EG&G 113 Operating And Service Manual

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MOEL

MODEL

113

113

LOW-

LOW

PREAMPLIFIER

PREAMPLIFIER

SEE SAFETY

S

EE

PRECEDNG

PRECEDNG SECTION I

BEFORE

BEF ORE OPERATING INSTRUMENT

OPERATING

NOISE

-NOISE

SAF ETY NOTIC E

INSTRUMENT

NOTICE

SECTION

I

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OPERATING

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HF ROLL

300

100\

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AND SERVICE

AND

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LOW-NOISE

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OPERATING AND INSTRUCTION MANUAL

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PREAMPLIFIER

NOl.l.OH.l.SNl

NOJ.

33NIHd

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£1855“L?

9Nl.l.VH3dO

M113; 1/83·900·RAU

(;;n~EGc..G

PRINCETON

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HSION

an

Copyright

© 1983 EG&G PRINCETON APPLIED RESEARCH

APPLIED

‘M01

1a<1ow

RESEARCH

Printed In U.S.A.

SHOULD

SHOULD

A. Contact

A.

B.

B.

C.

C.

D.

D.

E.

E.

YOUR

YOUR

Contact the factory (609/452·2111) or your local factory

representative

representative

will be possible

be

will

problem

problem to a particular plug·in

If it is

necessary

If it is necessary

tory,

we need the following

tory, we need the

(1)

Model

(1)

Model number and serial number.

(2)

Your

(2) Your name (instrument user).

(3)

Your

(3)

Your address.

(4)

Address

(4) Address

(5)

Your

(5)

Your telephone number and extension.

(6)

Symptoms

(6) Symptoms (in detail, including control settings).

(7)

Your

(7) Your purchase order number for repair charges (does

not apply

not apply to repairs in warranty).

(8)

Shipping

(8) Shipping

ment by

ment

transportation).

transportat ion).

U.S. CUSTOMERS—Ship

U.S.

CUSTOMERS-Ship

to:

to:

EG&G

PRINCETON

EG&G

PRINCETON APPLIED RESEARCH

7

Roszel

7 Roszel Road

(Off

Alexander

(Off Alexander Road, East of Route

Princeton,

Princeton, New Jersey

CUSTOMERS

CUSTOMERS OUTSIDE OF

customs

customs clearance of equipment being returned, please

contact

contact

complete

complete shipping information.

Address

Address correspondence to:

EG&G PRINCETON

EG&G

PRINCETON APPLIED RESEARCH

P.

O. Box

P.

O.

Box

Princeton,

Princeton,

Phone:

Phone:

TELEX:

TELEX:

EQUIPMENT

EQUIPMENT

the

factory

possible

to a

number

name

address.

telephone

purchase

by

Road

New Jersey

clearance

the factory

the

factory or the nearest factory

shipping

correspondence

2565

2565

NJ

NJ

609/452-2111

609/452·2111

84 3409

84

3409

(609/452-2111)

to

discuss

to

discuss the problem.

to

expedite

to

expedite servicing

particular

to which

to

to repairs

instructions

instructions

any method

any method other than normal surface

Road,

OUTSIDE OF

08540

08540

plug-in

to

send any

to

send any equipment back to the fac·

following

and

serial number.

(instrument

instrument

which instrument should

number

(in detail,

order

APPLIED

East of

of

equipment

or

the nearest

information.

APPLIED

REQUIRE

REQUIRE SERVICE

the problem.

including

numberfor

in

warranty).

(if

(if you wish to authorize ship·

the equipment

the equipment being returned

to:

or your

servicing

circuit

board.

circuit

board.

equipment

information.

information.

user).

should

and

extension.

control

repair

you wish

other

than normal

RESEARCH

Route 1)

1)

U.S.A.—To

U.SA-

RESEARCH

To avoid delay in

being returned,

factory distributor

In

by localizing

by

to authorize

local

many

In

many cases it

localizing the

back

be returned.

be

settings).

charges

being

avoid

distributor

SERVICE

factory

cases

the

to

fac-

the

returned.

(does

ship-

surface

returned

delay in

please

for PROVIDED FOR HEREIN

it

for

WARRANTY

WARRANTY

EG&G

PRINCETON

EG&G

PRINCETON APPLIED RESEARCH warrants each in-

strument

strument

and workmanship.

and workmanship. Obligations under

limited to

limited to replacing, repairing

price,

price, at our option, of any instrument returned, freight

prepaid,

prepaid,

original purchaser,

original purchaser, provided prior authorization

has been

has been given by our authorized representative.

