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Digital Analysis (QAM View OPT4): Equalizer Mode

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A primary function of this mode is to help the user maintain low levels of

equalizer stress by locating excessive equalization at specific QAM

demodulator digital filter coefficients that require correction.

Each vertical bar on the graph represents an equalizer filter coefficient. The

highest bar represents the test point location, and the descending line to the

right of this bar is the “high” mask. Vertical bars approaching or exceeding

this line will register a “high” stress reading on the display. The “medium” and

“low” masks are not shown on the graph, but each filter coefficient registers

readings with these masks in the same manner.

Basic Operation

To activate EQUALIZER Mode, press the green Function key and then

press the Hum Measurement Mode key.

EQUALIZER Main Screen

From the EQUALIZER Main Screen (Fig. 9-20) you can

• use the right or left diamond keys to place the marker over the desired

measurement coefficient

• move to the LEVEL Submenu to edit the Reference Level or Scale

Parameter of the graph

• select the In-Channel Frequency Response Screen

• select the In-Channel Group Delay Screen.

Use the left and right diamond keys to place the vertical marker over the filter

coefficient to be measured.

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