Tektronix 7313/R7313 User manual

7313/R7313
I
OSCILLOSCOPE
MTM OPTIDMS
OPERATORS

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97005
TH OPT
IONS
OPERATORS
INSTRUCTION MANUAL
Serial Number
First Printing JULY 1974

WARRANTY
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TEKTRONIX instruments are warranted against
defective materials
and workmanship for one year.
Any questions with respect to the warranty should
'be taken up with yourTEKTRONIX Field Engineer or
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reques
.. rn mm.
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or representative in your area. This will assure you
the fastest possible service. Please include the
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ecificatir
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th all rer
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~r parts
lnge
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tmnix, I
zd State!
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rty11ia reacr~ed. COIIL~II~P VI 11113 ~UUIIC~~~IUII IIIO~ 11~1
be reproduced in any form without permission of
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gistered irk of Tektronix,

7313lR7313 Operators
TABLE OF CONTENTS
LlST OF ILLUSTRATIONS
LlST OF TABLES
SECTION 1 OPERATING INSTRUCTIONS
PreliminaryOperation
Safety Information
OperatingVoltage
Plug-InUnits
Controlsand Connectors
External
Internal
FamiliarizationProcedure
Set-Up Information
Display Controls
Vertical and Horizontal System Controls
Calibrator and Triggering Controls
Storage Controls
General Operating Information
Intensity Controls
Display Focus
Graticule
Beamfinder
Vertical Mode
Trigger Source
Readout (Deletedby Option 1)
Storage Operation
Calibrator
Signal Outputs
RemoteSingle Sweep Reset
(Delete with Option 7)
Display Photography
X-Y Operation
Intensity Modulation
Raster Display
Applications
SECTION
2 SPECIFICATION
General
StandardAccessories
System Specifications
SECTION
3 RACKMOUNTING INSTRUCTIONS
lnstrument Dimensions
Rack Dimensions
Slide-OutTracks
MountingProcedure
Removing Or InstallingThe lnstrument
Slide-OutTrack Lubrication
SECTION
4 INSTRUMENTOPTIONS
Option 1
Option 3
Option
5 (Rackmountlnstrumentonly)
Option 7
Page
I I
iii

7313lR7313 Operators
Figure
1-1
LIST OF ILLUSTRATIONS
Page
Frontispiece
Location of voltage selector, spare
jumper, and alternate fuse in power unit
(7313shown).
Front-panelcontrols and connectors.
Rear-panelcontrols and connectors.
Location and function of internal
selectors.
Definition of measurement lines on the
7313lR7313 graticules.
Location of the readout on the crt
identifying the originating plug-in
compartment and channel.
Slideout track assembly.
Vertical mounting position of the left
stationary section and location of the
thumbscrew securing hole. These
dimensions also apply to the right front
rail.
Details for mounting stationary sections.
Installing and removing the instrument.
Adjusting the slide-outtracks for smooth
slidingaction.
R7313 dimensional drawing.

7313lR7313 Operators
LIST OF TABLES
Table
1-1 Color Codingof Cord Conductors
1-2 Regulating Range and Fuse Data
2-1 Electrical Specifications
2-2 Environmental Specifications
2-3 Physical Specifications
2-4 System Vertical Specifications
4-1 Option Information Locator
Page
1-1
1-2
2-1
2-7
2-7
2-8
4-1
NOTE
Refer to the 7313lR7313 Service manual for circuit
description, maintenance, calibration, diagrams, and
parts replacement information.

7313JR7313 FEATURES
The Tektronix 7313/RJ313 Oscilloscope is a solid-state instrument designed for general-purpose application where
display storage is desired along with high performanceconventional (non-store)operation. This instrumenthas three plug-in
compartments that accept Tektronix 7-Series plug-in units
to form a complete measurement sysrem. The two plug-in
compartments on the left are connected
to the vertical deflection system. The right plug-incompartment is connectedtothe
horizontal deflection system. Eleczronic switching between the vertical
plug-in compartments allow a multi-tracevertical
display. The flexibility of this plug-in feature
and the variety af plug-inunits available allow this system to be used for many
applications.
The cathode
ray tube is a direct view. bi-stablestorage tube having an 8 x 10 division display area divided into two
4 x 10 division storage screens, The storage screens are independently controlled for split screen applfcations. A non-storing
area to the leftof the storage screens permits
beam location without disturbing a stored display. Regulated dc power supplies
assure that performance
is not affected by variations in line voltage and frequency, or by changes in load due to varying
power requirements of the plug-inunits.
The 7313/R7313 operates from a 115 volt or a 230 volt nominal line voltage source.
7313/R7313 Operators 8

