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Front
P
anel
4339B
UNKNO
WN
T
erminals
These
are
terminals
used
to
connect
the
test
xture
or
test
leads
for
measuring
a
DUT
.
Input
Is
connected
to
the
DUT
.
The
connector
type
is
triaxial,
which
is
congured
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
Conguration
"
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
conrm
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
NO
T
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.
W
arning
Pressing
may
cause
the
4339B
to
output
dangerous
voltage
levels
up
to
1000
Vdc.
Do
NO
T
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
Содержание 4339B
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Страница 55: ...4339B Initial Inspection Figure 1 1 Power Cable Supplied Getting Started 1 11 ...
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Страница 262: ...4339B Figure B 1 Handler Interface Comparison Output Signals Diagram B 2 Handler Interface Installation ...
Страница 263: ...4339B Figure B 2 Handler Interface Control Output Signals Diagram Handler Interface Installation B 3 ...
Страница 268: ...Procedure 4339B Figure B 5 A1 Main Board B 8 Handler Interface Installation ...