Agilent Technologies 4263B - Stray Capacitance Causing Contact Check Error

4263B
Contact
Check
T
o
realize
accurate
measurements
and
to
make
the
contact
check function
work correctly
, use
the
following
guide
lines
.
Using
the
four-terminal
pair
conguration,
place
your test
leads as
near as
possible to
the
DUT
.
Minimize
C
HL
and
C
PC
by
arranging
your
test
leads
as
shown
in
Figure
7-12
.
If
C
HL
is
large
,
the
valid
range
of the
contact check
is reduced.
If
C
PC
is
larger
than
about
3
pF
,the
contact check
function may
perceive that
the
DUT
is
connected
even
if
it
is
not.
Figure
7-12.
Stray
Capacitance
Causing
Contact
Check
Error
Impedance Measurement Basics 7-11