Tektronix 7A42 User manual

TEK
OPERATORS PRODUCT GROUP 42
MANUAL 070-4285-00
7A42
Logic Triggered
Vertical Amplifier
Please check for change information
at the rear of this manual.
I -
First Printing APRIL 1983
i' Revised JuL 1984
- i 4 ,-

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7A42 Operators
K =
TABLE OF CONTENTS
Page
...........................................
i '
...
OPERATORS SAFETY SUMMARY vi
DESCRIPTION ............................................................. VIII
i'
1
...............................
GENERAL INFORMATION
i'
COLOR USED IN THIS MANUAL 1.1
TECHNICAL MANUALS
........................................ 1.1
.....................................
i '
.........................................
OPERATORS MANUAL 1-1
SERVICE MANUAL 1.1
...................................................
i'
..........................................
INSTALLATION 1-2
INITIAL INSPECTION 1-2
OPERATING TEMPERATURE
.................................. 1.3
...................
i"
INSTALLING THE 7A42 IN THE MAINFRAME 1.3
MAINFRAME COMPATIBILITY
................................. 1.4
..................................
is
.....................................................
PACKAGING FOR SHIPMENT 1.5
SPECIFICATION 1.6
STANDARD ACCESSORIES
........................................ 1-24
.........................................
i"
OPTIONAL ACCESSORIES 1-24
PROBES
........................................................ 1-24
I m
.
1 2
OPERATING INSTRUCTIONS
OPERATION ................................................... 2.1
SIMPLIFIED BLOCK DIAGRAM OF 7A42
.............................. 2.1
.................................
i3
BOOLEAN ALGEBRA FOR 7A42 USE
.....................
2.3
CONTROLS. CONNECTORS. AND INDICATORS 2.9
....................................
i'
.....
GET-ACQUAINTED EXERCISES 2-13
EXERCISE 1-PRELIMINARY SET UP AND INITIALIZATION 2-13
PRELIMINARY SET UP
....................................... 2-13
.............................................
i"
INITIALIZATION 2-14
EXERCISE2-OBTAINING A TRIGGERED DISPLAY
............. 2-16
.............................
i "
............................
EXERCISE3-LOGIC TRIGGERING 2-36
DETAILED OPERATING INFORMATION 2-48
.....................................................
i"
................................
SELF.TEST 2-48
FRONT-PANEL INITIALIZATION 2-52
BATTERY BACKUP
............................................. 2-52
........................................
i"
OPERATOR MESSAGES 2-54
SIGNAL CONNECTIONS
........................................ 2-56
...................................
ig
.................................
RECOMMENDED PROBES 2-57
PROBE COMPENSATION 2-57
COAXIAL CABLES
........................................... 2-57
.................................................
k '7
CRT READOUT 2-57
POSITION
...................................................... 2-59
GAIN ........................................................... 2-59
i . '
i

