Tektronix MTM400 Manual de usuario descargar pdf (Pagina 165)

Interface Configuration and Interpretation

MTM400 MPEG Transport Stream Monitor User Manual 3-121

MER and EVM calculations are performed on the constellation

data according to the formulas given in ETR290-101.

SNR after equalizer

This graph represents the signal-to-noise ratio over time,

typically over 256 seconds. It is useful for examining signal-to-

noise trends; for example, if an alarm condition has been

breached, the graph can be used to examine trends in the signal-

to-noise performance before the alarm occurred.

Equalizer This graph shows the status of the equalizer taps, and gives an

estimate of the channel state. If there are echoes or other time

related distortions on the signal, the Equalizer display will

display the amplitude of the corresponding tap correction values

versus time.

NOTE. The Equalizer graph amplitude values are only

approximate.

MER This graph gives a time record of MER over the last 255

seconds.

Select the graph to be displayed from the Graph drop-down menu.

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Tektronix MTM400 Manual de usuario Pagina 165