HP 212A Service manual
PULSE
GENERATOR
SERIALS PREFIXED
:
419
OPERATING AND SERVICING MANUAL
PRINTED
10
-
59
OPERATING AND SERVICING MANUAL
FOR
MODEL 212A
PULSE GENERATOR
Serials Prefixed:
419-
Copyright
275
PAGE MILL ROAD, PAL0 ALTO, CALIFORNIA, U. S. A.
HEWLETT -PACKARD COMPANY
1954
SPECIFICATIONS
PULSE
PULSE
PULSE
AMPWTUDE
INTERNAL
REPETITION
PULSE
LENGTH:
AMPLITUDE:
POLARITY:
CONTROL:
PULSE
SHAPE:
JITTER:
IMPEDANCE:
RATE:
SYNC
SYNC
OUT:
POSITION:
IN:
At
least
0.07
At
least
50
volts
Positive
(a)
(b)
(a)
(b)
Less
50
(a)
(b)
Positive
(a)
(b)
(c)
(a)
(b)
(c)
or
Negative.
50
db
attenuator,
Cantinuoualy variable
Rise
and
(10% to
Crest
variation
than
0.01
ohms
or
less
Internal
External
or
negative,
25
volt5
Duration,
Rise
time,
Delay,
repetition
Delay.
repetition
Advance,
repetition
to
10
microaeconda,
peak
into
variable
decay
time
approximately
90yoo),
less
than f 5%
microseconds.
on
either
~ynchronization,
8
ynchronization,%Z
poaitive
approximately
approximately
0
to
100
rate
0
to
50
rate
0
to
rate
pulse
5
volts
or
15
microseconds
up
to
2500
micraseconds
up
to
5000
10
microseconds
up
to
5000
50
ohm
in
control
polarity.
50
peak
voIte
negative
1
microsecond
0.25
pps.
pps.
pps.
continuously
load
(50
watts
10
db
steps.
with
range
0.02
of
average
to
5,
000
5,
000
pps.
pps.
to
minimum.
into
microseconds.
after
Bync
after
sync
out
after
sync
variable.
peak
J.
of
at
least
microseconds
peak
amplitude.
2,
000
half
pulse
pulse
out
pulse
ohm
voltage
with
at
out
10
load.
with
with
db.
points.
I
I
POWER
ACCESSORIES
CONNECTORS:
SUPPLY:
(a)
(b)
1151230
DIMENSIONS: Cabinet
Rack
WEIGHT:
Cabinet
Rack
AVAILABLE:
@I
AC-16F
AC-E6K
#17
Rack
Main pulse,
Sync
volts
Mount:
Mount:
Mount:
Mount;
Fittings.
End
Mount).
in,
Type
sync
flO70,
20-314"
19"
58
lbs.
50
lbs,
Cable
Assembly,
Cable
xsaembly,
Frames,
out,
50fb0
wide,
with
N.
Type
cps,
wide,
,
shipping
,
shipping
qype
BNC
handles
BNC.
380
12-314''
10-112"
weight
weight
N
to
for
watts
maximum.
high,
14-31
high,
14-314"
approximately
approximately
Male
to
Type
BNC.
bench
use,
16"
N
(for
deep.
deep.
76
73
Male
21ZAR
lbs.
lba.
TABLE
OF
CONTENTS
Page
No.
Section
Section
Section
I
GENERAL
1-1 General 1-1
1-2
LI
OPERATING
1l1
CIRCUIT
DESCRIPTION
............................
Accessory
Inspection
Controls and Terminals
Automatic
Operation
Waveahape
Po~itive
Operation
Operation
DESCRIPTION
General
Rep.RateMV
Delay
Purse
Pulae
Pulse
Pulse
Clipper
Output
Powersupply
Cablem
INSTRUCTIONS
.......................
...........................
Overload
...........................
of
and
Negative
of
Pulse
of
Pulae
Output
Relay
Pulse
Length
Position
................
.............
MV
and
Poeitlon
Forming
Length
Terminating
Amplifier
Blocking
MV
Circuits
MV
and
Thyratron
and
Thyrntron Vl6
............
....a.rn.....
.............
....................
Protection
..............
...................
Pulsa
Output
and
Control
Oscillator
Blocking
Vb
Blocking
Pulse
Levels
Rate
............
Controla
...............
....
Oacillatos
......
O~cillator
.
........
....
1-1
2-1
2-1
2-2
2-2
2-3
2-4
2-4
2-5
Section
SectionV
IV
MAINTENANCE
4-1
4-2
4-3
4-4
4-5
4-6
TABLEOFREPLACEABLEPARTS
OutputPulseAnalyels
Adjuetmenta
Servicing
Thyratron
Replacement
TroubleShaotingChart
..........................
