Wavetek 147 Especificações descarregar pdf (Página 194)

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Digital Analysis (QAM View OPT4): Constellation Mode

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CONSTELLATION Main Screen Features

From the CONSTELLATION Main Screen (Fig. 9-15) you can

• view a graphic depiction of the signal

• examine MER and BER data

• select closer views of the impairment

• edit the modulation format and symbol rates

• access the QAM Level display.

Fig. 9-15 CONSTELLATION Main Screen

The SDA will automatically attempt to lock-on to the QAM signal of the

designated channel (or frequency). Lock errors may result from a variety of

conditions, including improper unit configuration or cable connection.

Connect the cable to the digital port on the unit before using any of the four

digital modes.

If initially unsuccessful, the following error message will appear:

“ERROR … Signal Unlocked! Confirm Connection to Dig Port. Retry.”

Press this soft key to retry to lock onto the QAM signal. This key

will appear in the lower right corner of the screen when lock

errors occur, otherwise the key will remain blank.

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