Agilent Technologies 4339B Service Manual

Analog
Section
Figure
4-3
shows
the
analog
section
block
diagram.
The
4339B
analog section
can be
divided in
two
sections
,
the
dc
voltage
source
section
and the
ammeter section.
The
dc
voltage
source
section
applies
measurement
voltage
to the
series circuit
consisting of
the
DUT
and
I-V
Converter
.
The
DUT
is connected
to the
4339B \Input"
connector by
a triaxial
cable
which
is
a
three
layered
coaxial
cable
.
This
triaxial cable
sheilds external
noise and
improves
the
contact
check
function
accuracy
.
The
current ows
into the
I-V Converter
in
the
ammeter
section
via
the
contact
check
transformer
.
As discussed
in \I-V
Converter", the
I-V
Converter
converts
current
owing
into
to
voltage
ramp
.The
normalization amplier
enhances
the
number
of
measurement
range
and
of
measurement
speed selection
with fewer
range
capacitors
.
The
I-V
converter
output
voltage
slope
, which
is proportional
to the
converter input
current,
is
determined
by
the
dierence
between
two
voltage measurement
results in
a certain
time
interval.
The
result
(current) is
converted to
digital data
by the
ADC,
and
transferred
to
the
CPU
section
by
optical ber
links.
Figure 4-3. Analog Section Block Diagram
Troubleshooting 4-5

Agilent Technologies 4339B Specifications

General

Brand	Agilent Technologies
Model	4339B
Category	Measuring Instruments
Language	English