Tektronix 7603 User manual

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REV . B, JUNE, 1976
TABLE OF
CONTENTS
7603/R7603 Service
Page Page
SECTION 1
OPERATING INSTRUCTIONS
SECTION
4 CIRCUIT
DESCRIPTION
Preliminary Information
1-1
Block Diagram
4-1
Display
Definitions
1-2
Circuit Operation
4-1
Plug-in
Units 1-3
Logic Fundementals
4-3
Controls
and Connectors
1-3
Main Interface
4-6
Operating
Checkout
1-3 Logic
Circuit
4-6
Simplified Operating Instructions
1-7 Trigger
Selector
4-16
General
Operating Information
1-9 Vertical
Interface
4-19
Vertical
Amplifier 4-20
SECTION 2
SPECIFICATION
Horizontal
Amplifier 4-21
Vertical
Deflection System 2-1
Calibrator and Front
Panel
Triggering 2-2
Switching
4-23
Horizontal Deflection System 2-2
CRT Circuit
4-24
Calibrator
2-3
Low-Voltage
Power Supply 4-27
External Z
Axis Input 2-3
Signal
Out Board
4-31
Outputs
2-3
Readout
System
4-31
Character Generator 2-4
SECTION 5
MAINTENANCE
Display (CRT) and Options
2-4
Power Source
2-5
Preventive
Maintenance 5-1
Signals Out
2-5 Troubleshooting 5-2
Environmental
2-6 Location of Circuit Boards
5-4,5-5
Physical
2-6 Electrode Configuration
for
Standard Accessories
2-6 Semiconductors
5-7
7600-Series System
Specifications 2-7 Corrective
Maintenance 5-10
SECTION 3 CALIBRATION
SECTION 6 RACKMOUNTING
Test Equipment Required
3-1
Instrument Dimensions
6-1
Calibration Procedure
3-4 Rack
Dimensions
6-1
Power Supply
3-5 Slide-Out
Tracks
6-1
Display and Z-Axis
3-6
Mounting Procedure
6-1
Vertical Deflection System 3-9
Triggering System 3-12
SECTION 7
ELECTRICAL PARTS LIST
Horizontal Deflection System 3-13
SECTION8 DIAGRAMS and
CIRCUIT BOARD
Z-Axis and Auto Focus System 3-15
ILLUSTRATIONS
Calibrator 3-16
Signals Out 3-17
SECTION 9 MECHANICAL
PARTS LIST
Readout Operation 3-18
Readout Gate Trig'd Operation 3-18
CHANGE INFORMATION

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 . Thetwo 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 used for many measurement applications . In addition, the instrument contains a
readout system to provide a CRT display of alphanumeric information from the plug-in units . Data such as
deflection 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 170 watts (60 hertz, 115-volt line) .
7603/137603

General
OPERATING
INSTRUCTIONS
To
effectively use the 7603, the operation and
capabilities of the instrument must be known . This section
describes the operation of the front- and rear-panel controls
and connectors and gives simplified and general
operating
information .
PRELIMINARY
INFORMATION
OperatingVoltage
WARNING
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 . It is not intended for operation from two
phases of a multi-phase system, or across the legs of a
single-phase, three-wire system .
The7603 can be
operated from either a 110-volt or a
220-volt
nominal line-voltage source . In addition, three
operating
ranges can be selected within each nominal line
voltage source
. The voltage-selector jumper on the Rectifier
board
(see Fig . 1-1) allows selection of the operating
voltage . To convert the instrument from one
regulating
range to another, first disconnect the instrument
from the
power source . Then, slide out the power unit as
described
in the Maintenance section . Remove the voltage-selector
jumper and re-install it on the set of pins
which represent
the desired regulating range . Select a
range which is
centered about the average line voltage to
which the
instrument is to be connected (see
Table 1-1) .
TABLE 1-1
Regulating Range and Fuse Data
To convert from 110-volts to 220-volts
nominal line
voltage, or vice versa, remove the voltage-selector
jumper
and replace it with the spare jumper
(stored on pins
adjacent to voltage selector area) . The
jumpers are color-
REV . C, NOV . 197 6
Section 1-7603/R7603 Service
Fig . 1-1 . Locations of voltage-selector
jumper, spare jumper, and
ALT FUSE in power
unit (7603 shown) .
coded to indicate the
nominal voltage for which they are
intended ; brown for 110-volt
nominal operation and red for
220-volt nominal operation
. Change the line fuse to provide
protection for the
selected nominal line voltage . Use the
fuse located
in the ALT FUSE holder on the Rectifier
board (see
Fig . 1-1) or see Table 1-1 for value . Also,
change
the
line-cord plug to match the power-source
receptacle or
use a suitable adapter .
Power Cord
Conducto r Ident ification
The 7603 is designed to be used with a
three-wire AC
power system . If a three- to two-wire
adapter is used to
connect this instrument to a two-wire
AC power system, be
sure to connect the ground lead
of the adapter to earth
(ground)
.
Failure to
complete the ground system may allow
the chassis of this instrument to
be elevated above ground
potential and pose a shock hazard .
Operating
Temperature
The 7603 can be
operated where the ambient air
temperature is
between O'C and +50 ° C . This instrument
Conductor Color
Alternate Color
Ungrounded (Line)
Brown Black
Grounded (Neutral)
Blue White
Grounding
(Earthing) Green-Yellow Green-Yellow
Pins Regulating Range
Selected
110-volts nominal 220-volts nominal
LOW
90
to
110 volts 180 to 220 volts
MED
99 to 121 volts 198 to 242 volts
HI
108 to 132 volts 218 to 262 volts
Line Fuse 3 .2 A slow-blow 1 .6 A slow-blow

