Test I. Dynamic Range D Single-Mode/Multimode Module Performance Tests
E6000C Mini-OTDR User’s Guide, E0302
229
14 Position marker B at Bpos km. View the trace around
marker B and zoom the trace around marker B to 2 km/
Div and 1 dB/Div.
The value for Bpos is given in Table 2, Table 3, or Table
4, depending on the module you use.
U
P (A/B) until only B is highlighted. Use LEFT/RIGHT
keys
→ Bpos km. Use DOWN (Around B) to get better
resolution.
{<==> Z
OOM} → 2 km/Div
{Z
OOM} → 1dB/Div.
Note results in test record 15 Note the value of the sample spacing, “Samp.Dist.”.
Calculate the number of peak samples (dots) from the
viewed distance V divided by the sample spacing.
Calculate 2% thereof.
To get 98% Noise Level disregard 2% of the largest noise
peaks samples (dots).
Example: PW = 10
µs → V = 50km, sample spacing =
10.28 m.
→ number of peak samples = 50 km / 10.28 m = 4863
→ 2% thereof = 97.
16 Check the calculated 2% of the highest peak samples
within the viewed distance V: that is from Bpos to Vend
according to the values given in Table 2, Table 3, or
Table 4.
NOTE To check out and disregard the 2% of the highest peak
samples you need to zoom in further to get dots.You may
have to change the color of the trace to view them more
clearly.
Reposition marker B 17 Position marker B at a point on the trace that equals
the 98% Noise Level
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