Section 1-731 3lR7313 Operators
OPERATING INSTRUCTIONS
To effectively use the 7313/R7313 Oscilloscope, the the instrumentframe. for electric-shock protection,insert
operation and capabilities of the instrument must be this plug only in a mating outlet with a safety-earth
known. This section describes the operation of controls contact, or otherwise connect the frame to a safety-earth
and connectors and gives basic and general operating system. The color-coding of the cord conductors is in
information. accordance with recognized standards as shown in
Table
1-1.
PRELIMINARY OPERATION
Power Cord Conductor Identification
SAFETY INFORMATION
Conductor Color Alternate Color
This instruction manualcontains informative and war-
ning text which the user must follow to ensure safe Ungrounded (Line) Black
White
operation and to retain the instrument in safe condition. Grounded (Neutral)
Grounding (Earthing) Green-Yellow Green-Yellow
AC POWER SOURCES. This instrument is intended to
be operated from a single-phase earth-reference power
source having one current-carrying conductor (the
Neutral Conductor) near earth potential.Operation from
power sources where both current-carrying conductors
are livewith respecttoearth (suchas phase-to-phaseona
three-wire system) is not recommended, since only the
Line Conductor has over-current (fuse) protection within
the instrument.
AC POWER CORD. This instrument has a three-wire
power cord with a three-terminal polarized plug for
connection to the power source and safety earth. The
safety-earth terminal of the plug is directly connected to
OPERATING VOLTAGE
The7313/R7313 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 linevoltage source. Usethe following procedure
to obtain correct instrument operation from the line
voltage available:
1. Disconnect the instrument from the power source.
REV. C, AUG. 1976

Operating Instructions-7313/R7313 Operators
2. To gain access to the voltage selector jumper, nominal linevoltage. Usethe fuse located in the Alt Fuse
perform the applicable procedure which follows: holderonthe Rectifier board (seeFig. 1-1for locationand
Table 1-2for fuse type). Also changethe line-cord plugto
7313. ~emovethree screws fromeachsideofthe Power match the power-source receptacle or use a suitable
unit.Slidethe power unitoutofthe rearofthechassis (see
adapter,
Fig. 1-1).
R7313. Remove the top cover and remove the power
unit from the rear of the instrument. See Power Unit
Removal in the Maintenance section.
CAUTION
This instrument may be damaged if operated with
the Line Selector set to the incorrect positions for
the line voltage applied.
3. To convert from 110-volts to 220-volts nominal line
voltage,orvice versa, removethevoltage-selector jumper
and replace it with the spare jumper stored on the pins
adjacent to voltage selector area (see Fig. 1-1). The
jumpers are color coded to indicate the nominal voltage
for which they are intended; brown for 110-volt nominal
operationand redfor 220-volt nominaloperation.Change
the rear-panel fuse to provide protection for the selected
4. Toconvertthe instrumentfromoneregulatingrange
to another, remove the voltage selector jumper and
reinstall it on the set of pins that represents the desired
regulating range.Select a rangethat iscenteredaboutthe
average line voltage to which the instrument is to be
connected (see Table 1-2).
TABLE 1-2
Regulating Range and Fuse Data
REMOVE THREE
SCREWS FROM EACH
RECTIFIER
REMOVE POWER UNIT
FROM OSCILLOSCOPE
I
Pins
Selected
LOW
MED
HI
Line Fuse
Fig. 1-1. Locations of voltage selector, spare jumper, and alternate fuse in power unit (7313 shown).
Regulating Range
110-volts nominal
90 to 110 volts
99 to 121 volts
108 to 132 volts
3.2 A slow-blow
220-volts nominal
180 to 220 volts
198 to 242 volts
218 to 262 volts
1.6 A slow-blow

