Tektronix TekRanger 2 TFS3031, Руководство по обслуживанию

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Specifications – TekRanger 2 (serial nos. B052000 and above)
TFS3031 TekRanger/TekRanger 2 Service Manual
1–73
Table 1–89: Vertical System Dynamic Range (Standard 1310 nm Singlemode, Options 04 and 06)
Characteristic Performance Requirement Supplemental Information
Dynamic Range
Pulsewidth
2000 m
1000 m
500 m
200 m
100 m
50 m
20 m
10 m
5 m
1 m
SNR=1 Typical
26 dB 30 dB
28.5 dB
23 dB 26 dB
24 dB
22.5 dB
21 dB
11 dB 14 dB
12.5 dB
11 dB
7.5 dB
SNR=1. Dynamic range SNR=1 is
defined as the difference between
the extrapolated backscatter level
at the start of the fiber and the
RMS noise level.
Measured using a 4Ćkm test fiber
(Corning SMFĆ28, 8.5 m m core,
0.12 NA) after 3 minutes of
averaging.
Based on high APD and amplifier
gains. Low APD gain reduces 4
dB. Low amplifier gain reduces 5
dB.
A 0.5ĆdB front panel loss is
assumed.
For 100, 200, 500, 100, and
2000Ćm pulse widths, fiber must
have enough loss so the second
segment is taken with high system
gain.
Temperature Coefficient of
Dynamic Range -0.15 dB/
o
C for T 25
o
C, typical.