Negative
Replacement
of
......................
High
Voltage
Supply
(V4.
V1Z.
V14.
etc
.....................
Load
Remistor
R7.1
and
R22
.
. .
....................
..................
. ) ....
4
4-1
4-3
2-5
4-5
4-6
4-7
5-1
SECTION
I
1-1
GENERAL
The
Model
ment
change.
The
decay
negative
the
and
able
This
counting
filters
generators,
ACCESSORY
AC-16K:
88/U
for
determining
pulse
repetition
output
from
instrument
produced
with a flat
pulses
attenuator
. 07
circuits,
and
band
RG-58
Type
2
12A
rate,
to
CABLES
BNC
GENEML
Pulse
top
are
10
is
pass
/U
male
Generator
the
by
this
and
available
connected
setting.
microseconds.
applicable
television
circuits
50
ohm
connector.
action
instrument
minimum
and
load,
The
to
systems,
and
coaxial
DESCRIPTION
is
a
fundamental
of
circuits
of
overshoot.
the
pulse
sync
pulse
the
testing
pulse
cable
Overall
under
has
a
shape
condition,
length
of
response
modulation
terminated
length
short
is
radar
of
4Bt1.
measuring
conditions
time
Either
is
continuously
video
of
positive
independent
supply
systems,
amplifiers,
of
UHF
each
end
instru-
of
rapid
rise
-and
of
voltages,
vari
nuclear
signal
with
or
-
UG
-
AC-16B:
UG-88/U
on
the
other
AC-
16D:
U
Type
AC-16C:
2
1B
tor
AC-
UG-21B/U
/U
at
other
E6F:
BNG
Type
RG-58
Type
RG-58/U
BNC
end.
male
/U
Overall
connector.
RG-9A/U
N
male
end.
Overall
RG-9A/U
Type N male
50
ohm
coaxial
male
coaxial
50
connector
50
connector
length
cable
ohm
coaxial
length
ohm
coaxial
connectors.
cable
and
45".
terminated
Overall
cable
and
UG
72".
cable
terminated
dual
banana
one
length
terminated
-23B
Overall
/U
terminated
on
one
plug
(3
end
only
with
4411.
one
end
Type N female
on
each
length
72".
end
with
/4"
center)
WG-881
with
connec
end
with
UG-
-
S
EC
TION
11
2-2
Refer
CONTROLS
PULSE
This
front
SYNC
This
This
ather
+r
This
trols
terminal.
SYNC
The
the
to
terminal
panel.
OUT
terminal
terminal
device
-
toggle
the
IN
SYNC
panel.
the
OUT
polarity
generating
Warranty
AND
is
a
It
is
is
a
provides
for
use
switch,
IN
terminal
A
voltage
circuit.
OPERATING
sheet
TERMINALS
Type
the
output
BNG
a
with
on
the
of
the
is4a
can
in
N
jack
connection
terminal
voltage
the
panel
synchronizing
BNC
be
fed
INSTRUCTIONS
this
manual,
located
on
to
Pulse
above the
connector
into
at
for
the
synchronize
Generator.
voltage
this
the
the
lower
SYNC
on
terminal
lower
main
right
an
OUT
fed
the
right
pulse.
side
of
osciLloscope
terminal,
to
the
SYNC
lower
to
left
trigger
corner
the
side
the
of
panel.
or
con-
OUT
of
pulse
the
SYNC
The
pulse
chronization
sync
PULSE
The
PUlSE
poaition
loscope
PULSE
The
panel,
per
SELECTOR
SELECTOR
SYNC
rates,
pulses.
POSITION
PULSE
OUTPUT
the
has
RATE
PULSE
adjusts
second
SELECTOR
and
also
from
either
POSITION
and
the
main
been
RATE
in
switch.
pulse
synchronized
control,
the
repetition
conjunction with
knob
selects
control
selects
positive
SYNC
on
an
located
rates
two
ranges
necessary
or
negative
adjusts
the
OUTPUT
oscilloscope
with
the
SYNC
on
the
of
the
the
X1
and
circuitry
externally
timing
pulse.
screen
OUT
upper
pulse
X10
from
position
of internally
for
external
generated
between
Its
main
when
left
pulse.
hand
50
of
the
to
the
generated
syn-
the
MAIN
use
is
to
oscil-
side
of
the
5000
cycles
SYNC
PULSE
The
and
WIDTH
PULSE
controls
WIDTH
the
AMPLITUDE
The
AMPLITUDE
PUT
pulse.
