Tektronix 7603 Operating instructions

ffitonix
COMMITTED
TO EXCELLENCE
WARNING
THE FOLLOWING
SERVICING
INSTRUCTIONS
AREFOR
USE
BY
QUALIFIED
PERSONNEL
ONLY.
TO AVOID PERSONALINJURY, DO NOT
PERFORMANY
SERVICINGOTHER
THAN
THAT
CONTAINED
IN OPERATING INSTRUCTIONS
UNLESS
YOUARE
QUALIFIED
TODO
SO.
PLEASE
CHECKFOR
CHANGEINFORMATION
ATTHEREAR
OFTHISMANUAL.
7603/R7603
Tektronix,
Inc.
P.O.
Box
500
Beaverlon,
Oregon 97077
070-1
429-00.
Product
Grouo42
oscrLLoscoPE
SERVICE
INSTRUCTION MANUAL
First
Printing
JUN 1972
Revised
DEC
1984
SerialNumber
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Copyright ' 1972 Tektronix,
Inc. Ail rights reserved.
Contents
of this
publication
may not
be
reproduced
in
any
form
without
the written
permission
of Tektronix.
Inc.
Products
of
Tektronix,
Inc.
andits
subsidiaries
are
covered
by U.S.
and
foreign
patents
and/or
pending
patents.
TEKTRONIX,
TEK,
SCOPE-MOB|LE.
ano are
registered
trademarks
of Tektronix,
Inc.
TELEQUtpMENT
is
a registered
trademark
of
Tektronix
U.K.Limited.
Printed
in
U.S.A.
Specification
and
price
change
priviteges
arereserved.
INSTRUMENT
SERIAL
NUMBERS
Eachinstrument
has
a serialnumber
ona
paiel
insert,
tag,
or stamped
on the chassis.
The
first
number
or letter
designatesthe
country
of manufacture.
The
last
five
digits
of the serialnumber
are
assigned
sequentially
and
are
uniqueto eachinstrument.
Those
manufactured
in the
UnitedStateshave
six unique
digits.
The country
of
manufacture
isidentified
as
follows:
8000000 Tektronix,
Inc.,
Beaverton,
Oregon,
USA
100000 Tektronix
Guernsey,
Ltd.,
Channel
lslands
200000 Tektronix
UnitedKingdom,
Ltd.,
London
300000 Sony/Tektronix,
Japan
700000 Tektronix
Holland,
NV,
Heerenveen.
TheNetherlands
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SECTION1
SECTION
2
SECTION
3
OPERATINGINSTRUCTIONS
Prel
iminary Information
DisplayDefinitions
Plug-in
Units
Controlsand Connectors
OperatingCheckout
Simplified
Operating
Instructions
GeneralOperating
Information
SPECIFICATION
VerticalDeflection
System
Triggering
Horizontal
Deflection
System
Cali
brator
External
Z Axis
Input
Outputs
Character
Generator
Display
(CRT)
and
Options
Power
Source
Signals
Out
Environmental
Physical
Standard
Accessories
7600-Series
System
Specifications
CALIBRATION
Test Equi
pment
Required
Calibration
Procedure
Power
Supply
Display
andZ-Axis
Vertical
Deflection
System
Triggering
System
Horizontal
Deflection
System
Calibrator
Signals
In
& Out
Readout
Operation
Readout
GateTrig'd Operation
TABLE
OF
CONTENTS
Page
1-1
1-2
t-J
1-3
1-?
1-7
1-9
2-1
2-2
22
23
23
z-+
z-4
2-5
25
z-6
2-6
2-6
7603/R7603
Service
SECTION4 CIRCUIT DESCR
IPTION
Block Diagram
Circuit
Operation
LogicFundementals
Main Interface
LogicCircuit
Trigger
Selector
Vertical
Interface
VerticalAmplifier
HorizontalAmplifier
Calibrator
and Front Panel
Switching
CRT Circuit
Low-Voltage
Power
Supply
Signal
Out Board
Readout
System
SECTION5 MAINTENANCE
Preventive
Maintenance
Troubleshoo
ting
Location
of Circuit Boards
Electrode
Configurationfor
Semiconductors
Corrective
Maintenance
SECTION6 RACKMOUNTING
Instrument
Dimensions
RackDimensions
Slide-OutTracks
MountingProcedure
SECTION
7 ELECTRICAL
PARTS
LIST
SECTION
8 DIAGRAMS
and
CIRCUtT
BOARD
ILLUSTRATIONS
SECTION
9 IV]ECHAN
ICAL PARTS
LIST
CHANGEINFORIMATION
Page
4-1
A1
a-l
z+-J
4-6
4-6
4-16
4',ts
4-20
4-21
4-23
4-24
4-27
4-31
4-31
c-l
5-2
5-4,5-5
5-7
5-10
o-l
b-l
o-l
61
31
3-4
3-5
J-O
39
J-tt
313
J-tc
J- to
317
3-18
REVJUN1981
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7603/R7603
SAFETY SUMMARY
The
general
safety
information
contained
in this
summary
is for servicing
personnel.
Specific
warnings
andcautionswill
be
foundthroughoutthe
manualwheretheyapply,but
maynot
appear
in
thissummary.
TERMS
IN THIS MANUAL
CAUTIONstatements
identifyconditionsor
practices
that
could
resultin
damage
to theequipment
or other
property.
WARNINGstatements
identify
conditions
or
practices
thatcould
resultin
personal
injury
or
loss
of
life.
AS MARKED ON EQUIPMENT
CAUTION
indicates
a personal
injuryhazardnot immediately
accessibleas one readsthe marking, or a hazard to property
includingtheequipment
itself.
DANGER
indicates
a personal
injuryhazardimmediately
accessibleas one
readsthe marking.
SYMBOLS
INTHISMANUAL
€\
(ry Static-Sensitive
Devices
,\
A This symbol
indicates
where
applicablecautionaryorother
informationisto befound.
AS MARKEDONEQUIPMENT
+ DANGER-HIgh
vortage.
Protective
ground
(earth)
terminal.
ATTENTION-refer
to manual.
WARNINGS
POWER SOURCE
This product
is intendedto operate
from a power
source
that will not apply
mare
than 250 volts rms betweenthe supply
conductorsor betweeneither
supplyconductorand
ground.
A protective
ground
connectionby
way
of the
grounding
conduc-
tor in the oower cord is essential
for safe operation.
USE THE PROPER
POWERCORD
Useonly
the power cord and connector
specified
for your
product.
Use
only a power cord that
is in
good
condition.
GROUNDING
THE PRODUCT
This
product
is
grounded
throughthe
grounding
conductorof
the
power
cord.
To avoidelectricalshock,
plug
the
power
cord
into a properly wiredreceptaclebefore
making
connections
to the
product
input
or outputterminals.
A protective
ground
connectronby
way
of
the
grounding
conductor
in the
power
cordis essential
for
safeoperation.
A
\:-/
A
tl REVDEC
1983
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7603/R7603
DANGERARISINGFROM LOSS
OF GROUND
. Upon
loss
of the protective-ground connection,
allaccessibleconductive
parts
(including
knobs
andcontrolsthat may
appear
I to
Oe
insulating),
can
render
anelectricshock.
USE THE PROPER FUSE
To avoidhazard,use
only
the fuse
specified
in
the
parts
listfor
your
product,
and
whichis
identicalin type,voltage
rating,
and
currentrating.
DO NOT OPERATE IN EXPLOSIVE
ATMOSPHERES
To
avoidexplosion,
do not operatethis
product
in an
atmosphereof explosive
gases
unlessit
has
beenspecifically
certifiedfor
suchooeration.
DO NOT SERVICE ALONE
Do not perform internal
serviceor adjustment
of this product unless
another
person
capable
of rendering first aid and
resuscitationis
oresent.
USE CARE WHEN SERVICING WITH POWER
ON
Dangerousvoltages
exist
at several
points
in this
product.
