Anritsu BERTWave MP2100B, Operation Manual, Page: 171 / 382

6.3 Setting Conditions for Error Detection
6-11
6
Measuring Bit Error
Select the signal input terminal depending on the Data Input Condition
[Differential 50 Ohm]: Signal input terminal for both Data In and
Data
In connectors. The differential voltage of each
signal input to two connectors is the input voltage.
[Electrical Single-Ended Data]:
Signal input terminal for Data In connector
[Electrical Single-Ended XData]:
Signal input terminal for
Data
In connector
Attenuator Factor (External Attenuation)
When installing the fixed attenuator in the Data In and
Data
In
connectors of the BERTWave, input the attenuation (dB) of the fixed
attenuator.
The threshold voltage calculated to the input voltage of the attenuator is
displayed.
The calculation formula is as follows:
Calculated Threshold Voltage = Threshold Voltage × 10^(attenuation/20)
Threshold Level
Voltage level for evaluating “1” and “0”.
The input terminals are AC coupled, so set a voltage corresponding to the
signal waveform excluding the DC components.
The following figure shows the waveform input to the connector and the
waveform excluding DC components when the input signal level is
LVPECL.
0
1
2
-1
Voltage (V)
Waveform input to Data In connector
0
1
2
-1
Voltage (V)
Threshold level
Time Time
Waveform without DC components
Figure 6.3-2 Eye Pattern Monitoring