3-128
Performance Tests
Transmitted Jitter Amplitude Accuracy (Option UHK)
2. Select TRANSMITTER OUTPUT
SETTINGS [JITTER] 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 3-44.
Figure 3-44 TX Jitter Accuracy Test Setup
5. Adjust the HP 37717C jitter amplitude until the first Bessel Null is observed on
the Spectrum Analyzer i.e first dip in the carrier level. (As an example, Figure 3-45
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 3-5.
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