Tektronix 3B5 User manual

INSTRUCTION
MANUAL
Serial Number _____________
TYPE 3B5
AUTOMATIC/
PROGRAMMABLE
TIME BASE
Tektronix, Inc.
S.W. Millikan Way • P. O. Box 500 • Beaverton, Oregon 97005 • P one 644-0161 • Cables: Tektronix
070-0538-00
666

WARRANTY
All Tektronix inst-uments are warranted
against defective materials and workman 
s ip for one year. Tektronix transformers,
manufactured in our own plant, are war 
ranted for t e life of t e instrument.
Any questions wit respect to t e war 
ranty mentioned above s ould be taken
up wit your Tektronix Field Engineer.
Tektronix repair and replacement-part
service is geared directly to t e field,
t erefore all requests for repairs and re 
placement parts s ould be directed to t e
Tektronix Field Office or representative in
your area. T is procedure will assure you
t e fastest possible service. Please include
t e instrument Type and Serial or Model
Number wit all requests for parts or
service.
Specifications and price c ange privi 
leges reserved.
Copyrig t c 1966 by Tektronix, Inc.,
Beaverton, Oregon. Printed in t e United
States of America. All rig ts reserved.
Contents of t is publication may not be
reproduced in any form wit out permission
of t e copyrig t owner.
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Type 3B5

CONTENTS
Section
Section
Section
Section
Section
Section
1
2
3
4
5
6
C aracteristics
Operating Instructions
Circuit Description
Maintenance
Performance C eck
Calibration
Abbreviations and Symbols
Parts Ordering Information
Section 7 Electrical Parts List
Mec anical
Parts List Information
Section 8 Mec anical
Parts
List
I
j
Section 9
Diagrams
Mec anical Parts
List Illustrations
Accessories
t is manual
Abbreviations and symbols used in
are based on, or taken directly from, IEEE
Standard 260 “ Standard Symbols for Units ”
MIL-STD-12B and ot er standards of t e elec 
tronics industry. C ange information, if any,
is located at t e rear of t is manual.
■®1
Type 3B5

Fig. 1-1. Type 3B5 Auto atic/Progra able Ti e Base unit.
Type 3B5

SECTION 1
CHARACTERISTICS
T e Tektronix Type 3B5 Automatic/Programmable Time
Base unit provides automatic and programmable time-base
features, in addition to conventional time-base features, for
Tektronix oscilloscopes w ic accept 3-series time-base units 1 .
T e Type 3B5 provides automatic sweep rate and trigger
seeking on Seek command eit er from t e front-panel SEEK
button, from a remote-seeking probe (t roug an associated
automatic/programmable amplifier unit) or from an external
source (t roug eit er t e front-panel PROGRAM connector
or t e program connector of t e associated automatic/pro 
grammable amplifier unit). All front-panel control functions
(except variable sweep rate) can be externally programmed
t roug t e front-panel PROGRAM connector. T e MANUAL
TIME/DIV switc provides selection of sweep rates from 5
seconds/division to 10 nanoseconds/division wit delayed
1 Except the Type 561 (SN 5000 and below). When used in a Type
565, a vertical sweep is provided.
sweep magnification of 10 and 100 times (up to a maximum
magnified sweep rate of 0.1 microseconds/division).
A front-panel illuminated readout panel indicates sweep
rate, magnified sweep (wit correct indication of magnified
sweep rate), non-triggered sweep and uncalibrated sweep.
T e readout panel functions in all modes of operation.
T e c aracteristics w ic follow are divided into two cate 
gories. C aracteristics listed in t e Performance Requirement
column are c ecked in t e Performance C eck and Calibra 
tion sections of t is manual. Items listed in t e Supplemental
Information column are provided for reference use and do
not directly reflect t e measurement capabilities of t is
instrument. T e Performance C eck procedure given in
Section 5 of t is manual provides a convenient met od of
c ecking t e Performance Requirements listed in t is section.
T e following c aracteristics apply over an ambient tempera 
ture range of 0° C to +50° C, except as ot erwise indicated.
Warm-up time for given accuracy is five minutes.
ELECTRICAL CHARACTERISTICS
TRIGGERING
C aracteristic
Performance Requirement
Supplemental Information
Source
Internal or external
Coupling
AC internal
AC or DC external
Polarity
Sweep can be triggered from positive-going
or negative-going portion of trigger signal.
Slope c anged automatically eac time
CHANGE SLOPE button is pressed.
Mode
Auto triggering
Normal triggering adjustable for desired level
Internal Trigger Sensitivity
AUTO and AC
0.5 division of deflection, minimum, 50 Hz to
20 MHz
C ecked wit Type 3A5 signal dis 
played, 10 millivolts/division or greater
sine wave. Typically — 3 dB down at
10Hz
External Trigger Sensitivity
AC
1.0 volt, peak to peak, 50 Hz to 20 MHz Typically — 3 dB down at 10 Hz
DC
1.0 volt, peak to peak, 10 Hz to 20 MHz
2.5 volts, peak to peak, DC to 10 Hz
Trigger LEVEL Control Range
INT-AC At least + and — 10 volts
EXT-AC At least + and — 20 volts
EXT-DC
At least + and — 10 volts
AUTO
Approximately 10% and 90% of trigger
signal transition wit a minimum of 0.5
division, (10 millivolts/division or greater)
1 kHz sine wave displayed wit Type 3A5
External Program Trigger
Level Range
Same as front-panel range wit current
c ange between about 0 and 400 micro 
amps
External Trigger Input
RC C aracteristics
Approximately 150 kilo ms paralleled by
about 22 pF
Maximum Input Voltage at
EXT TRIG INPUT connector
100 volts, DC + peak AC
1-1

