Tektronix 7A42 User manual

PRODUCT GROUP 42
070-4285-00
OPERATORS
MANUAL
Logic Triggered
Vertica Amp ifier
P ease check for change information
at the rear of this manua.
First Printing APRIL 1983
Revised JUL 1984
Tektronix
COMMITTED TO EXCELLENCE
TEK
7A42

7M2 Operators
TABLE OF CONTENTS
Page
OPERATORS SAFETY SUMMARY ............................................................................. vi
DESCRIPTION ............................................................................................................. viii
1
GENE AL INFO MATION
COLOR USED IN THIS MANUAL ....................................................... 1-1
TECHNICAL MANUALS ....................................................................... 1-1
OPERATORS MANUAL .................................................................. 1-1
SERVICE MANUAL ......................................................................... 1-1
INSTALLATION ........................................................................................... 1-2
INITIAL INSPECTION ........................................................................... 1-2
OPERATING TEMPERATURE ............................................................ 1-3
INSTALLING THE 7A42 IN THE MAINFRAME ................................. 1-3
MAINFRAME COMPATIBILITY .......................................................... 1-4
PACKAGING FOR SHIPMENT ............................................................ 1-5
SPECIFICATION .............................................................................................. 1-6
STANDARD ACCESSORIES ...................................................................... 1-24
OPTIONAL ACCESSORIES ........................................................................ 1-24
PROBES ................................................................................................... 1-24
2
OPE ATING INST UCTIONS
OPERATION ........................................................................................... 2-1
SIMPLIFIED BLOCK DIAGRAM OF 7A42 ..................................................... 2-1
BOOLEAN ALGEBRA FOR 7A42 USE .......................................................... 2-3
CONTROLS, CONNECTORS, AND INDICATORS ..................................... 2-9
GET-ACQUAINTED EXERCISES ............................................................... 2-13
EXERCISE 1 — PRELIMINARY SET UP AND INITIALIZATION ....... 2-13
PRELIMINARY SET UP .................................................................... 2-13
INITIALIZATION ............................................................................... 2-14
EXERCISE 2 — OBTAINING A TRIGGERED DISPLAY ...................... 2-16
EXERCISE 3 — LOGIC TRIGGERING .................................................. 2-36
DETAILED OPERATING INFORMATION ................................................. 2-48
SELF-TEST .............................................................................................. 2-48
FRONT-PANEL INITIALIZATION ........................................................ 2-52
BATTERY BACKUP ............................................................................... 2-52
OPERATOR MESSAGES ...................................................................... 2-54
SIGNAL CONNECTIONS ...................................................................... 2-56
RECOMMENDED PROBES ............................................................. 2-57
PROBE COMPENSATION .......................................................... 2-57
COAXIAL CABLES ........................................................................... 2-57
CRT READOUT ...................................................................................... 2-57
POSITION ............................................................................................... 2-59
GAIN ......................................................................................................... 2-59

7A42 Operators
TABLE OF CONTENTS (CONT)
OPERATING INSTRUCTIONS (CONT) Page
STATUS INDICATORS (CH1, CH2, CH3, CH4) ................................ 2-59
DISPLAY ............................................................................................ 2-59
ECL/TTL ............................................................................................ 2-59
GND ................................................................................................... 2-59
50Ω/1MΩ ............................................................................................ 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 CHAN/TRIG ............................................................................... 2-64
PROGRAM CHANNEL MODE ........................................................ 2-64
CH1, CH2, CH3, CH4 ................................................................... 2-65
DISPLAY ...................................................................................... 2-65
TTL/ECL ...................................................................................... 2-65
VOLTS/DIV ................................................................................... 2-65
GND ............................................................................................. 2-65
1MΩ/50Ω ...................................................................................... 2-65
THRESH ........................................................................................ 2-65
PROBE OFFSET .......................................................................... 2-66
LEVEL ............................................................................................ 2-66
PROGRAM TRIGGER MODE .......................................................... 2-67
CH1, 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
jj REV JUL 1984

7A42 Operators
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
INST UMENT OPTIONS
INDEX
CHANGE INFO MATION
ELATED DOCUMENTATION
For information on re ated 7A42 documentation referto Genera Information, Section
1 of this manua under Technica Manua s and Standard Accessories.

