Agilent Technologies 4263B - Using a Guard Plate for Low Capacitance Measurements; Shielding; Example of DUT Guard Plate Connection; Guard Shield

4263B
Using
a
Guard
Plate
for
Low
Capacitance
Measurements
Use
a
guard
plate
to
minimize
measurement
errors
caused
by
stray capacitance
when
measuring
low
capacitance
values
,
such
as chip
capacitors.
See Figure
7-10.
Figure
7-10.
Example
of
DUT
Guard
Plate
Connection
Shielding
Shielding
minimizes
the
eects
of
electrical
noise
picked
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
shown
in
Figure
7-11
.
Figure 7-11. Guard Shield
7-10 Impedance Measurement Basics