To
avoid
personal
injury,
do not touch
exposed
connections
and
components
while
power
is
on.
Disconnect
power
beforeremoving
protectivepanels,
soldering,or replacing
components.
SILICONE
GREASE HANDLING
Handlesilicone
grease
with
care.
Avoid
getting
the silicone
grease
in
your
eyes.Washhands
thoroughly
after
usingsilicone
grease.
il|
ADD
DEC1983
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7603 Features
The TEKTRoNIx 7603 oscilloscope
is a solid
state,
light
weight instrument
designed
for general-purpose
measuring
applications.
This instrument
has three plug-in
compartments
that accept
TEKTRONIX 7-series
plug-in
units
to form a
complete measurement
system.
The nrvo
plug-in
compartments
on the left are
connected
to the vertical
deflection
system.
The right plug-in compartment is connected
to the horizontal deflection system.
Electronic
switching
between
the vertical
plug-in
compartments
allows
a multi-trace
vertical
display.
The flexibility
of this
plug-in
feature
and
the
variety
of plug-in
units available
allow this system
to be usedfor many measurement
applications.
ln addition,
the instrument
contains
a
readout
system
to provide
a CRT display
of alphanumeric
information
from the plug-in
units.
Data
such
asdeflection
factor,
sweep
rate,
etc.
can be
encoded
and displayed
on the
CRT.
This instrument
features
a large-screen,
8 X 10 division
display;
each
division
equals
1.22
centimeters.
The
CRT provides
small
spot size
and fast
writing speed.
Regulated
DC power supplies
assure
that performance
is
not affected
by variations
in
line
voltage
and frequency,
or by changes
in the load
due
to the
varying
power
requirements
of the
plug-in
units.Maximum
power
consumption
is
about
170watts
(60
hertz,
115_volt
line).
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AUG
1983
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OPERATING
INSTRUCTIONS
General
To effectively use the 7603, the operation and
capabilities
of the instrument must
be known.
This
section
describes
the
operationof thefront-
andrear-panel
controls
andconnectors
and
gives
simplified
and
general
operating
information.
PRELIM
INARY INFORMATION
Operating Voltage
WARI'TG
This instrument is designed for operation from a
power source with its neutral at or near earth
(ground
) potential with a separate safety-earth
conductor. lt is not intended for operation from two
phases
of a multi-phase
system,
or across
the legs
of a
single-ph
ase,three-w
ire system.
The 7603
can be operated
from either
a 110-volt
or a
. 220-volt
nominal line-voltage
source.ln addition.
three
) operatingranges
can
be selected
within eachnominal
line
voltage
source.The
voltage-selector
jumper
on the Rectifier
board
(see
Fig. 1-1)
allowsselection
of the operating
voltage.To convert
the instrument
from one regulating
range
to another,first disconnect
the instrument
from the
power
source.Then,
slideout the
power
unit as
described
in the Maintenance
section.Remove
the voltage-selector
jumper
and re-installit on the
setof pins
which represent
the desiredregulating
range.
Select
a range which is
centered
about the average line voltage
to which the
instrument
is
to be
connected
(see
Table1
-
1
)
.
TABLE
1-1
Regulating
Range
andFuseData
Pins Regulating
Range
Selected 110-volts
nominal 220-volts
nominal
LOW 90to 110
volts 180to 220
volts
MED gg
to 121volts 198
to 242volts
Hl 108
to 132volts 218
to
262
volts
LineFuse 3.2
A slow-blow 1.6A slow-blow
To convert
from 11O-volts
to 220-volts
nominal
line
I voltage,
or viceversa,remove
the voltage-selector
jumper
z and replace
it with the spare
jumper (stored
on pins
adjacent
to voltage selector
area).The jumpers
arecolor-
REV
NOV
1981
I
Section 1
-7 603lR7
603
Service
Fig. 1-1. Locationsof voltage-selector jumper,
spare
jumper,
and
ALT FUSE
in
power
unit (7603
strown).
coded to indicate the nominal voltage
for which they are
intended;
brown for 110-volt
nominal
operation
and
red
for
220.uolt nominal
operation.
Change
the line fuse
to provide
protection for the selectednominal line voltage.
Use the
fuse located in the ALT FUSE holder on the Rectifier
board
(see
Fig. 1-1)
or seeTable
1-1for value.
Also,
change
the line-cord
plug to match the power-source
receptacle
or
use
a suitable
adapter.
Power
Cord
Conductor
ldentif
ication
Conductor
Ungrounded
(Line)
Grounded
(Neutral
)
Grounding
(Earthing)
Color Alternate
Color
Green-Yellow Green-Yellow
The 7603 is
designed
to be used
with a three-wire
AC
power
system.lf a three-
to two-wire
adapteris
usedto
connect
this instrument
to a two-wire
AC
power
svstem,
be
sure
to connect
the ground lead
of the adapterto earth
(ground).
Failure
to complete
the
ground
systemmay
allow
the chassis
of this
instrument
to beelevated
above
qround
potential
and
pose
ashockhazard.
Operating Temperature
The 7603 can be operated
where the ambient
air
temperatureis between
0"C and
+50oC.
This instrument
Brown
Bl
ue
Black
White
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Operating
Instructions-7603/R7603 Service
can be stored
in ambient temperaturesbetween
-55"C and
+75oC.
After storageat temperaturesbeyondthe
operating
limits, allow the chassis
temperatureto come within the
operating
limitsbefore
power
is
applied.
The 7603 is cooled
by convection
air
flow through the
instrument. Componentswhich require the most cooling
are mounted externally on a heat radiator at the rear.
Adequate
clearance
must be
provided
on all sidesto allow
heatto be
dissipated
from the
instrument.
Do not block or
restrictthe air flow through the holesin the cabinet or
the
heat radiatoron the rear.Maintainthe clearance
provided
bv the feet on the bottom and allow about two inches
clearance
on the
top, sides,and rear
(more
if possible).
The R7603 is cooled by air drawn in through the air
filter
on the rear
panel
and
blown
out through the
holeson
the right side.
Adequate clearancemust be provided
at
these locations.Allow at least
one and one-half
inches
clearance
behind
the air
filter and at leastone inch on the
right
side.
A thermal cutout in this instrument
provides
thermal
protection and interruptsthe power to the instrumentif
the internal temperature
exceeds
a safe operating
level.
Power is automatically restored when the temperature
returns to a safe
level.
Operation
in confined
areasor in
close
proximity to heat-producinginstrumentsmay cause
the thermalcutout to open
more
frequently.
Operating
Position
A bale-typestand is mounted on the bottom of this
instrument.
This stand permits the 7603 to be tilted up
about
i0o for more convenient
viewing.
Rackmounting
Instructions
and
dimensional
drawingsfor rackmounting
the R7603 are locatedin Section
6 of the servicemanual.
DISPLAYDEFINITIONS
General
The following definitionsdescribethe types
of displays
which can be obtained
with a 7603 Oscilloscopesvstem
with real-time
amplif
iers,
time-baseunits,
or combinations
of these.Useof special
purposeplug-in
units may resultin
different types of displays, which are defined in the
instruction
manualsfor thesespecialunits. The following
termlnology
will
beusedthroughout
this
manua,.
1-2
Alternate
Mode
A time-sharing
method
of displayingtwo or more
signals
with a singlecathode-ray
tube beam.
Channelswitchingis
sequentialandoccurs
at the end
of eachsweep.
Chopped
Mode
A time-sharing method
of displaying two or moresignals
with a singlecathode-raytube beam.Channelswitchingis
sequential
and occurs
at a rate determinedby an internal
clock
generator
(chopping
rate).
NOTE
See Simplified Operating lnstructions in this section
for set-up information to obtain each of the following
displays.
SingleTrace
A displayof a single
plot produced
by one vertical
signal
anoonesweep.
