Circuit
Description
—
Type
3B5
Reverse-biased diode
Fig.
3-11. Trigger level current
fcr External
Mode triggering
(non-auto).
level
current
and
D52
is reverse
biased
to
disconnect
the
Trigger
Function switch.
Now,
trigger
source,
coupling
and
mode
are selected
by
connecting grounding (zero-volt
external
program
function
logic to
either
terminal
28,
30
or
31
of
the
PROGRAM
connector.
If
no connections
are
made
to
these
three
terminals,
the
circuit
operates
in
the
auto
trigger
mode.
Since
there
are
no
connections
to
the
base
of Q44,
it
goes
negative and turns off.
The
Auto
Trigger
light
comes
on
and
D37 is
reverse
biased
to
allow
auto
trigger
level current
(controlled
by
the
front-panel
LEVEL
control)
to
be
connected
to
the
Trigger
Level
Amplifier.
Also,
D43
is
forward
biased
by
the
negative
potential
in
the base
circuit
of
Q44
and
it
shunts
the
external
program
level
control
current
away
from
Q14.
The
Seek/Manual
Power
at
the cathode
of
D41
is
disconnected
in
the
External
Mode
of
operation
so
this
diode
is,
in
effect,
reverse biased.
For
Int
AC
operation, grounding
external
program
function
logic
is connected
to
terminal
31
of
J30.
This places
a
zero
volt
potential
at
the
cathodes
of
D46
and
D43.
D46
remains
reverse
biased
and
no
current
flows
through
either
K3 or
K4.
K3-1
and
K4-1
remain
in
their
unactuated
positions
for
AC
coupling
from
the
internal trigger
signal.
However,
D43
is
reverse
biased
and
the external
program
level
control
current
is
coupled
to
the
Trigger Level
Amplifier
through
D42.
Fig. 3-11
shows
the
condition
of
the
logic
diodes
for
external
level
control.
Zero-volt
logic
to
terminal
31
also
raises
the
potential at
the
base
of
Q44
and
it
conducts.
The
Auto
Trigger
light
goes
out
and
D37
is
forward
biased
to
shunt
the
auto
trigger
level
current
away from the Trigger
Level
Amplifier.
For
Ext
AC
operation,
grounding
external
program
function
logic
is
connected to terminal
30
of
J30.
This
places
a
zero
volt
potential
at
the
anode
of
D46.
D45 remains
reverse
biased
and current
does
not
flow
through
K4.
However,
current does
flow
through
K3
and
K3-1
is
switched
from
the
internal source
to
the
external
source.
D46
is
forward
biased
and
the
base
of
Q44
rises
positive
enough
for
it
to
conduct.
Also,
D43
is
reverse
biased by
this
positive
level.
The
remainder
of
the circuit
operates
as
described
for
Int
AC.
For
Ext
DC
operation,
grounding
external
program
function
logic
is
connected
to
terminal
28
of
J30.
This
places
a
zero
volt
level
at
the
anode
of
D45.
Current
flows
through
K4
and
K4-1
closes
to direct
couple
the
signal
to
the
Input
Emitter
Follower.
Also,
D45
is
forward
biased
and
allows
current
to
flow
through
K3
to
select
the
external
trigger
source.
D43
is
reverse
biased
and
Q44
is turned
on
through
D46
as for
Ext
AC
operation.
The
remainder
of
the
circuit
operates
as
described
for Int
AC.
Sweep
Generator
General
The
Sweep
Generator
circuit
produces a
sawtooth
voltage
to
provide
horizontal
deflection.
This
output
signal is
gen
erated
on
command
(trigger
pulse) from
the
Sweep
Trigger
circuit.
The
Sweep
Generator
circuit also
produces
an
unblanking
pulse
to
unblank
the
CRT
to
display
a
signal.
In
addition, the Sweep
Generator
circuit
can
produce
a
3-15
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...