TABLE OF CONTENTS (CONT)
OPERATING INSTRUCTIONS (CONT) Page
STATUS INDICATORS (CHI. CH2. CH3. CH4) ................... 2-59
DISPLAY
............................................. 2-59
ECLATL
.................................................... 2-59
GND
........................................................ 2-59
50WlMfI .................................................... 2-59
ALT/CHOP ..................................................... 2-60
TRIGGER FUNCTION
........................................... 2-60
A TRIGGER FUNCTION AND B TRIGGER FUNCTION
........ 2-60
A THEN B NESTED TRIGGERING
............................ 2-60
TRIG VIEW ..................................................... 2-61
TRIGGER FILTER
............................................... 2-61
EXT CLOCK SYNC
.............................................. 2-61
SLOPE SELECT
............................................. 2-61
EXT CLOCK INPUT
.......................................... 2-62
RESET INPUT
.................................................. 2-62
TRIGGER OUT
................................................. 2-62
PROG CHANARIG
............................................. 2-64
PROGRAM CHANNEL MODE
................................ 2-64
CHI. CH2. CH3. CH4 ...................................... 2-65
DISPLAY
.............................................. 2-65
TTL/ECL ................................................. 2-65
VOLTS/DIV ............................................... 2-65
GND
..................................................... 2-65
lMW50fl ................................................. 2-65
THRESH
.................................................. 2-65
PROBE OFFSET
.......................................... 2-66
LEVEL
.................................................... 2-66
PROGRAM TRIGGER MODE
................................. 2-67
CHI. CH2. CH3 AND CH4 ................................. 2-67
AND
...................................................... 2-67
OR
....................................................... 2-67
CLEAR
................................................... 2-67
NOT
...................................................... 2-67
EDGE
.................................................... 2-67
3
APPLICATIONS
APPLICATION 1-DISPLAYING FOUR CHANNELS OF DATA
WITH THE 7A42 .................................................. 3.1
MEASUREMENT TECHNIQUE
.................................. 3.1
VIEWING THE MASTER CLOCK LINE ....................... 3.2
APPLICATION 2-SOLVING ABNORMAL PULSE PROBLEMS
WITH THE 7A42 .................................................. 3.4
MEASUREMENT TECHNIQUE
.................................. 3-4
REV JUL 1984

TABLE OF CONTENTS (CONT)
APPLICATIONS (CONT) Page
APPLICATION 3-ADDING EDGE SENSITIVITY TO YOUR
TRIGGER FUNCTION
............................................ .3-6
MEASUREMENT TECHNIQUE..
............................... .3-6
APPLICATION 4-DETECTING AND DISPLAYING BUS
................................................... CONTENTION .3-9
MEASUREMENT TECHNIQUE
.................................. 3-9
APPLICATION 5-ENHANCED NESTED TRIGGERING USING
THE 7D15 225 MHz UNIVERSAL COUNTER/TIMER
.............. 3-11
EVENTS COUNTING
......................................... 3-11
COUNTING CLOCK CYCLES BETWEEN EVENTS..
........... 3-12
MEASURING TIME FROM FUNCTION A TO FUNCTION B
.... 3-12
APPLICATION 6-OFFSET PROBING TECHNIQUES FOR
HIGH SPEED LOGIC SYSTEMS ................................. 3-14
PROBING ECL CIRCUITS..
.................................. 3-15
7A42 PROBE OFFSET FEATURE ............................. 3-16
APPLICATION 7-USING THE 7A42 WITH THE 7854..
........... 3-17
APPLICATION 8-USING THE 7A42 WITH THE 7104..
........... 3-18
4
INSTRUMENT OPTIONS
INDEX
CHANGE INFORMATION
RELATED DOCUMENTATION
For informationon related7A42documentation refertoGeneral Information,Section
1of this manual under Technical Manuals and Standard Accessories.
iii

7A42 Operators
Figure
No .
1-1
1-2
2-1
2-2
LIST OF ILLUSTRATIONS
Page
7A42 release latch ................................................ 1-3
7A42 dimensional drawing ....................................... 1-23
Simplified block diagram of the 7A42
.............................. 2-2
Definition of the Boolean AND
. OR . NOT and XOR (EXCLUSIVE-OR)
logic functions
.................................................... 2-3
Examples of products of Channel 1through 4
...................... 2-5
Function
. f and g OR'ed together ................................... 2-6
Example of EDGE Qualified TRIGGER FUNCTION ................. 2-7
Example of A THEN B Nested Triggering
........................... 2-8
7A42 controls. connectors. and indicators ........................ 2-10
Self-test in progress
............................................. 2-48
Self-test finished ................................................ 2-48
7A42 front-panel drawing showing pushbuttons and indicators
that are illuminated during the self-test sequence
.................
2-49
Typical self-test failure display
................................... 2-50
7A42 front-panel control lights when initialized ................... 2-54
Channel readout display ......................................... 2-58
Channel readout display with 10X probes attached to inputs
of CHI. CH2. CH3. and CH4
.....................................
2-58
Timing diagram showing the relationship of the TRIGGER OUT
waveform to the input signals
.................................... 2-63
Timing diagram depicting the TRIGGER OUT waveform. as a
result of the TRIGGER FUNCTION reacting to the input signals
... 2-63
Example of A THEN
€3. level and EDGE sensitive TRIGGER FUNCTION.
showing the Normal and A THEN B Gate waveform alternatives
... 2-64
Triggering on the decimal "10" event
............................... 3-2
Display of four channels with TRIG VIEW trace
..................... 3-3
Four channel display with an external clock signal displayed on the
TRIG VIEW trace .................................................. 3-3
...............................
Triggering on a low-amplitude pulse 3-5
Timing diagram of
a typical microprocessor read cycle ............. 3-6
........................... Set up to monitor invalid data transitions 3-8
The 7A42 captures a positive transition of data during the time data
..................................................
should be stable 3.8
Bus contention measurement set up ............................. 3-10
Standard 500-ohm probe forms voltage divider with termination
.........................................................
resistor 3-14
Simplified diagram of the P6230 Variable Bias/Offset probe
....... 3-15
Two ECL level waveforms
. A without bias offset. B with a -2 volt
......................................................
bias offset 3-16