Dual
Trace
A display
of two plots
produced
by two verticalsignals
and one sweep.
DelayedSweep
- SingleTrace
A displayof a single
plot
produced
by one vertical
signal
and a delayed sweep.
Two sweeps
are usedto produce
this
display;the sweeps
are operatingwith a delaying/delayed
relationship
where one sweep
(identified
as
the delaying
sweep)
delays the start of the second
sweep
(identified
as
the delayedsweep).
Delayed
Sweep
- Dual
Trace
A display of two plots produced
by combining
two
verticalsignalsand a delayedsweep.Two sweepsareused
to produce this display;the sweepsare
operatingwith a
delaying/delayed relationship. Each vertical signal is
displayedagainstthe delayedsweep.
X.Y
A plot
of two variables,neither
of which represents
time.
X refersto the horizontal
axisand
Y refers
to the vertical
ax
is.
@
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PLUG.IN
UNITS
lGeneral
The 7603
is
designedto acceptup to threeTEKTRONIX
7-series
plug-in
units.
This
plug-in
feature
allows
a
variety
of
display combinations
and also allows selection
of band-
width, sensitivity,displaymode,
etc. to meet the measure-
ment requirements.In addition, it allowsthe oscilloscope
system to be expanded to meet future measurement
requirements.
The overall capabilities
of the resultant
systemare
in large
part
determinedby the
characteristics
of
the plug-in selected.For completeinformation
on plug-ins
availablefor use with this instrument,
see the current
Tektronix,
Inc. catalog.
Plug-ln
Installation
To install a plug-in unit into one of the plug-in
compartments,alignthe slots
in the top and bottom
of the
plug-in with the associated
guide rails in the plug-in
compartment.Pushthe plug-in
unit firmly into the
plug-in
compartmentuntil it locksinto
place.
To remove
a
plug-in,
pull
the releaselatch
on
the
plug-in
unit to disengageit and
pull
the unit out of the plug-in compartment.Plug-in
units
can be removed or installed without turninq off the
instrument
power.
It is not necessarythat all of the plug-in
compartments
be filled to operatethe instrument; the only plug-in
units
needed
arethoserequiredfor the measurement
to be made.
lHowever,
at environmentalextremes,
excess
radiationmay
l
' be radiatedinto or out of this
instrument
throughthe
open
plug-in
compartments.Blank plug-in panels
are available
from Tektronix, lnc. to cover the unused
compartment;
order
TEKTRONlX PartNo.016-0155-00.
When the 7603 is calibrated in accordancewith the
calibration
proceduregiven
in this instruction
manual,the
verticaland horizontal
gain
are standardized.This allows
calibrated
plug-in
units to be changedfrom one plug-in
compartment
to another without recalibration.However,
the basiccalibrationof the individual
plug-in
units should
be checkedwhen
they are
installedin thissystem
to verifv
their
measurement
accuracy.Seethe operatinginstructions
section
of the plug-in unit instruction manual for verifi-
cation orocedure.
Special
purposeplug-in
units may have
specificrestric-
tionsregarding
the
plug-in
compartmentsin
which
they can
be installed. This information
will be
given
in the instruc-
tion manual
for these
plug-in
units.
NOTE
Later production of rackmount oscilloscopes are pro-
vided with support posts between the individual plug-
in compartments. A post or posts
must be removed if
I a multiwidth plug-in is to be installed. To remove a
/ post, unfasten the screws that secure it at the top and
bottom of the plug-in housing.
REV
C.
MAY1978
OperatingInstructions-7603/R7603
Service
CONTROLS
AND
CONNECTORS
The major
controls
for operation
of the 7603
arelocated
on the front oanel of the instrument.
Figs.
1-2
and 1-3
provide
a brief description
of each
control
ano connector.
More
detailedoperatinginformation
is
given
under
General
OperatingInformation.
OPERATING
CHECKOUT
General
The following OperatingCheckout
provides
a means
of
verifying
instrument
operation
and basic
calibrationwith-
out removing
the coversor making
internal
adjustments.
Since
it demonstrates
the use
of all controls and connec-
tors, it can also be used
to provide
basic
training
on the
operationof this instrument.lf re-calibration
of the 7603
appearsto be necessary,
see
the Calibration
procedure
in
Section3 of this manual.
lf re-calibration
of a plug-in unit
is indicated,
see
the instructionmanual for the appropriate
plug-in
unit.
Set-UpInformation
1. Set
the front-panelcontrols
asfollows:
INTENSITY
FOCUS
BEAMFINDER
GRATICULEILLUM
VERTMODE
TRIG
SOURCE
POWER
Counterclockwise
Mid
range
Pressedin
As
desired
LEFT
VERT
MODE
Pushed
in
2. Connect
the 7603 to a
power
source
which meets
the
voltage
and
frequency
requirements
of this
instrument.
The
applied voltage should
be near the center
of the voltage
rangemarked
on the rear
panel
(see
OperatingVoltage in
this sectionfor information
on converting
this instrument
from oneoperatingvoltageto another).
3. InstallTEKTRONIX 7A-series
amplifier
units into
both the left and right vertical plug-in compartments.
Install a 7B-series
time-base
unit into the horizontal
compartment.
4. Pull the POWER
switch
to turn the instrument
on.
Allow severalminutes
warmup
before
proceeding.
5" Set both vertical
unitsfor a deflection
factor
of two
volts/division
and centerthe vertical
position
controls.
Set
both
vertical
unitsfor AC input
coupling.
6. Set the time-base unit for a sweep rate of one
millisecond/division
in
the
auto,
internal
triggermode.
1-3
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FUNCTIONS
OF
CONTROLSAND CONNECTORS
Operating
Instructions-7603/R7603
Service
Front
Panel
1. INTENS|TY-Controls brightnessof the display. Control is
inoperative when horizontal compartment is vacant.
2. READOUT-Turns on the readout display and controls the
readout intensity,
3. FOCUS-Provides adjustment for optimum display definition.
4. GRATICULE ILLUM-Controls graticule
illumination.
5. BEAM FINDER-When pressed.
the scan
is limited to within
the graticule area.
6. TRIG SOURCE-Selects
sourceof internal trigger signal
for
the
time base
plug-in
in the horizontalcompartment.
LEFT: The triggersignal
is
obtained
from the plug-in unit in
the left vertical compartment only.
VERT MODE: Triggersignalautomatically
follows
the vertical
display except in CHOP and ADD; then the trigger signal is the
algebraic sum of the signals from the left and right vertical
compartments.
RIGHT: The triggersignal
is
obtained
from the
plug-in
unit in
the right vertical compartment only.
7. POWER-
Switch: Controls
power
to the
instrument.
Light: lndicates that the power saritch is on and that the
instrument is
connected to a line voltage
source.
8. CALIBBATOB-Calibrator outpur pin jacks (4V,0.4V,40
mV, groundl. Positivegoing pulse or DC voltage selected by
changing internal jumper. Repetition rate is approximately one
kilohertz.
9. VERT MODE-Selects vertical mode of operation.
LEFT: Signals from plug-in
unit in left vertical
compartment
aredisplayed.
ALT: Signals
from plug-in units in both the left and right
vertical compartments are displayed (dual tracel. Display
slrvitchedbetween vertical plug-in units after each
sareep.
ADD: Signals
from plug-in units in both the left and right
vertical compartments are algebraically added and the sum is
displayedon the
CRT.
CHOP: Signals
from plug-in units in both the left and right
vertical compartments are displayed (dual tracel, The display is
switched between vertical plug-in units at approximately one
megahertz
rate.
RIGHT: Signals from plug-in unit in right verticalcompart-
ment isdisplayed.
10. CameraPower {Not Labeledl-Three-pin
connectoron CRT
bezel provides power output (+15 Vl. Receivesremote single
sweep
reset signal from compatible camera systems, and a ground pin
connection.
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1-4
Fig, 1-2, Front-panel controls and connectors.
