Hughes Products - 104-D - Oscilloscope
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Equipment:
104-D
Date:
1959
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Information
INTRODUCTION.
1-2. The Model 104-D MEMO-SCOPE oscilloscope is a storage
type oscilloscope. In addition to its capabilities for use
as a conventional type oscilloscope, the MEMO-SCOPE
oscilloscope has the feature of being able to retain the
displayed traces of waveforms, and retaining such traces on
the screen for as long as desired (within limits stated in
Section II, OPERATING INSTRUCTIONS).
Thus, non-periodic waveforms, transients, and spurious
signals of a "one-shot" nature can be displayed, and then
retained on the screen of the CRT after they have gone. When
using this feature, the stored display on the MEMO-SCOPE
oscilloscope is much like that of a photograph, holding for
later study information which would ordinarily be difficult
or impossible to visually observe during its actual occurence.
1-3. MEMOTRON TUBE. To accomplish its storage feature, the
MEMO-SCOPE oscilloscope uses a Hughes Products MEMOTRON tube
(RETMA 6498). This unusual tube stores the trace of the
writing beam (the electron beam), and displays this trace
with whatever brightness is required, at a constant
intensity. The trace can be stored indefinitely, with
appropriate voltages applied through selective positioning
of the storage controls on the front panel of the MEMO-SCOPE
oscilloscope.
The MEMOTRON tube thus acts as a CRT with a controllable
persistence: (1) For normal operation as a conventional
oscilloscope, a short persistence may be selected (storage
control off); (2) For storage operation, proper positioning
of the storage controls converts the MEMOTRON tube to a long
persistence tube.
When using the storage feature, the stored trace can be
retained for as long as desired, and then erased by simply
depressing the ERASE button on the front panel of the
MEMO-SCOPE oscilloscope (see figure 1), or by grounding the
external ERASE jack.
1-4. THE STORAGE MECHANISM. The MEMOTRON tube has a
dielectric storage mesh and two electron guns: (1) Writing
Gun; (2) Flood Gun.
The flood gun (figure 2) sprays the dielectric storage
surface with a uniform barrage of low-velocity electrons.
The dielectric surface is assumed to be initially at zero
potential (flood gun cathode potential). The high-velocity
electron beam from the writing gun
charges regions of the storage surface positive as a result
of secondary emission, thus creating areas which are
partially transparent to the flood electrons. Those which
pass through the positively charged areas are accelerated to
high velocity, and strike the viewing screen phosphor,
producing a continuously visible image of the pattern
electrically stored on the dielectric surface.
In addition to providing the electrons necessary for
displaying the written information, the flood gun beam also
maintains the positive and negative potentials of the
charged pattern on the storage surface. This pattern may be
erased by momentarily lowering the voltage on the secondary
collector mesh inserted between the writing gun and the
dielectric surface. A given area on the storage mesh may be
at one of two stable conditions, either at collector or at
flood gun cathode potential. All written information will be
displayed at full brilliance with no presentation of
half-tone information.
1-5. Operation Without Storage: The MEMO-SCOPE oscilloscope
can be used with the storage controls turned
counterclockwise and FLOOD GUN turned OFF, causing it to
operate exactly like a conventional oscilloscope. This mode
of operation (in addition to its obvious use) is very useful
in preliminary adjustments to establish the proper sweep and
amplitude adjustments for later observation of transient
phenomena in the storage mode.
1-6. Beam Intensity: As in any convention&l oscilloscope,
the writing gun intensity must be increased when faster
writing speeds are used. Insufficient beam intensity will
result in partial storage of the trace. Similarly, too high
an intensity for the writing speed being used will cause
"blooming" of the trace, and fogging of the background,
especially at very low writing speeds.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
68
Size:
64.2 MB
Language:
english
Revision:
Manual-ID:
Date:
January 1959
Quality:
Scanned document, reading partly badly, partly not readable.
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Aug. 18, 2017
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