Tektronix TekRanger 2 TFS3031, Руководство по обслуживанию

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Specifications – TekRanger (serial nos. below B052000)
1–40
TFS3031 TekRanger/TekRanger 2 Service Manual
Table 1–43: Vertical System Dynamic Range (Extended Range 1310 nm Singlemode, Option 08)
Characteristic Performance Requirement Supplemental Information
Dynamic Range
Pulsewidth
2000
1000 m
500 m
100 m
50 m
20 m
10 m
5 m
1 m
SNR=1 Typical
30 dB 32 dB
28 dB
25 dB 28 dB
19.5 dB
18 dB
15 dB
13.5 dB
12 dB
7.5 dB
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.
Measured using a 4 km test fiber
(Corning SMFĆ28, 8.5 m m core,
0.12 NA) after 3 minutes of
averaging.
A 0.5 dB front panel loss is
assumed.
Temperature Coefficient of
Dynamic Range -0.15 dB/
o
C for T 25
o
C