All manuals and user guides at all-guides.com

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Rear
Panel
1. FUSE-Line voltage
fuse
for instrument.
2. SS READY OUT-Provides an external single
sweep ready
indicator signal
after the singles,veep
hasbeen reset.
3. EXT S S RESET lN-Remote singlewveep
reset.
4. EXT Z AXIS lN-lnput connector
for intensitymodulation of
the cRT display.
5. VERT SIG OUT-Vertical signalselectedby TRIG SOURCE
switch
(LEFT.
RIGHT,
ALT andADDI.
6. GATE OUT-Gate signal selected by gate selector switch
(MAlN,
AUXILIARY, and
DELAYI.
7. + SAWTOOTH OUT-Positive-going sawtooth from time-base
unit.
@
Fig, 1-3, Rear-panelcontrols and connectors.
1-5
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Operating Instructions-7603/R7603 Service
7. Advance
the INTENSITY control
until the
traceis
at
the desired
viewing level (near midrange).
Advance
the
READOUT until the readout display is at the desired
viewing
level.
8. Connect
the 4 V calibrator pin-jack
to the input of
the left
vertical
unit with a
BNC
to pin-jack
cable
(supplied
accessory).
Display
Focus
9. Adlust the FOCUS
control for a sharp,
well-defined
display
over the entire trace
length.
lf a properly
focused
display
cannot
be obtainedwith the FOCUS
control.
the
internal Astigmatism
adjustment
must be re-set;
see the
Calibration
section
of thismanual.
Trace
Alignment
10. Disconnect
the input signal
and position
the trace
with the left vertical
unit position
control so it coincides
with the center
horizontal
line
of the
graticule.
lf the trace
is
not parallel
to the center
horizontal
line
of the
graticule,
see Trace Rotation adjustment procedure
in Calibration
section.
GraticuleI
llumination
11. Rotate
the GRAT ILLUM control
throughout
its
range
and notice
that the illumination
of the
graticule
lines
increases
as the control is
turned
clockwise
(most
obvious
with tinted
f
ilter installed).
Set the control
so
the
qraticule
lines
areilluminated
asdesired.
Vertical
Deflection
System
12. Connect the 4 V calibrator signal to the input
connector
of the left
vertical
unit with the BNC
to pin-iack
cable.
Set both vertical
units for a deflection
factor
of one
volt/division. The display amplitude should be four
divisions.
Note
the exact
display
amplitude
for step
15.
13. Notice that the position control of onlV the left
vertical
unit has
an effect
on the position
of the
display.
Position
the
displayto the upper
half
of the
graticule.
14. Press
the RIGHT button of the VERT MODE
switch.
Remove
the calibrator
signal
from the left
vertical
and connect
it to the right
vertical.
The
display
amplitude
should
be four divisions
within 0.12 division.
Note the
exact
display
amplitude
for the next
step.
i5. A correct
displayin both steps
12
and 14 indicates
that the 7603 Vertical
Deflection
System
and
the vertical
1-6
plug-in
units
arecalibrated.
lf the
displays
noted
previously
are both outside
the
given
tolerance
in
the same
direction
(i.e.,
high or low), the Vertical
Gain
or 4 Volts
calibrator
adlustment
probably
needs
re-adjustment.
Otherwise.
check
the
calibration
of the vertical
plug-in
units.
16. Notice that the position
control of only the right
vertical
unit has
an effect on the position
of the
display.
Position
the display
to the lower
half of the
graticule.
Set
both vertical units for a deflection factor of two volts/
division.
Connect
calibrator
signal
to both vertical
units
bv
using
a
dual
input
coupler.
17. Press
the ALT button of the
VERT MODE
switch.
Notice
that two traces
are
displayed
on the
CRT.
The
top
trace is produced by the left vertical
unit and the bottom
trace is produced by the right vertical
unit. Set
the sweep
rate to 50 milliseconds/division.
Notice that the display
alternates
between the left and right vertical units after
each sweep. Turn the sweep rate switch throughout its
range.
Notice
that the display
alternates
between
vertical
units
at allsweep
rates.
18. Press
the CHOP
button of the VERT MODE
switch.
Turn the sweep rate throughout its range.
Notice that a
dual-trace
displayis
presented
at all
sweep
rates,
but
unlike
ALT both vertical
units are displayed
on eachsweep
in
a
time-sharing
manner. Return the sweep rate to 0.5
milIisecond/d
ivision.
19. Press
the ADD button of the VERT MODE
switch.
The display
should
be four divisions
in amplitude.
Notice
that the position
control of either
vertical
unit moves
the
display.
Return
the
VERT MODE
switch
to LEFT.
Triggering
20. Center
the
display
on the
CBT with the left
vertical
unit position
control.
Disconnect
the input
signal
from
the
right
vertical
unit input connector.
Sequentially
press
allof
the VERT MODE switch buttons. Notice that a stable
display is obtained in all positions
of the VERT MODE
switch
(straight
linein RIGHT position).
21. Press
the LEFT button of the TRIG SOURCE
switch.
Again,
sequentially
press
all of the VERT MODE
buttons. Notice that the display is again
stable in all
positions,
as
in
the
previous
step.
22. Press
the RIGHT button of the TRIG SOURCE
switch.Sequentiallypress
all of the VERT MODE buttons
and notice
that a stable
display
cannot
be
obtained
in
any
position.
This is
because
there is no input
signalconnected
@
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to the right vertical
unit. Returnthe
TRIG SOURCEswitch
to VERT MODE. Remove calibrator signal from left
verticalunit and connect it to right vertical
unit. Repeat
steps
20 ro 22. The trigger signalwill come from right
vertical.
When the LEFT button is pressed of the TRIG
SOURCE switch the displav
is not stablebecausethere is
no input signal
connectedto the left vertical.Return the
TRIG SOURCEswitch
to VERT
MODE.
Horizontal
Deflection
System
23. Position the start of the sweepto the left
graticule
linewith the
time-baseunit position
control.
24. Connect a 10X probe to the input of the right
vertical
unit. Set the right vertical unit for a deflection
factor of 10 volts/divisionand
setthe VERT MODE switch
to RIGHT. Set the time-base
unit for a sweeprateof five
milliseconds/div
ision.
25. Connect the probe tip to a line-voltagesource.The
display should show three complete cycles over the 10
divisionswithin 0.3 division.
A correctdisplay indicates
that the 7603 Horizontal Deflection System and the
time-base
plug-in
unit are
correctlycalibrated.
lf the display
is outside the given tolerance, either the 7603 or the
time-base
unit needs to be recalibrated.
Refer to the
Calibration
section of this manual. and to the time-base
unit manualfor adjustment
procedure.
NOTE
This step is based on an accurate 60-Hertz line
frequency. For other line frequencies, this procedure
will need to be changed accordingly.
26. Disconnect
the probe
from the line-voltage
source
and the right
vertical
unit
and
connectthe
probe
to the
left
vertical
unit. Set the VERT MODE
switch
to LEFT andset
the time-base
unit for a sweep rate of 0.5 millisecond/
division.
Beam
Finder
27. Set the deflectionfactor of the left vertical unit to
0.1 volt/division.
Notice that a square-wave
display
is not
visible.since
the deflection exceedsthe scan areaof the
CRT.
28. Pressand
hold the BEAM FINDER switch.Notice
that the display is returned to the viewing area in
compressedform. Increasethe vertical and horizontal
deflectionfactorsuntil the displav
is
reducedto abouttwo
divisionsverticallyand
horizontally
(when
the horizontal
unit is operated
in the time-base mode, change
only the
REVB SEP1979
OperatingInstructions-7603/R7603 Service
deflection factor of the vertical
unit).
Adjust
the position
controls
of the displayed
vertical
unit and the time-base
unit to centerthe compresseddisplay
aboutthe centerlines
of the
graticule.
