User`s guide

Deskew Calibration with DC Offset
The Deskew Calibration with DC Offset calibration compensates for DC offsets and then
automatically performs a “Deskew Calibration”. This calibration ensures less than 10ps skew
between all channels at the input connectors. This does not calibrate to the end of the cables
used, only internal paths. Upon completion of this step, you may close the calibration dialog box
and resume using the
SIA-3000; it is not necessary to continue with further calibrations. The
SIA-3000 is now ready to make measurements.
A quick test to check Deskew with DC Calibration
The GigaView software can be used to check the calibration.
• Connect the calibration signals to the channel you want to check. (Make sure the 'Normal
Calibration Output State' in the Calibration menu is set to '900MHz sine – Out of Phase'.)
• Select the tool.
• In the top toolbar press the Pulse Find button . Observe the Pulse Find Box (See figure below).
The
Minimum, Maximum and Threshold voltage values will be displayed for the channels that the user
has selected.
Deskew with DC cal is good if:
The Threshold(s) voltage is 0.000V ±10mv.
Deskew Calibration
This calibration only deskews between channels and internal signal paths to the channel input
connectors. This is an optional calibration. This does not calibrate to the end of the cables used.
The DC offset calibration is not performed.
You do not need to perform this calibration if you have already performed “Deskew Calibration
with DC Offset”.
• Select “Deskew Calibration”.
• A dialog window appears informing the user to connect the calibration cables (use provided
matched cables).
• Follow the onscreen instructions to complete the calibration.
• Note polarity of connections, as this will change as you proceed through the cal.
Appendix C © WAVECREST Corporation 2005
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