Tektronix 3S3 User manual

INSTRUCTION
MAN
UAL
Serial
Number
Tektronix, Inc.
S.W.
Millikan
Way
@
P.
O.
Box
500
@
Beaverton,
Oregon
97005
@
Phone
644-0161
@
Cables:
Tektronix
070-0759-00
468

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TYPE 3S2 SAMPLING UNIT
A
POSITION
B
POSITION
DC
OFFSET
+1¥V
DUAL-TRACE
DC
OFFSET
+1V
DOT
RESPONSE
mVOLTS/DIV
mVOLTS/DiV-
TYPE
S-1
i
TYPE
S25)
SAMPLING
HEAD
oF
~
SAMPLING
HEAD
RISETIME
<350ps
Fig. 1-1. Type 352 Sampling Unit.

Type 382
SECTION I
SPECIFICATION
Change information, if any, affecting this section will be found at the
rear of the manual.
General Information
The Type 382 Sampling Unit is a dual-channel vertical
amplifier plug-in unit designed for operation in any one
of the Tektronix Type 560-Series Oscilloscopes except the
Type 561 (it will operate in the Type 561A). The Type 382
accepts ‘'S' Series sampling heads. The sampling heads
determine the input characteristics of the sampling unit
and the availability of the trigger pickoff.
The Type 382 will operate with any Tektronix 3T-series
sampling unit. The Type 3T2 Random Sampling Sweep is
recommended, because it can display the triggering event
without a pretrigger or signal delay line. Conventional or
real time 2B- or 3B-series time-base units include the Types
2B67, 3B1, 3B4 and the 3B5 non-digital time bases, and the
Type 3B2 Analog/Digital Time Base Unit. The Type 382
provides the vertical information needed for voltage meas-
urements by Tektronix digital readout systems, such as the
Type 567-Type 6R1A, or the Type 568-Type 230.
One or two “S” Series sampling heads can be plugged
into the Type 3S2, or used remotely on an optional exten-
der cable unit. The Type 3S2 provides the power for the
sampling heads.
Interconnections to the circuits in the sampling heads are
provided by connectors in the sampling head compartments
of the Type 382.
If a trigger pickoff is provided in the sampling head, the
Type 352 provides a trigger selection circuit and returns a
portion of the input signal to the front panel for externally
triggering a sampling sweep unit. An internal reconstructed
signal is provided to trigger the real-time time-base.
Sampled signals are presented to both the oscilloscope
CRT and to the front panel connectors for external use with
auxiliary equipment such as pen recorders. The two Chan-
nels may be displayed either individually or in one of three
combined modes: DUAL-TRACE, A+B (Algebraic addition},
or a VERT/B HORIZ (X-Y). The A VERT/B HORIZ (X-Y)
mode does not apply in real time operation.
ELECTRICAL CHARACTERISTICS
Digital Unit Compatibility
The Type 3S2 is compatible for operation with all Type
230 Digital Units and all Type 6RIA Digital Units. It is
compatible with ail Type 6R1 Digital Units SN 695 and up.
The Type 6R1 Digital Units SN 101-694 require the installa-
tion of Tektronix Modification Kit 040-0342-00 when oper-
ating with a Type 3872.
The following characteristics apply over an ambient tem-
perature range of 0°C to + 50°C. These characteristics
apply only after the Type 3S2 VERT GAIN control has been
properly adjusted for the oscilloscope and after a sufficient
warm-up time. For particular system warm-up requirements,
refer to the main frame oscilloscope instruction manual. A
procedure for mating the Type 3S2 to each oscilloscope can
be found in the Operating Instructions section.
The Type 382 meets the tolerances stated below after a
5-minute warmup.
ELECTRICAL CHARACTERISTICS
Characteristic
Performance Requirement
Supplemental Information
Deflection Factors
Units/Div Switch Range
2 to 200 in 7 steps in a 1-2-5 sequence with
Units/Div labeled on the sampling head.