Operating Instructions-7313fR7313 Operators
PLUG-IN UNITS
The 7313lR7313 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 polarity,sensitivity,display mode, etc.tomeet
the measurement requirements. In addition, itallows the
oscilloscope system to be expaned to meet future
measurement requirements.Theoverallcapabilitiesofthe
resultant system are in large part determined by the
characteristics of the plug-in selected. Refer to the
Tektronix Products catalog for specifications of plug-in
units currently available.
To install a plug-in unit into one of the plug-in
compartments,align theslots inthetopand bottomofthe
plug-in with the associated guide rails in the plug-in
compartment. Pushthe plug-in unitfirmly intotheplug-in
compartment until it locksintoplace.Toremoveaplug-in,
pull the release latch on the plug-in unit to disengage it
and pullthe unit out of the plug-in compartment. Plug-in
units can be removed or installed without turning off the
instrument power.
All of the plug-in compartmentsdonothave to befilled
to operate the instrument; the only plug-ins needed are
those required for the measurement to be made. At
environmental extremes, excess interference may be
radiated into or out of the instrumentthroughthe plug-in
compartments. To reduce such interference, or to meet
EM1 specifications on factory equipped Option 3 or field
EM1 modified instruments, all unused plug-in com-
partments must be covered with an EM1 shielded blank
plug-in panel. Order or use only Tektronix Part No.016-
0155-00. One is required for each unused compartment.
When the 7313/R7313 is calibrated inaccordance with
the calibration proceduregiven intheservice manual,the
vertical and horizontal gains are normalized. This allows
calibrated plug-in units to be changed from one plug-in
compartment to another without recalibration. However,
the basic calibration of the individualplug-in unitsshould
bechecked when they are installed inthissystemtoverify
their measurement accuracy. See the operating instruc-
tions section of the plug-in unit instruction manual for
verification procedure.
The plug-in versatility of the 7313/R7313 allows a
variety of display modeswith manydifferentplug-in units.
Thefollowing information is providedtoaidinplug-in unit
selection.
To produce a single-trace display, install a single-
channel vertical unit (or dual-channel unit set for single-
channeloperation) in eitherof thevertical compartments;
for dual-trace displays, either install a dual-channel
vertical unit inoneofthevertical compartmentsor installa
single-channel vertical unit ineach vertical compartment.
A combination of a single-channel and dual-channel
vertical unit allows a three-trace display; likewise, a
combination of two dual-channel vertical units allows a
four-trace display.
Non-delayed single-trace displays can be obtained
with a single-trace time-base unit.
A dual-trace time-base
unit must be used for delayed-sweep displays.
X-Y displays can be obtained in two ways with the
7313/R7313 system. If a 7B-series time-base unit is
available that has an amplifier feature, the
X signal can
either be routed through one of the vertical units via the
internal-trigger pickoff circuitry to the horizontal system,
orconnected totheexternal horizontalinputconnector of
the time-base unit. Then, the vertical signal
(Y) is con-
nected to the remaining vertical unit. Also, a 7A-series
amplifier plug-in can be installed inone of the horizontal
compartments for X-Y operation.
Special purposeplug-ins mayhavespecific restrictions
regardingthe plug-in compartments inwhich they can be
installed.This information will begiven in the instruction
manuals for these plug-ins. Refer to the Tektronix
Products catalog for additional information on plug-in
unit selection.
NOTE
Later production of rackmount ocilloscopes are
providedwith support posts between the individual
plug-in compartments.
A post or posts must be
removedifa multi-widthplug-inisto
be installed. To
removea post, unfasten the screws that secureitat
the top andbottom of the plug-in housing.
CONTROLS AND CONNECTORS
EXTERNAL
The major controls andconnectors for operationofthe
7313/R7313 are located on the front panel of the instru-
ment and several auxiliary functions are providedon the
rear panel. Fig. 1-2 provides a brief description of the
front-panelcontrolsandconnectorsandFig. 1-3provides
a brief description of the rear-panelcontrols and connec-
tors. More detailed information is given under General
Operating Information.
REV. B, JULY, 1975

Operating Instructions-7313/R7313 Operators
a INTENSITY. Varies brightnessof cit display.
@ READOUT. Varies brightness of rsadout portion of cn display.
@ FOCUS. Provides optimum display definition.
@ BEAMFINDER. Returns crt display by compressingvertical and horizontal deflection within graticuls area.
@ GRAT ILLUM. Varier gratieule illumination.
@ TRIG SOURCE. Selects source of trigger signal for time-bassunit.
@ VERT MODE. Selects vertical plug-incompartment that provider vertical deflection signal.
@ STORE (UPPER and LOWER). Selects storage operation.
@ ENHANCE [UPPER and LOWER). Increaser writing rate for storage of single sweep displays.
10 AUTO ERASE {UPPER and LOWER). Stores the crt display at the end of each sweep and inhibitsfurther
O sweeps for a time selected by the VIEW TIME control.
@ ERASE (UPPER and LOWER). Manually eraser stored diglay.
@ VIEW TIME. Determiner variable viewing interval of stored display.
@ LOCATE. Pushbuttan switch unblankr the crt to pravids in indication of the sweep starting point.
@ INTEGRATE. Permits storage of very fast rap~titivesignals.
@ ENHANCE Level (Level not labeled). Provides a selectable increase in writing speed for single sweep displays.
@ CALIRRATOR Pin jack< pmvirlr rl V, 0.4 V, and 40 rnV ~utputs st a OM kilohertz repetition rate. Oc
output can be selected by an internal selector.
@ POWER. POWER switch controls power to the instrurnenl; POWER light indicates that the power switch is
on and the instrument is connected to the pawer source.
@ Camera Power (not labeled). Provider pawer output and receives remote single sweep reset for compatible
camera systems.
fig. 1-2. Front-pmel controls and connectom.

Operating Instructions-7313ER7313 Operators
@ FUSE. Linevoltage fuse for instrument.
VERT SIG OUT (Deletewith Option 7). Vertical signal selected by TRIG SOURCE and VERT MODE
@ switches (Left, Right. Alf. and Add).
@ +GATE OUT (Deletewith Option 7). Gate rignalselected by rear-panel gate selector switch (MAIN,
AUXILIARY, and
DELAY).
@ + SAWTOOTH OUT (Delete with Option 71. Positive-goingsawtooth signal from time-baseunit.
@ REMOTE ERASE IN (Deletewith Option 7). Provider input for an external rignal to erase the stored display.
@ EXT SS RESET IN (Deletewith Option 7). Provider inputfor an external rignal to reset the sweep (Time-
base unit operating in Single Sweep mode).
@ EXT Z AXIS IN. Input for intensity modulation of crt display.
Flg. 6-3. Rear-panel controls and connectors.

