c • Turn the HORIZCNTALPOSITION knob
CW
until the left end of the display be
comes visible. Now turn the knob a short way
CCW
until the first f e w cycles,
which are obviously nonlinear, are positioned off the left end of the screen.
Check the trace for eight cycles of the sine wave over the middle
8
cm of the
graticule length. Within the middle
8
cm, there should be one cycle of the
sine wave for each centimeter of graticule length, within a tolerance of
±256.
Note: If it is not possible to obtain the results described for this opera
tion, and if parts and tubes in the sweep and sweep-amplifier cir
cuits are good and are properly connected, then the fault probably
lies in the way in which Steps 19 and 32 were carried out, so that
it is wise in case of difficulty to recheck these steps.
To check the horizontal gain.— Settings:
HORIZONTAL DISPLAY— EXT. SWEEP.
SLOPE (toggle)— +.
EXT. SWEEP ATTEN.—
CW,
ATTEN. (toggle)— XI.
5X MAGNIFIER— ON.
Feed 0.2 volt from the calibrator.to TRIGGER OR EXT. SWEEP PI. Position the
sweep on the screen with the HORIZONTAL POSITION control. Length of sweep
should be not less than
1
cm.
Now increase the calibrator output to 2 volts. Adjust EXT. SWEEP ATTEN. knob
for a horizontal deflection of 10 cm. Throw the ATTEN. toggle switch to the
X10 position, and turn the calibrator output to 20 volts. The new horizontal
deflection should be
10
cm
+1
minor division. This procedure checks the cor
rectness of the attenuation ratio of the X10 fixed attenuator.
35. To set DELAY START ADJ and DELAY STOP ADJ.
— Settings:
Main Sweep TRIGGERING LEVEL— CW or CCW.
Main Sweep STABILITY— CW.
TRIGGER SLOPE— +INT
.
Main Sweep TIME/CM— 10 p-sec.
MULTIPLIER— XI.
HORIZONTAL DISPLAY— DELAYING SWEEP.
gX MAGNIFIER— OFF.
Delaying Sweep TIME/CM— gOO psec.
LENGTH— CW.
SLOPE (toggle)— +.
ATTEN. (toggle)— XI.
a. Advance Delaying Sweep STABILITY to obtain trace. Adjust INTENSITY for
"
moderate brightness. Observe that a short brightened region (due to Main
Sweep unblanking) appears on trace. The brightened portion should move
along the trace when the DELAY-TIME MULTIPLIER is turned.
b. Connect VERT. SIG. OUT to TRIGGER OR EXT SWEEP IN. Display gOO-nsec
—
markers from Type !80. Adjust Delaying Sweep STABILITY and TRIGGERING
LEVEL for stable display. Align display with graticule, using HORIZONTAL
POSITION control.
c. Check the registration of the DELAY-TIME MULTIPLIER dial. Dial should
”
read 0,0 when the knob is rotated CCW until stop is reached.
August, 1956
FD-g35-l8