Anritsu MX183000A, Operation Manual, Page: 105 / 226

4.7 Jitter Tolerance Test Procedure
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If you wish to determine jitter tolerance estimate results accurately for
low rates, set Unit to Estimate.
Note:
Three or more measurement results between 1.0E–6 and 1.0E–9
cannot be obtained if the jitter amplitude reaches the Upper Limit,
and the Error Rate at this point is 1.0E–9 or less. For this reason,
jitter tolerance cannot be estimated for low rates.
Estimate curves can be drawn for intermediate measurement results
even when Unit is set to Error Rate or Error Count.
Intermediate results as shown in Figure 4.7.3-3 can be obtained for
settings as shown in Table 4.6.2-1.
Unit: Error Rate
Error Threshold: 1.0E–7
Direction Search: Binary
Figure 4.7.3-3 Example Intermediate Measurement Results for Binary,
Error Threshold 1.0E–7
In this case, 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, even without setting Unit to Estimate. BER
can therefore be estimated for low rates such as E–20.