Datapulse 101 - Page 26

l
1
fl
‘lflflflflfl
p.
Turn
the
REPETITION
RATE
selector
to
0.
1
KHz
with
the
vernier
fully
clockwise
and
the
PULSE
WIDTH
selector
to
1.0
MS.
Verify
that
the
repetition
rate
is
100
Hz
for
these
settings
and
less
than
10
Hz
with
the
vernier
fully
counter-
clockwise.
Set
the
REPETITION
RATE
selector
to
10
MHz
with
the
vernier
fully
clockwise,
switch
the
PULSE
WIDTH
selector
to
0.
1
”S
and
turn
its
vernier
fully
counterclockwise.
Verify
that
the
repetition
rate
is
10
MHz
for
these
settings.
If
it
is
not,
trimmer
capacitor
C11
should
be
adjusted
to
get
the
proper
repetition
rate.
C11
is
mounted
on
the
repetition
rate
control
assembly
and
is
accessible
from
the
top
as
a
screw-
driver
adjustment.
NOTE
Use
a
nonmetalic
insulated
screw-
driver
for
this
adjustment.
CAUTION
Be
sure
the
REPETITION
RATE
vernier
is
fully
clockwise
before
adjusting C11.
Turn
the
REPETITION
RATE
vernier
fully
counterclockwise
and
note
that
the
frequency
goes
down
to
less
than
1.0
MHz.
4.
1.4
Pulse
Dela!
Circuit
a. Monitor
both
the
P06
OUTPUT
and
the
REFERENCE
TRIGGER
OUTPUT
using
the
real
time
oscilloscope
with
its
dual
trace
attachment.
Synchronize
the
oscilloscope
to
the
REFERENCE
TRIGGER
OUTPUT.
Set
the
GATE
MODE
switch
to
the
NON-GATED
position,
the
PULSE
MODE
switch
to
SGL
and
the
POSITIVE
AMPLITUDE
to
a
convenient
setting.
Set
both
PULSE
DELAY
and
the
PULSE WIDTH
selectors
to
1.
0
us
with
their
verniers
fully
clockwise.
Turn
the
REPETITION
RATE
selector
to
0.
1
MHz
and
its
vernier
fully
clockwise.
Verify
that
1.
0
microseconds
of
delay
occurs
between
the
refer-
ence
trigger
and
the
positive
output
on
the
scope.
If
not,
R71
(the
delay
calibration
potentiometer)
should
be
adjusted
for
the
correct
delay.
R71
is
near
the
center
of
the
circuit
board,
labeled
DEL
on
the
top
and
accessible
from
the
bottom
as
a
screwdriver
adjustment.
CAUTION
Be
sure
the
PULSE
DELAY
vernier
is
fully
clockwise
before
adjusting
R71.