Answer:
In the status bar there are three different possible symbols available for the current compensation state of each Open / Short / Load:
- Dark grey means, that there is no compensation used
- The white symbol is shown, when a compensation over the complete frequency range has been performed and activated
- A blue sign with a dot / spot (not an asterisk) stands for a spot correction. It is only valid for the current working frequency and will turn into grey (no compensation used) as soon as another frequency has been set.
To make this more clear, here are some examples:
After Factory Reset all compensation is disabled (standard after Preset).