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RM3 SERIES BACKREFLECTION METER
USER’S MANUAL
10112341 Rev 002 Page 15 of 39
Specifications
The following optical specifications describe the warranted characteristics of the unit ( Table 3).
Supplementary specifications describe the typical non-warranted performance of the unit
(Table 4).
Table 3: Optical Specifications
Specification
Parameter
Single-mode
Multimode
Operating wavelength 980, 1310, 1480, 1550,
1625, or 1650 ±10 nm
850, 1310 nm
±20 nm
Fiber Type
*
1060
for the 980 nm)
multimode
Detector type 2 mm diameter InGaAs 3 mm diameter InGaAs
Range
backreflection
power
0 to -75 dB
0 to -80 dBm
0 to –40 dB
1
3 to -60 dBm
Absolute accuracy
backreflection
power
±1.0 dB
2,3
±0.25 dBm typical at -10
dBm
5,6
±1.0 dB
4
±0.25 dBm typical at -10
dBm
6
Relative accuracy
backreflection
power
±0.4 dB
3
±0.05 dB (<5 dB loss),
±0.15 dB (>5 dB loss)
5
±0.7 dB
4
±0.15 dB (>5 dB loss)
6,7
Output connector type Panel-mounted,
low-backreflection APC
Remote interface RS232 or IEEE 488 (GPIB)
1
Reduced backreflection accuracy in the last 10dB of range based on termination effectiveness. Depending on
the measurement setup, measurements with lower levels are possible at reduced accuracy.
2
User-calibration supported.
3
For a typical application, add ±0.4 dB for readings between -60 and -67 dB. Add ±0.8 dB for readings
between -67 and -72 dB. Add ±1.5 dB for readings between -72 and -75 dB.
4
Following the user-calibration procedure at the recommended interval. For simple reflections, such as flat-end
connectors.
5
Add ±0.1 dB between -70 and -80 dBm.
6
Immediately after performing a dark measurement.
7
Add ±0.1 dB between 0 to 3 dBm and between –35 and –40 dBm.