Horizontal Amplifier Low Frequency Adjustments; Vertical Amplifier Low Fre - HP 1317A Operating And Service Manual

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Model 1317A
f.
Connect digital voltmeter between A5TPI
and chassis ground.
g. Set BRIGHTNESS for + 10V reading on digital
voltmeter.
h. Set INTS LIMIT A13R16 to barely extinguish
a sharply focussed spot.
1.
Connect equipment as shown in figure 5-12.
j.
Set oscillator frequency to 1 MHz and
amplitude for full screen display.
k. Apply 500 output of square wave generator to
Z
INPUT.
1.
Connect monitor oscilloscope to A5TPl.
m.
Set vertical input coupling of monitor oscillo-
scope to dc.
n.
Set monitor oscilloscope controls to view
one square-wave period at A5TP1.
o.
Set square wave generator controls for 100-
kHz, 50-volt output at A5TPl.
p.
Set BRIGHTNESS so that waveform at
A5TPI does not limit.
q.
Set monitor oscilloscope controls so that
waveform just fills vertical graticule.
r.
Set HF ADJ NO. 1 A5C12 for small amount
of overshoot (less than 1%) on leading edge positive
response.
s.
Set HF ADJ
NO.
2 A5R37 for flattest res-
ponse after leading edge transition.
t.
Observe risetime. It shall be less than 20 ns.
u.
If
risetime fails to meet specification, repeat
step q, slightly increasing overshoot.
v.
Repeat steps s, t, and u until risetime specifi-
cation is met with minimum overshoot. Overshoot
must not be increased
to
point where amplifier tends
to oscillate, and in no case, should it exceed 5%.
5-59.
HORIZONTAL AMPLIFIER LOW FREQUENCY
ADJUSTMENTS.
5-60. References. Schematic
1,
schematic
2,
schematic 3, table 5-1, and figure 5-16.
5-61. Procedure.
a. Remove ground strap from digital voltmeter
and connect differentially to horizontal deflection
plates (neck pins on CRT).
Adjustments
b. Set POSITION X for OV reading on digital
voltmeter.
c. Disconnect digital voltmeter common lead
and connect to chassis ground.
d. Set AVERAGE A1R64 for +108V reading on
digital voltmeter.
e. Disconnect digital voltmeter. Replace ground
strap.
f. Turn GAIN
X back and forth between its cw
and ccw positions while observing spot on CRT. Set
BAL A1R11 to minimize movement of spot. Spot
movement shall not exceed 0.3 inch.
g. Set 500/10K switch (on board A5) to 10K.
h. Apply 400 Hz, IV p-p signal from voltmeter
calibrator to
X
INPUT.
1.
Set GAIN
X
cwo
j.
Set GAIN A1R12 for 10 inches deflection on
CRT.
5-62.
VERTICAL
AMPLIFIER
LOW
FREQUENCY
ADJUSTMENTS.
5-63. References. Schematic
4,
schematic
5,
schematic 6, table 5-1, and figure 5-16.
5-64.
Procedure.
a. Remove ground strap from digital voltmeter
and connect differentially to vertical deflection plates
(neck pins on CRT).
b. Set POSITION
Y for OV reading on digital
voltmeter.
c. Disconnect digital voltmeter common lead
and connect to chassis ground.
d. Set AVERAGE A3R64 for + 108V reading on
digital voltmeter.
e. Disconnect
digital
voltmeter.
Replaced
strap.
f. Turn GAIN
Y back and forth between its cw
and ccw positions while observing spot on CRT. Set
BAL A3Rll to minimize movement of spot. Spot
movement shall not exceed 0.3 inch.
g. Set 500/10K switch (on board A3) to 10K.
h. Apply 400 Hz, IV p-p signal from voltmeter
calibrator to
Y
INPUT.
i. Set GAIN
Y cwo
5-15

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