ATTENUATION
The
ATTENUATION
provides
of
pulse
attenuation
output can
POLARITY
The
POLARITY'control
the
polarity
FUSE
The
fuseholder,
4
ampere
power
replaced
transformer
of
cartridge
by
unscrewing
width
the
on
control
of
control
control,
of
the
be
obtained.
MAIN
the
panel
fuse.
is
connected
is
the
the
MAIN OUTPUT
gives
located
Main
at
the
lower
OUTPUT
next
A
2
ampere
the
fuseholder
large
a
continuous
an
pulse
right
pulse
to
the
for
230V
dial
the
in
10
hand
from
POWER
fuse
should
operation.
cap
and
at
the
center
pulse.
variation af
right
db
hand
steps
side
positive
ON
be
inserting
so
of
switch,
used
The
of
the
side
that
the
panel
to
negative.
fuse
a
new
the
panel
MAIN
of
the panel,
low
levels
switches
contains
when
the
may
fuse.
OUT-
a
be
2-3
AUTOMATIC
An
overload
thyratron
Operation
when
sufficient
sition
then
The
1.
place
Model
Plug
line
when
Allow
2.
if,
the
instrument
warm-up
without
the
and
the
of
the
21ZA
several
SELECTOR
unit
can
3.
allow
Connect
This
about
connection
OVERLOAD
relay
for
the
any
relay
any
external
is
incorporated
reason,
is
is
and
instrument
Pulse
power
turn
swftch
in
be
used
ten
the
equipment
on
Generator
cable
the
is
minutes
the
t
after
minutes
should
RELAY
continuous plate
indicated
first
turned
turning
the
triggering
in
normal
into
a
nominal
toggle
on.
or - position
switch.
)
for
the instrument
2
or
3
warm
to
be
be
made,
PROTECTION
in
the
instrument
by a buzzing
on,
it
may
SYNC
operating
is
operated
SELECTOR
for
two
115V,
(The
and
with
minutes
up
driven
of
warm
time
if
if
to
the
possible,
current
sound,
indicate
or
three
condition.
as
follows:
50
to
pilot
possible.
to
warm
no
lamp
sync
up,
PULSE
through
to
protect
conduction
If
this
that
there
to
the
+
minutes
60
cycles
should light
up
with
in,
Although the
it
is
desirable
OUT
terminal.
a
nominal
the
@
occurs.
occurs
is
in-
or
-
po-
should
power
the
SYNC
45~
to
50
ohm
The
proximately
50
If
the
of
20
ated
from
true
set
OUTPUT
ing
The
SYNC
minals
be
switched to
should
dial
then
control
on
by
to
be
set
be
the
oscilloscope
means
give
cable.
output circuit
50
ohms
for
in
on
to
set
is
the
is
not
overall
to
30
megacycles,
in
a
non-inductive
the
load
when
the
full
output.
source
an
imperfect
OUT
an
set
the
then
of
terminal
oscilloscope
select
to
either
desired
to
select
adjusted
the
AMPLITUDE
desired
of
the
Model
ohms
absolutely
system
which
se
termination
necessary
is
sensitive
the
50
ohm
may
cause
ATTENUATION
Under
impedence
output
may
the
best
the
repetition
the
pulse
until
screen.
these
cable
be
and
the
performance.
XI
or
width
the
The
CONTROL
output
level.
212A
is
of
fox
to
frequencies
output
is
connected
cable
load
to
ringing.
and
OUTPUT
conditions
less
than
termination
polarity
the
X10
position,
rate,
The
desired
pulse
amplitude
appears
arrd
terminated
the
output
many
should
prevent
This
controls
the
50
ohms
at
to
the
synchronizing
of
the
SY
The
SYNC
PULSE
and
the
at
of
the
the
OUTPUT
with
ap-
cable
measurements.
on
be
reflections
is
especially
Model
thus
the
NC
with
the
order
termin--
are
Z12A
result-
source
OUT
SELECTOR
and
the
PULSE
WIDTH
PULSE
the
desired
pulse
dial
POSITION
can
be
ATTENUATOR
end,
ter
signal
may
position
adjusted
-
may
RATE
2-5
Do
than
5000
seconds
2500
must
creased
position
WAVESHAPE
The
output
and,
in
operating
erator
the
generator
the
internal
condition
attenuation
pulse
general,
conditions
is
operated
impedance
may
is
not
set
the
50
micreseconds
cps
is
used.
may
be
cps,
be
OF
and
be
increased,
Above
decreased
so
as
circuit.