Accuracy
Within 3%, NORMAL; 6% SMOOTH
Normal sequential sampling with at
least 20 samples per cycle of displayed
square wave.
Units/Div VARIABLE Range
Reduction in deflection to 0.7 or less when
control is turned CCW from CAL position, and
2.5 times or more increase in deflection when
control is turned CW from CAL position.
Interchannel Delay Range
At least +5ns ‘to —5ns.
With two same type sampling heads
plugged in, using time-coincident sig-
nals.
Loop Gain
NORMAL
control.
Can
be
set
to
unity
with
DOT
RESPONSE
|
Range
of
DOT
RESPONSE
control
is
<0.95 to >1.05.
@1
1-1

Specification—Type 352
ELECTRICAL CHARACTERISTICS (cont'd)
Characteristic
Performance
Requirement
Supplemental
Information
SMOOTH
Loop
gain
is
reduced
to
be
<0.3.
Random
noise
in
display
reduced
to
approx
\.
Dot
Slash
Vertical
dot
drift
is
<
0.1
div
when
sampling
|
Measure
with
Units/Div
switch
at
200
sweep
unit
is
triggered
at
20
Hz.
with
no
signal
input
to
the
sampling
head.
OFFSET
Output
Voltage
Range
+10
to
—10
volts.
Accuracy
Actual
DC
OFFSET
Voltage
is
0.1
X
Source
Resistance
10kQ
within
1%.
OFFSET
Output
voltage
within
2%.
DC
OFFSET
Range
+1
to
—1
volt'.
A
Output,
B
Output
Amplitude
in
Volts
Signal
input
times
Maximum
output
voltage
+4
V.
Source
(Referred
to
Input}
200
Resistance
10kQ,
within
0.5%.
Units/Div
Setting
Accuracy
(Referred
to
Input)
Within
2%.
Accuracy
(Referred
to
CRT)
Within
3%.
(200
mV/Div).
Accuracy
of
Vertical
Signal
to
Within
3%.
Digital
Unit
TRIG
OUT
(SN
B040250-up)
(with
|
Approximately
1
inut
signal
voltage
into
Type
S-1,
5-2}
500
for
AC.
Approximately
.1X
input
sig-
Amplitude
(referred
to
the
Type
|nal
voltage
into
509
for
DC.
Coupling
time
S-1,
S-2
input)
constant
is
5s.
Approximately
1
for
both
AC
and
DC
signals
into
1
MQ.
Risetime
2ns
or
less,
10%
to
90%,
into
50
9
using
70
ps
risetime input pulse
Strobe
signal
in
Trig
Out
Signal
|
<50mV
peak
into
500
TRIG
OUT,
SN
B010101
to
SN
Approximately
0.1
X
input
signal
volt-
B030249
{with
Type
S-1, $-2)
age
DC
coupled
into
509.
Amplitude
(Referred
to
the
Type
Approximately
21/)>
input
signal
volt-
$-1,
$-2
input)
age
into
1
MQ.
Risetime
0.6ns
or
less,
10%
to
50%,
into
500
using
70 ps risetime input pulse.
Strobe
signal
in
Trig
Out
signal
|
<<10
mV
peak
into
50
Q.
Position
Indicator
Lamps
One
indicator
lamp
will
be
on
and
the
other
off
when
CRT
dot
is
more
than
4
divisions
away
from
the
graticule
centerline.
POSITION
Range
>
+5
to
—5
vertical
divisions
from
the
grati-
|
When
DC
OFFSET
is
set
to
deliver
OV
cule
center.
to
OFFSET
output
jack.
1Unless
otherwise
stated
on
the
sampling
head
front
panel.
ENVIRONMENTAL CHARACTERISTICS
Storage
Operating
Temperature—
—40°C
to
465°C.
Operating
Temperature—
0°C
to
+50°C.
Altitude—
To
50,000
feet.
Operating
Altitude—
To
15,000
feet.
