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Functional Overview
GB1400 User Manual 2-25
Analyzer ERROR DETECTION Section
The ERROR DETECTION section contains test setup and display controls.
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.
ERROR DETECTION
DISPLAY
CLEAR
LOCK
DISABLE
VOL
RATE
AUDIO
AUTO
SEARCH
SYNC