OUTPUT
from
the
the
waveshape
of
the
at
zero
an
unterminated
of
corrected
CAUTION
PULSE
Maximum
used
2500
as
not
to
overload
PULSE
Model
Pulse
attenuation,
the
generator
by
properly
the
internal
POSITION
when
for
cps
the
2
is
Generator.
a
repetition
the
repetition
1
ZA
has
quite
with
load,
impedance
delay
repetition
delay
maximum
the
tubes
extremely
independent
of
1015
rates
rate
to
greater
rate
micro-
up
delay
is
in
the
of
However,
a
length
reflections
being
terminating the
less
of
may
than
approaches
I
of
to
in-
pulse
good
wave
the
when
cable between
occur
50
ohms.
cable,
load
50
shape
and
the
due
As
ohms,
the
gen-
to
This
the
The
waveshape
bout
50
control,
is
desired,
and
operate
as
possible.
The
AMPLITUDE
the
circuit,
put
terminals
of
the
AMPLITUDE
put.
to
imum
Unless
operate
position.
volts
the
is
of
waveshape
it
is
the
there
into
this
the
unit
little deterioration
best
output.
preferable
with the
As
the amplitude
deteriorates
to reduce the
AMPLITUDE
control
will
a
50
control
additional
with
In
some
with
is
be
at
ohm
will
output
the
AMPLITUDE
cases
the
AMPLITUDE
AMPLITUDE
slightly
control
not
calibrated, but,
least
load.
give
the
as
50
volts
On
appreciably
is
absolutely
pulse
control
is
reduced
and,
output
close to the
peak
most
units,
control
output
control
set
to
provide
with
the
AMPLITUDE
if
the
best
waveshape
level
available
necessary, it
with
the
50
volts
with
no
attenuation
from
the
maximum
more
than
SO
slightly below
attenuator
position
the
position
volts out-
is
desirable
the
waveshape will show
at
full
maximum.
a-
in
out-
max-
a
2-6
2-7
POSITIVE
The
positive
equal
panel.
same
plitude
OPERATION
The
pulse
10
microseconds.
is
convenient
tures
adjustable
between
output
With
a
can
this excellent flexibility
little
be
pulse
tained
it
is
desirable
the
pulse
tion
in
AND
and
and
either
These
value
and
between
OF
length
for
of
this
instrument.
pulses involves
two
larger
pulse duration,
sacrifice
expected
lengths
from
where
time
length to
the
pulse
drogen thyratron
the
equipment,
there
age
behind
may
over
the
be
a
period
main
some
NEGATIVE
negative
can
be
outputs,
it
is
normal
the
positive
PULSE
is
adjustable
This
a
great
time
in
absolute
to
be
correct
considerably
to
time.
to
use
some
the
length
tubes
some
change
change
of
time.
pulse
PUUE
pulse
selected
however,
that
and
LENGTH
from
continuously
many
applications
The
generation
a
differential operation whereby
periods
in
accuracy.
within
Where
sort
correct
is
used
the
in
in
in
value.
variation
the equipment,
pulse
the
Controls
dial
so
that
OUTPUT
outputs
by
cannot
there
negative
AND
are
means
be
will
PULSE
less
adjustable
is
used
to
the control
In
f
10
percent
more
accurate
of
pulse
the
variation
an
auxiliary
One
in
length
length calibration
are
pulse
LEVELS
adjusted
of
the switch
expected
be
output
than
.
and
of
these very
control
of
general
a
position.
RATE
07
the
to
to
little
of
a
feature
is
one
the
pulse
the
except
in
the
be
have
difference
CONTROLS
microsecond
of
short,
actual
output,
pulse
for
length
pulse lengths
calibrating
of
the
main
causes
the characteristics
As
tubes
will
be
obtained,
provided
length
on
the chassis
calibration
approximately
on
the
front
exactly
in
in
the
Model
the
useful
continuously
the
diff
time
there
length
very
short
may
are
necessary,
means
of
varia-
of
the
are
changed
and
as
the
tubes
just
can
the
am-
to
2
fea-
esence
of
the
control
be
to
set
hy;
in
also
be
reset
1
is
ob-
ZA
from
the
The
except
sate
The
the
in
it
The
5
it
use
ing
time
adjustment
length
is
internal
range
general,
is
preferable
Model
volt
amplitude
is
desired
a
wave
voltage.
