Tektronix 7A18 Service manual

INSTRUCTION

7A18

IAi8/tA"%H

DUAL

TRACE

AMPLIFIER

7A18

TABLE

7A18

SECTION 1 SPECIFICATION Page OPTION INFORMATION

OF

CONTENTS

lntroduction
Electrical Characteristics
7A18 And Mainframe Frequency

Response 1-3
Environmental Characteristics 1-3
Physical Characteristics 1-3

SECTION

SECTION

SECTION 4 MAINTENANCE Accessories

2

OPERATING INSTRUCTIONS

Installation

Front Panel Controls and Connectors 2-1
General Operating Information
Basic Applications 2-4

3

CIRCUIT DESCRiPTlON

Introduction
Block Diagram Description

Detailed Circuit Description 3-1 Index

Preventive Maintenance
Troubleshooting
Replacement Parts
Component Replacement

I-

I

1-1 SECTION 6 ELECTRICAL PARTS LIST

Abbreviations and Symbols
Parts Ordering lnformation

SECTION 7

2-

1

2-2

SEC'TION 8 MECHANICAL PAR1'S LIST

3-1
3-1 Mechanical Parts List

4-3

4-4

CHANGE INFORMATION

DIAGRAMS AND CIRCUIT BOARD

ILLUSTRATIONS

Symbols and Reference Designators
Voltage and Waveform Conditions

of

Mechanical Parts Illustrations

Mechanical Parts List

Information

SECTION 5 CALIBRATION

Recalibration Interval 5-1 or taken directly from
'Test Equipment Required 5-1

I

-.-

Part
Part

Performance Check 5-3 the electronics industry. Change information, if any,

I

I

-

Adjustment

5-7

REV.

Abbreviations and symbols used in this manual are based on

IEEE Standard

Symbols for Units", MIL-STD-12B and other standards of.

located at the rear of this manual.

JUNE

1974

260

"Standard

is

7A18

Change information, if any, affecting this section will be found at the rear of the manual.

7A18

t

ntroduction

The 7A18 and 7A18N Dual Trace Amplifier plug-in

units are designed for use with
Oscilloscopes. The
tical except that readout encoding capabilities and an
"IDENTIFY" function are provided only in the
references made to the
unless othewise noted. The 7A18 is a dual-channel,
medium-bandwidth amplifier. Internal gain and compensa­tion circuits are automatically switched to correspond to

7A18 and 7A18N are electrically iden-

7A18 apply equally to the 7A18N

l-ektronix 7000-Series

7A18. All

TABLE 1-1

ELECTRICAL

i

wrViDiv

to

5

VIDIV;

the setting of the
inverted for differential measurements. The
operated in any plug-in
Oscilloscopes.

The following electrical characteristics are

stated environmental range for instruments calibrated at an

ambient temperature of
minute

tcrt

warmup unless otherwise noted.

step5

111

6

VOL-I"S/DIV

i-20"~ to +30°c, and after a five

I,

switch. Channel 2 can be

7A18 can be

compartment of the 7000-Series

valid over the

Deflectran

Uncalibrated

(VARIABLE)

GAlN

Frequency

Syslorn

(8

Dependent

dtv

refc~ence

Upper

DC

{Direct)

ower

Factor

Respar7se

stgnal)

Bandwrritlr

CuuplecJ

ljandwiclth

Accuracy

Vrrhrri

0

mV/Div,

:ontinuously
teps;

extends

East

12.5

-

296

ViDiv

with

GAlN

vat

iablc

deflection

adjusted

between

factor

at

cal~brart

tn

at

Pern-rits

for

cdlrbrdted

set

rcs

uscrltuzcopes,

adjustrrrcnt

or>erdtiot~

of

tic:flect~nn

wit17

all

factor

7000-

-

--

Specif ication-7A1817AI 8N

7A18

Characteristic

Maximum Input Voltage

DC Coupled

AC Coupled

Channel Isolation

Input R and

---

C

Resistance

Capacitance

RC

Product

Displayed

No~se

TABLE

""

Performance

1-1

(contj

Requiremen_t-.

-

---

--

-

-

--

Supplemental

Information

!50 volts, (DC + Peak AC); AC com­Ionent 500 volts peak-to-peak maxi­num. one kilohertz or less.

j00 volts, (DC + Peak AC); AC compo­lent 500 volts peak-to-peak maxi­num, one kilohertz or

less.

50: 1 display ratio up to 50

megahertz.

---

--

-----

Approximately 20.0 pf

---*-----~"."

Nithin

:k

.."."-"".----,-....-*-

1%

between

all

deflection

(Tangentially Measured)

".

"-

,"

......

Overdrive Recovery Time

Common Mode Rejection

Ratio

DC Drift

Dr~ft with Time (ambient
temperature and line voltage

constant)

Dr~fr w~th Temperature

(line voltage constant)

Time Delay between Channels

---

----

-

--

-*

----

-

Display Modes

--

---

-----

.,"-'"--

At least 10:

1

up to 59 megahertz.

-

Zhannel 1 only.
Dual-trace, alternate between channels.

Added

algebraically.
Dual-trace chapped between channels.
Shannel 2 only.

$00 microvolts or

less

at

5

mV/Div in

7000-Series Oscilloscope.

1.1 ms or

less

to recover to within one
livision after the removal of an over­jrive signal of up to -1-75 divisions or

-75 divisions regardless of overdrive

;ignal duration.

"

.,..----..-..-..

1.02 divisron

fter one hour

-

--

- - --

do

more than 0.01 d~vis~on per degree C.

'00 picoseconds or

~

or

less

warmup.

--

..-"

in

any one minute,

--

"-

less.

---

TABLE

7A18

7A78

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FRONT

AND

PAMEL

CONTROLS

CONNECTORS

r"lIS17

ION

Con

trcS5

llrrnrnrj

Wlsirlay

POSSTXUN

CIS.

Mode

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iihc

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Operating

7A18

Instructions--7A18/7A18N

VOLTSIDIV Selects calibrated deflection factors

from

5

mV/Div to 5 VIDiv; ten

steps in a

VARIABLE Provides continuously variable

(VOLTSiDI V) calibrated settings between cali-

brated steps. Extends the deflection
factor range to 12.5
or more.

GAlN Adjustment When the VARIABLE control is

pushed in,
screw-driver adjustment for cali­bration of deflection factor.

DISPLAY MODE Selects one of the following modes

of operation:
CH

ALT--A dual-trace display of the

ADD-Algebraically adds the signals

CHOP---A dual-trace display of the

CH single-trace display of the

TRIGGER SOURCE

Selects source of the trigger signal.
The trigger signals provide internal
triggering for the oscilloscope

base units.

CH

MODE-.-,I nternal trigger signal auto-

1-2-5 sequence.

un-

voltsidivision

it

becomes a front-panel

I.--A single-trace display of the

signal applied to Channel

signal applied to both channels.
'The channels are alternately dis­played, and switching occurs at
the end of each time-base
sweep.

applied to the CH 1 and CH 2

input connectors, and the
algebraic sum is displayed on
the CRT. The CH 2 POLARITY
switch allows the display to be

+

CH 1
Position of the trace in this dis-

play mode is controlled by CH 1

POSITION control only.

signals applied to both channels.

The two channels time-share the

sweep as determined by the in-

dicator oscilloscope.

signal applied to CH 2.

obtained from signal applied to

CH

matically follows DISPLAY

MODE selection. In ADD or

CH 2 or CH

1

-

i nternal triggering signal

1.

1

1.

-

CH 2.

time-

CHOP display modes, the trigger
signal is the algebraic sum of CH

1

and CH 2 trigger.

CH 2---Internal trigger signal

obtained from signal applied to
CH 2.

CH 2 POLARITY

Provides

-WP--.A positive-going signal at the

INVERT--.A positive-going signal at

means of inverting the CH

2 display.

CH

2

input connector deflects

the

CRI

display upward.

2

the CH
flects the CRT display down­ward.

input connector de-

GENERAL OPERATING INFORMATION

Introduction

For single-trace operation, either of the two identical
amplifier channels can be used independently by setting the
DISPLAY MODE and TRIGGER SOURCE switches to CH

1 or CH 2 and connecting the signal to be observed to the

appropriate input. In the discussions to follow, single-trace

1

operations using CH

only apply equally to CH 2 only.

Signal Connections

In general, probes offer the most convenient means of
connecting a signal to the input of the
uator probe offers a high input impedance and allows the
circuit under test to perform very close to normal operating
conditions.

The Tektronix
ring, was designed specifically for use with 'Tektronix 7A­series amplifier units equipped with readout. The readout

coding ring on the probe connects to
fier unit which automatically corrects the readout displayed

on the CRT to the actual deflection factor at the tip of the
probe being used. For probes to be used with amplifier
units without readout, see the Tektronix, Inc. catalog.

P6053A probe, with its readout coding

7A18. A 10X atten-

a

circuit in the ampli-

Vertical Gain Check and Adjustment

TO check the gain of either channel, set the VOLTSlDfV
switch to 10 mV and connect
oscilloscope calibrator to the input connector of the chan­nel being checked. The vertical deflection should be exactly

four divisions. If not, adjust the front-panel GAIN for
exactly four divisions of deflection. The

is

engaged by pressing in the GAIN control knob and turn-

ing the knob with a narrow-blade screwdriver (see Front

40

mV, 1 kHz signal from the

GAlN adjustment

Operating

7A18

Instructions--~7A'18/7A18N

Panel Controls and Connectors), Turn the knob clockwise,
then counterclockwise, until the GAIN control is engaged.
When the
will change as the knob is turned.

knob with the screwdriver until the deflection is set to

exactly four divisions, then remove

GAIN control is engaged, the vertical deflection

Turn the GAIN control
the screwdriver.

Input Coupling

The Channel 1 and Channel 2 coupling (AC-GND-DC)
switches allow a choice of input coupling methods. The
type of display desired and the applied signal will determine
the coupling to use.

DC coupling position must be used to display the

The

It

DC component of the signal,

AC signals below about

probe) and square waves with low-frequency components as
these signals are attenuated in the AC position.

In the AC coupling position, the DC component of the

is

signal
coupling position provides the

DC component much larger than the AC components. The

precharge feature should be used with large DC inputs.
use this feature, first set the coupling to GND. Connect the
probe to the circuit and wait about two seconds for the
coupling capacitor to charge. Then set the coupling to AC.

input of the amplifier
input connectors. However, the signals connected to the
inputs are not grounded, and the same DC load is presented
to the

blocked by a capacitor in the input circuit. Ihe AC

The GND position provides a ground reference at the

signa! source.

must also be used to display

30

hertz (ten hertz with a

best display of signals with a

without externally grounding the

10X

70

VOLTSIDIV and VARIABLE Controls

The amount of vertical deflection produced by a signal is

determined by the signal amplitude, the attenuation factor

of the probe, the setting of the

the setting of the

tion factors indicated by the settings of the
witch apply only when the VARIABLE control is in the

calibrated (CAL IN) position.

The VARIABLE control provides variable, uncalibrated
settings between the calibrated steps of the
switch. With the VARIABLE control fully counterclock-

wise and the

brated vertical deflection factor

volts/division. By applying a calibrated voltage source to
the input connector, any specific deflection factor can be
set within the range of the VARIABLE control,

VARlABLE control. Calibration deflec-

VOtTSlDlV set to 5 voltsldiv the uncali-

VOLTSlDlV switch, and

VOLTS/DIV

VOLTS/DIV

is

extended to at least 12.5

CH

2

POLARITY

2

The CH
displayed waveform of the signal applied to the CH
This

is

when differential measurements are to be made. The CH
POLARITY switch has two positions, +UP and INVER1. In

+UP position, the displayed waveform will have the

the
same polarity as the applied signal and a positive
will move the CRT trace up. In the INVERT position,
positive-going waveform at the CH 2 input will be displayed
on the CRT in inverted form and a positive
move the trace down.

POLARITY switch may be used to invert the

particularly useful in added operation of the 7A18

Switch

2

input.

2

DC voltage

a

DC voltage will

DISPLAY MODE Switch

For single-trace operation, apply tire signal either to the

1

inpttt or the CH 2 input and set the DISPLAY MODE

CH

f

or CH

switch to the corresponding position: CH

To display a signal in one channel independently when a
signal is also applied to the other channel, simply select the
desired channel by setting the DISPLAY MODE switch to

1

the appropriate CH

Alternate Mode. The

MODE switch produces a display which alternates between

channel 1 and channel

Although the ALT mode can be used at all sweep rates, the
CHOP mode provides a more satisfactory display at sweep
rates below about
rates alternate mode switching becomes visually per-

ceptible,

or CH 2 position.

ALT

position of the DISPLAY

2

with each sweep on the CRT.

0.2

millisecond/division. At slow sweep

Add Mode. "The ADD position of the DISPLAY MODE

switch can be used to display the sum or difference of two
signals, for common-mode rejection to remove an undesired

signal, or for DC offset (applying a DC voltage to one
channel to offset the DC component of a signal on the
other channel). The overall deflection factor in the ADD

mode with both

position is the deflection factor indicated by either
VOLTS/DIV switch. However, if the CH 1 and CH

VOLTSlDIV switches are set to different deflection factors,

the resultant amplitude is difficult to determine from the
CRT display. In this case, the voltage amplitude of the

resultant display can be determined accurately only if the
amplitude of the signal applied to one channel is known.

the ADD mode, positioning of the trace is contro:led by the

1

channel

Chop Mode.
MODE switch produces a display which
switched between channels at approximately a
hertr rate (controlled by mainframe). In general the CHOP
mode provides the best display at sweep rates slower than

POSITION control only.

VOLTSlDIV switches set to the same

The CHOP position of the DISPLAY

2.

is

electronically

500

2

In

kilo-

REV.

APR

1974

2-3

Operating

7A18

about
repetitive phenomena is to be displayed.

instructions~--7Al8/7A18N

0.2

miilisecondIdivision or whenever dual-trace, non-

TRIGGER SOURCE Switcl~

CH

1.

'The CH 1 position of the 1-RIGGER SOURCE

switch provides a trigger signal obtained from the signal

1

applied to the CH
display of the signal applied to the CH

CH

2.

The CH 2 position of the TRIGGER SOURCE
switch provides a trigger signal obtained from the signal
applied to the CH
display of the signal applied to the CH

MODE. In this position of the TRIGGER SOURCE
switch, the trigger signal for
on the setting of the DISPLAY MODE switch. The trigger
source for each position of the DISPLAY MODE switch is
as follows:

MODE TRIGGER

CH

1

CH

2

ADD Algebraic sum of channel 1 and channel
CHOP Algebraic sum of channel 1 and channel
A LT Alternates between channel 1 and channel

inp~~t connector. This provides a stable

1

input connector.

2

input connector. This provides a stable

2

input connector.

the time-base unit is dependent

Channel
Channel

SIGNAL

1

2

SOURCE

2

2

2

2.

Set the DISPLAY MODE and TRIGGER SOURCE

switches to display the channel used.

3.

Set the co~lpling switch to AC.

For low-

the

4.

divisions of the waveform vertically.

5.

play. Set the time-base unit to a sweep rate which displays
several cycles of the waveform.

6.

tion of the waveform coincides with one of the

lines below the center hori~ontal line, and the top of the
waveform is within the viewing area. With the time-base
Position control, move the display so one of the upper
peaks lies near the center vertical line (see Fig.

7.

peak. Check that the VARIABLE

in the CAL IN position.

frequenc y signals helo w about

DC

position to prevent attenuation of the signal.

Set the VOL'T'SIDIV switch to display about five

Set the time-base Triggering controls for a stable dis-

Turn the 7Af8 POSITION control so the lower por-

Measure the divisions of vertical deflection peak-to-

(VOLTSIDIV) control is

30

hertz use

2-2).

graticuie

'Trace Identification (7A18 only)

When the IDENTIFY button is pressed, the trace

0.2

flected about
feature is particularly useful when multiple traces are dis­played.
tion factor readout with the word "IDFNTIFY".

In instruments with readout, also replaces deflec-

division to identify the 7A18 trace. This

is

de-

BASIC APPLICA'TIONS

General

The following information describes the procedures and
techniques for making basic
the associated Tektronix oscilloscope and time-base.
applications are not described in detail since each applica­tion must be adapted to the requirements of the individual
measurements. This instrument can
applications not described in this manual. Contact your

'l-ektronix Field Office or representative for assistance

local
in making specific measurements

meastlrerrlents with a 7A18 and

These

also be used for many

with this instrument.

Peak-to-Peak Voltage Measurements (AC)

To

make peak-to-peak voltage measurements,

following procedure:

I.

Apply the signal to either input connector

use the

NOTE

This techrtique can also be used to make measore-

ments between two points on the wavefom, rather

titan peak to peak.

Ftg.

2-2.

Measurtng the peak-to-peak voltage of a waveform.

8.

7A18

Multiply the deflection measured in step 7 by the
VOLTSiDlV switch setting. Include the attenl~ation factor
of the probe if used.

Operating

7.

Measure the distance in divisions between the

reference line

DC

level

measurement is between the reference line and point A.

anrf the point on the waveform at which the

is

to be measured. For example, in Fig.

Instrtictions--7Al8/7A18N

2-3

the

EXAMPLE: Assume that the

is

flection
uator probe, and the VO LTSIDIV switch is set to 1 V.

Peak to Peak

Substituting the given values:

The peak-to-peak voltage is 45 volts.

Instantaneous Voltage Measurements (DC)

Po measure the

proceed as follows:

1.

2.

switches to display the channel used.

3.

divisions of

4.5 divisions (see Fig.

Volts

Connect the signal to either- input connector.

Set the DISPLAY MODE and TRIGGER SOURCE

Set the VOLTSIDIV switch to display about five

vertical probe

-

deflection X
(divisions) factor

Volts Peak-to-Peak

DC

level at a given point on a waveform,

the waveform.

peak to peak vertical de-

2-2)

'OL

=

4.5 X

rS'DIV

setting

using a

1

X

x

10

10X

attenuation

atten-

8.

Establish the polarity of the waveform. With the
POLARITY switch in the +UP position, any point above
the reference line is ~ositive.

9.

Multiply the distance measured in step 7 by the

VOLTS/DIV setting. Include the attentlation factor of the

if

probe,

divisions (see Fig.
reference line usinq a
of 0.5 V.

Using the formula:

Instan- vertical VOLTS! probe
taneous
Voltage (divisions) setting factor

Substitllting

used.

EXAMPLE: Assume

2-3)

=

distance X polarity

given

Instantaneous

Voltage

the vertical distance measured is

and the waveform is above the

10X probe wit11 a VOLTSIDIV setting

X

DIV X attenuation

values:

3.6

X i 1

X

0.5

V

X

CH

3.6

10

2

4. Set the couplinq switch to GND and
trace to
the voltage
trace to the top
control after this reference line has been establ~shed.

line can be checked at any time by
position.

display. Set the time-base sweep rate for an
display of the waveform.

thc lnottom graticule line or other reference line. If

is

ncqative with respect to ground, position the

graticitle line. Do not move the POSl PION

NOPE

Po

n~easrire a voltage Icvel with respect to a voltage

orher ti~afi grout?d,

step

4.

Set tl?~ COLI/?IIII~ switch to DC ar~d

reference voltage to the inpiit connector. Then

position the trace to the refere17ce ltne.

5.

Set the coupling switch to DC. The ground reference

6.

Set the time-base

make

the followirig c/)at?ges

sw~tclr~nq to the GND

'I

r~ggering controls for a stable

pos~tion the

apply

optinium

to

tlte

The instantaneous voltage

Fig.

2-3.

ence.

Measuring instantaneous voltage

1s

18

volts.

with

respect

to

some

refer-

Operating Instructions-7Al8/7A18N

7A18

Comparison Measurements

In some applications it may be desirable to establish

arbitrary units of measurement other than those indicated

VOL-ISiDIV switch. This is particularly useful when

by the

a

comparing unknown signals to
use for the comparison-measurement
facilitate calibration of equipment where the desired
arnplitude does not produce an exact number of
of deflection. The adjustment will be easier and more
accurate if arbitrary units of measurement are established
so that the correct
number of divisions of deflection. The following procedure

describes

conlparison measurcmc?nts.

To estatrtlish an arbitrary vertical deflection factor- based

upon a specific refert?ncc amplitude, proceed as follows:

1. Connect the reference signal to the input connector.

Set the rime-base

tile signal.

of

2.

control to produce a display
vertical
VARIABLE control

3. To

the amplitude of an unknown signal can he measured
accurately at any setting of the
ai-nl,litude of the t-eierence signal must be icnown. If it is
not known, it
VOLTS'DIV control is set in step

how to establish arbitrary units of measure for

Set tile VOLTS'DIV switch and the VARIABLE

div~sions in atnplitude. Do not cf.tange the

estat,lish an arbitrary vertical deflection factor so

adjiistment is indicated by an exact

unit sweep rate to display several cycles

after obta~nrng the desiretl cfeflect~on.

can

be

measured before the VARIABLE

reference arnpiitcide. One

technitlue is to

which

is

an exact number of

VOLT-S/DIV switch, the

2.

tlivisions

Signal VOLT'SIDIV vertical vertical

Amplitude

EXAMPLE: Assume

volts, a

control
divisions. Substituting these values in
conversion factor formula (step

]-hen with a VOLTS/DIV setting of 2 V, the
peak to-peak amplitude of an unknown signal which
produces a vertical deflection of five divisions can be
determined by using

-

setting X conversion X deflection

factor (divisions)

a

reference signal atnplitude of 30

VOLTSIDIV setting of 5 V and the VARIABLE

adjusted to provide a vertical deflection of four

tlie vertical

4)

:

2

-

V X

30 V

4 X 5

1.5

V = 1.5

X

5

=

15

6):

volts

Vertical

Conversion

Factor

Signal

Amnlitude

tlie signal amplitut.le formilla (step

=

Dual-Trace Phase Difference Measurements

Phase conlparison between two signals of the same fre­quency can be made
7A18. 'Th~s method of phase dilference measurement can
be used
system. To make the comparison, use the following pro­cedure:

position, clepending on the type of

up to the frequency limit ot the oscilloscope

1.

Set the CH 1 and CH 2 coi~pling switches to the same

using the dual-trace feature of the

cot~plir~g desired.

4.

Divide the atnplitude of the reference signal (volts) by

the product of tho vertical deflection (divisions) established

2

in step
the vertical conversion factor. TRIGGER SOURCE to CH 1.

disconnect the
signal to the input connector. Set the
to a setting that provides sufficient vertical cleflection to
make an accurate measurement. Do not readjust the
VARIABLE control.

6.

calculate the amplitude of the unknown signal using the controls of the two channels so the displays are equal and

following

and the settirig of the VOLTS/DIV switch. 1-his is ALT is more suitable for high frequencies. Set the

Vertical reference signal

Conversion amplitude (volts)

Factor vert~cal VOLTSIDIV

5.

To measure the amplitude of an unknown signal,

Measure the vertical deflection in divisions and 5. Set the VOLTS/DIV switches and the VARIABLE

formula. about five divisions in amplitude.

