INCREMENTAL SHEATH THICKNESS MEASUREMENTS 



357 



Measuring asscMuhly. 



from the measuring electrodes and from the connecting leads can be 

 reduced to insignificant cjuantities. 



As a result of the described circuit configuration, the bridge measures 

 capacitance quantities eciuivalent to direct capacitance, in a particular 

 case where one of two measuring electrodes is grounded. Realization of 

 the grounded direct capacitance measurements is made possible by 

 having within the measuring arrangement a three-electrode system in 

 which stray admittances from the third (ungrounded) electrode to either 