7A42 Operators
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LIST OF ILLUST ATIONS
Figure
No. Page
1-1 7A42 re ease atch ...................................................................................... 1-3
1- 2 7A42 dimensiona drawing ..................................................................... 1-23
2- 1 Simpified b ock diagram of the 7A42 ...................................................... 2-2
2-2 Definition of the Booean AND, OR, NOT and XOR (EXCLUSIVE-OR)
ogic functions ............................................................................................. 2-3
2-3 Examp es of products of Channe 1 through 4 ....................................... 2-5
2-4 Function /and g OR'ed together ............................................................... 2-6
2-5 Examp e of EDGE Quaified TRIGGER FUNCTION .............................. 2-7
2-6 Exampe of A THEN B Nested Triggering ................................................ 2-8
2-7 7A42 contros, connectors, and indicators .......................................... 2-10
2-8 Se f-test in progress ................................................................................ 2-48
2-9 Se f-test finished ...................................................................................... 2-48
2-10 7A42 front-pane drawing showing pushbuttons and indicators
that are i uminated during the se f-test sequence ............................. 2-49
2-11 Typica sef-test faiure dispay .............................................................. 2-50
2-12 7A42 front-pane contro ights when initiaized ................................. 2-54
2-13 Channe readout dispay ......................................................................... 2-58
2-14 Channe readout disp ay with 10X probes attached to inputs
of CH1, CH2, CH3, and CH4 ................................................................. 2-58
2-15 Timing diagram showing the reationship of the TRIGGER OUT
waveform to the input signas ............................................................... 2-63
2-16 Timing diagram depicting the TRIGGER OUT waveform, as a
resut of the TRIGGER FUNCTION reacting to the input signa s ... 2-63
2- 17 Examp e of A THEN B, eve and EDGE sensitive TRIGGER FUNCTION,
showing the Norma and A THEN B Gate waveform aternatives ... 2-64
3- 1 Triggering on the decima “ 10" event ........................................................3-2
3-2 Dispay of four channes with TRIG VIEW trace ......................................3-3
3-3 Four channe disp ay with an externa c ock signa dispayed on the
TRIG VIEW trace .........................................................................................3-3
3-4 Triggering on a ow-ampitude puse ........................................................3-5
3-5 Timing diagram of a typica microprocessor read cyc e ....................... 3-6
3-6 Set up to monitor invaid data transitions .................................................3-8
3-7 The 7A42 captures a positive transition of data during the time data >
shou d be stab e .........................................................................................3-8
3-8 Bus contention measurement set up .................................................. 3-10 -
3-9 Standard 500-ohm probe forms vo tage divider with termination
resistor ..................................................................................................... 3-14
3-10 Simpified diagram of the P6230 Variabe Bias/Offset probe ........... 3-15 ;
3-11 Two ECL eve waveforms, A without bias offset, B with a -2 vot
bias offset ............................................................................................... 3-16
iv

7A42 Operators
LIST OF TABLES
Table
No. Page
1-1 Shipping Carton Test Strength ................................................................... 1-5
1-2 E ectrica Characteristics ............................................................................ 1-6
1-3 Environmenta Characteristics .............................................................. 1-21
1- 4 Physica Characteristics ......................................................................... 1-22
2- 1 7A42 Sef-Test Fai ure Messages ........................................................... 2-51
2-2 7A42 Front-Pane Contro Settings When Initiaized .......................... 2-53
2-3 7A42 Operator Message Summary ....................................................... 2-55
2-4 Channe Vots/Division Ranges ............................................................ 2-65

7A42 Operators
OPE ATO S SAFETY SUMMA Y
The genera safety information in this part of the summary is for both operating
and sevicing personne . Specific warnings and cautions wi be found throughout
the manua where they appy, but may not appear in this summary.
TE MS
IN THIS MANUAL
CAUTION statements identify conditions or practices that coud resut in damage
to the equipment or other property.
WARNING statements identify conditions or practices that coud resu t in persona
injury or oss of ife.
AS MA KED ON EQUIPMENT
CAUTION indicates a persona injury hazard not immediatey accessibe as one
reads the marking, or a hazard to property incuding the equipment itsef.
DANGER indicates a persona injury hazard immediatey accessibe as one reads
the marking.
SYMBOLS
IN THIS MANUAL
Static-Sensitive Devices
This symbo indicates where app icabe cautionary or other information
is to be found.
AS MA KED ON EQUIPMENT
DANGER — High votage.
Protective ground (earth) termina.
ATTENTION — refer to manua.

