Adjustment Procedure-2225 Service
NOTE
In
X5
and
X50
magnification
in
all
"2"
decade
switch settings, the associated time marker set-
tings give only five markers per
10
divisions in-
stead of the customary
10.
When checking
these ranges, position the markers on the sec-
ond and tenth vertical graticule lines.
g. Disconnect the test signal from the EXT INPUT
OR
Z
connector.
h. SET:
SECIDIV
Horizontal MODE
Horizontal MAG
Trigger Source
0.05
ks
MAG
X5
CH 1
i. Select 10-ns time markers from the time-mark
generator. Adjust the Trigger LEVEL control to obtain
a stable display.
j.
Use the Horizontal POSITION control to align the
first time marker that is 50 ns beyond the start of the
sweep with the second vertical graticule line.
k. CHECK-Timing accuracy is within 4% (0.32 di-
vision at the tenth vertical graticule line), and linearity
is within 7% (0.14 division over any two of the center
eight divisions). Exclude any portion of the sweep
past the 50th magnified division.
I. Repeat Parts j and k for the remaining SECIDIV
and time-mark-generator setting combinations
shown in Table 5-4 under the X5 Magnified column.
m. SET:
SECIDIV
Horizontal MAG
n. Select 10-ns time markers from the time-mark
generator.
o. Use the Horizontal POSITION control to align the
first time marker that is 50 ns beyond the start of the
sweep with the second vertical
graticule line.
p. CHECK-Timing accuracy is within 4% (0.32
division at the tenth vertical graticule line), and
linearity is within 7% (0.14 division over any two of the
center eight divisions). Exclude any portion of the
sweep past the 50th magnified division.
q.
Repeat Parts o and p for the remaining SECI
DIV and time-mark generator setting combinations
shown in Table 5-4 under the
XI 0 Magnified column.
r. SET:
SECIDIV
Horizontal MAG
s. Select 10-ns time markers from the time-mark
generator.
t. Use the Horizontal POSITION control to align the
first time marker that is 100 ns beyond the start of the
sweep with the second vertical graticule line.
u. CHECK-Timing accuracy is within 5% (0.40
division at the tenth vertical graticule line), and
linearity is within
9%
(0.18 division over any two of the
center eight divisions). Exclude any portion of the
sweep past the
100th magnified division.
v. Repeat Parts t and u for the remaining
SEC/
DIV and time-mark-generator setting combinations
shown in Table 5-4 under the X50 Magnified column.
I
w.
Disconnect the test equipment from the
instrument.
10.
Adjust
X-Y
Gain
and Offset
(R395, R736)
I
a. SET:
I
VOLTSIDIV (both) 10 mV
SECIDIV X-Y (fully
CCW)
Horizontal MODE
XI
b. Connect a 50-mV, standard-amplitude signal
from the calibration generator via a
50-a BNC coaxial
cable to the CH 1
OR
X input connector.
I
c. ADJUST-X Gain (R395) for exactly a five-
division display.
d. Center the display within the graticule using the
CH 1
POSI-rION control.
e. SET:
CH 1 AC-GND-DC
SEC/DIV
GND
1
ms
f. Align the start of the trace with the first (extreme
left) vertical graticule line using the Horizontal PO-
SITION control.
g. Set the SECIDIV switch to X-Y (fully counter-
clockwise).
Scans
by
ARTEK
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