Table
No.
1-1
1-2
1-3
1-4
2-1
2-2
2-3
2-4
LIST OF TABLES
Page
Shipping Carton Test Strength.. .................................. .l-5
.........................................
Electrical Characteristics .1-6
...................................
Environmental Characteristics 1-21
.........................................
Physical Characteristics 1-22
...............................
7A42 Self-Test Failure Messages.. 2-51
...............
7A42 Front-Panel Control Settings When Initialized
2-53
...............................
7A42 Operator Message Summary 2-55
..................................
Channel Volts/Division Ranges 2-65

7A42 Operators
--
OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating
and sevicing personnel. Specific warnings and cautions will be found throughout
the manual where they apply, but may not appear in this summary.
TERMS
IN THlS 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.
SYMBOLS
IN THlS MANUAL
@ Static-Sensitive Devices
a
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.
a

WARNINGS
POWER SOURCE
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.
GROUNDING THE PRODUCT
This product is grounded through the grounding connector 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.
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
electrical shock.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES
To avoid explosion, do not operate this product in an atmosphere of explosive
gasses.
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 via a plug-in extender.
vii

7A42 Operators
The 7A42 Logic Triggered Vertical Amplifier is a four channel, wide bandwidth,
plug-in unit, compatible with Tektronix 7000-series Oscilloscopes. It was
specifically designed to display and make measurements on digital logic signals in
the TTL. ECL and CMOS logic families. While the display output from the 7A42 is
analog, the trigger output is digital and is comprised of a user selectable Boolean
function of the four input channels. A fifth TRIGGER VIEW trace depicts either the
trigger function output or the external clock input.
viii

SECTION 1 CONTENTS
.................................. COLOR USED IN THIS MANUAL .l-1
TECHNICAL MANUALS
............................................ .l-1
OPERATORS MANUAL .......................................... .l-1
............................................... SERVICE MANUAL 1-1
INSTALLATION..
...................................................... .l-2
INITIAL INSPECTION .............................................. .l-2
OPERATING TEMPERATURE
....................................... .l-3
INSTALLING THE 7A42 IN THE MAINFRAME
...................... .l-3
MAINFRAME COMPATIBILITY
....................................... 1-4
PACKAGING FOR SHIPMENT ....................................... 1-5
SPECIFICATION
.......................................................... .l-6
STANDARD ACCESSORIES
............................................. 1-24
OPTIONAL ACCESSORIES .............................................. 1-24
PROBES..
............................................................ 1-24

