Agilent Technologies 4339B - Page 218

High
Capacitance
DUT
Measurement 4339B
In
addition, T
able 7-3
shows
the
appropriate
resistor
for
each
range
and
measurement
time
mode
.
T
able 7-3.
Appropriate
Output
Resistance
for
Range
Measurement
Range
Measurement
Time Mode
Short Medium Long
100
pA
| 10
M (100
M
1
) 10
M(100 M
1
)
1
nA
10
M
1
M
1
M
10
nA
1
M
100
k
100
k
100 nA 100 k (100 k)
2
(100 k)
2
1

A
(100
k)
2
Short
Bar
3
Short
Bar
3
10
 A
Short
Bar
3
Short
Bar
3
Short
Bar
3
100

A
Short
Bar
3
| |
1
100
M
resistor
is
eective
for
measuring
current less
than 10
pA in
100
pA
range
.
2
Using 100
k resistor
is
recommended,
but
the
response
will
become
slow
.
3
4339B
's
internal
input
and
output
resistance
are
sucient,
so
an
extra
resistor
in
series
is
not necessary
,in
this
range
and
mode
.
Note
Using a
high
resistance
in
series
with
the
DUT
causes
the
charging
time
constant
to
increase
,
thereby
increasing
the
necessary
measurement
time
.
W
arning
Do NO
T
touch
the
electrode
and
UNKNO
WN
connector
while
the
High
Voltage
indicator
is
lit
which
shows
the
4339B
's
output
is
a
high
voltage
levels
up to
1000
Vdc
maximum.
Y
ou
must
operate
after
turning
o
the
voltage
source
output and
you
have
conrmed
the
high
voltage
indicator
is
turned
o.
7-6 Measurement Basics