Characteristics — Type 3B5
HORIZONTAL DEFLECTION SYSTEM
C aracteristic
Performance Requirement
Supplemental Information
Sweep Rates
Manual Mode
5 seconds/division to 10 nanoseconds/division
in 27 calibrated steps. Sweep rate indicated
on readout panel
Selected by front-panel MANUAL TIME/
DIV switc . Steps in 1-2-5 sequence
Seek Mode
5 seconds/division to 3.1 microseconds/divi-
sion in 24 calibrated sleps. Sweep rate indi 
cated on readout panel
Automatically selected w en seek com 
mand is received. Steps in 1-2-5 sequence
External Mode
5 seconds/division to 10 nanoseconds/division
in 27 calibrated steps. Sweep rate indicated
on readout panel
Selected by external program connected
to PROGRAM connector. Steps in 1-2-5
sequence
Sweep Accuracy (at 25° C, ±5°)
1 s to 10 ns
Wit in ±3% of indicated sweep rate
VARIABLE control fully clockwise (UN 
CAL readout off) and DLY'D SWP MAG
switc set to OFF (MAG'D SWP readout
off). 10, 20 and 50 ns accuracy must be
c ecked in accordance wit Performance
C eck
5 s and 2 s
Wit in ±5% of indicated sweep rate
Variable Sweep Rate
Uncalibrated sweep rate to 2.5 times, or
greater, t e indicated sweep rate. s/DIV read 
out turns off and UNCAL readout turns on
w en VARIABLE control is not set to CAL posi 
tion
Slowest sweep rate 12.5 seconds/divi 
sion, or greater, in 5 s position
Sweep Lengt
DLY ’ D SWP MAG at OFF
10.3 to 11.3 divisions
Measured at 1 ms/DIV sweep rate
DLY'D SWP MAG on
12 to 15 divisions
Delayed Sweep Magnification
Basic sweep rates between 5 s and 1 μ s can be
magnified wit t e Del a yed Sweep Magnifier.
Calibrated DELAY control selects portion to be
magnified. Basic sweep rates between 5 s and
10 μ s can be magnified 100 times; basic sweep
rates between 5 s and 1 μ s can be magnified
10 times
Readout panel indicates correct magni 
fied sweep rate
Magnified Sweep Accuracy
(at 25° C, ±5°)
1 S to 1 JUS
Wit in ± 3% of sweep rate indicated on read 
out panel
VARIABLE control fully clockwise (UN-
CAL readout off)
5 s and 2 s
Wit in ±5% of sweep rate indicated on read 
out panel
Calibrated Delay Range
Continuous from 0 to 10 divisions from t e start
of t e trace
Delay Accuracy Wit in ±1.5% of fu l l scale at 1 ms/DIV.
Wit in ±3% of full scale at all ot er sweep
rates
Calibrated at 1 ms/DIV. Exclude first
0.2 division of display. Includes incre 
mental DELAY dial linearity
Incremental DELAY Dial Linearity
Wit in ±0.4% of full scale
Exclude first 0.2 division of display
Delayed Sweep Magnifier Jitter
3 parts or less per 10,000
Equal to 0.3 division or less w en meas 
ured wit x1 00 magnification at 1 ms/
DIV basic sweep rate
Output DC Level
4-180 volts, ±10 volts
Beam positioned to CRT electrical center
SEEK MODE
Cycles Per Sweep Between two and six cycles wit nominal
CYCLES/SWEEP setting obtained in Calibra 
tion procedure
Automatically selected w en seek com 
mand is received. Front-panel CYCLES/
SWEEP adjustment provides range of
about 0.5 to 3 times t is nominal setting
Automatic Seek Cycling Time One to two seconds W en seek command is continuous
Automatic Seeking Time 500 milliseconds or less wit 10 MHz
sine wave input and Trigger Function
switc set to INT-AUTO
Frequency Range for Seek Mode
Operation
30 Hz to 20 MHz
Seek Mono Pulse Widt 1.0 to 1.8 seconds
1-2