--

-

.-

--

--

-

deflection
(divisions) setting

reference signal and connect the unknown

X

-

--

switch

VOLTSI'DIV switch

2.

Set the DISPLAY MODE to ALT or CHOP. In

general, CHOP is more suitable for low frequencies and

3.

Connect the reference signal to the CH 1 input and

2

the comparison signal to the CH
or probes which have similar time delay characteristics to
connect the signals to

4.

If the signals are of opposite polarity, set the CH

POLARITY switch to invert the channel 2 display.

(Signals may be of opposite polarity due to

difference; if so, take this into account in
culation.)

the input connectors.

input. Use coaxiat cables

180' phase

the

final cal-

2

Operating

7A18

Instructions--7A18/7A18N

6. Set the time-base unit to a sweep rate which displays

about one cycle of the waveforms. Set the Triggering

controls for a stable display.

7. Center the waveforms on

POSFTION controls.

the graticule with the 7A18

Substitiitinq the given values:

Phase Difference

The phase difference is 13.5".

-

0.3 X 45"

High Resolution Phase Measure~nents

8. Adjust the time-base Variable TitneiDiv control until
one cycle of the reference signal occupies exactly eight
horizontal divisions between the second and tenth vertical
lines of the graticule (see Fig.
graticuie represents
45"idivision). The sweep rate can now be stated in terms of
degrees as

sponding points on the waveform.

45Oidivision to obtain the exact amount of phase dif- zontal difference of 3 divisions, tile phase difference is.
ference.

sion with a sweep rate

45'/division.

9.

Measure the horizontal difference behveen corre-

10. Multiply the measured distance (in divisions) by Fig.

EXAMPLE: Assume a horizontal difference of 0.3 divi- Phase Difference

45O

of

of

2-4).

Each division of the

the cycle (360°

45°/division as shown in

+

8

divisions

=

Fig.

2-4. (divisions) (cfegreesi'division)

More accurate dual-trace phase
made by increasing the sweep rate
Variable

crease the sweep rate is
Set the Magnifier to

sweep rate
by the amount of sweep magnification.

the Magnifier, the magnified sweep rate is

-

TirneIDiv control). One of the easiest ways to in-

with the time-base Magnifier switch.

XI0

and determine the magnified

t~y dividing the sweep rate obtained previously

EXAMPLE. If the sweep rate is increased 10 times by

4.5°/division. Fig. 2-5 shows the same signals as used in
2-4 but with the Magnifier set to X10. With a iiori-

horizontal magnified

-

difference

measuremenis can be

(witho~lt changing the

45Oidivision : 10

X

sweep rate

Using the formula:

Phase Difference

Substiti~tintj the given values:

hori7ontal sweep rate Phase Difference - 3 X 4.5"

-

difference X (degrees/division)

(divisions) The phase difference is 13.5".

Fig.

2-4.

Measuring phase difference between two signals.

Fig.

f

ier.

2-5.

High resolution phase measurement using time-base

magrii-

2-7

Operating

7A18

Instructions--7A18/7A18N

Common Mode Rejection

The ADD feature of the 7A18 can

signals

which contain undesirable components. These un­desirable components can be eliminated through common­mode rejection. The procedure is as follows:

1.

Set the DISPLAY MODE s~zlitcli to ALT or CHOP

and the TRIGGER SOURCE switch to MODE,

be

used to display

2. Connect the signal containing

undesired information to the CH

3.

Connect a signal similar to the unwanted portion of

both the desired and

1

input connector.

tlie CH 1 signal to the CH 2 input connector. For example,

2-6

a

in Fig.

line-freclcrency signal is connectetl to Channel

to cancel out the line-frequency component of the Channel

1

signal.

4.

Set botii coupling switches to the same setting, DC or

depericling on the applied signal.

AC,

5.

Set the VOLTS/DIV switches so the signals are about

equal in amplit~~de.

6.

Set tlie DISPLAY MODE switch to ADD. Set the CH

2

POLAR1 rY switch to INVERT so the common-mode

sign;ils are

7,

VAR

of

opposite polarity.

Adjust the Channel

l

ABLE

control for maxiinurn cancellation of the

2

VOLTSiDlV switch and

cor~7mon-i~lode signal. The signal which remains shocrld be

tlie

only

desired portion of the Channel 1 signal.

2

EXAMPLE: An example of this mode of operation is

shown in Fig.

2-6. The signal applied to Charinel 1 contains
unwanted line frequency components (Fig. 2-6A). A corre­sponding line frequency signal is connected to Channel
(Fig. 2-GB). Fig. 2-6C shows the desired portion of tlie
signal as displayed when common-mode rejectioli

The

above procedure can also be used for examining a

siiperimposed on some DC level when DC coupling is

signal

is

used.

usecf. A DC voltage of the Proper polarity
Channel 2 can be used to cancel out the DC portion of the
signal applied to Channel

1.

2

Fig.

Channel
frequency component.

(Cf

~estrltant

2-6.

Using the

3

CRT

ADD

mode for common-mode rejection.

contains desired information along with line-

(B)

Channel 2 contains line frequency only.

display using common-mode rejection.

(A)

Change information, if any, affecting this section will

7A18

be

found at the rear of this manual.

l

ntroduction

This section of the manual contains a description of the

circuitry used in the

tion begins with
block diagram shown in the Diagrams section. 'Then, each

circuit is described in detail using block diagrams to show

the interconnections between stages in each major circuit

and the relationship of the front-panel controls to the indi­vidual stages.

Complete schematics of each circuit are given in the
Diagrams section. Refer to these schematics throughout the
following circuit description for electrical values and
relationship.

7A18 dual-trace amplifier. The descrip-

a

discussion of the instrument using the

BLOCK DIAGRAM

The following discussion
standing the overall concept of the 7A18 before the indivi­dual circuits are discussed in detail. Only
connections between the individual blocks are shown on
the block diagram (see Diagrams section). Each block
represents a major circuit within the instrument. The
number on each block refers to the schematic on

is

complete circuit

The signal to be displayed on the CRT is applied to the

input connector. The signal passes through the input
coupling switch, where the appropriate coupling
to the attenuators. The
correct amount of attenuation and the signal
the input amplifier.

The Channel

setting, variable gain control, and trace positioning. The

2

Channel
in addition to gain setting, variable gain control, and trace
positioning. The outputs of these circuits are applied push­pull to the Signal and Trigger Channel Switches.

The Channel Switches select the proper signal and trigger

as determined by the DISPLAY MODE and TRIGGER

Input Amplifier provides signal polarity inversion

found.

1

Input Amplifier circuit provides gain

is

provided to aid in nnder-

the basic inter-

which the

is

selected,

VOLTSIDIV switch selects the

is

passed to

SOURCE switches. The signal and trigger outputs are
provided to the oscilloscope via the Interface Connector.

The Readout Encoding circuit
readout logic for the oscilloscope readout system. Data
supplied to the mainframe readout system identifying the
polarity, deflection factor, the uncalibrated symbol (when
the VARIABLE control is in the outward position), and the
plug-in mode. When the
trace is deflected about
factor readout is replaced by the word

IDEN-SIFY button

0.3

(7A18 only) provides

IS

pressed, the

division and the deflection

"IDEN1-IFY".

DETAILED CIRCUIT' DESCRIP'TION

ATTENUATOR

General

The Attenuator circuit determines the input coupling

and the 7A18 deflection factor.

NOTE

The

Cff

I

and

Cff

2

Attentlator circuits are identicai.

To minimize duplication, only

detail

throi~ghout tt~is discussion.

CH

7

is

described in

AC-GND-DC Switch

Input signals connected to the input connector can be
AC-coupled, DC-coupled, or internally disconnected.
SlOOA is a cam-type switch; a contact-closure chart

is

showing the operation
this chart indicate when the associated contacts are
position
switch
directly to the input Attenuator stage. In the AC position,
the input signal passes through capacitor
acitor prevents the DC component of the signal from
passing to the amplifier. The
path and connects the input circuit of the amplifier to
ground. This provides a ground reference without the need
to disconnect the applied signal from the input connector.
Resistor

allows
trace remains on screen when switching to the AC position

if the applied signal has a high DC level.

shown (open or closed). When the AC-GND-DC

is

in the DC position, the input signal

R

102, connected across the AC-GND-DC switch,

C10 to be precharged in the GND position so the

given on Diagram

GND position opens the signal

1.

The dots on

III

the

is

cot~pled

C10. This cap-

IS

Circuit Description--7A18/7Al8N

7A18

lnput Attenuator

The ef.fective overall deflection factor of the 7A18 is
determined by the setting of the
SIOOB. The basic deflection factor
sion of CRT deflection. To increase the basic deflection
factor to the values indicated on the front panel, precision
attenuators are switched into the circuit. These attenuators

are hybrid devices which contain the necessary resistances
and capacitors. Each attenuator is

SIOOB is a cam-type switch and the dots on the
closure chart (see Diagram 1) indicate when the associated
contacts are in the position shown (open or closed). In the

5

mV/Div position, input attenuation

signal is connected directly to the input amplifier.

For switch positions above five millivolts, the
uators are switched
produce the deflection factor indicated on the front panel.
These a
dividers. For DC and low-frequency signals, the attenuators
are primarily resistance dividers and the voltage attenuation
is determined by the resistance ratio in
reactance of the capacitors in the circuit
frequencies that their effect
higher frequencies, the reactance of the capacitors decreases

and the attenuator becomes primarily a capacitance divider.

frequencies within

input attenuators are designed to maintain the same input
RC characteristics (one megohm

of the
adjustable series capacitor to provide correct attenuation at
high frequencies and an adjustable shunt capacitor to pro-

vide correct input capacitance.

ttenuators are frequency-compensated voltage

In addition to providing constant

VOLTS/DIV switch. Each attenuator contains an

into the circuit singly or in pairs to

the bandwidth of the instrument, the

CHANNEL

VOLTSIDIV switch,

is

five millivolts per divi-

replaceahie as a unit.

is

not used; the input

the circuit. The

is

is

negligible. However, at

atLenuation at all

X

20 pF) for each setting

contact-

so high at low

1

atten-

INPUT AMPLIFIER

General

The Channel 1 lnput Amplifier converts the single-ended
signal applied to the Channel 1 input connector to a dif­ferential (push-pull) output. Fig. 3-1 shows a detailed block

diagram of the Channel 1 lnput Amplifier. A schematic of

this circuit is shown on Diagram 2 in the Diagrams section.

lnput Source Follower

The Input Source Follower Q210A provides a high input
impedance with a low impedance drive for the following

stage.

R210 limits the current drive to the gate of Q210A.

Dual-diode CR210 provides circuit protection by limiting

the voltage swing at the gate of
or negative) 15 volts.

Q210B provides a constant current

0210A to about 4 (positive

source for
the same case so that
circuit.

0210A. 0210A and Q210B are encapsulated in

0210B temperature-compensates the

Paraphase Cascode Amplifier

Paraphase amplifier 0220-0320, in conjunction with
0225-0325, forms a
the single-ended input signal to a differential output signal.
Diodes
0220 close to ground to limit the voltage swing to about

40.6

isolation between the paraphase amplifier and the

VARIABLE controls. 'Phe gain of the Channel 1 lnput
Amplifier is set in this stage by front-panel

R237A with the CAL IN switch pressed in. When the CAL
IN switch is in the outward (uncalibrated) position and

turned fully
gain of the amplifier is reduced by a factor of at least 2.5.
Adjustment 1 R321 varies the base level of Q320 to provide
the same voltage levels at the collectors of
This prevents a
position when varying the

CR220-CR221 hold the voltage level at the base of

volt. Common-base connected 0225-Q325 provide

co~~nterclockwise to minimum resistance, the

cascode amplifier. Q220-Q320 convert

GAIN-

GAlN control

(2225 and 0325.

rerouolt reference trace from changing

GAlN or VARIABLE controls.

Second Cascode Amplifier

The Second Cascode Amptifier stage provides a signal
gain of
TION control and, in the

circuitry. The emitters of common-base connected
(2250-0350 provide a low-impedance point for injection of

the POSITION control and

Position of the trace is determined by the setting of the
POSITION control, R 11. This control changes the current
drive to

impedance point in the circuit, there
change at these points. However, the change in current
from the
voltage difference at the collectors to change the position
of the trace. Trace identification is accomplished by

inserting resistor R357 from ground through
junction of
the emitter current of Q250 to cause the trace to move.
This aids in identifying the channel 1 trace when multiple
traces are displayed.

vides high frequency compensation.
work provide high-frequency response adjustment for this
stage.

approximateiy two. This stage includes the POSI-

7A18 only, trace IDENTIFY

IDENrlFY switch currents.

Q250-0350. Since the emitters are a very low-

is

negligible voltage

POSI1"ION control produces a resultant DC

CR357 to the

R11-R256. This results in a slight increase in

The network

C246-C345-C245-R246-R345-R245

R245-C245 in this net-

pro-

Emitter Follower

Emitter Follower stage 0260-(2360 provides a low out-

put impedance to drive the Signal and Trigger Channel
Switches,

between the Second Cascode Amplifier and

U270-U470. This stage also provides isolation

U270-U470.

Circuit Description-7Al8/7A18N

7A18

Fig.

3-1.

Channel 1 lnput Amplifier detailed block diagram.

CHANNEL 2 INPOUAMPLIFIER

General

The Channel 2 lnput Amplifier circuit

1

same as the Channel

lnput Amplifier circuit. Only the
differences between the two circuits are described here.
Portions of this circuit not described in the following des­cription operate in the same manner as for the Channel

lnput Amplifier circuit (corresponding circuit numbers

assigned in the

400 599

block diagram of the Channel

schematic of this circuit

range). Fig.

2

lnput Amplifier circuit. A

is

shown on Diagram 3 in the

Diagrams section.

is

basically the

3-2

shows a detailed

Paraphase Cascode Amplifier

The Paraphase Cascode Amplifier for Channel 2 consists

of

Q420, Q520, (3425, Q525,0426,
to the functions described under Channel
fier, the Channel
provides a means of inverting the displayed signal. With the

1

CH

2

POLARI1-Y switch set to

biased on and the signal

Amplifier stage as for the Channel

CH

2

the

Q525

POLARITY switch set to

are biased off and

provide signal inversion.

CHANNEL

-+

and

Q526.

2

Paraphase Cascode Amplifier stage

+UP,

0425

is

passed to the Second Cascode

1

lnput Amplifier. With

INVERT,

Q426-Q526

are turned on to

SWITCH

U470

In addition

1

lnput Ampli-

and

0525

Q425

are

and

FROM

INPUT

ATTEN

REV.

D, DEC.

1976

PARAPHASE

Fig.

FROM

S23

17A18

ontv)

3-2.

Channel 2 lnput Amplifier detailed block diagram.

TO

SIGNAL

GMANNEL

SWITCH

U270

CHANNEL

SWiTCW

U470

Circuit Description-7Al8/7A18N

7A18

Second Cascode Amplifier

Ttie Second Cascode Amplifier for Channel 2 consists of
0440, 0540,
by the POSITION control, R21 or by network R455-H555
as determined by the DISPLAY MODE switch. In any DIS­PLAY MODE switch position other than ADD,
applied to the center arm of the POSl I^ION control through
R32. The POSITION control varies the current drive to the
emitters of
impedance point in the circuit, there is negligible voltage
change at these points. However, the change in current
from the POSITION control produces a resultant DC
voltagt-: difference at the collectors to change the position
of the trace. When the DISPLAY MODE switch is in the
ADD position, +50 volts
tors

R455-R555 through R32 to balance the current drive

to the emitters of

volts (approximately) difference between the collectors.

Since +50 volts is not applied to the
the ADD position of the DISPLAY MODE switch, the

control setting has no

Q450, and Q550. Position of the trace

Q450-0550. Since the emitters are a very low-

is

applied to the junction of resis-

(2450-0550. This results in a fixed zero

POSII-ION control in

effect on the circuit operation.

i

50 volts

is

set

is

CHANNEL SWITCHES

General

Ttie Channel Switches circuit provides Signal and Trigger
outputs to the oscilloscope via the
determined by the DISPLAY MODE and
SOURCE switches. A schematic of this circuit is given on
Diagram 4 in the Diagrams section.

Interface Connector as

THIC<GER

Signal Channel Switch

The Signal Channel Switch stage consists of integrated

circuit

U270 and its external components. This staqe selects

one, or mixes two input analog signals in response to inputs

from tlie DISPLAY MODE switch. The Signal Cliannel

Switch stage determines which input (CH 1 or CH 2) pro­vides

the signal to the oscilloscope as controlled by the
DISPLAY MODE switch setting. Resistors
R376-R377 set the current gain for each channel. Networks

C274-R274-C215-R275 and C374-R374-C375-R375 pro- vide the DC level shifting necessary to drive the
vide high-frequency compensation for each channel. C275
and

C315 in these networks are high-frequency compen.

sation adjustments.

R276-R277 and

DISPLAY MODE

SELECTED

*Level is switched between the HI-level and LO-level

0.5

mate
**Level is switched between the Hl-level and LO-level at a rate

determined by the setting

megahertz rate.

of

the time-base unit sweep rate.

mm

I

Fig.

3-3.

U270

input combinaliotis for DISPLAY MODE selection

'Trigger Channel Switching

The Trigger Channel Switch U470
Signal Channel Switch. This stage determines which
(CH 1 or CH 2) provides the trigger stgnal for internal
triggering of the time-base
signal

is

controlled by inputs from the TRIGGER SOURCE
switch. Resistors
rent gain for each channel. Networks
C474-R474-C475-R475 and C574-R574-C575-R575 pro-

vide high-frequency compensation for each channel.

An

inputloutput table for this stage is shown in Fig. 3-4.

Wlien the level at pin 14 is LO, the output of U470 is

determined

the level at pin 4 LO, the channel 1 and channel 2

and
triggers are added algebraically.

Signal

Output stage,
of a pair of common-base connected transistors which pro-

and

'Phe Signal Output stage, Q280-Q380, and the Trigger

circuits.

R476-R477 and R576-R577 set the cur-

by

the level at pin 4. With the level at pin 14 HI

0480-0580, are similar. Each stage consists

unit. 7 he selection of the trigger

Output

is

identical to the

DISPLAY MODE AND

---

at

an approxi-

input

mainframe

I

Fig. 3-3 shows the U270 input combinations for each
position of the DISPLAY MODE switch. When the
pin 14 is LO the output of U270 is determined by
at pin

4.

With the level at pin 14 HI and the level

LO, the signals from both channel 1 and channel 2 are

passed to the Signal Output stage. This condition occurs

only when the DISPLAY MODE switch is set to ADD. In

is

this operating mode the signal output

of channel 1 and channel

determines the mainframe deflection.

2

signals and the resultant signal

the algebraic sum

level at

the level

at

pin 4

TRIGGER SWI"T'CHING

General

The Display Mode and Trigger Switching circuit deter-

mines

which input signal (Channel 1 or Channel
the Signal and Trigger outputs to the mainframe as selected
by the DISPLAY MODE and TRIGGER SOURCE switches.

This circuit also provides plug-in mode information to the

mainframe chop blanking circuit, and readout control infor­mation for proper

CRT display.

2)

providcs

Circuit Description--7A18/7A18N

7A18

DISPLAY MODE

'The DISPLAY MODE switch provides logic level outputs
to the Signal Channel Switch stage
Switches diagram 4). A table of the outputs for each
position of the DISPLAY MODE switch is shown in Fig.
3-3.

'TRIGGER SOURCE

The TRIGGER SOURCE switch provides logic level out-

puts to the Trigger Channel Switch

Switches diagram 4).

position is shown in Fig.

ALT

1

I

Fig.

'TRIGGER

-G6-D-E

3-4.

Input/Output combinations for

SOURCE

Switch

(U270, Channel

Switch

(U470, Channel

A

table of the outputs for each switch

3-4.

Trigger S~gnaI

--"---------

..f-"T--i5

switch selections.

*f-.

-cG"-t""Ei

;-me..----

ernates between

and

CH

2

+-*

-"------

CY"?

-...

cw_

GM

-"

?.

----

1

and

DISPLAY

Source

------

--*

-----"

CW

2

MODE

--

-- - -

GW

.--*-

----

-"

----

added

---

1

-

and

CONNECTORS AND READOUT

General

The Connectors and Readout circuit consists of the
power supply and signal distribution from the lnterface
Connector and the Readout Encoding circuit. A schematic

is

of this circuit
section.

shown on Diagram 6 in the Diagrams

Connectors

All the connections made to the mainframe by the 7A18
are shown on the Connectors portion of Diagram 6. Also
shown are the power

sopply decoupling components.

Readout Encoding (7A18 only)

'The Readout Encoding circuit consists of switching

resistors and probe sensing stage

2,

the Channel 1 and
readout of deflection factor, uncalibrated deflection factor
(VARIABLE) information, and signal inversion (channel 2
only). Data is encoded on these output lines by switching
resistors between them and the time-slot input lines, or by
adding current through 0620.

R647-CR647 are switched between time-slot three

(TS-3) and Column output line when the CAL

uncal position. This results in the symbol > (greater

in the
than) being displayed preceding the deflection factor read­out. R648 (Channel
the Column output line when the

is in the INVERT position.

(inverted) being displayed preceding the deflection factor

readout.

Switching resistors are used to indicate the setting of the

VOLTSiDIV switch to the mainframe readout system. The
VOLTSIDIV switch is a cam-type switch. The dots on the
contact-closure chart (see Diagram 6) indicate when the
associated contacts are closed.
select the number 1,
combination that
prefix and R639 selects the symbol V (volts) in the 5 mV
through
switch. R638 selects the symbol V in the
positions.
stage (0620) select the decimal point (number of zeroes)
again depending on the resistor combination switched in by
the

factor of the probe connected to the input connector by
sensing the amount of current flowing from the current
sink through the probe coding resistance. The output of
this circuit corrects the mainframe readout system to in­clude the probe attenuation factor.
input connector provides the input to the probe sensing
stage from the probe coding resistance (coded probes
only; see
used for the
voltage divider with R621 through
supply.
determines, along with emitter resistor
current. When the -15 volt time-slot pulse is applied to

Interface Connector B33, 0620 is interrogated and
collector current
through Interface Connector A37.

.5

V (500 mV) positions of the VOLTSiDIV

R630, R631, and the output of the probe sensing

VOLTSiDIV switch.

Probe sensing stage Q620 identifies the attenuation

0pera;ing Instructions). The third contact is also

IDENTIF-Y input. The coding resistor forms a

The resultant voltage sets the bias on Q620 and

Row and Column output lines for

2

only) is switched between TS-2 and

2,

is

switched in. R637 selects the m (milli-)

is

added to the column current output

Q620. This circuit encodes

IN switch is

CH

2 POLARITY switch

This results in the symbol

R633, R634, and R635

or 5 depending on the resistor

1,

2, and 5 V

'The third contact of the

CR621 to the

R622,

--I5

the collector

its

1

V

REV.

D,

JAN.

