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Model 1317A
Operation
SECTION III
OPERATION
3-1.
INTRODUCTION.
3-2. This operating section explains the functions of
all external controls and connectors of the Model
1317 A. It describes typical operating modes and covers
operator maintenance and operating instructions for
most applications.
3-3.
INSTRUMENT CAPABILITIES.
3-4. The Model 1317A is designed so that easy
customer-installed modifications adapt the instrument
for a wide variety of applications. Refer to Section
VII
for details.
I
WARNING
I
Dangerous voltages capable of causing
death are present in this instrument.
The following internal adjustments are
outlined in Section V of this manual and
should be made by qualified service per-
sonnelonly.
3-5.
SELECTABLE INPUT IMPEDANCE.
Three manual
switches permit selection of either 50 ohms or 10 kil-
ohms input impedance. One switch is located on
X-
axis Amplifier Assembly AI, another is on Y-axis
Amplifier Assembly A3, and the third is on Z-axis
Amplifier Assembly A5.
3-6. ADJUSTABLE Z-AXIS GAIN AND BALANCE.
These two adjustments are factory set to give optimum
Z-axis operation and have no bearing on calibration of
the instruments after repair or replacement of parts.
Gain adjustment may be set to reduce Z-axis amplifier
gain by a factor of 2.5. Balance control is used to
adjust offset of positive or negative blanking voltage
levels by ±1 V. These adjustments are optional to the
user according to Z-axis voltage inputs and attenuation
factors required by a specific application.
The
phosphor protection
circuit pro-
tects the CRT against a number of
malfunctions.
Unless it is absolutely
necessary to obtain a brighter display
for static or very slow deflection signals,
or if the time constants of the X- and
Y-input signals cause nonuniform inten-
sity, leave PHOSPHOR PROTECTION
switch in the ON position.
3-7.
PHOSPHOR PROTECTION CIRCUIT.
A phosphor
protection circuit is provided which can be enabled
or disabled with an internal manual switch. In opera-
tion, the phosphor protection circuit detects absence
of deflection signals (or slow-speed deflection) and
reduces CRT cathode current to a safe level. When
deflection signals are restored (or speed increased
beyond damage limit), full CRT beam current is also
restored.
3-8.
OPERATOR MAINTENANCE.
3-9. Operator maintenance should be limited to pre-
operational adjustment (figure 3-2) and to exterior
cleaning of the instrument. Occasional cleaning of the
CRT faceplate should be done with alcohol and a soft,
nonabrasive wiping material. Plastic instrument
covers (if used) can be cleaned with any mild house-
hold detergent.
Gliffi
Do not use coarse substances or cleaning
tissues containing glass reinforcing fibers
on CRT filters. The filters are plastic and
easily scratched.
3-10.
CONTROLS AND CONNECTORS.
3-11. Front- and rear-panel controls and connectors
are illustrated and described in figure 3-1.
3-12.
OPERATING PROCEDURES.
3-13. Figures 3-2 and 3-3 contain step-by-step opera-
ting procedures. Index numbers on the illustrations
correspond to step numbers in the instructions. Only
basic techniques are covered. These techniques can
be modified or combined to provide a number of
unique operating requirements.
3-1
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