Circuit
Description
—
Type
3B5
Fig.
3-18.
Readoul
logic block diagram.
indications
for Manual
Mode
operation.
The
wiper contacts
of
these
switches
are connected
to
Manual
Power
through
diodes.
In
the
Manual
Mode
of
operation,
—
12.2
volts
Manual Power
is
applied
and
the
diodes
are
forward
biased.
For
Seek or
External
Mode
operation,
Manual
Power
is
disconnected
from
the
diodes
and
the
setting of
these
switches
does
not
affect
operation
of
this
circuit.
Wafer
3F
of
SW450
determines
the
Manual
Mode
multiplier
logic
to
the
1,
2, 5
readout
bulbs.
This
logic
is —
12
volts
for
the
desired
multi
plier.
The
Manual
Mode
multiplier
logic
sequence is
5-2-1
throughout
the
rotation
of
the
switch.
This
wafer
also
pro
vides
the
Manual
Mode
multiplier
logic
to
the
Sweep
Gen
erator
and
the
Delay and
Timing
Circuit.
Wafer
3R
of
SW450
provides
the
Manual
Mode
decade
logic
to
the
Sweep
Generator
and
the
Delay
and
Timing
Circuit. A
—12
volt level is connected
to
one
of
the
1
s-
0.1
/xs
(a-h)
decade
logic
lines
to
select
the
timing
decade.
In
the
last
three
clockwise
positions
(10,
20
and
50
ns),
D404
applies
—
12
volts
to
the
0.1
/xs (h)
logic
line
to
hold
this
decade
on.
The
10
ns
(i)
logic
level
established
in
these
positions
turns
on
the
"0", “
m
”, "
μ
"
readout
through
diodes
D485,
D486
and
D487.
The
10
ns
logic
is
also
connected
to
the
Horizontal
Amplifier
circuit.
Wafers
1R,
2F
and
2R
provide
the
decade readout for
the
Manual
Mode.
Only
one
of
these
wafers
is returned to
—
12.2
volts
Manual
Power through
the
DLY'D
SWP
MAG
switch, SW940.
These
two
switches
in
combination
provide
Manual
Mode
magnifier
decoding.
For
example,
when
the
MANUAL
TIME/DIV
switch
is
in
the 5
s
position
and
the
DLY'D
SWP
MAG
switch is
set
to
X
1,
there is
no
output
from
the
decade
readout.
The
5
and
s/DIV
readouts
are
on
as
controlled
by
other
circuits
previously
discussed.
For
X10
delayed
sweep magnification,
the
DLY
’
D
SWP
MAG
switch applies
—12
volts
to
wafer
2F.
This
logic
level
turns
on
the
readout
to
indicate
a
magnified
sweep
rate
of
0.5
seconds/division.
In
the X
1
00
position
of
SW940,
Manual
Power
is
applied
to
wafer
2R.
The
"0" and
“
m"
readouts
are
turned
on
through
diodes
D491
and
D492
to
indicate
a
magnified
sweep
rate
of
50
milliseconds/division.
Wafer
IF
provides
manual-return
logic
to
the
Operating
Mode
Power
circuit.
As
the MANUAL TIME/DIV
switch
position
is
changed,
this
wafer
opens
the
ground
return
to
the
Seek
Mode
Control
stage
and the
unit
returns
to
Manual
Mode
operation
(see
Operating
Mode
Power
for
more
information).
External/Seek
Decade
Readout Decoding
Decade
logic from
the
Counter
Circuit
and X
1,
X10
and
X
1
00
magnifier
logic
from
the
Delayed
Sweep
Magnifier
Control
circuit
are
applied to the
External/Seek
Decade
Readout
Decoding
stage
to
determine
the decade
readout
in
the
Seek
and
External
Modes
of
operation.
The
decade
logic
level
applied
is
—
12
volts
for
the
decade
logic line
that
is
on
and
zero
volts
for
the
remaining
lines.
Magnifier
Logic
Level
is
—12
volts
3
for
the
delayed
sweep
magnifica-
°The magnifier logic level may be as low as —5.5 volts or, on the
X
100
logic
line (X100 magnifier logic)
it may drop to zero under
certain
conditions; see Delayed Sweep
Magnifier Control circuit
discussion
for explanation. However, these differing
levels do not
affect operation.
3-28
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...
