Tektronix 7B53A User manual

PLEASE CHECK
FOR
CHANCE INFORMATION
ATTHE
REAR OF THIS
MANUAL .
IN
A/7N
A
TI
COMMITTED
TO
EXCELLENCE
N
MANIA .
Tektronix, Inc .
P .O .
Box 500
Beaverton, Oregon

97077
070-1342-01
Product

First
Printing SEP
1980
Group 42

Revised
MAY 1988

Copyright (~)
1972, 1980 Tektronix,
Inc . All rights reserved .
Contents of this
publication
may not be reproduced in
any
form
without the written
permission of Tektronix, Inc .
Products
of Tektronix, Inc . and
its subsidiaries are covered
by U .S .
and foreign patents and/or
pending patents .
TEKTRONIX, TEK,
SCOPE-MOBILE, and

V'
.

are
registered
trademarks of
Tektronix, Inc . TELEQUIPMENT
is a
registered trademark
of Tektronix U .K . Limited .
Printed
in U .S .A . Specification
and price change privileges
are
reserved .
INSTRUMENT SERIAL
NUMBERS
Each instrument has a
serial numberon a
panel insert, tag,
or
stamped on the
chassis . The first
number or letter
designates the
country of manufacture .
The last five digits
of the serial number
are assigned
sequentially and are
unique to each
instrument . Those
manufactured in the
United States have
six unique digits .
The country of
manufacture is
identified as follows :
13000000

Tektronix,
Inc ., Beaverton,
Oregon, USA
100000

Tektronix
Guernsey, Ltd .,
Channel Islands
200000

Tektronix United Kingdom,
Ltd
.,
London
300000

Sony/Tektronix, Japan
700000

Tektronix
Holland, NV, Heerenveen,
The
Netherlands

Section 1

SPECIFICATION ........ . .........
Section 2

OPERATING INSTRUCTIONS . .......
Controls and Connectors .... .......
Operating Checkout ...... . .
.......
General Operating Instructions . .
.....
Applications . . . . .............. . ...
Repackaging for Shipment ...... ....
REV DEC 198 2
LIST OF ILLUSTRATIONS

....... . . ...........
LIST OF TABLES

. .............. . . ..........
OPERATORS SAFETY SUMMARY

... . .........
SERVICE SAFETY SUMMARY ....... . .........
The
remaining portion of this Table of Contents lists the
servicing instructions
. 7hese servicing instructions are for
use by qualified
personnel only . To avoid electrical shock,
do notperform any
servicing other than that called out in the
operating instructions
unless qualified to do so .
Section 3
7B53A/7B53AN
Section 5

MAINTENANCE .......... .
. . . .... 5-1
Preventive Maintenance .... ..
...... 5-1
Troubleshooting . . . ............. . . .
5-2
Corrective Maintenance
......... . . . 5-4
Page Page
iii
Section
3 THEORY OF OPERATION
(cont'd)
iv
Delayed Trigger
Generator
v
(SN B209999 & Below)
............. 3-12
vii
Delayed Sweep
Generator
..........
3-12
1-1
Horizontal Preamp ......... ........
3-17
Readout Switching ........
. ....... 3-18
2-1
2-1
Section
4
CALIBRATION .
............. . ..... 4-1
2-3
Test Equipment Required
......... . . 4-1
2-6
PART 1 PERFORMANCE
CHECK . . . . 4-6
2-13
Trigger System Check ............. .
4-7
2-20
Horizontal System Check
........... 4-13
PART 2 ADJUSTMENT ............
4-20
Trigger System Adjustment
.......... 4-21
Horizontal System Adjustment
....... 4-24
THEORY
OF OPERATION . . . . . 3-1 . . . . . . . .
Section 6OPTIONS
.......... ... ...........
Simplified Block
Diagram ...... . . .... 3-1
Circuit Operation ..... . ...... . . .... 3-3
Main Trigger
Preamp . ........ . ..... 3-4
Section 7
REPLACEABLE ELECTRICAL
PARTS
Main Trigger
Generator (SN B210000
& Up7B53A Only) ..
...... . . ....... 3-4
Main Trigger
Generator (SN B209999
Section 8 DIAGRAMS
AND CIRCUIT BOARD
& Below) ........ . ........ .
....... 3-7
DESCRIPTIONS
Main Sweep Generator
... . . . ...... . 3-9
Delayed Trigger Generator
(SN B210000 &
Up7B53A Only) . ... . 3-12
Section 9 REPLACEABLE
MECHANICAL
PARTS

Fig .
No .
@ JUN 1980
Fig .
Page No .
7B53A/7B53AN
Typical delay time
error measurement . . .

4-16
Typical Delay
Time Error Figures
.
....
.

