Tektronix 7B53A User manual

Tektronix, Inc.
070-1252-00
TEKTRONIX®
INSTRUCTION MANUAL
P.O. Box 500
Beaverton, Oregon 97005
772

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7B53A/7B53AN Operators
TABLE OF CONTENTS
Page Page
SECTION I OPERATING INSTRUCTIONS SECTION I OPERATING INSTRUCTIONS (cont)
7B53A/7B53AN Features
1-1 Applications 1-15
General
1-1 General 1-15
Installation
1-1 Comparison Measurement
Controls and Connectors 1-3 Techniques 1-15
Main Triggering Controls 1-3
Time Duration Measurements 1-16
Sweep Controls 1-4 Determining Frequency 1-16
Delay
Time Control 1-4 Risetime Measurements 1-17
Delayed Triggering Controls 1-4 Delayed Sweep Measurements 1-18
I
nput/Output Connectors 1-4 Delayed Sweep Magnification 1-18
Operating
Checkout 1-4 Triggered Delayed Sweep
Introduction
1-4 Magnification 1-20
Setup Procedure 1-4 Displaying Complex Signals
Sweep
Control Functions 1-5 Using Delayed Sweep 1-20
Sweep Calibration (front-panel) 1-5 Pulse
Jitter Measurements 1-21
Main and Delayed Triggering
Functions 1-6 SECTION
II SPECI FICATlON
General Operating Instructions 1-7
Pushbutton Switch Logic 1-7 Table 2-1, Electrical
2-1
Triggered Light 1-7 Main Sweep
2-1
Main Trigger Mode 1-7 Delayed Sweep
2-1
Main Triggering Coupling 1-8 Mixed Sweep, Variable Time Delay 2-2
Main Triggering Source 1-9 Amplifier 2-2
Trigger Slope 1-9 Main Triggering 2-3
Trigger Level 1-11 Delayed Triggering 2-4
Selecting Sweep Rates 1-11
Output Signals 2-4
Time Measurement 1-12 Table 2-2, Environmental 2-5
Sweep Magnifier 1-12 Table 2-3, Physical 2-5
Display Modes 1-13
Delay
Time Multiplier 1-13 NOTE
Delayed Sweep Triggering 1-14
Input/Output Connectors 1-14 Refer to the
1853A/1853AN Service Manual for circuit
X-V Operation 1-14 description, maintenance, calibration, diagrams, and parts
Mainframe Operating Modes 1-15 replacement information.
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Section 1- 7B53A /7B53AN
OPERATING INSTRUCTIONS
7B53A/7B53AN F ea tures
T he 7853A and 7853AN Dual Time Base units provide
Main, Intensified, Delayed, and Mixed sweep operation for
TEKTRONIX 700 0·$eries Oscilloscopes. Calibrated sweep
rates trom 5 s/ DIV to 50 ns/DIV (5 nanoseconds wi th X10
magnification) and triggering to 1 00 megahertz are
provided. The 7853A and 7853AN are electrica lly identical
except t hat only the 7B53A is compatible with th e
alphanumeric readout system provided for 7000-Seri es
Oscilloscopes.
Other features include 0
to 10 times continuous sweep
delay. va riable main and delayed sweep rates, and variable
main sweep hold off. Separate triggering controls are
provided for main and delayed sweep triggering, and w hen
operating in the A UTO MAIN TRI GGERING MODE, a
bright base line is displayed in the absence of a trigger
- r.. signal. The 7853A/7B53AN can also be used as an a mplifier
for X-V opera tion .
General
Th e 7853A/7853AN operates with a TEKTRONIX
7000·Series Oscilloscope and a 7A·Series Ampl if ier unit to
form a complete o sci lloscope system. To effectively use the
7853A/7853AN its operation and capab ili ties sh o uld be
known . Thi s section describes the operation of the front ·
panel controls
and co nnector s, provides an Operating
Checkout procedure, gives
gene ra l operating information,
and basic applications for this instrument.
Installa tion
The 7853A/7853A N is designed to operate in the
horizontal compartme
nt of the indicator oscilloscope. This
instrument can also be installed in the
Ve rt ical plug·in
compartment to pr ovide a sweep that runs vertically on the
CRT. However. when
used in this manner, there are no
retra
ce blanking or internal triggering provisions. and the
unit may n ot meet the specifications given in Section 2.
The instructions in this manual
are w ritten for use of the
7B53A/7853AN in the horizontal pl ug -in compartment.
®
Befo re proceeding with installation it is necessary to
check the settings of the Variable Selector multi -pin
co nne ctor (p 140) and the Delayed Sweep Ga te Out
multi · pin connector (P613). T he Variable Selector multi -
pin connector (P140) determines whether the fr o nt ·panel
VAR I ABLE control varies main sweep rates, delayed sweep
rate
s, or main sweep holdoff ; the De layed Sweep) Gate Out
multi ·pin connector (P6t3) determines whether the
Delayed Sweep Gate Out signal is connect ed to t he
front ·panel DLY' D TRIG IN connector (see Fig. 1-3). Refer
to General Operating Instructions in th is section for
VAR I ABLE co ntrol and OLY'D GA TE OUT in form ation.
To install the 7B53A/7853AN in a plug-in compart·
ment. push it in until it fits fi r mly into the compartment.
The
Iront panel of the 7B53A/7853AN sh ould be flush
w ith the front panel of the indicator oscilloscope. E ve n
th ough the gain 01 the indicator oscilloscope is stand ar dized
to minimize adjustment when inserting plug·in uni
ts , the
sweep calibration of the
7B53A/7B53AN should be
checked wh
en installed. The procedure f or checking the
unit is given under Sweep Calibration in the Operating
Checkout procedure in this
sect ion .
To remove the
7B53A/7B53AN, pull the release latch
(see Fig. 1-2) to disengage the unit from the indicator
oscilloscope and pull it out of the plug·in compartment.
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L ATCH \: ....
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Operating In st ructions-7B53AnB53AN Ope raton
VariatMe Selector Connector
(P 140 )
Delayed Gate Out Connector
(P6 13)
IPfi13)
• Aight Side
01 Instrument
Variable OeI'Yed
S-.p R,,"
--;it;r- ______Va riabl. Main
, SWHp Rates
Variable Main
S_pHoidoH
Left Side
Olln$lrument
Fig. 1·3. L ~ " on 01 Del. yed G." Ou t Ind V.dable Se lect or mult i-pin connle,on .
REV. APR 1974
1·2
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Date: 2008.11.17 05:42:52 -06'00'

