HP 37718A Installation And Verification Manual page 149

Figure 3-12
Performance Tests
SDH Transmit/Receive Jitter Amplitude Accuracy
24 Set the Calibration Pattern to OFF. Check that there are no SDH errors.
25 Set Receiver Filter to LP+HP1. Select RESULTS. Press RUN to start
measurement.
Check the TX Jitter UI p-p setting is between 0.82 and 1.00 UI p-p
Check the RX Jitter results are between 0.796 and 1.024 UI p-p.
Press STOP to halt measurement.
26 Set the Calibration Pattern to ALT.
27 Change the Receiver Range to 16UI.
28 Change the Jitter Frequency to 4 kHz and adjust the Spectrum Analyzer span to
approx 5 times the Jitter frequency.
29 Adjust the HP 37718A jitter amplitude (approximately 3.52 UI) until the 2nd
Bessel Null is observed on the Spectrum Analyzer i.e 2nd dip in the carrier level
(see Figure 3-12). .
Second Bessel Null Example
30 Set the Calibration Pattern to OFF. Check that there are no SDH errors.
31 Ensure the Receiver Filter to LP+HP1. Select
the measurement.
Check the TX Jitter UI p-p setting is between 3.30 and 3.74 UI p-p
Check the RX Jitter results are between 3.174 and 3.866 UI p-p.
Press STOP to halt measurement.
. Press RUN to start
RESULTS
3-109