Tektronix MTM400 User Manual page 181

MTM400 MPEG Transport Stream Monitor User Manual
EVM (%) (Error Vector Magnitude) Closely related to, and can normally
be calculated from, MER. It is a ratio of 'errored signal vectors'
to maximum signal amplitude expressed as a percentage
(ref: TR 101 290 Annex).
BER (Bit Error Rate) Provides an indication of the Forward Error
Correction workload.
TEFs (Transport Error Flag or TEI transport error indicator) Indicates
the Forward Error Correction failure.
Lock If the interface is able to acquire full lock onto the channel and is
receiving the signal correctly, the
green. Red indicates that lock cannot be achieved. Gray
indicates that a signal is not present.
The Settings area of the screen contains the following controls:
Update (s) Allows you to set the period in seconds between samples of the
incoming signal.
Persist Allows you to set the time that the dots persist on the grid
display.
The Log area of the screen contains the following controls:
File Constellation data can be written to the file identified in this
field; data is saved in csv format.
Interface Configuration and Interpretation
Lock indicator will light up
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