Performance Check/Calibration—Type 422 AC-DC
e. CHECK—CRT display for four-division maximum
spacing between markers (indicates adequate range for con
tinuously variable sweep rates between the calibrated
steps).
f. Return the VARIABLE TIME/DIV control to CAL.
47. Adjust 5 Microsecond Timing
PERFORMANCE CHECK ONLY
Complete normal and magnified accuracy of the
TIME/DIV switch is checked in Tables 5-5 and 5-6.
Therefore delete steps 47 through 49 for a perfor
mance check only and proceed to step 50.
a. Set the time-mark generator for five-microsecond
markers.
b. Set the TIME/DIV switch to 5 /us.
c. CHECK—CRT display for one marker each division
between the second and tenth vertical lines of the graticule.
Tenth marker must be within 0.24 division (within 3%) of
the tenth vertical line with the second marker positioned
exactly to the second vertical line.
d. ADJUST—C440A (see Fig. 5-26) for one marker each
division (use low-capacitance screwdriver).
Fig. 5-26. Location of C440A (top).
48. Adjust 0.5 Microsecond Timing
a. Set the time-mark generator for 0.5 microsecond
markers.
b. Set the TIME/DIV switch to .5 (is.
c. CHECK—CRT display for one marker each division
between the second and tenth vertical lines of the graticule.
Tenth marker must be within 0.24 division (within 3%) of
the tenth vertical line with the second marker positioned
exactly to the second vertical line.
Fig. 5-27. Location of high-speed timing adjustments (Horizontal
Amplifier board).
d. ADJUST—C537 (see Fig 5-27) for one marker each
division (use low-capacitance screwdriver).
e. Set the TIME/DIV switch to 1 /us.
f. CHECK—CRT display for two markers each division
between the second and tenth vertical lines of the graticule.
If necessary, compromise the setting of C537 for minimum
timing error in the .5 /us and 1 /us positions.
49. Adjust 0.5 Microsecond X I0 Magnified Timing
a. Set the time-mark generator for 50-nanosecond mar
kers.
b. Change the following control settings:
TIME/DIV .5 [is
X10MAG Pulled out
c. Position the first marker of the total magnified sweep
length to the second vertical line of the graticule.
d. CHECK—CRT display for one marker each division
between the second and tenth vertical lines of the graticule.
e. ADJUST—C511 (see Fig. 5-27) for one marker each
division (use low-capacitance screwdriver).
f. Adjust the horizontal POSITION control so the cen
ter of the total magnified sweep is displayed. If necessary,
temporarily push in the X I0 MAG switch to obtain the
correct position.
g. CHECK—CRT display for one marker each divison
between the second and tenth vertical lines of the graticule
(X I0 MAG switch pulled out).
5-32
To Next Page
Loading...
