Operating
Instructions—Type
3B5
CONTROL
SETUP
CHART
Fig.
2-2
shows
the
front
panel
of
the
Type
3B5
along
with
an
enlarged
view
of
the
PROGRAM
connector.
This
chart
can
be
reproduced
and
used
as
a
test-setup
record
for
special
measurements, applications or
procedures,
or
it
may
be
used
as
a
training
aid
for familiarization
with
this
instrument.
GENERAL
OPERATING
INFORMATION
Horizontal
Gain
Adjustment
Whenever
the
Type
3B5
is
inserted
into
a
plug-in com
partment
other
than
the
one
in
which
it
was
calibrated,
the
CAL
adjustment
should
be
checked and
readjusted
if
neces
sary.
Allow about
five
minutes
warm
up
before
making
this
adjustment
(procedure
given
for
50-
or
60-hertz
line-frequency
calibrator; use
the
Calibration procedure
for other
calibrator
frequencies).
1.
Connect
a
one-volt
square
wave
from
the
indicator
oscilloscope
calibrator
to
the
amplifier
unit
input
connector.
2.
Set
the
MANUAL
TIME/DIV
switch
to
5
ms
(2
ms
for
50
Hz),
the
Trigger
Function
switch
to
INT-AUTO and
the
LEVEL
control
to
midrange.
3.
Press
the
amplifier
unit
seek
button.
4.
Press
the
Type 3B5
MAN
button.
5. CHECK
—CRT
display
for three
complete
cycles over
the
10-division
display
area
(one
complete
cycle
for
50-Hz
calibrator).
6. ADJUST—
CAL
adjustment
for
three
complete
cycles
over
the
10-division
display
area
(one
complete
cycle
for
50-Hz
calibrator).
NOTE
Althrough
the
preceding
method
provides
a
fairly
accurate adjustment
for
most
measurements,
better
accuracy
can
be
obtained
using the
procedure
given in
the
Calibration
section
of
this
manual.
Adjusting
Number of Cycles
in
Seek
Mode
Display
The
CYCLES/SWEEP
adjustment
on
the
front
panel
permits
the
operator
to
adjust
the
Type
3B5
for
the
nominal
range
of
cycles
displayed
when
in
the
Seek
Mode
of
operation.
Use
the
following
procedure
to adjust
the
CYCLES/SWEEP
adjust
ment
(for
more
information
on
operation
in
the
Seek Mode,
see
Seek
Mode
Operation
in
this
section).
1.
Connect
a
signal
(calibrator
output
or
one-millisecond
markers
recommended) which
is
within
the
frequency
and
amplitude
capabilities
of
the
Seek
Mode
to
the
amplifier
unit input connector.
2. Press
the
amplifier unit
seek
button.
3.
Press
the
Type
3B5
SEEK
button.
4.
CHECK—
CRT
display
for
desired
number
of
cycles.
5.
ADJUST
—Hold
the
Type
3B5
SEEK
button
depressed
and
adjust
the
CYCLES/SWEEP
adjustment
for
the
desired
display.
Allow
time
for
the
seek
circuits
to
recycle
between
adjustments (one
to
two
seconds).
NOTE
This adjustment
selects
a
nominal
range
of
opera
tion
and
the
exact
number
of
cycles
displayed
for
a
particular
signal
will
vary
due
to
the
sweep
rate
selected by
the
Seek
Circuit.
The
sweep
rate always
increases
in
a
5-2-1
sequence.
Trigger
Level
Centering
Adjustment
The
TRIG
LEVEL
CENTERING
adjustment
should
not
be
readjusted
during
normal
use.
A
complete adjustment
pro
cedure
is
given
in
the
Calibration
section
of
this
manual.
Trigger
Source
Internal.
For most
applications,
the
sweep
can
be
trig
gered
internally.
In
the
INT
positions
of
the
Trigger
Function
switch
(or
when
selected
by
external program),
the
trigger
signal is
obtained
from
the
amplifier
unit.
Two
methods
of
internal
triggering
are
provided;
AUTO and
AC.
These
methods
are
described
fully
under
Trigger
Coupling
and
Auto
Triggering.
External.
An
external
signal
connected
to
the
EXT
TRIG
INPUT
connector can
be
used
to
trigger
the
sweep in
the
EXT
positions of
the
Trigger Function
switch
(or
when
selected
by
external
program).
The external
signal
must
be
time-
related
to
the
displayed
signal
to produce a
stable
display.
Use
an external
trigger
signal
to
provide
a
triggered display
when
the
internal
signal
is
too
low
in amplitude for
correct
triggering
or
contains signal
components
on
which
it
is
not
desired
to
trigger.
It
is
also
useful
when
signal tracing
in
amplifiers,
phase-shift
networks,
wave-shaping
circuits,
etc.
The
signal
from
a
single
point
in
the
circuit
under
test
can
be
connected
to
the
EXT TRIG INPUT
connector
through
a
signal probe
or cable.
Then,
the
sweep
is
triggered
by
the
same
signal
at
all times
and
allows
amplitude,
time relation
ship
or
wave
shape
changes
of
signals
at various
points
in
the
circuit
to
be
examined
without
resetting
the
trigger
controls.
The
external
trigger
signal
can
be
either
AC
or
DC
coupled
(see
Trigger
Coupling
for
further
information).
Since
DC
trigger coupling
is
provided
only
in
the
EXT
source
position,
the
sweep
must
be triggered
from
an
external
signal
to
take
advantage
of
this
feature.
Trigger
Coupling
AC.
AC
trigger
coupling
is
provided in
both
the
INT
and
EXT positions
of
the
Trigger
Function
switch.
The
DC
com
ponent
of
the
trigger
signal is blocked
and
all
AC
signals
below
about
50
Hz
are
attenuated.
In general, AC
coupling
can
be
used
for
most
applications.
However,
if
the
sweep
is
to
be
triggered
at
a
certain
DC
level,
DC
coupling
(EXT
position)
must
be
used.
The
triggering
point
in
the
AC
position
depends
upon
the
average voltage
level
of
the
trigger
signal.
If
trigger
signals
occur randomly,
the
average
voltage
level will
vary,
which
causes
the
triggering
point
to
vary
also.
This
shift
of
the
2-6
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...