Anritsu MX183000A, Руководство по эксплуатации, Страница: 104 / 226

Chapter 4 Operation
4-50
Mod.Amplitude[UIp-p]
Log(Ln(BER))
1E-5
1E-10
1E-n



















 −
=







 −
−
2 π
σ
D μ
e
2
1
BER(D)
2
σ
D μ
2
Figure 4.7.3-1 Noise Distribution Estimate and BER Estimate Calculation
The MX183000A allows an estimate curve to be plotted if three or more
measurement results have an error rate between 1.0E–6 and 1.0E–9
while measuring Jitter Tolerance.
Intermediate results as shown in Figure 4.7.3-2 can be obtained for
settings as shown in Table 4.6.2-1.
Unit: Estimate
Direction Search: Upwards Linear
Figure 4.7.3-2 Example Intermediate Measurement Results for
Upwards Linear (Unit Setting: Estimate)
As there are at least three measurement results with an error rate
between 1.0E–6 and 1.0E–9, the approximation line shown in Figure
4.7.3-1 can be drawn, allowing estimation of BER for low rates such as
E–20.
If Unit is Estimate, even if there are less than three measurement
results with an error rate between 1.0E–6 and 1.0E–9, measurement is
continued until there are three measurement results with an error rate
between 1.0E–6 and 1.0E–9 by measuring with additional SJ values.