1975

Circuit Description--7A1817A18N

7A18

With a
connector, 0620 is turned off. The deflection factor read­out

10X probe connected, the bias on 0620 will allow 100

a
microamperes of collector current to flow.
the deflection factor readout by a factor of 10.

The IDENTIFY button (S13 or 523 on Diagram
two things when pressed

I.

channel of the
discussion on the Channel 1 or Channel 2

1X

probe (or no probe) connected to the input

is

determined by the VOLTS!DIV switch position. With

1-his increases

I)

:

It

causes the trace representing the appropriate

7A18 to move about 0.3 division (see the

Input Amplifier).

does

2.

Forward biases CR621 and Q620 to result in a
sufficient amount of collector current which, when added
to the column current output, replaces the deflection factor
readout with the word "IDENTIFY".

These two actions aid in identifying the

when multiple traces are displayed. When the IDENTIFY

is

button
position are restored.

For further information on the operation of

system, see the oscilloscope instruction manual.

released, the deflection factor readout and trace

7A18 trace

the readout

Change information, if any, affecting this section will be found at the rear of this manual.

7A18

l

ntroduction Lubrication

This section of the manual contains maintenance infor-

mation for use in preventive maintenance, corrective main- connecting plug contacts, and switch contacts. Lubricate

tenance, and troubleshooting of the

Further maintenance information relating to component

color codes and soldering techniques can be found in the

instruction manuals for the 7000-series oscilioscopes.

7A18. switch detents with a heavier grease. A lubrication kit

PREVEN'TIVE MAINTENANCE

Use a cleaning-type lubricant on shaft bushings, inter-

containing the necessary lubricating materials and instruc-

is

tions

Tektronix Part Number 003-0342-01.

available through any Tektronix Field Office. Order

Recalibration

To ensure accurate measurements, the 7A18 should be
checked after each
months if used infrequently. A complete performance
check procedure

1000 hours of operation or every six

is

given in Part I for Section

5.

General

Preventive maintenance, consisting of cleaning, visual
inspection, lubrication, etc., performed on a regular basis,
will improve the reliability of this instrument. Periodic
checks on the semiconductor devices used in the unit are
not recommended as a preventive maintenance measure.
See semiconductor-checking information given under
Troubleshooting.

The performance check procedure can be helpful in

isolating

troubles not apparent during regular operation may be

revealed

major

and

corrected.

troubles

in

the

unit.

Moreover,

minor

TROUBLESHOOTING

Cleaning

Avoid the use of chemical cleaning agents which

might damage the plastics in this instrument. Avoid

chemicals containing benzene, toluene, xylene, ace-

tone, or similar solvents.

Front Panel. Loose dust may be removed with a soft

cloth or a dry brush. Water and mild detergent may be

used; however, abrasive cleaners should not be used.

Interior. Cleaning the interior of the unit should pre-

cede calibration, since the cleaning process could alter the

settings of the calibration adjustments. Use low-velocity
compressed air to blow
dirt can be removed with a soft, dry brush, cotton-tipped

swab, or cloth dampened with a mild detergent and water

solution.

off the accumulated dust. Hardened

General

The following
contained in other sections of this manual when trouble­shooting the 7A 18. The schematic diagrams, Circuit
Description, and Calibration sections should be used to full
advantage.
information on circuit behavior and output requirements.

The Circuit Description section gives detailed

is

provided to augment information

Troubleshooting Aids

Diagrams. Circuit diagrams are given on foldout pages in
Section 7.
component in this instrument are shown on the diagrams.
important voltages are also shown.

Circuit Board. The circuit board used in the
outlined on the schematic diagrams, and a photograph of
the board
board-mounted electrical component
photograph by

The circuit number and electrical value of each

7A18

is

shown on the back of Diagram

is

identified on the

its

circuit number.

1.

Each

is

2.

7A18

Component and Wiring Color Code. Colored stripes or
dots on resistors and capacitors signify electrical values,
tolerances, etc., according to the EIA standard color code.
Components not color coded usually have the value printed
on the body.

The insulated wires used for interconnection in the

7A18 are color coded to facilitate tracing a wire from one

point to another in the unit.

4-1

Semiconductor Lead Configuration. Fig.

lead configuration of the semiconductor devices used in this
instrument.

shows the

DC Voltmeter and Ohmmeter -A voltmeter for
checking voltages within the circuit and an ohmmeter for
checking resistors and diodes are required.

3.

Test Oscilloscope-.A test oscilloscope is required to

view waveforms at different points in the circuit.

A Tektronix 7000-series Oscilloscope equipped with a
readout system,
Time-Base unit, and a 7A-series Amplifier unit with a
probe will meet the needs for items 2 and

7D13 Digital Multimeter unit, 76-series

10X

3.

Troubleshooting Procedure

This troubleshooting procedure is arranged in an order

Troubleshooting Equipment

The following equipment is useful for troubleshooting

the 7A 18.

1. Semiconductor Tester--Some means of testing the
transistors, diodes, and
helpful. A transistor-curve tracer such as the Tektronix tion of a control or front-panel connector, see the

Type 576 will give the most complete information.

FET's used in this instrument is

which checks the simple trouble possibilities before pro­ceeding with extensive troubleshooting.

1. Check Control Setting. An incorrect selting of the
7A18 controls can indicate a trouble that does not exist. If
there is any question about the correct function or opera-

Operating Instructions section.

Fig.

4-1.

Electrode configuration for semiconductors used in this instrument.

2.

7A18

Check Associated Equipment. Before proceeding
with troubleshooting of the
ment used with this instrument is operating correctly. If
possible, substitute an amplifier unit known to be operating

correctly into the indicator unit and

persists. Check that the inputs are properly connected and
that the interconnecting cables are not defective.

3.

Visual Check. Visually check the portion of the
instrument in which the trouble is suspected. Many troubles
can be located by visual indications, such as unsoldered
connections, broken wires, damaged circuit boards,

damaged components, etc.

4.

Check Instrument Performance. Check the cali­bration of the unit, or the affected circuit by performing

I

--

Part
trouble may only be a result of misadjusrment and may be
corrected by calibration. Complete calibration instructions
are given in Part

5.
component or stage can be located by checking for the
correct voltage or waveform in the circuit. Typical voltages
and waveforms are given on the diagrams; however, these
are not absolute and may vary slightly between instru­ments. To obtain operating conditions similar to those used
to take these readings, see the instructions in the Diagrams
section.

6. Check
methods are provided for checking the individual compo-

nents in the
are best checked by disconnecting one end to isolate the
measurement from the effects of surrounding circuitry.

A. 'TRANSISTORS AND INTEGRATED CIRCUITS.
The best check of transistor and integrated circuit
operation is actual performance under operating conditions.

If a transistor or integrated circuit is suspected of being

defective,

ponent known to be good; however, be sure that circuit
conditions are not
damaged. If substitute transistors are not available, use a
dynamic tester (such as Tektronix Type 576). Static-type
testers may be used, but since they do not check operation
under simulated operating conditions some defects may go
unnoticed. Fig.
of semiconductor devices. Be sure the power is off before
attempting to remove or replace any transistor or integrated
circuit.

Performance Check of Section

II

of Section

Check Voltages and Waveforms. Often the defective

l

ndiv idual Components. The following

7A18. Components which are soldered in place

it

can best be checked by substituting a com-

sl.ich that a replacement might also be

4-1

shows base pin and socket arrangements

7A18, check that the equip-

see if the problem

5.

The apparent

5.

Integrated circuits can be checked with a voltmeter, test
oscilloscope, or by direct substitution. A good under­standing of the circuit description is essential to trouble­shooting circuits using integrated circuits. Use care when
checking voltages and waveforms around the integrated
circuits so that adjacent leads are not shorted together. An
integrated-circuit test clip provides a convenient

14-

clipping a test probe to the
cuits. Phis device also doubles as an integrated-circuit
extraction tool.

A

B. DIODES.

a

short circuit by measuring the resistance between termi­nals with an ohmmeter set to the R
resistance should be very high in one direction and very low
when the meter leads are reversed. Do not check tunnel
diodes or back diodes with an ohmmeter.

Do not use an ohmmeter scale that has a high internal

current. High currents may damage the diodes.

C.

RESISTORS. Check resistors with an ohmmeter.
Resistor tolerance is given in the Electrical Parts List.
Resistors normally do not need to be replaced unless the
measured value varies widely from the specified value.

D. CAPACITORS. A leaky or shorted capacitor can be
detected by checking resistance with an ohmmeter on the
highest scale. Use an ohmmeter which will not exceed the
voltage rating of the capacitor. The resistance reading
should be high after initial charge of the capacitor. An open
capacitor can best be detected with a capacitance meter, or
by checking whether the capacitor passes AC signals.

7.

Repair and Readjust the Circuit. Special techniques
required to replace components in this unit are given under
Component Replacement. Be sure to check the perfor­mance of any circuit that has been repaired or that has had
any electrical components replaced. Recalibration of the

affected circuit may be necessary.

diode can be checked for an open or for

and 16-pin integrated cir-

X I k scale. The diode

rneans of

REPLACEMEN-T PARTS

Standard Parts

Ail electrical and mechanical part replacements for the

7A18

can be obtained through your local Tektronix Field

Office or representative. However, many of the standard
electronic components can be obtained locally in less time
than is required to order them from Tektronix, Inc. Before
purchasing or ordering replacement parts, check the parts

lists for value, tolerance, rating, and description.

REV.

D,

MAY,

1975

COMPONENT REPLACEMENT

7A18

When selecting replacement parts, it is important to
remember that the physical size and shape of the
component may affect its performance in the instru­ment. All replacement parts should be direct replace­ments unless it is known that a different component

will not adversely affect the instrument performance.

Special Parts

Some parts are manufactured or selected by Tektronix

to satisfy particular requirements, or are manufactured for
Tektronix to our specifications. These special parts are
indicated in the parts list by an asterisk preceding the part
number. Most of the mechanical parts used in this instru­ment have been manufactured by Tektronix. Order all
special parts directly from your local Tektronix Field
Office or representative.

Ordering Parts

When ordering replacement parts from Tektronix, Inc.,

refer to the Parts Ordering Information and Special Notes
and Symbols on the page immediately preceding the Elec­trical Parts List section. Include the following information:

1. lnstrument type

2.

Instrument Serial Number

3.

A description of the part (if electrical, include the

circuit number)

4.

Tektronix Part Number

(7A18)

General

The exploded-view drawing associated with the Mechan­ical Parts List may be helpful when disassembling or re­assembling individual components or sub-assemblies.

Circuit Board Removal

In general, the circuit boards used in the 7A18 need

never be removed unless they must be replaced. Electrical

connections to the boards are made by soldered con-

it

is

nections. If

assembly, use the following procedures.

A.

READOUT CIRCUIT BOARD REMOVAL (7A18 only)

1. Disconnect the wires connected to the outside of the

board.

2.

Remove the seven screws holding the board to the

mounting surface.

3.

Disconnect the wires connected to the inside of the

board.

4.

Remove the board from the unit.

5.

To replace the board, reverse the order of removal.

B. ATTENUATOR CIRCUIT BOARD REMOVAL

1. Remove the readout board as outlined in the previous

procedure.

necessary to replace a circuit board

Soldering Techniques

Attenuator Circuit Boards. The Attenuator circuit
boards are made from polyphenylene oxide because of
excellent electrical characteristics. Use more than normal
care when cleaning or soldering this material. The following
rules should be observed when removing or replacing parts:

1.

Use a very small soldering iron (not over 15 watts)

2.

Do not apply more heat, or apply heat for a longer

time, than is absolutely necessary.

3.

Use a vacuum-type desoldering tool to remove the

excess solder from the circuit board.

4.

Do not apply any solvent containing ketones, esters,

or halogenated hydrocarbons.

5. To clean, use only water-soluble detergents, ethyl,

methyl, or isopropyl alcohol.

its

2.

Disconnect the resistor/capacitor connected to the

rear of the board.

3.

Loosen the front set screw on the VARIABLEIGAIN

control shaft coupling (use a 0.050-inch hex-key wrench).

4.

Retnove the red VARIABLE control knob and rod

from the control shaft.

5. Remove the remaining front-panel knobs using a

111 6-inch hex-key wrench.

6. Remove the front panel from the instrument.

7.

Remove the attenuator shields.

8. Disconnect the wires and resistor from the input BNC

connector.

9.

Remove the input BNC connector.

10. Remove the POSITION control using a 5116-inch

7A18

nut driver.

11. Remove the attenuator board with cam switch from

the instrument.

12. To replace the board, reverse the order of removal.

C. AMPLIFIER CIRCUIT BOARD REMOVAL

1. Remove the Readout circuit boards as given pre-

viously.

2.

Remove the plastic plug-in guide from the rear of the

instrument.

3.

Disconnect the wires connected to the board from

the front-panel controls.

B. ROTARY SWITCHES

Single wafers on the DISPLAY MODE and TRIGGER
SOURCE switches are not normally replaced. If any part of
these switches
should be replaced. A new switch can be ordered through
your Tektronix Field Office.

When disconnecting or connecting leads to a wafer-

type rotary switch, do not let solder flow around and

beyond the rivet on the switch terminal. Excessive
solder can destroy the spring tension of the contact.

is

defective, the entire switch assembly

Transistor and Integrated Circuit Replacement

4.

Loosen the front hex-socket screw in the front

coupling of the VARIABLE control shaft using a

0.050-inch hex-key wrench. Pull the VARIABLE knob and
shaft from the front of the instrument.

5. Loosen the front hex-socket screw in the coupling

between the DISPLAY MODE and 'TRIGGER SOUCE

switch sections. Pull the T'RIGGER SOURCE knob and

long shaft from the front of the instrument.

6. Loosen the front hex-socket screw in the coupling of

the DISPLAY MODE switch shaft using a 5116-inch

key wrench. Pull the DISPLAY MODE knob and long shaft

from the front of the instrument.

7.

D i scon nect the resistor-capacitor combinations

connected to the ceramic strips at the front of the board.

8.

Remove the screws and nuts securing the board to

the chassis or other mounting surface.

9.

Remove the board from the instrument.

10. To replace, reverse the order of removal.

hex-

Switch Replacement

Several types of switches are used in the 7A18. The
following special maintenance information is provided for
the cam-type switches and rotary switches.

A. CAM-TYPE SWITCHES

CAUTION

m

Repair of cam-type switches should be undertaken

only by experienced maintenance personnel. Switch
alignment and spring tension of the contacts must be
carefully maintained for proper operation of the
switch. For assistance in maintenance of the cam-type
switches, contact your local Tektronix Field Office or

resen ta tive.

rep

Transistors and IC's should not be replaced unless
they are actually defective. If removed from their sockets
during routine maintenance, return them to their original
sockets. Special care must be given to integrated circuit
leads, because they can easily be damaged in removal
from sockets. Unnecessary replacement or switching of
components may affect the calibration of the instrument.
When a transistor
part of the instrument that may be affected.

is

replaced, check the operation of that

Recalibration After Repair

After any electrical component has been replaced, the
calibration of that particular circuit should be checked, as
well as the calibration of other closely related circuits.
Performance Check instructions given in Part I of Section
provide a quick and convenient means of checking the
instrument operation. The Calibration Procedure in Part
of Section 5 can then be used to adjust the operation to
meet the Performance Requirements listed in Section 1.

The

5

II

Repackaging for Shipment

If the 1-ektronix instrument is to be shipped to a 1-ektronix
Service Center for service or repair, attach a tag showing:
owner (with address) and the name of an individual
firm that can be contacted, complete instrument serial
number and a description of the service required.

Save and re-use the package in which your instrument was
shipped. If the original packaging
available, repackage the instrument as follows:

Surround the instrument with polyethylene sheeting to
protect the finish of the instrument. Obtain a
corrugated cardboard of the correct carton strength and
having inside dimensions of no
than the instrument dimensions. Cushion the instrument
by tightly packing three inches of dunnage or urethane
foam between carton and instrument, on all sides. Seal
carton with shipping tape or industrial stapler

The carton

test

strength for your instrument is 200 pounds.

is

unfit for use or not

less

than six inches more

at

your

caiton of

REV.

E

DEC

1976

4-5

Change information, if any, affecting this sec

7A18

,tion will be found at the rear of the manual.

Recalibration l nterval

To assure instrument accuracy, check the calibration of

7A18 every 1000 hours of operation, or every six

the

months if used infrequently. Before complete calibration,
thoroughly clean and inspect this instrument as outlined in
the Maintenance section.

Tektronix Field Service

Tektronix, Inc. provides complete instrument repair and

recalibration at local Field Service Centers and the Factory
Service Center. Contact your local Tektronix Field Office

or representative for further information.

Using 'This Procedure

General. This section provides several features to facili

tate checking or adjusting the 7A18. These are:

Index. To aid in locating a step in the Performance

Check or Adjustment procedure, an index is given pre-

----

ceding Part I

ment procedure.

Performance Check and Part II

--

Adjust-

instrument is both correctly adjusted and performing

within all Performance Requirements as given in Section

TEST'

EQUIPMEN'T REQUIRED

General

The following test equipment and accessories, or its
equivalent, is required for complete calibration of the
7A18. Specifications given for the test equipment are the
minimum necessary for accurate calibration. Therefore,
some of the specifications listed here may be somewhat less
precise than the actual performance capabilities of the test
equipment. All test equipment is assumed to be correctly
calibrated and operating within the listed specifications.

The Performance Check and Adjustment procedures are
based on this recommended equipment. If other equipment
is substituted, control settings or calibration
need to be altered to meet
ment used. Detailed operating instructions for the test
equipment are not given in this procedure. Refer to the
instruction manual for the test equipment if more infor­mation is needed.

tlie requirements of the equip-

setup may

1.

Performance Check. The performance of this instru­ment can be checked without removing the side shields or
making internal adjustments by performing only Part I
Performance Check. This procedure checks the instrument

against the tolerances listed in the Performance Requirement
column of Section 1. In addition, a cross-reference is pro-

II

---

vided to the step in Part
the instrument to correct calibration. In most cases, the
adjustment step can be performed without changing control
settings or equipment connections.

Adjustment Procedure. To return this instrument to

correct calibration with the minimum number of steps,
perform only Part
cedure gives the recommended calibration procedure for all
circuits in this instrument.

Complete Performance

pletely check and adjust all parts of this instrument, per-

form both Parts I and I I. Start the complete procedure by
performing the Adjustment procedure and follow this with
the Performance Check. 'i'his method will assure that the

II

Adjustment which will return

--

Adjustment. The Adjustment pro-

Check/Adjustment. To com-

Calibration Equipment Alternatives

All of the test equipment is required to completely
check and adjust this instrument. However, some of the
items used only for the Performance Check can be deleted
without compromising
capabilities. For example, the low-frequency
amplitude signal generator is used on1 y in the Performance
Check and may be deleted if the user does not desire to

check the lower frequency response or
operation. Equipment used only for the Performance
Check procedure is indicated by note
only for
note

tlie Adjustment procedure are indicated by

2.

the instrument's measurement

constant-

triggel- source

1

;

items required

Test Equipment

1.

7000-series oscilloscope, referred to
Oscilloscope in this procedure. Tektronix 7403 recom­mended.

2.

T'ime-Base plug-in unit, Tektronix 7B50.

as

the Indicator

3. Amplitude Calibrator. Output signal, one kilohertz

7A18

square wave; output amplitude, 20 millivolts to 20 volts;
amplitude accuracy, within 0.25%. Vektronix PG 506
Pulse Generator

4. Medium-frequency constant-amplitude sine-wave gen-

erator.' Frequency, variable from 50 to 75 megahertz;

reference frequency, 50 kilohertz; output amplitude, vari-

able from 50 millivolts to 200 millivolts into 50 ohms;

amplitude accuracy, output amplitude constant within
at 50 kilohertz and from 50 to 75 megahertz. For example,

Tektronix SG 503 Signal

5. Low-frequency constant-amplimde signal generator.'

Frequency range, two hertz to 10 kilohertz; output ampli­tude, variable from 10 millivolts to 400 millivolts peak to
peak. For example, General Radio 1310-B Oscillator (use
General Radio Type 274
put).

6. Square-wave

put capabilities (may be obtained from separate genera-

tors): 12 volts amplitude into 50 ohms at one kilohertz
with a

into 50 ohms at 100 kilohertz with a

second or less. Tektronix PG 506 Pulse Generator recom­mended (meets both output

0589-00.

risetime of 12 nanoseconds or less; 500 millivolts

7. Plug-in extender.' Tektronix Part Number 067-

re~ommended.~

3%

en era tor.^

ClBJ Adapter to provide BNC out-

Must have the following out-

risetime of one nano-

requirements).3

14. In-line BNC termination.' Impedance, 50 ohms;

wattage rating, two watts; accuracy,

BNC, Tektronix Part No. 01 1-0049-01.

15.

10X BNC attenuator.' Impedance, 50 ohms; accu­racy,
0 1 1-0059-02.

X 20 picofarads; attenuation, 2X; connectors, BNC.
tronix calibration fixture 067-0538-00,

connector. Tektronix Part No. 017-0064-00.

+2%; connectors, BNC. Tektronix Part No.

16. Input RC normalizer.' Time constant, one megohm

17.

~da~ter.' Adapts GR874 connector to BNC male

22%; connectors,

Tek-

Adjustment Tools

18. Screwdriver. Three-inch shaft, 3132-inch bit. For

example, Xcelite R-3323.

19. Low-capacitance s~rewdriver.~ 1 1 /2-inch shaft.

Tektronix Part No.

20. Tuning tool.2 Handle with inserts for input capaci-

tance and attenuator adjustments. 'T'ektronix Part No.

003-0307-00,003-0334-00,

003-000@00.

and 003-0497-00.

Accessories

8. l&inch cable.' Impedance, 50 ohms; type, RG-58/U;

connectors, BNC. Vektronix Part No. 012-0076-00.

9. 42-inch cable. Impedance, 50 ohms; type

connectors, BNC. Tektronix Part No. 012-0057-01.

10. Five-nanosecond cable. Impedance, 50 ohms; type,

R G-2

13/U; connectors, GR874. Tektronix Part No.

01 7-0502-00.

1

1. In-line G R termination. Impedance, 50 ohms; wat-

tage rating, two watts; accuracy,

input with BNC male output. Tektronix Part No.
01 7-0064-00.

12. Dual-input coupler.' Matched signal transfer to each

input. Tektronix calibration fixture

13. 10X GR atten~ator.~ Impedance, 50 ohms;
accuracy,
01 7-0078-00.

'

Required only for Psrforlnance
Required only for Adjustment procedure.
Requires TM 500-Series Power Module.

+2%; connectors, GR874. Tektronix Part No.

f

2%; connectors, GR874

067-0525-00.

Check.

RG-581U;

Preliminary Control Settings

Set the Indicator Oscilloscope and 7A18 controls as

follows (for both Performance Check and Adjustment

Rate

:

lndicator Oscilloscope

display

lllum As desired

mV

I

kHz

7A18

CH 1 and

CH

2

procedure)

l ntensity Mid range
Focus Adjust for well-defined

Graticule

Calibrator 40
Vert Mode Left

Trig Source Left Vert

DISPLAY MODE CH 1
TRIGGER SOURCE MODE
CH 2 POLARITY +UP

POSlrlON Midrange
VO LTSlD IV 10 mV
AC-GND-DC DC

REV.

