Tektronix MTM400 Instrukcja Użytkownika Pobierz pdf (Strona 157)

Interface Configuration and Interpretation

MTM400 MPEG Transport Stream Monitor User Manual 3-113

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

Lock indicator will light up

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 the period in seconds between samples of the incoming

signal to be set.

Persist Allows the time that the dots persist on the grid display to be set.

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.

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Tektronix MTM400 Instrukcja Użytkownika Strona 157