Description and Basic Operation: Configuring the SDA-5000
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the calibration, select C/N calibration and press the Enter key. To get a
valid measurement, the program prompts you to be sure that no cable is
connected to the RF IN connector. After the measurement is verified,
press the OK soft key to perform the calibration. When the calibration is
complete, the screen displays the noise floor, expressed in the currently
selected units (e.g. dBmV).
Digital Analysis (QAM OPT4) Options
• Digital Signal Quality Meas: This option enables you to select the
digital signal quality measurement you want to use:
• MER (modulation error ratio) is analogous to an analog carrier-to-noise
measurement
• EVM (error vector magnitude) is MER data presented in a percentage
format.
• Number of Constellation Points: You can set the number of
constellation points displayed in Constellation mode to 2000, 4000, or
8000. The unit defaults to 4000.
• Velocity of Propagation: The velocity of propagation is the ratio of the
speed at which light travels down a length of cable compared to its
absolute speed. It is determined by the dielectric material used to
separate the two conductors and is usually specified by the cable
manufacturer. After you have consulted the manufacturer’s
specifications, enter a value between 0.00 and 1.00.
• Distance Units: In Equalizer Mode, this option enables you to set the
units for measuring the distance to the fault in either feet or meters. This
option defaults to feet.
Channel Plan Configuration
Selecting the CHANNEL PLAN option from the CONFIGURE menu takes
you to a screen where you can set nine channel plan configuration options.
These options allow you to
• Select a channel plan
• Set the video signal type
• Set the channel tuning sequence
• Build a channel plan
• Edit a channel plan
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