Tektronix 422, Instruction Manual

Page: 124 / 213

Performance Check/Calibration-Type 422 AC-DC
Fig. 5-24. Typical CRT display when checking sweep length.
43. Check Sweep Length
a. Position the tenth marker to the center vertical line
w ith the horizontal POSITION control (see Fig 5-24).
b. CHECK—Sweep length between 10.4 and 12.1 d ivi­
sions as shown by 0.4 to 2.1 divisions o f display to the right
o f the center vertical line (see Fig. 5-24).
44. Check Magnified Timing
a. Set the time-mark generator fo r 50-microsecond mar­
kers.
Fig. 5-23. (A) Typical CRT display showing correct sweep
calibration, (B) location of Sweep Cal adjustment (Horizontal
Amplifier board).
d. ADJUST—Sweep Cal adjustment R512 (see Fig.
5-23B) for one marker each division. The second and tenth
markers must coincide exactly w ith their respective grati­
cule lines (reposition the display slightly w ith the horizon­
tal POSITION control if necessary).
e. Position the second marker to the second vertical
line.
b. Change the follow ing control settings:
X 10M A G Pulled out
Horizontal POSITION Midrange
c. CHECK—CRT display fo r one marker each division
between the second and tenth vertical lines. Marker at tenth
vertical line must be w ithin 0.4 division (within 5%) o f that
graticule line when the marker at the second vertical line is
positioned exactly.
d. Position the first 10-division portion of the total mag
nified sweep onto the viewing area w ith the horizontal
POSITION control.
f. CHECK—Fourth marker w ithin 0.08 division (within
4%) o f the fourth vertical line.
g. Position the third marker to the th ird vertical line.
h. CHECK—Fifth marker w ithin 0.08 division (within
4%) of the fo urth vertical line.
i. Continue this check fo r each two-division portion of
the sweep w ith in the center eight divisions o f the graticule.
j. IN TER AC TIO N —Check steps43 through 53.
e. CHECK—One marker each division between the sec­
ond and tenth vertical lines. Marker at the tenth vertical
line must be w ithin 0.4 division (w ithin 5%) o f th at grati­
cule line when the marker at the second vertical line is
positioned exactly
f. Repeat this check fo r each 10-division portion o f the
total magnified sweep length.
g. Set the horizontal POSITION control to midrange.
h. Position a marker to the second vertical line
5-30