4-17
Allowable Delay Time
Error . ......... 4-17
Typical CRT display when checking
sweep
length .
....
.....
. . .......... . ...
4-25
Typical
CRTdisplayforadjwstmentof Dly'd
Sweep Start and Dly'd Sweep
Stop . .... 4-26
Location
of pins on interface connector
. . 5-3
Cam
Switch Removal ...............
5-7
illustrations in Section 8 are located
near their
ociated diagrams
on the foldout page .
Electrode configuration
for
semiconductors in the
instrument
.
Location
of circuit boards in the
7B53A/7B54AN
.
Partial
A1--Interface circuit board
component locator
(SN B090000 and up) .
Partial A1--Interface circuit
board
component locator (SN B089999
and
below) .
A2---Source
Switch circuit board
component locator .
A3--Coupling Switch circuit
board
component locator .
Partial
A4----Trigger circuit board
component
locator 7B53A only
(SN B210000 and up) .
Partial
A4---Trigger circuit board
component
locator (SN B209999 and
below) .
Partial
A6--Sweep circuit board
component
locator (SN B090000 and
up) .
Partial
A6---Sweep circuit board
component
locator (SN B089999 and
below) .
A5-Mode Switch circuit board .
Partial A4---Trigger circuit board
component
locator 7B53A only
(SN B210000 and
up)
.
A7--Delayed Trigger Switch
circuit board
component locator .
Partial
A4--Trigger circuit board
component
locator (SN B209999 and
below
Page
4-2
4-3
4-4
4-5
4-6
5-1
5-2
The
ass8-1
8-2
8-3
8-4
8-5
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14
.
7B53A/7B53AN Dual
Time Base ........
viii
2-1
Location of release latch ............
2-1
2-2 Front-panel
controls and connectors
. . . . 2-2
2-3
Frequency range of
each COUPLING
switch
position . . ................. 2-7
2-4 Effect
of LEVEL control and
SLOPE switch
on CRT display
. . . .... ..........
. .
2-9
2-5
Composite
Time/Division switch .......
2-10
2-6
Area of graticule used for
accurate time
measurements ....................
2-11
2-7 Operation
of Sweep Magnifier ........
2-11
2-8 (A) Intensified
Sweep display ; (B)
Delayed
Sweep display
. . . . ...... . . ........
2-12
2-9
Typical Mixed
Sweep display (DELAY TIME
MULT
dial set to 3 .55)
. . ............
2-12
2-10 DELAY "I"IME MULT
dial . Reading shown
3 .55 . . . . . . .....................
2-12
2-11 Measuring the time
duration between
points on a waveform
...............
2-15
2-12
Measuring risetime ................ 2-16
2-13
Measuring time
difference using delayed
sweep ....... . . . . . . . ...... .
. . . . . 2-17
2-14 Using delayed
sweep for magnification . .
2-18
2-15
Displaying a complex
signal using delayed
sweep . . . . ......................
2-19
2-16
Measuring pulse jitter ..............
2-20
3-1
7B53A/7B53AN Simplified Block Diagram
. 3-2
3-2 Trigger Preamp
and Input Switching
Block
Diagram . . ......................
3-5
3-3
Main Trigger Generator
Block Diagram
(SN B210000 and up 7B53A
only) . . . . . . 3-6
3-4 Main Trigger
Generator Block
Diagram
(SN B209999
and below) . . . . . . ....
. . 3-8
3-5 M
in Sweep Generator Block
Diagram . . 3-10
3-6 Delayed Trigger
Generator Block
Diagram
(SN B210000 and
up 7B53A only) . .....
3-13
3-7
Delayed Trigger Generator
Block Diagram
(SN B209999
and below) . ...........
3-14
3-8
Delayed Sweep
Generator Block Diagram .
3-15
3-9
Horizontal Preamp Block
Diagram . .... 3-17
4-1 Location
of Delayed Gate Outand
Variable
Selector
multi-pin connectors
. . ....... 4-2

7853A/71353AN
Fig .
No .
8-15
8-16
8-17
8-18
8-19
8-20
iv
Partial A6---Sweep
circuit
board
component locator (SNB090000and up) .
Partial A6--Sweep circuit board
component locator (SNB089999and
below) .
Partial
A1--Interface circuit
board (7B53A
only) component locator .
Partial A1--Interface circuit board
(7B53AN only) component locator .
A8--Readout circuit board (7B53A only)
component locator .
Partial A6--Sweep circuit board
component locator (SNB090000and up) .
Table
No .
Fig .
No .
8-21
8-22
8-23
8-24
8-25
Page
Partial A6---Sweep circuit board
component locator (SN B089999and
below) .
Partial A6--Sweep circuit board
component
locator
(SN B090000and up) .
Location of adjustments in the
7B53A/7B53AN (SN B209999 and below) .
Location of adjustments in the 7B53A
(SNB210000and up) .
Location of adjustments in the
7B53A/7B53AN .
C? JUN 1980
1-1
Electrical .......................
1-1
1-2
Environmental ................... 1-6
1-3 Physical .......................
1-6
2-1 Deflection
Factor of the X Signal ...... 2-13
2-2 Risetime Measurements
............ 2-16
4-1
Test Equipment . ................. 4-3
4-2 Main
Sweep Timing . .......
. . .....
4-13
4-3 Delayed
Sweep Timing . . . .......... 4-14
4-4 Main Sweep Magnifier
Accuracy . . . . . . 4-15
4-5
Delayed Sweep Magnifier Accuracy
.... 4-15
5-1 Relative
Susceptibility to Static Discharge
Damage ........................
5-2

