Rohde & Schwarz SMBV100A, Operating Manual

Page: 221 / 911

Instrument Function
R&S
®
SMBV100A
206 Operating Manual 1176.8016.02 ─ 17
Restart Delay
Determines the time delay to the start of the user data sequence for the BER measure-
ment. The time value is defined in bits. This parameter requires that the
External
Restart is activated. For basics, see Chapter 5.4.7, "Restart Function" , on page 186.
Remote command:
:TEST:BB:DATA:RDELay
on page 842
5.4.13.3 BER/BLER Functionality Test
The self test verifies the basic functionality of the bit and block error rate tester. The
R&S
SMBV continuously evaluates the incoming signal compared to the outgoing sig-
nal, and displays the results in the corresponding "Bit Error Rate", or "Block Error Rate"
dialog. In addition, you can manually affect the selftest, e.g. to check the functionality
of the LEDs, or the synchronization.
The following instructions explain how to perform the provided selftests by the example
of the bit error rate tester. Proceed in the same way for the block error rate test.
It is assumed, that
●
Protection level 1 is unlocked, for accessing the test generator, see "To enable the
BER/BLER test generator" on page 202.
●
The bit error rate dialog is accessed, see Chapter 5.4.10, "Bit Error Rate Settings" ,
on page 188.
●
The cabling for the selftest is established, see Chapter 5.4.13.1, "Test Generator
Setup" , on page 203.
●
The test generator dialog is accessed, see Chapter 5.4.13.2, "Test Generator Set-
tings" , on page 204.
To check the bit error rate functionality continuously
1. In the "Bit error Rate" dialog, configure the outgoing signal.
2. Select "Test Generator".
3. In the "Test Generator" dialog, configure the corresponding settings.
4. Select "State > On".
5. In the "Bit error Rate" dialog, select "State > On".
The test runs continuously and displays the results in the "Bit error Rate" dialog.
The bit error rate tester works correctly, if no error occurs, and all LEDs are green.
To check the clock signal
► Remove the clock out connection ( Figure 5-7 , (3)).
In the "Bit error Rate" dialog, the "NO CLOCK" LED is expected to turn red.
Bit and Block Error Rate Measurements