3-137
Performance Tests
Transmitted Jitter/Wander Amplitude Accuracy (Option A3K [A3Q])
2. Select and
setup the display as shown opposite.
3. Set the Spectrum Analyzer as follows:
Centre Frequency - 2048 kHz
Frequency Span - 25 kHz
Reference Level - 0 dBm
Sweep Time - 1.0 s
Video Bandwidth - 1 kHz
Resolution Bandwidth - 100Hz
4. Connect up the equipment as shown in Figure 3-46.
Figure 3-46 TX Jitter Accuracy Test Setup PDH Range 1 & 10
5. Adjust the HP 37717C jitter amplitude (approximately 0.77 UI) until the first
Bessel Null is observed on the Spectrum Analyzer i.e first dip in the carrier level. (As
an example Figure 3-47 shows the first Bessell Null for 34MHz.)
6. Ensure the Jitter amplitude displayed on the HP 37717C is between the minimum
and maximum limits given in Table 3-7.
TRANSMIT
JITTER
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