Operating
Instructions-7603/R7603 Service
can be stored in ambient temperatures between -55 ° C and
+75 ° C . After storage at temperatures beyond the operating
limits, allow the chassis temperature to come
within the
operating limits before power
is applied .
The 7603 is cooled by convection air flow through the
instrument . Components which require the most cooling
are mounted externally on a heat radiator at the rear
.
Adequate clearance must be provided on
all sides
to
allow
heat to be dissipated from the instrument . Do
not block
or
restrict the air flow through the holes
in the cabinet or the
heat radiator on the rear
. Maintain the clearance provided
by 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 holes on
the right side . Adequate
clearance must be provided at
these
locations . Allow at least one and one-half inches
clearance behind the air filter and at least one inch on the
right
side .
A
thermal cutout
in this instrument provides thermal
protection and
interrupts the power to the instrument if
the internal temperature
exceeds
a
safe operating level .
Power is automatically
restored when the temperature
returns to a safe level
. Operation in confined areas or in
close
proximity to heat-producing instruments may cause
the thermal cutout to open more frequently .
Operating Position
A bale-type stand is mounted on the bottom of
this
instrument . This stand permits the 7603 to be
tilted up
about 10 ° for more convenient
viewing .
Rackmounting
Instructions and dimensional drawings for rackmounting
the R7603 are located in Section 6 of the service manual .
General
DISPLAY DEFINITIONS
The following definitions describe the types of displays
which can be obtained with a 7603 Oscilloscope system
with real-time amplifiers, time-base units, or combinations
of these . Use of special purpose plug-in units may result in
different types of displays, which are defined in the
instruction manuals for these special units . The following
terminology will be used throughout this manual .
Alternate Mode
A time-sharing method of displaying two or more signals
with a single cathode-ray tube beam . Channel switching is
sequential and occurs at the end of each sweep .
Chopped Mode
A time-sharing method of displaying
two or more signals
with a single
cathode-ray tube beam . Channel switching is
sequential and
occurs at a rate determined by an internal
clock generator
(chopping rate) .
NOTE
See Simplified Operating
Instructions in this section
for set-up
information to obtain each of the following
displays .
Single Trace
A display of a single plot produced by one vertical signal
andone sweep .
Dual Trace
A display of two plots produced by two vertical signals
and one sweep .
Delayed Sweep - Single Trace
A display of a single plot produced by one vertical signal
and a delayed sweep . Two sweeps are used to produce this
display ; the sweeps are operating with a delaying/delayed
relationship where one sweep (identified as the delaying
sweep) delays the start of the second sweep (identified as
the delayed sweep) .
Delayed Sweep - Dual Trace
A display of two plots produced by
combining two
vertical signals and a delayed sweep . Two sweeps
are used
to produce this display ; the
sweeps
are operating
with a
delaying/delayed
relationship . Each vertical signal is
displayed against the delayed
sweep .
X-Y
A plot of two variables, neither of which represents time .
X refers to the horizontal axis and Y refers to the vertical
axis .

