Teledyne LeCroy QPHY-DDR2 - Manual (Page 25)

QPHY-DDR2 Software Option
QPHY-DDR2-OM-E Rev A
25
Checking this box allows:
 Calibration of gain/offset only
 Calibration of deskew only
 Access to the advanced menu (shown as a tab behind the "Probes Cal" dialog)
Gain/Offset Only
Pressing this button performs only the DC calibration of the probe on the specified channel. See details of DC
Calibration Theory of Operation in TF-DSQ Operation Manual. DO NOT use with PCF200 connected to Fast Edge
output.
Deskew Only
Pressing this button performs only the deskew calibration of the probe on the specified channel. See details of
Deskew Theory of Operation in TF-DSQ Operation Manual.
This is the button to use with PCF200 connected to Fast Edge output.
The Advanced Menu
Figure 19. Probes Calibration menu Advanced tab
The Advanced Menu contains information and functionality useful to the advanced user of the PCF200 fixture.
These include:

Rise Time Skew Correction

Differential(or Single-Ended) probe selection

Deskew All (or common deskew capability)

Common mode voltage settings for DC calibration
Rise Time Skew Correction
This field shows the signal risetime and the corresponding skew correction based on the signal risetime.
When probes are deskewed, the risetime measurement of the edge used for deskewing is displayed in the Rise
Time field corresponding to the probe and probe channel, and an additional skew correction of zero is applied.
The measured risetime of the signals encountered can be entered into the Rise Time field, and the oscilloscope
automatically calculates and applies a new skew correction value to be utilized in addition to the deskew amount
calculated during the deskew calibration procedure. With this use, a finer deskew calibration is performed
because the risetimes of the signals measured are now taken into account. Refer to the Deskew Risetime
Adjustment Theory of Operation in the TF-DSQ Operat
or’s Manual on the LeCroy website for details.