Release
the
BEAM FINDER
switch.Notice
that the displayremainswithin the viewing
area.
Z-Axislnput
29. lf an external signal is
available
(five
volts
peak-to-
peak
minimum at two megahertz
or less),the function
of
the EXT Z AXIS input can be demonstrated.Connect
the
external
signalto both the input of the right vertical
unit
and the EXf Z AXIS connectorwith two BNC
cables
anda
BNC T connector.Set the VERT l\4ODE
switchto RIGHT
and set the vertical unit for a deflection factor of two
volts/division.Set
the
time-base
unit for a sweeD
ratewhich
displaysseveralcycles
of the signal.Adjust the
amplitudeof
the signal
generator
until intensitymodulation
isvisible
on
the display.
The positivepeaks
of the waveformshouldbe
blanked
out and the negative
peaks
intensified.Notice
that
the setting of the INTENSITY control determinesthe
amountof intensitymodulation that isvisible.
30. Disconnect the signal from the EXT Z AX lS
connector,but leaveit connected
to the right vertical
unit
input.
Check
that peak-to-peak
amplitude
of the displayed
signal
is
four
divisions
maximum.
31. This completes
the Operating
Checkout
procedure
for the 7603. Instrument
operationsnot
explained
here,
or
operationswhich need further explanation
are discussed
under
GeneralOperatingInformation.
SIMPLI
F
I
ED
OPERATINGINSTRUCTIONS
The following information
is
provided
to aid in
quickly
obtaining the correct setting for the 7603 controls to
present
a
display.The operator
shouldbe familiar
with the
complete function and operation of this instrument
as
described
elsewhere
in this section before using this
procedure.
For detailed operating information for the
plug-in
units,see
the
instruction
manuals
for the
applicable
un
its.
Single-TraceDisplay
The following procedure
will provide a display
of a
single-trace
verticalunit against
one time-base
unit. For
simplicity
of explanation,
thevertical
unit isinstalled
in
the
left vertical
compartment.The right vertical
compartment
canbe usedif
the
procedure
is
changed
accordingly.
1. Install
a 7A-series
com
partment.
unit in the left
1-7
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Operating
Instruction
s-7603/R7603
Service
2. Press
the LEFT
button
of theVERT
MODE
switch.
3. Install a 7B-series
time-base
unit in the horizontal
com
partment.
4. Press
the VERT MODE
button
of the
TRIG
SOURCE
switch.
5. Connect the signal
to the input connector
of the
vertical
unit.
6. Set the vertical unit for AC input coupling and
cal
ibrated
def
lection
factors.
7. Set the time-base
unit for auto mode, internal
triggering
at a calibrated
sweep rate of one millisecond/
d
ivision.
8. Advance
the INTENSITY control until a display
is
visible.
(lf no display
isvisible
with INTENSITy
at
about
midrange,
press
and hold the BEAM FINDER switch
and
adjust the vertical
deflection
factor until the display is
reduced in size vertically;
then center the compressed
display with vertical and horizontal position controls;
release
the
BEAM FINDER.)
Adjust
theFOCUS
control
for
a well-def
ined
display.
Adjust Readout
INTENSITy for the
desired
viewinglevel.
9. Set the
vertical
deflection
factor
andvertical
position
control for a display
which remains
within the qraticule
areavertically.
10. lf necessary,
set
the time-base
triggering
controls
for
a stable
display.
11. Adjust the time-base
position
control
so
the display
begins
at the left edge
of the graticule.
Set
the time-base
sweep
rate
to display
the
desirednumber
of cyctes.
Dual-Trace
Display
The following procedure
will provide
a display
of two
slngle-trace
vertical
units
against
one time-base
unit.
1
. Install 7A-series
vertical
units in both vertical
plug-in
com
partments.
2. Press
the LEFT
button
of theVERT
MODE
switch.
1-8
3. Install a 7B-series
time-base
unit in the horizontal
com
partment.
4. Press
theVERT
MODE
button
of theTRIG
SOURCE
switch.
5. Connect
the signal
to the input connectors
of the
vertical
units.
6. Set the vertical units for AC input coupling
and
calibrated
deflection
factors.
7. Set the time-base
unit for auto mode, internal
triggering
at
a
sweep
rate
of one millisecond/division.
8. Advance
the INTENSITY control until a display
is
visible.
(lf no display is visible
with lNTENSlry at
midrange,
press
andhold
BEAM FINDER switch
and
adjust
vertical
deflection
factor until display is reduced
in size
vertically;
then center
compressed
display
with vertical
and
horizontal position controls;
release
the BEAM FINDER
switch.)
Set
the FOCUS
control
for a
well-defined
display.
9. Set
the left
vertical
unit
deflection
factor
for
a display
about four divisions
in amplitude.
Adjust the left
vertical
position control to move this d
isplay
to the top of the
graticule
area.
10. Press
the RIGHT button of the VERT MODE
switch.
1
1. Set the RIGHT vertical
unit deflection
factor
for a
display
aboutfour
divisionsin
amplitude
(if
display
cannot
be located,
use BEAM FINDER switch).
position
this
display
to the bottom of the
graticule
area
with the right
vertical
unit position
control.
12. Press
the ALT or CHOP
button
of the
VERT
MODE
switch. A dual-trace
d
isplay
of the signal
from the left
vertical
and right
vertical
plug-in
units
should
be
presented
on the CRT.
(For
more information
on choice
of dual-trace
mode,
seeVertical
Mode
in
this
section.)
13. lf necessary,
adjustthe
time-base
triggering
controls
f
or a stable
display.
'l
4. Adjust
the time-base
position
control
so
thedisplay
begins
at the left edge
of the graticule.
Set
the
time-base
sweep
rate
for the
desiredhorizontal
display.
@
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Delayed
Sweep
- Single
Trace
) fne following procedure
will provide
a delayed
sweep
display
of a single-trace
vertical
unit.
1. Follow the complete procedure given under
Single-Trace
Displays.
2. Be surethe time-base
unit installed
in the
horizontal
compartment is a dual time-base
with delaying/delayed
caoabilities.
3. Follow the procedure
given
in
the instruction
manual
for the dual time-base
unit to obtain a delayed-sweep
display.
Delayed
Sweep
- Dual
Trace
The following procedure
will provide
a delayed-sweep
display
of two single-trace
vertical
units.
1. Follow the complete procedure
given under Dual-
Trace
Display.
\
j 2. Be sure the time-base
unit installed
in the horizontal
' compartment
is
a dualtime-base
unit with delaying/delayed
capabi
Iities.
3. Follow
the procedure
given
in
the
instruction
manual
for the dual time-base
unit to obtain a delayed-sweep
display.
X-Y
Display
The following
procedure
will provide
an X-y display
(one
signalversus
anotherrather
than
against
time).
NOTE
Some 7B-series time-base units have provisions for
amplif ier operation in the X-Y mode; see X-Y
operation in this section for details of operation in
this manner.
'l
. Install
7A-series
amplifier units in both the left
vertical
and
thehorizontal
compartments.
2. Press
the
LEFT
button
of
theVERT
MODE
switch.
@
Operating Instructions-7603/R7603 Service
3. Connect the X-signal
to the amplifier
unit in the
horizontal
compartment.
4. Connect
the Y-signal
to the
vertical
compartment.
amplifier
unit in the left
5. Set both amplifier
units
for AC input coupling
and
calibrated
def
lection
factors.
6. Advance
the INTENSITY control until a display is
visible.
(lf no display is visible,
press
and hold BEAM
FINDER switch
and adjustthe def
lection
factors
of both
amplifier units until display is reduced in size both
vertically
and horizontally;
then
center
compressed
display
with the position controls;
release
the BEAM FINDER
switch.) Adjust the FOCUS control for a well-defined
display.
GENERAL
OPERATING
INFORMATION
Intensaty
Control
The setting
of the INTENSITY control mav affect
the
correct
focus of the d
isplay.
