Instrument Function
R&S
®
SMBV100A
199Operating Manual 1176.8016.02 ─ 17
"No Sync"
The measurement is not synchronized.
Generally, a measurement cannot be synchronized until a clock and
a data signal have been detected. If synchronization still does not
occur, can be caused by:
●
A wrong clock slope is set, which violates setup or hold times.
●
Reflections on the clock line occur and clock the data signal into
the BER measurement twice, e.g. on lines without termination.
The R&S SMBV input is not terminated.
●
The travel times of clock and data are unfavorable (e.g. clock
slope with data change).
Check the relationship of clock to data using an oscilloscope and
optimize the travel times (e.g. clock slope when the data signal
applied is stable).
Remote command:
:BLER:RESult? on page 534
5.4.11.2 Configuration Settings
The "Configuration" section is used to select the type of measurement and the termina-
tion criteria and to set the polarity of the input signals.
Mode
Selects the type of measurement.
"Auto"
Continuous measurement of block error rate.
If either or both of the termination criteria are met, the current mea-
surement is terminated and immediately a new one is started auto-
matically. Depending on the settings made, a measurement can take
considerable time. During the first measurement, intermediate results
are displayed. For the measurements that follow, only the final results
are shown. The parameters "Received Blocks" and "Errors" are con-
tinuously updated and indicate the relative values for the measure-
ment in progress.
To start a continuous measurement, use the command :BLER:
STARt on page 542. To stop a measurement, use the command :
BLER:STOP on page 543.
"Single"
Single measurement of bit error rate. The measurement is started by
clicking the "Execute Single" button.
If a measurement is in progress, the current values for "Block Error
Rate", "Errors" and "Received Blocks" are cyclically displayed. The
measurement is terminated when either or both of the termination cri-
teria have been reached. To start a new measurement, the "Execute
Single" button must be clicked again.
Remote command:
:BLER:SEQuence on page 536
:TRIGger:BLER[:IMMediate] on page 544
Bit and Block Error Rate Measurements
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