POWER SOURCE
REV JAN
1985
The
general safety information in this
part of the summary
is for both operating
and servicing personnel . Specific
warnings and
cautions will be found
throughout the manual
where they apply, but may
not appear in this summary .
IN THIS MANUAL
CAUTION statements identify conditions
or practices that
could result in damage
to the equipment or other property .
WARNING statements identify conditions
or practices that
could result in personal
injury or loss of life .
AS MARKED
ON EQUIPMENT
CAUTION indicates
a personal injury hazard
not immediately
accessible as one reads the
marking, or a hazard to
property including the
equipment itself .
DANGER indicates a personal
injury hazard immediately
accessible
as one reads the marking .
IN THIS
MANUAL
Static-Sensitive Devices
.
This symbol
indicates where applicable
cautionary or other information
is to be found .
AS MARKED ON EQUIPMENT
DANGER----High
voltage .
Protective ground
(earth) terminal .
ATTENTION-----refer
to manual .
GROUNDING THE
PRODUCT
TERMS
SYMBOLS
WARNINGS
This
product is intended to
operate in a mainframe
connected to a power
source that will not apply more than
250 volts
rms between
the supply conductors
or between either
supply conductor and
ground . A protective ground connection by
way of
the grounding conductor in
the mainframe power
cord is essential for
safe operation .
This
product is grounded through
the grounding conductor
of the
mainframe power cord . To avoid electrical
shock, plug
the
mainframe power cord into a
properly wired receptacle
before
connecting to the product input or output
terminals . A
protective ground connection by
way of the grounding conductor
in the
mainframe power cord is essential for
safe
operation .

7B53A/7B53AN
DANGER ARISING FROM
LOSS OF GROUND
Upon loss of the protective-ground connection, all
accessible conductive parts (including knobs and controls that may
appear to be insulating), can render an electric
shock .
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES
To avoid explosion, do not operate this product in an
atmosphere of explosive gases unless it has been specifically
certified for such operation .
DO
NOT
OPERATE PLUG-IN UNIT WITHOUT COVERS
To avoid personal injury, do not operate this product
without covers or panels installed . Do not apply power to the plug-in
unit via a plug-in extender .

POWER SOURCE
@ JUN 1980
VICIN
DO NOT SERVICE ALONE
FOR
QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding
Operators Safety Summary
Do not perform internal service or adjustment of this
product unless another person capable of rendering first aid and
resuscitation is present .
USE CARE WHEN
SERVICING WITH POWER ON
Dangerous voltages exist at several points in this
product . To avoid personal injury, do not touch exposed
connections
and components while power is on .
Disconnect power before removing protective panels,
soldering, or replacing components .
711353A/711353AN
This product is intended to operate in a mainframe
connected to a power source that will not apply more than 250 volts
rms between the supply
conductors or between either supply
conductor and ground . A protective ground connection by
way of the grounding
conductor in the mainframe power cord is
essential for safe operation .

The 7B53A/7B53AN Dual Time Base .

Characteristics
MAIN
SWEEP
Sweep Rates
Over Center Eight
Divisions
50
ms/div to 0 .5 ps/div
0 .2 ps/div
to 0 .05 ps/div
Over any 2 div
portion within
center
eight div (all sweep
rates)
Variable
Sweep Rates
REVD JUN
1980
Table 1-1
NO TE
The 7B53A
and 7S53AN are
electrically identical
except that only the
7853A is compatible with
the
alphanumeric readout
system provided for
the 7000-series
oscilloscopes .
This instrument will
meet the electrical
characteristics listed under
Performance
Requirement in Table 1-1,
following
complete calibration . The following
electrical characteristics
apply over an
ambient temperature
range of 0° C to
+50 0 C,
except as otherwise
indicated .
Warmup time for given accuracy
is 20 minutes .
ELECTRICAL
Performance Requirement
0 .05 ps/div
to 5 s/div in
25 calibrated
Measured in
7000-Series Oscilloscopes
.
+15'C to ~I-35°
C___

0° C to '4-50°
C
Unmag
Me9
unmag
Meg .
3% 4%
Within
Within
4%
5%
Within
7%
Continuously
variable between
cali-
brated sweep
rates . Extends sweep
rate
to at least 12 .5 s/div .
Supplemental
Information
Variable
to at least 2 .5 :1 .
VARIABLE
control
internally switchable between
variable main
sweep rates, variable
delayed sweep rates,
and variable
main
sweep holdoff .
Hold-off time
may be varied at
least
2 :1
by front-panel
VARIABLE control
when
Variable Selector
connector
(P140) is
connected for variable
holdoff .
Section 1---7B53A/7B53AN