General
Plug-In Installation
REV . B, MAR . 1975
PLUG-IN UNITS
The 7603 is designed to accept up to
three TEKTRONIX
7-series plug-in units . This plug-in
feature allows a variety of
display combinations and
also allows selection of band-
width, sensitivity,
display mode, etc . t o meet the measure-
ment
requirements . In addition, it allows the oscilloscope
system to be expanded to meet future measurement
requirements . The overall capabilities of the resultant
system are in large part determined by the characteristics of
the plug-in selected . For complete information on plug-ins
available for use with this instrument, see the
current
Tektronix, Inc . catalog .
To install a plug-in unit
into one of the plug-in
compartments, align the
slots in the top and bottom of the
plug-in with the
associated guide rails in the plug-in
compartment .
Push the plug-in unit firmly into the
plug-in
compartment
until it locks into place . To remove a plug-in,
pull the release
latch on the plug-in unit to disengage it
and
pull the unit
out of the plug-in compartment .
Plug-in units
can be
removed or installed without
turning off the
instrument
power .
It is not necessary that
all of the plug-in compartments
be filled to operate the
instrument ; the only plug-in units
needed are those required
for the measurement to be made .
However, at
environmental extremes, excess radiation may
be radiated into or
out of this instrument through the open
plug-in compartments .
Blank plug-in panels are available
from Tektronix,
Inc . t o cover the unused compartment ;
order
TEKTRONIX Part No . 016-0155-00 .
When the 7603
is calibrated in accordance with the
calibration
procedure given in this instruction
manual, the
vertical and
horizontal gain are standardized . This
allows
calibrated plug-in
units to be changed from one
plug-in
compartment to
another without recalibration
. However,
the basic calibration of the individual
plug-in units should
be checked when they are
installed in this system to verify
their measurement
accuracy . See the operating instructions
section of
the plug-in unit instruction manual for
verifi-
cation
procedure .
Special
purpose plug-in units may have specific restric-
tions regarding the plug-in compartments in which they can
be installed . This information will be given in the instruc-
tion
manual
for these plug-in units .
NOTE
Laterproduction of
rackmount oscilloscopes are pro-
vided with
support posts between the individual plug-
in compartments .
A post or posts must be removed if
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 .
The major
controls for operation of the 7603 are located
on the front panel of the instrument .
Figs .
1-2 and
1-3
provide a brief description of each control and connector .
More detailed operating information
is given under General
Operating Information .
General
CONTROLS
AND
CONNECTORS
The following Operating Checkout provides a means of
verifying instrument operation and basic calibration with-
out removing
the covers or 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
operation of this instrument . If re-calibration of the 7603
appears to be necessary, see the Calibration procedure in
Section 5 of this manual . If re-calibration of a plug-in unit
is indicated, see the instruction manual for the appropriate
plug-in unit .
Set-Up Information
Operating Instructions-7603/R7603
Service
OPERATING CHECKOUT
1 . Set the front-panel
controls as follows :
INTENSITY Counterclockwise
FOCUS

Midrange
BEAM FINDER

Pressed
in
GRATICULE ILLUM

As desired
VERT MODE

LEFT
TRIG SOURCE

VERT MODE
POWER

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
range
marked on the rear panel (see Operating Voltage
in
this
section for information on converting this
instrument
from
one operating voltage to another)
.
3 . Install TEKTRONIX 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 several minutes warmup before proceeding .
5 . Set both vertical units
for
a
deflection factor of two
volts/division and center the vertical position controls
. Set
both vertical units for AC input
coupling .
6 . Set the time-base unit for a sweep
rate of one
millisecond/division in the auto,
internal trigger mode .

Operating
Instructions-7603/R7603 Service
FUNCTIONS
OF CONTROLS
AND CONNECTORS
Front Panel
7
. POWER-
Switch : Controls
power to the instrument
.
1 . INTENSITY-Controls
brightness of
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 source of internal
trigger signal
for
the time base plug-in
in the horizontal
compartment .
LEFT : The
trigger signal is obtained
from the plug-in unit
in
the left vertical
compartment only .
VERT MODE
: Trigger signal
automatically 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 trigger
signal is obtained from the
plug-in unit in
the
right vertical compartment
only .
Fig . 1-2 .
Front-panel controls
and connectors .
Light : Indicates that
the power switch is on and that
the
instrument is connected
to a line voltage source .
8 .
CALIBRATOR-Calibrator output pin jacks
(4 V, 0 .4 V, 40
mV, ground) .
Positive-going 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
are displayed .
ALT : Signals from
plug-in units in both the left
and right
vertical compartments
are displayed (dual trace) .
Display
switched between
vertical plug-in units after each sweep .
ADD : Signals
from plug-in units in both the
left and right
vertical compartments
are algebraically added and
the sum is
displayed on the
CRT .
CHOP : Signals
from plug-in units in both the
left and right
vertical
compartments are displayed (dual trace) .
The display is
switched
between vertical plug-in units at
approximately one
megahertz rate .
RIGHT : Signals from plug-in
unit in right vertical compart-
ment is
displayed .
10 .
Camera Power (Not Labeled)
-Three-pin connector on CRT
bezel provides power output (+15 V) .
Receives remote single sweep
reset signal from compatible
camera systems, and a ground pin
connection .