E,

MAY,

1976

Performance Check-7A1817A18N

7A18

PART

I-PERFORMAMCE

Introduction

The following procedure checks the performance of the
7A18 without removing the covers or making internal
adjustments. All tolerances given in this procedure are
based on Section 1 of this manual.

Index to Part I

1. Check Channel 1 and 2 GAIN

2. Check Channel 1 and

Factor Accuracy

3.

Check Channel 7 and 2 VARIABLE Page 5-4

(VOLIS/DIV) Range

4. Check Channel 1 and

IDENTIFY

5. Check Channel 1 and 2 Upper Band-

width

6. Check Channel 1 and

quency Response

7.

Check Channel Isolation

--

Performance Check

(7A18 only)

Page 5-3

2

Deflection Page 5-3 Settings.

2

'Trace Page 5-4

Page 5-4

2

Lower Fre- Page 5-4

Page 5-5

CHECK

2.

Connect the Indicator Oscilloscope to a power source

which meets the frequency and voltage requirements of the

power

supply.

3.

Turn the indicator Oscilloscope power on. Allow at

least twenty minutes warmup for checking the 7A18 to the

given accuracy.

4. Set the controls as given under Preliminary Control

NOTE

The checks titled Channel I and 2 apply equally to

both channels. Perform the check on the channel

by

selected

1.

Check Channel I and

a. Connect the standard amplitude calibrator output to
the CH
cable and dual-input coupler.

b.

Set the standard amplitude calibrator for a 50-

millivolt square-wave

the DISPLA

1

and CH 2 input connectors with the 42-inch BNC

otltpu

Y

MODE

2

t.

switch.

GAIN

8. Check Common-Mode Rejection Ratio

9.

Check Alternate Operation

10. Check Chopped Operation

1

1. Check Trigger Source Operation

Page 5-5

Page

Page 5-6

Page 5-6

Preliminary Procedure for Performance Check

NOTE

The perforn~ance of this insrnrmenf can be checkecl

at

any

temperature within the 0°C to

unless stated otherwise.

1.

Instail the

rnent of the Indicator Oscilloscope.

7A?8

in the left vertical plug-in cornpart- deflection within

+50°c

range

5-5

CHECK--CRT display for a five-division display.

c.

d. If necessary, adjust the front-panel GAlN control for
exactly five divisions of vertical deflection. To adjust, press

in

the

GAlN

knob

with

a

screuldriver and turn until the

GAlN control is engaged.

e. Set the DISPLAY MODE switch to CH

parts c and d of this step for Channel

2.

Check Channel 1 and 2 Deflection Factor

2.

2

and repeat

Accuracy

a. Set the Channel 1 AC-GND-DC switch to GND.

b. CHECK-Using the VOLIS/DlV and standard ampli-

tude calibrator settings given in Table 5-1, check vertical

2%

in each position of the VOLTS/DIV

switch.

Performance Check--7A1817A18N

7A18

c, Change the following conttal settings.

DISPLAY MODE CH
CH 1 AC-GRID-DC DC
CH 2 AC-GND-DC GND

ti

Repeat part b of this step for Channel

4.

Check Channel 1 and 2 Trace IDENTIFY

(7A18

1

POSITION control.

I

the trace moves

only)

a.

Center the CRT display vertically

b.

CHECK Press the IDENTIFY button and cIleck that

~~pward.

with

the 7Al8

Vertical Oeflecttcln Accuracy

3,

Check Channel 1 and

DIV) Range

Ser

rhe Channel 1 and 2 VOLTSIDIV switches to 10

a

IIIV

and

the

standard

01 1 t13tl

t.

TABLE

an-rijiitridc calibrator for d 50-millivolt

5-1

2

VARIABLE

(VOLTS/

c Set the DISPLAY

a

and b of thrs step

parts

d. D~sconnect ail test equipment.

5,

Check Channel 1 and 2 Upper Bandwidth

a.

Connect the medium-trerjuency constant-amplittrde

sine-wave generator ta the 7A

the five-nanosecond GR cable and in-line 50-ohm GR
terrnination.

b.

Set the mediiim-frecguet~cy generator for an eiglrt-

drvision display (80 millivolts)

frequency

amulitude decreases

least
herl~ in a 7500-series, or 75 niegahert7 In a 7700-series.

corlnector and connect

.

c, Increase the generator trectuency untif the display

d

CHECK Generator output frerjuet-rcy; nrilsl

50

rnegahertr in a 7400-series mainlrat~~e, 60 mega-

e. Disconnect the

MODE

for

to

5.6 clivisions.

generator output

it

switch to

Cllannel

18

to the CH 2 in~ut connector.

1.

CH

1

input connector

at

the 50-kilohertz reference

from

CM

1

and repeat

the CH 1 input

with

be

at

b.

Press

and

rctedscl

wat

d

lori it ion.

c

CMECI<--Witl, tile VARIABLE control fully counter-

clockwise.

d

tion.

DISPLAY MODE CH

CM 1 AG-GND-DC
CW 2 AC-GRID-DC

f.

check

Return the VARIABLE corrtrol to the CAL IN posi-

Repeat parts

the VARIABLE control to its out-

fur

two divis~ons or less of deflection.

2

GND

DC

h,

c, and d of this step for C1.lannel

2.

f.

Set the DISPLAY L'lODE switch to

g.

Repeat parts

h.

CALiBRArlON -See step 5 of

ced u re.

i,

Disconnect all test equiptnent.

6.

Check Channel 1 and

b,

c, and

d

of

Response

a.

Cf~ange the following control settinqs:

CX

1

and

VOL TSiDIV

AC-GRID-DC

CH

2.

this step for Channel

the

Adjusrrnent

2

Lower

CH 2

Frequency

3.

pro-

Performance

7A18

b. Set the time-base unit for a free-run~~ing sweep at a f. Disconnect the termination from Channel 1 and

rate of two

n~illiseconds!division.

connect it to the CH 2 input connector.

Check-"7A18/7A18N

c. Connect the low-frequency constant-amplitude
wave generator to the CH 2 input connector with the
42-inch BNC cable,
termination.

d. Set the low-frequency generator for a six-division
display (30 millivolts) at 10 kilohertz.

e. Decrease
amplitude decreases to 4.2 divisions.

CHECI<-Generator frequency; must be 10 hertr or

f.

less.

g.

Disconncct the low-frequency generator from the CH

inpul connector and connect it to the CH 1 input con-

2

nector.

11.

Set the DISPLAY MODE switch to CH 1

i. Repeat parts d througli f of this step for Channel

10X BNC allenuator, and 50-otim BNC

tile generator freq~~ency until the display

sine-

1.

2

g. Set the CH

h. Set the generator for a two-division

volts) at 50 megahertz.

i.

Cliange the following control settings:

CH 1 VOL
DISPLAY MODE CH
CH 2 VOLTSIDIV 10 mV

j.

CHECI< -CRT disl~lay for 0.4 division or less de-

flection.

k. Disconnect all test

8.

Check Common-Mode Rejection Ratio

a. Change the following control settings,

1

and CH 2 VOLPS/DIV 20

CH

VOLTSIDIV switch to

I'SIDIV 10 rnV

eiluipment.

.I

V

cfisplay (200 niilli-

1

rnV

j.

Disconnect all test ecluipment.

"7.

Check Channel Isolation

a. Change the follotiving control settings:

CH 1 and CH 2 DC

AC-GND-DC

ct-i

1

voL-r'SIDlV

CH 2 VOLTSIDIV 10 mV

b. Connect the mediitm-frequmcy generator to the CH 1

input connector with the five-nanosecond GR cable and

GR

in-line 50-ohm

c. Set the generator for a two-division display (200 milli-

volts) at 50 megahertz.

d. Change the following control settings:

DISPLAY MODE CH 2

1

VOLTSIDIV

CH

termination.

.I

10

v

mV

b.

Connect the mediurri-frequency generator to the CH

and CH 2 inpiit connectors with the five-nanosecond GR

GR

cable, in-line 50-ohm
coupler.

c. Set the

division display (160 millivolts) at 50 megahertz.

d. Change the following control settings:

DISPLAY MODE ADD
CH 2

CHECK--CRT display for 0.8 division or less de-

e.

flection (common-mode rejection ratio 10: 1 or better).

f. Disconnect all test equipment.

9.

Check Alternate Operation

a. Set the DISPLAY MODE switch to ALT

constant-arnplitucle generator for an eiqht-

POLARl'fY INVERT

termination, and the dual-input

1

e. Check--.CRT display for 0.4 division or less deflection

1

(channel isolation display ratio 50:

or better).

REV.

APR

b. Position

1974

tile traces abo~tt two divisions aitart,

Performance Check-7A1817A18N

7A18

c. Turn the time-base unit timeldivision switch through-

out

its

range.

1

d. CHECK-Trace alternation between channel
at all sweep rates. At faster sweep rates, alternation will not
be apparent; instead display appears as two traces on the
screen.

10.

Check Chopped Operation

a. Set the DISPLAY MODE switch to CHOP.

b. CHECK-CRT display for two traces.

11.

Check Trigger Source Operation

a. Change the following control settings:

DISPLAY MODE A
TRIGGER SOURCE CH

b. Connect the Indicator Oscilloscope Cal Out connector

to the CH

c. Set the time-base unit for a triggered display at a

sweep rate of

1

input connector with the 18-inch BNC cable.

0.5

millisecond/division.

LT

I

and

d. Connect the low-frequency generator to the CH

input connector with the 42-inch BNC cable.

2

e. Set the generator for a two-division

one-kilohertr signal.

f. CHECK-CRT display for square wave and sine wave;

square wave only is stable.

g.

Set the TRIGGER SOURCE switch to MODE.

h. CHECK-CRT display; square wave and sine wave are

both stable.

i.

Set the TRIGGER SOURCE switch to CH

j.

CHECK-CRT display; sine wave only

k.

Disconnect all test equipment.

This completes the Performance Check procedure for

7A18.

the
this procedure,
specified limits.

If the instrument has met all tolerances given in

it

is

correctly calibrated and within the

(40

is

stable.

2

millivolts)

2.

Adjustment-. 7A1817A18N

7A18

PART

1

ntroduction

The following procedure returns the
calibration. All
are calibration guides, and should not be interpreted as
instrument specifications except as listed in the
mance Requirement column of Section
operation of the instrument may exceed the given limits or
tolerances if the instrument meets the Performance

Requirements as checked in Part

this section.

limits and tolerances given in this procedure

I

--

Performance Check of

II-ADJUSTMENT

7A18 to correct

Perfor-

1.

The actual

index to Part I1 - Adjustment

1.

Adjust Channel 1 and 2 DC Balance Page 5-7

2.

Adjust Channel 1 and 2 GAIN

3.

Adjust Channel 1 and 2 Input Capa- Page

citance

4.

Adjust Channel 1 and 2 Attenuator Page

Compensation

5.

Adjust Channel 1 and

Frequency Compensation

2

High- Page5-10

Page 5-8

5-8

5-9

Preliminary Procedure For Adjustment

NO

TE

This instrument st~ould be adjusted at an ambient

temperature of

1.

Remove the left side shield from the 7A18, and the

left side panel from the Indicator Oscilloscope.

25'~

k5"~

for best overall accuracy.

5. Set the controls as given under Preliminary Control

Settings.

6.

Adjust the Focus and Astigmatism as necessary to

obtain a well-defined

Titles for external controls of this instrumetr t are

capitafized in this procedure (e.g., VOL

Internal adjilstments are initial capitalized only (e.g.,

DC Balance).

display.

N07-E

TSIDI

Location of Adjustments

The locations of the 7A18 adjustments are shown in Fig.

5-1.

1.

Adjust Channel 1 and 2 DC Balance

a. Position the trace to the center horizontal line with

the CH

control to its outward position,

counterclockwise to fully clockwise. Trace should
more than 0.5 division vertically.

1,

is

position.

1

POSITION control.

b. Push and release the CH

c. CHECK--Turn the VARIABLE control from fully

d. ADJUST-Channel
for minimum trace shift as the CH 1 VARIABLE control

rotated from fuily counterclockwise to fully clockwise.

e. Set the CH 1 VARIABLE control to the CAL IN

f. Set the DISPLAY

1

VARIABLE (VOLTSIDIV)

1

DC Balance, adjust~nent nuinber

MODE

switch to CH

2.

not move

V).

2.

Install the 7A18 in the left vertical plug-in compart-

ment of the tndicator Oscilloscope.

3.

Connect the Indicator Oscilloscope to a power source

which meets the frequency and
oscilloscope power supply.

4.

Turn the indicator Oscilloscope power on. Allow at

least twenty minutes

warmup before proceeding.

voltage requirements of the

REV.

g.

Position the trace to the center horizontal line with

CH

2

the

outward position. (For instrumet~ts B070000 and below.)
Perform the following for instruments 8070000 and up:

APR

1974

POSI"TI0N control.

h.

Push and release the CH 2 VARIABLE control to its

5,

Fig.

ADJUST---DC BAL (see number
trace shift while switching

-1

from

UP to l NVf

HT.

CH

2

5-1)

POLARIT'Y switch

for no

5-7

r""#jFf0rn7

7A18

;?A

SN

a,

coun'&ercImkivisa

more

1.

5,

for

IF

notared

k

number

VARl

io

fully

1,

past

tion,

2,

Adjust

a,

2

input

b,

gq~~3re-h~

c,

the

CH

d.

amp

r;.

exc!CbEy

parts

$8

d~eiolrl,

BU700m

CHECK

than

ADJLIST

-Turn

0.5

Yliv~~i017

ajxr~lirnrrm

from

ADJUST--CH

9,

Fag,

ABLE

cssntsad

clockwose.

Set

rke

CH

Chal~nel

Conrjsct

Set

Pos"utiorx

CbjEGK-

libido.

ADJIJST-CH

tlhe

connetor

the

stantlard

BMB

output,

tJhe

2

PQSX1-ION

Five

dnuisions

SN

Chonr-rel

5

CRT

NOTE

ip

j,

m7d

l

for

/'A

BOYmW

,;rtrf-l

up

and

A4

the

VARIABLE

to

frrlly

clrx:kawii;e,

V~I

t~carly.

2

DC

1ram

shift

as

frxlly

crarrnk~rt:tockwi~e

1

VARIABLE

11

for

nlxnimuarr

is

rotated

2

VARIABLE

I

and 2 GAIN

standard

with

clrspiiay

smpllbrde

the 42

mnplitxudn

to

the

crmvol.

display

2

GAIN

o"Fdcfleclism,

ISM

babow

Perforrts

k3aile!-ice,

the

18

SN

CH

p~3ri

BO$Omt?

Trace

2

VARIABLE

DC

1.1

ace

trum

faxliy

control

calibratcrr

rnch

RNC

calibrator

center

of

for

e*aactly

adjuatinerrt

To

aPN

"ca'8070We

k

for

7A

1BN

wjd

up.

ronta.01

adjustinens

si.xould

From

mot

nurrr

control

to

fully

clockwrsa,

BAL

(RWa'a,

sllrfr:

as

the

cuuntarclackwese

to

the

GAL

to

the

cable,

foa

50-xnilirvoll

the

proticilrl~ wit11

Five

dktsirrrrs

jfsrrnt

panell

adjust,

press

fkjliy

move

bw

sea

Clni

GI-1

for

in

the

2

IN

irr

GAIN

irnob

ctrnu

ol

i5

enqegd

f.

Di%ornnecrt:

CW

2

ia.xpul

60M14aPCt<>i.

g

Scr

the

h

Positton

CH

4

POSImaM

i,

Ck"OCK

nmplaladde,

j,

ADJIJSP

exactly

3,

BEaia::e

fivr?

k.

Disk3nir;iecE.

Adi~ast

a.

Raxrruvr~

the

7A

irintu

b

SBV

fire

mV.

c,

Cenrrc$ct

oulpux

to

wid1

qcaewdrrver

ti749

S~JXIF~OY.~

connectoo

DISPLAY

the

display

i:untrol,

-CR$

-

CEJ

1 GAIN

dk~sions

all

of

test

Channel

thr

7A"l

18

on

the

left

CH

7

anti

dae

sq~are-wave generator

the

Gi-1

dr~d

car%rrrcc

hpiODE

to

lF~r

display

tleflmriion,

ecaurpmenl.

"Bnd

2

ftoi'l~

illw

plug-in

l:wzrlical

Ck4

4

inpkrt

atid

iirrn

a~~lplltude

sw~tclr

cruoter

fur

xt

fo

ko

of

exackiy

c.riil~brd"~r

CE-O

dre

trrijarstmcnt

input

Capacitance

d~e

Endicoror

axtendor and plug

campdrmleoI.

7

V0LTS:OlV

conraectnr

until

tho

frnm

dja

CPO

1,

yrariculo

five

drvisiuns

{front

pas-iel)

OxilEuscope,

~vv\ilrltc:f~e'j;

htgh

ampdltt~de

mith

the

GAIN

1

finput

with

$0

five

the

in

for

the

5

Adjustment .-7A1817A18N

7A18

nanosecond GR cable, 10X GR attenuator, in-line 50-ohm
GR termination, and 20

d. Set the square-wave generator for a six-division
play (30 millivolts) of a

e. Set the time-base unit for a triggered display at a divisions of deflection.

.2

sweep rate of

f. CHECK-CRT display for square-wave with square signal to the CH
corner.

g. ADJUST- -Channel 1 C100 for optimum square corner
on the displayed waveform (use tuning tool).

h. Disconnect the
nector and connect it to the CH 2 input connector.

i. Set the DISPLAY MODE switch to CH 2.

j. CHECK--CRT display for square-wave with square

corner.

mill isecond/division.

pF normalizer.

dis- e. ADJUST-CH 2 attenuator compensations as given in

one-kilohert~ signal. Table 5-2 for optimum square corner and flat top on the

normalizer from the CH 1 input con-

top within 0.15 division. Re-adjust the generator output at

each switch position to provide six divisions of deflection.

displayed waveform (use tuning tool). Re-adjust the gen­erator output at each switch position to provide six

f. Disconnect the normalizer from CH 2 and connect the

g. Set the DISPLAY MODE switch to CH

CHECK- CRT display at each CH 1 VOLTSIDIV

h.
switch position listed in Table
top within 0.15 division. Re-adjust the generator output at
each switch position to provide six divisions of deflection.

i. ADJUST----CH
Table 5-2 for optimum square corner and flat top
displayed waveform. Re-adjust the generator output at each
switch position to provide six divisions of deflection.

1

input connector.

1.

5-2 for square corner and flat

1

attenuator compensations as given in

o,n the

j.

k. ADJUST----Channel 2

on the displayed waveform.

I. Disconnect all test equipment.

m. Remove the 7A18 and plug-in extender from the

Indicator Oscilloscope. Install the 7A18 only in the left

vertical compartment.

4.

Adjust Attenuator Compensation

a. Connect the square-wave generator high-amplitude
output to the CH 2 input connector with the five­nanosecond GR cable,
GR termination, and 20

b. Set the CH

c. Set the square-wave qenerator for a six-division

(60 millivolts) of one-kilohertz signal. Replace in-line 50-ohm GR termination

d. CHECK-CRT display at each CH 2
switch position listed in Table

1

Cl00 for optimum square corner

10X GR attenuator, in-line 50-ohm

pF normalizer.

and CH 2 VOLTSIDIV switches to 10

displav

VOLTSIDIV

5-2 for square corner and flat

Disconnect all test equipment.

TABLE

Attenuator Compensation

Switch Adjust for Optimum

Setting Square Corner

0.1

v

0.5 V

-

--,~

-~.-p.._~~ttt+

2 V Check Check
5 V Check Check

I

Remove

with GR to BNC male adapter.

10X G R attenuator.

5-2

Check

Check

I

Flat

I

~

--.-

Top

Check

"--

5.

7A18

Adjust Channel

1

and

2

High-Frequency

Con~pensation

a. Set the CH 1 and CH 2 VOLTSI'DIV switches to

10

mV.

h.

Connect the sqiiare-wave generator fast-rise output to

1

the CH

cat~le, 10X GR attenuator, and in-line 50-ohm GR termina-

tion.

c. Set the sc~uare-wave generator for a six-division display

(60

rl.

sweep rate of 2

111 tile follow~r,g steps, change the time-base unit

177agi7ifier from

at

Input connector with the five-nanosecond GR

nlillivoits) of a I00 k~lohertz signal.

Set tile time-base unit for a triggered display at a

microseconds,'division.

NOTE

XI

io

X

10

and cornpare the response

h1/1

sweep rates.

f.

ADJUST-Adjustments numbers
ontiinum square-wave response with mininiurn aberrations.
Use the low-capacitance screwdriver to adjust the variable
capacitors. Repeat
response is obtained.

g. Disconnect the termination from the

connector and connect it to the

h. Set the DISPLAY MODE

CHECK-CRT display for optinluni square-wave

i.
response with aberrations not to exceed 0.24
topeak.

j.

ADJUST Adjustments numbers 6,
optimum square-wave response with minimum aberrations.
Use the low-capacitance screwdriver to adjust the

capacitors. Repeat these adjustments until optirnurii

response

is

obtained.

these adjustments until o[,tirnurn

CH 2 innut connector.

switch to CH 2.

2,

3,

and 4 for

Cti 1 input

ciivision peak-

7,

and 8 for

variablo

e. CHECI<.-CUT display for optimum square-wave
response with aberrations not to exceed 0.24 division peak­to-peak.

This completes the Calibration of the
all test equipment. Replace the left side shield on the
and the left side panel on the Indicator Oscilloscope.

7A18. Disconnect

7A18

REV.

APR

1974

REPLACEABLE

7A18

Section 6--7A18f7A18N

ELECTRICAL

PARTS

PARTS ORDERING INFORMATION

Replacement parts are available from orthrough your IocalTektronix, Inc. Field Office

or representative.

Changes to Tektronix instruments are sometimes made to accommodate improved
components as they become available, and to give you the benefit of the latest circuit
improvements developed in our engineering department. It is therefore important, when
ordering parts, to include the following information in your order: Part number, instrument
type or number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or improved part, your local
Tektronix, Inc. Field
number

Change information,

Officeor representativewill contact you concerning any change in part

if

any, is located at the rear of this manual.

SPECIAL

XOOO Part first added at this serial number

OOX Part removed after this serial number

NOTES AND

SYMBOLS

ITEM

NAME

In the Parts List, an ltem Name is separated from the description by a colon

Because of space limitations, an ltem Name may sometimes appear as incomplete. For

ltem Name identification, the U.S. Federal Cataloging Handbook H6-1 can be

further
utilized where possible.

(:).