GENERAL INFORMATION
This section contains a basic content description of both the Operators and
Service manuals, information on instrument installation, power requirements,
packaging for shipment, Standard Accessories, Optional Accessories,
Specifications and a dimensional drawing of the 7A42. The specification portion
consists of three tables: Electrical, Environmental, and Physical Characteristics.
COLOR USED IN THIS MANUAL
Red, green and yellow color is used in this manual to visually correlate the front-
panel indicators and markings to the descriptions of the text.
TECHNICAL MANUALS
An operators and two service manuals are supplied with your 7A42 as standard
accessories. The following information outlines the content of these manuals.
Operators Manual
The Operators Manual is divided into the following four sections:
Section 1-GENERAL INFORMATION contains content descriptions of the
Operators and Service manuals, instrument description, mainframe and plug-in
compatibility, packaging instructions and instrument specifications.
Section 2-OPERATING INSTRUCTIONS contains a block diagram
description, a front-panel drawing and brief description of controls,connectors
and indicators. Get-Acquainted Exercises provide a bask operating procedure
for the first-time user followed by a systematic demonstration of all front-panel
controls. A detailed description of all front-panel controls is also given in this
section.
Section 3-APPLICATIONS gives examples of how to use the 7A42 to make
some difficult. measurements.
Section 4-INSTRUMENT OPTIONS contains a description of available
options.
Service Manual -
7
1 WARNING I
The following service instructions are for use by qualified personnel
only. To avoidpersonal injury, do notperform any service other than
that contained in the operating instructions unless you are qualified
to do so. Refer to Operators Safety Summary and Service Safety
Summary prior to performing any service.

General Information-7A42
The service manual is divided into 2 volumes. Volume
1 contains the following:
Section 1-GENERAL INFORMATION contains content descriptions of the
Operators and Service manuals, mainframe and plug-in compatibility,
packaging instructions and instrument specifications.
Section 2-THEORY OF OPERATION contains basic and general circuit
analysis that is useful for servicing the instrument.
Section 3-MAINTENANCE describes preventive maintenance procedures,
conventional troubleshooting and diagnostic troubleshooting procedures with
detailed instructions for replacing assemblies, subassemblies, and individual
components.
Section 4-CHECKS AND ADJUSTMENT contains procedures to check the
operational performance and electrical characteristics of the instrument.
Procedures also include methods for adjustment of the instrument to meet
specifications.
Section 5-INSTRUMENT OPTIONS contains a description of available
options.
Section 6-REPLACEABLE ELECTRICAL PARTS contains information
necessary to order replaceable parts and assemblies related to the electrical
functions of the instrument.
Section 7-DIAGRAMS AND CIRCUIT
BOARD ILLUSTRATIONS includes
detailed circuit schematics, locations of assembled boards within the
instrument, voltage and waveform information and circuit board component
locators.
Section 8-REPLACEABLE MECHANICAL PARTS includes information
necessary to order replaceable mechanical parts and shows exploded drawings
which identify assemblies.
Volume 2 of the service manual contains signature analysis tables to be used with
the diagnostic information provided in the Maintenance section of the Volume
1
service manual.
INSTALLATION
INITIAL INSPECTION
This instrument was inspected both mechanically and electrically before shipment.
It should be free of mars or scratches and should meet or exceed all electrical
specifications. To confirm this, inspect the instrument for physical damage
incurred in transit and check the basic instrument functions by performing the
Get-Acquainted Exercises in Section 2, Operating Instructions. Qualified service
personnel can verify Performance Requirements by referring to the Checks and
Adjustment section of the service manual. If there is damage or deficiency, contact
your local Tektronix Field Office or representative.

I, -
General Information-7A42
t:
-
E :!Y
OPERATING TEMPERATURE
The 7A42 can be operated where the amb~entalr temperature is from OD to +50° C
and can be stored in ambient temperatures from -55O to +75O C. After storage at
temperatures outside the operat~nglimits, allow the chass~stemperature to reach
operating limits before apply~ngpower.
INSTALI-ING THE 7A42 IN THE MAINFRAME
i '
The 7A42 is designed to operate in the two center or the two left most plug-in
compartments
of a Tektronjx 7000-series oscilloscope mainframe.
. a
NOTE
Switch off the mainframe power before installing or removing the
7A 42.
To install the 7A42 in the mainframe, align the grooves in the top and bottom of
the instrument with the guides at the top and bottom of the plug-in compartment.
Then push the 7A42 in until its front panel is flush with the front panel of the
mainframe.
i '
To remove the 7A42from its host mainframe, pullthe release latch (see Fig. 1-1) to
disengage the unit from the mainframe, then pull the 7A42 straight out from the
3
plug-in compartment leaving the mainframe on the bench.
, ,. , ; ;"'*
RELEASE
LATCH
4285-1 02
Figure 1-1. 7A42 release latch.

