Operating Instructions—434
ENHANCE LE VEL Provides a selectable increase in
w riting speed capability fo r single
sweep displays. Effective only when
either or both ENHANCE push-
buttons are depressed.
INTEGRATE A pushbutton switch that permits
stora ge o f very fast repetitive
signals by allowing the writing-gun
beam to accumulate charges on the
target while the flood-gun beams
are turned off.
NOTE
The setting o f the ASTIG adjustment should be
correct fo r any display. However, fine adjustment o f
ASTIG fo r a specific INTEN SITY setting may be
desirable.
1. Connect the output of the PROBE CAL 0.6 V 1 kHz
jack to either channel input and set the VO LTS /DIV switch
of that channel to present a three-division display. Set the
vertical MODE switch to display the channel selected.
LOCATE A pushbutton switch that unblanks
the CRT and provides a visible indi
cation of the position of the display
signal while the sweep is held off.
This permits the display to be posi
tioned before storing.
2. Set the TIM E/D IV switch to .5 ms.
3. Adjust the INTEN SITY control to the desired
setting.
Calibrator
PROBE C AL Provides a 0.6 volt calibrator signal
0.6 V 1 kHz to permit probe compensation,
adjustment of amplifier GA IN, and
checking basic horizontal timing.
Power and External Blanking
POWER and A combination control, part of
INTENSITY which is a push-pull switch to
control application of power to the
instrum ent.
4. Set the ASTIG adjustment so the horizontal and
vertical portions of the display are as equally focused as
possible.
Trace Alignment Adjustment
If a free-running trace is not parallel to the horizontal
graticule line, set the TRACE ROTATION adjustment (rear
panel) as follows. Position the trace to the center horizontal
line. Adjust TRACE ROTATION so the trace is parallel
with the horizontal graticule line.
Z A XIS Input connector for external
blanking signals.
GENERAL OPERATING INFORMATION
Intensity Control
The setting of the INTENSITY control should n ot affect
the correct focus of the display. The focusing control is
ganged to the INTENSITY control to provide automatic
adjustment of display focus along w ith adjustment of
display intensity.
The light filte r and optional EMI mesh filte r reduce the
observed light output from the CRT. When using these
filters, avoid advancing the INTENSITY control to a setting
that could cause phosphor damage. When the highest
intensity display is desired, remove the filters. Apparent
trace intensity can also be improved in such cases by
reducing the ambient light or using a viewing hood.
Astigmatism Adjustment
If the CRT display is not well-defined, adjust the ASTIG
(rear panel) as follows.
Graticule
The graticule of the 434 is internally marked on the
faceplate of the CRT to provide accurate, no-parallax
measurements. The graticule is marked w ith eight vertical
and 10 horizontal divisions. Each division is .98 centimeter
square. In addition, each major division is divided into five
minor divisions at the center vertical and horizontal lines.
The vertical gain and horizontal tim ing are calibrated to the
graticule so accurate measurements can be made from the
CRT.
Fig. 2-3 shows the graticule of the 434 and defines the
various measurement lines. The terminology defined here
w ill be used in all discussions involving graticule measure
ments.
Light Filter
The tinted light filter provided minimizes light reflec
tions from the face of the CRT to improve contrast when
viewing the display under high ambient light conditions.
The mesh filter (available as an optional accessory) provides
shielding against radiated EMI (electro-magnetic inter
ference) and also serves as a light filter. To remove either
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2-5
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