Instrument Function
R&S
®
SMU200A
185Operating Manual 1007.9845.32 ─ 15
Note: Standard-compliant data inversion for PRBS15 and PRBS23 is performed auto-
matically when the PRBS is selected. "Data Polarity" remains unaffected.
SCPI command:
:BERT:SETup:TYPE on page 520
Data Polarity
Sets the polarity of the feedback data bits.
Note: Standard-compliant data inversion for PRBS15 and PRBS23 is performed auto-
matically when the PRBS is selected. "Data Polarity" remains unaffected.
"Norm"
High level stands for logic 1, low level for logic 0.
"Inv"
Low level stands for logic 1, high level for logic 0.
SCPI command:
:BERT:SETup:DATA[:POLarity] on page 517
Clock Slope
Sets the polarity of the active slope of the feedback clock.
"Pos"
The positive slope of the clock signal is active.
"Neg"
The negative slope of the clock signal is active.
SCPI command:
:BERT:SETup:CLOCk[:POLarity] on page 516
Impedance
Sets the input impedance of the BERT inputs "Clock", "Data", "Data Enable" and
"Restart".
For high clock rates, 50 Ohms should be selected.
SCPI command:
[:SOURce]:INPut:BERT:IMPedance on page 522
Threshold
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.
SCPI command:
[:SOURce]:INPut:BERT:THReshold on page 522
External Restart
Activates/deactivates an external restart of the BER measurement.
Bit and Block Error Rate Measurements - BERT Block
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