Keysight EXG and MXG X-Series Signal Generators User’s Guide 417
Using BERT for N5172B/82B with Option UN7
Verifying BERT Operation
Figure 16-18 Configuration Using Custom Digital Modulation
BERT Verification
1. Press BERT Trigger to Immediate.
Notice the cycle counter updating in the lower left-hand corner of the signal generator
display.
2. Disconnect the cable connecting the DATA OUT to BER DATA IN connectors.
Notice the No Data annunciator in the lower left corner of the display and the BER result is
approximately 50%. The Error Bits counter updates the error bit count. Re-establishing the
connection turns the annunciator off, and sets the error bits count to 0 bits and BER
0.00000000%.
3. Disconnect the cable connecting the DATA CLK OUT to BER CLK IN connectors.
Notice the No Clock annunciator in the lower left corner of the display. This annunciator
turns off when you re-connect the cable, but the error bits counter and BER % readings
indicate loss of synchronization.
4. Press Return.
Toggle the BERT Off On softkey to Off and to On. You will see the new BER result as shown in
the previous front-panel display with the Error Bits counter reading 0 Bits and BER
0.00000000%.
If the verification procedures produce the expected results, then the signal generator BERT
measurement function is operating correctly. If the above procedure produces unexpected results,
then contact the Keysight Service Center. For a list of Keysight Service Centers, refer to the
X-Series Signal Generators Getting Started Guide.
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