Square
for
a
sine
It
is
important
of
5000
by
the
duty
petition
have
a
to
of
that
the
changed
repetition
from
hold
2L2A
to
shaper
Wave
wave
cycles
cycle
rate
at
time-of
time
of
the
pulse
if
necessary.
these
main
pulse
length
especially
50 to 5000
within
to
use
an
can
be
and a rise
synchronize
of
some
The
unit
synchronizes
Generator.
input
that
/sec.
the
-rise
is
the
Performance
of
the
low
in
the
See
controls.
is
essentially
will
tend
above
rate
cycles
f
2
570,
external
repetition
generator
/set.
but
when
oscillator
synchronized
time
in
the
from a sine
sort
to
increase
very
Another
show
Model
in
Figure
212A
typical
not
at
thyratrons,
frequency
order
end
of
one
Section
to
change
is
IV,
independent
rates
a
rnultivibrator
Calibration
accurate
to
from
external
order
wave
of
the
well
waveshaper
2-1.
be
driven
this
end
There
is
provided
or
two
Maintenance,
of
the
slightly
of
repetition
drive
a
microsecond
source,
rise
from
at
of
the
practically
the
microseconds,
as
the
1
kc.
adjustable
of
this
cohtrol should,
rates
the
pulse
pulses
time
an
a
pulse
range
synchronizing
having
it
is
necessary
of
@
Model
which
is
no
the
may
rate
limit
regarding
other
repetition
controls
over
are
generator.
at
or
two. If
synchroniz-
21
1A
be
in
excess
limited
to
pulses
desired,
least
a
to
used
mainly
the
re-
2-8
Since
widths,-
rates
the
have
and
OPERATION
The
around
of
the
unit
there
especially
pulse
width
been
for
most
PULSE
the
the
sync
incorporated
purposes
OF
POSITION
SYNC
out
approximately
use
is
to
position
position
dition
ing
will
is
normal
conditions.
tend
is
limited
is
a
tendency
when
is
at
the
the
in
they
PUISE
control
OUT
by
100
and
See
timing.
approximately
microseconds.
the
main
to
be
affected
should
important
by
duty
for
the
repetition
maximum
the
unit
are
not
POSITION
is
This
pulse
to
cause
precaution
cycle
at
amplitude
rate
value.
to
minimize
serious.
CONTROL
designed
control
10
microseconds
This
on
an
oscilloscope
some
no
serious
high
repetition
to
is
above
However,
these
to
adjust
will
control
extent
by
difficulty
given
be
affected
1000
the
set
or
is
not
screen.
the
at
the
rates
and
by
cycles/sec
compensating
amplitude
main
the
after
main
the
pulse
pulse
calibrated
This
pulse
under
end
rate.
normal
of
paragraph
long
pulse
repetition
and
when
circuits
variations
timing
ahead
sync
as
out
its
by
main
pulse
This
con-
operat-
2-4.
12AXT
OR
6SL7
WF
-
TO
SYNC
IN
Schematic
Wiring
Diagram
Fig.
of
2-1
a
Typical
Wave
Shaper
SECTION
ZIL
3-2
GENERAL
The
Model
triggering
generating
rear
eratin'g circuits
cuits
diagram
the
deck.
are
following
REP.
This
a
V103B
pulse
The
operated
free
5000
may
section
multivibrator.
to
repetition
running
pulses
be
212A
circuits
circuits,
The
located
and
the
circuit description.
RATE
in
MV
of
conjunction
the
input
either
condition
per
externally
CIRCUIT
Pulse
block
are
to
schematic
the
The
of
rate
free
second
Generator
which
and
diagram
shown
the
circuit
amplifier
with
the
multivibrator
running
it
triggered up
DESCRIPTION
consists
are
located
the
power
of
the
in
Figure
left
of
the
thyratrons
wiring
consists
tube
switch
multivibratoP.
generates
or
in
S102A
consists
or
triggered
the
externally
to
5000
in
the
supply
triggering
3-1.
diagram
of
an
V103A
are
pulses
pulses
of
three
front
which
A11
V6
will
amplifier,
and
used
of
tube
by
an
at
the
basic
deck,
are
and
of
the
and
both
the
phase
to
deliver
V104AB
external
repetition
synchronized
per
second.
parts,
the
main
located
main
triggering
V16.
be
phase
pulse
This
referred
inverter,
inverter
a
and
pulse.
rate
condition
the
pulse
in
the
gen-
cir-
block
to
in
tube
negative
may
be
In
the
of
50-
it
and
3-3
When
that
The
multivibrator
DELAY
Tube
from
to
The
ing
The
supplied
reversing
the
it
generates
pulses
MY
VlOlAB
the
repetition
produce
trailing
oscillator.
blocking
to
rnultivibrator
switch.
a
pulse
generated
and
the
AND
a
BLOCKING
is
employed
positive
edge
of
rate
the
oscillator
the
sync
out terminals
is
externally
only
when
by
this multivibrator
pulse
position
OSCILLATOR
as
a
"one
multivibrator
15
microsecond
15
microsecond
tube
V102B
synchronized,
triggered
multivibrator.
shot1'
by
are supplied
multivibrator,
triggers
forms
of
the
pulse
which
pulse
instrument
the
then
sync
the
the
is
triggers
out
it
is
biased
external
to
delay
multivibrator
inverted
pulse
through
pulse.
the
The
by
the
which
a
so
delay
pulse
VlOZA.
block-
is
polarity
3-4
PULSE
The
pulse
brator
brator.
this
multivibrator.
able
resistor
The
blocking
the
pulse
ing
oscillator
ing
oscillator
crystal
from
cathode
the
POSITION
position
which
A
positive
is
R132.
oscillator
length
is
to
rectifier
delay
to
grid
MY
AND
multivibrator
triggered
pulse
The
tube
multivibrator
a
cathode
the
delay
CR104
line
and
being
capacity
BLOCKING
by
the
2
to
ll2
duration
V
106B
and
follower
line,
a
resistor
fed
to
of
V107B.
