Instrument Function
R&S
®
SMBV100A
195Operating Manual 1176.8016.02 ─ 17
Remote command:
:BERT:SETup:DENable on page 539
Pattern Ignore
Activates ignoring of pure "0" or "1" bit sequences at least 32 bits long. Activating "Pat-
tern Ignore" excludes faulty frames from the measurement.
In the case of some mobile radio standards, pure "0" or "1" bit sequences are gener-
ated when errors (e.g. an incorrect checksum) are detected within a frame. These
sequences, instead of the frame data, are provided for the BER measurement and sig-
nal that the frame in question should not be used for the measurement.
The R&S SMBV ignores sequences of 32 bits or longer, see Chapter 5.4.9, "Pattern
Ignore", on page 187.
Note: While ignoring the bits, the PRBS generator for the BER measurement keeps
running. Following the "0" or "1" sequence, the BER measurement is continued as if
the ignored sequence had contained PRBS data.
If "Pattern Ignore" is switched on, synchronization time is 32 bits longer.
If "Pattern Ignore" and "External Restart" are active at the same time, the measure-
ment terminates immediately when the restart signal is applied. None of the 32 bits
within the "Pattern Ignore" detector is evaluated.
If "Data Enable" and "Pattern Ignore" are active at the same time, "Data Enable" is
given priority, i.e. bits that are not enabled are not examined for "0" or "1" sequences.
"Off"
Pattern ignore is not active.
"All 1"
Bit sequences consisting of 32 or more consecutive "1" data are not
used (i.e. ignored) for the BER measurement.
"All 0"
Bit sequences consisting of 32 or more consecutive "0" data are not
used (i.e. ignored) for the BER measurement.
Remote command:
:BERT:SETup:IGNore on page 539:BERT:SETup:DENable on page 539
Threshold
Sets the threshold (high/low ) in volts for the input signals "Clock", "Data", "Data
Enable" and "Restart".
The variable threshold enables you to align the level of different input signals. In addi-
tion, reflections and other interference can be suppressed by selecting the appropriate
threshold.
Remote command:
[:SOURce]:INPut:BERT:THReshold on page 544
Impedance
Sets the input impedance of the input signals "Clock", "Data", "Data Enable" and
"Restart".
For high clock rates, select 50 Ohms.
Remote command:
[:SOURce]:INPut:BERT:IMPedance on page 543
Bit and Block Error Rate Measurements
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