Tektronix 544 - Adjust C290 A (.5 -.SEC Sweep-Rate Timing) Sweep Timing Switch; Adjust C299 (.l-^SEC Sweep-Rate Timing) Sweep Generator; Adjust C572 and C582 (High-Speed Sweep Length Compensation)- Horizontal Amplifier

C alib ratio n — Type 544/RM544
b. Check that the TIME/CM switch is set to .1 ,uSEC.
c. Set the TU-7 Variable control so the display is about
4 cm in amplitude.
d. Adjust the TRIGGERING LEVEL control to obtain a
stable display.
e. Adjust the HORIZONTAL POSITION control to posi
tion the start of the sweep to start at the 0-cm grati-
cule line.
f. Set the HORIZONTAL DISPLAY switch to XI0.
g. Check that C576 and C586 |see Fig. 5-8) slug-adjust
ing screws are about six turns above the metal wiper
contacts of the capacitors.
h. Adjust C572 ond C582 (see Fig. 5-8) for maximum
sweep expansion. (Use a low-capacitance alignment
tool when moking the adjustments.)
30. Adjust C591 (High-Speed Sweep Linearity)—
Horizontal Amplifier
Adjust C591 (see Fig, 5-8) for best display linearity of I
cycle per 2 cm.
31. Adjust C576 and C586 (High-Speed Timing
Adjustments)— Horizontal Amplifier
Adjust C576 and C586 in equal increments for best liming
of 1 cycle per 2 cm from the 2-cm graticule line to tho
8-cm graticule line.
NOTE
If best timing cannot be obtained and the sweep
seems too long, readjust C572 slightly to reduce the
displayed gain. If C576 and C586 do not seem to
have enough range, repeat steps 29h through 31.
If repeating the adjustment procedure causes timing
to worsen, C576 and C586 slug-adjusting screws
are probably turned in too far. Try presetting the
C576 and C586 screws about 7 or 8 turns above
the contacts and then repeat steps 29h through 31.
32. Adjust C557H (X10 Magnified Sweep
Compensation)— Horizontal Amplifier
a. Rotate the HORIZONTAL POSITION and VERNIER
controls clockwise so the start of the sweep (or dis
play) can be seen. Locote tho tip of a cycle occurring
40 nsec or more from tho start of the sweep. Position
the tip of the located cycle so it coincides with the
1-cm graticule line.
b. Adjust C557H (see Fig, 5-2) for best timing of 1 cycle
per 2 cm from the 1-cm to 8-cm graticule lines. If
necessory, retouch C591 to obtain best linearity. Re
peat the adjustment of C557H and C591 as mony
times as is necessary for best timing and linearity.
c. Set the HORIZONTAL DISPLAY switch to NORMAL.
Using the HORIZONTAL POSITION control, center
the display. Set the HORIZONTAL DISPLAY switch
to X10. If the timing needs to bo improved, retouch
C572 and/or repeat steps 29h through 32c.
C5I3
C299
CS86
C524
5-11
Fig. 5-8. Calibration adjustment locations (lop right side view).