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MAIN
TRIGGERING
CONTROLS
SWEEP
CONTROLS
DELAY
TIME
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Operating Instructions- 7B53AnB53AN Operators
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INPUT/OUTPUT
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F ig. 1-4. FrOnl..., an .. eonlrolland connec l or •.
CONTROLS ANO CONNECTORS
General
All controls required for the operation of the 7853A/
7B53AN, except the Variable Select or and the Dly'd Sweep
Gate Out connector (see F ig. 1·31. are located on the fr ont
panel of the instrument. To make full use of the capabilit ies
of this instrument, the operator should be familiar with the
function and use of each control. A brief description of the
front-panel co ntr ols and connec tor s is g ive n here. More
detailed information
is given under General Operating
Inf
orma tion. Fig. 1-4 shOVol$ the front panel and exter nal
controls and connectors of the 7B53A/7B53AN.
1. Main Triggering Controls
LE VEL. Selects the amplitude point on the trigger signal
where sweep triggering occurs.
®
SLO PE . T wo -position swi tch permits triggering on the
positive-going or negative-going por tion of the main trig.
gering s
ign al.
TR IG'D. Lighl indicates that the main sweep
is triggered
and will produce a display.
MODE . Pushbutton switches select the operati ng mode
for the main triggering circuit
s.
CO UPLING. Pushbutton switches select the method of
coupling the triggering signal to the main triggering circuits.
SOURCE. Pushbutton switches se l ect the source of the
main triggering
sig nal.
' ·3

