Performance Check/Calibration—Type 422 AC-DC
i. CHECK—Marker within 0.15 division (within 7.5%) of
the fourth vertical line.
j. Position the marker nearest the third vertical line
exactly to that line.
k. CHECK—Marker within 0.15 division (within 7.5%)
of the fifth vertical line.
l. Continue this check for each two-division portion of
the displayed sweep within the center eight divisions of the
graticule.
m. INTERACTION—Check steps 45, 49 and 51.
45. Check Variable Time/Division Control Range
a. Set the time-mark generator for five-millisecond mar
kers.
b. Position the first marker to the center vertical line
(see Fig. 5-25A) with the horizontal POSITION control
(use the fine range of the POSITION control for precise
positioning).
c. Push the X I0 MAG switch in.
d. CHECK—First marker within 0.2 division of the
center vertical line (see Fig. 5-25B).
NOTE
This tolerance is provided as a guide to correct instru
ment operation and is not an instrument specifica
tion.
e. ADJUST—Mag Register adjustment, R535 (see Fig.
5-25C) to position the first marker to the center vertical
line.
f. Pull the X I0 MAG switch.
g. Position the middle marker (three markers on sweep)
to the center vertical line.
h. Push the X10 MAG switch in.
i. CHECK—Middle marker within 0.2 division of the
center vertical line.
j. ADJUST—If middle marker is outside the given toler
ance, compromise the setting of the Mag Register adjust
ment for best overall operation in checks d and i.
k. Pull the X I0 MAG switch and repeat parts b through
46. Check Variable Time/Division Control Range
a. Push the X I0 MAG switch in.
b. Set the time-mark generator for 10-millisecond mar
kers.
Fig. 5-25. Typical CRT display showing correct magnified
registration. (A) X10 MAG switch pulled out, (B) X10 MAG switch
pushed in, (C) location of Mag Register adjustment (Horizontal
Amplifier board).
c. Position the markers to the far left and right vertical
lines of the graticule with the horizontal POSITION
control.
d. Turn the VARIABLE TIME/DIV control fully
counterclockwise.
5-31
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