General Information-7A42
MAINFRAME COMPATIBILITY
The 7A42 is compatible with all Tektronix 7000 series mainframes. In four-wide
plug-in compartment mainframes, it can be installed in either the two leftmost or
two centermost plug-in compartments. When used in the two leftmost
compartments, select the Left Vertical Mode to display the analog signals. The
associated time base plug-in Trigger Source should be Left Vertical with the time-
base trigger controls set to Auto or Norm, Dc. Internal, Slope to
+, with the Level
control centered. The A Then
B Gate Output can be picked off from the RIGHT
VERTICAL TRIGGER SOURCE by a 7D11 or 7D15 from either horizontal
compartment. In three-wide plug-in compartment mainframes, the 7A42 must be
used in the two leftmost compartments in a similar way.
When the 7A42 is installed In the center two plug-in compartments of a four
compartment mainframe; set the mainframe Vertical Mode and Trigger Source to
Right Vertical. The mainframe A Then
B Gate Output can not be used in this
configuration, however, the A Then
B Gate is still available at the front-panel
TRIGGER OUT bnc connector.
Since all analog channels are sent out the 7A42's left interface connector, it cannot
use the full capabilities of a dual beam oscilloscope such as the 7844, R7844, and
the 7612D. However, it has full compatibility with these mainframes in a single
beam configuration.
Since the 7A42 uses the mainframe crt readout to display the channel volts per
division and error warning messages, the 7A42 is not recommended for use in
mainframes without readout.
If the 7A42 is used with two time-base units in a four compartment mainframe
where Chop has been selected as the Horizontal Mode, and if exactly four traces
are to be displayed by the 7A42, two of the traces may synchronize to one time
base while the other two traces synchronize to the other time base. To prevent this
from happening, one trace should be removed, or a fifth trace should be added to
the mainframe crt display (even if it is positioned off screen so it cannot be seen).
With one, two, three, or five traces, the channel display will not synchronize to the
horizontal chop frequency.
The 7A42 is compatible with the 7854 Oscilloscope mainframe when the 7854 is
operated in real-time. However, when the 7854 is operated in digital storage, and
waveform and readout acquisition is desired, the 7A42-7854 mode should be
selected, via an internal jumper; refer qualified service personnel to the 7A42
Service manual. Once the 7A42-7854 mode has been selected. proper readout and
waveform acquisition can be guaranteed with the following 7A42 display
conditions:
1. Any single channel displayed alone (CHI. CH2. CH3, CH4, or TRIG VIEW).
2. Channels
1 and 2 only displayed together, ALT display mode selected
3. Channels 3 and 4 only displayed together, ALT display mode selected
Refer to the Applications sect~onin this manual for further information

L
General Information-7A42
" ! :J
PACKAGING FOR SHIPMENT
L
If this instrument is to be shipped by commercial transportation, we recommend
that the instrument be packaged in the original manner. The carton and packaging
i'
material in which your instrument was shipped should be saved and used for this
purpose.
i' NOTE
Package and ship Plug-Ins and Mainframes separately.
C -
i'
If this instrument is to be shipped to a Tektronix Service Center for service or
repair, attach a tag to the instrument showing the following: Owner of the
instrument (with address), the name of a person at your firm who can be
i '
contacted, complete instrument type and serial number, and a description of the
service required.
i
If the original package is unfit for use or not available, package the instrument as
follows:
i l
1. Obtain a corrugated cardboard shipping carton having inside dimensions at
i'
least six inches greater than the instrument dimensions; refer to Table 1-1 for
carton test strength requirements.
i '
2. Enclose the instrument with polyethylene sheeting or equivalent to protect
r 3
the finish of the instrument.
3. Cushion the instrument on all sides by tightly packaging dunnage or urethane
I
foam between the carton and the instrument, allowing three inches of
i r
packaging on each side.
P
A
4. Seal the carton with shipping tape or with an industrial stapler
1 -
5. Mark the address of the Tektronix Service Center and your return address on
the carton in one or more prominent locations.
8 r
TABLE 1-1
Shipping Carton Test Strength
I
Gross Weight (Ib) I Carton Test Strength (Ib)
i '
--
. r
0
--
200

