Agilent Technologies 4284A, Operation Manual

Page: 179 / 460

Capacitance T o Ground
T o measure capacitors of 10 pF or less, the stray capacitance (when
the conductors are grounded, this is capacitance to ground), b et w een
the measuremen t con tacts and the conductors near the capacitor will
inuence the measuremen t, as sho wn in Figure 6-8.
Figure 6-8. Model of Capacitance to Ground
T o minimize the stray capacitance of the test leads, the cen ter
conductor of the test leads should b e k ept as short as p ossible, as
sho wn in Figure 6-9 (A). If four-terminal pair connections are close
to the p oint where con tact is made with the DUT, in terconnect the
shields of the measuremen t terminals to the conductor to reduce the
inuence of the stray capacitance to ground, as sho wn in Figure 6-9
(B).
Measurement Procedure and Examples 6-11