Operating Instructions-7313/R7313 Operators
INTERNAL
SET-UP INFORMATION
Several switch functions are located on circuit boards
within the instrument.A brief description of each internal
switch is given in the following discussion.
REMOTE ERASE SELECTOR. Internal multi-pin con-
nector (located on Storage Switch circuit board) to
determine whether the external signal, applied to the
REMOTE ERASE INconnector, erases the upper storage
screen,lowerstoragescreen,orbothstoragescreens. See
Fig. 1-4 for further information.
CALIBRATOR SELECTOR. Internalmulti-pin connec-
tor (located on the Calibrator circuit board) to determine
whether the CALIBRATOR output is a one-kilohertz
square-wave signal or a dc voltage level. See Fig. 1-4 for
further information.
READOUT MODE SWITCH. Two-position switch
(located on the Readout circuit board) to determine
whether the readout display is present independent of a
sweep (freeruns)or istriggered at theend of eachsweep.
See Fig. 1-4 for further information.
VOLTAGE SELECTOR. Multi-pin connector selects
Low,Medium,or Highvoltage regulatingrange.Themulti-
pinconnector can beexchanged to select 110-voltor220-
volt nominal line voltage source. See Fig. 1-1 and
Preliminary Operation,inthis section,for further informa-
tion.
FAMILIARIZATION PROCEDURE
The following procedure may be used for familiariza-
tion with the 7313/R7313 or as acheck of basic instrument
operation. If performance of the Familiarization
Procedure reveals improper calibration or instrument
malfunction, first check the operation of the associated
plug-in units; then refer to the Calibration and
Maintenancesections of the7313/R7313 Service Manual.
A Set-Up Status summary, preceding each major
section of the Familiarization Procedure, provides the
settings of controls and liststhe signals connectedatthat
point in the procedure.
1. Set the front-panel controls as follows:
INTENSITY Midrange
FOCUS Midrange
READOUT OFF (counterclockwise
into switch detent)
GRAT ILLUM (screw- Counterclockwise
driver adjustment)
VERT MODE LEFT
TRIG SOURCE VERT MODE
STORE (UPPER Off (push button out)
and LOWER)
ENHANCE (UPPER Off (push button out)
and LOWER)
AUTO ERASE (UPPER Off (push button out)
and LOWER)
2. Connect the 7313/R7313 to a power source that
meets the voltage and frequency requirements of the
instrument. Iftheavailablelinevoltage isoutsidethelimits
of the Voltage Selector, see OperatingVoltage discussion
in this section.
3. Insert Tektronix 7A-series amplifier units into both
the LeftVertical and RightVertical compartments.lnserta
76-series dualtime-base unitintotheHorizontalcompart-
ment.
4. Turn the POWER switch ON. Allow several minutes
warm-up so that the instrument reaches a normal
operating temperature before proceeding.
5. Connect a BNC-to-pin-jack cable from the 4 V
CALIBRATOR output to the amplifier unit installed inthe
Left Vertical compartment.
6. Set bothvertical units for avertical deflection factor
of two volts/division and center the vertical position
controls. Set both vertical units for ac input coupling.
7. Setthetime-base unit intheHorizontalcompartment
for a sweep rate of one millisecond/division. Set the
triggering for the auto mode,internalsource,ac coupling,
and adjust for a stable display. Position the display as
necessary.

Operating Instructions-7313lR7313 Operators
Fig. 1-4. Locationand function of internal selectors.