General Information-7A42
SPECIFICATION
The electrical characteristics listed in Table 1-2 apply when the following
conditions are met:
(1) Adjustment of the instrument must have taken place at an
ambient temperature between +20° and +30° C, (2) the instrument is allowed a 20-
minute warm-up period, (3) specifications are valid at an ambient temperature of
O0 to +50° C, unless otherwise stated, (4) the instrument must be in an
environment that meets the limits described in Table 1-3, (5) the instrument must
be operated in a calibrated 7000-series mainframe.
Any applicable conditions not listed above may be stated as part of the
characteristic. Environmental characteristics are listed in Table 1-3 and Physical
characteristics are listed in Table 1-4.
TABLE 1-2
Electrical Characteristics
Characteristic
Deflection Factor
Performance
Requirement
Calibrated Range at
Input BNC Connector
Supplemental
Information
TTL (CMOS)
Family
DISPLAY
ECL Family 1 20. 50. 100 mV/div I
Calibrated Range
through a 10X Probe
TTL (CMOS)
Family
ECL Family
1 0.2. 05, 1 V/div.
Gain Match Logic Family, 20 mV/
div. 1 Megohm

General Information-7A42
TABLE 1-2 (CONT)
Electrical Characterlstlcs
DISPLAY (CONT)
Characteristic
Deflection Factor (cont)
Gain Ratio Accuracy
within the same
Channel
Performance
Requlrement
Within
2% of indi-
cated deflection
factor relative to
ECL Logic Family,
20 mV/div,
1 Megohm
input impedance.
Supplemental
Information
deflection factor for cali-
brated operation with any
calibrated 7000-series
mainframe.Adjustable at
least
+4% to -4% from
calibrated setting.
I I
Frequency Response 350 MHz in 7104, 0" I
GAIN Range
Bandwidth
- 35°C mainframe am-
bient temperature.
Permits adjustment of
Refer to Tektronix
Product Catalog 7000-
Series Oscilloscope
System Specification
for system bandwidths.
Input Signal Dynamic
Range
Maximum Signal
Voltage at tip of
10X Probe
TTL (CMOS)
Family
ECL Family
I 1pv.
output Dynamic Range Limited to the CRT
display area. Mainframe
Vertical Trace Separation
should not be used to
bring an off-screen
signal onto screen.
REV JUL 1984
1-7

General Information-7A42
TABLE
1-2 (CONT)
Electrical Characteristics
Characteristic Performance
Requirement Supplemental
Information
DISPLAY (CONT)
Maximum lnput Voltage
1 Megohm 25 V (dc
+ peak ac)
36 MHz or less, derated
linearly to 3 V (peak
ac) at 300 Mhz.
50 Ohm 5 V RMS during any
1 ms time interval. Active
internal protection opens
all inputs if overvoltage
is applied to any channel.
50-Ohm lnput Protec-
tion Reaction Time
Maximum time to ope1
input with applied
overvoltage of:
10 seconds.
1 second
0.5 second.
lnput Characteristics
lnput Coupling
Incoming signal is dc-
coupled to the amplifier
GND A grounded input is
actually open at the
input BNC, (i.e.,
1 Megohm or 50 Ohm
termination is dis-
connected). Internally,
the amplifier input
is grounded to provide
a zero-volt input
reference.