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EWLETT
LPAPACKARD
-
CERTIFICATION
The Hewlett-Packard
Cornpany
certifies
that
this
instrument
was
thoroughly
tested
and inspected
and
found
to meet
its
published
specifications
when
it was shipped
from
the
factory.
The
Hewlett'
Packard
Company
f
urther certiftes
that
its
calibration
rneasurements
are traceqble
to
th,e
f,/.
S.
National
Bureau
of Standards
to the
extent
allowed
by the
Bureau's calibration
f
acility.
WARRANTY
AN
D
ASSISTANC
E
All
Hewlett-Packard
products
are
warranted
against
defects
in
materials
and
workmanship.
This
warranty
applies
for one
year
from
the
date of
delivery,
or,
in
the
case of
certain
major components
listed
in the
operating
manual,
for the
specified
period.
We
wilt repair
or
replace
products
which
prove
to
be defective
during
the
warranty
period.
No
other
warranty
is expressed
or
implied. We
are
not
liable
for consequential
damages.
For any
assistance
contact
your
nearest
Hewlett-Packard
Sales
and
Service
Office.
Addresses
are
provided
at the
back of this
manual.
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Section
III
Figure
3-1
Model
413A
U
1.
Power
switch.
Turns instrument
ON.
2. Pilot
Light.
Lights
when instrument
is
ON.
3.
RANGE
(VOLTS)
switch.
For
selecting
voltage
range
desired.
4.
AMPLIFIER
OUTPUT
terminals
(rear
of in-
strument, not
shown).
Provides
an
output
voltage
proportional
to meter
deflection.
5. ZEERO
control.
Used
to
adjust
electrj.cal
zero
setting
of meter.
NORMAL-EXPANDED
switch.
Provides
a
choice
of EXPANDED
(+
end scale)
or a NOR-
MAL
(xL\Vo
end
scale) range
of
zeroadjustmcnt.
INPUT
connectors.
Apply
voltage
to
be
mca-
sured
here
(413A
input is
fully
floating).
Fully
clockwise
position,
indicated
by a dot,
is
used
for
bias adjustment.
6.
t.
B.
3-0
Figure
3-1. Operating
Controls
0r138-2
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NOIT'IS
vtl?
Iapontr
Section
III
Paragraph 3-9
e.
Connect
the
voltage
to
be measured
to the input
connectors.
3-9.
OPERATION
WIfiI A RECORDER.
To
obtain
permanent
records
of 413A readings,
connect a re-
corder to the dc amplifier
output
connector, and
operate the 413A
as
directed
in
paragraph
3-?.
The
Model 413A
output of the
413A amplifier is
l-volt
end scale;
if
necessary,
externally
attenuate
the 413A
output
to
match it
with
recorder
sensitivity. Maximum rated
load
current from the 413A is 1 ma. A load resis-
tance
of less than 1000 ohms may cause the load
cur-
rent to
exceed
1 ma and thus
cause
errors
in meter
indication and amplifier
gain.
l
l
!
I
I
I
I
I
l
T
3-2
01138-1
Section
IV
Figure 4-1
CHOPPER
ASSEMBLY
At03
DSI03
DSIO4
Dsr02
p
Figure
4-1. Model
413A
Block Diagram
I
I
I
I
t]
Model
413A
BD-L-264A
TI
i*
=
RANGE
ATTENUATOR
FI
LTER
MOD.
ASSY.
Ato2
DEMOD.
ASSY.
Aro4
AMPLIFIER
+-NEGATIVE
FEEDBACK
POWER
SUPPLY
c'To
0
nsv
|
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zsov
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d
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01138-3
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Section IV
Paragraphs
4-9
to 4-L2
4-9.
DC
OUTPUT
CIRCU|TS.
4-10. The output from
the demodulator
is filtered
by
CII4-116
and R114-118 and fed
to cathode follower
V1028. Cathode
follower
bias issetbyadjusting
Rl16
Bias
Adjust.
The
output of
V1028 is
used for the
following
purposes:
a.
For meter
deflection. R123
is
used
to adjusr
the meter current to
the correct value.
b. To
provide
a
dc
output
voltage
proportional
to
meter
deflection. This voltage
is available
at the dc
amplifier
output terminals.
c.
For
feedback
to
the modulator
assembly
A102,
and
the
filter network.
The negative
feedback,
adjusted
with R119
Gain
Cal., stabilizes
the dc
gain
of
the
Model
413A
modulator-amplifier-demodulator
system
to a value
of
1111, thereby
providing
an output
of I volt for
an
input of 0.9
millivolts.
4-ll. PowER
suPP[Y.
4-I2,
The 413A
power
supply
is
a conventional
full-
wave
rectifier
with resistors Rl,
R2,
and
zener
diode
CRl in
the
power
transformer
center
tap to
develop
the
-6
to
-7
volts
for
the cathode follower
bias.
Re-
sistor
R8,
ZERO,
adjusts meter zero
by changing
the
dc bias
of the modulator-amplifier-demodulator
net-
work.
Switch 52 changes
Tl
primary
circuit for
230-volt
operation.
A
fuse
of different
ratingmust
be
used in case
of
230-volt operation (see
Table
of
Replaceable
Parts).
4-2
01138-1
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