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Model 3580A
GENERAL OPERATING INFORMATION
Section
III
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LINEAR Button: (push
to set;
push
LOG 1
dB
or LOG 10 dB
to release)
Selects Linear
amplitude mode for absolute mea-
surements in rms
volts
or relative measurements in percent
of
full scale. (Paragraph 3-51)
POWER
Switch:
Applies
line
voltage
to
i
nstrument
when set
to
ON (AC) position;
applies
battery power
to Option 001
instruments
when
set to ON
(BAT)
position;
applies
line
voltage to Option
001 instruments to
recharge
batteries
when
set to CHARGE position. (Paragraph 3-192)
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POWER Light: Lights when POWER
switch is set to ON (AC),
ON
(BAT)
or CHARGE.
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STORE
Button: (push
to set; push to release) When initially
pressed,
t
race
currently being
displayed
is
permanently
stored
in
memory. When released,
permanently
stored
trace
is cleared
from memory. (Paragraph 3-160)
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®
BLANK STORE Button: (push to set; push to release) When
pressed,
permanently
stored trace is blanked from the display.
When released, stored trace
returns
to display
.
(Paragraph
3-160)
CLEAR WRITE Button: (momentary pushbutton)
Clears
dis-
play and resets sweep.
FOCUS Control: Focuses CRT trace. (Paragraph 3-158)
ADAPTIVE SWEEP Control: Turns Adaptive Sweep
on or off;
is used to set baseline threshold on CRT display. (Paragraph
3-147)
INTENSITY
Control: Adjusts brightness of CRT trace. Inten
-
sity can be set to any
level
without danger
of
burning
the
CRT
face. (Paragraph 3-158)
Figure 3-1_ Front Panel
(Cont'd).
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®
®
TRACKING OSC
OUT
{1
X-AXIS
Output
:
Female BNC connector supplies de
voltage
correspon
ding
to position of frequency sweep on CRT. Output
voltage
ranges from O V
(left-hand
edge) to
+
5 V
(right-han
d
edge). Output resistance is 1 kilohm, nominal
.
(Paragraph
3-165)
Y-AXIS Output: Female
BNC
connec
tor
supplies
de voltage
proportional to amplitude. Output
voltage
ranges from 0 V
(bottom of screen) to + 5
V
(top of screen). Output resistance
is 1 kilohm, nominal. (Paragraph 3-168)
PEN
LI
FT Output:
A
contact closure
is present
across these
terminals
during
single sweeps. If
Adaptive Sweep
is
used,
the
closure
is
present
only when the instrument
is
sweeping slowly
o
ver
a response. (Paragraph
3-1
70)
Power
Input
Module
:
Accepts
p
ower
cord
supplied
with
instrument. Contains line
fuse
and PC board for selecting line
voltage. (Paragraph 3-193)
EXT TRIG
IN Connector: Female BNC connector accepts
contact closure or TTL logic
levels
to remotely trigger the
frequency sweep.
(Paragraph
3-143)
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LO. OUTPUT: Female BNC connector supplies a 100 mV rms
signal whose frequency
varies
from 1 MHz to 1.5 MHz as the
analyzer frequency
is tui;ied from O Hz to 50 kHz. Output
impedance is approximately 1
ki
lohm.
(Paragraph
3-178)
EXT REF/NORMAL Switch:
In
the NORMAL position, the
tracking
oscillator
receives
its
reference
from
an
internal
100 kHz crystal oscillator.
In
the EXT
REF position,
the
tracking
oscillator reference
is
an external signal
applied
to the
TRACKING OSC IN connector. With the switch in the EXT
REF
position,
the tracking oscillator will
be
inoperative unless
an external reference signal
is
applied. (Paragraph 3-176)
LEVEL Control: Sets the amplitude of the Tracking Oscillator
Output signal (0 V to 2
V
rms).
TRACKING OSC IN: Female BNC connector
.
An external
reference signal can be applied to this connector
to offset or
frequency-modulate
the Tracking
Oscillator Output signal.
(Paragraph 3-1 75)
TRACKING OSC OUT
:
Female BNC connector supplies O Hz
to 50 kHz signal that tracks the tuned or swept frequency
of
the instrument. Output level can be adjusted from O V to
2
V
rms using the rear panel LEVEL control. Output impedance is
600 ohms, nominal.
(Paragraph
3-171)
Figure 3-2. Rear Panel.
3-3
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