Specification----7B53A/7B53AN
DELAYED SWEEP
Sweep Rates~~
Sweep
Accuracy
Over Center 8 Divisions
50 ms/div to 0 .5 ps/div
0 .5 s/div to
0 .1 s/div and
0 .2 us/div to 0 . .05 ,us/div
Over
any 2 div portion within
center
eight div (all sweep
rates)
Variable Sweep
Rate
MIXED SWEEP, VARIABLE
TIME DELAY
Main Sweep
Characteristics
Delayed Sweep
T Variable Time Delay
Mixed Sweep Accuracy
Delay Time Range
Differential Delay Time
Measurement
Accuracy
(-f-15° C to +35° C)
5 s/div to
1 s/div
0 .5 s/div to 1 ,us/div
Delay Time Jitter at
1 ms/div
Table 1-1 (cont)
Performance Requirement
~

Supplemental Information
0 .05 ps/div to .5
s/div in 22 calibrated `
steps
.
Measured in 7000-Series Oscilloscopes
.
+15°C to
+35°C
Unmag

Ma g
.- Within

Within
3% 3 .5%
Within Within Within
4% 4 .5% 5% 6%
Within

Within
6%

8%
Continuously variable
between
calibrated sweep
rates .
Within 2% plus
main sweep error .
Unchanged .
0° C to +50° C
0 to 10 times DLY TIME/DIV
settings from 5 s/div to 1 ps/div
.
Within 1 .4% of measurement plus
0 .3% of full scale .
Within 0 .7% of measurement plus
0.3% of full scale .
Less than
1 part in 20,000 of 10X
the TI M E/DI V setting .
Exclude the first and beyond
the 9th
division of
the unmagnified sweep when
measuring magnified or unmagnified
accuracy .
Extends sweep rate to at least
1 .25 s/div . Variable to at
least
2 .5 :1
. VARIABLE control switchable
between variable main sweep rates,
variable delayed sweep rates, and
variable main sweep
holdoff .
Exclude the following portions
of
the mixed
sweep :
First 0 .5 div after start of main
sweep display and 0 .2 div or
0 .1 us
(whichever is
greater) after transition
of
main to delayed sweep .
Full scale is 10 times the TIME/DIV
OR DLY TIME setting . Accuracy applies
over the center eight major
DELAY TIME
MULT dial divisions .
REVA JUN 1980

Deflection Factor
Characteristics
EX7, K4AGX1
EXT~11 K4AGX1
Nominal
Frequency Response
AC HFREJ
DC
REVJAN 1985
10mV/divwithin 10%
.
100mV/divwithin 10% .
1 v/div
within 10% .
-- ------ -
---------- - --- ----------
System -3 dB points
in 7000-Series
Oscilloscope .
Lower-3 d8
40 Hz
16 kHz
40 Hz
Table 1-1 (cont)
~

Upper-3 dB
2K4Mz
MiMmurn Trigger
Signal Required
!NT'
EXT
(div)
~ {mvq
80 Hz to
10 MHz
1OK4Hzto
100 MHz
_____
80hHzto
10 MHz
150 kHz
10 MHz
10 MHz
to 10UK4Hz
30 Hz to
50 kHz
do to
10 MHz
10MHzto
50 MHz
100
50
50
100
50
Specification--7B53A/7853AN
Supplemental Information
Triggering signal
amplitude require-
ments increased 10 times
for
EXT+
10oporabon .

Characteristics
External Trigger Input
Input RondO
Maximum Safe Input Voltage
Level Range
EXT0 10
Internal Trigger Jitter
Maximum Safe Input
Voltage (DLY'D TRIG
SOURCE
set
to EXT)
!n ut Rang C
Love! Range
Internal Trigger
Jitter
Table 1-1 (cont)
PerformanceRequirement
At least + and --- 15 V .
1namless
at 75 MHz .
1noovless at 75 MHz .
Supplemental Information
Approximately 1 M0 paralleled by
0}pF
500V(dc - 1 Peak
ac) . 500Vpeak-
to-peak ac at 1
kHz
or
less
.
500V(dof peak ac) . 500Vpeak-
to-peak aoat 1 kHz or less .
REVA JUN
1980

Characteristics
OUTPUT SIGNALS
Delayed Sweep Gate
Maximum Safe Input
Voltage
Wave shape
Amplitude
Output Resistance
Loading
Polarity
Duration
Sweep Gate
Duration
Duration
JUN 1980
DISPLAY MODE
INTEN, DLY'D
SWP
MIXED
MIXED
Main
Sweep Gate
DISPLAY
MODE
MAIN SWEEP, INTEN
DLY'D
SWP
Rectangular
pulse .
->3 .0 V with baseline at --0 .2
to --1 V when loaded by at least 10 K2 .
0 .475 with
baseline at 0 to
--0 .2 V when loaded
by50 0 .
Table 1-1 (cont)
PerformanceRequirement
Positive-going
.
For the time
that the delayed sweep runs .
Composite gate signal with timing
de-
termined by the setting of the TIME/
DIV OR
DLY TIME switch during the
main sweep portion
of the display,
and by the setting of the DLY'D
'Time/
Division switch during the delayed
sweep portion of the display .
Refer to associated
oscilloscope manual .
Coincident with the main sweep
interval .
Coincident with
the main sweep inter-

~,
val .
Coincident with the main sweep interval
plus the delayed
sweep interval .
Refer to associated oscilloscope
manual .
Coincident with the
main sweep (all
Display Modes) .
Specification--7 353A/71353AN
Supplemental
Information
+10 V (dc
I-
Peak ac) . 20
V peak-
to-peak ac at 1 kHz or less .
Available at front-panel
DLY'D
TRIG
IN connector when
operating in the INTEN,
DLY'D
SWP, or MIXED
Display Modes .
The
DLY'DTRIG SOURCE
switch
must be set
to I NT and P613 must
be connected for
Delayed Sweep
Gate Out .
Approximately
350 n .
At
least 10 kQ shunted by 100 pF
or less .

