Calibration Procedure—
465B
Service
Adjustment
Procedure
17. Check 60 Hz External
Triggering
a.
Set:
B TRIGGER COUPLING AC
CH 1 VOLTS/DIV 10 mV
b.
Adjust the low-frequency generator
for a 5-division
(50 mV) display at 60 Hz.
c.
Set the B TRIGGER SOURCE switch
to
EXT.
d. CHECK—For a stable display,
with
both + and
-
slopes for these modes:
B TRIGGER COUPLING
AC,
HF REJ,
DC
e. Set the B TRIGGER COUPLING
switch to LF REJ.
f. CHECK-No stable display.
g.
Move the
signal cable
from the B External Trigger
input to the A External Trigger input.
h.
Set:
HORIZ DISPLAY
A
ATIME/DIV
5
ms
A TRIGGER COUPLING AC
A TRIG MODE NORM
A TRIGGER
SOURCE EXT
A TRIGGER LEVEL
As needed
i. CHECK—For a
stable
display, with both
+
and
—
slopes for these modes:
A TRIGGER COUPLING
AC, HF REJ,
DC
j.
Set the A TRIGGER
COUPLING switch to LF
REJ.
k. CHECK—
No
stable display.
18. Check
A and B External Trigger Level Ranges
a. Set:
TRIGGER COUPLING
(both)
AC
TRIGGER SLOPE
(both) +
CH
1 VOLTS/DIV
1 V
HORIZ/DI
SPLAY A
A TRIG MODE
AUTO
A TIME/DIV
1 ms
b. Remove
the
50
D
termination and adjust the low-
frequency generator for
a 4-division (4 V)displayat1 kHz.
c. CHECK—Display
is triggered along
the positive
slope of the waveform
as
the
A TRIGGER LEVEL control
is
rotated.
d. CHECK—Display is not
triggered (free runs) at
either extreme
of rotation.
e. Set the A TRIGGER SLOPE switch
to
-.
f. CHECK—Display is triggered
along the negative
slope
of
the waveform
as the A TRIGGER LEVEL control
is
rotated.
g.
CHECK—Display
is not triggered (free runs)
at
either
extreme of rotation.
h. Move the low-frequency
generator signal from the A
External
Trigger input to the B
External Trigger input.
i. Set:
A TRIGGER
LEVEL Fully
counterclockwise
HORIZ
DISPLAY B
DLY'D
j.
CHECK
—Display is triggered
along the positive
slope
of
the waveform
as the B TRIGGER LEVEL control
is
rotated.
k. CHECK—Display
is not triggered (not visible)
at
either extreme
of rotation.
I. Set the B TRIGGER
SLOPE switch to
@
4-49
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