MECHANICAL CHARACTERISTICS
Dimensions—
Height
61%
inches
Construction—
Aluminum
alloy
chassis
with
epoxy
laminated
circuit
boards.
Front
panel
is
anodized
alu-
Width
41,
inches
minum.
Length
14¥,
inches
Accessories—
An
illustrated
list
of
the
accessories
supplied
with
the
Type
352
is
at
the
end
of
the
Me-
Approximate
dimensions
including
knobs
and
connectors.
chanical
Parts
List
pullout
pages.

Type 382
SECTION 2
OPERATING INSTRUCTIONS
Change information, if any, affecting this section will be found at the
rear of the manual.
General Information
This section discusses installation, first time operation,
function of front panel controls and connectors, basic opera-
tion and applications of the Type 382. If you are unfamiliar
with sampling, it may be very helpful to read Section 3,
Basic Tektronix Sampling Principles, before proceeding with
this section.
The Type 352 is a special purpose dual-channel sampling
unit designed to operate with the following indicator oscillo-
scopes: Type 561A, RM561A, Type 567, RM567, Type 568, and
R568. The Type 3S2 accepts S-series sampling heads which
determine the input characteristics of the sampling system
and provide a trigger pickoff. For equivalent time sampling,
the sampling system consists of an indicator oscilloscope,
Type 382 with sampling head (or heads), and a sampling
sweep unit. A random sampling sweep unit such as the Type
312 is recommended, because it eliminates the necessity of
pretriggering or signal delay for viewing a repetitive signal.
The Type 3S2 can be used for real time operation with
all real-time time-base units such as Type 2B67, 3B1, 3B2,
3B3, 3B4, and 3B5. An internal trigger source from the
display signal is provided for real time operation.
The vertical deflection factors of 2 to 200 are calibrated
to the units labeled on the sampling head. Sampling head
extender cable units are available to operate the S-series
sampling heads remotely up to 6 feet away. Three-foot
sampling head extender cable is Tektronix Part No. 012-
0124-00. Six-foot sampling head extender cable is Tek-
tronix Part No. 012-0125-00. Contact your local Tektronix
Field Engineer or Representative for price and availability
of these optional accessories.
Installing the Type 3S2 in the Oscilloscope
The Type 382 is designed to drive the vertical deflection
plates of the oscilloscope CRT, and therefore is installed in
the left-hand compartment of the oscilloscope.
NOTE
The Horiz Plug-in Compatibility switch SW6, lo-
cated on the upper portion of the internal bulk-
head immediately behind the front panel, must be
set to agree with the type of time base used.
To insert the Type 382 into the oscilloscope compartment,
turn the aluminum knob (at the front panel bottom center)
counterclockwise several turns until it stops. Then slide the
Type 382 completely into the compartment. Once the plug-
in unit is seated, turn the aluminum knob a few turns clock-
wise until it is hand-tight.
®
The Type 352 requires at least one sampling head in
order to operate. The sampling head (or heads) can be
plugged into the Type 3S2 or used remotely by use of an
extender cable.
To insert a sampling head into the right or left Channel
compartment of the Type 3S2, slide the unit completely
into the compartment, leaving the latch at the bottom of the
unit free to move. Once the sampling head is seated, push
the latch to lock the head in place. To remove, pull the
latch knob away from the panel, then pull the unit from the
compartment. See Fig. 2-1. The same system of connec-
tions applies when using the sampling head extender cable.
_ Horizontal 4
Compatibility
switch SW6
(inside)
* series : : .
‘Sampling Head Latch knob-
Fig. 2-1. Installation information and location of the Horiz Plug-In
Compatibility switch.
Mating
The Type 382 Vertical Output Amplifier gain must be
matched to the indicator oscilloscope CRT deflection factor
for accurate gain measurements. The GAIN control, a screw-
driver adjustment on the front panel adjusts the Vertical
Output Amplifier gain of the Type 3S2. Adjustment of this
GAIN control using the Type 284 Pulse Generator as a signal
source is shown under Equivalent-Time Sampling Operation
which follows. For further Gain information, refer to the
Gain Adjustment instructions later in this section.