Specification---7B53A/7B53AN
Characteristics
Sawtooth
Waveshape
Duration
DISPLAY MO DE
MAIN SWP, INTEN
DLY'D SWP
MIXED
Characteristics
Size m ~
Weight
Refer
to
associated oscilloscope manual .
Sawtooth signal with slope determined
by setting of the TIME/DIV OR
DLY
`TIME switch .
Table
1-1 (cont)
PerformanceRequirement
Sawtooth
signal with slope determined
by the setting of the DLY'D
Time/
Division
switch .
Composite sawtooth - signal
A with slope ~~
determined
by the setting of the
TIME/DIV OR DLY TIME switch during
the main sweep portion of
display, and
by the setting of
the DLY'D - time/
Division switch during the delayed
sweep portion of display .
Coincident with the time
that each
sweep is displayed .
'For Internal
Triggering only, the specified --3 dB
frequency of the vertical system replaces any
frequencies in the above table
when the number in the table is greater
than the --3 dB frequency of the vertical system .
Table 1-2
ENVIRONMENTAL
Refer to the Specification for the associated
oscilloscope .
Table
1-3
3 .3 Ibs (1 .5 kg) .
Supplemental Information
PHYSICAL _ _
_ I?___ ._
Fits all7000-series
plug-in compartments .
_ .__ ._ ._ ._ ._ ._ .__

_
_
@ JUN 1980

7B53A/7B53AN FeaturesGeneralInstallation
REV B JUN 1980
The 7B53A and 7B53AN
Dual Time Base units provide
Main, Intensified,
Delayed, and Mixed sweep operation for
`TEKTRONIX 7000-Series Oscilloscopes . Calibrated
sweep rates from 5 s/div to 50 ns/div (5 ns with X10
magnification) and triggering to 100
MHz are provided .
The 7B53A
and 7B53AN are electrically identical except
that only the 7B53A is compatible with the
alphanumeric
readout system provided for
7000-Series Oscilloscopes .
Other features include 0 to 10 times continuous
sweep
delay, variable main and delayed sweep
rates, and variable
main sweep holdoff .
Separate triggering controls are
provided for main
and delayed sweep triggering, and
when operating in the AUTO MAIN TRIGGERING MODE,
a bright base line is displayed in
the absence of a trigger
signal . The 7B53A/7B53AN
can also be used as an
amplifier
for X-Y operation .
The 7B53A/7B53AN operates with a TEKTRONIX 7000-
Series Oscilloscope and a 7A-Series
Amplifier unit toform
a complete oscilloscope
system . 'To effectively use the
7B53A/7B53AN, its operation and capabilities should be
known . 'This section explains the operation of the front-
panel controls and
connectors, provides an Operating
Checkout
procedure, gives general operating informa-
tion, and describes basic applications for this instrument .
The 7B53A/7B53AN is designed to operate in
the
horizontal compartment of the
indicator oscilloscope .
This instrument can also be
i nstalled i nthe Vertical plug-in
compartment to provide a sweep that runs vertically on the
crt . However, when used in this manner, there are no
retrace blanking or internal triggering provisions, and
the
unit may not meet the specifications given
in
Section
1 .
The instructions in this
manual are written for use of the
7B53A/7B53AN in the horizontal plug-in compartment .
Before proceeding with installation it is necessary to
check the internal connections of the
Variable Selector
connectorand
the Delayed Sweep Gate Out connector .
These connections should be checked against those
shown in Fig . 4-1 by qualified service personnel
.
Section 2-71353A/71353AN
To
install the 7B53A/7B53AN in a plug-in
compart-
ment, push it in until it fits
firmly into the compartment .
The front panel of the 7B53A/7B53AN
should be fl ush with
the front panel of the
indicator oscilloscope . Even though
the gain of the
indicator oscilloscope is standardized to
minimize adjustment when inserting plug-in
units, the
sweep calibration of the 7B53A/7B53AN
should becheck-
ed when installed . The procedure for
checking the unit is
given under Sweep Calibration
i nthe O perati ng Checkout
procedure in this section .
To remove
the 7B53A/7B53AN, pull the release latch
(see
Fig . 2-1) to disengage the unit from the indicator
oscilloscope and pull it out of the plug-in
compartment .
General
Fig . 2-1 . Location of release
latch .
CONTROLS AND CONNECTORS
All controls required
for the operation of the
7B53A/7B53AN, except the Variable Selector and
the
Dly'd Sweep Gate Out connector are located on the
front
panel of the instrument . To
make full use of the
capabilities of this
instrument, the operator should be
familiar with the function
and use of each control . A brief
description of
the front-panel controls and connectors is
given here . More detailed information is
given under