Slight
re-ad
justment
of the
FOCUS
control
may be necessary,
when the intensity
level
is
changed.
To protect
the CRT phosphor;
do not
turn the
INTENSITY control higher
than necessary
to provide a
satisfactory
display.
The light
filters
reduce
the observed
light
output from the
CRT. When
using
these
filters,
avoid
advancing
the INTENSITY control to a setting
that may
burn the phosphor.
When
the highest
intensity
display
is
desired,
remove
the
filters
and
use
only the clear
faceplate
protector (permanently
installed
behind
bezel).
Apparent
trace intensity can also be improved in such cases
bv
reducing
the ambient
light level
or using
a viewing
hood.
Also,
be
careful
that the INTENSITY
control
is
not
set
too
high
when changing
the time-base
unit sweep
rate
from a
fast to a slow sweep
rate,
or when changing
to the X-y
mode
of operation.
The instrument
incorporatesprotection
circuitry
which automatically
reduces
the
displayintensity
to a lower level
when the time-base
unit is
set
to a slow
sweep
rate. This reduces
the danger
of damaging
the CRT
phosphor
at these
slower
sweep
rates.
Display
Focus
The FOCUS
control allows
adjustment
for best
defini-
tion of the
CRT
display.The
Readout
intensity
should
be
turned on, when adjusting the Focus control. Slight
re-adjustment
of this control may be necessarV
as the
display
conditions
change.lf a properly
focused
display
cannot
be obtained
with the FOCUS
control,
the internal
Astigmatism
adjustment
must
be
re-set;
see
the Calibration
section
of thismanual.
1-9
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Operating
Instructions-7603/R7603
Service
Graticule
The graticule
of the 7603 is marked
on the inside
of the
faceplate of the CRT, providing accurate, no-parallax
measurements.
The graticule is
divided into eight vertical
and ten horizontal
divisions.Each
division is 1.22 centi-
meters
square.
In addition,
each major division
is
divided
into five minor divisions.
The vertical gain
and
horizontal
timing
of the plug-in units
arecalibrated
to the
graticule
so
accuratemeasurements
can be made from the CRT. The
illumination
of the
graticule
lines
can be varied
with the
GRATICULE ILLUM control.
NOTE
Two types of crt graticules have been used in some
Tektronix orcillorcopes. One graticule has 0% and
100o1'risetime reference points that are separated by
6 vertical graticule divisions. The other graticule has
the 0% and 100% risetime reference points separated
by 5 vertical divisions. ln your manual, illustrations
of the crt face or risetime measurement instructions
may not correspond with the graticule markings on
your oscilloscope.
Fig. 1-4
showsthe
graticule
of the 7603 anddefines
the
various
measurement
lines.The terminology
defined
here
will be usedin all discussionsinvolvinggraticule
measure-
ments.Notice
the 0%,
1oyo,goyo
and 100%
markings
on
the
left side
of the graticule. These
markings
are
provided
to
facilitate
risetimemeasurements.
LightFilter
The tinted filter
provided
with the 7603 minimizes
light
reflectionsfrom the face
of the CRT to improve
contrast
when
viewing
the
displayunder
high
ambientlight
condi-
tions. This filter should be removed
for waveform
photo-
graphs
or when viewing high writing rate displays.To
remove
the filter,
loosenthe
two screws
on
the
riqht side
of
Fig, 1-4, Definition of measurement lines on 7603 graticule,
1-10
the bezel
and remove
the bezel.Remove
the
tinted
filter;
leave
the clear plastic
faceplate
protector installed
and
replace
the bezel.The faceplate
protector
should
be left in
place at all times to protect the CRT faceplate
from
scratches.
An optional mesh filter is available
for use
with the
7603. This filter provides
shielding
against
radiated
EMI
(electro-magnetic
interference)
from the face
of the
CRT. lt
also serves
as a light
filter to make
the
trace
more
visible
under high
ambient light
conditions.
The mesh
f
ilter
fits in
place
of the plastic
CRT mask
and the tinted filter.
BeamFinder
The BEAM FINDER switch provides
a means
of locating
a display
which overscansthe viewing
area
eithervertically
or horizontally. When
the BEAM FINDER switchis
pressed
and held, the display is compressed
within the graticule
area.
Release
the BEAM FINDER switch to return
to a
normal display. To locate
and reposition
an overscanneo
display,
usethe
following
procedure:
1. Press
andholdthe BEAM
FINDER
switch.
2. Increase
the vertical
and horizontal
deflection
factors
until the vertical deflection is reduced to about two
divisions
and the horizontal
deflection
is
reduced
to about
four divisions (the horizontal deflection needs
to be
reduced
only
when
in
the X-Y mode
of operation).
3. Adjust
the vertical
andhorizontal
position
controls
to
center
the
display
about the vertical
and horizontal
center
Iines
of th
e oraticu
le.
4. Release
the BEAM FINDER switch;
the display
shouldremain
within
theviewino
area.
Readout
Modes
The characters
of the readout
display
arewritten
by
the
CRT beam
on
a time-share
basiswith signal
waveforms.
The
Readout system operates in a free running mode to
randomly interrupt the waveform
display
to present
the
readout
characters.
The readout
system
can
also
operatein
a GATE TRIG'D mode.No readout
signalis
produced
until
after
the sweephas
occurred.
In this mode
the
sweep
musr
run
to have
the readout
displayed.
DisplayPhotography
A permanent
record
of the CRT
display
can
be
obtained
with an oscilloscope
camera system. The instruction
manuals for the TEKTRONIX Oscilloscope
Cameras
include complete instructions for obtaining waveform
photographs.
The following
specific information
appliesto
the 7603.
(
,0
REV
C
SEP1979
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The CRT bezel
of the 7603 provides integral
mounting
for a TEKTRONIX Oscilloscope
Camera.The three
pins
;located
on the left side
of the CRT bezel
connect
power
to
compatiblecamera
systems.
lt also
receivescontrol
signals
from TEKTRONIX automatic cameras
to allow camera-
controlled
single-shot
photography
(see
camera
manualfor
furtherinformation).
VerticalMode
Left and Right Mode. When
the
LEFT or RIGHT button
of the VERT MODE switch is
pressed,
only the signal
from
the plug-in
unit in the selected
compartmentis
displayed.
Alternate
Mode. The ALT position
of the VERT MODE
switch produces a display which alternates between the
plug-in
units in the left vertical
and right vertical
compart-
ments
with each sweep
of the CRT. Although the ALT
mode can be used at all sweep rates,
the CHOP mode
provides
a more satisfactory
display at sweepratesbelow
about20 milliseconds/division.
At theseslower
sweeprates,
alternate-modeswitchingbecomes
visually
perceptible.
NOTE
This instrument will not operate in the ALT mode if
the horizontal plug-in unit is not operated in the
time-base
mode.
The TRIG SOURCE switch allows selection
of the
triggering
for an alternatedisplay.When
this
switchisset
to
the VERT MODE position,
eachsweepis
triggeredby the
signalbeing
displayedon the CRT. This provides
a stable
displayof two unrelatedsignals,
but does not indicate
the
timerelationshipbetween
the signals.In
eitherthe LEFT or
RIGHT positions
of the TRIG SOURCE switch, the two
signals
are displayed showing true time relationship.
However,if the signals
are not time-related,the display
from the plug-in
unit which is not
providing
a triggersignal
will appearunstable
on
the CRT.
Chopped Mode. The CHOP position of the VERT
MODE switch produces
a display which is electronically
switched between channels at a one-megahertzrate. In
general,
the CHOP
mode
provides
the
best
display
at
sweep
rateslower than about 20 milliseconds/division,
or when-
everdual-tracesingle-shot
phenomena
areto be displayed.
At faster sweep rates, the chopped switching becomes
apparentand
may interferewith the display.