7A42 Operators
WA NINGS
POWE SOU CE
This product is intended to operate in a mainframe connected to a power source
that wi not appy more than 250 vots rms between the supp y conductors or
between either supp y conductor and ground. A protective ground connection by
way of the grounding conductor in the mainframe power cord is essentia for safe
operation.
G OUNDING THE P ODUCT
This product is grounded through the grounding connector of the mainframe
power cord. To avoid e ectrica shock, p ug the mainframe power cord into a
proper y wired receptac e before connecting to the product input or output
terminas. A protective-ground connection by way of the grounding conductor in
the mainframe power cord is essentia for safe operation.
DANGE A ISING F OM LOSS OF G OUND
Upon oss of the protective-ground connection, a accessibe conductive parts
(inc uding knobs and contros that may appear to be insuating), can render an
e ectrica shock.
DO NOT OPE ATE IN EXPLOSIVE ATMOSPHE ES
To avoid exp osion, do not operate this product in an atmosphere of exposive
gasses.
DO NOT OPE ATE PLUG-IN UNIT WITHOUT COVE S
To avoid persona injury, do not operate this product without covers or panes
insta ed. Do not appy power to the p ug-in via a pug-in extender.
vii

7M2 Operators
DESC IPTION
The 7A42 Logic Triggered Vertica Ampifier is a four channe, wide bandwidth,
p ug-in unit, compatibe with Tektronix 7000-series Osci oscopes. It was
specifica y designed to dispay and make measurements on digita ogic signas in
the TTL, ECL and CMOS ogic famiies. Whi e the dispay output from the 7A42 is
ana og, the trigger output is digita and is comprised of a user se ectab e Booean
function of the four input channes. A fifth TRIGGER VIEW trace depicts either the
trigger function output or the externa c ock input.
viii

SECTION ONE
GENERAL INFORMATION
Shown above is the Tektronix 7A42, 7A13, and 7B92A
insta ed in a Tektronix 7904A Osci oscope.
The 7904A is a genera purpose, rea -time 7000-series
mainframe, featuring a 300 MHz system bandwidth with
the 7A42.

SECTION 1 CONTENTS
1-0
COLOR USED IN THIS MANUAL .............................................................. 1-1
TECHNICAL MANUALS ................................................................................ 1-1
OPERATORS MANUAL ............................................................................. 1-1
SERVICE MANUAL .................................................................................... 1-1
INSTALLATION ...................................................................................................... 1-2
INITIAL INSPECTION .................................................................................... 1-2
OPERATING TEMPERATURE ....................................................................... 1-3
INSTALLING THE 7A42 IN THE MAINFRAME ......................................... 1-3
MAINFRAME COMPATIBILITY ..................................................................... 1-4
PACKAGING FOR SHIPMENT ..................................................................... 1-5
SPECIFICATION .......................................................................................................... 1-6
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 manuas, information on instrument insta ation, power requirements,
packaging for shipment, Standard Accessories, Optiona Accessories,
Specifications and a dimensiona drawing of the 7A42. The specification portion
consists of three tabes: E ectrica , Environmenta , and Physica Characteristics.
COLO USED IN THIS MANUAL
Red, green and ye ow co or is used in this manua to visua y correate the front 
pane indicators and markings to the descriptions of the text.
TECHNICAL MANUALS
An operators and two service manuas are suppied with your 7A42 as standard
accessories. The fo owing information out ines the content of these manua s.
Operators Manual
The Operators Manua is divided into the fo owing four sections:
Section 1 — GENERAL INFORMATION contains content descriptions of the
Operators and Service manuas, instrument description, mainframe and p ug-in
compatibiity, packaging instructions and instrument specifications.
Section 2 — OPERATING INSTRUCTIONS contains a b ock diagram
description, a front-pane drawing and brief description of contros, connectors
and indicators. Get-Acquainted Exercises provide a basic operating procedure
for the first-time user fo owed by a systematic demonstration of a front-pane
contro s. A detai ed description of a front-pane contros is aso given in this
section.
Section 3 — APPLICATIONS gives exampes of how to use the 7A42 to make
some difficut measurements.
Section 4 — INSTRUMENT OPTIONS contains a description of avaiab e
options.
Service Manual ___________
The following service instructions are for use by qualified personnel
only. To avoid personal injury, do not perform 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.
1- 1