ABBREVIATIONS

ACTR
ASSY
CAP
CER
CKT
COMP
CONN
ELCTLT
ELEC
INCAND
LED
NONWIR

ACTUATOR
ASSEMBLY

CAPACITOR
CERAMIC

CIRCUIT

COMPOSITION
CONNECTOR
ELECTROLYTIC
ELECTRICAL
INCANDESCENT

EMITTING DIODE

LIGHT

WIREWOUND

NON

PLSTC

Q-TZ

RECP
RES
RF
SEL
SEMICOND
SENS
VAR
WW
XFMR
XTAL

PLASTIC
QUARTZ

1

RECEP
RESISTOR
RADIO FREQUENCY
SELECTED
SEMICONDUCTOR
SENSl T IVE
VARIABLE
WIREWOUND

CRYSTAL

ACLE

l

RANSFORMER

Electrical

7A18

Parts List-7A1817A18N

CROSS

INDEX MFR.

CODE

MANUFACTURER

?%.IEN-BRADLEY CO
GENERAL EIXCTRIC CO., SEMI-CONDUCTOR
PRODUCTS DEPT.
AVX C'ERAMIC CORP.
FAIRCHILD SEMICONDUCTOR, A DIV. OF
FAIRCAILD CAMERA
TELEDYNE SEMICONDUCTOR
CLAROSTAT
SILICONIX, INC.
SPECIALTY CONNECTOR CO., INC.
MICROWAVE INSTRUMENTS
SPRAGUE ELECTRIC CO.
CENTPALAB ELECTRONICS, DIV.
GLOBE -UNION, INC
ERTE TECHNOLOGICAL PRODUCTS, INC.
JOHNSON,
TRW
RESISTORS, PHILADELPHIA DIVISION
OAK INDUSTRIES, INC., SWITCH DIV.
SrI'ACKPOLE CARBON CO
C-W INDUSTRIES
'EKTRONIX , INC
BECKMAN INSTRUMENTS, INC

E.

EJ,ECTRONIC COMPONENTS, IRC FIXED

MFG.

E'.,

.

AM]

INSTRUMENT CORP.

CO., INC.

.

CO.

.

.

&

COMPONENTS, INC.

OF

.

NUMBER

ADDRESS

----.mM----.-*P---~.=--.--.

1201

2ND ST. SOU'IH

EIECTRONTCS
P.O. BOX

464

ELLIS

12515

CHADRON Am.

LOWER WASHINGTON ST.

2201

LAURELWOOD

3560

MADISON AVE.

6600

BOMBARDIER ST.

5757

N. GREEN BAY AVE.

644

W.

299 lOTH

401

S. MAIN ST.

550

P.

2500

l2TR

N. BROAD ST.

DAVISVILLE

0.

BOX

HARBOR

867

ST.

AVE.

500

T0

PARK

RD.

ST.

S. W.

RD.

BlVD.

MANUFACTURER

SYRACUSE, NY

MURTLE BEACH, SC

MOUNTAIN VIEW, CA
HAWTHORNE, CA
DOVER,

SANTA CLARA, CA

INDIANAPOLIS, IN
MONTREAL
NORTH ADAMS

MILWAUKEE, WI
ERIE, PA
WASECA, MN

PHIXADF:LPHIA, PA
CRYSTAL

ST. MARYS, PA
WARMINSTER, PA
BEAVERT'ON, OR
FULLERTON, CA

NH

03820

458

16512

LAKE,

,

56093

13201

29577

90250

95054

46227

QUE

CAN

MA

01 247

53201

19108

IL

60014

15857

18974
97077
92634

94042

Electrical Parts

7A18

List--.-7A1817A18N

Tektronix

No.

--

1

1

2

1

2

2

1

Part No.

.".."

-

Ckt

--

c91

c10
~13~
~191
C20

~231
C106 1

C106

C106 2
C106 2

C107
C107 1
C107
C107
CllO

Clll
~114 1
C114 1
C114 2
C114 2

C115 1

C115

C115

c115

Cll8

SeriallModel No.

Eff

-.-,.

".,

CHASSIS

BOlOlOO 8039999
B040000
B020100 B029999
B030000

BOlOlOO
B040000
B020100
B030000

BOlOlOO
B040000
B020100
B030000
BO1OlOO

Dscont

Name

ATTENUATOR,FXD:ZX
Am?ENWATOR,FXD:2X
ATTEI?SUATOR,FXD:2X
ATW:WATOR, FXD : 2X
AmENVAfCOR,FXD:4X

ATTENVATOR, FXD : 1 OX
ATTENUATOR,FXD:lOX
ATTEWATOR,FXD:lOX
A~NWA~R,FXD:IOX
ATTENUAMR,FXD:lOOX

&

Descrir~tion

Mfr

Code Mfr Part

Number

c3

18
C118
C118
C119
C119

C119
C119
C238

C238

C438

6438

'7~18 only.
27~18~ only.
3~um~ished

as a

B040000
B020100
B030000
BOlOlOO
B040000

B020100
B030000
BOlOlOO
B020100
BOlOlOO

BOlOlOO B079999X
B020100 B059999X
BOlOlOO B079999X
B020100 B059999X

.

with S13, 7A18 only.

unit

AT'f'ENUATOR,FXD:lOOX
ATTEWTOR,FXD : lOOX
A'EEWRTOR,
ATrnNUA(4aTOR,E'XB:lOOX

A'I"~EWATOR.

AT~~ATOR,PXI3:100X
A'LTEKUATOR , FXD : lOOX

CAP.,FX5,CER

CAP.,F'XD,CER DI:lOPF,+/-lPF.500V
CAP.,IE'XD,CER DI:lOPF,+/-1PF.500V

SHIEWXNG BEAD,:0.6UH
SHf

EXDING

SHIETSTNG BEAD, : 0.6UH

SHIETSING BE%, : O.6UH

FXD

:

lOOX

PXD

:

LOOX

DI:lOPF,+/-lPF,500V

BEAD, : O.6UH

Electrical

7A18

Parts

List-

7~1817~18~

Ckt

No.

Tektronix

Part No.

Serial/Model

Eff

BOlOlOO B029999
B030000

BOlOlOO 8079999

B080000
B020100 8059999
B060000

XB080000

XE1060000

BOlOlOO 8079999
B080000

B020100 B059999

No.

Dscont

&

----,,"

--

RES.,VAR,NONWIR:5K OHM,20%,0.50W
RES.,VAR1NONWIR:5K OHM,lO%,lW
F(E$.,VAR,NONWIR:5K OHM,20%,0.50W
RES.,FXD,CMPSN:91 OHM,5%,0.125W
RES.,FXD,CMPSN:~~O OHM,5%,0.25W

Name

w*.---..---.-----......-.---.--.--..

Description

Mfr

Code

"

-

Mfr

Part

Number

SWITCH,ROTARY:DISPLAY MODE/TREG SCE(WEW.ED)
SWITCH,ROTARY:DISPLAY MODE/TRIG SCE

BOlOlOO
B080000

B020100

B060000

BOlOlOO

B080000

B020100
B060000

BOlOlOO
B040000
B020100
B030000
BOlOlOO

B040000
B020100
B030000

~1~ 672-0020-00 BOlOlOO B059999 CKT BOARD ASSY:READOUT CAM SW ATTENUA'IQR (2) 80009 672-0020-00
~13 672-0020-01 B060000 B099999 CKT' BOARD ASSY:RFADOUT CAM SW ATTENUAMR (2) 80009 672-0020-01

AL~

AlA3 670-1706-01 XBlOOOOO B119999 CFT BOARD ASSY:ATTENUATOR 80009 670-1706-01
Al~3 670-1706-02 B120000 CKT BOARD ASSY:ATTENUATOR 80009 670-1706-02
~12 670-1386-00 BOZO100 B049999 CKT BOARD ASSY:ATTENUATOR (2) 80009 670-1386-00

l~urnished as a unit with S23, 7A18 only.
'7~18~ only.
37~18 only.

4~nished as a unit with 5237.

5~nished as a unit with $3437.
6~urnished as a unit with R11,7Al8 only.
7~urnished as a unit with R21,7A18 only.
'Furnished as a unit with R237A,B.

672-0020-02 BlOOOOO CKT BOARD ASSY:mOUT CAM SW ATTEWUATOR (2) 80009 672-0020-02

SWITCH, ROTARY: CAL IN CH1 (WIRED)
SWITeH,ROTARY:CAL IN CHl(W1WD)
SWITCH,ROTARY:CAL IN CHl(W1RED)
SWITCH,ROTARY:CAL IN CHl(WIMD1
SWIWH,ROTARY:CAL

SWITCH ,ROTARY :CAL IN CH2 fWfHf.:D)
smwl-~, ROTARY
SWTTH, ROTARY : CAL IN CH2 (WIRED)

g~urnished as a unit with R437A,B.

IN

:CAL

IN CH2 f WIRED)

CHZ(WIRED)

REV. H JAN. 1976

Electrical Parts List---7A1817A18N

7A18

Tektronix SeriallModel No. Mfr

Ckt No. Part No.

_,"

-_-___.

__

All 670-1386-03 B050000 B085868 CKT BOARD ASSY:ATTEWATOR (2) 80009 670-1386-03
All 672-0480-00 B085869 CK'I' BOARD ASSY : CAM SW ATTENUA'I1OR (2

ClOO 281-0064-00
~101~ 281-0661-00 BOlOlOO B029999X CAP. ,FXD,CER DI:0.8PFt+/-0. lPP,500V 72982 301-000COK0808B

S100A312 105-0242-00 BOlOlOO B059999 ACTUATOR CAM SW:AC/GND/DC
S100A3r2 105-0242-01 B060000 8099999 Aa'UATOR
~100~ 1 105-0242-02 BlOOOOO
~100~3rl 105-0242-00 B020100 B049999 ACTUATOR,CAM SW:AC/GND/DC
~100~3rl 105-0242-01 B050000 B085868 ACTUATOR,CAM SW:AC/GND/DC

$100~ ~1 105-0242-02 B085869 ACTUATOR,CAM SW:AC/GND/DC
~100~~~~~ 105-0241-00 BOlOlOO B059999 ACTUATOR CAM SW:VOLTS/DIV
s100cl

S~OOB~~

1

s100cj

S~OOB)~

s1ooc{
sl00~t~r1 105-0241-01 B050000 ACTUATOR,
s100ci

105-0241-01 B060000 ACTUATOR

f1

105-0241-00 B020100 B049999 ACTUATOR,CAM SW:VOLTS/DIV

Eff

BOlOlOO
B070000
B080000
B120000
B020100
B060000
B085750

XB100000

B120000

Dscont Name & Description

CAP.,VAR,PLSTC:0.25-1.5PF,600V

RES.,FXD,CMPSN:fM OHM,5%,0.125W
RES. ,FXD,FILM:lM OHM, 1%,0.25W

ACTUATOR

B069999 CKT BOARD ASSY:AMPLIFIF:R
B079999 CK'l' BOARD ASSY:AMPLIFIEK
B119999 CKT BOARD ASSY:AMPLIFIEK

CKT BOARI) ASSY:AMPLIFIER
B059999 CKT BOARD ASSY:AMPLIFTER
B085749 CKT BOARD ASSY:AMPLIFIER

CK'l' BOARD ASSY :AMPLIFILR

CKT BOARD ASSY :AMPLIFIER
8119999 CKT BOARD ASSY:AMPLIYIER

CKT BOARD ASSY:AMPLIPIER

--..'l-l_l-

CAM

SW:AC/GND/DC

CAM

SW:AC/GM)/DC

CAM

SW :VOLTS/DTV

CAM

SW: VOLTS/DIV

----"

"--."

)

Code Mfr Part Number

80009 672-0480-00

72982 530-002

C210 283-0001-00 CAP. ,FXD,CER DI:O. 005UFr+100-0%,500V
C212 281-0557-00 CAP. ,FXD,CEK DI :1.8PF,10%, 500V
C216 290-0512-00
C225 2 281-0638-00 BOlOlOO B079999 CAP. ,FXD,CER DI:240PF, 5%,500V
C225 283-0067-00 B080000 CAP. ,FXD,CER DI:0.001UF,10%,200V
C225 1 281-0638-00 B020100 B059999 CAP. ,FXD,CER DI:240PF, 5%, 500V
C225 283-0067-00

17~18~ only.
27~18 only.

B060000 CAP.,FXD,CER DI:O.O01UF,10%,200V

B079999

B059999 CAP.,FXD,CEK DI:47OPF,10%,500V

BO

10 100
B080000
B020100
B060000
BOlOlOO

8079999 CAP.,FXD,CER DI:240PF,5%,500V

B059999 CAP.,E'XD,CER DI:240PF,5%,500V

B079999 CAP.,FXD,CER DI:470PF,10%,500V

CAP.,FXD,ELCTLT:22UE,20%,15V

CAP.

,FXD,CER DI :O. 001UF ,+loo-0%, 500V
CAP. ,FXD,CER DI :470PF, lo%, 500V
CAP.,FXD,CER DI:O.O01UF,10%,200V

CAP.

,FXD,CW DI:O.O01UF,10%,200V
CAP.,VAR,AIR DI:1.7-10PF1250V

CAP.,FXD,CER D1:27PFI4/-2.7PF,500V 72982 308-000COG0270K
CAP.,FXD,CER DI:O.O01UF,+lOO-0%,500V 72982 831-5163102P
CAP. ,FXD,CER DI:35PF,10%,500V
CAP. ,FXD,CER DI:O.O01UF,+100-0%,500V 72982 831-516E102P
CAP. ,FXD,CER DI:4.7PF ,+/-0.5PF,500V 72982 301-023COH0479D
CAP.,VAR,AIR DI:1.7-10PF,250V
CAP.,FXD,CER DI:lOOPT,+/-2OPFI500V 72982 301-000U2M010lM

CAP. ,FXD,CER DX:0.001UF,+100-0%,500V

CAP.,FXD,EZCfLT:22UFP20%,15V

CAP.,FXD,CER DI:O.O01UF,10%,200V

CAP. ,FXD,CER DI:O.O01UF,10%,200V

3~ee Mechanical Parts List

47~18 Option 1 only.

for

replacement parts.

72982 308-000COG0350K

74970 187-0106-005

57~18 Option 6 only.

REV.

H JAN. 1976

Electrical

7A18

Parts List-7A18/7A18N

Tektronix SeriallModel No.

Ckt

No.

Pnrt

No.

~341~ 283-0067-00 B080000 CAP.,FXD,CEK DI:0.001UF,10%1200V
~341 281-0580-00 B020100 B059999 CAP. ,k?XD,CER DI:470PF,10% ,500V
c3412 283-0067-00 B060000 CAP.,FXD,CER DI:0.001UF,l0%,200V
~345 281-0578-00 BOlO1OO B079999 CAP. ,FXD,CXR DI : 18PF ,5%, SOW
~345 283-0067-00 B080000 CAP.,FXD,CEK D1:0.001UF,10%,200V

~345~ 281-0578-00 BOZO100 8059999

~345~ 283-0067-00 B060000 CAP.,E'XD,CER DI:0.001UF,10%1200V 72982 835-515B102K
C356 283-0000-00 CAP.Il?XD,~R DI:O.OOIUFl+lOO-0%,500V 72982 831-516E102P
C364 281-0600-00 CAP.,FXD,CER DI:35PF,10%,500V 72982 308-000Cw0350K
C370 283-0000-00 CAP.,FXD,CER DI:O.OOlUF,+lOO-0%,50W 72982 831-5163102P

C398 283-0002-00 CAP.,FXBICER DI:0.01UF,+80-20%r500V 72982 811-54631032
C410 283-0001-00
C412 281-0557-00 CAP.,PXD,CER DI:1.8PF,10%1500V 72982 301-000COK0189B

C416 290-0512-00 CAP.,FXD,ELCTLT:22UF120%,15V 56289 196D226X0015KAl

C425 281-0638-00 BOlOlOO B079999 CAP. ,FXB,@ER DI : 240PF ,5%,500V 72982 30100025D24lJ

Eff

Dscont

Name

CAP.

,FW ,CER DI: 18~~~ 5% ,500~ 72982 301-050COG0180J

m.,FXD,CER DI:0.005UFI+~OO-0%,500V 72982 831-559E502P

&

Description

Mfr

Code Mfr Part Number

~425 283-0067-00 B080000 CAP.,FXIf,aR DI:0.001UF110%,200V
C425 281-0638-00 B020100 B059999 CAP. ,FXD,CER DI :240PP,5% ,500V

~425 283-0067-00 B060000 CAP.,FXD,CEH DI:O.O01WF,10%,200V

C427 283-0000-00 CAIP.,FXDICER ~1:0.001W,+100-0%,500V

C429 283-0000-00 CAP.,Fm,CER DI:O.OOIUFl+lOO-0%,500V

~441' 281-0580-00 BOlOlOO 8079999 CAP.
~441~ 283-0067-00 B080000 CAP.,FXD,CER DI:O.O01UF,10%,200V
c4412 281-0580-00 B020100 B059999
c4412 283-0067-00 B060000 CAP.,WD,mR DI:0.001UF,10%,200V
C445 281-0153-00 CAP.,VAR,AEK DI:1.7-10PF1250V

~446~ 281-0578-00 BOlOlOO 8079999 CAP. ,FXD,CER DI: 18PF, 5%, 500V
~446~ 283-0067-00 B080000 CAP.,FPIII,aR DI:0.001UF110%,200V
~446~ 281-0578-00 B020100 B059999 CAP. ,FXB,CEX DI: 18PF,5% ,500V
~446~ 283-0067-00 B060000 CAP.,FXDICER DI:O.O01W,10%,200V

C456 283-0000-00 CAP.,FXD,CZR DI:0.001UF,+100-0%,5OOV

C478 281-0523-00 CAP.,FXD,CER DI:lOOPFI+/-20PF1500V
C513 283-0000-00 W.,FXD,CER DI:0.001UF,+100-0%r50W
C518 290-0512-00
~525' 281-0638-00 BOlOlOO B079999 CAP. ,EIXD,CER DI : 240PF, 5%, 500V
~525' 283-0067-00 B080000 CAP.,FXD,CER DI:0.001UF,10%1200V

~525' 281-0638-00 B020100 B059999 CAP. ,FXD,eER DI: 240PFI5%, 500V
~525~ 283-0067-00 B060000 CAP.,PXD,CER DI:0.001UF,10%,200V
C527 283-0000-00 CAP.,FXD,CER D1:O.OOlUF,+100-0%~500V

,FXD

,CER DI : 470PF ,lo% ,500V

W.

,FXD,CEK DI: 470PF ,LO% ,500V

CAP.,1"XCt,ELCTLT:22UF120%,15V

'7~18 only.
27~18~ only.

Electrical Parts List--9A1817A18N

7A18

Tektronix SeriallModel No.

Ckt No. Part No.

...-..-y---.--...--"

C541. 281-0580-00 BOlOlOO B079999 CAP.,FXD,CER DI:470PF,10%,500V

E41

Dscont Name & Description

W,,FXD,CER DI:0.OOlUF,+100-0%,500V
WiP.,FXD,CER DI:35PF,10%,500V
CAP.,FXD,CER DI:0.001UF,+IOO-0%,500V

CAP.

,FXD,CER DI :4. BE',+/-0. SPF ,50W
CAP.,FXD,CER DI:~PF,+/-O.~PF,~O~V

SEIMICOM) DWICE:SI%SCON135V,100W
SEMICOPJB
SEMICOND
SEMICOND
SEMICOW

SEMICOWD
SEMICOM)
SEMICOND

DH11CE:SZLICON140PIV,150MA

DEVICE:SJLLICON140PIV,150MA

DEVIL'E:S~GICON,4OPIV,l5OMA

DWICE:SEZtlCON,35VI100MA

D~TLT:SPLICON,~OPIV,~~~MA

DeVPCE:SS%ICON,4OPIV,150W
DWPCE:SI;LXCON140PIV,150MA

Mfr

Code

--.--

04222
72982
04222
72982
72982

Mfr Part Number

7001-1374
835-515Bl02K
7001-1374
835-515B102K
308-000COG0270K

COXTdIRF:3.2UP(WOUND ON A 10 OHPi1,5%,0.5W RES)
COIL,w:3.2UF(WOUND ON A 10 0HM15%,0.5W RES)
COTL,RF:~.~UF(WOUWU
COXL,W:3,2UP(WOUND ON A 10 0HM15%,0.5W RES)
COfL1W:3.2UE(WW ON A 10 0HM15%,0.5W ReS)

COXL~FF:~.ZUE'(WOVND
COXX~,W: 3.2UF(WOW ON A 10 OHM,5% ,0.5W RES)
COXLIw:3.2UF(WOUED ON A 10 0HM15%,0.5W RBS)
COliLIHF:3.2UF(WOUND ON A 10 OHMt5%,O.5W RES)

Q2IOA,B 151-1032-00 TUSTSTOR:SILICON,FET,DU&
~220x13 253-0596-00 BOlOlOO 8079999 SEMICOND DVC SE:SILICON1NYN,2N3563
~220~1 153-0631-00 B080000 SEKICOND DVC SE:SILICON,NPN
~2202, 153-0596-00 B020100 B059999 BEMICOW DVC SE:SILICON1NPN,2N3563
~22021 153-0631-00 B060000 SEMICOND DVC SE:SILICON,NPN

Q225 151-0225-00 TRANSISTOR:SXLICONINPN
~240~ 153-0597-00 SERICOND DVC SE:SILICON,PNP
~250~ 151-0221-00 BOlOlOO B079999 TIWSISTBR:SILICON,PW
~250~~ 153-0597-00 B080000 SEMICOND DVC SE:SILICON,PNP
~2502 151-0221-00 B020100 B059999 TRANSISTOR:SILICON,PNP

~250~ I 153-0597-00 B060000 SEMXCOND DVC SE:SILICON,PNP
~2601 151-0225-00 BOlOlOO B039999 'TWSISTOR:SILICON,NPN
~260~ 151-0367-00 B040000 B079999
~260~ 151-0441-00 B080000 TMSISTOR:SILICON,NBN
~260~ 151-0225-00 B020100 B029999 ~SISMR:SILICON,NPN

~260~ 151-0367-00 B030000 B059999 ~SISTOR:SILICON,WN,SEL FROM 3571TT
~2602 151-0441-00 B060000 TWSISTOR:SlLICON,NPN

'7~18 only.
'7~18~ only.
3~22~

and

Q320

4~24~

and

5~~5~

and

furnished as a matched

Q340

furnished as a matched pair.

4350

furnished as a matched pair.

iP~SfSTOR:SILICON,NPNfSEL

pair.

ON

A

10

om15%,o.5w

ON

A

10 OHM,~%,O.~W

FROM 3571TP

RES)

RES)

Electrical Parts

7A18

List---7A18/7A18N

Tektronix SeriallModel No.