Rear Panel
1 .
FUSE-Line voltage fuse for
instrument .
2 .

S S
READY OUT-Provides
an external single
sweep ready
indicator
signal after the single
sweep has been reset .
3 .
EXT S S RESET
IN-Remote single sweep
reset .
4 .
EXT Z AXIS IN-Input
connector for intensity
modulation of
the
CRT display .
5 .
VERT SIG
OUT-Vertical signal selected by
TRIG SOURCE
switch (LEFT, RIGHT,
ALT and ADD) .
6 . GATE
OUT-Gate signal
selected by gate
selector switch
(MAIN,
AUXILIARY, and DELAY) .
7 . + SAWTOOTH
OUT-Positive-going sawtooth
from time-base
unit .
Fig . 1- 3 . Rear-panel
controls and
connectors .
Operating Instructions-7603/137603
Service

Operating Instructions-7603/R7603 Service
7 . Advance the INTENSITY control
until the trace is 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 . Adjust the FOCUS control for a
sharp, well-defined
display over the entire trace length . If a properly
focused
display cannot be obtained with the FOCUS
control, the
internal Astigmatism adjustment must be
re-set ; see the
Calibration section of this
manual .
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 . If the trace
is not parallel to
the center horizontal line of the graticule,
see Trace
Rotation adjustment procedure in Calibration
section .
Graticule Illumination
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 filter installed) . Set the control so
the graticule
lines are illuminated as desired .
Vertical Deflection System
12 . Connect the 4V

calibrator signal to the
input
connector of the left vertical unit with the
BNC to pin-jack
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 only the left
vertical unit has an effect on the position of the display .
Position the display to 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 .
15 . A correct display in both steps 12 and 14 indicates
that the 7603 Vertical Deflection System and the vertical
plug-in units are
calibrated . If 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
adjustment
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 by
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
all
sweep
rates .
18 . Press the CHOP button of the VERT
MODE switch .
Turn the sweep rate throughout
its range . Notice that a
dual-trace display is presented at
all sweep rates, but unlike
ALT both vertical units
are
displayed on each
sweep in a
time-sharing manner . Return the
sweep rate to 0 .5
millisecond/division .
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 CRT with the left vertical
unit position control . Disconnect the input signal from the
right vertical unit input connector . Sequentially press all of
the VERT MODE switch buttons . Notice that a stable
display is obtained in all positions of the VERT MODE
switch (straight line in 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 . Sequentially press 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 signal connected
O

to the right
vertical unit . Return the TRIG
SOURCE switch
to
VERT MODE . Remove calibrator signal
from left
vertical
unit and connect it to right
vertical unit . Repeat
steps 20 to 22 . The trigger
signal will come from right
vertical . When the
LEFT button is pressed of the
TRIG
SOURCE switch
the display is not stable
because there is
no input
signal connected to the left
vertical . Return the
TRIG
SOURCE switch to VERT MODE .
Horizontal Deflection
System
23 . Position
the start of the sweep to the left
graticule
line with the time-base
unit 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/division and set the VERT
MODE switch
to RIGHT
. Set the time-base unit for a sweep
rate of five
milliseconds/division .
25 . Connect the probe
tip
to a
line-voltage source . The
display should show three complete
cycles over the 10
divisions within 0 .3 division . A
correct display indicates
that
the 7603 Horizontal
Deflection System and the
time-base plug-in unit are correctly
calibrated . If 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 manual for
adjustment procedure .
26 . Disconnect
the probe from the line-voltage
source
and the right
vertical unit . Set the VERT MODE
switch to
LEFT and
set the time-base unit for a sweep rate of
0 .5
millisecond/division
.
Beam
Finder
27 . Set the deflection factor of the
left vertical unit to
0 .1 volt/division . Notice that a
square-wave display is not
visible,
since the deflection exceeds the
scan area of the
CRT .
28 . Press and
hold the BEAM FINDEF~ . switch . Notice
that the display is
returned to the viewing area
in
compressed form .
Increase the vertical and horizontal
deflection factors
until the display is reduced to
about two
divisions vertically and horizontally
(when the horizontal
unit is operated in the time-base
mode, change only the
NOTE
This step is based on an
accurate 60-Hertz line
frequency . For
other line frequencies, this procedure
will need to be changed
accordingly .
Operating Instructions-7603/R7603
Service
deflection factor of
the vertical unit) . Adjust the
position
controls of
the displayed vertical unit and
the time-base
unit to center the compressed
display about the center lines
of the graticule . Release the
BEAM FINDER switch . Notice
that the display remains within
the viewing area .
Z-Axis
Input
29 .
If
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
signal to both the input of the
right vertical unit
and the
EXT Z AXIS connectorwith two
BNC cables and a
BNC
T connector . Set the VERT
MODE switch to RIGHT
and set
the vertical unit for a
deflection factor of two
volts/division . Set the time-base unit
for a sweep rate which
displays several cycles of the signal . Adjust
the amplitude of
the
signal generator until intensity
modulation is visible on
the display . The positive peaks of the
waveform should be
blanked out and the negative
peaks intensified . Notice that
the setting of the
INTENSITY control determines the
amount of intensity
modulation that is visible .
30 . Disconnect the signal from the EXT Z
AXIS
connector, but leave it 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
operations not explained here, or
operations which need
further explanation are discussed
under General Operating
Information .
SIMPLIFIED OPERATING INSTRUCTIONS
The following information is provided to aid
in quickly
obtaining the correct
setting for the 7603 controls to
present a
display . The operator should be 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
units .
Single-Trace
Display
The following procedure will provide a display of a
single-trace vertical unit against one time-base unit . For
simplicity of explanation, the vertical unit is installed in the
left vertical
compartment . The right vertical compartment
can be used if the procedure is changed accordingly .
1 . Install a 7A-series vertical unit in the left vertical
compartment .

