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HP 212A - Maintenance; O U T P U T P U L S E a N a L y E L S

HP 212A
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SECTION
IV
MAINTENANCE
4-1
OUTPUT
PULSE
ANALYSIS
The
output
pulse
of
the
Model
2
12A
Pulse
Generator
will
be
divided
into
three
parts:
the
leading
edge,
the
top
or
body,
and
the
trailing
edge.
Each
part
is
affected
by
different
circuits.
If
a
defect
appears
on
apart
of
the
output
pulse,
it
will
generally
indicate
the
circuit
at
fault.
Each
part
of
the
pulse
is
described
separately
and
the
list
of
symptoms
in
the
trouble
shooting
chart
follows
the
same
general
order.
Leadin
Ed
e
--
V6,
the
rstart'
thyratron,
"urns
ont
the
output
pulse.
1
7B
trrggers
V6
and
V6
forms
the
leading
edge
of
the
output
pulse.
?7+--
Only
the
circuits
of
V6
and
V107B
are
responsible
for
the
condition
of
the
leadin
ed
e
of
the
output
pulse.
A
defect
that
appears
on
the
lead-
&uch
as
jitter
and
slowness,
is
the
direct
result
of
a
de
-
F-
ective
tube, crystal
diode,
or
other
component
in
the
circuits
of
V6
and
VlOTS.
See
items
2,3,
and
4
of
trouble
shooting
chart.
Overshoot
--
Overshoot
occurs
to
a
greater
degree
on
the
leading
edge
of
the
pulse
than
on
the
trailing
edge.
Overshoot
greater
than
specified
is
usually caused
by
leads
used
for
external connections
to
the
pulse
generator.
Very
minor
overshoot
coming
from
the
pulse
generator
is
caused
by
com-
ponent
construction,
wiring
and
lead
length
within
the
instrument,
Vl
OA
compensates
for
this
overshoot
on
the
leading
edges
of
both
negative
and
positive
output
pulses.
This
tube
amplifies
a
portion
of
the
rise
time
from
thyratron
V6
and
couples
it
to
the
plate
circuit
of
V11
for
negative
pulses
and
to
the
cathode
circuit
for
positive
pulses.
The
degree
of
com-
pensation
is
controlled
by
adjustable
ceramic
capacitors
C
1
1
and
C22.
The
setting
of
each
capacitor
affects
that
of
the
other,
The
final
adjust-
ment
is
accomplished
by
alternately
adjusting
the
two
capacitors
while
observing
both
positive
andnegative
pulses.
Adjust
for
optimum
pulse
shape.
C11
is
generally
set
near minimum
capacity.
C22
is
used
for
a
greater
portion
of
the
adjustment.
See
item
5
of
the
trouble
shooting
chart.
To of
Pulse
--
When
V6
is
triggered,
it
generates
a
pulse
limited
in
-time plate
voltage
supplied
to
this
tube.
To
protect
Yb,
the
supply
is
constructed to
momentarily
stop
power
delivery
approximate-
ly
11
micraseconds
from
the
time
V6
fires.
V6
is
then
extinguished
and
will
not
fire
until
re-triggered.
The
pulse
generated
by
V6
is
very
coarse
and
contains
peaks
in
excess
of
500
volts.
Clippers
V7
and
V9
clip
the
amplitude
to
between
250
and
350

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