Operating Instructions---7B53A/7B53AN
General Operating Information . Fig . 2-2 shows the front
panel and external controls and connectors of the
7B53A/7B53AN
.
1 . Main Triggering Controls
LEVEL .
Selects
the amplitude point on the trigger
signal where sweep triggering occurs .
SLOPE . Two-position switch permits triggering on the
positive-going or negative-going portion of the main
triggering signal .
TRIG'D . Light indicates that the main sweep is
triggered and will produce a display .
MODE . Pushbutton switches select theoperating mode
for the main triggering circuits .
2-2
MAIN
TRIGGERING
CONTROLS
Fig . 2-2 . Front-panel controls and connectors .
COUPLING . Pushbutton switches select the method of
coupling the triggering
signal to the main triggering
circuits .
SOURCE
. Pushbutton switches select the source of the
main triggering signal .
2 . Sweep Controls
TIME/DIV OR DLY TIME . Selects the sweep rate of the
main sweep generator (see Fig . 2-5) .
DLY'D Time/Division . Selects the sweep rate of the
delayed sweep generator and selects the
MAIN SWP,
INTEN, and DLY'D SWP Display Modes (see Fig . 2-5) .
VARIABLE . Provides continuously
variable main
sweep rates, continuously variable delayed sweep rates,
MAIN
e R1G G'^ING
AMPLWIER
COIIPLtNG soa :~Pe
AC
INPUT/OUTPUT
CONNECTORS
REV C JUN 1980

or variable main sweep holdoff ;
depending on the setting
of the Variable Selector multi-pin connector (P140) . The
VARIABLE control also selects the MIXED Display Mode
(see Fig . 2-5) .
SW P CAL . Screwdriver adjustment to match the gain
of
the 7B53A/7B53AN to the indicator oscilloscope for
calibrated sweep rates .
POSITION . Controls horizontal position of display .
FINE . Provides precise control of horizontal position
adjustment .
MAG . Pushbutton
switch selects X1 or X10 horizontal
magnification .
3 . Delay Time Control
DELAY
TIME MULT . Provides variable sweep delay
between 0
.00
and
10 .0 times the delay time indicated by
the TIME/DIV OR IDLY TIME switch .
4 . Delayed "Triggering Controls
LEVEL . Selects the RUNS AFTER DLY TIME or
Triggerable After Dly Time Modes, and the amplitude
point at which the delayed sweep is triggered .
SLOPE . Two-position switch permits triggering
on the
positive-going or negative-going portion of the delayed
triggering signal
.
COUPLING . Two-position switch selects the method of
coupling the triggering signal to the delayed triggering
circuits
.
SOURCE . Two-position switch to select the source of
the delayed triggering signal .
5 . Input/Output Connectors
MAIN TRIG IN OR AMP IN . Front-panel bnc connector
serving
as an external trigger input for the maintriggering
circuit or as an external horizontal input, depending
upon
the setting of the TIME/DIV OR DLY TIME switch and the
MAIN TRIGGERING
SOURCE switch .
DLY'D
TRIG IN . Front-panel bnc connector serving as
an external trigger input
forthedelayed triggering circuits
or as a delayed sweep gate output ; depending upon the
DLY'D TRIG SOURCE switch, the position of P613, and
the
DISPLAY MODE .
REV C JUN
1980
Introduction
SetupProcedure
Operating
Instructions--71353A/7B53AN
RATING CHECKOUT
The following procedure checks the basic operation of
the 7B53A/7B53AN . It may also be used for familiarization
with this instrument or as an incoming inspection . This
procedure is divided into two parts, Sweep Control
Functions, and Main and Delayed Triggering Functions . A
complete operating check of the 7B53A/7B53AN control
functions can be made by performing both parts, or each
part may be performed separately .
NOTE
For optimum performance, the 7B53A/7B53AN
should be installed in an oscilloscope system with
similar frequency and sweep rate
capabilities .
1 . Install the 7B53A/7B53AN in the right horizontal
compartment of the indicator oscilloscope .
2 . Install a Vertical Amplifier unit in the left vertical
compartment .
3 .

Turnon
the indicator oscilloscope and allow at least
20 minutes warmup .
4
.
Set the 7B53A/7B53AN controls as follows :
MAIN TRIGGERING
SLOPE

(-f-)
MODE
AUTO
COUPLING AC
SOURCE INT
DLY'D TRIG
LEVEL

RUNS AFTER DLY
TIME
(fully clockwise)
SLOPE

(+)
COUPLING AC
SOURCE INT
Sweep
Controls
POSITION Midrange
MAG

X1-IN
TIME/DIV OR DLY TIME 1 ms
DLY'D Time/Division

1 ms
VARIABLE

CAL (fully clockwise)
Variable Selector

Main Variable
DELAY TIME MULT

1 .00
5 .