Operating
Instructions-7603/R7603 Service
2 . Press the LEFT button of the VERT MODE switch .
3 . Install a 7B-series time-base unit in the horizontal
compartment .
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
calibrated deflection factors .
7 . Set the time-base unit for auto mode, internal
triggering at a calibrated sweep rate of one millisecond/
division .
8 . Advance the
INTENSITY control until
a
display is
visible . (If no display is visible 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 the FOCUS control for
a well-defined display . Adjust Readout INTENSITY for the
desired viewing level .
9 .
Set the vertical deflection factor and vertical position
control for a display which remains within the graticule
area
vertically .
10
.
If
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 desired number of cycles .
Dual-Trace Display
The following procedure will provide a display of two
single-trace vertical units against one time-base unit .
1 . Install 7A-series vertical units in both vertical plug-in
compartments .
2 . Press the
LEFT
button of the
VERT MODE switch .
3 . Install a
7B-series time-base unit in the horizontal
compartment .
4 .
Press the
VERT MODE button of the TRIG 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 . (If no display is visible with INTENSITY at
midrange, press and hold 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 display to the top of the
graticule area .
10 . Press
the
RIGHT button of the VERT MODE
switch .
11 . Set the RIGHT vertical unit deflection factor for a
display about four divisions in 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 display 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, see Vertical Mode in this section .)
13 . If necessary, adjust the time-base triggering controls
for a stable display .
14 . Adjust the time-base position control so the display
begins at the left edge of the graticule . Set the time-base
sweep rate for the desired horizontal display
.

Delayed Sweep - Single Trace
The 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 sure the time-base
unit installed in the horizontal
compartment is a dual
time-base with delaying/delayed
capabilities .
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 .
2 . Be sure the time-base unit installed
in
the
horizontal
compartment is a dual time-base unit with delaying/delayed
capabilities .
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 signal versus another rather than against time) .
1 . Install 7A-series amplifier units in both the left
vertical and the horizontal compartments .
NOTE
Some 7B-series time-base units have provisions for
amplifier operation in the X-Y mode ; see X-Y
operation in this section for details of operation in
this manner .
2 .
Press the
LEFT button of the VERT MODE switch .
Operating Instructions-7603/137603
Service
3 . Connect the X-signal to
the amplifier unit in the
horizontal compartment
.
4 . Connect the
Y-signal to the amplifier unit in the left
vertical
compartment .
5 . Set both amplifier units for AC input coupling and
calibrated deflection factors .
6 . Advance the
INTENSITY control until a display is
visible . (If no display
is visible, press and hold BEAM
FINDER switch and adjust
the deflection 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
Intensity Control
The setting of the
INTENSITY control may affect the
correct focus of the display . Slight re-adjustment 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 by
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 incorporates protection
circuitry which automatically reduces the display intensity
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 necessary as the
display conditions change . If a properly focused
display
cannot be obtained with the FOCUS control, the
internal
Astigmatism adjustment must be re-set ; see the Calibration
section of this manual .

