User`s guide
Manual Channel Skew - Clicking on this button will reveal a panel for
entering relative channel skews for up to 10 channels. Manual Channel
Skew is used to compensate for external paths. The Deskew Calibration
Only and Deskew Calibration with DC Offset will deskew the internal
paths of the
SIA-3000 to the front panel SMA connectors. These
calibrations do not compensate for external cables from the
SIA-3000
inputs. Some measurements that the
SIA-3000 makes are between
channels or "channel to channel." Examples are the Propagation Delay
and Skew, DataBus and Random Data with Bit Clock tools. It is
important to use matched cables to perform these measurements. If
matched cables are not available, but the electrical length (or time delay) of the cables are known, the Manual
Channel Skew Dialog Box allows these times to be subtracted from these external paths in the measurements. It is
also sometimes necessary to compensate for skew that is particular to the Device Under Test. The values entered in
Manual Channel Skew will affect ALL channel-to-channel measurements until these settings are reset to zero.
Powering down the
SIA-3000 will also reset these values to zero.
NOTE: When measuring differential signals using two cables per channel, the cables should be a matched pair. This
skew table does not compensate for mismatches in this pair and is only for channel-to-channel measurements. A
mismatched pair may lead to other problems such as causing the cross point of the signals to appear too close to the
top or bottom at the
SIA-3000 inputs and not in the middle, or 50%.
Map Network Drive - Make a network drive available to this instrument.
Margin (%) - The amount of margin allowed in the masked regions.
Markers - Provides movable grid lines. The four movable markers can be displayed all at once, horizontal markers only,
vertical markers only or no markers at all. Text near the top right of the panel displays the position of each marker
and the difference between them. Markers can be positioned by using the right button of a pointing device
(mouse). Click and drag near the marker to be repositioned using the right mouse button. Release the mouse button
when the marker is positioned in the desired location. Note that you do not need to click directly on top of a marker
in order to select it. The marker nearest your pick point will be selected.
Markers Both (Display menu) - Displays both horizontal and vertical markers. Markers can be positioned by using
the right button of a pointing device (mouse). Click and drag near the marker to be repositioned using the right
mouse button. Release the mouse button when the marker is positioned in the desired location. Note that you do not
need to click directly on top of a marker in order to select it. The marker nearest your pick point will be selected.
Mask Dimensions - The Eye Mask can be sized either in absolute or relative terms. When "absolute" is selected, the
mask is sized using voltage levels and timing values. Selecting "relative" will allow you to scale the mask as a
percentage of an existing eye on the screen. To do this, first center the eye on the screen. Then select the
percentage sizes for height, width, etc and press "Scale to Fit". This will set up the mask from the entered values
relative to the displayed eye.
Mask Name - Displays the name of the loaded mask.
Mask Setup - Clicking on this button opens a dialog bar for selecting, saving, sizing and positioning of the Mask.
Maximum Effective Rate - Enter maximum value for curve fit range when calculating effective deterministic and
random jitter.
Maximum Filter (MHz) - Upper frequency limit for the window over which RJ and PJ is calculated. Default is
Nyquist. See RJ + PJ max filter.
Maximum Frequency (kHz) - Determines the resolution of plot in the FFT view or the time between measurements in
Time View. Decreasing the Maximum Frequency increases the time between measurements allowing lower jitter
frequencies to be captured.
©
WAVECREST Corporation 2005
Glossary
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