R&S AFQ100A Operating Manual page 192

R&S AFQ100A
Example:
50 bits were set to "0" by the DUT. These 50 bits plus the preceding "0" are ignored in the bit error rate
measurement.
PRBS at Generator
PRBS at DUT Output
BER "active"
Threshold
Impedance
1401.3084.32
Bit Error Rate Measurements - BERT Block
Drop Out of DUT
50 Bits
These bits are ingored
Pattern Ignore is not active.
Off
Remote-control command:
BERT:SET:IGN OFF
Bit sequences consisting of 32 or more
All 1
consecutive "1" data are not used (i.e. ignored) for
the BER measurement.
Remote-control command:
BERT:SET:IGN ONE
Bit sequences consisting of 32 or more
All 0
consecutive "0" data are not used (i.e. ignored) for
the BER measurement.
Remote-control command:
BERT:SET:IGN ZERO
Sets high/low threshold in volts for the BERT inputs Clock, Data, Data
Enable and Restart.
The variable threshold makes it possible to align the BERT interface
with the level of different input signals. In addition, reflections and
other interference can be suppressed by selecting the appropriate
threshold.
Remote-control command:
SOUR:INP:BERT:THR 1.0
Sets the input impedance of the BERT inputs Clock, Data, Data
Enable and Restart.
For high clock rates, 50 ohms should be selected.
Remote-control command:
SOUR:INP:BERT:IMP G50
4.81 E-3