SMIQ Bit Error Rate Test
1125.5555.03 2.379 E-9
STATE
The status information described in the following tells the user whether the
BLER measurement functions correctly. 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 or NO DATA display. SYNCHRONIZE indicates a successful attempt of
synchronization by the CRC tester. Only when all three displays (CLOCK,
DATA and SYNCHRONIZE) are "active" will the measurement results become
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.
SYNCHRONIZE Successful synchronization to CRC.
NO SYNC No synchronization.
The seven parameters listed above (data blocks, error blocks, block error rate,
attribute "terminated", attribute CLOCK, attribute DATA, attribute SYNC) are
queried together with the IEC/IEEE bus query
:BERT:RES? .
MODE
Setting the BLER measurement mode.
OFF Terminate measurement.
AUTO Continuous measurements of block error rate. If one or both
termination criteria are fulfilled, a new measurement is started
automatically. Depending on the settings made, a measurement
may take considerable time. During the first measurement,
intermediate results are displayed. For all subsequent
measurements, only the final results are displayed. The parameters
RECEIVED BLOCKS and ERRORS are continuously updated and
indicate the relative values for the measurement in progress.
SINGLE Single measurement of block error rate. During the measurement,
the SMIQ cyclically displays the current values for rate, number of
errors and data blocks. If any one of the termination criteria
(TERMINATION ATTRIBUTES [RECEIVED BLOCKS] and
TERMINATION ATTRIBUTES [ERRORS]) is reached, the
measurement is terminated. A SINGLE measurement can only be
triggered when the menu item EXECUTE SINGLE is selected.
IEC/IEEE-bus command
:BLER:STAT ON
:BLER:SEQ SING
EXECUTE TRIGGER
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Triggers a single BLER measurement. This menu item is only displayed when
MODE = SINGLE is selected.
IEC/IEEE-bus command
:TRIG:BLER:IMM
TERMINATION
ATTRIBUTES
RECEIVED BLOCKS
Setting of termination criterion "Number of received data
blocks".
IEC/IEEE-bus command
:BLER:SET:MCO <1>
ERRORS Setting of termination criterion "Maximum number of detected
errors".
IEC/IEEE-bus command
:BLER:SET:MERR <1>
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