Agilent Technologies 4339B - Page 94

Front
P
anel
4339B
UNKNO
WN
T
erminals
These
are
terminals
used
to connect
the test
xture or
test leads
for measuring
aDUT
.
Input Is
connected to
the DUT
. The
connector type
is triaxial,
which is
congured
as
a center
conductor,
an inner
shield, and
an outer
shield. The
outer shield
is
connected
to
ground,
and
shields the
test signal
from noise
. The
inner
shied,
to
which
nothing
is
connected,
guards the
very low
current signal,
and cuts
the
leakage
current
of
the
contact check
signal. The
center conductor
provides the
test
signal
path.
Ground Is
connected to
chassis ground.
The connector
type
is
a
high-voltage
BNC.
Guard Is
connected to
an ammeter
,which
is
isolated
from
Ground.
This
terminal
is
used
to
setup oating
DUT measurements
,or
the
grounded
DUT
measurements
.
F
or
details,
refer to
\Grounded and
Ungrounded
DUT
Measurement
Conguration"
at later
in
this
chapter
.
The
connector
type
is
high-voltage
BNC.
Output Applies
the source
voltage
.
The
connector
type
is
a
high-voltage
BNC.
W
arning
Do
NO
T
touch
the
UNKNO
WN
terminals
or
the
electrodes
of
the
accessory
,
when
the
High
V
oltage
indicator
is
ON,
because
the 4339B
outputs
dangerous
voltage
level
up
to
1000
Vdc.
Before
handling
the 4339B
or the
accessory
,
turn
OFF
the
test
voltage
pressing
and
conrm
that
the
V
Output
indicator
is
OFF.
High
V
oltage
Indicator
The
High
V
oltage
indicator
shows
that
the
4339B
is
outputting dangerous
voltage
levels
up
to
1000
Vdc
.When
this
indicator
turns
ON,
be
extremely
careful
treating
the
UNKNOWN
terminal
and
test
xture.
Even when
the
V
Output
Indicator
turns
OFF
,
the
High
V
oltage
Indicator
stays
ON
until
the DUT's
Charged voltage
drops
to
a
safe
level.
W
arning
Do
NOT
touch
the
UNKNO
WN
terminals
or
the
electrodes
of
the
accessory
,
when
the High
V
oltage
indicator
is
ON.
V
Output
K
ey
The V output key is
used to apply the test voltage to the DUT or to discharge the DUT
. When
the test voltage is applied, the
V output indicator will turn ON.
Warning
Pressing may cause the 4339B to output dangerous voltage levels up
to 1000 Vdc. Do
NOT touch the UNKNO
WN terminals or the electrodes of
the accessory when the V Output indicator is ON.
Even when the V output key is turned OFF, a charge will remain on the
DUT, especially when the DUT is a capacitor. If the DUT is charged to
a dangerous voltage, the high voltage indicator will stay ON. After the
measurement, handle the DUT only after the high voltage indicator turns
OFF and the DUT has had enough time to fully discharge.
3-4 Function Reference