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HP 3580A Service Manual

HP 3580A
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Section III
GENERAL
OPERATING
INFORMATION
Model 3580A
CD
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3-2
LOG
Markings
:
In
the
LOG
10
dB
mode,
these
markings
indicate
signal
amplitude
in
dB
below
full
scale.
Frequency
Markings:
These
markings
indicate
20
Hz,
200
Hz,
2
kHz
and
20
kHz
decade
frequencies
of
log
sweep.
(P
a
ragraph
3-125)
CRT
Display:
(Paragraph
3-158)
LIN
Markings:
In
Phe
LIN
mode,
these
markings
indica
te
signal
amplitude
in
percent
of
full
scale
'(1.0
=
100
% ,
0.4
=
40%,
etc.).
FREQUENCY
Dial:
Indicates
start
or
center
frequency
of
linear
or
manual
sweep.
(Paragraph
3_gg)
START/CTR
Switch
:
When
set
to
START
position,
FRE-
QUENCY
dial
indicates
start
frequency
of
linear
or
manual
sweep;
when
set
to
CTR
position,
FREQUENCY
dial
indicates
center
frequency
of
linear
or
manual
sweeps.
(Paragraph
3-100)
FREQUENCY
Control
:
Tunes
frequency
of
instrument
over
0
Hz
to
50
Hz
range.
Is
used
to
set
start
or
center
frequency
of
linear
or
manual
sweeps.
Push
in
for
coarse
tuning;
pull
out
for
fine
tuning.
(Paragraph
3-96)
ZERO
CAL
Potentiometer:
Used
to
calibrate
FREQUENCY
dial
for
linear
or
manual
sweeps
and
to
set
the
correct
starting
point
for
log
sweep.
(Paragraph
3-102)
BANDWIDTH
Control:
Controls
3
dB
bandwidth
of
IF
Filter.
Is
used
to
select
the
desired
frequency
resolution
.
The
six
BANDWIDTH
settings
are
:
300
Hz,
100
Hz
,
30
Hz,
10
Hz,
3
Hz
and
1
Hz.
(Paragraph
3-80)
FREQ
SPAN
Control:
Determines
width
of
spectrum
to
be
observed
.
Span
settings
range
from
5
Hz
per
division
(50
Hz)
to
5
kHz
per
division
(50
kHz).
(Paragraph
3-103)
DISPLAY
SMOOTHING
Switch:
Provides
three
levels
of
noise
filtering
for
video
presentation.
ADJUST
Indicator:
Lights
to
indicate
that
sweep
rate
is
too
fast.
Will
go
out
when
SWEEP
TIME
is
increased,
BAND-
WIDTH
is
widened
or
when
FREQUENCY
SPAN
is
narrowed
.
(Paragraph
3-137)
SWEEP
MODE
Switch
:
Permits
selection
of
six
sweep
modes
:
REP
(Repetitive).
SING
(Single),
RESET,
MAN
(Manual),
LOG
ZERO
and
LOG
.
(Paragraph
3-113)
MANUAL
VERNIER:
Tunes
analyzer
frequency
and
positions
horizontal
trace
when
SWEEP
MODE
switch
is
set
to
MAN
position.
(Paragraph
3-121)
SWEEP
TIME
Control:
Sets
duration
of
single
and
repetitive
sweeps
.
Settings
range
from
0.01
second
per
division
(O.l
sec.)
to
200
seconds
per
division
(2,000
sec.).
(Paragraph
3-133)
INPUT
Connector
:
Accepts
male,
banana-plug
connector
;
in-
put
impedance
is 1
megohm,
30
pF
.
(Paragraph
3-13)
®
®
@
®
@
@
®
OVERLOAD
Indicator:
Lights
to
indicate
that
input
signal
exceeds
m
ax
imum
input
level
set
by
INPUT
SENSITIVITY
and
amplitude
VERNIER
controls.
(Paragraph
3-37)
Amplitude
VERNIER
:
For
absolu
t e
measurements
VERNIER
mu
st
be
set
to
CAL
(fully
CW)
position
.
For
relative
measurements,
VERNIER
adjusts
gain
of
analyzer
to
establish
a
full-scale
reference.
As
the
VERNIER
is
rotated
counter-
cl o
ckwise,
the
gain
decreases
and
the
full-scale
input
level
increases
.
(Paragraph
3-36,
3-
39)
INPUT
SENSITIVITY
Switch:
Select
s
maximum
(full
scale)
input
level
and
measurement
range.
F o r
absolute
measure-
ments,
full-s
c
ale
settings
range
from
+
30
dBV
/
dBm
to
-
70
dBV
/
dBm
in
Log
10
dB
mode
or
from
20
V
rms
to
0
.2
mV
rms
in
the
Linear
mode
.
In
the
Linear
mode,
seven
additional
ranges
(0.1
mV
to
0.1
µ
V)
can
be
selected
by
the
AMPLITUDE
REF
LEVEL
switch
(Paragraph
3-39,
3-53
and
3-68)
.
With
the
switch
in
the
CAL
position,
the
INPUT
t e
rminal
s
are
disc
o
nnected
and
an
internally
generated
calibra-
tion
signal
is
applied
to
the
input
circuits
(Paragraph
3-
7
7)
.
CAL
10
kHz
Potentiometer:
Adjusts
gain
of
amplitude
circuits
to
compensate
for
slight
variations
in
amplitude
accuracy
caused
by
temperature
changes
or
changes
in
bandwidth
(Paragraph
3
-199).
dBV
/
LIN
-
dBm
Switch:
Set
to
dBV
/
LIN
position
for
mea-
surements
in
dBV
or
rms
volts;
set
to
dBm
600
OHM
position
for
measurements
in
dBm
600
ohms.
For
measurements
in
dBm
/
600
o
hms,
an
external
termination
is
required.
AMPLITUDE
REF
LEVEL
Switch
:
Operates
in
conjunction
with
INPUT
SENSITIVITY
switch
to
establish
full-scale
sensitivity
and
measurement
range.
In
Linear
mode
it
controls
the
IF
attenuation.
When
rotated
in
a
clockwise
direction,
full-scale
sensitivity
increases
in
a
20
V,
10
V,
2
V,
1 V
sequence
(Paragraph
3-55).
In
the
Log
10
dB
mode,
changing
the
Amplitude
Ref
Level
setting
offsets
the
entire
display
in
10
dB
increments
(Paragraph
3-69).
In
Log
1
dB
mode,
the
Amplitude
Ref
Level
control
offsets
the
display
to
select
any
10
dB
portion
of
the
80
dB
range
(Paragraph
3-
7
1).
L OG 1
dB
Button:
(push
to
set;
push
LIN
or
LOG
10
dB
to
release)
Selects
L og 1
dB
amplitude
mode.
Display
sensitivity
is
1
dB
per
division;
display
range
is
10
dB.
Any
10
dB
portion
of
the
80
dB
range
can
be
displayed
by
changing
the
AMPLI
-
TUDE
REF
LEVEL
setting.
(Paragraph
3-71)
LOG
10
dB
Button
:
(push
to
set;
push
LIN
or
LOG
1
dB
to
r
elease)
Selects
Log
10
dB
amplitude
mode
for
absolute
m e
asurements
in
dBV
or
dBm/600
ohms
or
relative
measure·
ments
in
dB
.
Display
sensitivity
is
10
dB
per
division;
display
range
is
80
dB
. (Par
agraph
3-66)
Figure
3-1.
Front Panel.

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HP 3580A Specifications

General IconGeneral
BrandHP
Model3580A
CategoryMeasuring Instruments
LanguageEnglish

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