2-1

Operating Instructions—Type 352
FIRST-TIME OPERATION
Equivalent-time Sampling Operation
Equivalent-time sampling operation of the Type 352 re-
quires
a
sampling
sweep
plug-in
unit
in
the
right
hand
com-
partment
of
the
indicator
oscilloscope.
In
this
First
Time
Operation
procedure,
a
Type
312
Random
Sampling
sweep
is
used.
The
Type
312
is
recommended
for
use
with
the
Type
382,
because
random
sampling
permits
viewing
the
signal
in
advance
of
the
triggering
event.
Such
trigger
lead-
time
is
required
by
the
Type
3S2
to
view
fast
rise
pulses
while
internally
triggering
the
sampling
sweep
unit
from
the
TRIG
OUT
connector.
The
Type
561A
Oscilloscope
is
used,
and
a
Type
284
Pulse
Generator
is
used
as
a
signal
source.
Any
S-
Series
sampling
head
can
be
used.
In
this
First
Time
Opera-
tion,
two
Type
S-1
Sampling
Heads
are
used.
If
you
are
not
already
familiar
with
the
operation
of
the
oscilloscope
and
sampling
sweep
unit,
read
the
manuals
for
these
instru-
ments before proceeding.
Single Trace
Make
sure
that
the
internally
mounted
Horiz
Plug-in
Com-
patibility
switch
SW6
is
in
the
Sampling
3T-Series
position.
See
Fig.
2-1
for
its
location.
Also
make
sure
that
the
Samples/
Div
switch
SW450
on
the
Type
3T2
bulkhead
immediately
behind
the
front
panel
is
set
to
the
Variable
(Front
Panel)
position.
Type 3S2
Horiz Plug-In Compatibil- Sampling
ity SWé6 (behind front
panel}
Display Mode CH B
NORMAL-SMOOTH NORMAL
A and B POSITION Midrange
DC
OFFSET
Midrange
(5
turns
from
(both Channels) one end}
Units/Div 200
(both Channels)
VARIABLE CAL
(both Channels}
INVERT Push in
DOT RESPONSE Midrange
(both channels)
B DELAY Midrange
TRIG OUT switch Optional
Type 312
Horiz Position Midrange
Samples/Div
9
o'clock
position
Display
Mode Normal
Start
Point
With
Trigger
Sweep
rate
100 ns
Range
1 ws
Diplay
Mag
x1
Time
Magnifier
XI
Variable Cal
Time Position Both fully clockwise
Trig Sensitivity Fully clockwise
Recovery Time Optional
Trigger Polarity +
Trigger Source Ext
Type 284
Square Wave Amplitude 1.0V
Period 1 ps
Mode Square Wave Output
Lead Time 75 ns
Connect
the
Square
Wave
Output
signal
from
the
Type
284
to
the
input
connector
of
the
Sampling
Head
installed
in
the
Channel
B
compartment
through
a
5ns
coaxial
cable.
Any
applied
signal
(to
Type
S-i)
should
be
1
volt
or
less.
This
is
the
normal
signa!
range
for
the
Type
S-1.
See
the
sampling
head
specification
of
the
Type
S-1
or
the
S-
Series
sampling
head
you
are
using
for
further
information.
Connect
the
Trigger
Output
signal
from
the
Type
284
to
the
50Q
external
Trigger
Input
connector
on
the
Type
312
through
a
5Sns
signal
delay
coaxial
cable
with
BNC
con-
nectors.
Center
the
trace
on
the
graticule
with
the
A
POSITION
control,
and
if
necessary
use
the
DC
OFFSET
control.
Ad-
just
the
Trig
Sensitivity
control
on
the
Type
312
counter-
clockwise,
then
clockwise
for
a
stable
trace.
Observe
a
square
wave
display.
If
its
amplitude
is
5
vertical
divisions,
the
Type
352
GAIN
adjustment
on
the
front
panel
is
prop-
erly
set.
