Operating instructions
Performance
Check
and
Adjustment--"71387
V
.
e
.
CHECK--That
the
repetition
rate
is
2
.048
kHz,
within
the
limits
of
2
.045
to
2
.050
kHz
.
V
B7
.
CHECK
EXTERNAL
CLOCK
INPUT
a
.
Set
the
AQS
CLOCK/AQR
switch
to
EXT/AQR
.
b
.
Connect
a
+5
volt
(0
to
peak),
10
MHz
signal
from
the
pulse generator
to
the
71387
EXT
CLOCK
IN
connector
.
The
frequency
counter
probe
and ground
lead
must
remain
on
TP673
and
TP644
.
J
c
.
CHECK--That
the
external
clock
output
repetition
rate
is
10
MHz
.
B8
.
ADJUST
DELAY
START
AND
PICKOFF
BIAS
(8305,
R530)
a
.
Set the
B
horizontal
time-base
unit
time/div
switch
to
5
ps/div,
and
the
triggering
to
+
slope,
auto,
ac
,
int
.
Set
the
AQS
CLOCK/AQR
switch
to
INT
_
1000,
and
the
TIME/DIV
switch
to
1
ms
.
b
.
Connect
the
time-mark
generator
to
the
amplifier
unit
input
with
a
50-ohm
cable
.
Set
the
time-mark
generator
to
display
0
.2
millisecond
markers
with
an
amplitude
of
about
1-division
.
Align
every
fifth
marker
with
the
vertical
graticule
lines
using
the
71387
POSITION
control
.
c
.
Set the
mainframe
horizontal
mode
to
alternate,
and
adjust
the
intensity
and
focus
for
the
desired
display
.
d
.
Position
the
start
of
the
B
horizontal
trace
to
the
left
graticule
edge
.
Rotate
the
ACQUIRE-STOP
DELAY
control
fully
counterclockwise
.
e
.
Check
that
the
intensified
zone
is
on
the
second
time marker,
and
the
rising
edge
of
the delayed
sweep
marker
is
at
the
start
of
the delayed
sweep
trace
.
f
.
ADJUST---R305
(Delay
Start)
to
position
the
intensified
zone
to
the
2nd
time
marker
on
the
delaying
sweep
trace
and
the
rising
edge
of
the
delayed
sweep
marker
to
the
start
of
the delayed
sweep
trace
.
g
.
Rotate
the
ACQUIRE-STOP
DELAY
control
fully
clockwise
.
h
.
Set
the
time-mark
generator
for
1
millisecond
markers
.
i .
Check
that
the
intensified
zone
is
on
the 11th time
marker
.
j
.
ADJUST----R530
(Pickoff
Bias)
to
position
the
intensified
zone
to
the
11th
marker
and
the
rising
edge
of
the
delayed
sweep
marker
to
5
divisions
(25
/is)
from the
start
of
the delayed
sweep
.
J
PerformanceRequirement
check
;
see
introductory
information
.
5-
1
2
k
.
INTERACTION--Repeat
parts
b
through
j
until
the
intensified
zone
is
on the
2nd
(0
.2
ms)
and
11th
(1
ms)
markers
when
the
ACQUIRE-STOP
DELAY
is
rotated
fully
counterclockwise
and
fully
clockwise
.
B9
.
ADJUST
DVM
ZERO
AND
SCALING
(R550,
R538)
a
.
Set
the
ACQUIRE-STOP
DELAY
control
fully
counterclockwise
.
b
.
Check
that
the
channel
2 readout
indicates
0
.200
Ms
.
c
.
ADJUST----R550
(DVM
Zero)
for
a
channel
2
readout
display
of
exactly
0
.200
ms
.
d
.
Rotate
the
ACQUIRE-STOP
DELAY
control
fully
clockwise
.
e
.
Check
that
the
channel 2
readout
indicates
9
.995
ms
.
f
.
ADJUST-8538
(Scaling)
for
a
channel
2
readout
of
exactly
9
.995
ms
.
g
.
INTERACTION
Repeat
parts
a through
f
until
the
channel
2
readout
indicates
0
.200
ms(ACQUIRE-STOP
DELAY
control
fully
counterclockwise),
and
9
.995
ms
(ACQUIRE-STOP
control
fully
clockwise)
.
h
.
Rotate
the
ACQUIRE-STOP
DELAY
control
to
posi-
tion
the
instensified
zone
on
the
2nd
time
marker
and
position
horizontally
the
rising
edge
of
the
delayed
time
marker
(reference
point)
to
the
first
graticule
line
.
i
.
Progressively
check
each
time
marker
using
the
above
reference
point
and
note
the
readout
count
display
as
shown
in
Table
5-3
.
TABLE
5-3
Delay
Time
Linearity
Within
0
.990-1
.010
1
.985-2.015
2.980-3.020
3.975-4.025
4
.970-5
.030
5
.975-6.025
7.985-8.015
8
.990-9.010
REV
SEP
1983