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
are calibrated to the graticule so
accurate measurements
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 oscilloscopes . One graticule
has 0% and
100% 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 . In your
manual, illustrations
of the crt face or risetime
measurement instructions
may not correspond with
the graticule markingson
your oscilloscope .
Fig . 1-4 shows the
graticule of the 7603 and defines the
various measurement
lines . The terminology defined here
will be used in all
discussions involving graticule
measure-
ments . Notice
the 0%, 10%, 90% and 100%
markings on the
left side of the
graticule . These markings
are provided to
facilitate risetime measurements .
Light Filter
The tinted filter
provided with the 7603 minimizes
light
reflections from the face of
the CRT to improve contrast
when viewing the display
under high ambient light condi-
tions . This filter should
be removed for waveform photo-
graphs or when
viewing high writing rate displays .
To
remove the filter,
loosen the two screws on the right side of
First

Center Ninth
vertical vertical vertical
line

line

line
Center
horizontal
line
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 . It
also serves
as a light filter to make the
trace more visible
under
high ambient light conditions
. The mesh filter fits in
place of the plastic CRT
mask and the tinted filter . The
filter can be ordered
by TEKTRONIX Part No .
378-0603-00 .
Beam Finder
The BEAM
FINDER switch provides a means
of locating
a display which
overscans the viewing area
either vertically
or horizontally
. When the BEAM FINDER
switch is 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
overscanned
display, use the
following procedure :
1 .
Press and hold the 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 and horizontal position controls to
center the
display about the vertical and
horizontal center
lines of the
graticule .
4 . Release the BEAM FINDER
switch ; the display
should remainwithinthe
viewing area .
Readout Modes
The characters
of the readout display are written by
the
CRT beam
on a time-share basis with 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 operate in
a GATE TR IG'D mode . No
readout signal is produced until
after the sweep has occurred .
In this mode the sweep must
run to have the readout
displayed .
Display Photography
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
applies to
the 7603 .
REV . B, JAN . 1976
00
a .
. .. . . . .
.
. . . . . .
1

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
compatible camera systems . It also receives control signals
from TEKTRONIX automatic cameras to allow camera-
controlled single-shot photography (see camera manual for
further information) .
Vertical Mode
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 compartment is 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 sweep rates below
about 20 milliseconds/division . At these slower sweep rates,
alternate-mode switching becomes 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
alternate display . When this switch is set to
the VERT MODE position, each sweep is triggered by the
signal being displayed on the CRT . This provides a stable
display of two unrelated signals, but does not indicate the
time relationship between the signals . In either the 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 trigger signal
will appear unstable 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-megahertz
rate . In
general, the CHOP mode provides the best
display at sweep
rates lower than about 20
milliseconds/division, or when-
ever dual-trace single-shot
phenomena are to be displayed .
At faster sweep rates,
the chopped switching becomes
apparent and may interfere with
the
display .
Correct internal triggering
for the CHOP mode can be
obtained in any of the
three positions of the TRIG
SOURCE switch . When the
TRIG SOURCE switch is set to
VERT MODE, the internal trigger
signals from the vertical
Operating I nstructions-7603/R7603 Service
plug-in units are algebraically added and the time-base unit
is triggered from the resultant signal . Use of the LEFT or
RIGHT trigger-source positions trigggers the time-base
unit
on the internal trigger signal 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 display from the
channel which is not
providing the
trigger signal 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 times selected sweep
rate) . To provide correct
triggering,
the display
which
provides the
trigger signal must precede the second display
in time . Since the signals show true time relationship,
time-difference measurements can be made from the
display .
Algebraic
Addition . The ADD position
of
the VERT
MODE switch can be used to display
the
sum or difference
of two signals, for
common-mode rejection
to
remove an
undesired
signal,
or
for DC offset (applying a DC voltage to
one channnel to
offset the 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 :1 at DC .
The overall deflection factor on the CRT in the ADD
mode is the resultant of the algebraic addition of the signals
from
the two vertical plug-in units . It is difficult to
determine
the voltage amplitude of the resultant display
unless the amplitude of the signal applied to one of the
plug-in units is known . This is particularly true when the
vertical units are set to different deflection factors, since it
is not obvious which portion of the display is a result of the
signal applied to either plug-in unit . Also, the polarity and
repetition rate of the applied signals enters into the
calculation .
The following general precautions should be observed to
provide the best display when using the ADD mode :
1 . Do not exceed the input voltage rating of the plug-in
units .
2 . Do not apply large
signals
to
the plug-in inputs . A
good rule to follow is not to apply
a signal which exceeds
an
equivalent of about eight times the vertical deflection
factors . For example, with a vertical deflection factor of
0 .5 volt/division, the voltage applied to that plug-in unit
should not exceed 4 volts . Larger voltages may result
in
a
distorted display .
3 . To ensure the greatest dynamic range in the ADD
mode, set the position controls of the plug-in units to a