Characteristics — Type 3B5
PROGRAMMABLE FUNCTIONS
C aracteristic
Performance Requirement
Supplemental Information
Trigger Function
Int Auto — If not programmed
Int AC — Terminal 31
Ext AC — Terminal 30
Ext DC — Terminal 28
Grounding (zero volt) digital logic to
given terminal of PROGRAM connector
activates function
Trigger Slope
+ Slope — If not programmed
— Slope — Terminal 27
Trigger Level
Analog current c ange between about 0
and 400 microamps at terminal 15 of
PROGRAM connector provides same trig 
ger level range as front-panel LEVEL
control
Sweep Rate
Multiplier
X 1 — Terminal 2
X2 — Terminal 3
X5 — Terminal 5
Sweep multiplier, sweep decade and
decade enable must be programmed for
eac sweep rate. Grounding (zero volt)
digital logic to given terminals of PRO 
GRAM connector activates function
Enable
A — Terminal 23
B — Terminal 24
Decade
Enable Logic
Terminal
A
B
1 s
0.1 s
6
10 ms
1 ms
8
0.1 ms
10 μ s 9
1 μ s
0.1 μ s
11
10 ns
26
Horizontal Position
Analog current c ange between about
0 and 500 microamps at terminal 14 of
PROGRAM connector provides ±3 divi 
sion external orizontal position range
Delayed Sweep Magnifier
OFF — Terminal 33
X10 — Terminal 34
X 1 00 — Terminal 36
Grounding (zero volt) digital logic to
given terminal of PROGRAM connector
activates function
Magnifier Delay
Analog current c ange between about
350 and 200 microamps at terminal 17
of PROGRAM connector provides 0 to
10 division external delay range
External Mode Command
Type 3B5 switc es to External Mode w en
terminal 21 of PROGRAM connector is
grounded
Remote Seek
Type 3B5 switc es to Seek Mode (except
w en External Mode Command is present)
w en terminal 12 of PROGRAM connector is
grounded
Momentary ground produces two to six
cycles (nominal adjustment) display; con 
tinuous ground recycles unit every one to
two seconds
Single Sweep
+ 125-volt external oldoff lockout ap 
plied to terminal 7 and — 12-volts reset
momentarily applied to terminal 25 of
PROGRAM connector provides single 
sweep operation
ADDITIONAL FUNCTIONS AVAILABLE
AT PROGRAM CONNECTOR
External Horizontal Input
Deflection factor
Applied to terminal 4 of PROGRAM
connector. Sweep lockout at terminal 7,
external unblanking at terminal 13 and
orizontal position centering at terminal
14 also necessary.
5 volts/division ±5%
Bandwidt
DC to 750 kHz, or greater
Maximum input voltage
75 volts, DC + peak AC
Input resistance
Approximately 100 kilo ms
1-3

