Performance Check/
Calibration-Type
453/R453
TABLE
5-5
A
and
B Timing Accuracy
A
and
B
CRT
Display
TIME/DIV Time-Mark
(markers/
Switch Setting
Generator
Output
division)
.1
µ,s
0.1
microsecond
l
.2
µ.s
O.
l microsecond
2
.5
µ.s
0.5 microsecond
l
l
µ.s
l microsecond
l
2
µ.s
l microsecond 2
5
µ.s
5 microsecond l
lO
µ.s
l 0 microsecond l
20
µ.s
lO
microsecond 2
50
µ.s
50
microsecond l
.l
ms
0.1
millisecond l
.2
ms
0.1
millisecond 2
.5
ms
0.5 millisecond l
l
ms
l millisecond
l
2ms
l millisecond 2
5
ms
5 millisecond l
10
ms
l 0 millisecond l
20
ms
l 0 millisecond 2
50
ms
50 millisecond 1
. l s
O.l
second
l
.2
s
0.1
second 2
.5
s
0.5 second
l
A
Sweep
Only
l s
l second
l
2s
l second 2
5s
5 second
l
55.
Check A Magnified Sweep Accuracy
a.
Set the
MAG
switch to X l
0.
b.
CHECK-Using the A
TIME/DIV
switch and time-mark
generator settings given
in
Table 5-6, check A magnified
sweep timing within 0.32 divisions over the middle eight
divisions of the magnified display
(within
4%). Note the
portion of the total magnified sweep length to be excluded
from
the measurement. Magnifier light
must
be on.
56.
Check B Sweep Timing Accuracy
a. Set the
MAG
switch to
OFF.
b.
Set the
HORIZ
DISPLAY
switch to
DELAYED
SWEEP
(B).
c.
CHECK-Using the A and B
TIME/DIV
switch and time-
mark generator settings given
in
Table
5-5,
check B sweep
timing within 0.24 division over the middle eight divisions
of the display
(within
3%).
5-36
Fig.
5-38.
Typical
CRT
display when
checking
delayed-sweep
accuracy.
57.
Check B Magnified Sweep Accuracy
o. Set the
MAG
switch to X l
0.
b.
CHECK-Using the A and B
TIME/DIV
switch and time-
mark generator settings given
in
Table
5-6,
check B magni-
fied
sweep timing within 0.32 division over the middle eight
divisions of the magnified display
(within
4
%).
Note the
portions of the total magnified sweep length to be excluded
from
the measurements.
58.
Check Delay-Time Accuracy
a. Set the
MAG
switch to
OFF.
b.
Set the B
SWEEP
MODE
switch to B
ST
ARTS
AFTER
DELAY
TIME.
c.
CHECK-Using the A
TIME/DIV
switch, B
TIME/DIV
switch and time-mark generator settings given
in
Table 5-7,
check delayed sweep accuracy within the given tolerance.
First
set the
DELAY-TIME
MULTIPLIER
dial to 1.00 and rotate
the dial
until
the sweep starts
at
the top of the second
marker (see
Fig.
5-38).
Note the dial reading and then set
the dial to 9.00 and rotate
until
the sweep starts
at
the top
of the tenth marker.
DELAY-TIME
MULTIPLIER
dial setting
must
be 8.00 divisions higher, +
or-
the allowable error
given
in
Table
5-7.
NOTE
Sweep
will
start
at
top
of
third marker
at
1.00,
and
nineteenth marker
at
9.00
for
sweep
rates
which
are
multiples
of
2
(e.g.,
2
µ.s,
20
µs, .2
ms,
etc).
If
in
doubt
as
to
the
correct setting
of
the
DELAY-TIME
MULTIPLIER
dial,
set
the
HORIZ
DIS-
PLAY
switch to A
INTEN
DURING
B
and
check
which marker
is
intensified.
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