Operating instructions
Performance
Check
and
Adjustment---7887
b
.
Set the
time-mark
generator
for
10ps
markers
.
Set
the
TIME/DIV
switch
to
10
ps
and
the
companion
time-base
unit
for
a
0
.1
/is/division
sweep
rate
(unmagnified)
.
c
.
Position
the
display
for
1
marker/division
over
the
center
8 divisions of
intensified
display
.
d
.
Position
the
start
of
the
delayed
sweep
to
the
left
graticule
edge
.
Then
set
the
ACQUIRE-STOP
DELAY
control
to
start
the
first
intensified
zone
on
the
second
time
marker,
and
the
rising
portion
of
the
delayed
time
marker
to
the
start
of
the
delayed
sweep
.
e
.
CHECK--That
the
channel
2
readout
indicates
10
.00
ps
within
09
.45
to
10
.55
ps
.
J
f
.
Rotate
the
ACQUIRE-STOP
DELAY
control to
position
the
intensified
zone
on
the 10th
markerand
the
rising
portion
of the
delayed
time
marker
to
the
start
of
the
delayed
sweep
.
g
.
CHECK----That
the
channel
2
readout
indicates
90
.00
us
within
89
.10 to
90
.90
ws
.
V
h
.
CHECK----Follow
the
procedure
outlined
in
parts c
through
g
and
check
the
ACQUIRE-STOP
DELAY
accuracy
as
given
in
Table
5-4
.
,/
1312
.
CHECK
SWEEP
TIMING
NOTE
The
tolerances
given
in
Table
5-5 are
for
an
ambient
temperature
range
of
+15°
to
+35°
C
.
If
outside
this
range,
see
the
Specification
section
for
applicable tolerances
.
a
.
Remove
the
7887
and
plug-in
extenderfrom
the
mainframe
;
then
install
the
7887
directly into
the
B
horizontal
compartment
.
b
.
Set the
POSITION
controls
to
midrange
and
TRIGGERING
MODE
to
NORM
.
V
c
.
CHECK---Using
the
TIME/DIV
setting
and
time-
mark
generator
settings
from
Table
5-5,
check
sweep
accuracy
for
1
time
mark/division
over
the
center
8
divisions
within
the
tolerance
given
in
Table
5-5
.
Set
the
POSITION
controls
and
TRIGGERING
LEVEL
control
as
necessary
for
a stable display
aligned
with
the
vertical
graticule
lines
.
NOTE
If
the
time-mark
generator
used
does
not
have
1-2-5
sequence
markers,
apply
1
unit
markers
in
place
of 2
unit
markers
and
check
for
2
markers/division,
over
the center
eight
divisions
of
display,
to
the
tolerances
given
in
Table
5-5
.
J
Performance
Requirement
check
;
see
introductory
information
.
5-
1
4
_
10
ns
Within
0
.2
div
20VnS_
.
.-
.
.
.
Within
0
.2
div
-
10ns~
_
._20
_ns
.
._
.__
50
ns
1
/is
----
--------- ---
2
/is
5
ps
5 s
TABLE
5-5
Within
0
.12
div
Within
0
.12
div
10
/is
10
ps
Within
0
.12
div
__
.
._
.__- .
._
.___
.__
.__
.__
.__-
.
.__
.__
. .
._
50
ps
50
ps
Within
0
.12
div
.1
ms
1
ms
Within
0
.12
div
Within
0
.12
div
50
ms
Within
0
.12 div
.2
s
Within
0
.12
div
.5
s
Within
0
.12
div
--
.-
W
^ .
~
.
ithin
0
.32
div
-
2~
s
____
.
.^
~
-
e
Within
0
.32
div
---
Within
0
.32
div
J
1313
.
CHECK
MAGNIFIED
SWEEP
TIMING
NOTE
The
tolerances
in
Table
5-6
are
for
an
ambient
temperaturerange
of
+15°
to
+35
°
C
.
If
outside
this
range, see the
Specification
section
for
applicable
tolerances
.
a
.
Center
the
display
horizontally
on
the
graticule
.
Set
the
MAG
switch
to
X10
and
the
SOURCE
switch
to
EXT
.
b
.
Connect
the
time-mark
generator
trigger
output
to
the
EXT
TRIG
IN
connector
with
a
50-ohm
cable
and
50-ohm
termination
.
REV
AUG
1982