Instrument Function
R&S
®
SMU200A
191Operating Manual 1007.9845.32 ─ 15
"Data"
The applied data signal was detected.
"No Data"
The applied data signal was not detected.
Possible causes are:
●
The signal from the DUT is missing.
●
The wrong impedance for the applied clock rate was selected (see
"Impedance" parameter).
●
The wrong threshold for the applied data signal was selected (see
"Threshold" parameter)
"Sync"
The measurement is synchronized.
"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,
this may be caused by the following:
●
A wrong clock slope is used, which violates setup or hold times (see
"Clock Slope" parameter).
●
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
Signal Generator 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).
SCPI command:
:BLER:RESult on page 513
5.4.11.2 Configuration
The "Configuration" section is used to select the type of measurement and the termination
criteria and to set the polarity of the input signals.
Mode
Selects the type of measurement: single or continuous measurement.
"Auto"
Continuous measurement of block error rate.
If either or both of the termination criteria are met, the current measure-
ment is terminated and immediately a new one is started 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 "Received Blocks" and "Errors" are continuously updated
and indicate the relative values for the measurement in progress.
To start a continuous measurement, use the command :BLER:STARt
on page 521. To stop a measurement, use the com-
mand :BLER:STOP on page 521.
Bit and Block Error Rate Measurements - BERT Block
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