If
the
amplitude
is
not
5
vertical
divisions,
adjust
the
GAIN
control
with
a
small
screwdriver
for
5
vertical
divisions.
Now
check
Channel
A
by
applying
the
input
signal
to
the
input
connector
of
the
sampling
head
installed
in
the
Channel
A
compartment.
Change
the
Display
Mode
switch
to
CH
A.
NOTE
Operating
the
sampling
head
without
the
input
connector
terminated
by
a
50
©
resistor
or
coaxial
cable
will
cause
a
vertical
shift
to
the
zero
signal
baseline
by
a
few
millivolts.
This
occurs
because
the
strobe
kickout
signal
is
reflected
from
the
open
input
connector.
The
kickout
signal
arrives
back
at
the
sampling
bridge
during
sampling
time,
while
the
bridge
is
still
conducting.
To
avoid
this,
set
the
display
zero
reference
point
with
the
input
circuit
connected,
not
before
connecting
it.
Also
use
at
least
20cm
of
airline
between
the
Type
S-1
input
and
a
fast
generator
or
circuit
that
is
sensitive
to
the
fast
Strobe
kickout
signal.
Experiment
with
the
various
Channel
B
front-panel
con-
trols,
and
notice
the
effect
of
each.
For
example,
note
the
effect
of
the
POSITION
control
in
positioning
the
display
above
and
below
the
zero
reference
level
at
the
graticule
centerline.
Return
the
Position
control
back
to
midrange,
and
turn
the
DC
OFFSET
control
counterclockwise
to
posi-
tion
the
upper
portion
of
the
square
wave
to
the
graticule
centerline.
This
new
reference
level,
set
by
the
DC
OFFSET
control,
can
be
monitored
at
the
OFFSET
X10
10
kQ
jack.
®

Now, notice that the POSITION control positions the dis-
play above and below the new reference level.
FUNCTION OF FRONT PANEL
CONTROLS AND CONNECTORS
A special removeable knob is used on the three controls A
DOT RESPONSE, B DOT RESPONSE and B DELAY allowing
these controls to be screwdriver adjusted. Knob removal
may be an operator convenience in production line appli-
cations. Pull the knob away from panel to remove. Observe
the internal spring wire orientation before replacing a knob.
The spring wire should slide into the control shaft screw-
driver slot to prevent knob slippage at the end of control
rotation.
Display Mode Selects one of the five following display
Switch modes.
CH
A The Channel A signal is displayed.
CH B The Channel BB signal is displayed.
DUAL-TRACE Both channel signals are displayed, but
each trace has one-half the normal number
of dots per sweep. The display switches
from CH A to CH B after each CH A dot,
and vice versa. While operating in Dual-
Trace, one sweep contains the same num-
ber of dots as if only one channel were
displayed.
A+ 8B The algebraic sum (A-+B as selected
with the INVERT switches) of the two Chan-
nels is displayed.
A VERT The Channel A signal is displayed ver-
B HORIZ tically and the Channel B signal is dis-
played horizontally for X-Y operation.
Functions only with sampling sweep units.
NORMAL- Selects unity loop gain at NORMAL,
SMOOTH (Red and reduces the loop gain to <0.3 at
knob concentric SMOOTH. NORMAL provides the correct
with the Display loop gain required when measuring rise-
Mode switch} time. SMOOTH reduces the effect of
random noise on the display while re-
quiring high sampling dot density for the
correct displayed risetime.
POSITION Adjust the vertical position of the A and
Controls B displays independently. (The B_ posi-
tion control becomes the horizontal posi-
tion control in the A VERT B HORIZ mode.}
DC OFFSET These controls apply internal signal offset
+1¥V Controls voltages of +1 to —1 volt to the sampling
head (unless otherwise stated on the sam-
pling head front panel}. The input signal
zero reference (related to the CRT) is the
DC Offset voltage instead of ground.
