Anritsu BERTWave Series, Руководство по эксплуатации, Страница: 407 / 466

A.2 BERT
A-11
A
ppe
ndi
x A
Table A.2.3-1 ED (Cont’d)
Item Specifications
External ATT factor 0 to 30 dB*
5
, 1 dB resolution
Test Pattern PRBS: 2^7–1, 2^9–1, 2^15–1, 2^23–1, 2^31–1
Logic invertible
Measurement
Alarm Detection Sync loss*
6
Bit Error Detection Total Error Rate: 0.0001E–18 to 1.0000E–03
Total Error Count: 0 to 9999999, 1.0000E07 to 9.9999E17
Recovered Clock
Detection
Able to detect the input signal frequency (sampling system).
History Sync loss, Bit error (able to reset the history indicator)
Gate settings
Gating Unit 1 seconds to 9 days 23 hours 59 minutes 59 seconds
Cycle Single / Repeat / Untimed
Current Able to switch On or Off. (When it is Off, the result is updated after set time
is passed)
Result Time Start Time, Elapsed Time, Remaining Time
Progress Bar Displays the measurement progress in a bar graph and percent figures.
PPG/ED Tracking Test Pattern
*5: The thresholds corrected by the external attenuation factor are
displayed. The formulas are shown below:
Upper limit value =
)
20
ATT
(
10 × 85 -
Lower limit value =
)
20
ATT
(
10 × 85
Resolution =
)
20
ATT
(
10 × 1.0
*6: It is not synchronizing with Test Pattern.