Calibration
Procedure—
465B Service
Adjustment
Procedure
b.
Connect leveled
sine-wave generator
output
to
CH 1 and CH 2 input connectors
via
50
Q
bnc
cable, 10X
attenuator, 50 Q
termination, and dual-input coupler.
c.
Set generator
frequency to 20 MHz and adjust
output for a
6-division display.
d. Set
VERTMODEswitchesforADDonly(pressCH 1
VERT MODE
to
remove CH 1 trace from crt
display).
e.
CHECK—Display is 0.6
division or less (indicates
CMRR of
at
least 10:1 at 20 MHz).
f. Proceed to
part m if the check in
part
e meets the
requirements. If the
CMRR
is less
than
10:1.
continue with
this procedure.
g.
Set VERT
MODE switches to display
CH
1.
h. Set
generator frequency to 50
kHz and adjust
output for a
6-division display.
i. Set VERT MODE switches to
display ADD only.
j.
ADJUST—CH 2 Gain Adjust
(R1882) for minimum
display (best
CMRR).
k. Set
generator frequency to 20 MHz.
I.
CHECK—Display is 0.6
division or less (indicates
CMRR of at least 10:1
at 20 MHz).
m. Press CH 2
INVERT push button to
release;
dis-
connect test setup.
29.
Check
Bandwidth Limit Operation
a.
Set:
20 MHz BW
LIMIT Limited
bandwidth
(button in)
CH 1
AC-GND-DC DC
VERT MODE
CHI
b.
Connect leveled sine-wave
generator reference
signal output to
CH 1 input connector via 50
Q bnc cable
and 50 O
termination.
c. Adjust generator output
amplitude
for a
6-division
display.
d. Increase generator frequency until display is 4.2
divisions.
e.
CHECK—Generator output frequency is 16 to
24
MHz.
f. Disconnect test setup.
30.
Check/Adjust Trigger
View
Centering and
Gain
(R7526, R7439)
a. Set:
A TRIGGER COUPLING AC
A
TRIGGER SOURCE EXT
A
TRIGGER
LEVEL 0
ATIME/DIV 0.2 ms
VERT MODE A TRIG VIEW
b. Connect
the calibration generator standard-
amplitude signal to the A External Trigger input
connector
via a 50 0
bnc
cable. Set
the generator for 0.5 V output.
c.
CHECK—
Display amplitude is 5 divisions
±5%
(5
divisions ±0.25 division) and that display
will trigger
symmetrically within one
division
of
the center horizontal
graticule line when the A
TRIGGER SLOPE is switched
between
+
and
—
.
d.
ADJUST—Trig View Centering (R7526) to
center
the display about
the center horizontal graticule line.
e.
ADJUST—Trig View Gain (R7439) for a
5-division
display.
f.
INTERACTION—Between Trig View
Centering and
Trig View Gain
adjustments. Repeat both for no visible
interaction.
g.
Disconnect the calibration
generator standard-
amplitude signal from the A External Trigger
input.
31.
Check/Adjust Trigger View
Low-Frequency
Compensation (C7505, C7506)
a.
Connect the calibration generator
high-amplitude
output to the
A
External Trigger i nput connector
via
a 50
O
bnc cable. (Check
generator
output to see if
termination is
required.)
@4-38
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