OSCILLATOR
tube
V105AB
pulse
In
from
microseconds
of
this
forms
the
delay
tube
series
the
pulse
the
line.
VlO7B
with
R152
the
blocking
is
also a one
repetition
in
length
is
controlled
pulse
which
Following
which
the
which
couples
grid
prevent
oscillator
shot
rate
is
produced
by
is
supplied
the
the
of
this
reflections
circuit
rnultivi-
multiviÂthe
vari-
block-
block-
tube
is
due
to
by
to
a
the
3-5
3-6
PULSE
Tube
LZ
plied
draws
voltage
When
lator
tube
V2, which
are
used
to
excessive
to
the
and
is
fired,
voltage,
line.
10
the
action
the
The
PULSE
The
V
brator
PULSE
The
rnicroseconda
open
limits
cathode
damping
LENGTH
positive
107A.
consisting
LENGTH
FORMING
is
to
charge
the
pulse
the
grid
pulse
delay
until
forming
line
it
will
the
pulse
end
of
the
the
resistor
diode
pulse
The
negative
THYRATRON
normally
the
pulse
forming
current,
of
will
continue
conduction
forming
due
line
tube
R13.
tube
MV
AND
from
of
V108A
control
thyratron
then
the
tube
line
trigger
line
to
a
reverse
and
conduction
V3
BLOCKING
the
pulse
(R142).
Vb
connected
forming
the
V2
thereby
is
charged,
the
to
carry
is
quenched
causes
is
reflected
and
is
used
blocking oscillator
from
and
V107A
V108B.
as
a
diode,
line
Vb.
If
for
relay REL-1
stopping
a
pulse
thyratron
current,
by
means
the
plate
polarity
transient
back
forms
to
damp
OSCILLATOR
a
out
triggers
The
pulse
and
so
that
any
reason
applies
the
from
tube.
irrespective
of
voltage
to
the
starting
10
microsecand
any
negative
Vl
ObB
the
length
the
plate
a
large
flow
the
blocking
Once
the
pulse
to
fall
which
is
inverted
pulse
is
charging
voltage
the
thyratron
choke
is
negative
of current
oscil-
the
thyratron
of
the
grid
forming
to
zero
travels
point.
pulse
down
This
across
overshoots.
by
length
varied
multivi-
by
ap-
to
V6.
after
to
tube
the
The
trailing
blocking
on
to
the
edge
of
oscillator
thyratron
the
negative
V109A.
V16
through
The
the
pulse
output
cathode
from
of
the
the
multivibrator
blocking
follower
oscillator
tube
V109B.
triggers
is
the
passed
3-7
PULSE
The
pulse
When
presents
ratron
fired,
TERMINATING
a
V6
from
and
this
very
tube
V109B
thyratron
low
impedance
causes
THYRATRONVlb
a
rapid
triggers
in
conjunction
to
fall
the
of
the
the
pulse terminating
with the
pulse
pulse
from
to
the
form
thyratron
discharge
pulse
the
forming
trailing
diode
edge.
Vlb.
V8
thy-
3-8
3-9
Additional
allows
set
the
the pulse terminating thyratron
to
a
very
thyratron
CLIPPER
The
pulse
pers
clipper.
OUTPUT
The
plus
attenuator
and
output
or
minus
then
Tube
AMPLIFIER
Intermediate
TUDE
This
grid
ode
control
control
bias
and
voltage
direct
low
V16
current
value.
to
CIRCUITS
from
the
to
the
V9
amplifier
is
pulse
is
then
used
values
which
consists
plate
on
the
two
voltage
Tube
be
extinguished
thyratron
output
the
tube V11
may
a£
has
of
voltage
amplifier
second
be
selected
to
reduce
amplitude
a
continuous
two
ganged
on
clipper
is
supplied
to
V8
in
conjunction
at
the
is
sent
through
tube
and third diode
feeds
the
and
the
pulse
may
polarity
be
range
variable
the
output
tubes
V7
and
to
fire
when
end
of
a
series
V
11.
applied
10
db
selected
of
more
resistors
amplifier
V9.
