Tektronix 071-0590-00 user manual Analyzer Error Detection Section, Analyzer Sync Controls

Functional Overview

Analyzer ERROR DETECTION Section

The ERROR DETECTION section contains test setup and display controls.

ERROR DETECTION

DISPLAY

CLEAR SYNC

LOCK

AUDIO

VOL RATE AUTO

SEARCH

DISABLE

DISPLAY SELECT: Use this control to select which results are displayed in the Bit Error Rate (BER) fields. The options are Window, Totalize, or Test.

∙CLEAR: Press this key to clear previous results and to start/stop timed tests.

∙AUDIO VOL (− ,↓ ): Use these keys to increase or decrease the volume of the Analyzer's error beeper function.

∙AUDIO RATE (− ,↓ ): Use these keys to increase or decrease the error rate threshold of the beeper function. Selections are 1E-x, where x = 2, 3, ... 16.

Analyzer SYNC Controls

The ERROR DETECTION section contains the following SYNC controls which are used to set up the Analyzer's automatic synchronization functions:

∙AUTO SEARCH: Press this key to enable (LED on) or disable (LED off) AUTO SEARCH. With AUTO SEARCH enabled, each time BER goes above the synchronization threshold (LOCK LED turns off) the Analyzer will automatically attempt to:

1.set the decision level for the DATA inputs,

2.set input DATA delay,

3.determine which PRBS or short word pattern is being received, and

4.determine if the pattern is inverted or not.

∙DISABLE: Use this key to enable or disable automatic pattern re- synchronization. If DISABLE is off, then the Analyzer will automatically try to resynchronize its pattern detector (by looking for a new pattern alignment) when BER goes above the current synchronization threshold. If DISABLE is on, the Analyzer will not attempt to resynchronize regardless of the BER. This allows for very high BER measurements.

This key controls the "clock slip" operation of the BERT. An illuminated DISABLE LED indicates the synchronization (clock slip) circuit is disabled.

∙LOCK (indicator): This indicator turns ON when BER is less than the current synchronization threshold, and OFF when BER is greater than or equal to this threshold.

GB1400 User Manual 2-25