Sweep Timing Accuracy; Magnified Sweep Timing; Check/Adjust 5 ]1S Timing (C530J); Check/Adjust 0.2 ]1S Timing (C530L) - Tektronix 7B51 Instruction Manual

Performance Check/Calibration-Type 7851
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Fig. 5 ·5 . Typiul CRT display when checking VARIABLE control
range _
14. Check/Adjust 5", Timing (C53OJ)
a. Set the time-mark generator for 5 lJs markers.
b. Reset the Type 7851 TIME/ DIV to 5 lJs, TRIG-
GERING MODE to AUTO, and adjust the LE VEL/SLOPE
for a stable display_
c. CHECK- CRT display for one marker each division
between the second and tenth vertical lines. Check that
sweep timing is within 0.16 division (2%) over the center
eight divisions. See Fig. 5-6.
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Fig. 5 ·6. CRT display showill1l correct 5 j.l1 timing.
5-1 0
d. ADJUST --C503J for one marker each division. The
!l!Cond and tenth markers must coincide exactly with their
respective graticule lines (use the horizontal POSITION
control as necessary to line up display).
15. Check/ Adjust 0.2 ", Timing (C530l)
a. Set the time·mark generator for .1 l.ls markers.
b. Reset the Type 7851 TIME/ DIV to .2lJs.
c. CHECK- CRT display for two markers each division
over the center eight divisions. Check that sweep timing is
within 0.16 division (2%) over center eight divisions. See
Fig. 5-7.
d. ADJUST - C530L for two markers each division . The
markers at the second and tenth vertical lines must coincide
exactly wi th their respective graticule lines (use the horizon-
tal POSITION control as necessary to line up the display).
16. Check Sweep Ti ming Accuracy
a. Using the TI ME/ DIV and time-mark generator
settings given in Table 5-3, check that sweep timing accu-
racy over the center eight divisions of the display is with in
al lowable limits.
17. Check Magnified Sweep Timing
a. Set the Type7851 Magnifier to Xl0.
Fig. 5 ·7. CRT display showing correct .2
j.I$
timing.
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