Rohde & Schwarz SMU200A - Page 210

Instrument Function
R&S
®
SMU200A
190Operating Manual 1007.9845.32 ─ 15
Errors
Displays the current number of occurred errors.
SCPI command:
:BLER:RESult on page 513
Terminated By
Displays the termination criterion for the measurement.
These criteria can be entered to keep the duration of the measurement short for low as
well as high block error rates.
The last measurement result is displayed after the measurement has been terminated.
"User"
The measurement was manually terminated by the user switching the
state to off.
SCPI command:
:BLER:STATe on page 521
:BLER:STOP on page 521
"Number of
Data Blocks"
The measurement was terminated because the specified number of data
blocks was reached.
"Number of
Errors"
The measurement was terminated because the specified number of
errors was reached.
SCPI command:
:BLER:RESult on page 513
State
Displays the status of the measurement.
A green LED indicates a correct status, a red LED a critical status.
This allows the user to check whether the measurement functions. The status of the data
and clock lines and of synchronization is checked and displayed.
If a faulty status is displayed, the signals can be checked at the BERT interface using an
oscilloscope.
"Clock"
The applied clock signal was detected.
"No Clock"
The applied clock signal was not detected.
Possible causes are:
●
Clock recovery is not available (e.g. with tests of RF components).
If the signal is generated using the instrument family, the bit clock
can be extracted from the CLOCK output connector (only with "Cus-
tom Dig Mod" signals in realtime). If signals complying with other
digital standards are generated or if ARB waveforms are used, a
marker signal can be used as a clock. As the DUT causes a delay,
the ratio of clock-to-data travel times must always be taken into
account and checked with an oscilloscope if necessary.
●
The wrong impedance for the applied clock rate was selected (see
"Impedance" parameter).
●
The wrong threshold for the applied clock signal was selected (see
"Threshold" parameter).
Bit and Block Error Rate Measurements - BERT Block