Vlb
by
the
with
the
Tube
clipper.
switch
to
the
steps.
by
tube
means
pulse
R10
and
pulse
of
three
V7
is
where
attenuator.
means
than
10
which
V11
of
R28
length
C24
cycle.
diode
the
first diode
either
of
the
db.
vary
and
the
and
is
allows
clip-
a
The
AMPLI-
the
cath-
In
order
in
repetition
in
the
age
to
the
compensating
rate
The
voltages
V12,
and
gulate
to
unit.
is
applied
plate
or
pulse
power supply
are
VL4)
V17B
the
are
voltage
provide
rate
When
to
of
the output
for
width
regulated
or
by
used
a
more
and
pulse
the
rate
the
cathode
the
otherwise
is
increased.
circuits
either
electronic
to
regulate
supplied
constant
width,
or
pulse
of
V15
tube
and
decrease
are
conventional,
by
glow
regulators
the
to
the
pulse
a
compensation
width
through
bias
of
discharge
(VlOB,
t300V
clipper
output amplitude
circuit
is
increased,
R51
which
the
clippers
in
output amplitude
and
the
type
VL7A,
supply.
and
output
to
direct
regulator tubes
V17B).
Tubes
amplifier
with
is
incorporated
a
positive
causes
increase
when
current
Tubes
V15
andV17
circuits.
changes
volt-
the
voltage
thereby
the
supply
(V4,
VlOF
re-
50
-5000
PPS
tl
I
1
I
I
I
-
1
-
OEUY
M.V.
t
I
I
I
a
PULSE
POSITION
M
.V.
BLOCKING
OSCILLATOR.
l
t3
I
I
BLOCKlNG
WILLATOR
ts
1
I
I
I
1
t t
1r
DELlllY
LINE
?
P
I I
!
IL
-
k
THYAATRON
-
Vg
SYNC
OUT
t,
t4
:
I
I
in
t4
CLIPPER
CIRCUITS
t
r
I
L
2,
I
I
I I
I
I
ri
+
*
OUTPUT
AMFLIFIER
RTTENULITOR
tal
1
I1
I
I I
4L
u
=
f5
fl
0
PULSE
OUT
VARIABLE
PULSE
LENGTH
M.
V.
I1
I
I
I
I
I
I I1
f
l
ME
RELATIONS
II
I
I
I
WRIABLE
.O7-
I0
Y
SEC
RLOCKI
NG
OSCILLATOR
THY
RATRON
BLOCK
DLAGRAM
FIGURE
OF
3-1
MODEL
Z12A
SECTION
IV
MAINTENANCE
4-1
OUTPUT
The
output
three
Each
of
the
part
trouble
Leadin
1
7B
?7+--
Only
the
leadin
PULSE
parts:
part
output
of
the
shooting
Ed
trrggers
the
circuits
&uch
F-
ective
and
Overshoot
of
is
generator.
Very
ponent
compensates
positive
from
pulses
pensation
The
ment
observing
shape.
greater
chart.
tube, crystal
VlOTS.
the
pulse
usually caused
minor
construction,
output
thyratron
and
is
setting
is
accomplished
C11
portion
ANALYSIS
pulse
is
pulse
of
the
leading
affected
pulse,
is
chart
e
--
V6,
V6
of
ed
e
of
See
items
--
Overshoot
than
on
by
overshoot
for
this
pulses.
V6
to
the
cathode
controlled
of
each
both
positive
is
generally
of
the
the
Model 2 12A
edge,
by
different
it
will
generally
described
follows
the
rstart'
and
V6
forms
V6
and
V107B
the
output
as
jitter
diode,
2,3,
pulse.
and
or
and 4 of
occurs
the
trailing
leads
wiring
overshoot
and
capacitor
used
coming
and
This
couples
by
by
andnegative
adjustment.
tube
circuit
adjustable
affects
alternately
set
near minimum
Pulse
the
top
circuits.
indicate
separately
the
same
thyratron,
the
leading
are
A
slowness,
other
to
component
trouble
a
greater
edge.
for
external connections
from
the
lead
on
the
amplifies
it
to
for
positive
length
the
ceramic
that
adjusting
pulses.
