Calibration— Type 544/RM544
f. Disconnect the VOM or 10X probe.
g. Disconnect the coax cables, 'T' connector, and set
the AMPLITUDE CALIBRATOR switch to OFF.
17. Check MAG ON and UNCAUBRATED Neons—
Horizontal Amplifier
a. Check that the MAG ON neon is lit when the HOR
IZONTAL DISPLAY switch is set to X2, X5, XI0, X20,
X50, and XI00.
b. Check that the MAG ON neon is not lit when the
HORIZONTAL DISPLAY switch is set to EXT and
NORMAL.
c. Check that UNCALIBRATED neon is lit when the
combined settings of the TIME/CM switch and HOR
IZONTAL DISPLAY switch produces a sweep rate 5
nsec/cm or faster. For example: If the TIME/CM
switch is set to .5/SEC and the HORIZONTAL DIS
PLAY switch is set to XI00, the UNCALIBRATED neon
should light.
18. Adjust X I0 CAL (X I0 Magnified Sweep
Calibration) R544— Horizontal Amplifier
a. Set the Time Base front-panel controls to these
settings:
TRIGGERING LEVEL About 25° clockwise
from 0
MODE
AUTO
SLOPE
+
COUPLING AC
SOURCE NORM INT
TIME/CM
1 mSEC
HORIZONTAL DISPLAY NORMAL
(All the remaining front-panel control settings up ■
this point in the procedure are listed in Table 5-5.
TABLE 5-
5
Oscilloscope
INTENSITY ~ 3
FOCUS ^ 5
ASTIGMATISM =;5
SCALE ILLUM
= 8
TRIGGERING LEVEL
Knob pulled outward
VARIABLE (TIME/CM)
CALIBRATED
Single Sweep Switch
NORMAL
HORIZONTAL POSITION Approximately centerei
VERNIER (HORIZONTAL
POSITION)
Centered
EXTERNAL HORIZONTAL
VOLTS/CM
.1
VARIABLE (EXTERNAL
HORIZONTAL VOLTS/CM)
Fully cw
AMPLITUDE CALIBRATOR
OFF
Type TU-
7
Vertical Position Centered
Variable
Test Function Low Load
b. Apply 100-ju.sec, 1-msec and 5-msec time markers
from the time-mark generator through a coaxial cable
to the TU-7 Ext Input connector.
c. Set the TU-7 Variable control so the display is about
4 cm in amplitude.
d. Center the display vertically using the TU-7 Vertical
Position control.
e. Adjust, if necessary, the TRIGGERING LEVEL control
to obtain stable triggering on the 5-msec time marks.
Fig. 5-6a shows the time markers displayed with re
spect to the graticule markings. Use the HORIZON
TAL POSITION control to position the center 5-msec
time marker to the center of the graticule as shown
in the illustration.
f. Set the HORIZONTAL DISPLAY switch to XI0. Posi
tion the center 5-msec time marker to graticule center
(see Fig. 5-6).
1-
Li
cm 9-
rie L
cm
ie
/
. 1 OO-jttsec,
time mark
>rs
jX e n
. Tin
ter 5-
le Me
msec
rker
L
t
^1 -m
me m
sec
arker
.
II
lit
; Swe ep Ra
fe:
1
msec/
cm
(a) SWEEP MAGNIFIER at XI OFF.
— c
1 1
enter 5-msec _
ime Marker
ime marker as
t -M 1
shown
abov
B
)
; Swec*p Ra
— r—
e: 0.1 mset/cm
(b l SWEEP MAGNIFIER at X10.
Fig. 5-6. Time marker displays.
g. Adjust the XI0 CAL R544 control (see Fig. 5-2) so
there is 1 marker per cm from the 1-cm to 9-cm grati
cule lines. For accurate adjustment the XI0 CAL con
trol should be adjusted so the markers at the 1-cm
and 9-cm graticule lines coincide exactly with the
1-cm and 9-cm graticule lines.
5-8
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