SECTION
1
CHARACTERISTICS
The
Tektronix
Type
3B5
Automatic/Programmable
Time
Base
unit
provides
automatic
and
programmable
time-base
features,
in
addition
to
conventional
time-base
features,
for
Tektronix
oscilloscopes
which
accept
3-series
time-base
units1
The
Type
3B5
provides
automatic
sweep
rate
and
trigger
seeking
on
Seek
command
either
from
the
front-panel
SEEK
button,
from
a
remote-seeking
probe
(through
an
associated
automatic/programmable amplifier
unit)
or
from
an
external
source
(through
either
the
front-panel
PROGRAM
connector
or
the
program
connector
of
the
associated
automatic/pro
grammable
amplifier
unit).
All
front-panel control functions
(except
variable
sweep rate) can be externally
programmed
through
the
front-panel
PROGRAM connector. The
MANUAL
TIME/DIV
switch provides selection of
sweep
rates
from
5
seconds/division to
10
nanoseconds/division with
delayed
1Except the Type 561 (SN 5000 and below). When used in a Type
565,
a
vertical sweep is provided.
sweep
magnification
of
10
and
100
times
(up
to a maximum
magnified
sweep
rate of
0.1
microseconds/division).
A
front-panel
illuminated
readout
panel
indicates
sweep
rate, magnified
sweep
(with
correct
indication
of
magnified
sweep
rate),
non-triggered
sweep
and
uncalibrated
sweep.
The
readout
panel
functions in
all
modes
of operation.
The
characteristics
which
follow
are
divided
into
two
cate
gories.
Characteristics
listed
in
the
Performance
Requirement
column
are
checked
in
the
Performance
Check
and
Calibra
tion
sections of
this
manual.
Items
listed
in
the
Supplemental
Information
column
are
provided
for
reference
use and
do
not
directly
reflect
the
measurement capabilities
of
this
instrument.
The
Performance Check
procedure
given in
Section 5
of
this
manual
provides
a
convenient
method
of
checking
the
Performance
Requirements listed in
this
section.
The
following
characteristics
apply
over
an
ambient
tempera
ture
range
of
0°
C
to
+50°
C,
except
as
otherwise
indicated.
Warm-up
time
for
given
accuracy
is
five minutes.
ELECTRICAL
CHARACTERISTICS
TRIGGERING
Characteristic
Performance
Requirement
Supplemental
Information
Source
Internal
or
external
Coupling
AC
internal
AC
or DC
external
Polarity
Sweep
can
be
triggered
from
positive-going
or
negative-going
portion
of
trigger
signal.
Slope
changed
automatically
each
time
CHANGE SLOPE button
is
pressed.
Mode
Auto
triggering
Normal
triggering adjustable for
desired
level
Internal
Trigger
Sensitivity
AUTO
and
AC
0.5
division
of
deflection,
minimum,
50
Hz
to
20
MHz
Checked
with Type
3A5 signal
dis
played,
10
millivolts/division or greater
sine
wave. Typically —3
dB
down
at
10Hz
External
Trigger
Sensitivity
AC
1.0
volt, peak
to
peak,
50
Hz
to
20 MHz
Typically
—
3
dB
down at 10
Hz
DC
1.0
volt,
peak
to
peak,
10
Hz
to
20
MHz
2.5
volts,
peak
to
peak, DC
to
10
Hz
Trigger LEVEL Control
Range
INT-AC
At least
+
and
—
10
volts
EXT-AC
At least
+
and
—
20
volts
EXT-DC
At least
+
and
—
10
volts
AUTO
Approximately
10%
and
90%
of
trigger
signal
transition
with
a
minimum
of
0.5
division,
(10
millivolts/division
or
greater)
1
kHz
sine
wave
displayed
with
Type
3A5
External
Program
Trigger
Level
Range
Same
as
front-panel
range
with
current
change
between
about
0
and
400
micro
amps
External Trigger
Input
RC
Characteristics
Approximately
150
kilohms
paralleled
by
about
22
pF
Maximum
Input
Voltage
at
EXT
TRIG INPUT
connector
100
volts,
DC
+
peak
AC
1-1
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...
