Three-Term & 12-Term Correction; Fundamentals; Requirements - Teledyne T3SP Series Operator's Manual

4. Three-Term & 12-Term Correction

4.1 Fundamentals

In the scope of this manual the three-term correction is abbreviated with
TTC (or DTTC for differential modes) and the twelve-term correction with
12TC. TTC and 12TC are powerful tools to reduce systematic errors of the
measurement system. Activating TTC/12TC leads to a significantly increas-
ing accuracy of the measurement results and is therefore highly recom-
mended to be used whenever applicable. To reduce time and effort for
performing the required TTC/12TC calibration measurements some useful
tools are integrated in the software to simplify and speed up your work.

4.2 Requirements

The fundamental mechanisms of the TTC/12TC are adopted from frequency
domain methods and enhanced with newest TDR data-processing algorithms.
For using TTC/12TC the following requirements must be fulfilled:
1. A calibration kit (open, short, load = OSL) must be available for per-
forming the required TTC measurements. These are available from
Teledyne Test Tools and/or other third party vendors.
2. In addition to the OSL-standards, a thru standard must be available
(OSLT) for applying 12TC calibration.
3. A configuration file containing the coefficients of your specific calibra-
tion kit (e.g. MY_CALKIT.ckd) must be located in the Config subfolder
of the software (e.g. c: Program Files (X86) seunis Config). Please
contact Teledyne LeCroy for further information about how to cre-
ate the CKD-file for your specific calibration kit. If a calibration kit is
shipped with the device, the CKD-file will be pre-installed with the
software.
T3SP-Series Operator's Manual
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