Guarding For Low
Capacitance
Measurements
Use a guard plate to minimize measurement errors caused by stray
capacitance when measuring low capacitance values, suchaslow
capacitance chip capacitors. Figure 6-13 shows an example of
measurement contacts using a guard plate in the four-terminal pair
measurement conguration.
Figure 6-13. Example DUT Guard Plate Connection
Shielding
Shielding minimizes the eects of electrical noise pic
ked up by the
test leads. So provide a shield plate and connect it to the outer
shield conductors of the four-terminal pair test leads as sho
wn in
Figure 6-14.
Figure 6-14. Guard Shield
Measurement Procedure and Examples 6-15
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