See
Generator
or
body,
and
general
responsible
defect
If
a
the
the
"urns
edge
that
is
the
and
defect
list
order.
in
shooting
degree
Overshoot
pulse
leading
plate
generator
within
edges
a
portion
circuit
pulses.
capacitors
of
the
other,
the
Adjust
capacity.
item
5
of
will
the
trailing
appears
circuit
of
symptoms
ont
the
of
the
for
the
appears
direct
the
circuits
chart.
on
the
greater
is
the
instrument,
of
both
of
of
The
The
two
capacitors
for
C22
the
trouble
be
divided
at
fault.
output
output
condition
on
the
result
leading
than
specified
to
the
caused
negative
the
rise
V11
for
degree
C
1
1
and
final
optimum
is
used
shooting
into
edge.
on
apart
Each
in
pulse.
pulse.
of
lead-
of
a
de
of
V6
edge
pulse
by
Vl
time
negative
of
C22.
adjust-
while
pulse
for
the
-
com-
OA
and
com-
a
To of
-time plate
the
ly
will
The
500
Pulse
supply
11
micraseconds
not
fire
pulse
volts.
generated
--
When
is
constructed to
from
until
re-triggered.
by
Clippers
V7
V6
is
voltage
the
V6
is
and
triggered,
supplied
momentarily
time
very
V9
clip
it
to
V6
fires.
coarse
the
amplitude
generates
this
tube.
stop
power
V6
is
and
contains
a
pulse
To
delivery
then
peaks
to
between
limited
protect
approximate-
extinguished
in
250
in
Yb,
and
excess
and
of
350
volts
pulse
is
the
V 1 1.
plitude
pulse.
The
high
in
voltage
If
it would
ing
be a matter
ing
depending
is
now
biased
top
portion
The
that
See
body
voltage
the
pulse
supply.
the
pulse
indicate
chart.
chart.
well
formed
very
would
items
of
the
supply
body
contains
When
of
upon
beyond
of
high
final output pulse depends
adjustment
setting
for
application
cutoff.
the clipped
bias
on
otherwise
24
and
25
to
maintain
generally
See
item
peaks
ineffective
the
top
has
of
the
As
pulse
V
1
1
appear
in
trouble
indicates
b
of
trouble
or
humps
clipping,
a
gradual
and
is
AMPLITUDE
to
a
result
generated
removes
on the
high
covered
the
shooting
initial
a
defective
shooting
above
see
rise
output
of
the
high
by
unwanted
baseline
chart.
upon
items
in
sufficient
pulse
chart.
the
normal
or
drop,
item
7
control.
amplifier
bias
Vb
is
A
V11.
voltage
passed
signals
fallowing
power
amplitude.
component
level
and
8
of
trouble
the
correction
11
of
the
trouble
flat-top
through
of
low
the
from
A
droop
in
the
of
the
V11
only
am
output
high-
top,
shoot-
may
shoot-
-
the
in
Trailing
When
g
er
multivibrator
trailing
with
on
the
s
hooting
V16
pulse
'stop'
trailing
Edge
is
for
edge
chart.
t'Both'Edges
both
leading
in
a
circuit
All
circuits
and
trailing
Pulse
crease
there
and
the
rate.
If
cause
the
trouble
Length
in
rate
is
a
very
the
time
duty
cycle.
Generally,
the
start
the
output
output pulse
shooting
--
V16
triggered,
the
stop
V
1
OS
and
is the
thyratron
of
and
which
preceding
edges
--
edge
Output
trailing
affects
and
A
change
is
generally
result
of
small
the
gas
is
This
the
tube
has
this characteristic,
pulse
will
lengthen
chart.
the
'stopt
it
forms
tube
blocking
of
V16.
the output pulse.
Pulse
edges
both
V107b,
do
not
in
time
characterisitic
time
lapse
fully
lapse
to
shorten.
thyratron, 'turns off' the output
the
is
developed
oscillator
all
these
The
effects
--
If
a
trouble
of the output pulse,
start
and
(V101
affect
pulse
due
ionized.
one
length
to
one
-
between
increases
If
with
an
trailing
by
the
V
circuits,
of
these circuits
See
such
stop
through
edge
caused
of
the
the
The
degree
causes
with
an
increase
the
stop
increase
edge
of
the
circuits
l09a.
items
plus
as
The
V8
13
'jitter'
the
thyratrons
V
106b)
without
thyratrons.
time the
the
tube
in
affect
affecting the
by
an
of
time
pulse
an
increase
has
rate.
pulse.
pulse.
of
amplifier 107a,
condition
which
can
and
14
appears
defect
The
of
is
In
appear
of
trouble
is
generally
simultaneously.
both
leading
other.
increase
In
tube
length
in
pulse
this
See
is
lapse
or
some
thyratrons
triggered
depends
to
vary
in
duty
rate
characteristic,
item
17
trig-
the
series
only
-
on
de-
with
cycle.
will
of
on
High
The
pulse
symptoms
higher
pulse
rates
rates.
tax
both
of
a
failing thyratron
thyratrons
to
a
greater
therefore
degree
become
than
low
rates.
more noticeable
at
Loading...