Permits all portions of a maximum -++1-volt
input signal to be positioned through the
CRT vertical ‘window’ even at a deflec-
tion factor of 2 units/div (2mV/Div with
a Type S-1 or S-2}.
The vertical window is a total of 14mV
when the deflection factor is 2mV/Div,
and 1.6 volts when the deflection factor
is 200 mV/Div. The front panel OFFSET
monitor jacks allow accurate slide-back
@3
Units/Div
Switches
VARIABLE Con-
trols (Same con-
trol knob with
INVERT
Switches)
INVERT
Switches
DOT RESPONSE
GAIN
TRIG OUT
Aor B
Switch
B DELAY
VERT OUTPUTS
A OUTPUT
.2V/DIV,
10 ka
Operating Instructions—Type 382
voltage measurements to be made of part
or all of a signal at 10X the actual offset
voltage applied to the head.
Selects calibrated deflection factor for
each Channel. The units are selected and
named on the adjacent S-Series sampling
head. For example, with a Type S-1 sam-
pling head in Channel A and the Chan-
nel A Units/Div switch set at 100, each
major division of deflection corresponds
to 100 millivolts of applied signal at the
S-1 input connector when the VARIABLE
Control is in the CAL position.
Provides + and — Uncalibrated variation
of the deflection factor between labeled
values of the Units/Div switches. Counter-
clockwise rotation decreases the display
size, increasing the deflection factor to at
least 3.43 times the Units/Div calibrated
value (display is <0.7 as large as when
VARIABLE is at CAL). Clockwise rotation
increases the display size, decreasing the
deflection factor to at least 0.4 times the
Units/Div calibrated value (display is
>2.5 as large as when VARIABLE is at
CAL).
In the Normal (pushed in) position, a pos-
itive input signal deflects the CRT beam
upward. In the pulled position the dis-
played signal is inverted. When the Dis-
play Mode switch is set to A + B, alge-
braic addition of Channels A and B is
obtained. The position of the INVERT
switches determines the polarity of each
channel before algebraic addition.
Allows the loop gain of each Channel
to be adjusted to unity when the NOR-
MAL-SMOOTH switch is in the NORMAL
position.
Matches the vertical output amplifier gain
to the oscilloscope CRT deflection factor.
(Does not affect the internal Digital Gain
accuracy.)
When the sampling head contains a trig-
ger pickoff circuit, selects the signal from
Channel A or Channel B input circuit. De-
livers the signal to the TRIG OUT jack
on the front panel. (Such signals are use-
ful for externally triggering a sampling
sweep unit). It also selects an internal
vertical signal facsimile from channel A
or B for use in internal triggering of real-
time time-base units.
Varies the time position of CH B display
over a range of af least 10ns. Time
coincidence will depend upon the time
difference of sampling heads and sampling
head extender cable units.
The Channel A facsimile signal (the same
Memory output signal that drives the Ver-
tical Amplifier) is available at this con-
2-3

Operating Instructions—Type 3$2
TEKTRONIX ©
(— \
TYPE 3S2 SAMPLING UNIT
A
POSITION
B
POSITION
DC
OFFSET
+1V
DUAL-TRACE
DC
OFFSET
+1V
CHA CHB
A VERT
B HORIZ A+B
pot GAIN B DELAY
NORMAL SMOOTH DOT
RESPONSE
©
TRIG
OUT
RESPONSE
© ~CT)s ©
os ICAL LZY-y,
P59 20 10 a S QW
POSITION 200
OF
PORTLAND, OREGON, U.S.A.
(—
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(a
—))
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mVOLTS/DIV
TYPE
S-1
TYPE
S-1
SAMPLING
HEAD
SAMPLING
HEAD
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Q
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—
RISETIME
RISETIME
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£350ps
{
TEKTRONIX
®
+5V
MAX
LTEKTRONIX
®
S
ey
GND
VERT
OUTPUTS
.
2v/DIV
A
10KQ
OFFSET OFFSET
X10
10KQ
X10
10KQ
Fig. 2-2. Control
Setup Chart.