Set the
indicator oscilloscope to display the plug-in
units and adjust for a well defined
display . See indicator
2- 3

Operating Instructions--7B53A/71353AN
oscilloscope and vertical unit
instruction manuals for
detailed operating instructions .
Sweep Control Functions
The following procedurechecks
the operation of the
sweep controls and checks the
Display Modes .
Normal Sweep
2 . To select the MAIN SWP Display Mode, press in the
DLY'D Time/Division knob, and set the TIM
E/DIV OR IDLY
TIME switch and
the DLY'D Time/Division switch to the
same sweep
rate (1 ms) .
3 .
Connect the 1 kHz calibrator signal from the in-
dicator oscilloscope to the vertical amplifier unit Input
.
Adj ust the Calibrator and the vertical Volts/Division
switch
for four divisions of display .
4 . Rotate the MAIN TRIGGERING LEVEL control for a
stable MAIN SWP display (non-delayed)
. Rotate the
DELAY
TIME MULT dial and note that it has no effect on
the display .
5 . Rotate the
POSITION control and note that it
horizontally positions the trace . Rotate the FINE control
and note that it provides precise horizontal
positioning .
Disconnect the calibrator
signal .
Sweep Calibration
1 .

Perform steps 1 through 5 of the Setup
Procedure .
NOTE
The Time/Division switch selects main sweep rates,
delayed sweep rates, and Display Modes (MAIN
SWP, INTEN, DLY'D SWP, and MIXED) .
Refer to
Selecting
Sweep Rates and Display Modes dis-
cussions in the General Operating Instructions for
further information .
NOTE
For accurate sweep
timing,
apply
a signal of known
frequency
or time period (time-mark signal,
calibrator square wave, 60 Hz line etc .) to the
associated vertical amplifier unit and adjust the
TIME/DIV OR DLY TIME
switch
and
the SWP CAL
control to calibrate the signal to the oscilloscope
graticule . Be sure that the sweep timing signal is
accurate within 0 .5% . The following sweep calibra-
tion procedure uses a TEKTRONIX Time-Mark
Generator .
6 . Connect a 1 ms time-mark
signal from the Time-
Mark
Generator with a 50 f2 bnc coaxial cable with bnc
connectors and 50 S2 bnc termination to the Input of the
associated vertical unit . Adjust
the vertical Volts/Div
switch for about four divisions of display and rotate the
MAIN 'TRIGGERING LEVEL control
for a stable display .
Check the crt display for one
complete time--mark per
division
(position as necessary) . If necessary, adjust the
SWP CAL screwdriver adjustment for one complete time-
mark per division over
the center eight divisions of display .
Disconnect the Time-Mark Generator .
Intensified, Delayed, and Mixed Sweep
7 .

Reconnect the oscilloscope Calibrator signal to the
vertical unit and adjust for about four divisions of vertical
display . Pull outthe DLY'D
Time/Division knob and rotate
clockwise
to
.1 ms/div for the INTEN Display Mode
(TIME/DIV OR IDLY TIME switch remains at 1 ms/div)
.
Note that a delaying sweep with an intensified portion
(delayed sweep) is displayed on the crt (the
oscilloscope
Intensity may need to
be varied to view the intensified
display) .
8
.
Rotate the
DELAY TIME MULT dial and notethatthe
amount of delay time before the intensified portion of
display is controlled by the DELAY
TIME MULT dial .
9 . Rotate the VARIABLE control counterclockwise out
of switch detent and note that the sweep rate indicated
by
the TIME/DIV OR DLY TIME
switch can be varied to at
least the sweep rate of
the next adjacent position
(2 ms/div) . The internal Variable Selector connector must
be set for variable main sweep rates . Return
the
VARIABLE control to
the CAL position .
10 .

Press the DLY'D Time/Division switch to the
inner
position for the DLY'D
SWP Display Mode . Note the
magnified
display with sweep rate determined by the
DLY'D Time/Division switch . The oscilloscope
Intensity
may need to be increased to
view the delayed sweep
display .
11 .

Pull out the
VARIABLE Time/Division knob for the
MIXED Display Mode (MIXED Display Mode can be
selected when operating in the DLY'D SWP Display Mode
only) . Note that the main sweep is displayed at a rate
determined by
the TIME/DIV OR DLY TIME switch
followed by a delayed sweep display at the rate deter-
mined by the DLY'D rime/Division switch . Rotate the
DELAY TIME MULT dial and note that the amount of
display allocated to each sweep is determined by the
DELAY TIME MULT dial .
REV
C JUN 1980

