Adjustment Procedure-2225 Service
h. ADJUST-X Centering (R736) to position the
spot at the center vertical graticule line.
i.
Disconnect the test equipment from the
instrument.
11.
Check
X
Bandwidth
a. SET:
VOLTSIDIV (both) 50 mV
AC-GND-DC (both) DC
Vertical MODE BOTH, NORM,
and ALT
Trigger SOURCE CH
1
b. Connect the leveled sine-wave generator out-
put via a
504 BNC coaxial cable and a 504 BNC
termination to the CH
1
OR
X input connector.
c. Set the generator to produce an eight-division
horizontal display at an output frequency of 50 kHz.
d. Increase the signal frequency until the hori-
zontal deflection (X-axis) is equal to 5.7 divisions in
length.
e. CHECK-That the frequency is greater than
2
MHz.
f. Disconnect the test equipment from the
instrument.
12.
Check Sweep Holdoff
a. SET:
1
VOLTSJDIV (both)
1
V
AC-GND-DC (both) GND
Vertical MODE CH
1
SECIDIV
1
ms
Trigger SOURCE EXT, EXT
b. Connect the test oscilloscope's
10X probe tip
to the front end of R704
(toward the front panel).
R704 is on the Timing circuit board.
c. Set
HOLDOFF control fully counterclockwise
(MIN setting).
d. Measure the
HOLDOFF time.
e. Rotate the
HOLDOFF control to the fully
clockwise position
f. CHECK-Sweep
holdoff time has increased by
at least a factor of eight.
g. Repeat Parts c through f for SECIDIV settings
of 0.5 ms and
5
ps.
h. Disconnect the 10X probe from R704.
Scam
by
ARTEK
MEDLQ
*
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