Operating Manual Vol 1 - ES Documentation

SMIQBit Error Rate TestSTATEMODEEXECUTE TRIGGERTERMINATIONATTRIBUTESThe status information described in the following tells the user whether theBLER measurement functions correctly. The STATE display signals the statusof clock line, data line and synchronization. If the clock signal changes,CLOCK is indicated as status, otherwise NO CLOCK. The same applies to theDATA or NO DATA display. SYNCHRONIZE indicates a successful attempt ofsynchronization by the CRC tester. Only when all three displays (CLOCK,DATA and SYNCHRONIZE) are "active" will the measurement results becomevalid.CLOCKChange of clock signal.NO CLOCK No change of clock signal.DATAChange 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) arequeried together with the IEC/IEEE bus query :BERT:RES? .Setting the BLER measurement mode.OFF Terminate measurement.AUTO Continuous measurements of block error rate. If one or bothtermination criteria are fulfilled, a new measurement is startedautomatically. Depending on the settings made, a measurementmay take considerable time. During the first measurement,intermediate results are displayed. For all subsequentmeasurements, only the final results are displayed. The parametersRECEIVED BLOCKS and ERRORS are continuously updated andindicate 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 oferrors and data blocks. If any one of the termination criteria(TERMINATION ATTRIBUTES [RECEIVED BLOCKS] andTERMINATION ATTRIBUTES [ERRORS]) is reached, themeasurement is terminated. A SINGLE measurement can only betriggered when the menu item EXECUTE SINGLE is selected.IEC/IEEE-bus command :BLER:STAT ON:BLER:SEQ SINGTriggers a single BLER measurement. This menu item is only displayed whenMODE = SINGLE is selected.IEC/IEEE-bus command :TRIG:BLER:IMMRECEIVED BLOCKSSetting of termination criterion "Number of received datablocks".IEC/IEEE-bus command :BLER:SET:MCO ERRORS Setting of termination criterion "Maximum number of detectederrors".IEC/IEEE-bus command :BLER:SET:MERR 1125.5555.03 2.379 E-9