Correct internal triggeringfor the CHOP mode can be
obtained in any of the three positions of the TR lG
)SOUnCe switch.When the TRIG SOURCE
switch
is
setto
' VERT MODE,
the internal triggersignals
from the vertical
(A
Operating Instructions-7603/R7603 Service
plug-in
units
arealgebraically
added
and the time-base
unit
is
triggeredfrom the resultant
signal.
Useof the LEFT or
RIGHT trigger-source
positions
trigggers
the time-base
unit
on the internal
triggersignal
from the
selected
vertical
unit
only. This allows
two time-related
signals
to be
displayed
showing
true time relationship.
However,
if the signals
are
not time-related,
the displayfrom the channel
which is
not
providing
the
triggersignal
will appear
unstable.The
CHOP
mode can be used
to compare
two single-shot,
transient,
or
random signals
which occur within the time interval
determined
by the time-base
unit (ten
timesselected
sweep
rate). To provide correct triggering,
the display which
provides
the triggersignal
must
precede
the second
display
in time. Since the signalsshow true time relationship,
time-difference measurements can be made from the
display.
Algebraic Addition. The ADD position of the VERT
MODE switchcan
be usedto displaythe
sum
or difference
of two signals,
for common-mode
rejection
to remove
an
undesiredsignal,
or for DC
offset
(applying
a
DC voltage
to
one
channnel
to offsetthe DC component
of a signal
on the
other channel).The common-mode
rejection
ratio between
the vertical
plug-in
compartments
of the 7603 is
greater
than 20:1 at 50 megahertz.The rejection
ratio increases
to
100:'l
at DC.
The overall
deflectionfactor on the CRT in the ADD
mode is
the resultant
of the
algebraicaddition
of the
signals
from the two vertical plug-in units. lt is difficult to
determine
the voltage
amplitude
of the resultant
display
unlessthe amplitude
of the signal
applied
to one of the
plug-in
units is known. This is
particularly
true
when the
vertical
units
aresetto different
deflection
factors,
sinceit
is not
obvious
which
portion
of the
displayis
a resultof the
signal
appliedto either
plug-in
unit.
Also,
the polarity
and
repetition rate of the applied signals
enters into the
calculation.
The following general
precautions
shouldbe
observed
to
provide
the
best
displaywhen
usingthe ADD mode:
1. Do not exceedthe input
voltagerating
of the
plug-in
units.
2. Do not apply largesignals
to the plug-in
inputs.
A
good rule to follow is not to apply a signal
which exceeds
an equivalentof about eight times
the vertical
deflection
factors. For example,
with a vertical
deflection
factor of
0.5 volt/division,the voltage
appliedto that plug-in
unit
should
not exceed 4 volts.
Larger
voltagesmay resultin a
distorteddisplay.
3. To ensure
the greatest dynamic range
in the ADD
mode, set the position
controls
of the plug-in
units to a
1-1
1
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Operating
Instructions-7603/R7603 Service
setting
which would resultin
a mid-screen
displayif
viewed
in the LEFT or RIGHT positions
of the VERT MODE
switch.
4. For similar response
from each channel,
set the
plug-in
unitsfor
thesameinput
coupling.
Trigger
Source
The TRIG SOURCE switch allows
selection
of the
internal trigger signal
for the time-base
unit. For most
applications,
this switch
can be set
to the VERT MODE
position.
This position is the most convenient,
since
the
internal trigger signal is automaticallv
switched
as the
VERT MODE switch is changed,
or as the display
is
electronically
switched
between
the left vertical
and right
vertical
plug-in
units in the ALT position
of the VERT
MODE switch.
lt also
provides
a usable
trigger
signalin
the
ADD or CHOP positions
of theVERT
MODE
switch.
since
the internal
trigger
signal
in these
modes
is
the algebraic
sum of the signals
applied
to the vertical plug-in
units.
Therefore,
the VERT IVIODEposition ensures
that the
time-base
unit receives
a trigger
signal
regardless
of the
VERT MODE switch setting,
without the need
to chanqe
the
trigger
source
selection.
lf correct triggering
for the desired
display is not
obtained
in the VERT MODE position.
the LEFT or
RIGHT positions
can be used
to obtain the trigger
signal
from either
the left vertical
or right vertical plug-in
unit.
The internal
trigger
signal
is obtained
from the selected
vertical compartment,
whether the plug-in unit in that
compartment
is
selected
for display
on the
CRT or not. lf
the internal trigger signal
is obtained from one of the
vertical
units, but the other vertical
unit is selected
for
display,
the internal
trigger
signal
must
be
time-related
to
the displayed
signal
in order
to obtain
a triggered
(stable)
displav.
X-Y
Operation
In some
applications,
it is
desirable
to display
one
signal
versus
another
(X-Y) rather
than against
time (internal
sweep).
The
flexibility
of the
plug-in
units
available
for
use
with the 7603 provides
a means
for applying
an
external
signal
to the horizontal
deflection
system
for this
tvpe of
display.
Some of the 7B-series
time-base
untts
can be
operated
as amplifiers
in addition
to their
normat
use
as
tinre-base
generators.
This
feature
allows
an
external
signal
to provide
the horizontal
deflection
on the
CRT. For
most
of the time-base
units
with the amplifier
function,
the
X
(horizontal)
signal
can be
connected
either
to an
external
Input
connector
on
the time-base
unit
or it can
be
routed
to
the time-base
unit through
the internal
triggerrng
sysrem
(see
time-base
instruction
manual
f
or details)
. lf the latter
method
is
used,
the TRIG SOURCE
switches
must
De
setso
that the X (horizontal)
signal
is
obtained
from one
of the
1-12
vertical
units
and the Y (vertical)
signalis
obtained
from
the other
vertical
unit.
The
advantages
of using
the internal
tngger system to provide the X signal
are that the
attenuator switch of the amplifier unit providing
the
horizontal signal determines the horizontal deflection
factor
to allowfull-range
operation
andthe
plug-in
units
do
not have
to be moved
between
compartments
when X_y
operation
isdesired.
Another method
of obtaining
an X-y display
is
to install
an amplif
ier plug-in
unit in one of the horizontalplug_in
compartments
(check
amplifier unit gain as
given
in the
plug-in
instruction
manual
to obtain calibrated
horizontal
deflection factors).
This method provides
the best
X-y
display,
particularly if two identical
amplifier
units
are
used,
since
both the X and Y input systems
will have
the
same
delay
time, gain
characteristics,
input coupling,
etc.
For further information
on obtaining
X-y displays,
see
the
plug-in
unit manuals.
Also,
the
reference
books
listed
under
Applications
provide information on X-y measurements
and
interpreting
the resultant
lissajous
displays.
Intensity
Modulation
Intensity (Z-axis)
modulation can be used
to relate
a
third item of electrical
phenomena
to the vertical
(y-axis)
and the horizontal
(X-axis)
coordinates
without affectino
the waveshape
of the displayed
signal.
The Z-axis
modul
I
lating signal applied to the CRT circuit changes
the
I
intensity
of the
displayed
waveform
to provide
this
type
of
display.
"Gray scale"
intensity
modulation
can
be
obtained
by applying
signals
which do not completely
blank the
display.
Large
amplitude
signals
of the
correct
polarity
will
completely blank the display; the sharpest
display is
provided
by signals
with a fast rise
and fall. The voltage
amplitude
required
for visible
trace modulation
depends
upon the setting
of the INTENSITY control.
A two_volt
peak-to-peak
signal
will completely
blank
the display
even
at maximum intensity
levels.
Lower
amplitude
signals
can
be used
to only change
the trace
brightness
rather
than
completely
blank the display.
Negative-going
modulating
signals
increase
the display intensity and positive-going
modulating
signals
decrease
the display intensity.
Useful
input
frequency
range
is
DC
to 10
megahertz
(input
voltage
derating
necessary
above
two megahertz).
The maxrmum
input voltage
should
be limited
to 10
volts
(DC
plus
peak
AC).