Operating Instructions-7603/R7603 Service
setting which would result in a mid-screen display
if viewed
in the LEFT or RIGHT
positions
of
the VERT MODE
switch .
4 . For similar response
from each channel, set the
plug-in units for
the same input 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 automatically 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 . It also provides a usable
trigger signal in the
ADD
or
CHOP positions of the VERT 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 MODE position ensures that the
time-base unit receives a trigger signal regardless of the
VERT MODE switch setting, without the need to change
the trigger source selection .
If 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 . If
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)
display .
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 type of
display . Some of the 7B-series time-base units can be
operated as amplifiers in addition to their normal use as
time-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 triggering system
(see time-base instruction manual
for details) . If the latter
method is used, the TRIG SOURCE
switches must be set so
that the X (horizontal) signal
is obtained from one of the
1-
1 2
vertical units and the Y (vertical) signal is obtained from
the other vertical unit . The advantages of using the internal
trigger 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 allow full-range operation and the plug-in units do
not have to be moved between compartments when X-Y
operation is desired .
Another method of obtaining an X-Y display is to install
an amplifier plug-in unit in one of the horizontal plug-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 affecting
the waveshape of the displayed
signal .
The Z-axis modu-
lating signal applied to the CRT circuit changes the
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 maximum
input voltage should be limited to 10 volts (DC plus peak
AC) .
Time markers applied to the EXT Z AXIS input
connector
provide 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 .

Raster Display
A raster-type display can be used to effectively increase
the apparent sweep length . For this type of display, the
trace is deflected both vertically and horizontally
by
sawtooth signals . This is accomplished
in the 7603 by
installing a 7B-series time-base
unit in one of the vertical
plug-in compartments .
Normally, the time-base unit in the
vertical compartment should
be set
to a
slower sweep rate
than the time-base unit
in the horizontal compartment ; the
number
of
horizontal traces in the raster depends upon the
ratio between the two sweep rates . Information can be
displayed on the raster using several different methods .
In
the ADD position of the VERT MODE switch, the signal
from an amplifier unit can be algebraically added to the
vertical deflection . With this method, the vertical signal
amplitude on the CRT should not exceed the distance
between the horizontal lines of the raster . Another method
of displaying information on the raster is to use the
EXT
Z
AXIS input to provide intensity modulation of the display .
This type of raster display could be used to provide a
television-type display . Complete information on operation
using the Z-axis feature is given under Intensity
Modulation .
To provide a stable raster display, both time-base units
must be correctly triggered . Internal
triggering is not
provided for the
time-base units when they are in the
vertical
compartments ; external triggering must be used .
Also, blanking is not provided from the time-base units
when they are installed in a vertical compartment . To blank
out the retrace portion from the time-base unit in the
vertical compartment, special connections must be
made
from this time-base unit to the
blanking network of the
7603 . If this mode of
operation is desirable, contact your
local
TEKTRONIX Field Office or representative for
specific information on obtaining blanking with the specific
time-base unit being used in the vertical compartment .
Calibrator
General . The internal calibrator of
the 7603 provides a
convenient signal source for checking
basic vertical gain and
for adjusting probe compensation as
described in the probe
instruction manual
. In addition, the calibrator can be used
as a convenient
signal source for application to external
equipment .
Voltage . The calibrator provides accurate output
voltage
of 40 millivolts, 0 .4 volt, and
4
volts at
the three
front-panel pin-jack connectors into
high-impedance loads .
Output resistance is approximately 50 ohms at
the 40 mV
and 0 .4 V pin jacks and approximately 450
ohms
at
the 4 V
pin jack .
Current . A 40-milliampere,
one-kilohertz output current
is provided when the optional
current-loop accessory
(TEKTRONIX
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-wave output signal of the cali-
brator can be used
as a reference waveshape when checking
or adjusting
the compensation of passive, high-resistance
probes . Since the square-wave output from the calibrator
has a flat top, any distortion in the displayed waveform
is
due to the probe
compensation . DC voltage output is also
available by changing
a jumper on the calibrator board ; see
Fig . 1-5 .
Fig . 1-5 . Jumper locations for DC and one-kilohertz Calibrator
operation (Calibrator board) .
Signals Out
Operating
Instructions-7603/R7603 Service
Vertical Signal . The VERT SIG OUT connector provides
a
sample of the vertical deflection signal . The source of the
output signal is determined by the TRIG SOURCE switch
.
The source will follow the setting of the TRIG SOURCE
switch . When the TRIG SOURCE is in the VERT
MODE
the output will follow the VERTICAL
MODE switch
except CHOP, then the signals are ADDED .
The output
signals are LEFT, ALT, ADD and
RIGHT . The output
signal into 50 ohms is about 25
millivolts/division of the
vertical signal displayed on systems CRT
.
The output
signal
into 1 megohm is about 0 .5 volts/division of the
vertical
signal displayed on the systems CRT
.
+
Gate . The + gate connector provides
a sweep gate
signal that is generated by the time base
plug-in unit . The
1- 1 3