Operating Instructions-7313lR7313 Operators
DISPLAY CONTROLS
8. Adjust the INTENSITY controlthroughout its range;
thenadjustsothatthetraceisatthedesired viewing level.
9. Adjust the FOCUS control so the top and bottom of
the displayed square wave are as thin as possible butnot
elongated.
NOTE
The oscilloscope system contains circuitry to
automatically protect the crtagainst damagedue to
excessive crtbeam current. Ifthe intensitycontrolis
set to a point where crt phosphor damage could
occur, these circuits limitthe beamcurrentto asafe
level. The circuit action will also cause the trace to
defocus (widen), which indicates that the INTEN-
SITY should be reduced. Therefore, if the FOCUS
adjustment cannot be made satisfactorily, reduce
the INTENSITYand repeat step
9.
10. Rotate the GRAT ILLUM screwdriver control
throughout its rangeand noticethatthegraticuleIinesare
illuminated as the control is turned clockwise. Set the
control so that the graticule lines are illuminated as
desired.
11. Set the deflection factor of the LeftVertical plug-in
unitto0.1 volt/division. Noticethat asquare-wave display
isnotvisible,since the deflectionexceeds thescanareaof
crt.
12. Press the BEAMFINDER. Notice that the display is
returned to the viewing area in a compressed form.
Release the BEAMFINDER switch and notice that the
display again disappears from the viewing area.
13. With the BEAMFINDER switchpressed in,increase
the deflection factor of the Left Vertical
BE nit until the
display is reduced toabout two
divisionsvertically.Adjust
the Left Vertical unit position control to center the
compressed display about the center of the graticule.
Release the BEAMFINDER and notice that the display
remains within the viewing area.
NOTE
Readout operation steps apply only when the
7313/R7313 and the plug-in units installed in the
7313/R7313 are equipped with a Readout System.
73131R7313 Oscilloscopes with Option 1 do not
contain a Readout System.
14. Turn the READOUT control clockwise (out of
switch detent) until an alphanumeric display is visible
within the top or bottom division of the crt. Change the
deflection factor ofvertical unitthat isselectedfor display.
Notice that the readout portionof the display changes as
the deflection factor is changed. Likewise, change the
sweep rate of the time-base unit and notice that the
readout display for the time-base unit changes as the
sweep rate is changed.
15. Sequentially select all of the VERT MODE push
buttons. Notice that the readout from a particular plug-in
unit occupies a specific location on the display area. If
either of the plug-in units is a dual unit, notice that the
readout for channel
2 appearswithin the lowerdivision of
the crt. Return the VERT MODE switch to LEFT.
16. Set the time-base unit for magnified operation.
Notice that the readout display changes to indicate the
correct magnified sweep rate. If a readout-encoded 10X
probe isavailable for usewith the vertical unit,install iton
the input connector of the Right Vertical plug-in unit and
set the VERT MODE switch to RIGHT. Notice that the
deflection factor indicated by the readout is increased by
10 times when the probe is added. Return the time-base
unit to normal sweep operation and disconnect the 10X
probe.
17. Switch the vertical and horizontal unit deflection
switches (Volts/Div, Time/Div) to the uncalibrated posi-
tion. Notice the
> symbol that precedes the readout
display. Return the vertical and horizontal unit deflection
switches to the calibrated position.
VERTICAL AND HORIZONTAL SYSTEM CON-
TROLS
Set the 7313/R7313 controls as follows:
INTENSITY
FOCUS As desired
As desired
READOUT As desired
GRAT ILLUM (screw- As desired
driver adjustment)
VERT MODE ALT
TRIG SOURCE VERT MODE
STORE (UPPER Off (push button out)
and LOWER)
ENHANCE (UPPER Off (push button out)
and LOWER)
AUTO ERASE (UPPER Off (push button out)
and LOWER)
CALIBRATOR 4 V output connected to
the Left Vertical and
Right Vertical units
withaBNC-to-pin-jack
cable and a BNC-to-
BNC jumper lead.

Operating Instructions-7313/R7313 Operators
Set the associated equipment as follows:
Left Vertical unit Deflectionfactor,2V/Div;
position, centered in
the top half of the
graticule; input
coupling ac.
Right Vertical unit
Horizontal unit
Deflectionfactor,2V/Div;
position, centered in
the bottom half of the
graticule; input
coupling, ac.
Deflection factor, 1 ms;
triggering, auto mode,
ac coupling, internal
source, level adjusted
for stable display.
18. Set the VERT MODE switch to LEFT. Rotate the
position controls of the Left and Right Vertical units and
notice that the position control of only the Left Vertical
unit has any affecton thevertical positionofthedisplayed
trace.
19. Select theRIGHTVERT MODE.Noticethatonlythe
position controlofthe RightVertical unithasanyaffect on
the vertical position of the displayed trace.
20. Select theALT VERT MODE. Noticethattwotraces
are displayed on the crt. The upper trace is produced by
theLeftVertical unitandthelowertrace isproducedbythe
Right Vertical unit. Change the sweep rate of the time-
base unit to 50 millisecond/division. Notice that the
display alternates between the Left Vertical and Right
Vertical plug-in units after each sweep. Returnthe sweep
rate to one millisecond/division.
21. Select the CHOP VERT MODE. Notice that two
traces are displayed on the crt. Both vertical units are
displayed on each sweep on a time-sharing basis.
22. Select the ADD VERT MODE. Check for an added
display approximately four divisions iri amplitude.Notice
thatthepositioncontrolof either vertical unitwillvertically
position the added display. Return the VERT MODE
switch to LEFT.
CALIBRATOR AND TRIGGERING CONTROLS
Set the 7313/R7313 controls as follows:
INTENSITY As desired
FOCUS As desired
READOUT As desired
GRAT ILLUM (screw- As desired
driver adjusment)
VERT MODE ALT
TRIG SOURCE VERT MODE
STORE (UPPER Off (push button out)
and LOWER)
ENHANCE (UPPER Off (push button out)
and LOWER)
AUTO ERASE (UPPER Off (push button out)
and LOWER)
CALIBRATOR
4 V output connected to
the Left and Right
Vertical units with a
BNC-to-pin-jack
cable and a BNC-to
BNCjumper lead.
Set the associated equipment as follows:
Left Vertical unit Deflectionfactor,2V/Div;
position, Left Vertical
unit display centered
in the top half of the
graticule; input
coupling, ac.
Right Vertical unit Deflectionfactor,2V/Div;
position, RightVertical
unit display centered
in the bottom half
of the graticule; input
coupling, ac.
Horizontal unit Deflection factor, 1 ms;
triggering, auto mode,
ac coupling, internal
source, level adjusted
for a stable display.