General Information — 7A42
The service manua is divided into 2 vo umes. Voume 1 contains the fo owing:
Section 1 — GENERAL INFORMATION contains content descriptions of the
Operators and Service manua s, mainframe and pug-in compatibiity,
packaging instructions and instrument specifications.
Section 2 — THEORY OF OPERATION contains basic and genera circuit
anaysis that is usefu for servicing the instrument.
Section 3 — MAINTENANCE describes preventive maintenance procedures,
conventiona troubeshooting and diagnostic troubeshooting procedures with
detai ed instructions for repacing assembies, subassembies, and individua
components.
Section 4 — CHECKS AND ADJUSTMENT contains procedures to check the
operationa performance and e ectrica characteristics of the instrument.
Procedures aso incude methods for adjustment of the instrument to meet
specifications.
Section 5 — INSTRUMENT OPTIONS contains a description of avaiab e
options.
Section 6 — REPLACEABLE ELECTRICAL PARTS contains information
necessary to order rep aceab e parts and assembies reated to the e ectrica
functions of the instrument.
Section 7 — DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS inc udes
detai ed circuit schematics, ocations of assemb ed boards within the
instrument, votage and waveform information and circuit board component
ocators.
Section 8 — REPLACEABLE MECHANICAL PARTS inc udes information
necessary to order rep aceab e mechanica parts and shows expoded drawings
which identify assembies.
Voume 2 of the service manua contains signature ana ysis tabes to be used with
the diagnostic information provided in the Maintenance section of the Voume 1
service manua .
INSTALLATION
INITIAL INSPECTION
This instrument was inspected both mechanica y and eectrica y before shipment.
It shoud be free of mars or scratches and shoud meet or exceed a e ectrica
specifications. To confirm this, inspect the instrument for physica damage
incurred in transit and check the basic instrument functions by performing the
Get-Acquainted Exercises in Section 2, Operating Instructions. Quaified service
personne can verify Performance Requirements by referring to the Checks and
Adjustment section of the service manua . If there is damage or deficiency, contact
your oca Tektronix Fied Office or representative.
1-2

General Information — 7A42
OPE ATING TEMPE ATU E
The 7A42 can be operated where the ambient air temperature is from 0° to +50° C
and can be stored in ambient temperatures from 55° to +75° C. After storage at
temperatures outside the operating imits, a ow the chassis temperature to reach
operating imits before appying power.
INSTALLING THE 7A42 IN THE MAINF AME
The 7A42 is designed to operate in the two center or the two eft most p ug-in
compartments of a Tektronix 7000-series osci oscope mainframe.
NOTE
Switch off the mainframe power before installing or removing the
7 A 2.
To insta the 7A42 in the mainframe, aign the grooves in the top and bottom of
the instrument with the guides at the top and bottom of the pug-in compartment.
Then push the 7A42 in unti its front pane is f ush with the front pane of the
mainframe.
To remove the 7A42from its host mainframe, pu the re ease atch (see Fig. 1-1) to
disengage the unit from the mainframe, then pu the 7A42 straight out from the
p ug-in compartment eaving the mainframe on the bench.
4285-102
Figure 1-1. 7A42 release latch.
1-3