Operating Instructions-7603/R7603 Service
gate selector switch provides three gates
MAIN,
AUXILIARY and DELAY . The duration of the gate
pulse
is determined by 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 about 50 millivolts
into 50 ohms or 10
volts into 1 megohm .
+ Sawtooth . The + sawtooth connector
provides a
positive going sample of the sawtooth
from the time base
unit in the horizontal
compartment . 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 Oscilloscope and its associated plug-in
units
provide a very flexible measurement
system . The capa-
bilities of the overall
system depend mainly upon the
plug-in units that
are chosen for use with this instrument .
Specific applications
for the individual plug-in units are
described in the plug-in manuals . The overall system can
also be
used for many applications which are not described
in detail either in this manual or in the manuals
for the
individual plug-in units . Contact your local
TEKTRONIX
Field Office or representative for assistance
in making
specific measurements
with this instrument .
The following books
describe oscilloscope measurement
techniques which can be adapted
for use with this
instrument .
John D .
Lenk, "Handbook of Oscilloscopes, Theory, and
Application",
Prentice-Hall Inc ., Englewood Cliffs, New
Jersey,
1968 .
1- 1 4
J . Czech, "Oscilloscope Measuring Techniques",
Springer-Verlag, New York, 1965 .
J . F . Golding, "Measuring Oscilloscopes",
Transatlantic
Arts, Inc ., 1971 .
Charles
H . Roth Jr ., "Use of the Oscilloscope", A
Programmed text, Prentice-Hall Inc ., Englewood Cliffs,
New Jersey, 1970 .
Repackaging for Shipment
If the Tektronix
instrument is
to be
shipped to a Tektronix
Service
Center for service or repair, attach a tag showing :
owner (with address)
and the name of an individual at your
firm
that
can be contacted, complete instrument serial
number and a description of the service required .
Save and re-use the package
in which your instrument was
shipped .
If the original packaging is unfit for use or not
available, repackage the instrument as follows :
Surround the instrument with
polyethylene sheeting to
protect the finish of
the instrument
.
Obtain a carton of
corrugated cardboard of
the correct carton strength and
having inside dimensions of
no less than six inches more
than the instrument
dimensions . Cushion the instrument
by tightly
packing three inches of dunnage or urethane
foam between carton and
instrument, on all sides . Seal
carton with shipping tape or
industrial stapler .
The carton test strength
for your instrument is 375 pounds .
REV . B, NOV . 1976

Information
given in this manual applies to
the R7603
Oscilloscope also,
unless otherwise indicated .
The R7603 is
electrically identical to the 7603,
but it is adapted for
mounting in a standard 19-inch
rack . Rackmounting
instructions and a dimensional
drawing for the R7603 are
given in Section 6 .
This
instrument will meet the following
electrical
specifications
after complete calibration as
given in Section
5 .
The Operating Checkout procedure
which is given in
Section
1 provides a convenient
method of checking
instrument performance without making
internal checks or
adjustments
.
The following electrical
characteristics apply
over an
ambient temperature range of 0 ° C
to +50 ° C, except
REV . B, NOV . 1976
SPECIFICATION
VERTICAL
DEFLECTION SYSTEM
Section 2-7603/R7603 Service
as
otherwise indicated . Warmup
time for given accuracy is
20
minutes . Limits and tolerances
given in the Supplemental
Information column are provided
for user information only,
and
should not be interpreted as
Performance
Requirements
.
NOTE
Many
of the measurement capabilities of
this
instrument are determined by the
choice of plug-in
units . The following
characteristics apply to the 7603
Oscilloscope only
. See the System Specification at
the end of
this section for specifications of the
complete
system .
Characteristic
Performance
Requirements Supplemental
Information
Deflection Factor
Compatible with
all 7000-series plug-in
units .
BetweenCompartments
Within 1% .
Low Frequency
Linearity 0 .1 division or
less compression or
expansion of a
center-screen 2 division
signal when
positioned anywhere ver-
tically
within the graticule area .
Bandwidth
See system
specifications for 7000-series
instruments
.
7603 Vertical
Amplifier only DC to at least
115 MHz .
(6 div
Reference ; 0 ° C to +50 °
C)
Step Response Risetime
See system
specifications for 7000-series
instruments
.
Isolation Between Vertical
At least 100 :1 from
DC to 100 MHz .
Compartments
Delay
Line
Permits viewing
leading edge of trigger
signal .
Chopped Mode
Repetition Rate
1 MHz
within 20% .
Time
Segment From Each 0 .4 to 0 .6 Ms .
Compartment