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Reference
GB1400 User Manual 3-27
Singled-ended or Differential Operation
Analyzer clock and data inputs can be operated in a singled-ended or differential
mode. Differential operation provides greater immunity to ground noise and
EMI. Note that threshold setup applies to the clock and data inputs only when
they are operated in the singled-ended mode. When the clock or data input is
operated in the differential mode, its input threshold effectively becomes the
average of the positive peak and negative peak voltage of the received true and
complement signals.
Procedure to Configure CLOCK or DATA Inputs for Single-Ended
Operation
1. Connect Clock signal to CLOCK input.
2. Connect Data signal to DATA input.
3. Connect cable from rear panel DATA THRESHOLD output to front panel
DATA BAR input.
Selecting the Reference Data Mode
In most testing applications, the Analyzer is set up to compare the received data
pattern with a data pattern generated internally by the Analyzer. However you
may also set up the Analyzer to compare two externally generated patterns. This
makes it possible to analyze framed or proprietary signals that cannot easily be
simulated as long WORD patterns.
To configure the Analyzer for reference data testing, the primary or test signal
must be connected to the Analyzer data input (which may be set up for singled-
ended or differential operation) while the reference signal is connected to the
REF DATA input. Then the Reference Data mode must be selected using the
EXT key. Note that the reference signal must be generated by a singled-ended
output.
Procedure for Selecting the Reference Data Mode
1. Connect a test signal to the Analyzer data input and a reference signal to the
REF input.
2. Press the Analyzer EXT key to toggle the reference mode on. Verify that the
EXT key turns on.
3. To de-select the reference mode, press the EXT key again. Verify that the
EXT key turns off.