General Information — 7A42
MAINF AME COMPATIBILITY
The 7A42 is compatib e with a Tektronix 7000 series mainframes. In four-wide
pug-in compartment mainframes, it can be insta ed in either the two eftmost or
two centermost p ug-in compartments. When used in the two eftmost
compartments, se ect the Left Vertica Mode to dispay the ana og signa s. The
associated time base p ug-in Trigger Source shou d be Left Vertica with the time 
base trigger contros set to Auto or Norm, D C , Interna, S ope to +, with the Leve
contro centered. The A Then B Gate Output can be picked off from the RIGHT
VERTICAL TRIGGER SOURCE by a 7D11 or 7D15 from either horizonta
compartment. In three-wide p ug-in compartment mainframes, the 7A42 must be
used in the two eftmost compartments in a simiar way.
When the 7A42 is insta ed in the center two p ug-in compartments of a four
compartment mainframe; set the mainframe Vertica Mode and Trigger Source to
Right Vertica. The mainframe A Then B Gate Output can not be used in this
configuration, however, the A Then B Gate is sti avai ab e at the front-pane
TRIGGER OUT BNC connector.
Since a anaog channe s are sent out the 7A42's eft interface connector, it cannot
use the fu capabi ities of a dua beam osci oscope such as the 7844, R7844, and
the 7612D. However, it has fu compatibi ity with these mainframes in a singe
beam configuration.
Since the 7A42 uses the mainframe CRT readout to disp ay the channe vo ts 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 se ected as the Horizonta Mode, and if exact y four traces
are to be dispayed by the 7A42, two of the traces may synchronize to one time
base whie the other two traces synchronize to the other time base. To prevent this
from happening, one trace shoud be removed, or a fifth trace shou d be added to
the mainframe ert dispay (even if it is positioned off screen so it cannot be seen).
With one, two, three, or five traces, the channe dispay wi not synchronize to the
horizonta chop frequency.
The 7A42 is compatib e with the 7854 Osci oscope mainframe when the 7854 is
operated in rea-time. However, when the 7854 is operated in digita storage, and
waveform and readout acquisition is desired, the 7A42-7854 mode shou d be
seected, via an interna jumper; refer quaified service personne to the 7A42
Service manua. Once the 7A42-7854 mode has been seected, proper readout and
waveform acquisition can be guaranteed with the fo owing 7A42 dispay
conditions:
1. Any singe channe dispayed a one (CH1, CH2, CH3, CH4, or TRIG VIEW).
2. Channe s 1 and 2 ony dispayed together, ALT dispay mode seected.
3. Channes 3 and 4 ony dispayed together, ALT dispay mode seected.
Refer to the App ications section in this manua for further information.
1-4

General Information — 7A42
PACKAGING FO SHIPMENT
If this instrument is to be shipped by commercia transportation, we recommend
that the instrument be packaged in the origina manner. The carton and packaging
materia in which your instrument was shipped shou d be saved and used for this
purpose.
NOTE
Package and ship Plug-Ins and Mainframes separately.
If this instrument is to be shipped to a Tektronix Service Center for service or
repair, attach a tag to the instrument showing the fo owing: Owner of the
instrument (with address), the name of a person at your firm who can be
contacted, compete instrument type and seria number, and a description of the
service required.
If the origina package is unfit for use or not avai abe, package the instrument as
fo ows:
1. Obtain a corrugated cardboard shipping carton having inside dimensions at
east six inches greater than the instrument dimensions; refer to Tabe 1-1 for
carton test strength requirements.
2. Enc ose the instrument with poyethy ene sheeting or equivaent to protect
the finish of the instrument.
3. Cushion the instrument on a sides by tight y packaging dunnage or urethane
foam between the carton and the instrument, a owing three inches of
packaging on each side.
4. Sea the carton with shipping tape or with an industria staper.
5. Mark the address of the Tektronix Service Center and your return address on
the carton in one or more prominent ocations.
TABLE 1-1
Shipping Carton Test Strength
Gross Weight (lb)
Carton Test Strength (lb)
0 200
10-30 275
30-120 375
120-140 500
1-5

