Operating
Instructions
—
Type
3B5
i i
i i
i
i
Jitter
Fig.
2-14. Measuring pulse
jitter.
Multi-Trace
Phase
Difference
Measurements
Phase
comparison
between
two
signals of
the
same
fre
quency
can
be
made
using
a
dual-trace
amplifier
unit
with
the
Type
3B5.
This
method
of
phase
difference measurement
can
be
used
up
to
the
frequency
limit
of
the
amplifier
unit.
To
make
the
comparison, use
the following
procedure:
1.
Set
the
amplifier
unit
input
coupling
switches
to
the
same
position,
depending
on
the
type
of
coupling desired.
2.
Set
the
amplifier
unit
mode
switch
to
either
chopped
or
alternate.
In
general,
chopped
is
more
suitable
for
low-
frequency
signals
and
alternate
is more
suitable
for
high-
frequency
signals.
More
information
on
determining
the
mode is
given
in
the
amplifier
unit instruction
manual.
3. Connect the
reference
signal
to
channel
1
and
the
comparison
signal
to
channel
2.
The
reference
signal
should
precede
the
comparison
signal
in
time. Use
coaxial
cables
or
probes
which
have
equal
time
delay
to
connect
the
signal
to
the
input
connectors.
4.
If
the
signals
are
of
opposite
polarity,
invert
the
signal
on
one
channel.
(Signals may
be
of
opposite
polarity
due
to
180°
phase
difference;
if
so,
take
into
account
in
final
calculation.)
5.
Set
the
volts/division
switches
and
the
variable
volts/
division
controls
so
the displays
are
equal,
and
about
five
divisions,
in
amplitude.
6.
Set
the
Type
3B5
Trigger
controls
to
obtain
a
stable
display
(trigger
on
channel
1 only
or
external
trigger
on
reference
signal).
Channel 1
Channel
2
Fig. 2-15.
Measuring phase difference.
7. Set
the
MANUAL
TIME/DIV
switch
to
a
sweep
rate
which
displays about
one
cycle
of
the
waveform.
8.
Move
the
waveforms
to the center
of
the
graticule
with
the
amplifier
unit
position
controls.
9.
Turn
the Type
3B5
VARIABLE
control
until
one
cycle
of
the
reference
signal
(channel
1)
occupies exactly
eight
divisions between
the
first and
ninth
graticule vertical
lines
(see Fig. 2-15).
Each
division
of
the
graticule represents 45°
of
the
cycle (360°
/
8
divisions
=
45°
/division).
The
sweep
rate
can
be
stated
in
terms
of
degrees
as
45°
/division.
10.
Measure
the
horizontal
difference
between
corres
ponding
points
on
the
waveforms.
11.
Multiply
the
measured
distance
(in
divisions)
by
45°
(sweep
rate)
to
obtain
the exact
amount
of
phase difference.
Example.
Assume
a
horizontal
difference
of
0.6
divisions
with
a sweep
rate
of 45°
/div
as
shown
in
Fig. 2-15
Using
the
formula:
horizontal
Phase
Difference
=
difference X
(divisions)
sweep
rate
(degrees/div)
Substituting
the
given
values:
Phase
Difference
=
0.6
X
45°
The
phase difference
would
be
27°.
2-19
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...