Ckt

No. Part No. Eff Dscont Name & Description

Mfr

Code Mfr Part Number

Q280 151-0221-00 TIIANSISTOR:SILICON,PNP
Q320 lt2 153-0596-00 BOlOlOO B079999 SEMICOND DVC SE:SILICON,NPN,2N3563
~320 153-0631-00 B080000 SEMICOND DVC SE:SILICON,NPN
Q3202t3 153-0596-00 B020100 B059999 SEMICOND DVC SE:SILICON,NPN,2N3563
~320

213

153-0631-00 B060000 SEMICOND DVC SE:SILICON,NPN

4325 151-0225-00 THANSISTOR:SILICON,NPN
~340~ 153-0597-00 SEMICOND DVC SE:SILICON,PNP
~3.50~ 151-0221-00 BOlOlOO B079999 TRANSISTOR:SILICON,PNP

~350

'1

153-0597-00 B080000 SEMICOWU DVC SE:SILICON,PNP

~350~ 151-0221-00 B020100 B059999 l~NSISTOR:SILICON,PNP

~350~

p5

153-0597-00 B060000 SEHICOWD DVC SE:SILICON,PNP 80009 153-0597-00
~360~ 151-0225-00 BOlOlOO B039999 THANSISMR:SILICON,NPN 07910 CS23365
~360~ 151-0367-00 B040000 B079999

TRANSISTOR:SILICONINPN,SEL

FROM 3571TP 80009 151-0367-00
~360~ 151-0441-00 B080000 THANSISTOR:SILICON,NPN 80009 151-0441-00
~360~ 151-0225-00 B020100 B029999 TRANSISTOR:SILICON,NPN 07910 CS23365

~360~ 151-0367-00 B030000 B059999

THANSISTOR:SILICON,NPN,SEE

FROM 3571TP 80009 151-0367-00
~360~ 151-0441-00 B060000 TRANSISTOR:SILICON,NPN 80009 151-0441-00
Q380 151-0221-00

TRANSISTOR:SILICON,PNP 80009 151-0221-00
Q41OA,B 151-1032-00 TRANSPSTOR:SILICON,FET,DUAL 17856 DN399
~420~ 16 153-0596-00 BOlOlOO B079999 SEMICOW DVC SE: SILICON,NPN,2N3563 80009 153-0596-00

~420~

r6

~420~

153-0631-00 B080000 SEMICOND DVC SE:SILICON,NPN

r6

153-0596-00 B020100 8059999 SEMICOND DVC SE:SILICON,NPN,2N3563
Q4203t6 153-0631-00 B060000 SEMICOND DVC SE:SILICON,NPN
~425~ 153-0595-00 SEMICOND DVC SE:SILICONtNPN,2N3563
~426~ 153-0595-00 SEMICOND DVC SE:SILICON,NPN,2N3563

~440' 153-0597-00 SEMICOND DVC SE:SILICON,PNP
Q4501 151-0221-00 BOlOlOO B079999 TRANSISTOR:SILICON,PNP
~450~

l9

153-0597-00 B080000 SEMICOND DVC SE:SILICON,PNP
~450 151-0221-00 B020100 B059999 TRANSISTOR: SILICON,PNP
~450

3'9

153-0597-00 B060000 SEMICOND DVC SE:SILICON,PNP

~460~ 151-0225-00 BOlOlOO B039999 TRANSISTOR: SILICON,NPN 07910 CS23365
~460~ 151-0367-00 B040000 B079999

SSPANSISTOR:SILICON,NYN,SEL

FROM 3571TP 80009 151-0367-00
~460~ 151-0441-00 B080000 TWLNSISMR:SILICON,NPN 80009 151-0441-00
~460~ 151-0225-00 B020100 B029999 ~SISTOR:SILICON,NPN 07910 CS23365
~460~ 151-0367-00 B030000 B059999

TRANSISTOR:SILICON,NPN,SEL

FROM 3571TP 80009 151-0367-00

~460~ 151-0441-00 B060000 TKANSXSTOR:SILICON,NF'N
Q480 151-0221-00 TKANSZSTOR:SILICON,PNP
Q5201t6 153-0596-00 BOlOlOO B079999 SEMICOND DVC SE: SILICON,NPN, 2N3563
Q5201p6 153-0631-00 B080000 SEMICOND DVC SE:SILICON,NPN
~520~'~ 153-0596-00 B020100 B059999 SEMICOND DVC SE:SILICON,NPN, 2N3563

Q52o3p6 153-0631-00 B060000 SEMICOND DVC SE:SILICON,NPN 80009 153-0631-00
~525 153-0595-00 SEMICOND DVC SE:SILICON,NPN,2N3563 80009 153-0595-00
~526~ 153-0595-00 SEMICOND DVC SE:SILICON,NPN,2N3563 80009 153-0595-00
~540' 153-0597-00 SEMICOND DVC SE:SILICON,PNP 80009 153-0597-00
~550~ 151-0221-00 BOlOlOO B079999 '~SISTOR:SILICON,PNP 80009 151-0221-00

~550~" 153-0597-00 B080000 SEMICOND DVC SE:SILICON,PNP 80009 153-0597-00
~550~ 151-0221-00 B020100 B059999 TRANSISTOR:SILICON,PNP 80009 151-0221-00
~550~~' 153-0597-00 B060000 SEMICOWD DVC SE:SILICON,PNP 80009 153-0597-00

~560~ 151-0225-00 BOlOlOO 8039999 TRANSISMR:SILICON,NPN 07910 CS23365
~560~ 151-0367-00 B040000 B079999

TRANSISMR:SIL%.CON,NPN,SEL

FROM 3571TP 80009 151-0367-00

4560' 151-0441-00 B080000 TRANSISTOR:SILICON,NPN 80009 151-0441-00
~560~ 151-0225-00 B020100 B029999 TRANSISTOR:SIZICON,NPN 07910 CS23365
~560~ 151-0367-00 B030000 B059999

'7~18

only.

2~220

and

Q320
'7~18~
4~24~
5~25~
6~420

only.

and
and
and

furnished as a matched pair.

Q340

furnished as a matched pair.

Q350

furnished as a mtached pair.

4520

furnished as a matched pair.

TliANSISTOR:SIS;PCON,NPN,SEE

7Q425, Q426, Q525

8~440

and

Q540

'~450

and

Q550

FROM 3571TP 80009 151-0367-00

and

Q526

furnished as a matched set.

furnished as a matched

pair.

furnished as a matched pair.

REV.

G

JUN. 1975

Electrical Parts List-7A1817A18N

7A18

Tektronix SeriallModel No. Mf

Ckt

No.

Part

No.

Q560 I 151-0441-00 B060000 ~NSISTOR:S1&XCON,NPN 80009 151-0441-00
9580 151-0221-00 TRANSISMR:SIZXCONIPNP 80009 151-0221-00

R225 315-0471-00 BOlOlOO
R225 315-0621-00
R225 315-0471-00 B020100 B059999 XES. ,FXD ,CMPSN:470 OHM,5%, 0.25W
R225 315-0621-00 B060000 RES.,FXD,CMPSN:620 OXM,5%,0.25W
R226 321-0122-00 RES.,FXD,FILM:l82 OHM,1%,0.125W

R227 315-0821-00 BOlOlOO B079999 RES. ,FXD,CMPSN:820 OHMV5%,0.25W
R227 315-0561-00 B080000 WS.,FXD,CMPSN:560 OHM,5%,0.25W
R227 315-0821-00 B020100 B059999 RES. ,FXD,CMPSN:820 OHM,5%,0.25W
R227 315-0561-00 B060000 RES.,FXD,CMPSN:560 OHM,5%,0.25W
R241 315-0241-00 BOlOlOO 8079999 RES. ,FXD,CMPSN:240 OH?4,5% ,0.25W

R241 315-0221-00 B080000 RIES.,FXll,CMPSN:220 OHM15%,0.25W
R241 315-0241-00 B020100 B059999 RES. ,FXD,CMPSN: 240 OHM,5%, 0.25W
R241 315-0221-00 B060000 RES.,FXD,CMPSN:220 OHM,5%,0.25W
R242 321-0068-00 XB080000 RES.,PW,FI'LM:49.9 OHM,1%,0.125W
R242 321-0068-00 ~060000 RES.,FXDIF$brM:49.9 OHM,1%,0.125W

""-

Eff

--

---.----------

BO8OOOO RES.,FXD,CMPSN:620 OHM,5%,0.25W

Dscont Name & Description Code

B079999 RES. ,FX19,CMPSN:470 0HMr5%,0. 25W

------

"-"

-------

---------

r

Mfr

Part Number

----"

----

R243 323-0255-00 R@S.,FXU,FIW:4,42K OHM11%,0.50W

R244 321-0126-00 RES.,FXD,FILM:200 OHM,1%,0.125W
R245 311-0634-00 RES.,VAR,NONWIK:500 OHM,10%,0.50W

R246 315-0103-00 BOlOlOO B079999 RES. ,FlYP),CMPSN:lOK OHM,5% ,O. 25W

R246 315-0912-00 B080000 RES..FXD,CMPSN:9.1K OW,5%,0.25W

R246l 315-0103-00 B020100 B059999 RES. ,E'XD,mSN:lOK
~246~ 315-0912-00 B060000 RES.,PXD,CMPSN:9.1K OHM,5%,0.25W
R250 321-0105-00 RES.,FXTl,PILM:121 OHM,l%,O.l25W
R251 321-0137-00 RES.,FXD,FILM:261 OHM11%,0.125W
R256 315-0471-00 RES.,FXTl,CMPSN:470 OHM,5%,0.25W

R27a2 315-0182-00 BOlOlOO B079999 RES. ,FXD,CblPSN:1.8K OHM,5%,0. 25W
~274' 315-0392-00 BOSOOOO RES.,FXD,CMPSN:3.9K OHM,5%,0.25W
~274' 315-0182-00 B010200 8059999 RES. ,FXD1CMPSN:1.8K OP.IM,5%,0.25W
~274' 315-0392-00 B060000 RES.,FXD,CMPSN:3.9K OHM,5%,0.25W
R275 315-0100-00 RES.,FXU,CMPSN:10 OHM,5%,0.25W

'7~18~ only.
27~1.8 only.

OHM,5%

,0.25W

REV.

G

JUN. 1975

Electrical Parts List--7A18/7A18N

7A18

Tektronix Serial/Model No.

Ckt No. Part No.

Eff

BOlOlOO
B020100

BOlOlOO
B080000

B020100
BO6OOOO
BOlOlOO
B080000
BOZO000

BOlOlOO
8080000
B020100

BOlOlOO
B080000
B020100

Dscont Name 8 Description

r

Mf

Code

Mfr

Part Number

B060000
BOlOlOO
B080000
B020100
B060000

BOlOlOO
B080000

BOlOlOO
8080000
8020100
B060000

'7~18 only.

27~18~ only.
37~18 option 1 only.

REV.

G

SUN.

1975

Electrical Parts List---"118/"P18N

7A18

Tektronix SerialIModel No.

Ckt No. Part No. Eff Dscont

--

~

Name & Description

R378 323-0189-00 RES.,FXD,FIIM:909 OHM,1%,0.50W
R380 315-0330-00 RES.,Fl(D,CMPSN:33 OHM,5%,0.25W
R382 323-0150-00 RES.,FXD,F'TLM:357 OHM,l%,O.SW
R384 316-0121-00 BOlOlOO B039999

RES.

,FXL),CMPSN:120 OHM,10%,0.25W

R384 315-0271-00 B040000 RES.,FXD,CMPSN:270 OHM15%,0.25W

R384 316-0121-00 B020100 B029999 RES. ,PXD,CMPSN:120 OHM,10% ,0.25~
R384 315-0271-00 B030000 RES.,FXD,CMPSN:~~~ 0HM15%,0.25W
R386 323-0206-00 RES.,FXD,FIT.M:1.37K OHM,1%,0.50W

R390 315-0470-00 RES.,FXDlCMPSN:47 OHM,5%,0.25W

R400 315-0152-00 RES.,FWICMPSN:1.5K OHM,5%,0.25W

~42.5~ 315-0471-00 BOlOlOO B079999 RES. ,FXD,CMPSN:470 OHM,5%,0.25W
~425 315-0621-00 B080000 RES.,FXD,CMPSN:BZO OHM15%,0.25W
~425 315-0471-00 B020100 B059999 RES. ,FW ,CMPSN:470 OHM,5% ,0.25W
~425 315-0621-00 B060000 RES.,FXD,CMPSN:620 OHM,5%,0.25W
R426 321-0122-00 RES.,FXD,FIPIM:182 OHM,1%,0.125W

Mfr

Code Mfr Part Number

~427~ 315-0821-00 BOlOlOO B079999 RES. ,FXD,CMPSN:820 OED4,5%,0.25W
~427~ 315-0561-00 B080000 RES.,FXL),CMPSN:560 OHM,5%,0.25W
~427~ 315-0821-00 B020100 B059999 RES. ,FXD,CMPSN:820 OHM,5%,0.25W
~427~ 315-0561-00 B060000 RES.,FW,CMPSN:560 OKM,5%,0.25W
~428~ 315-0241-00 BOlOlOO B079999 RES. ,FXD,CMPSN: 240 OHM, 5% ,0.25W

~428~ 315-0301-00 B080000 RES.,FXD,CMPSN:300 OHM15%,0.25W
~428~ 315-0241-00 B020100 B059999 RES. ,PXD,CMPSN:240 OHM,5%,0.25W
~428~ 315-0301-00 B060000 RES.,PXD,CMPSN:300 OHM,5%,0.25W
~4291 315-0821-00 BOlOlOO B079999 RES.,E'XD,CMPSN:820 OIfM,5%,0.25W
~4291 315-0561-00 B080000 RES.,FXD,CMPSN:560 OHM,5%,0.25W

~4292 315-0821-00 B020100 B059999 RES.,FXD,CMTSN:820 OHM,5%,0.25W
~4292 315-0561-00 B060000 RES.,FXD,CMPSN:560 OHM,5%,0.25W
R4411 315-0241-00 BOlOlOO B079999 RES. ,FXD,CMPSN:240 OHM,5% ,0.25W
~441~ 315-0221-00 B080000 RES.,FW),CMPSN:220 0IIMI5%,0.25W
~4412 315-0241-00 B020100 B059999 RES. ,FXD,CMPSN: 240 OHM,5%,0. 25W

R445 311-0634-00 RES.,VAR,NONWIR:500 OHM,10%,0.50W
~446~ 315-0392-00 BOlOlOO B079999 RES. ,FW ,WSN:3.9K OHM,% ,0.25W
~446~ 315-0623-00 B080000 RES.,FXD,WSN:62K OHM,5%,0.25W
~446~ 315-0392-00 B020100 B059999 RES. ,E'XD,CMPSN:3.9K OHM,5%,0.25W
~446~ 315-0623-00 B060000 RES.,F~,CMPSN:62K OHM,5%,0.25W

'7~18 only.
27~18~ only.

REV.

G

SON.

1975

Electrical Parts

7A18

List--7A1817A18N

Ckt

No. Part No.

Tektronix

SerialIModel No.

Eff Dscont

BOlOlOO B079999

B080000
B020100 B059999
B060000
BOlOlOO B079999
B080000

&

Description

Mfr

Code

Mfr Part Number Name

'7~18 only.
27~18~ only.

BOlOlOO B079999
B080000

BOlOlOO B079999
B080000

BO2OlOO B059999
B060000
BOlOlOO B079999
B080000
B020100 B059999

B060000
BOlOlOO B079999
B060000
B020100 B059999
B060000

XB090000

XB070000

BOlOlOO B079999

REV.

F

JUN.

1975

Electrical Parts List--7A18/7A18N

7A18

Tektronix

Ckt No. Part No.

-----.---

R545 315-0912-00

R545

R545 315-0912-00
R.550 323-0153-00
R551 321-0137-00

315-0103-00

SerialIModel No.

Eff

--"

B080000 RES.,FW,CMPSN:g.lK 0HM15%,0.25W
B020100 B059999 RES.,FXD,CMPSN:lOK OHM,5%,0.25W
B060000 RES. ,FXD,CMPSN:9.1K 0HM15%,0.25W

Dscont Name & Description

."-

------..-.-------

RES.,FXLlrFI1;M:383 OHMI1%,0.50W
RES.,FXD,PPW:261 0HM11%,0.125W

RES.

,E'XD,CMPSN:330 OHM,5%,0.25W
RES,,FXD,PILM:I..37K 0HM11%,0.50W
RES.,FW,CMPSN:47 0HM15%,0.25W

MICROCIRCUIT,DI:A
MICROCIRCUIT,DI:A

AND

AND

B LOGIC
B LOGIC

ML

ML

---

CHAN

SW

CHAN SW

Mfr

Mfr

Code

-

-"

-------

01121 a9125
01121 CB1035
01121 CB9125
75042 CECTO-3830F
75042 CEATO-261OF

Part

--.

Number

""----

BOlOlOO

BOlOlOO B039999 RES.,FXD,FILM:B.lgK OHM,1%,0.125W
B040000 ReS.,F'XD,FPl;M:12,7K OHM,1%,0.125W

'7~18 only.
27~18~ only.
37~18 option 1 only.

47~18 only, included with 672-0020-02 Attenuator Circuit Board Assembly.

B099999 CKT

BOARD

CKT

SMICOND
SEMICOND

RES.,FXD,FILM:2.05K 0HM11%,0.125W

RES,,FW,CMPSN:lSOK OHM,5%,0.25W
RES.,F1CB,CMPSN:75K 0PIM15%,0.25W

ASSY:mUT

BOARD ASSY :READOUT

DEVPCE:SILIC0N,40PN1150MA
DEVZCE:STETCON,40PZV,150MA

REV.

C

JKN.

1975

Electrical Parts List-.--.-7Al8/7A18N

7A18

SeriallModeI No.

Eff

Dscont Name & Description

Ckt

No. Part No.

Tektronix

Mf

Code

r

Mfr

Part Number

REV.

C

5UN.

1975

ON

7A18

Your instrument may be equipped with one or more options. This section describes those options, or

directs the reader to where the option is documented.

6

DC

Option

OFFSET:

Described in this section.

INFORMATION

Pages

4

f

7A18

ho

7A18

bsseirne

chassilei

dtrectlbt

VOL,TS,"DlV

DC

OFFSET

offset

to

wrlk

the

raspul

seCIlrlgu

Optr%~l"i

n~lharr

The

00

6

15

the

Input

fintcxnaf

each

eqwrpp~d

dynamac

06

Balance

amplalisr,

wath

range,

crrc~rits

whfch

added

with

prvos

DC

offset

urrceirbxated

haw

beer?

up

10

i

ccxcurls

front

~~"rdd100d

200

ddlvaslons

that

panel

LO

prsv~de

rrp

variable

puovrde

(131

baselane

to

up

offset

to

i

200

ddrvrsrons

controls

r

1

W

range

for

DC

of

each

offset

fur

ail

CONTROLS

l~alrel

Each

inp~if

The

var~allRe

formerly

I0

msjdsusemsrtta

lo-peak

treed

APP1-ICITION

b~

observed

drnpltarxdo

Separdte

GOU~XIIT~

controls

on

the

The

Ampllftes

of

peak

CH

1

&msd

CH

~e1ect01"

are

cor~centrac wvth

unsraradrfred

added

c%IBT;IIc~~~~B~.?cs

or

peak-to-greek

ttslrt

Offset

sw~t~h

fecniity

2

(uneallbratedl

has

an

ldd~t101781

the

postlion

shclil~iid

are

hrgh-Troqusncy

be

lXOf

SUD~&~/O

Vartable

controls

used

01'

pulse

Offset

PDSI~IOPI

only

luroffztiettsng

$0~

USB

wiravobarms

controls

tor

rrsplactmg

of

fh18

are

the

DG offset

the

BDENTlFV

a

DC

Cessed:

101"

oxcsedtng

added

lo

the

Ftonr

lunct~on

pushbuttons

trx

the

wavetofm

LU~Ifdeba~k'X

15

d~vrstons

type

peak-

Page

1

of

4

OPTION

7A18

6---.-7A18

CHARACTERISTICS

AMPLIFIER LINEAR OFFSET RANGE. Common-mode DC range of the input amplifiers is sufficientto

provide linear amplification of signals within

2

200 divisions.

normal 7A18 performance specifications at offsets of up to

EFFECTIVE VOLTAGE OFFSET. Effective voltage offset values for calibrated

follows (VARIABLE control in Cal position):

EFFECTIVE OFFSET

Direct

'Maximum input rating 250 V when direct coupled. Full offset range should not be used above 1 VIDIV.
'~aximum input rating of most probes is 500

.2

above

with 10X probe.

---

600 V. Full offset range should not be used at VOLTS/DIV settings

RANGE

VOLTS/DIV steps are as

With

XI0

Probe

CALIBRATION

horizontal graticule line.

DC OFFSET.

coupling to DC OFFSET and using the
voltage from OFFSET control R12
current-limiting resistor R320

input of Q220

CH

'The schematics of the Option

Page 2 of

CALIBRATION. Perform the following steps for checking Channel 1 and 2 OFFSET Range:
a. Reset the Input coupling to GND and the

b.

Set the standard amplitude calibratof for one-volt +DC output and set the input coupling switch to

c. CHECK---Using the OFFSET control, check that the trace can be returned to graticule center
d. Set the standard amplitude calibrator for a minus

e.

CHECK-Using the OFFSE'T control, check that the trace can be returned

CIRCUIT DESCRIPTION. DC levels of up to

(R22, CH 21, is applied to the base of Q320 (Q520, CH 2) through

(R520, CH

(Q420, CH 2). LED'S are inserted in series with both CR220 and CR221 (CR420, CR421,

2) to allow a larger voltage swing at the base of Q220 (Q420, CH 2).

6

circuits are shown on diagrams 1, 2 and

VOL'TS/DIV to 5 mV and position the trace to the center

(---)

one-volt DC output.

to

graticule center.

t200 divisions can be offset by switching the input

OFFSET control.. In the DC OFFSET mode, the selected offset

2).

This additional biasvoltage is used to balance the differential

3.

4

OPTION

7A18

6

--?A?@

OPTION

7A18

6

--7A18

Replacement part$ should be ordered from the Telrtronix Reid Office or Representative
Changes to Tektronix products give you the benefit of rmproved circuits and components. Please incfude
the rnslrument fype number and rerial number

BHB
BHS

CRT

cs

k

DE

FHB
FHS

HB

Fil

Fit

HS

Fig.

&

Index

No-

-

-

-1

------

Tektranix

Part

Na.

-

---- -

-

366-1319-00

213-0306-00

-2

333- 1939-00

-3 384-1313-00
311-1144-00

-4

------

-5 210-0583-00

REPLACEABLE

binding head brass

b~ndtng head steel
cafhode-ray rube
counfersun

double end

flat head

flat head steel

fillister head brass

fill~sfer head

SerialfModel

----

Eff

--

*

k

bras5

"

rtwi

Disc

--------

OPTIIOM

with

h he~ght
hex.
HHB hex head brass
HHS hex head
HSB hex socket brass
HSS hex socket

ID tnsrde d~ameter

lg

OD

Q

No.

t

Y

!?.3A

2

KNOB,gray-

-

each knob inclirdes

.