Time markers applied to the EXT Z AX lS input
connectorprovide
a direct
time reference
on the
display.
With uncalibrated
horizontal
sweep
or external
horizontal
mode operation,
the time markers
provide a means
of
reading
time directly from the display.
However,
if the
markers
are not time-related
to the
displayed
waveform,
a
single-sweep
display should be used
(for internal
sweep
only)
to provide
a stable
display.
@
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Raster
Display
A raster-type
display
canbe usedto effectively increase
the apparentsweeplength.For this type of display,the
trace is deflected both vertically
and horizontally by
sawtooth signals.This is accomplishedin the 7603 by
installing
a 7B-series time-baseunit in oneof the vertical
plug-in
compartments.Normally,
the
time-base
unit in the
vertical
compartmentshouldbe setto a slowersweeprate
thanthe time-baseunit in
thehorizontalcompartment;
the
number
of horizontaltracesin the raster
dependsuponthe
ratio between
the two sliveeprates.Information
can be
displayed
on the rasterusingseveral
different
methods.ln
the
ADD position
of the VERT MODE
switch,
the
signal
from an amplifierunit can be algebraically
added
to the
vertical
deflection.
With this method,
the verticalsignal
amplitudeon the CRT should not exceedthe distance
between
the horizontallines
of the raster.Another
method
of displayinginformation
on the rasteristo usethe EXT
Z
AXIS
input
to provide intensitymodulation
of the
display.
This type of raster
displaycould be usedto provide
a
television-typedisplay.Completeinformation
on operation
using the Z-axis feature is given under Intensity
Modulation.
To provide
a stable rasterdisplay.both
time-base
units
must be correctly triggered.Internal
triggering
is not
provided
for the time-base
units when they are in the
verticalcompartments;
external
triggeringmust be used.
Also, blanking
is not provided
from the time-baseunits
whenthey
are
installed
in
a
vertical
compartment.To blank
out the retrace
portion from the time-base
unit in the
vertical
compartment,
specialconnections
must be made
from this time-base
unit to the blanking
network
of the
7603.
lf this mode
of operationis
desirable,contact
your
local TEKTRONIX Field Office or representative
for
specific information
on obtainingblanking
with thespecific
time-baseunit being
used
in
thevertical
compartment.
Calibrator
General.The internal
calibrator
of the 7603
provides
a
convenientsignalsourcefor checkingbasic
vertical
gain
and
for adjusting
probe
compensation
as
describedin the
probe
instruction
manual.
In
addition,thecalibratorcan
beused
as a convenient signalsourcefor applicationto external
equipment.
Voltage.The
calibrator
provides
accurateoutputvoltage
of 40 millivolts,0.4 volt, and 4 volts at the three
front-panel
pin-jack
connectors
into
high-impedanceloads.
Output resistanceis
approximately50 ohms
at
the 40 mV
and
0.4
V pin
jacks
and
approximately
450
ohmsat the
4 V
pin
jack.
Current.A 40-milliampere,
one-kilohertzoutputcurrent
is provided
when the optional current-loop
accessory
tA)
Operating
Instructions-7603/R7603
Service
(TE
KTRONlX Part No. 012-0259-00)
is connected
between
the 4 V pin-jack
and
ground.
This
output
can
be
used to check and calibrate
current-measuring
probe
systems.
Waveshape.
The square-waveoutput signal
of the cali-
brator
canbe used
asa
reference
waveshape
whenchecking
or adjustingthe compensation
of passive, high-resistance
probes.
Since
the square-waveoutput from the calibrator
hasa flat top, anydistortionin the displayed
waveform
is
due
to the
probe
compensation.
DC voltage
output is
also
availableby changing
a
jumper
on the calibrator
board;see
Fis.
1-5.
Fig. 1-5. Jumper locations for DC and one-kilohertz Calibrator
operation (Calibrator board).
SignalsOut
Vertical
Signal.
The
VERT
SIGOUT
connector
provides
a sample
of the verticaldeflection
signal.The
source
of
the
outputsignalis
determinedby theTRIG
SOURCE
switch.
The source
will follow the
settingof theTRIG
SOURCE
switch.Whenthe TRIG
SOURCEis in
theVERT MODE
the output will follow the VERTICAL MODE
switch
exceptCHOP.then
the signals
are
ADDED.
The
output
signals
are LEFT, ALT, ADD and RIGHT.The output
signal
into
50 ohms
is
about25 millivolts/division
of the
verticalsignal
displayedon systems
CRT.The
outputsignal
into 1 megohmis
about
0.5 volts/division
of the vertical
signal
displayedon thesystems
CRT.
+ Gate.The + gate
connector
provides
a sweep
gate
signalthat is
generated
by the time base
plug-in
unit. The
hele for one-
kiloherle outpul
1-13
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Operating Instructions-7603/R7603 Service
gate selector switch provides three gates MAIN,
AUXILIARY and DELAY. The
duration
of the
gatepulse
is
determinedby the respective
sweep.Auxiliary
and Delay
gates
can
only be
produced
by dual
sweep
time
base
plug-in
units.The
amplitude
of the
gate
signal
is
about50
millivolts
into
50 ohms
or 10 volts into 1 meoohm.
+ Sawtooth. The + sawtooth connector provides a
positive
going
sample
of the sawtooth from the time base
unit in the horizontalcomoartment.The rate
of rise of the
sawtooth
signal
is
about 50 millivolts/unit
of time into 50
ohms or '1 volt/unit of time
into 1 megohm.
Unit of time is
determined by the time/division switch of the horizonal
plug-in
unit.
Applications
The 7603 Oscilloscopeand its associated plug-in
units
provide a very f
lexible measurement
system.The capa-
bilities
of the overallsystemdepend mainly upon the
plug-in
units that arechosenfor usewith this instrument.
Specific
applicationsfor the individual
plug-in
units
are
describedin the plug-in manuals.The overallsystemcan
alsobe usedfor many applicationswhich
are
not described
in detail eitherin this manual
or in the manualsfor the
individual
plug-in
units.Contact
your localTEKTRON
lX
Field Office or representativefor assistancein making
specif
ic
measurementswith this instrument.
The following booksdescribe
oscilloscopemeasurement
techniques which can be adapted for use with this
instrument.
John
D. Lenk,
"Handbook
of Oscilloscopes,Theory,
and
Application",
Prentice-HallInc., Englewood
Cliffs,New
Jersev.i968.
J. Czech, "Oscilloscope Measuring Techniques",
Springer-Verlag,New
York,
1965.
J. F. Golding,
"Measuring
Oscilloscopes",
Transatlantic
Arts,
Inc.,
1971.
Charles
H. Roth Jr.. "Use
Programmed
text, Prentice-Hall
New
Jersev,
1970.
of the Oscilloscope",
A
Inc., Englewood
Cliffs,
Repackaging
for
Shipment
lf the Tektronix instrument
is
to beshipped
to a Tektronix
ServiceCenterfor service
or repair,
attach
a tag showing:
owner (with
address)
and
the
name
of an individual
at
Vour
firm that can be contacted,
complete
instrument
serial
number
anda
description
of the servicerequired
Save
and
re-use
the package in which
your instrument
was
shipped.
lf the original
packaging
is unfit for use
or not
available,repackage
the
instrument
as
follows:
Surround the instrument
with polyethylene
sheeting
to
protect
the
f
inish
of the instrument.
Obtain
a
carton
of
corrugated
cardboard
of the correctcarton
strength
and
having
inside
dimensionsof no less
thansixinchesmore
thanthe
instrument
dimensions.
Cushiontheinstrument
by tightly packing
three inches
of dunnage
or urethane
foam betweencarton and
instrument,
on all sides.Seal
cartonwith shippingtapeor industrial
stapler.
The cartonteststrengthfor
your instrument
is375
pounds.
(
1-14 REV,B-NOV.
1976
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