Teledyne LeCroy WaveExpert 100H Operators Manual User Manual

Page 70

Operator’s Manual

WE-OM-E Rev A

TIMEBASE AND ACQUISITION SYSTEM

Autosetup

The autosetup function operates differently depending upon the operating mode of the instrument.
The functions included in autosetup are vertical scaling, setting the bit rate of the signal under
test ,and setting the horizontal scale.

You can perform an autosetup of all these functions together by simply pressing A

UTO

ETUP

on the

front panel, or by touching Autosetup

in the Vertical, Timebase, or Trigger

drop-down menu. The autosetup operates in the following way for each operating mode:

Scope Mode

Sets the vertical scale to 120% of the signal amplitude, finds the bit rate, and sets
the horizontal scale to 1 UI per division (UI = 1/bit rate).

Eye Mode

Sets the vertical scale to 120% of the signal amplitude, finds the bit rate, sets the
horizontal scale to 1.66 unit intervals (0.166 UI/division), and sets the UI offset to 0.

TDR Mode

Sets the selected channel to average mode (32 sweeps), the horizontal scale to
100 ps/division, and the trigger to TDR mode (free running)

Timebase Setup and Control

Set up the timebase by using the front panel Horizontal controls, just as for analog scopes. The
timebase in a sampling oscilloscope such as the WaveExpert is controlled by the trigger signal.
Therefore, the sampling rate is set by the trigger signal frequency and is limited by the maximum
acquisition rate of approximately 500 kS/s in Sequential mode. The sampling rate is fixed at 10
MS/s in CIS mode. Adjusting the horizontal scale control varies the amount of waveform memory
used by the acquisition system.

Touch Timebase in the menu bar and then Horizontal Setup… in the drop-down menu to display
the "Horizontal" menu. The menu consists of 4 sections.

Operation Modes

The Operation Mode section contains three buttons, which are also available on the instrument
front panel in the Quick Set control group. Each mode affects the horizontal and vertical menus, as
well as the display mode, as appropriate for the selected mode of operation.

Scope Mode

Scope mode is selected by touching the Scope button in the "Horizontal" menu or by pressing the
Scope button on the instrument front panel in the Quick Set control group. The scope mode
displays waveform data directly on the screen either as a voltage vs. time waveform or as an eye
pattern, depending upon the trigger type and sampling mode.