Operating Instructions-7313lR7313 Operators
23. Set the VERT MODE switch to LEFT. Change the
CALIBRATOR pin-jacks and notice that 4 V, 0.4 V, and
40 mV outputs can be obtained (changethe amplifier unit
defection as necessary).The CALIBRATOR output must
beterminated inaone-megohm loadforstated output.Set
The CALIBRATOR pin-jacks for 4 V output and set the
amplifier deflection factor to two volts/division.
24. Adjust the time-base unit triggering controls for a
stable display. Disconnect the CALIBRATOR signal froni
the RightVertical unit.Sequentially select allVERT MODE
switch settings. Noticethat a stabledisplay is obtained in
all positionsof theVERT MODEswitch (asreferencetrace
is provided in the RIGHT VERT MODE position).Adjust
the time-base unit triggering level control as necessary.
25. Set theTRlG SOURCE switchto LEFT.Sequential-
ly select all VERT MODEswitching settings. Noticethat a
stable display is obtained in all positions of the VERT
MODE switch (a referencetrace is provided inthe RIGHT
VERT MODE position).Adjust the time-base unit trigger-
ing level control as necessary.
26. Set the TRlG SOURCE switch to RIGHT.Sequen-
tially selectallVERT MODEswitchsettings and noticethat
astable display cannot beobtainedinany position.This is
because there is no input signal connected to the Right
Vertical unit.
27. Disconnect the 4 V CALIBRATOR signal from the
Left Vertical unit and connect it to the RightVertical unit.
Sequentially select all VERT MODE switch settings.
Notice that astable display is obtained in all VERT MODE
switch settings (a reference trace is provided inthe LEFT
VERT MODE position). Adjust the time-base unittrigger-
ing level control as necessary.
28. Set the TRlG SOURCE switch to VERT MODE.
Sequentially select all VERT MODE switch settings.
Notice that astable display isobtained in all VERT MODE
switch settings (a reference trace is provided inthe LEFT
VERT MODE position). Adjust the time-base unittrigger-
ing level control as necessary.
29. Set theTRlG SOURCEswitch to LEFT.Sequential-
ly select all VERT MODEswitch settings and noticethat a
stable display cannot be obtained in any position. This is
because there is no signal connected to the Left Vertical
unit.
31. Set theVERT MODEswitch to CHOPand theTRlG
SOURCE switch to LEFT and then to RIGHT. Noticethat
the chopped display can be triggered from either vertical
compartment.
STORAGE CONTROLS
Set the 7313/R7313 controls as follows:
INTENSITY As desired
FOCUS As desired
READOUT As desired
GRAT ILLUM (screw-
, As desired
driver adjustment)
VERT MODE CHOP
TRIG SOURCE LEFT
STORE (UPPER Off (push button out)
and LOWER)
ENHANCE (UPPER Off (push button out)
and LOWER)
AUTO ERASE (UPPER Off (push button out)
and LOWER)
CALIBRATOR 4 V output connected to
the Left and Right
Vertical units with a
BNC-to-pin-jack
cable to a BNC-to-
BNC jumper lead.
Set the associated equipment as follows:
Left Vertical unit Deflectionfactor,2 V/Div;
position, Left Vertical
unit display centered
in the top half of the
graticule; input
coupling, ac.
Right Vertical unit Deflectionfactor, 2V/Div;
position, RightVertical
unit display centered
in the bottom half
of the graticule; input
coupling, ac.
Horizontal unit
30. Connect the 4 V CALIBRATOR signal to both
vertical units. Set the TRlG SOURCE switch to VERT
MODE and the VERT MODE switch to ALT. Check that
both traces of the alternate display are stable.
Deflection factor, 1 ms;
triggering, auto mode,
ac coupling, internal
source, level adjusted
for a stable display.

