Operating
Instructions—
Type
3B5
Time-Duration
Measurements
To
measure
time
between
two
points
on
a
waveform,
use
the
following
procedure:
1.
Connect
the signal
to
the input
connector
of
the
ampli
fier
unit.
2.
Set
the volts/division
switch
to
display
about
five
divisions of
the
waveform.
3.
Set
the
Type
3B5
Trigger
controls
to
obtain
a
stable
display.
4.
Set
the
MANUAL
TIME/DIV
switch
to the
fastest
sweep
rate
that
displays
less
than
eight
divisions
between
the
time
measurement
points
on
the
waveform
(see Fig.
2-9).
See
the
topic
entitled
Selecting
Sweep
Rate
in
this
section,
concerning
non-linearity
of
first and
last
divisions of
display.
5. Adjust
the
amplifier
unit
position
control
to
move
the
points
between
which
the
time
measurement
is
made
to
the
center
horizontal line.
6. Adjust
the
Type 3B5
POSITION
control
to move
the
starting
point
of the time
measurement area
to the
first
graticule
line.
7.
Measure
the
horizontal
distance
between
the
time
measurement
points.
Be sure
the
VARIABLE control
is
set
to
CAL.
8.
Multiply
the
distance
measured
in
step
7
by
the
sweep
rate
indicated on
the
readout
panel
to obtain
time
duration.
Example.
Assume
that
the
distance
between
the
time
meas
urement
points
is
five
divisions
(see
Fig. 2-9)
and
the indicated
sweep
rate
is .1
ms/DIV
with
the
magnifier
off.
Using
the
formula:
horizontal
indicated
Time
Duration
=
distance X
sweep
rate
(divisions)
(readout)
Substituting
the
given
values.-
Time
Duration
=
5 X
0.1
ms
The
time
duration
would
be
0.5
milliseconds.
Frequency
Measurements
The
time measurement
technique
can
also
be used
to
determine
the
frequency
of
a
signal.
The
frequency
of
a
periodically
recurrent
signal
is
the reciprocal
of
the
time
duration
(period)
of
one
cycle.
Use
the
following
procedure:
1.
Measure
the
time
duration
of
one
cycle
of
the
signal
as
described
in
the
previous
application.
2.
Frequency
of
the
signal
is
the
reciprocal
of
the
time
duration
of
one
cycle.
Example.
The
frequency
of
the
signal
shown in Fig.
2-9
which
has
a time
duration
of
0.5
milliseconds
would
be:
Frequency
=
-
-------
7----
:
—
= —
7
—
=
2
kHz
time
duration
0.5
ms
Fig.
2-9. Measuring the time duration between points on a wave
form.
Risetime
Measurements
Risetime
measurements employ
basically
the
same
tech
niques as time-duration
measurements.
The
main
difference
is
the
points
between
which
the
measurement
is made.
The
following
procedure
gives
the
basic
method
of
measuring
risetime
between
the
10%
and
90%
points
of
the
waveform.
Falltime
can
be
measured
in
the
same
manner
on
the trailing
edge
of
the
waveform.
1.
Connect
the
signal
to
the
input
connector
of
the
ampli
fier
unit.
2.
Set
the volts/division
switch
and
variable
volts/division
control
to
produce
a
display
an
exact
number of
divisions
in
amplitude.
3.
Center
the
display
about
the
center
horizontal
graticule
line.
4. Set
the
MANUAL
TIME/DIV
switch
to
the
fastest
sweep
rate
that
displays
less
than
eight
divisions
horizontally
between
the
10%
and
90%
points
on
the
waveform.
5.
Determine
the
10%
and
90%
points
on
the
rising
portion
of
the
waveform.
The
figures
given
in
Table
2-4
are
for
the
points
10%
up
from
the
start
of
the
rising
portion
and
10%,
down
from
the
top
of
the
rising
portion
(90%,
point).
6.
Adjust
the
Type
3B5
POSITION
control
to
move
the
10%,
point
of
the
waveform
to
the
first graticule line. For
example,
with
a
five-division
display
as
shown
in
Fig.
2-10,
the 10%,
point
would
be
0.5
division
up
from
the
start
of
the
rising
portion.
7. Measure
the
horizontal
distance
between
the
10%,
and
90%
points.
Be
sure
the
VARIABLE
control is set
to
CAL.
8.
Multiply
the
distance
measured in
step
7
by
the
sweep
rate
indicated
on the
readout
panel
to
obtain
risetime.
2-15
Summary of Contents for 3B5
Page 4: ...Fig 1 1 Type 3B5 Automatic Programmable Time Base unit Type 3B5...
Page 15: ...Operating Instructions Type 3B5 TYPE 3B5 CONTROL SET UP CHART Fig 2 2 Control set up chart 2 7...
Page 48: ...CO I o Fig 3 13 Delay and Timing Circuit logic block diagram Circuit Description Type 3B5...
Page 61: ...GO i GO GO Fig 3 22 Seek Ciicuit Logic block diagram Circuit Description Type 3B5...
Page 70: ...u k KJ Fig 3 29 Circuit conditions for Manual Mode operation Circuit Description Type 3B5...
Page 71: ...w K w Fig 3 30 Circuit conditions for Seek Mode operation Circuit Description Type 3B5...
Page 72: ...w I u U Fig 3 31 Circuit condition for External Mode operation Circuit Description Type 3B5...
Page 88: ...Maintenance Type 3B5 Fig 4 9 Location of components on Logic Card 4 14...
Page 89: ...u Oi Fig 4 10 Location of components on Counter Card Maintenance Type 3B5...
Page 92: ...NOTES I...
Page 104: ...NOTES...
Page 106: ...Calibration Type 3B5 Fig 6 1 Recommended calibration equipment...
Page 160: ......
Page 176: ...J400 RtADOUT BOARD 3B5 PLUG IN A READOUT...
Page 182: ...397 R E A D O U T B O A R D 10 6b READOUT BOARD...
Page 184: ...FIG 1 FRONT SWITCHES TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Page 185: ...FIG 2 CHASSIS REAR 3 GS to TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Page 186: ...OPTIONAL ACCESSORIES...