Main and Delayed Sweep Triggering Functions
The
following procedure checks the operation of the
mainand delayed triggering
controls :
Partial Procedure . To begin theOperating Checkout
with triggering, perform steps 1 through 5 of the Setup
Procedure
provided at the beginning of the Operating
Checkout
.
Connect the 1 kHz calibrator signal from the
indicator oscilloscope
to
the
vertical unit Input and adjust
for about four divisions of vertical display .
12 . Set the TIME/DIV
OR
DLY
TIME switch and the
DLY'D Time/Division switch to 1 ms and press in the
DLY'D Time/Division switch
and the Variable control .
CHECK--that a stable display can be obtained with
the
COUPLING switch for MAIN TRIGGERING settoAC,
AC
HF REJ, and
DC
for
both the positive and negative
positions of the SLOPE switch (MAIN
TRIGGERING
LEVEL control may be adjusted as necessary to obtain a
stable
main sweep display) . Remove all connectionsfrom
the oscilloscope
system .
13 .
Connecta 60 Hz signal (line voltage, etc .) with a
50
0
cable or voltage probe to the vertical unit Input and
adjust the Volts/Div
switch for about four divisions of
display . Set the MAIN TRIGGERING
COUPLING switch
to AC LFREJand setthe "I"IME/DIV OR DLY TIME switch
to 10 ms .
Rotate the MAIN TRIGGERING LEVEL control
throughout its range
and check that a stable display
cannot be obtained (TRIG'D light off) .
14 . Change the MAIN TRIGGERING
SOURCE switch
to LINEand the COUPLING switchto AC . Check that
a
stable mainsweep
display can be obtained with the MAIN
TRIGGERING COUPLING switch set
to AC, AC HF REJ,
and DC (MAIN TRIGGERING LEVEL control may be
adjusted as necessary)
.
Remove all connectionsfrom the
oscilloscope system .
15 . Connect the
indicator oscilloscope Calibrator
signal to the vertical unit Input
connector and to the MAI N
TRIG IN connector . Set the Calibrator
for a 0 .4 V, 1 kHz
signal and adjust the vertical unit Volts/Div switch
for
about four divisions of display . Set the TIME/DIV OR DLY
TIME switch and the
DLY'D "Time/Division switch to 1 ms .
Set the MAIN
TRIGGERING SOURCE switch to EXT and
check that a stable display can be obtained
with the
COUPLING switch for MAIN TRIGGERING set to AC,
AC
HF REJ, and DC,
for both the positive and negative
positions of the SLOPE switch
(MAIN TRIGGERING
LEVEL control may be adjusted as necessary
for a stable
display) .
16 . Change the MAIN TRIGGERING SOURCE switch
to EXT - 10 . Set the
oscilloscope Calibrator for 4 V at
1 kHz and adjust the vertical unit Volts/Div
switch for
REV A
JUN 1980
Operating Instructions---7B53A/71353AN
about 4 divisions of display . Check that a stable display
can be obtained with the
COUPLING switch for MAIN
_TRIGGERING settoAC, AC HF REJ, andDC, for boththe
positive and negative positions of the SLOPE switch
(MAIN
TRIGGERING LEVEL control may be adjusted as
necessary to obtain a stable delaying
sweep display) .
Remove the Calibrator signal from the MAIN TRIG IN
connector .
17 . Set the MAIN'TRIGGERING COUPLING switch
to
AC and the SOURCE switch to INT . Adjust the MAIN
TRIGGERING
LEVEL control for a stable display . Set the
MODE switch
to NORM and check for a stable display .
Change the MODE switch to AUTO and adjust the
LEVEL
control
for a free-running display . Change the MODE
switch to NORM and
check for no display .
18 . Adjust the MAIN TRIGGERING LEVEL control for
a stable display . Change
the MAIN TRIGGERING MODE
switch
to SINGLE SWP
.
Press the RESET button and
check for one sweep . Remove the 1
kHz signal from the
vertical unit
and press the RESET button . CHECK for no
display and that the READY light
is on . Connect the 1 kHz
signal to the vertical unit and check for
one sweep as the
signal is applied .
19 . Set the MAIN TRIGGERING MODE switch
to
AUTO . With the TIME/DIV OR DLY TIME switch at 1 ms,
pull out the DLY'D
Time/Division switch and rotate to
.2 ms (Intensified Display
Mode) . Rotate the MAIN
TRIGGERING LEVEL control for a stable
display
(oscilloscope Intensity may need to be varied to view the
intensified display) . Rotate the DELAY TIME MULT dial
and
note
that the
intensified portion of display is con-
tinuously variable .
20
.
Rotate the DLY'D TRIG LEVEL control counter-
clockwise out
of switch detent for a triggered delayed
sweep . With the DLY'D TRIG SLOPE, COUPLING,
and
SOURCE switches
set to (-i-), AC,andINT ; rotate the
DLY'D TRIG LEVEL control for
a stable intensified portion
of display . Rotate the DELAY TIME MULT dial and
note
that the
intensified portion of display does not start at the
completion of the delay
time (determined by the settings
of the "TIME/DIV OR DLY TIME switch andthe
DELAY
TIME MULT dial), but waits for the next trigger pulse .
21 . Press the DLY'D Time/Division switch
in for the
DLY'D
SWP Display Mode . Rotate the DLY'DTRIG LEVEL
control for a stable
delayed sweep display (oscilloscope
Intensity may need
to be varied) . Check that a stable
delayed sweep display can be obtained
with the DLY'D
TRIG COUPLING switch set to AC and
DC for both -+-and
positions of the SLOPE switch (DLY'D TRIG LEVEL
control maybe
adjusted as necessary for a stable delayed
sweep display) .
2-5