Characteristics — Type 3B5
Additional Functions (cont)
C aracteristic
Performance Requirement Supplemental Information
Sweep Out
0.05 milliamp/division, ±10%, at termi 
nal 16 of program connector 2
External Unblanking — 12 volts DC unblanks CRT
Apply to terminal 13 of PROGRAM con 
nector
Current Available from PROGRAM
Connector (maximum)
Supply Terminal Current
+ 125 V
18
30 mA
-12.2 V 1
75 mA
-100 V 19
1 mA
ENVIRONMENTAL CHARACTERISTICS
T e following environmental test limits apply w en tested
in accordance wit t e recommended test procedure. T is
instrument will meet t e electrical performance requirements
given in t is section following environmental test. Complete
details on environmental test procedures, including failure
criteria, etc., may be obtained from Tektronix, Inc. Contact
your local Tektronix Field Office or representative.
C aracteristic
Performance Requirement
Supplemental Information
Temperature
Operating
0° C to +50° C
Non-operating
-40° C to +65° C
Altitude
Operating
15,000 feet maximum
Non-operating
50,000 feet maximum
May be tested during non-operating
temperature tests
Vibration
Operating Vibrate for 15 minutes along eac axis at a
total displacement of 0.015 inc (1.9 g at 50
c/s) wit t e frequency varied from 10-50-10
c/s in one-minute cycles. Hold at any resonant
point for t ree minutes. If no resonant points
are found, vibrate at 51) c/s for t ree minutes
on eac axis.
Instrument secured to vibration platform
during test. Total vibration time about
55 minutes.
S ock
Non-operating
One s ock of 30 g, one- alf sine, 11 milli 
second duration along eac major axis.
Guillotine type s ock
Transportation
Package vibration
Meets National Safe Transit type of test w en
correctly packaged
Vibrate for one our slig tly in excess of 1 g
Package s ould just leave vibration sur 
face
Package drop
Drop from a eig t of 30 inc es on one corner,
all edges radiating from t at corner and all
flat surfaces
Total of 10 drops
MECHANICAL CHARACTERISTICS
Si ilar output available at ter inal 18 of the interconnecting plug.
C aracteristic
Information
Construction
C assis
Aluminum alloy
Panel Aluminum alloy wit anodized
finis
Circuit boards
Glass-expoxy laminate
Dimensions
Fits 3-series compartments of 560-
series Oscilloscopes
Connectors
EXT TRIG INPUT BNC
PROGRAM
37-terminal connector. Mates wit
Cinc No. DC-37P-C33 (Tektronix
Part No. 131-0422-00)
STANDARD ACCESSORIES
Standard accessories supplied wit t e Type 3B5 are listed
on t e last pullout page at t e rear of t is manual. For
optional accessories available for use wit t is instrument,
see t e current Tektronix, Inc. catalog.
1-4

