Teledyne LeCroy QPHY-DDR2 - Manual (Page 23)

QPHY-DDR2 Software Option
QPHY-DDR2-OM-E Rev A
23
Figure 17. Basic Probes Calibration menu
The information in the probe calibration menu is organized such that each row represents the information for a
given channel, and each column represents the calibration information or control for that channel. For each
channel, the information and control provided includes:

The channel number in the colored button icon and the probe type that is installed.

A Full Calibration button, which starts the calibration. Use only with TF-DSQ. DO NOT use with PCF200.

DC correction information including both gain and offset correction.

The skew correction.

A Clear button.
Probe
This area shows the type of probe connected to the channel. All other information shown in a given row is
associated with that probe.
Full Calibration Button
This button causes the oscilloscope to automatically perform a full DC and deskew calibration. See details of DC
Calibration Theory of Operation and Deskew Theory of Operation in TF-DSQ Operation Manual. Use only with
TF-DSQ. DO NOT use with PCF200.
Gain & Offset
These fields show the gain and offset applied to the probe. If the probe measures a voltage of V, the new,
calibrated voltage is:
Offset Gain V V
calibrated
  
Note that the offset is in Volts, and the gain is unitless.
The probe DC calibration information can be entered either manually or as the result of an automatic calibration.
In the case of automatic calibration, it can be part of the full calibration or it can be a standalone DC calibration
executed in advanced mode. When the DC calibration information is a result of an automatic calibration utilizing
the TF-DSQ fixture, the information shown is the gain and offset utilized for the currently configured channel
sensitivity (volt/division setting; see details of DC Calibration Theory of Operation in the TF-DSQ Operato
r’s
Manual on the LeCroy website for details). In this case, when the channel sensitivity is altered these values
change. When the DC calibration information is entered manually, it clears any automatic results and
replaces them globally with the newly entered values. This means that if new gain and offset numbers are
entered manually, these values apply across all sensitivity oscilloscope settings.
The gain is limited to between 0.8 and 1.2, but the offset is not limited.
Note: It is important to note that some passive probes, and any user-designed probes, do not provide proper probe identification information to
the oscilloscope. In these cases, the oscilloscope may not be able to determine the proper attenuation values and you should make sure that
the proper attenuation is entered from the channel
’s Vertical setup dialog. Furthermore, the gain entered should be the gain correction applied
to the system with the correctly entered attenuation.
If used with PCF200, enter values manually.