Operating Instructions-731 3lR7313 Operators
32. Turn the INTENSITY control fully coun-
terclockwise. Press in both STORE push buttons. Notice
the normal storage mode background light level present
on the storage screens. Advance the INTENSITY control
slowly clockwiseto produceawaveformdisplay of normal
intensity; then return the INTENSITYcontrolto minimum
intensity (fully counterclockwise). Notice a stored
waveform of moderate brightness. Press the UPPER
ERASE push button and then the LOWER ERASE push
button. Notice that each half of the crt display can be
erased or stored independently.
33. Set both STORE push buttons to their non-store
position (push buttons out).Set the 7313/R7313 and the
associated plug-in units for a stable display of normal
intensity. Set the time-base unit for single sweep opera-
tion and engage both 7313/R7313 STORE push buttons.
Apply a singlesweep trace by pressingthe time-base unit
reset push button. Notice a stored display on the UPPER
and LOWER storage areas. If the display is not stored,
increase the INTENSITY and repeat the demonstration.
34. Press both ERASE push buttons. Press the
LOCATEpush buttonand noticedots slightly totheleftof
the sweep starting point.The LOCATE function is useful
to locateand position thetrace while the sweep is heldoff
(single sweep operation). Return the time-base unit to a
normal triggering mode (non-single sweep), and adjust
for a stable display.
35. Engage both AUTO ERASE push buttons. Notice
that one sweep is displayed onthe crtand further sweeps
are lockedout untilthestoreddisplay iserased. Rotatethe
VIEW TIME controlthroughout itsrangeandnotethat this
controlvaries the amount of time that the display remains
stored before it is erased.
36. Rotate the VlEW TlME control fully clockwise. As
soon as the display is automatically erased and another
trace is stored, press both ERASE push buttons. Notice
that the crt is erased and other sweeps are locked out
during the period selected by the VlEW TlME control.
Disengage both AUTO ERASE push buttons and both
STORE push buttons (push buttons out).
37. Set the time-base unit time/division switch to
0.2 microseconds/division.Adjustthe INTENSITYcontrol
fullyclockwise.Positiontherisingportionof thewaveform
within thegraticulearea.Adjustthe INTENSITYcontrolso
that the trace is just visible. Press both STORE push
buttons. Notice the normal storage mode background
light on the crt. Press the INTEGRATE push button
momentarily (afraction of a second to several seconds is
reasonable). Notice a normal fully-stored display. If the
trace does not fully store on the first attempt, repeat the
integration for a longer period or with higher intensity.
Disengage both STORE push buttons and press both
ERASE push buttons. Remove the CALIBRATOR signal
from both vertical units.
38. Apply a sine-wave signal of approximatley
300 kilohertz to the Left Vertical unit. Set the TRIG
SOURCE and VERT MODE switches to LEFT.Adjust the
amplifier unit for three divisions of display, centered on
the graticule. Adjust the oscilloscope INTENSITY for a
moderately bright trace. Set the time-base unit for single
sweep operation and engage both 7313/R7313 STORE
push buttons. Pressthe time-base unit reset push button
to obtain a single sweep trace. Notice that a complete
stored display cannot be obtained at any setting of the
INTENSITY control.
39. Press both ERASE push buttons; then press both
ENHANCE push buttons. Apply a single sweep trace by
pressing the reset push button.While repeatedly erasing
and applying asingle-sweep signal, adjustthe ENHANCE
Level control sufficiently clockwise to completely store
the display without fading the target positive (it may be
necessary to vary the oscilloscope intensity).
GENERAL OPERATING INFORMATION
INTENSITY CONTROLS
The 7313/R7313 has separate intensity controls for
display and display readout. The INTENSITY control
determines the brightness of only the signal display; the
READOUT control determines the brightnessof only the
readout portion of the crt display.
The setting of the INTENSITY control may affect the
correct focus of the display. Slight re-adjustment of the
FOCUScontrol may be necessary when theintensitylevel
ischanged. Donotturn the intensitycontrol higherthan is
necessary to provide a stable display.
Be careful that the INTENSITY control is not set too
high when changing thetime-base unitsweep ratefrom a
fast to a slow sweep rate or when changing to the X-Y
modeof operation. The oscilloscopesystem incorporates
protection circuitry which automatically reduces the
display intensitytoa lower levelwhenthetime-base unitis
set to a slow sweep rate. This reduces the danger of
damaging the crt phosphor at slower sweep rates.
CRT lightfilters reduce the observed light outputfrom
the crt. When using these filters, avoid advancing the
INTENSITY control to a setting that may burn the crt
phosphor.