Operating Instructions-7853A/7853AN Operators
2. Sweep Controls
TIM E/DIV OR DL Y TIM E. Selects the sweep rate of the
main sweep generator (see Fig. 1-7).
DL Y'D Time/Division. Selects the sweep rate of the
delayed sweep generator and selects the MAl N SWP,
INTEN, and DLY'D SWP Display Modes (see Fig. 1-7).
VARIABLE. Provides continuously variable main sweep
rates,
continuously variable delayed sweep rates, or variable
main sweep
holdoff; depending on the setting of the
Variable Selector multi-pin connector (P140). The VARI-
ABLE control also selects the MIXED Display Mode (see
Fig. 1-3, Fig. 1-7).
SWP CAL. Screwdriver adjustment to match the gain of
the 7 B53A/7B53AN to the ind icator oscilloscope for
calibrated sweep rates.
POSITION. Controls horizontal position of display.
FI N E. Provides precise control of horizontal position
adjustment.
MAG. Pushbutton switch selects X 1 or X 10 horizontal
magnification.
3. Delay Time Control
DELAY TIME MUL T. Provides variable sweep delay
between
0.00 and 10.0 times the delay time indicated by
the TIME/DIV OR DLY TIME switch.
4. Delayed Triggering Controls
LEVEL. Selects the RUNS AFTER DLY TIME or
Triggerable After Diy 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.
1-4
5. Input/Output Connectors
MAIN TRIG IN OR AMP IN. Front-panel BNC connec-
tor serving as an external trigger input for the main
triggering 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.
DL Y'D TR IG IN. Front-panel BNC connector serving as
an external trigger input for the delayed 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.
OPERATING CHECKOUT
Introduction
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 perform ing both parts, or each
part may be performed separately.
NOTE
For optimum performance, the 1853A/1853AN
should be installed in an oscilloscope system with
similar frequency and sweep rate capabilities.
Setup Procedure
1. Install the 7 B53A/7 B53AN in the right horizontal
compartment of the ind icator oscilloscope.
2. Install a Vertical Amplifier unit in the left vertical
compartment.
3. Turn on the indicator oscilloscope and allow at least
20 minutes warmup.
4. Set the 7B53A/7B53AN controls as follows:
MAIN TRIGGERING
SLOPE
MODE
COUPLING
SOURCE
(+)
AUTO
AC
INT

DLY'D TRIG
LEVEL
SLOPE
COUPLING
SOURCE
Sweep
Controls
POSITION
MAG
TIME/DIV OR DLY TIME
DL Y'D Time/Division
VARIABLE
Variable Selector
DELAY TIME MUL T
RUNS AFTER DL Y
TIME (fully clockwise)
(+)
AC
INT
Midrange
Xl-IN
1 ms
1 ms
CAL (fully clockwise)
Main Variable
1.00
5. Set the indicator oscilloscope to display the plug-in
units and adjust for a well defined display. See ind icator
oscilloscope and vertical un it instruction manuals for
detailed operating instructions.
Sweep Control Functions
The following procedure checks the operation of the
sweep
controls and checks the Display Modes.
Normal Sweep
1. Perform steps one through five of the Setup
Procedure.
NOTE
The Time/Division switch selects main sweep rates,
delayed sweep rates, and Display Modes (MAIN SWP,
IN TEN, DL Y'D SWP, and MIXED). Refer to
Selecting Sweep Rates and Display Modes discussions
in the General Operating
Instructions for further
information.
2. To select the MAIN SWP Display Mode, press in the
DL Y'D Time/Division knob, and set the TIME/DIV OR
DLY TIME switch and the DLY'D Time/Division switch to
the same sweep rate (1 ms).
3. Connect the
one-kilohertz calibrator signal from the
ind icator oscilloscope
to the vertical amplifier un it Input.
Adjust 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 MUL T dial and note that it has no effect on
the display.
®
Operating Instructions-7B53A/7B53AN Operators
5. Rotate the POSITION control and note that it
horizontally positions the trace. Rotate the FI NE control
and note that it provides precise horizontal positioning.
Disconnect the
calibrator signal.
Sweep Calibration
NOTE
For accurate sweep timing, apply a signal of known
frequency or time period (time-mark signal, calibrator
square wave, 60 hertz line etc.) to the associated
vertical
amplifier unit and adjust the TlME/DIV OR
DL Y 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 calibration procedure uses
a TEKTRONIX Time-Mark Generator.
6. Connect a 1 millisecond time-mark signal from the
Time-Mark Generator with a 50-ohm BNC coaxial cable and
50-ohm 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 TRIG-
GERING 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. Dis-
connect 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 out the DL Y'D Time/Division knob and rotate
clockwise
to .1 ms/DIV for the I NTEN Display Mode
(TIME/DIV OR DLY 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
I ntensity may need to be varied to view the intensified
display).
8. Rotate the DELAY TIME MULT dial and note that
the amou nt of delay time before the intensified portion of
display is controlled by the DELAY TIME MUL T dial.
9. Rotate the VARIABLE control counterclockwise out
of switch detent and note that the sweep rate indicated by
the TIM E/D IV OR DL Y TIM E 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.
1-5