PAn'LI.,

SBAFT,extension,stepped
RESISlOR,var--5k
mounting hardware for each: (not irtcf uded wlresistor)
hUT,hex. ,0.25-32 X 0.312 inch

6

PARTS

each order for ports or service.

or

hexagonal

length or long
outsrde diameter

SEZSCREId,Z-56 X 0.062 inch,HSS

hrqh

sfeel

steer

-*---

ID

:

front

OH11

LIST

OH8

oval head brass
QHS oval head steel
PXB pan head brass
PHS pan head steel
RHS round head steel

SE

single end
THB truss head brass
TMS

truss

w

wide

Description

(R11

&

K12)

rn

yeur orea.

head steel

or

--

width

---

--

-*--"-"--

--

COUPLING,shaft,O.312 OD

.

each coupler Includes:

.

SETSCREW,4-40 X 0.094 inc'ti,HSS

X

0.438

inch

long

XOUNT,f lexible
mounting hardware for each: (not included wi'mounr)
SUT,hex, ,2-56 X 0.188 inch,STL
SGBEM.2-56 X 0,562 inch,S'iL
TUBt,spacer,0.296 ineh,long

BWE,shaf
RESISTOR,var-""5k OHM,lO turn

t

(R12

&

K22)
maunting harhare for each:(not included wlresistor)
NUT,hex. ,0.25-32 X 0.312 inch,STI,

WASWER,lock,internaL,0.261

ID

X

0,400 OD,STL

BRACKET,angle,component mtg
mounting hardware:(not included wibracket)
SCRElj,4-50 X 0.25 Inch,P?FtX,STL
POST,hex,,4-40 X 0.188 f 0,335 inch long

WAS11ER910ck,internal,0.

12

LD

X

0.26 Inch OD,STL

W,LED:2V,40A (DS220,DS221,US420 & US421)
RESISTOR,3.3k OW, tl4\<,5X (K320

&

R520)

WIRE,electrical,2 wire ribbon,24 inches long
WIRE,electrical,4 wire riblron,10.50 inches long

Page

4

of

4

Symbols

7A18

Electrical components shown on the dtagrar?"t\ are in the fnllowrng untt.; irnless

and

Reference

Designators

Capacitors

Resrstors

Value.; one or yteater are rn picoidrarfs (pF)

-

Verities

-

less than one are

Otrms

(121

rn

rioted

mirxr

otherwise

ofat ads

{pF)

Syi-rtbol5 irsecl on the cliaqtc>nis die based an

I-oqw s;ymboiogy

and

in~ty

diffct

T'he

fnilo~vrixj

rs

ft

orir

slwcial

,,,

based

011

the

rnani~farikrr

symbols

MIL

dre

irseri

STD-806B

ei

's data

on

<9

USA

Stanrlaid

in

terms ul pu.;rtrvc logic Logic symi,ols depict

the

d~ai$rar:i%

Glorkwlst:

Refer

Rcfcr

Corit>ccticxn solderccl

Connection made

Y32

2

1967

coa~troi intartor1 in ciitectton of arrow

to

citcigi

ain

nriri~ljcr intlrccrruci

to

t~,aveiorni r\~lii~i)f?r i~~dtc~iteci ~n

ra

tlrccirt board

ta

crr

cult

board w~th rnterconnectlnq prri.

iri

cftarnond.

t'i~?xdyor~

the

logic function performed

Biiie

Tfte tollowing ptefrx letters are

Assembly,

Artei~u~itur,

Motor

E3,ittrry

Cdr~acrtor, fixed or variable

Diode, signal or i ecttf re1 RT

Delay

Inciicatrng devtce tldmp)
Fuse TP

F~ltei

Heat

Hcatet

Crrnnectot , stationdry porrltrn

Relay
irlducior . f~xed or vartable

se~sdtable or tepdrrable icrtc~rt Iroatcj, elir

flxc~i

ltn~

riisstpatrng devir:e (heat srnk, heat iadlator, etc

or

vat

used

as referertce designiltois to rdentify components or assernblres on the cJ~agrams.

table

trnt

cncioses contyronerlts located on crt cirit hoard

i

1

)

nrluctor/re.;tstor combinatran

LR

Meter

M

Transistor

Q

Connector , r~iovable pot tron

P

Reststor,

R

Thermrslur
Stwttcia

S

Trdnsforiller

T

Tear potnt
Assernbty, Inseparable or non repaft abic (rntegratd

U

circurt,

Electroil tnbe

V

Voltage tequldto~ (retier diode, etc

VR

Crystal

Y

or

srlicon controlled I ectif ier

fixed

ot

vai rable

ti:

\

)

VOLTAGE AND WAVEFORM

7A18

TEST'

CONDITIONS

'Sypical voltage measurements were obtained under the
following
vtduat d~agrams:

conditions

unless noted otherw~se on the indl-

Voltmeter

1

YPe Non-loading digital

Input impedance
Range
Recommeniied type 'fektronlx 7013

(as used for voltages

on diagrams)

multimeter

10

MQ

0

to

1

ooa

vol

ts

D~gital Multimeter

?A18 (left vertical compartment)

DISPLAY MODE ALI

rRIGGER SOURCE MODE

CH

2

POLARITY hUP

CH

1

and

CH

2

10

VO

LTSID

I

V
COUPLING
POSI^I ION
VARIABLE
Signal Applied

mV
DC
Centered
GAL IN
No signal for voltage meas-

urements,
square wave from oscil­loscope Calibrator
applied to both input
connectors for wave-

forms.

40

mV

7A16 (right vertical compartment

using

a

10X probe with readout coding ring.

P6053

probe

used

for waveforms on diagrams)

7B70 (A Horizontal compartment)

LeveI!Slope

'Trigger~ng

&'lode
Coupiing
Source

Magnifier

TimeiDiv

Variable
Ext

Trig In connector

Vert~cal Mode Right
Horizontal Mode A

A

lntens~t~ Optimum

B

Intensity Counterctockw~se

Calibrator

Volts

Rate

A Trigger Sotrrce Right Vert

B Trigger Source

All voltages
are in
photographs taken
System.
the actual deflection factor from the probe tip. Voltages
and waveforms on

absolute and may vary between instruments because of

component tolerances,
settings. Readouts are

giver? on the diagrams are in volts. All currents

milltamps Waveforms shown are actual waveform

wlth a rektronix Oscilloscope Camera

Vertlcal deflect~on factor shown or1 waveform

the

diagrams (shown in blue) are not

Internal cal~brat~on or front panel

s~mulated In latger than-normal type.

Centered on positive

slope

AU to

P-P

AC

Ext

X

1

1

ms
Cal In
No connection for voltage

measurements. For

waveforms Sig Out from

osc

i

l loscope connected
to Ext Trig In connec­tor.

40

mV

I

kHz

Left Vert

NOTE

IS

Polarity
Bandwidth
Position
Coupling
Variable

+UP
Full
Centered
AC
Cal

In

The spring tension of the pin sockets ensures a good

connection between the circuit board and pin. Phis
spring
sockets as

tension may be damaged by using the pin

a

connecting point for spring-loaded probe

tips,

all(qator clips, etc.

>

7A18

INPUT

SOURCE

I

I

INPUT

I

I

r

m

!

'

COUPLIhG

L

I

I

I

ATTENUATORS

FOLLOWER

PARAPMABE

CASLODE

AMPLIFIER

)

GAlN

AND

VARIABLE

CONTROLS

SECOND

CASCODE

AMPLIFIER

EMlTTER

FOLLOWER

-

-

m

SIGNAL
OUTPUT

0

COtJPL

IDENTIFY

I

I

IUPUT

A

-

v

SlOOB

I
I

I!

IG

ATTEN8J4TORS

lNPUf

SOURCE

FOLLOWER

PARAPHASE

CA5CODE

AMPClFlER

)

GAlN

AND

VARLABLE

CONf

ROLS

+

52COY

LASCODE

AMPLIFIER

D

C-

EMITTER
FOLLOWER

9560

7

-

-

S30AtB

DlSPLAY

TRIGGER

*

TRLGGER

)

CUANNEL

SWITCH

Ud70

MODE

S3VRCE

5

@

TRIGGER

OUTPUT

Q

580

+

TRIGGER

OUTPUT

-

-

!

READOUT

ENCODlNCU

)

9620

4

L

7

-

L

lNT

ERFACE

CONNECTOR

CHANNEL

TIME-SLOT

2

OUT

At/

7A18

GNO/

AC

GND

DC

QFF5ET

5100A

DC/

DC

OFFSET

(SHOWN

IN

AC

PO5lT

ION)

>=+

A1

ATTENUATOR BOARD

CHANNEL

1

CHANNEL

INPUT

TO

4210

1

SIGNAL

CHANNEL

20

pF

2

1

PROBE

TO

C4557

~A~~J~AIBN

OPTION

COOING

0

6

CIRCUIT

1

SWITCHING IDENTICAL

CHANNEL

TO

CHANNEL 1 ABOVE

2

I

ATTENUATOR

@

5%

7A18

Fig.

Amplifier Circuit Board

7-1A.

Assembly,

Option

6.

@

XI00

7A18

ATTEM ATTFN ATTEN

CIIB

crrq

CII~

crr~

CIIO

CIII

CIOG

t107

CHANNEL

INPUT

TO

R210

1

SIGNAL

CHANNEL

IM*

20

pF

523

2

PROBE

TO

T-oor

I

PROBE

TO

CODlhlG

CR357

COblNG

C9557

0

CIRCUIT

<

SwlTC~lhlG

CHANNEL

IDENTICAL

CHANNEL

1

TO

CHANNEL

2

1

ABOVE

M

7AIE

ONLY

ATTENUATOR

@

mgF/

z,2

hq

Moved

7A18

7A18 SN

7A18N

6080000

SN

6060000

REV. E MAY

7976

*See

Pam

serial

number

Fig.

7-1. A2 Amplifier

List

tor

ranges.

Circuit

Board

Assembly

(front

view).

Moved

7A18

7A18N

SN

SN

8080000

8060000

1

'See

Pans

List

serial

Fig.

number

7-2.

far

rang=.

A2 Amplifier Circuit Board

Assambly

(back

view).

7A18

CHANNEL

1

INPUT

AMPLlFlEg

9

7A18

7A18

7Al8/7~

18~

REV.

F,

IIZ~-"CS

MAY

1916

CHANNEL

1

INPUT

AMPLIFIER

@

7A18

4

7A18

CHANNEL

SIGNAL

TO

U210@

PIN

I

2

7~

1

~/~AIB

N

P/O

A2

AMPLIFIER

BOARD

CHANNEL

BELOW

SNBC6000

1

INPUT

AMPLIFIEIL

0

REV.

-

TRIGGER

SIGNAL

TO

U470

@Ih9

~PR

I974

PIN

@

IS

5N

7A18

7Al8

812\620+

OYLV

-.

UP

*

'C.

DC

CIIAWNEL

OFFSET

5

\OOA

2

-

CII'

"

(0

"141.

,r

pa"--

r

-,

-

,FFI'-

.

f"l'.r?

-

L

la-

1-1

J

*

Y*

MATCHED

4

MATCHED

721

,

2

TURN

PAIR

TPAMSIS

QUAD

TOPS

FILAR

P/O

A2

7~18/7~143~

OPTlOhl

AMPLIFIER

6

BOARD

REV.

7\26

F,

MAY

-

1976

26

CHANNEL

2

INPUT

AMPLIFIER

@

5::

7A18

?A18

7A18

ONLY

REAbOUT

SEE

?I

:LlJFS

:3,

,vci'.~.?

r:?

m-..

A2

PARTS

LIST

,'l'ilD

c:'

-1~

-6~

iMPLIFIER

SFRI:

.pn:'Tq

ox'

For)

!.

P'l

01,

~',LLI:-,

BOARD

EARLIFP

I'Ian"E

1

-'

iL;

-7)

MATCHED

+

4

MATCHED

r

u

TZl, 2 TURN

-,.

,,..

?./

,.,,

..

,<,,

,.

.*

REV,

,.-,

,1.,...

,)

.,,,

H , MAY

PAIR

TRANSISTORS

QUAD

,,,,>,:,,.,

I

,',.,

--,

,,,..,l.I,.

.

I

978

..,,

.,,,.

1

FILAR

<,,,

,,

.,,(..,.,"

,,,,

,,.,.,

2F

1

DISPLAY

@

I

.(

R.E.C.

CHANNEL

SNB060000

2

-

INPUT

UP

AMPLIFIER

@

474

S

30A

MODE

[

"

7A18

"\

es,

\&

1

-

7A18

WAVEFORMS

--

-

-

-

-

OCII~IIIP,~

-

~lndi-l

-

cnnn#llon%

--

-1

7A18

CHANNEL

7A18

FROM

SIGNAL

R264,

0

1

R3b4

CHAUNEL

FROM

CHANNEL

TRIGGFR

FROM

SIGNAL

R4b4,

RZ64.

2

RS64

1

R364

-510

SIGNAL

LI-lANNf

2

:

SWITCH

L

I

'i'

P/O

A2

AMPLIFIER

BOARD

CHANNEL

TRIGGER

FROM

R4b4

ADD/ALt

FPOH

~AIB/?A\BN

2

RSL4

53OB

@

d

I0

roo

-r

TRIGGER

CHGNNEL

SWITCl4

CHANNEL

REV.

APR.

1974

SWITCHES

m3'"hq

,

7A18

TO

"270

PIN

4,

@

ADD TO

PIN

14,

@

7A18

38

7A18

31

36

35

34

33

<A

<-

<

<

<

/-

CH

tH

TS-2

UORMAL/INVERT

2

COLUMU

I

COLUMN

)

1

FROM

530A

.&

-

FROM

READOUT

5304

@-

PLUG-IN

r

bEClMAL

MODE

->

TS-I->

>

>

B

38

37

3

6

35

34

33

32

3

1

30

29

28

2

7

FROM

CHANNEL

IDENTIFY 513

'1

10

20

JV

50

::

1

.5

v

5

:J

I

I

I

I

I1

I

1

I+:.:*

0'

11

I

I

I

I

I

[

I

I

I

I

I

I

I I

I

I

I

I

I

I1

I

11

I

I

I
I

I

I

I

I

I

1

R640

75K

-

f

:z9

1

=

RL4b

150K

-

-

-

-

'2"

5237

C*L

UNCAL

TO CH

b

READOUT

""A

I

ROW

6

>

1

B37

I3

'2-

I

I

to<

9

6

5

<A.

<­<

<++

f

TQIGGER

FROM

+

SIGNAL

FROM

CHOP-ACT

CHOP

DRIVE

SIGNAL

Q5BO

4380

COMMON

@

@

-TRIGGER

FROM

Q480

FROM

ALT-

SIGNAL

-SIGNAL

9280

IlRIVE

IS

->

I'

FROM

10

IDENTIFY S23

9

1

b

P/O

A2

AMPLlFlER

BOARDS

CHANNEL

0'

CUANPIEC

NO7

loPr\or\

2

CIRCUIT SWITCH IDENTICAL

CHANNEL

1

USED

ABOVE

CHANNEL

L

READOUT

I

'

5

IOOC

TO

.*ullTH

2

READOUT

(7'~

le

7,4IB-?fiC)A

TO

ONL~

READOUT

9620

(7ALB

ONLY)

rS7

"'"f

-

TO

READOUT

'530A

INVERT

CH

7

2

@

?A

18/7~18~

REV.

1\26-35

E,

JUNE

I976

CONNECTORS

i

READOUT

@

m9L<3

REPLACEABLE

7A18

Section 8--7A1817A18N

MECHANICAL

PARTS ORDERING INFORMATION INDENTATION

Replacement parts are available from or through your local

Tektronix, lnc. Field Office or representative.

Changes to Tektronix instruments are sometimes made to
accommodate improved components as they become available,
and to give you the benefit of the latest circuit improvements

PARTS

SYSTEM

This mechanical parts list is indented to indicate item
relationships. Following is an example of the indentation system
used in the description column.

12345

Assembly

andlor Component

Name & Description

developed in our engineering department. It is therefore Attaching parts for Assembly andlor Component
important, when ordering parts, to include the following

-__*___

information in your order: Part number, instrument type or Detail Part of Assembly andlor Component
number, serial number, and modification number if applicable.

a

part you have ordered has been replaced with a new or

If
improved part, your local Tektronix, Inc. Field Office or
representative will contact you concerning any change in part

Attaching parts for Detail Part

---

---

Parts of Detail Part
Attaching parts for Parts of Detail Part

---

---

number.

Change information, if any, is located at the rear of this

manual.

Attaching Parts always appear in the same indentation as

the item it mounts, while the detail parts are indented to the right.

Indented items are part of, and included with, the next higher

SPECIAL NOTES AND SYMBOLS

XOOO

OOX

Part first added at this serial number

Part removed after this serial number

indentation, The separation symbol
attaching parts.

Attaching parts

must

be purchased separately, unless otherwise

-

-

- ' - -

-

indicates the end of

specified.

FIGURE AND INDEX NUMBERS

Items in this section are referenced by figure and index
numbers to the illustrations.

#

ACTR
ADPTR
ALIGN
AL
ASSEM
ASSY
ATTEN
AWG
BD
BRKT
BRS
BRZ
BSHG

CAB
CAP
CER
CHAS
CKT
COMP
CONN

cov

CPLG
CRT
DEG
DWR

INCG
NUMBER SIZE
ACTUATOR
ADAPTER
ALIGNMENT
ALUMINUM
ASSEMBLED
ASSEMBLY
AITENUATOR
AMERICAN WIRE GAGE
BOARD
BRACKET
BRASS
BRONZE

BUSHING
CABINET
CAPACITOR
CERAMIC
CHASSIS
CIRCUIT
COMPOSITION
CONNECTOR
COVER
COUPLING
CATHODE RAY TUBE
DEGREE
DRAWER

ELCTRN

EPL
EOPT
EXT
FIL
FLEX
FLtl
FUR

FA

FSTNR
FT
FXD
GSKT
HDL
HEX

HEX
HEX SOC
HLCPS
HLEXT
HV

IC

ID
{DENT
IMPLR

.

-

FLECTRON
El

FCTRICAL
ELECTROLYTIC
Fl EMENT
FI FCTHICAL PARTS
EQUIPMENT
EXTERNAL
FILLIS7 ER HEAD

Fl

FXIBLF
FLAT HEAD
FILIEH
FRAME
FASTENER
FOOT

FIXED
GASKET
HANDLE
HEXAGON
HEXAGONAL HEAD

HD

HEXAGONAL SOCKET
HELICAL COMPRESSION
HELICAL EXTENSION
HIGH VOLTAGE
INTEGRATED CIRCUIT
INSIDE DIAMETER
IDENTIFICATION
IMPELLER

In the Parts List, an ltem Name is separated from the
description by a colon
Name may sometimes appear as incomplete. For further Item
Name identification, the
can be utilized where possible.

ABBREVIATIONS

IN INCH
INCAND INCANDESCENT

INSUL

INTL INTERNAL
LPHLDR LAMPHOLDER
MACH MACHINE
MECH MECHANICAL

MTG MOUNTING

NIP

NON WIRE NOT

OED ORDER BY DESCRlPrlON

OD OUTSIDF DIAMETkR

OVH

PHBRZ PHOSPHORBRONZE

PL PLAIN

PLSTC PLASTIC

PN PART NUMBER

PNH PAN HEAD

PWR POWER

RCPT RECEPTACLE

RES RESISTOR

RGD

RLF RELIEF

RTNR RETAINER

SCH SOCKET HEAD

SCOPE OSCILLOSCOPE

SCR SCREW

or

LIST

FRONT

INSLJLATOR

NIPPL E

WIRE WOLJND

OVAL HEAD

or

PLATE

RIGID

ITEM NAME

(:).

Because of space limitations, an ltem

U.S.

Federal Cataloging Handbook H6-1

SE SINGLE END
SECT SECTION
SEMICOND SEMICONDUCTOR

SHLD SHIELD
SHLDR SHOULDERED

SKT SOCKET

SL SLIDE

SLFLKG SELF-LOCKING

SLVG

SPR SPRING

SO SQUARE

SST STAINLESS

ST L STEEL

SW

T TUBE

TERM TERMINAL
THO THREAD
THK THICK

TNSN TENSION
TPG TAPPING

1

RH TRUSS HEAD

V

VAR VARIABLE
WI WITH
WSHR WASHER

XFMR TRANSFORMER

XSl R TRANSISTOR

SLECVING

SWITCH

VOLTAGE

STkEL

REV.

E

NOV. 1974

Mechanical

7A18

Parts

List---SA1817A18N

CROSS

INDEX

MFR.

CODE

NUMBER

MFR.CODE MANUFACTURER ADDRESS

GFTTIG ENGINEERING AND MANUFAC?TJRING CO.

AMP, INC.

EXAS INSTRUMENTS, INC.
SEMICONDUCTOR GROUP

SPECTW-STRIP CORP.

FREEWAY CORP.
ESNA LTD.
BERG ELECTRONICS, INC.

GAVITT WIPE AND CABLE, DIVISION OF
RSC INDUSTRIES, INC.

SPECIALTY CONNECTOR CO.
MICROWAVE INSTRUMENTS
NATIONAL RIVET AND MFG.
ALLEN MFG. CO.
ALLIED STEEL AND CONVEYORS, DIV. OF
SPARTQN
AILMETAL SCREW PRODUCTS CO. , INC.
FISCHER SPECIAL MFG.
HOM-KROME

LAVELLE

OAK INDUSTRIES, INC., SWITCH DIV.

ILLINOIS TOOL WORKS, INC.
SHAKEPROOF DIVISION
WALDES, KOHINOOR, INC.
C-W INDUSTRIES
TEKTHONIX, INC.
CENTRAL SCREW CO.
GAVITT WIRE AND
RSC INDUSTRIES, INC
N. L. INDUSTRIES, INC. , SOUTHERN SCREW
DIV.

INDUSTRIAL RETAINING RING CO.

COW.

co.

RUBBER CO.

CABLE,

,

,

INC.

&

COMPONENTS, INC.
CO.

CO.

DIVJSION OF

.

P.

0.

BOX

3608

P.

0.

BOX 5012

LAMPSON

7100
9301 ALLEN DR.
10 ESNA PARK DR.

YOUK EXPRESSWAY

455 N. QUINCE ST.
3560 MADISON
6600 BOMBARDIER ST.
1-21 EAST JEFFERSON

P.

0.

DRAWER 570

17333 HEALY
821 STEWART AVE.

446 MORGAN ST.

31

BROOK ST. WEST
424 N. WOOD
S. MAIN ST.

CHARLES ROAD

ST.
47-16 AUSTEL PLACE

550 DAVISVILLE RD.

P.

0.

BOX 500

2530 CRESCENT DR.

CENTRAL ST.

P.

0.

BOX

57 CORDIER ST.

1360

TO

Am.

AVE.

