Adjustment Procedure-2225 Setvice
f. Repeat Parts b through e until there is no trace
shift between the fully clockwise and the fully
counterclockwise positions of the CH 2 VOLTSIDIV
Variable control.
g. Return the CH 2 VOLTSIDIV Variable control to
the CAL detent.
3.
Adjust Channel 2 Invert Balance (R83)
a. Position the trace on the center horizontal
graticule line using the Channel 2 POSITION control.
b. Set Vertical MODE switch to CH 2 INVERT
c. ADJUST-Invert Bal
(R83) to set the trace to
the center horizontal graticule line.
d. Set Vertical MODE switch to NORM.
e. Repeat Parts a through d until there is no trace
shift when switching from NORM to CH 2 INVERT.
4. Adjust Vertical Gain
(R145, R195, R112, and
R162)
a. SET:
Vertical MODE CH 1, NORM
AC-GND-DC (both) DC
Trigger SOURCE VERT MODE
Trigger COUPLING DC
b. Connect a
20-mV, standard-amplitude signal
from the calibration generator via a
504 BNC cable
to the CH 1
OR
X input connector.
c. Center the display within the graticule using
the CH 1 POSITION control.
d. ADJUST-CH 1 Gain
(R145) for an exact four-
division display.
e. Move the test-signal cable from the CH 1
OR
X
input connector to the CH 2
OR
Y input connector.
f. Set the Vertical MODE switch to CH 2.
g. Center the display within the graticule using
the CH 2 POSITION control.
h. ADJUST-CH 2 Gain
(R195) for an exact four-
division display.
i.
Repeat Parts b through h until the gain of the
two channels is identical. (You must switch the
Vertical MODE between CH 1 and CH 2 as needed to
view the display.)
j.
Change the generator output to 2 mV, and set
the CH 1 and CH 2 vertical magnification to
XI0 (pull
CAL knobs out).
k.
ADJUST-CH 2 XI0 Gain (R162) for an exact
four-division display.
I; Move the test-signal cable from the CH
2
OR
Y
input connector to the CH 1
OR
X input connector.
m. Set the Vertical MODE switch to CH 1.
n. ADJUST-CH 1
XI 0 Gain (R112) for an exact
four-division display.
5.
Check Deflection Accuracy and VOLTSlDlV
Variable Range
a. SET:
VOLTSIDIV Variable (both) CAL detent
Vertical Magnification (both)
XI (CAL
knobs in)
b. CHECK-Deflection accuracy is within the
limits given in Table 5-3 for each CH 1 VOLTSIDIV
switch setting and corresponding
standard-
amplitude signal. When at the 20-mV VOLTSIDIV
switch setting, rotate the CH 1 VOLTSIDIV Variable
control fully counterclockwise and CHECK that the
display decreases to two divisions or less. Then
return the CH 1 VOLTSIDIV Variable control to the
CAL detent and continue with the
50-mV check.
c. Move the cable from the CH 1
OR
X input
connector to the CH
2
OR
Y
input connector. Set the
Vertical MODE switch to CH 2.
d. Repeat Part b using the Channel
2
controls.
Scam
by
ARTEK
MEDL4
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