 SERIES BACKREFLECTION METER
USER’S MANUAL
Rear Panel
The back of the meter (Figure 4) can vary with the model.
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25 VA max Fuse 1A/250V
Figure 4: Back of the Meter
The components on the rear panel are described in Table 6.
Table 6: Rear Panel Components
Component | Function |
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CAL | Access to the User CAL value, for calibration purposes. |
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LOG | Foot pedal jack for data logging. |
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RS232C | RS232 serial interface port. |
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Termination Techniques
Termination is a technique used to block all backreflections beyond a certain point in a network of components. In all measurement testing, two terminations must be made: the first (for measuring BR0) is made before the DUT, for example, on the RM meter side; the second (for measuring BRtot) is made after the DUT. Both termination points need to be made as close as possible to the DUT to minimize the errors associated with Rayleigh backscattering in the fiber. The backreflection of all components and connections between these two points is included in the equation for calculating the backreflection value (BR) of the DUTs.
Termination Techniques for Single-mode Fiber (except 980 nm)
Termination for
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