MANUFACTURER

CITY

.STATESZIP

SPRINGMILL, PA 16875
HARRISBURG, PA 17105

DALLAS, TX 75222
GARDEN GROVE, CA 92642
CLEVELAND, OH 44125
MARKHAM, ONTARIO, CANADA
NEW CUMBERLAND, PA 17070

ESCONDIDO,
INDIANAPOLIS, IN 46227

ST. WAUPUN,

MONTREAL 4 58 QUE CAN

HARTFORD,

DETROIT, MI 48212
GARDEN CITY, NY
CINCINNATI, OH 45206
HARTFORD, CT
CHICAGO,
CRYSTAL LAKE,

ELGIN, IL 60120

MNG ISLAND CITY, NY
WARMINSTER, PA 18974
BEAVERTON, OR 97077
BROADVIEW, IL 60153

BROOKFIEID,

STATESVILLE, NC 28677

IRVINGTON, NJ 07111

WI

CT

IL

CA

92025

53963

06101

06110

60622

IL

MA

11530

60014

11101

01506

REV. F

JUN

1975

Fig.

7A18

&

Index Tektronix SerialIModel No.

No. Part No. Eff Dscont

214-1095-00

105-0076-00
214-1280-00
214-1054-00
105-0075-00

348-0235-00
333-1411-00
333-1596-00
337-1064-00 BOlOlOO
337-1064-04 B030000
131-0679-00 l~~l~l.~~ B020099X
131-0126-00

220-0569-00 BOlOlOO

----.-

3

-."--em

136-0252-04 BOlOlOO
136-0252-04 B054200
136-0350-00 B054200
131-0566-00
200-0945-00
200-0945-01
211-0001-00
136-0260-02
124-0162-00
355-0046-00
262-0928-00

B029999

B020099X

B054199

Mechanical Parts List--7A18/7A18N

123

4

-

KNOB: LIGHT GRAY

.

KNOB

.

PUSH
KNOB :GRAY

.

SETSCREW:5-40 X 0.125 INCH,HEX SOC STL

KNOB :GRAY

.

SETSCREW:5-40 X 0.125 INCH,KEX SOC STL

KNOB

.

SETSCKEW:5-40 X 0.125 INCH,HEX SOC STL

KNOB : GRAY

.

SETSCREW:5-40 X 0.125 INCH,HEX SOC STL

KNOB: LEVER SWITCH

KNOB: LATCH
KNOB

PIN,SPG,SPLIT:0.094 OD X 0.187 INCH LONG

REL BAR, LATCH:PLUGIN
SPRING,HLCPS: 0.14 OD X 1.126"L,O.l6"DIA

SPRINGl DE1ENT:LATCH
PAWL:0.475 X 0.21 X 0.184 INCH,PLSTC
SHLD GSm, EXEC : 4.734 INCH LONG
PANEL, FRONT:
PANEL,
SHLD,SIDE,ELEC:PLUG-IN
SHIELD,ELEC:RIGHT SIDE
CONNECTOR, FCPT, : BNC W/HARDWARE
CONNECTOR, RCPT

NUT,

BUSHINGlPLASTTC:0.257 113 X 0.412 INCH OD
RES ISPIOR, VARIABLE
RESISTOR, VARIABLE

NUT,PLAIN,HEX. :0.25-32 X 0.312 LNCH,BRS

WASKER,LQCK:INTL,O.062 IDX 0.253 OD,STL

SWITCH, SLIDE :DPDT, 0.5A1 125VAC

SCREW,MACHINE:2-56 X 0.25"82 DEG,FLH STL

NUT,PMIN,HEX. :2-56 X 0.188 INCH,BRS

SUBPANEL, FRONT

SCR,TPG,THD FOR:6-32 X 0.50 INCH,PNH STL

CKT BOARD ASSY:AMPLlFIER (SEE A2 EPL)

.

CONTACT, ELEC : 0.188 INCH LONG

.

CONTACT, ELEC :O. 188 INCH LONG

.

SOCKET, PLUG-IN: 3 PIN,LOW PROFlLE

.

LTNKITERM.CONNE:0.086 DIA X 2.375 INCH L

.

COVER,HXtF XSTR:FOR DUAL TQ-18 CASE

.

COVER,HALF XSTR:FOR DUAL TO-18 CS,2-56 THD

.

SCREW,MACHINE:2-56 X 0.25 INCH,PNH STL

.

SOCKETIPLUG-IN:16 CONTACT,LOW CLFARANCE

.

TEWINAL BOARD:4 NOTCH

. .

.

SWITCH,PUSH:GAIN (CH1,CHZ ,WIRED)

.

NUT,PLAIN, HEX. :O. 25-32 X 0.312 INCH,BRS

.

WAS~RILQCK:INpP1;,0.26 ID X 0.40" OD,STL

5

-

SETSCREW:5-40 X 0.125 INCH,HEX SOC STL

:GRAY

SETSCREW:5-40 X 0.125 INCH,HEX SOC STL

BUTYON :GRAY

:RED

:

LATCH

FRONT

PLAIN,KNURL: 0.50-28 X 0.2 35 INCH BRS

MOUNT,TERM. BD:0.577 INCH H

Name & Description

-

.

(ATTACHING PARTS)

---*---

:

,

:

BNC , FEMA1;E

(ATTACHIWG PARTS)

---*---

:

W/HARDWARE

(ATTACHING PARTS)

---*---

(ATTACHING PARTS)

---*---

:

(ATTACHING PARTS

---*---

(ATTACHING PARTS)

---*---

-

UNIT

)

W

Mfr

Code

--

80009

74445

80009

74445
80009
80009
74445
80009
74445
80009
74445
80009
74445
80009
80009
80009

83385 OBD
73743 2x12157-402

87308 OBD

22526 75060
22526 75060

80009 136-0350-00
OOOOC

80009 200-0945-00

80009 200-0945-01

83385 OBD

01295
80009 124-0162-00
80009 355-0046-00

80009 262-0928-00

Mfr Part Number

"..

366-1163-00

OB D

366-1165-00
OBD
366-1059-00
366-1077-00
OBD
366-0494-00
OBD
366-1308-00
OB D
366-1299-00
OBD
366-0215-02
366-1058-24
366-1058-46

G2007-1

C931602

'7~18 only.
27~18~ only.

3~efer to Electrical Parts List for part number.

REV.

J

JUNE 1976

Mechanical Parts List--7Ai8/7Ai8N

7A18

Fig.

&

Index Tektronix Serial/Model No.

Part

No.

-"

1-45 262-0926-00

-46 175-0825-00

-47 175-0828-00

-48 175-0830-00

-51 407-0553-00

-52 407-0912-00

-53 376-0039-00 BOlOlOO 8029999

-54 376-0125-00

-71 200-1297-00

-73

-74 136-0252-04

-75 210-0799-00 BOlOlOO B099999

-76

No. Eff Dscont

260-1221-00

376-0152-00' B030000
213-0075-00

213-0048-00 BOlOlOO
213-0022-00 B065220
354-0251-00

672-0020-003 BOlOlOO B049999
672-0020-013 B050000 B099999
672-0020-02 BlOOOOO
672-0480-004

----

-

-----

136-0252-01 3(B100000

210-0779-00 BlOOOOO

131-1031-00

~

B065219

3

BOlOlOO B099999

123

4

5

.

SWITCH,ROTARY :TRIG SOURCE/DISP MODE (WIRED)

. .

SWIEH,ROTARY:

. .

WPm,ETZC'I'RICALO.833 FT 2 WIRE RIBBON

.

.

WIRE,EMECTRICAL2.833 FT 5 WIRE RIBBON

. .

W1KElET8CTRICAL:7 WIRE RIBBON

.

NUT,PLAIN,HEX. :O. 375 X 0.438 INCH,STL

.

WASmR,LOCK:INm,O. 375 ID X 0.50" OD STL

.

BRKT, CMPNT MTG:

.

BRKT, CMPNT MTG

.

ADPT,SHAFT, CPLG:O. 128 AND 0.082 "DIA SHAFT

.

COUPLING SHAFT:

.

.

SETSCEW:4-40 X 0.094 INCH,HEX SOC

.

COUPZER, SWITCH:

.

SETSCREW:4-40 X 0.125 INCH,HEX SOC STL

.

SETSCREW:4-40 X

.

RING,COUPLING:0.251

.

COUPLER, SWITCH:

.

SETSCREW:4-40 X 0.125 INCH,HEX SOC STL

.

RMGlCOUPLING:0.251 ID X 0.375 INCH OD,AL

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS
SCREW,MACHINE :4-40 X 0.188"100 DEG,FLH STL

NUT,BLOCK:O.38 X 0.25 X 0.282"OA

COVER,

AT'TEN.

SCREW,MACHm:4-40 X

WASHER,FEAT:0.125

WASHER,PLASTIC:0.187 ID X 0.312 INCH OD
CONTACT,

TERMImL, LUG: 0.125 ID X 1.125 INCH TANG

NW,PIAIN,EXT W:4-40 X 0.25 INCH,STL
SCT(EW,MACHINE :4-40 X 0.25" 100 DEG,FLH STL

BRACKET :CIRCUIT BOARD

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

NUT,PLAIN,EXT W:4-40 X 0.25 INCH,STL

SHIELD, EIAEC :ATT%NUATOR, FRONT

SCR,'I'PG,Tm FOR:2-32

CKT BOARD ASSY:ATlENUATOR/READOUT
CKT BOARD ASSY : ATTTNUATOR/K3ADOUT

CKT BOARD ASSY :ATlENUATOR/RF:ADOuT

CKT

.

.

a

. .

.

.

. .

. .

ELEC :GROUNDING

BOARD ASSY :ATTENUA4K)R (2

COVER:CAM SWITCH

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

CE'

BOARD

CONTACT, Eh3C:O.

.

CONTACT, EIJ3C:O. 178 INCH LONG

.

EYELET,METALLIC:O.295 OD X 0.362 INCH L
RIVET,TWBULAR:0.051 OD X

CONTACT ASSY,EL:CAM SW'lX!H,TOP

Name & Description

(ATTACHING PARTS)

---*---

:

(ATTACHING PARTS)

0.188

INCH,HEX SOC STL

ID

---*---

(ATTACHING PARTS)

(ATTACHING

:

ID

---*---

(AmHING PARTS FOR EACH)

X 0.375 INCH OD,AL

PARTS

FOR

0.188

INCH,PNH S?X

X

0.25" OD,STL

CKT

---*---

(ATTACHING PARTS)

---*---

(ATTACHING PARTS FOR

X

---*,--

(ATTACHZNG PARTS)

0.188

)

---*---

ASSY:READOUT (SEE A3 EPL)

188

INCH LONG

EACH)

INCH,PNH STL

0.115

INCH LONG

SL

BD

ASSY)

Mf

r

Code

-.-----

262-0926-00

5-41981-411
TEK-175-0825-00
TEK-175-0828-00

TXK-175-0830-00

407-0553-00
407-0912-00
376-0039-00
376-0152-00
OBD
376-0125-00

OBD
OBD
354-0251-00

OBD

354-0251-00

OBD
OBD
220-0547-01
200-1199-00
OBD
OBD

OBD

131-1075-00

210-0288-00

OBD
OBD

OBD
OBD

OBD

Mfr

Part

Number

----

l~erial

2~erial number break

37~18 only.

47~18~

number break

only.

is

is

for

7A18N. Serial

for

7A18N.

Serial

number

number break

break

for

for

7A18
7A18

is

B440000. XB066940

is

XB066940.

REV.

I

JUNE 1976

Fig.

7A18

&

Index Tektronix Seriai/Model No.

No. Part No.

-.------.-

1- 131-1031-00 BlOOOOO

-81 354-0391-00 BOlOlOO
354-0390-002 B050000
354-0443-002 B050000

-82 401-0081-02 BOlObOO B049999
401-0180-002 B050000
210-0406-00
214-1139-003

-83
214-1139-02
214-1139-03

-84 105-0242-00 BOlOlOO B049999
105-0242-01 B050000

-85 105-0241-00 BOlOlOO 8049999
105-0241-012 B050000
384-0878-01 b050000
384-0880-01 %050000

-86 401-0115-00 BOlOlOO B049999
401-0178-002 B050000

-87 441-0992-00 BOlOlOO BOlOlOO

441-0992-04~ B020000

214-1127-00 BOlOlOO
214-1752-002 B050000
210-0591-00

337-1406-00
136-0252-01

210-0779-00

131-1031-00
131-1030-00

----."

..-

Eff

-_-4

Dscont

B049999

B049999

Mechanical

123

4

5

.

.

CONTACT ASSY,EL:CAM SWITeH,TCSP

.

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

.

SHIELD, ELEC :CAM SWlTCH

.

SCR,TPG,

.

SCREW,MACHINE:2-56 X 0.25 INCH,PNH STL

.

ACTUATOR ASSY :ATTENUATOR SWI'TCH

.

.

AC'rnAMR,SWITCH:

.

.

SCREW,= SCH:2-56 X 0.37SS'HEX HD STL

.

.

RING, RETA1NmG:O. 395'TREE

.

.

RING,WTAINING:0.338 ID X 0.025" TXK,STL

.

.

RING,PETAINING:0.328 FREE IDX 0.448 OD

.

.

BEARWG,CAM SW:FRONT

. .

BEARING,CAM SW:FRONT

. .

NUT,PLAIN,HEX.:4-40 X 0.188 INCH,BRS

.

.

SPRING,FLAT:GOLD COLORED

.

.

SPRING,FLAT:

. .

SPRING,FLAT:RED COLORED RED COLORED

.

.

DRUM CAM SWITCH:AC GND DC

. .

DRUM

.

.

.

.

. .

.

.
. .
.

.

.

CHASSIS:

.

CHASSIS:

.

NUT,PLAIN,HEX. :2-56 X 0.188 INCH,BRS

.

SCREW,MACHINE:4-40 X 0.312 INCH,PNH STL

.

WASEER,LOCK:INTL,O.l2

.

POSP,E6;EC-MECH:HEX,O.333

.

WASlfER,LOCK:JNTL,O.12

.

WLLER,DETENT:O. 125 DIA X 0.125 INCH

.

ROLLER, DETENT:

.

NVl'l~X:4-40 X 0.188 fNCH

.

SHXJ),ELECTRICAL:CAM CONTACTS

,

CONTACT,EEC:O. 178 INCH LONG

.

RIVET,TU5UXJAR:0.051 OD X 0.115 INCH LONG

.

CONTACT ASSY, EL:CAM SWITCH, TOP

.

CONTACT ASSY, EL:

.

CKT

.

SCR1mG,THD FOR:2-32 X 0.250 INCH,PNH STL

.

WAS~R,LOCK:INTZ,O.O92 ID X 0. 17SmOD,STL

.

WASmR,FEAT:0.09 ZD X 0.25 INCH OD,BRS

.

NUT,PLALN,EEX. :2-56 X 0.188 T.NCH,BRS

SCflEW,MACHINE:4-40 X 0.25 XNCIirPNH STL
POST:4-40 X 0.875 INCH

CAM

DRUM

CAM

DRUM

CAM
SHAET,CAM SW:FKONT
SHAFT:INmmEDlATE:
BWRING,CAM SW:CENTER
BWRING,CAM SW:~NTER/~R

BOARD

Name & Description

-"

----"

(AWACHING PARTS FOR CKT BD ASSY)

-,,*---

(ATTACHING PARTS FOR EACH)

THD

FOR:2-56 X 0.312 INCH,PNH STL

---*-,-

(ATrfACHTWG PARTS)

---*---

ID X 0.025'' STL

GREEN

COMWD

SWEC!R:AC GND DC

SWIEH:VOL~TS/DIV

SWIEH:VOLTS/DIV

(AWACHING PARTS)

---*---

(ATTACHmG PARTS FOR EACH)

---*-,-

CAM

ASSY

(ATTACHmG PARTS)

(ATTACHJNG PARTS FOR CKT BDS)

SWmCH, BOT11OM

:AT'I'ENUATOR

KNG

'GREEN

1B

X 0.26"OD,STL

INCH LONG

XD

X 0.26"OD.STL

(SEE

AX

COLORED

EPL)

Parts List--7A18/7A18N

Mfr

Code

80009

L

Mfr Part Number

,----

131-1031-00

OBD

OB D
OBD

105-0243-00

OBD

2x12157-402
OBD
1204-00-00-0541C

214-1127-00
214-1752-00
OBD
337-1406-00
1-332095-2
FA-29952715
131-1031-00
131-1030-00

OBD
OED
OBD

2x12157-402

OBD

129-0080-01

-

--.--

""

l7~38 only.
'serial number
3~lace with
47~18~ only.

REV.

H JUNE 1976

break

part

bearing the

is

for 7A18N only.

same

PANEL, REAR:

SCR, TPG, THD FOR:6-32 X 0.50 INCH,PNH STL
SPAmH,SLEEVE:O.18 ID X 0.25 OD X O.IO''L

Serial

color code

rimer

as

(AT'TACHING PARTS)

---*---

for 7A18 is B060000.

the

original in your instrument.

OBD

361-0326-00

Mechanical Parts List-.---7A18/7A18N

7A18

Fig.

&

Index Tektronix SeriallModel No. Mf

No. Part No.

Eff

Dscont Qty

123

4 5 Name

FR

SECT, PLUG- M :BOTTOM

FR

SECT, PLUG-IN

SPRING,

EXTENSION
WIKE, ET%CTXICALO.
WIRE, ELECTRICAL
WIRE, ELECTRICAL : 3 WIKE RIBBOEJ
WIRE,ELECTIIICAL:4
WIPIE,ELECTRICAL2.833 PT
WIRE,
WIRE,

GROUND :FLAT

LmCTRICALO. 585

ELECTRIGALO. 542

:TOP

SHAET:0.124 OD X 6,843 INCH LON

:

833

3

WIRE

WlKE

&

Description

FT

2

RTBBIF310N

RIBBON

5

FT

6

F'l'

9

WIRE

WSKE

WIRE RIBBON

WIRE

RIBWN

RIBBON

RTBBm

r

Code

Mfr Part Number

l7~18~ only.
27~3,~ only.

Black

7A18

reference numbers denote

are not common to both instruments.

parts

which

REV. F AUG

1976

7A1817A18N DUAL TRACE AMPLIFIERS

Fig.

7A18

&

Index Tektronix Serial/Model No, Mfr

No. Part No.

--".-"

Eff

"

Dscont

Qty

123

.".

4

5

Name & Description Code

--.-.-...--v.-,-.

."

"..

Mfr

Part Number

- -

7A18/7A18N DUAL TRACE AMPLIFIERS

MANUAL CHANGE INFORMATION

7A18

At Tektronix, we continually strive to keep up with latest electronic developments
by adding circuit and component improvements to our instruments as soon as they
are developed and tested.

Sometimes, due to printing and shipping requirements, we can't get these
changes immediately into printed
change

information on following pages.

nranuals. Hence, your manual may contain new

A single change may affect several sections. Since the change information

are carried in the manual until all changes are permanently entered, some

duplication may occur. If no such change pages appear following this page, your
manual is correct as printed.

SERVICE

Because of the universal parts procurement problem, some electrical parts in your
instrument may be different from those described in the Replaceable Electrical Parts
List. The parts used will in no way alter or compromise the performanceor reliability

of this instrument. They are installed when necessary
the customer. Order

replacement

parts from the Replaceable Electrical Parts List.

NOTE

to

ensure prompt delivery to

sheets

CALISWATION

7A18

TEST

EQUIPMEW

REPLACEMENT

Calibration

This chart compares

Test

Equipment

1-M

Chart

500

product performance to that of older Tektronix equipment. Only those

characteristics where significant specification differences occur, are listed. In some cases the new instrument

be

a

may not

total functional replacement. Additional support instrumentation may be needed or a change in

calibration procedure may be necessary.

--"-*--*

DM 501 replaces 1013

-

PG 501 replaces 107

PG 502 replaces 107

,--.

----

"-"

108
111

-----

--"

PG 501 - Rtsetime less than 3 5 ns tnto
PG 501 - 5 V output pulse, 3 5 ns Rtsettme

PG 501 - Rtsettme less than 3 5 ns, 8 ns
PG 501

PG 501

.

"----*

PG 502 - 5 V output
PG 502

PG 502
PG 502

PG 502

50

Pretr~gger pi~lse delay

-

25

-

Does not have Palred, Burst, Gated,
or Delayed pulse mode,
Offset Has

---

-

Rtsettme less than 1 ns, 10 ns

Pretrtgger pulse delay

-

15 V output

-

Does not have Palred, Burst, Gated,
Delayed
Has

-

Does not have Paired or Delayed

pulse Has

at least 1 V; High Amplitude

Cornoarison of Main Characteristics

-*------------.--

n

V output

15 V dc

out-

-

----

&

15 V output

15 V output

"-------."-

Undelayed pulse mode;

r

5

V output.

---

--,"

------

--

107 - Risetime less than 3.0 ns into

108 - 10 V output pulse; 1 ns Risetime.
11 1 - Risetime 0.5 ns; 30 to 250 ns

-

114
115

-

.--,,-

..

~---"

"

108 - 10 V output.
11 1 - Risetime 0.5 ns; 30 to 250 ns

114
115

-

2101

-

106

0502-01 - Comparator output can be alter-

*

50

n.

Pretrigger Pulse delay.

t

10 V output. Short proof output.
Paired, Burst, Gated. and Delayed
pulse mode;
Short-proof output.

Pretrigger pulse delay.

-

:t10 V output. Short proof output.

-

Paired, Burst, Gated, Delayed & Un­delayed pulse mode; i10 V output.
Short-proof output.
Paired and Delayed pulse; 10
output.

Positive and Negative-going trigger
output signal, 50 ns and 1 V; High
Amplitude output, 100 V.

nately chopped to a reference

-,------"-~"..-*%---

-?.I0 V output.

*-*-*------

-,--*"

V

SG 503 replaces 190,

NOTE:

All

TM

500 generator outputs are short-proof. All

190B - Amplitude range 40 mV to 10 V p-p.

180A - Marker outputs, 5 sec to 1 ps.

Sinewave available at 20, 10,

and

2

Trigger output - slaved to marker
output from 5
One time-mark can be generated at a Multiple time-marks can be

wave available at 5, 2, and 1 ns.
Trigger output
output from 5
One time-mark can be generated at

wave available at 5, 2, and 1 ns. Sinewave available to 50, 10,
Trigger output
output from 5
One time-mark can be generated at

sec through 100 ns. 100 Hz;

181 - Marker outputs, 1, 10, 100, 1000,

184 - Marker outputs, 5 sec to 2 ns. Sine-

-

slaved to marker

sec through 100 ns. of 1 and

2901 - Marker outputs, 5 sec to 0.1 ps.

-

slaved to marker

sec through 100 ns.

TM

500 plug-in instruments require

ns. Trigger pulses 1, 10,

I.

10, and 100 kHz.
generated
and 10,000
wave available at 50, 20, 10, 5,

and 2 ns. Separate trigger pulses

10 and 1

vides positive or negative time

marks of 25
intervals of 1 and
and .1 ms: 10 and 1 ps.

and
from 5

Multiple time-marks can be
rated simuitaneously.

simultaneously.

ps, plus 10 ns sinewave.

.I

sec; 10, 1, and .1 ms;

ps. Marker amplifier pro-

V

min. Marker

.1 sec: 10,

5

ns. Separate trigger pulses,

sec to 0.1 ps.

TM

500-Series Power Module.

1,

gene-

REV.

A,

OCT

1975