Tektronix 071-0590-00 Error History Indicators, Analyzer performance history indicators are

Reference

TES: Threshold Errored Seconds: The number of seconds in the measurement interval in which BER exceeds the threshold set by the THRES parameter in the TEST Menu, minus the number of unavailable seconds. Available threshold values are 1E-n, where n = 2, 3, ... 16.

TES = (seconds with BER ≥ Threshold) - US

US = unavailable seconds in the current interval

Degraded Minutes (DM): The number of 60 second intervals in the current interval in which the BER exceeds the current test threshold (THRES).

Percentage Degraded Minutes (%DM): The number of degraded minutes expressed as a percentage of the total number of minutes in the measurement interval.

% DM = ( DM / TM) * 100%

DM = degraded minutes in the measurement interval

TM = total minutes in the measurement interval

Unavailable Seconds (US): The number of seconds in unavailable intervals. Unavailable intervals start upon the detection of 10 contiguous severely errored seconds (SES), and end upon the detection of 10 non- severely errored seconds.

Percentage Unavailable Seconds (%US): The number of unavailable seconds expressed as a percentage of total seconds in the measurement interval.

% US = ( US / TS) * 100%

US = unavailable seconds in the measurement interval

TS = total seconds in the measurement interval

Error History Indicators

SYNC LOSS	CLEAR	The Analyzer (performance) history indicators are
BIT		located in the ERROR HISTORY section of the front
PHASE
		panel. These indicators will latch on when the indicated
POWER
		event occurs, and can be cleared by the user.

SYNC LOSS: This indicator will turn on if the LOCK LED turns off; that is if the BER rises above the current synchronization threshold (See Synchronization (LOCK) Threshold in Chapter 4)

BIT: Will turn on if a bit error is detected.

PHASE: Will turn on if a phase error is detected. The Analyzer will report a phase error when the active clock edge moves too close to the data waveform transition point thus violating the input circuit setup or hold time.

POWER: Will turn on after a power loss has occurred.

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