AH2700: Andeen Hagerling capacitance bridge
This is a use case for 'return Done' in read_<parameter>
K2601b: Keithley source meter
Current and Source are two dependend SECoP modules: only
one of them might be active. Writing to target is allowed only
when active, but both values are always readable.
A common SourceMeter bare Module is present for common functionality.
Change-Id: I6f1875298ef928bcc2d60b89560b837139160775
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/22071
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
