Bit Error Rate Test
SMIQ
1125.5555.03
2.370
E-9
STATE
The status information described in the following tells the user whether the
BER measurement is working. The STATE display signals the status of clock
line, data line and synchronization. If the clock signal changes, CLOCK is
indicated as status, otherwise NO CLOCK. The same applies to the data
display DATA or NO DATA. NO DATA may be displayed because DATA
ENABLE is not set to NOT USED or the data enable signal does not enable
the data. SYNC indicates a successful attempt of PRBS synchronization by
the analyzer. It is not before all three of CLOCK, DATA and SYNC are "active"
that the measurement results are valid.
CLOCK
Change of clock signal.
NO CLOCK
No change of clock signal.
DATA
Change of data signal.
NO DATA
No change of data signal.
SYNC
Successful synchronization to PRBS.
NO SYNC
No synchronization.
The seven parameters listed above (data bits, error bits, error rate, attribute
"terminated", attribute CLOCK, attribute DATA, attribute SYNC) are jointly
polled by the IEC/IEEE bus query
:BERT:RES?
.
MODE
Setting for the BER measurement.
OFF
Terminate measurement.
AUTO
Continuous measurement of bit error rate. If one or both criteria for
termination are fulfilled, a new measurement is initiated
automatically. Depending on the settings made, a measurement
may take considerable time. During the first measurement,
intermediate results are displayed. For the measurements that
follow, only the final results are shown. The parameters DATA BITS
and ERRORS are continuously updated and indicate the relative
values for the measurement in progress.
SINGLE Single measurement of bit error rate. During the measurement, the
SMIQ cyclically displays the updated values for rate, number of
errors and number of data bits. If any one of the termination criteria
(TERMINATION ATTRIBUTES [DATA BITS] and TERMINATION
ATTRIBUTES [ERRORS]) is reached, the measurement is stopped.
A single measurement is initiated only if the menu item EXECUTE
SINGLE is selected.
IEC/IEEE-bus command
:BERT:STAT ON
:BERT:SEQ SING
EXECUTE SINGLE
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Initiates a single BER measurement. This menu item is only displayed if
MODE = SINGLE is set.
IEC/IEEE-bus command
:TRIG:BERT:IMM
TERMINATION
ATTRIBUTES
DATA BITS
Setting the termination criterion "Number of transmitted data bits".
IEC/IEEE-bus command
:BERT:SET:MCO <1>
ERRORS
Setting the termination criterion "Maximum number of detected
errors".
IEC/IEEE-bus command
:BERT:SET:MERR <1>