General Information — 7A42
SPECIFICATION
The e ectrica characteristics isted in Tab e 1-2 app y when the fo owing
conditions are met: (1) Adjustment of the instrument must have taken p ace at an
ambient temperature between +20° and +30° C, (2) the instrument is a owed a 20-
minute warm-up period, (3) specifications are va id at an ambient temperature of
0° to +50° C, un ess otherwise stated, (4) the instrument must be in an
environment that meets the imits described in Tabe 1-3, (5) the instrument must
be operated in a ca ibrated 7000-series mainframe.
Any app icab e conditions not isted above may be stated as part of the
characteristic. Environmenta characteristics are isted in Tab e 1-3 and Physica
characteristics are isted in Tab e 1-4.
TABLE 1-2
Electrical Characteristics
Characteristic Performance
Supplemental
equirement
Information
DISPLAY
Def ection Factor
Caibrated Range at
Input BNC Connector
TTL (CMOS)
Fami y
0.1, 0.2, 0.5 V/div.
ECL Fami y 20, 50, 100 mV/div.
Caibrated Range
through a 10X Probe
TTL (CMOS)
Famiy
1, 2, 5 V/div.
ECL Famiy
0.2, 0.5, 1 V/div.
Channe to Channe
Gain Match
Within 2% in ECL
Logic Famiy, 20 mV/
div, 1 Megohm
input impedance.
1-6

General Information — 7A42
TABLE 1-2 (CONT)
Electrical Characteristics
Characteristic
Performance
Supplemental
equirement Information
DISPLAY (CONT)
Defection Factor (cont)
Gain Ratio Accuracy
within the same
Channe
Within 2% of indi 
cated def ection
factor reative to
ECL Logic Famiy,
20 mV/div, 1 Megohm
input impedance.
GAIN Range
Permits adjustment of
def ection factor for cai 
brated operation with any
ca ibrated 7000-series
mainframe. Adjustabe at
east +4% to -4% from
ca ibrated setting.
Frequency Response
Bandwidth
350 MHz in 7104, 0°
- 35°C mainframe am 
bient temperature.
Refer to Tektronix
Product Cataog 7000-
Series Osci oscope
System Specification
for system bandwidths.
Input Signa) Dynamic
Range
Maximum Signa
Votage at tip of
10X Probe
TTL (CMOS)
Fami y
+ 30 V.
ECL Famiy
± 6 V.
Output Dynamic Range
Limited to the CRT
dispay area. Mainframe
Vertica Trace Separation
shou d not be used to
bring an off-screen
signa onto screen.
REV JUL 1984
1-7

General Information — 7A42
TABLE 1-2 (CONT)
Electrical Characteristics
Characteristic Performance
Supplemental
equirement
Information
DISPLAY (CONT)
Maximum Input Votage
1 Megohm
25 V ( DC + peak AC )
36 MHz or ess, derated
inear y to 3 V (peak
ac) at 300 Mhz.
50 Ohm
5 V RMS during any
1 ms time interva. Active
interna protection opens
a inputs if overvotage
is app ied to any channe.
50-Ohm Input Protec 
tion Reaction Time
Maximum time to open
input with appied
overvotage of:
10 V DC
10 seconds.
15 V DC
1 second.
20 V DC
0.5 second.
Input Characteristics
Input Couping
DC
Incoming signa is DC 
couped to the ampifier.
GND
A grounded input is
actua y open at the
input BNC, (i.e.,
1 Megohm or 50 Ohm
termination is dis 
connected). Interna y,
the ampifier input
is grounded to provide
a zero-vot input
reference.
1-8

General Information — 7A42
TABLE 1-2 (CONT)
Electrical Characteristics
Characteristic
Performance
Supplemental
equirement
Information
DISPLAY (CONT)
Input Characteristics (cont)
High Impedance
1 Megohm ±1%, in
para e with approx 
imatey 15 pF.
Low Impedance
50 ohms ±1 ohm at de.
VSWR
<1.15:1, DC to 300 MHz.
VOLTS/DIV Shift
0.2 divisions or ess
shift when VOLTS/DIV
is changed in either
TTL or ECL Fami ies
or between Famiies.
POSITION Range
At east +7 divisions
to -7 divisions but
ess than +9 divisions
to -9 divisions from
graticue center with
gain ca ibrated.
Dispayed Noise
Grounded input at
maximum sensitivity,
7A42 triggered on
another channe,
tested at 1 ms/div and
10 ns/div, not more
than 0.02 divisions
RMS, as measured in
a 7854.
DC Drift
Drift with Time
Not more than 0.2
divisions in any 10
minutes after twenty
minute warm-up
(ambient temperature
and ine vo tage
constant).
REV JUL 1984
1-9