Teledyne LeCroy WaveExpert 100H Operators Manual User Manual
Page 63
Wave Expert
WE-OM-E Rev A
61
SAMPLING MODES
There are two sampling modes available on Wave Expert 100H when option WE-HCIS is ordered.
The standard sampling mode is sequential (SEQ) and the optional mode is CIS. The sequential or
WE-CIS timebase is similar to traditional sampling scopes. The CIS timebase offers powerful
capabilities for measuring high speed serial data signals and setting it up is different from the more
traditional sequential timebase.
To select a sampling mode
1. In the menu bar, touch Timebase, then Horizontal Setup... in the drop-down menu.
2. In the "Horizontal" dialog, touch a Sample Mode button. The CIS mode includes several
settings that must be made.
Timebase controls
• Signal Standard - this control selects the signal standard being tested. The signal
standard selects the compliance mask that will be used in eye mode and sets the
bit rate control when the CIS timebase is being used.
• Bit Rate (CIS timebase only) – This control sets the bit rate of the signal under test.
The rate can be entered directly or set by the signal standard. The Find Rate
button is used to lock the timebase automatically to the clock signal applied to the
Prescale input. It is recommended that the Find Rate button always be used to set
the timebase.
• Ext. Divider (CIS timebase only) – this control allows sub rate clock signals to be
used at the Prescale input. The number in this control is the ratio of the bit rate to
the applied clock. For example, if a 1/8
th
rate clock is applied to the Prescale input,
the value 8 must be entered into the Ext. Divider contol. The Input Clk Rate readout
shows the frequency of the applied clock while the Bit Rate contol sets the bit rate
of the signal under test.
• Std. Pattern (CIS timebase only) - When a pattern locked waveform is required,
touch this control and select the standard pattern from the list. Selecting “Custom”
from the list allows an arbitrary length to be used. The available memory restricts
the maximum length that can be used. The amount of memory required is equal to
the pattern length x samples/UI. The following choices are available:
o
10.
o
20.