Adjustment Procedure-2225
Service
c. Set the generator to produce a 1-MHz, five-
division display.
d. Set the top of the display to the center hori-
zontal
graticule line using the CH 1 POSITION control.
e. ADJUST-Compensation
(R241, R240, C256,
C237 and C257) for flattest response. Repeat adjust-
ments until no further improvements are noted.
NOTE
Check your instrument to see if C180 on the
A
1 circuit board is adjustable. If it is, perform
Parts
f,
g,
and h. If it is not, proceed with
part
i.
f. Move the test signal to CH 2 and set the Vertical
MODE to CH 2.
g. ADJUST-CH 2 compensation capacitor C180
to match the CH 2, 10
mV compensation to the CH 1
10
mV compensation.
h. Move the test signal cable back to CH 1 and set
the Vertical MODE to CH 1.
i. Set the CH 1 VOLTSIDIV switch to
5
mV.
j.
Set the generator for a five-division signal.
k. Check for aberrations of
2
6% (0.3 division) or
less.
I. Set the CH 1 VOLTSIDIV switch to 10
mV.
m. Set the generator for a five-division signal.
n. Check for aberrations of
t
4% (0.2 division) or
less.
o. Repeat Part n for each CH 1 VOLTSIDIV switch
settings from 20
mV through 0.2 V. Adjust the gen-
erator output and add or remove the
10X attenuator
as necessary to maintain a five-division display at
each VOLTSIDIV switch setting.
NOTE
Some generators do not produce enough
signal amplitude to do parts p through t.
p.
Set the CH 1
VOLTSIDIV switch to 0.5 V.
q.
Check for aberrations of
?
6%
(0.3 division) or
less.
r. Set the CH 1
VOLTSlDlV switch to 1
V.
s. Check for aberrations of
2
12% (0.6 division) or
less.
t. Repeat Part
s for the 2 V and 5 V CH 1 VOLTS1
DIV switch settirlgs. Adjust the generator output and
add or remove the
10X attenuator as necessary to
maintain a five-division display at each VOLTSIDIV
switch setting.
u. 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.
v. Repeat Parts f through t for Channel 2.
w. Disconnect the test equipment from the
instrument.
15. Check Bandwidth
a. SET:
VOLTSIDIV (both)
Vertical MODE
SECIDIV
Trigger SOLIRCE
5 mV
CH 1
10
ps
VERT MODE
b. Connect the leveled sine-wave generator
output via a
50-fi BNC coaxial cable and a 50-a BNC
termination to the CH 1
OR
X input connector.
c. Set the generator to produce a 50-kHz, six-
division display.
d. Increase the sine-wave frequency until a
4.2-division display is obtained.
e. CHECK-the frequency is greater than 50 MHz.
I
f. Repeat Parts c through e for all ranges from
10
mV to .2 V.
g. SET:
CH 1
VOLTSIDIV 5 mV
CH 1 VOLTSIDIV Variable
XlO (CAL
knob out)
h. Set the generator to produce a 50-kHz, six-
division display.
i. Increase the signal frequency until a 4.2-division
display is obtained.
REV APR
1990
Scans
by
ARTEK
MEDL4
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