SECTION 2
OPERATING INSTRUCTIONS
General Infor ation
To effectively use t e Type 3B5, t e operation and capa 
bilities of t e instrument must be known. T is section
describes t e operation of t e front-panel controls and con 
nectors, gives first time and general operating information,
External Mode programming information and lists some
basic applications for t is instrument.
T e Type 3B5 operates wit t e indicator oscilloscope and
an amplifier unit to form a complete oscilloscope system.
W en used wit an automatic programmable amplifier unit, a
remote-seeking probe and an external programmer, a com 
plete system is formed w ic as manual, automatic seeking,
remote seeking and external programming measurement
capabilities.
Installation
CAUTION
Turn off t e oscilloscope power before inserting
or removing t e plug-in unit.
T e Type 3B5 is designed for use in t e Horizontal plug
in compartment of a 560-series indicator oscilloscope. How 
ever, t e Type 3B5 can be inserted into t e Vertical plug-in
compartment of t e indicator oscilloscope to provide a sweep
t at runs vertically on t e CRT screen (no blanking provided
and instrument may not meet performance requirements given
in Section 1 if used in t is manner). Since t e orizontal and
vertical deflection plate sensitivities of t e oscilloscope are
different, t e Type 3B5 must be recalibrated to provide an
accurate display for vertical deflection use. T roug out t is
manual, it is assumed t at t e Type 3B5 is used to provide
orizontal deflection in t e conventional manner.
To install t e Type 3B5 in t e oscilloscope, insert it into
t e plug-in compartment and pus it in as far as possible.
Be sure t e securing latc at t e bottom of t e panel is out
of t e way (turn knob counterclockwise) to prevent damage
to t e oscilloscope front panel. Secure t e plug-in into t e
compartment by turning t e securing-latc knob clockwise
until it is tig t. To remove t e plug-in from t e compartment,
turn t e securing-latc knob several turns counterclockwise.
T en, pull t e plug-in partially out of t e compartment wit
t e knob and take old of t e plug-in by t e support rods
to remove it from t e oscilloscope.
W enever t e Type 3B5 is transferred from one oscillo 
scope to anot er, t e sweep calibration s ould be c ecked
and adjusted if necessary to provide accurate measurements
wit t e complete system. See Horizontal Gain Adjustment
in t is section for adjustment procedure.
Cooling
T e Type 3B5 does not require special cooling ot er t an
t at provided by t e indicator oscilloscope. W en operated
wit in t e ambient temperature range given in Section 1,
t e Type 3B5 provides accurate measurements (note excep 
tion for sweep accuracy).
FRONT-PANEL CONTROLS AND CONNECTORS
Introduction
All controls and connectors required for t e operation of
t e Type 3B5 are located on t e front panel of t e unit (see
Fig. 2-1). To make full use of t e capabilities of t is instru 
ment, t e operator s ould be familiar wit t e function and
use of eac of t ese controls and connectors. A brief descrip 
tion of t e function or operation of t e front-panel controls
and connectors follows. More detailed information on con 
trol operation and use is given under General Operating
Information.
Trigger Controls
EXT TRIG Input connector for external trigger signal.
INPUT
Trigger Function
(not labeled)
SLOPE
Lever switc w ic selects t e trigger
source, coupling and mode.
INT-AUTO — Permits normal triggering on
repetitive waveforms wit repetition
rates ig er t an 50 Hz. For lower repe 
tition rates or w en t ere is no trigger
signal, t e sweep generator free runs at
t e sweep rate to w ic it is set to pro 
vide a reference trace. Auto Trigger
lig t indicates w en unit is in t e auto
trigger mode.
INT-AC — Sweep triggered by internal sig 
nal from amplifier unit. Trigger circuit
rejects DC and attenuates AC signals
below about 50 Hz.
EXT-AC — Sweep triggered by external sig 
nal applied to t e EXT TRIG INPUT con 
nector. Trigger circuit rejects DC and
attenuates AC signals below about
50 Hz.
EXT-DC — Sweep triggered by external sig 
nal applied to t e EXT TRIG INPUT con 
nector. Trigger circuit accepts AC and
DC signals.
(+) and ( — ) lig ts indicate w ic slope of
t e trigger signal starts t e sweep. W en
t e ( — ) lig t is on, t e sweep can be trig 
gered on t e negative-going slope of t e
trigger signal; t e (+) lig t indicates t at
t e sweep can be triggered on t e positive 
going slope of t e trigger signal. Trigger
slope is c anged by pressing t e CHANGE
SLOPE button in t e center of t e LEVEL
control.
2-1

Operating Instructions — Type 3B5
Fig, 2-1. Front-panel controls and connectors of the Type 3B5.
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2-2