Calibration— Type 544/RM544
d. Set the HORIZONTAL DISPLAY switch to NORMAL.
e. Using the HORIZONTAL POSITION and VERNILR
controls, position the display so the end of the swee p
coincides with the 7-cm graticule line.
f. Set the HORIZONTAL DISPLAY switch to XI0.
g. Note the timing error of the display from the 1-cm to
the 9-cm graticule lines; tolerance should be within
±5% or ± 4 mm.
h. Check the timing accuracy of the display between the
4th cm and 80th cm of the sweep. Magnified-timing
in this region must be within ±5% or less. If, in the
20-cm region some non-linearity is observed, read
just C591 to make the sweep more linear.
NOTE
With some time and care spent in making the ad
justments described in steps 29 through 32 as ac
curately as possible, the X I0 magnified sweep tim
ing can be adjusted to ± 5 % or better.
33. Adjust C557K and C557F (X20 and X5 Magnified
Sweep Compensations)— Horizontal Amplifier
a. Set the TIME/CM switch to .2 /tSEC and the HORI
ZONTAL DISPLAY switch to NORMAL.
b. Using the HORIZONTAL POSITION control, posi
tion the start of the sweep to coincide with the 4.5-
cm point on the graticule.
c. Set the HORIZONTAL DISPLAY switch to X20.
d. Adjust C557K (see Fig. 5-2) for 1 cycle every 2 cm.
e. Set the TIME/CM switch to .1 ^.SEC and the HORI
ZONTAL DISPLAY switch to X5.
f. Using the HORIZONTAL POSITION control, position
the start of the sweep to coincide with the 0-cm
graticule line.
g. Adjust C557F (see Fig. 5-2) for 1 cycle per cm just
after the first 2 cm from the start of the sweep.
34. Adjust C557D (X2 Magnified Sweep
Compensation)— Horizontal Amplifier
a. Set the SWEEP MAGNIFIER switch to X2.
b. Adjust C557D (see Fig. 5-2) for 2'/2 cycles per cm
just after the first cm from the start of the sweep.
35. Check X20, X50, and X100 Magnified Sweep
Compensation
Using Table 5-7 as a guide, check the X20, X50, and XI00
magnified sweep compensations. Check for correct tim
ing within a tolerance of ±5% , between the 5% point
from the start of the sweep and the 80% point of the
sweep length.
NOTE
5% point from sweep start can be determined by
setting the HORIZONTAL DISPLAY switch to NOR
MAL and positioning the start of the sweep to coin
cide with the 4.5-cm point on the graticule. Then set
the HORIZONTAL DISPLAY switch to the magnified
sweep-rate being checked.
80% point of sweep length can be determined by
setting the HORIZONTAL DISPLAY switch to NOR
MAL and positioning the end of the sweep to coin
cide with the 7-cm graticule line. Then set the HORI
ZONTAL DISPLAY switch to the magnified sweep
rate being checked.
TABLE 5-7
TIME/CM
HORIZONTAL
DISPLAY
Time-Mark Cycle/Cm
Switch
Switch
Generator
Setting
Setting Output
.2 ^.SEC
X20
50 me
1 cycle/2 cm
.5 juSEC
X50 50 me
1 cycle/2 cm
1 /iSEC
XI00
50 me
1 cycle/2 cm
36. Check .1 mSEC/CM through 5 SEC/CM Sweep
Rates— Sweep Timing Switch
a. Set the time-mark generator for 10-mc sine-wave
output.
b. Set the oscilloscope front-panel controls to these
settings:
TRIGGERING-
MODE TRIG
SOURCE NORM INT
TIME/CM .1 /J.SEC
HORIZONTAL DISPLAY NORMAL
c. Using the oscilloscope HORIZONTAL POSITION and
the TU-7 Vertical Position controls, position the dis
play so the sweep-rate timing can be checked.
d. Starting with the .1 ^.SEC/CM, check each of the Time
Base sweep rates using Table 5-8 as a guide. Toler
ance for the fixed (non-adjustable) sweep rates is
±2% or ± 1 .6 mm.
e. After checking the sweep rates, disconnect the time-
mark generator and interconnecting cables from the
oscilloscope/TU-7 combination.
37. Adjust EXT HORIZ DC BAL R519— (External)
Horizontal Amplifier
a. Set the front-panel controls of the oscilloscope and
TU-7 to the following settings.
Oscilloscope
TRIGGERING LEVEL
Fully cw
MODE
AUTO
SOURCE
EXT
TIME/CM
1 mSEC
HORIZONTAL DISPLAY
EXT
Type TU-7
Vertical Position Centered
Variable
=r3
5-12
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