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HP 4262A User Manual

HP 4262A
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Section
VIII
Model
4262A
Paragraphs
8-11
to
8-14
8-11.
BASIC
THEORY.
important
functions:first,
S1
selects
either
E1
or
E2
as
the
voltage
to
drive
the
four
phase
generator
8-12.
Figure
8-1
is
the
basic
block
diagram
of
the
[this
also
establishes
the
measurement
mode
-either
4262A
showing
mainly
the
analog
measurement
series
or
parallel
which
is
automatically
or
manual-
section.
It
illustrates
how
the
4262A
measures
in-
ly
set
(PARA
or
SER
-
as
selected
at
the
front
ductance
L,
capacitance
C,
resistance
R
and/or
dis-
panel)]
and,
secondly,
S2
selects
either
E1
or
E2
as
sipation
factor
D.
In
this
figure,
the
dotted
lines
the
measurement
voltage
to
charge
or
discharge
the
denote
the
directions
of
control
signals
to
and
integrator
(as
appropriate
to
the
measurement
from
the
nanoprocessor
centered
control
circuit.
function
and
mode
-
i.
e.
Cp,
Cs,
Lp,
Ls,
Rp
or
Rs)
A
measuring
test
signal
from
the
oscillator
is
in
the
Vector
Voltage-Ratio
Measurement
Section.
applied
(at
level
E1)
through
the
source
resistor
to
both
the
unknown
device
and
the
range
resistor
Rr.
The
Vector
Voltage-Ratio
Measurement
Section
Amplifier
Rr
causes
the
same
current
that
flows
calculates
the
measured
value
for
L,
C,
R
or
D
by
through
the
unknown
device
to
flow
through
Rr
ascertaining
the
voltage
ratio
between
E1
and
E2
and
operates
as
a
current
to
voltage
converter.
The
through
a
dual-slope
(type)
analog
to
digital
con-
effect
of
the
Rr
amplifier
is
to
produce
a
voltage
version
technique.
(This
technique
is
popularly
(E2)
equal
in
phase
to
and
exactly
proportional
to
used
in
digital
voltmeters).
The
section
also
pro-
the
current
that
flows
through
the
unknown
device,
cesses
the
E1
and
E2
signal
flow
to
make
the
de-
This
amplifier
drives
the
junction
of
the
unknown
sired
measurement.
Selection
of
either
an
L, C,
R
device and
Rr
to
zero
volts
(virtual
ground);
or
D
measurement
and
an
appropriate
equivalent
thus
Rr
does
not
affect
the
unknown
device
cur-
measuring
circuit
is
established
by
setting
detector
rent.
The
voltage
E2
represents
the
vector
current
phase
reference
and
by
S1
and
S2
switch
operation
which
flows
through
unknown
device
at
test
signal
timing.
The
analog
section
receives
its
measure-
level
E1.
E1
and
E2
completely
define
the
electri-
ment
instructions
from
the
digital
section.
A
de-
cal
characteristics
of
the
DUT
(Device
Under
Test)
tailed
operating
description
of
the
Vector
Voltage-
at
a
given
test
level
and
frequency.
The
details
of
Ratio
Measurement
Section
is
given
in
Paragraph
how
the
measured
values
are
derived
from
the
ratio
8-15.
of
E1
and
E2
are
discussed
in
Paragraph
8-16.
8-14.
Appropriate
values
for
the
source
and
range
8-13.
Voltages
E1
and
E2,
across
the
unknown
resistors,
Ro
and
Rr,
are
selected
with
respect
to
device and
Rr,
respectively,
are
connected
to
se-
the
impedance
of
unknown
device.
In
a
series
lector
switches
S1
and
S2.
These
switches
have
two
equivalent
circuit
measurement
(Ls,
Cs
or
Rs),
the
Vector
Voltage
-
Rotio
Measurement
Section
(AI3,
Al4
Board)
(A1l
Board)
(Al2
Board)
e
thru
€a
eref
s
ar
4
Z
/\/\
—%Ge"e"’m—*%ose
phcse]
4
Arnrunr
eref
|(PLL
cxT)
|4f[Generator]
|
Selector
€,€2,€3
0r
€4
fe
—m___r—i—_
Integrator
r
Phase
Selection/
/
Unknown
\
Device
>
Signal
~
_
Selection
~
\
N
/
oscQ
RR
Amplifier
>
oL
\\
\
/
Phase
!
\
\
\
/
Detector
I
\
!
\
/
\
\
!
\
\
\
\
!
1’
-
oo
-
——
Mo
~
\
I
<
Range
Control
\
\
;
~”
Integrator
Zero
Detector
Ro:
Source
Resistor
_\_\
\\
!
.
_COntro|s
-
RR:
Range
Resistor
__
N
i
_
N
pd
Zero
Signal
Front
Panel
Keyboard
Nanoprocessor
Keyboard
—:>
Control
Centered
Control
Controls
le
l
|
|
i
|
1spiay
Control
Clock
.
.
Display
Display
"
Generator
Digital
Section
(A2,
421,
A22,A23
Board)
Figure
8-1.
Basic
Block
Diagram.

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HP 4262A Specifications

General IconGeneral
BrandHP
Model4262A
CategoryMeasuring Instruments
LanguageEnglish

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