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Model 181A/AR
Section HI
Paragraphs 3-1 to 3-16
SECTION Ili
OPERATION
3-1. INTRODUCTION.
3-2.
The Model 181A/AR is a light weight, variable
persistence,
storage oscilloscope using plug-in vertical
-andhorizontal modules.
Both highand low voltage pow-
er supplies,
a calibrator,
the CRT,
and circuitry for
the variable persistence and storage operationare con-
tained in the Model
181A/AR.
A compartment for the
horizontal and vertical plug-ins is locatedinthe lower
portion of the Model 181A and in the right hand portion
of the Model 181AR.
In both models the compartment
is designed to accept the vertical plug-in on the left
side and the horizontal plug-in on the right.
The plug-
in units must be locked together before being inserted
into the compartment(see plug-in manuals).
3-3. OPERATING
CONSIDERATIONS.
instrument.
To avoid CRT damage,
the following pro-
cedure should be followed every time the
instrument is operated.
3-5.
The following are steps that must betakenprior
toapplying power tothe Model
181A/AR Oscilloscope.
-a.
Depress WRITE
push button.
pb.
Set PERSISTENCE
control fully ecw.
c.
Set INTENSITY control fully cew.
d. Apply power to Model 181A/AR
e.
After 3 minutes,
the entire CRT viewing area
should be evenly flooded green.
l
NOTE
If there is no green illumination, turn
instrument off and check all CRT con-
nections.
.
3-6. CONTROLS
AND
CONNECTORS.
3-7.
The location of operating controis andconnectors
is shown in Figure 3-1 together witha brief explanation
of their functions.
Additionai information regarding
some of these controls and connectors is provided below.
3.8.
FRONT
PANEL.
3-9.
FOCUS AND ASTIGMATISM.
These controls are
providedtoassure
uniform
focus of the trace over the
entire CRT screen.
To adjust, set the Presentation
Selector to WRITE,
center a low-intensity spot on the
CRT screen,
and adjust
FOCUS
and
ASTIGMATISM
02612-2
3-10. STORE.
In order to retain whatever is visible
on the CRT, depressthe STORE push button.
The sig-
nal will be stored at reduced intensity,
resulting in a
storage time of greater than one hour.
The INTENSITY,
PERSISTENCE,
FOCUS,
ERASE,
and HORIZONTAL
POSITION controls do not affectthe presentation in the
STORE
mode.
3-13. Several individual waveforms may also be stored,
eventhoughtheyare writtenatdifferenttimes.
Having
storedatrace, for instance,
the operator may choose
to switch backto
WRITE andrecordanothertrace,
etc.,
prior to erasing.
And by turning the Model 181A/AR
power off, as few as one trace a day can be recorded
fora weekor more, dependingontotaltime
instrument
is turned on, as storage time would decrease accord-
ingly.
the display.
Excessive intensity for long duration
may damage the CRT
storage mesh.
The INTENSITY
setting for any sweep
speed should be minimum usable in-
tensity.
3-16. WRITE.
Depressing the WRITE
push button
3-1
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