Operating Instructions-7313lR7313 Operators
DISPLAY FOCUS LIGHT FILTER
The FOCUScontrol allows adjustment for best defini-
tion of the crt display. 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 in the
7313/R7313 Service Manual.
Thegraticule of the7313/R7313 ismarkedontheinside
of the faceplate of the crt, providing accurate, no-parallax
measurements. The graticule is divided intoeight vertical
and ten horizontal divisions. Each division is
0.975 centimeters square. Inaddition,eachmajordivision
is divided into five minor divisions. Thevertical gain and
horizontaltiming of the plug-in unitsare calibratedtothe
graticulesoaccurate measurementscanbemadefromthe
crt. The illumination of the graticule lines can bevaried
with the GRAT ILLUM screwdriver adjustment.
NOTE
Two types ofcrtgraticules have been usedinsome
Tektronix oscilloscopes. One graticule has
0% and
100% risetime referencepointsthatareseparatedby
6 verticalgraticuledivisions. Theothergraticulehas
the
0% and 100% risetime reference points
separated by 5 vertical divisions. Inyour manual,
illustrations of thecrtface orrisetimemeasurement
instructions may notcorrespondwith the graticule
markings on your oscilloscope.
Figure 1-5 shows the graticule of the 7313/R7313 and
defines the various measurement lines. The terminology
defined here will be used in all discussions involving
graticule measurements. Notice the O0/0, 10, 90, and 100
markingson the left side of thegraticule. These markings
are provided to facilitate risetime measurements.
SECOND CENTER TENTH
VERTICAL VERTICAL VERTICAL
LINE LINE LINE
1
CENTER
HORIZONTAL
LlNE
1362-5
Fig. 1-5. Definition of measurement lines on the 7313lR7313
graticule.
The tinted filters providedwith the 7313/R7313 reduce
lightreflections fromthefaceof thecrttoimprovecontrast
when viewing the display under high ambient light
conditions. The light bluefilter is recommendedprimarily
for non-storage operation and the light green filter is
recommended primarily for storage operation. These
filters should be removed for waveform photographs or
when viewing highwriting-ratedisplays.Togainaccessto
the light filter, remove the plastic frame mask.
The BEAMFINDER switchprovidesameansof locating
adisplay which overscans theviewing areaeithervertical-
ly or horizontally. When the BEAMFINDER switch is
pressed, the display is compressed within the graticule
area. To locate and reposition an overscanned display,
use the following procedure:
1. Press in the BEAMFINDER switch.
2. While the display is compressed, increase the ver-
tical and horizontal deflection factors until the vertical
deflection is reduced to about two divisions and the
horizontal deflection is reduced to about four divisions
(thehorizontaldeflection needs to bereduced onlywhen
operating in the
X-Y mode).
3. Adjustthevertical andhorizontalpositioncontrolsto
center thedisplay aboutthevertical and horizontal center
lines of the graticule.
4. Release the BEAMFINDER switch; the display
should remain within the viewing area.
VERTICAL MODE
LEFT AND RIGHT MODE. When the LEFT or RIGHT
pushbuttonof theVERT MODEswitchispressed,onlythe
signalfrom the plug-in unit intheselected compartment is
displayed.
ALTERNATE MODE. The ALT position of the VERT
MODEswitch produces a displaythat alternates between
the plug-in units-in the Left Vertical and Right Vertical
compartments with each sweep of the crt. Although the
ALT modecan be usedat all sweep rates,theCHOPmode
provides a moresatisfactory display at sweep ratesbelow
about 20 milliseconds/division. At these slower sweep
rates,alternate-mode switchingbecomesvisually percep-
tible.
The TRIG SOURCE switch allows selection of the
triggering for an alternate display.When this switch isset
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 the RIGHT positions,the two signals
are displayed showing true time relationship. However, if
thesignals are nottime-related, the display fromtheplug-
in unit which is not providing a trigger signal will appear
unstable on the crt.
REV. B, JULY, 1975

Operating Instructions-7313lR7313 Operators
CHOPPED MODE. The CHOP position of the VERT
MODE switch produces a display that 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
whenever 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 TRlG
SOURCEswitch.When theTRlGSOURCEswitchissetto
VERT MODE,the internaltrigger signals from thevertical
plug-in units are algebraically added and the time-base
unit istriggeredfrom the resultant signal. Useof theLEFT
or RIGHTTRlG SOURCE positionstriggersthetime-base
unitontheinternaltriggersignalfromtheselectedvertical
unit only. This allows two time-related signals to be
displayed showing true time relationship. However, if
signals are nottime-related, the display fromthechannel
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
mustprecedethe seconddisplay intime.Sincethesignals
show true time relationship, time-difference
measurements can be made from the display.
The following general precautionsshould beobserved
to provide the best display when using the ADD mode:
1. Donotexceed theinputvoltage ratingsoftheplug-in
units.
2. Do not apply large signals to the plug-in inputs. A
good ruletofollow is nottoapply asignal that exceedsan
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 ina
distorted display.
3. To ensure the greatest dynamic range in the ADD
mode, set the position controls of the plug-in units to a
setting which would result in a mid-screen display if
viewed intheLEFTorRIGHTpositionsof theVERT MODE
switch.
4. Forsimilar response fromeachchannel,set theplug-
in units for the same input coupling.
TRIGGER SOURCE
The TRlG 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
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
removean undesired signal, or for dcoffset (applyingadc
voltage to one channel to offset the dc component of a
signalontheother channel).Thecommon-mode rejection
ratio between the vertical plug-in compartments of the
7313/R7313 is
100:l from dc to 25 megahertz.
Theoveralldeflectionfactoronthecrt intheADD mode
istheresultantof thealgebraic additionofthesignals from
thetwovertical plug-in units. Itisdifficulttodeterminethe
voltage amplitude of the resultant display unless the
amplitude of the signal applied to oneof 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 polarityand
repetition rate of the applied signals enters into the
calculation.
internal trigger signal is automatically switched as the
VERT MODE switch is changed, or as the display is
electronically switched between the plug-in units in the
ALT positionof theVERT MODEswitch. Italso providesa
usable trigger signal intheADD or CHOP positionsof the
VERT MODE switch, since the internal trigger signal in
these modes isthe 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.
However,if correct triggering forthedesireddisplay isnot
obtained in the VERT MODE position,the trigger source
can bechanged to obtain the trigger signalfrom theplug-
in unit in either the Left Vertical or Right Vertical
compartment. The internaltrigger signal is obtainedfrom
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 isobtained fromoneof
the vertical units, but the othervertical unit is selectedfor
display, the internal trigger signal must betime-related to
the displayed signal in order toobtainatriggered (stable)
display.