Circuit
Description
—
Type
3B5
Fig. 3-9.
Trigger level current for auto triggering (Manual Mode, Seek Mode or External Mode operation).
External
Mode.
For
External
Mode
operation,
—12.2
volts
External
Power
is
applied to
the
base
of
Q634
through
D635.
This
holds
the
Trigger
Latch
Circuit
off
and
the
manual
trigger
LEVEL
control
and
the
Trigger
Function
switch
are
disconnected.
Now,
the
operation
of
the
Trigger
Mode
Logic
stage
is controlled
by
the
external
program
function
logic
connected
to
J30.
Trigger
Mode
Logic
General.
The
Trigger
Mode
Logic
stage
selects
the
trigger
mode,
coupling
and source.
For
Manual
and Seek
Mode
operation,
the
Trigger
Function
switch
controls
operation
(note
exception
given
above
for Seek
Mode). For External
Mode
operation,
these functions
are controlled by
external
program
function
logic
through
J30.
In
all
modes
of
opera
tion,
trigger
source,
coupling,
mode
and
level
are determined
by
the
condition
of
relays
K3
and
K4
and
diodes
D
10,
D39
and
D42.
Therefore,
the
following
description
is
written
to
relate
circuit
operation
in
each
mode
to
these
components.
Manual
Mode.
The
Trigger
Function
switch,
SW50,
controls Sweep Trigger circuit
operation
for
the
Manual
Mode
of
operation.
In
the
INT-AUTO
position,
D52
is
disconnected
from
the
Trigger
Mode
Logic
stage.
SW50
also
connects
the
base
of
Q54
to
ground
to
shut
off
the
Trigger
Latch
Circuit
and
the
collector
of
Q54
goes
negative.
This
forward
biases
D9
and
drops
the
voltage
level
at
the
anode
of
D
10
to
a
level
that
reverse
biases
it.
Fig.
3-9
shows
the
condition
of
the
logic
diodes
for auto triggering.
The
level-control
current
from
the
front-panel
LEVEL
control
is
shunted
away
from
the
Trigger
Level
Amplifier.
No
connec
tions are
made
to
K3
or
K4 so
no
control
current
flows
through
either
relay
and
the
corresponding
switches
are
not
actuated.
This
means
that
the
applied
trigger
signal
is
AC
coupled
from
the
internal
source.
With
no
current
through
K3
or
K4,
the
cathode
of
D46
drops
to
about
—12
volts.
D43
is
forward
biased
and
D42
reverse
biased
to
divert
the
external
program
level
current
away from the Trigger
Level
Amplifier.
In addition,
Seek/Manual
Power (see
Operating
Mode
Power
discussion)
is
connected
to
the
cathode
of
D41
to
forward
bias
it and
insure
that
D42
remains
reverse
biased.
The
—
12-volt
level
at
the
cathode of
D46
allows
the
base
of
Q44
to
go
toward
—
12.2
volts
and
it
is
reverse
biased.
The
collector
of
Q44
rises
toward
the
+
125-volt
supply
and
when
this
voltage
reaches the
firing
potential
of
B47,
Auto
Trigger indicator,
it
comes
on
to
indicate
that
the
trigger
circuits
are operating
in
the
auto
trigger
mode.
The
positive-going
potential
at
the
collector
of
Q44
reverse
biases
D37 and
allows
D39
to
conduct.
This
connects
the
auto
trigger
level control
current from
the
Auto
Trigger
P-P
Level
stage
to
the
emitter
of
the
Trigger Level
Amplifier.
The
collector
level
of
Q44
is
also
connected
to
the
Bright
Baseline
stage
through
D296.
Complete
operation
is
only
described
for
the
INT-AC
position
of
normal
triggering
since
operation
in
the
INT-AC,
EXT-AC
and
EXT-DC
positions
of
the
Trigger
Function
switch
are
basically
the
same
except
for
control
of
the
current
through
K3
and
K4.
Only
the
differences
are
given
for
EXT-AC
and
EXT-DC.
When
SW50
is
in
the
INT-AC
position,
3-13
Содержание 3B5
Страница 4: ...Fig 1 1 Type 3B5 Automatic Programmable Time Base unit Type 3B5...
Страница 15: ...Operating Instructions Type 3B5 TYPE 3B5 CONTROL SET UP CHART Fig 2 2 Control set up chart 2 7...
Страница 48: ...CO I o Fig 3 13 Delay and Timing Circuit logic block diagram Circuit Description Type 3B5...
Страница 61: ...GO i GO GO Fig 3 22 Seek Ciicuit Logic block diagram Circuit Description Type 3B5...
Страница 70: ...u k KJ Fig 3 29 Circuit conditions for Manual Mode operation Circuit Description Type 3B5...
Страница 71: ...w K w Fig 3 30 Circuit conditions for Seek Mode operation Circuit Description Type 3B5...
Страница 72: ...w I u U Fig 3 31 Circuit condition for External Mode operation Circuit Description Type 3B5...
Страница 88: ...Maintenance Type 3B5 Fig 4 9 Location of components on Logic Card 4 14...
Страница 89: ...u Oi Fig 4 10 Location of components on Counter Card Maintenance Type 3B5...
Страница 92: ...NOTES I...
Страница 104: ...NOTES...
Страница 106: ...Calibration Type 3B5 Fig 6 1 Recommended calibration equipment...
Страница 160: ......
Страница 176: ...J400 RtADOUT BOARD 3B5 PLUG IN A READOUT...
Страница 182: ...397 R E A D O U T B O A R D 10 6b READOUT BOARD...
Страница 184: ...FIG 1 FRONT SWITCHES TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 185: ...FIG 2 CHASSIS REAR 3 GS to TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 186: ...OPTIONAL ACCESSORIES...
