Rohde & Schwarz SMBV100A, Operating Manual

Page: 220 / 911

Instrument Function
R&S
®
SMBV100A
205 Operating Manual 1176.8016.02 ─ 17
The "BER/BLER Test Generator" dialog contains the parameters required to per-
form the selftest. Depending on the "Data Enable" and "Restart" settings in the "Bit
Error Rate", or "Block Error Rate" dialogs, the available trigger parameters vary.
In the BLER test, the CRC is calculated on the basis of the test sequence "PRBS9".
The value is set by default. In contrast to the BER test, it cannot be adjusted.
The remote commands required to define these settings are described in Chapter 7.19,
"TEST Subsystem" , on page 840.
State
Activates the BER/BLER selftest.
Remote command:
:TEST:BB:DATA:STATe
on page 842
Clock Frequency
Selects the clock frequency for the BER/BLER test generator.
Remote command:
:TEST:BB:DATA:FREQuency
on page 841
Error Rate
Sets the error bit pattern.
This parameter allows you to specify defined error bits to check whether the BER/
BLER function detects the error properly.
Remote command:
:TEST:BB:DATA:ERRor:RATE
on page 841
Trigger
Selects the trigger input mode.
"Not Used" Ignores the data enable and restart signals. The test generator
acquires all input data.
"Data Enable"
Acquires all input data within the measurement interval, determined
with the
On Time , and Off Time .
"Restart" Acquires the input data at each sequence start.
Remote command:
:TEST:BB:DATA:TRIGger[:MODE]
on page 842
On Time, Off Time
Determines the time interval of the "Data Enable" signal for data acquisition. The time
values are defined in bits. For BER measurements, it is prerequisite, that you have
selected
Data Enable > "High", or "Low" . The setting Data Enable > "Not Used" sup-
presses these parameters. For basics, see Chapter 5.4.8, "Data Enable" , on page 187
Remote command:
:TEST:BB:DATA:ONTime
on page 842
:TEST:BB:DATA:OFFTime
on page 842
Bit and Block Error Rate Measurements