Subclasses are used to assign one class to several calibration standards. The procedure of subclass assignment is mainly employed for calibration within a wide frequency range by several calibration standards, each of which does not cover the full frequency range. Each class of standards can contain up to 8 subclasses. The procedure of subclass assignment to the calibration standards is described in Classes of Calibration Standards.
For example, suppose the LOAD standard is defined as from 0 to 2 GHz, and the sliding LOAD standard is defined as from 1.5 to 12 GHz. To perform calibration within the full frequency range, the fixed LOAD should be assigned the subclass 1, and the sliding LOAD should be assigned the subclass 2 of the “load" class.
If the standards have an overlapping frequency range (as in the example above, from 1.5 to 2 GHz), the last measured standard will be used.
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Subclass assignment changes the labels of the calibration softkeys. The measurement softkey is replaced by the key, which opens the subclass menu containing the keys for measuring several calibration standards. |
