Teledyne LeCroy SDA III-CompleteLinQ - Manual (Page 18)

SDAIII-CompleteLinQ Software
Signal Dialog
On the SDA Framework dialog, touch the Signal tab or the Signal Inputs button to access the Signal
dialog.
Lane 1-4 buttons at the far left let you select the Lane to be configured for signal. If you made this selec-
tion earlier on the SDA Framework dialog, it will persist on the Signal dialog.
Serial Data Input(s) section lets you define the serial data input(s). If you are using a differential probe or
if your signal is connected by one coaxial cable, you can select 1 Input (or Diff. Probe) and specify the
input source in the Input1 box. If you are using two single-ended probes or two coaxial cables, you can
select Input1-Input2 and specify the input sources to use when calculating the differential signal. For
more information, see
Serial Data Inputs .
Crossing Level section lets you to set the voltage level at which the signal timing is measured. The cross-
ing level is set separately for the data and clock signals (if an external clock is selected) and can either be
an absolute voltage or a percentage of the signal amplitude via the relative selection. You can also con-
figure a hysteresis level, and between positive, negative and both edge types for when the "Clock" Signal
Type is selected. The Crossing Level section on this dialog is for the data signal. For more information, see
Crossing Levels .
Signal Type section lets you choose a standard signal type. The signal type you choose automatically
sets the nominal bit rate for the selected standard, and populates the Mask Type selector in the Eye
dialog. For more information, see
Signal Types .
Noise Settings includes settings that are used by the vertical noise measurements toolkit. Settings
include the Sample Phase, which determines where in the unit interval the sample is taken for the noise
measurement. Also, see
How to Order SDAIII-CompleteLinQ Capabilities for information on which prod-
ucts include the vertical noise analysis capabilities.
NOTE:
l
Many of the measurements in SDAIII-CompleteLinQrequire both a high sampling rate and long
memory to compute jitter and vertical noise accurately.
l
Lower sampling rates can result in less accurate jitter measurements, and short record lengths can
give incomplete eye patterns or jitter and noise displays that diverge.
l
For best results, acquire waveforms with at least 100,000 unit intervals, and of >100 iterations of
the pattern. See
Jitter Pattern Analysis .
For step-by-step instructions, see Set Up Signal .
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