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
1–85
Table 1–107: Vertical System Dynamic Range (Extended Range 1310/1550 nm Singlemode, Option 10)
Characteristic Performance Requirement Supplemental Information
Dynamic Range
Pulsewidth
3200 m
2000 m
1000 m
500 m
200 m
100 m
50 m
20 m
10 m
5 m
1 m
Typical
32 dB 35 dB (1310)
33.5 dB (1550)
34 dB
32.5 dB
25 dB 30 dB
29 dB
27.5 dB
23 dB
14 dB 15 dB
19.5 dB
18 dB
14.5 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.
Based on high APD and amplifier
gains. Low APD gain reduces 4
dB. Low amplifier gain reduces 5
dB.
3Ćminute of average
0.5ĆdB frontĆpanel loss assumed.
For 100, 200, 500, 1000, 2000, and
3200Ćm pulse widths, fiber must
have enough loss so the second
segment is taken with high system
gain.
For 3200Ćm pulse width, maximum
dynamic range is limited to 36.5
dB.
Clipping may be observed for up to
20 km with 2000Ć and 3200Ćm
pulse widths with dynamic range of
3200Ćm pulse width 35 dB.
Temperature Coefficient of
Dynamic Range -0.15 dB/
o
C for T 25
o
C, typical