This Warranty shall

This Warranty shall not apply

spection shall

spection shall disclose to our satisfaction, has become defec·

tive or

tive

dent, alteration, negligence,

dent, alteration, negligence, improper installation

causes

causes beyond our control. Instruments manufactured by

others, and included In

others, and included in

covered by this Warranty

covered by

warranty which

warranty which is extended

restrictive.

restrictive. Certain subassemblies, accessories

ponents may

ponents may

which

which case such exclusions are listed in the

Manual

Manual supplied with each instrument.

We

We

without

without

previously

previously purchased.

THERE ARE

THERE

DESCRIPTION

DESCRIPTION HEREIN. THIS WARRANTY IS

EXCLUDES

EXCLUDES ANY AND

SENTATIONS, EXPRESSED,

SENTATIONS, EXPRESSED, IMPLIED

CLUDING

ClUDING

ANY AND

ANY AND ALL OTHER OBLIGATIONS

EG&G

EG&G

NOT LIMITED

NOT

NO PERSON,

NO

ASSUME FOR EG&G

ASSUME

ADDITIONAL OBLIGATION

ADDITIONAL OBLIGATION

PROVIDED

CUTED BY AN OFFICER

CUTED

RESEARCH.

RESEARCH.

of its manufacture

of

its manufacture

replacing,

at our

to our factory

to

olJr factory within ONE year

given by

unworkable due

or

unworkable due

beyond our control. Instruments

this

Certain

case such exclusions

supplied

reserve

the right to

reserve the right to make changes in design at any time

incurring anyobligation

incurring any obligation

purchased.

NO WARRANTIES

ARE

ANY

MERCHANTABILITY

MERCHANTABILITY AND FITNESS,

ALL OTHER

PRINCETON

PRINCETON APPLIED RESEARCH, INCLUDING, BUT

LIMITED

PERSON, FIRM

FOR

FOR

BY

APPLIED

Obligations

repairing

option, of any instrument

provided

our authorized representative.

not apply

disclose

or supplied

Warranty but carry the original manufacturer's

is extended

subassemblies,

be specifically

be

specifically excluded from

with each instrument.

NO WARRANTIES WHICH EXTEND BEYOND THE

HEREIN. THIS

AND ALL OTHER WARRANTIES

All

APPLIED

TO, SPECIAL

TO,

SPECIAL

FIRM OR CORPORATION

OR

PRINCETON APPLIED

EG&G

PRINCETON APPLIED RESEARCH ANY

HEREIN EXCEPT

AN

OFFICER

RESEARCH

to be free

to

be free from defects in material

under

giving

or

or

giving credit for the purchase

within

ONE year

prior

authorization

to

any

to

to our satisfaction,

to abuse, mishandling,

to

or

but carry

make changes

OBLIGATIONS OR

CORPORATION

any instrument which

abuse, mishandling, misuse, acci·

improper

supplied

with our equipment,

with

the original

to our customers

to

our customers and may be more

excluded

are listed

to install

to

WHICH EXTEND

WARRANTY

OTHER WARRANTIES

IMPLIED

AND FITNESS,

RESEARCH, INC_UDING,

OR CONSEQUENTIAL DAMAGES.

OR

CONSEQUENTIAL DAMAGES.

OR LIABILITY

OR

LIABILITY NOT EXPRESSLY

EXCEPT IN WRITING

OF EG&G PRINCETON

OF

EG&G PRINCETON APPLIED

warrants

from defects

this

Warranty

this

credit for

of delivery

of

instrument

has

installation

our equipment, are not

accessories

from this Warranty,

in the

in design

install same on

1

IS IN LIEU OF, AND

OR STATUTORY, IN-

OR

OR

IS

IS

IN

WRITING DULY

in material Q

Warranty shall

the

returned,

delivery

for

such

for

such return

which

become

misuse,

manufactured

manufacturer’s

and may

this

Warranty, in

Instruction

Instruction

at any time

same on

BEYOND THE

IN

LIEU

OR REPRE-

OR

STATUTORY, IN·

AS WELL

AS

LIABILITIES OF

LIABILITIES OF

AUTHORIZED TO

AUTHORIZED TO

RESEARCH ANY D

NO“ EXPRESSLY

DULY EXE-

each in-

shall

be

purchase

freight

to the

to

the

return

our

in-

our

defec-

acci-

or other

or

other

by

are

not

be more

or com-

or

com-

units

units

OF, AND

REPRE·

AS

WELL

AS

BUT

EXE-

APPLIED

be

in·

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in

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CHARACTERISTICS

Introduction

1:1

Specifications

1.2

INITIAL

2.1

2.2

2.3

OPERATING

3.1

3.2

3.3

CHECKS

Introduction
Equipment Needed
Procedure

INSTRUCTIONS

ntrodu

I

cti on
Noise and Source Resistance
Grounding

3.4 Signal Voltage and Gain
Dc Zero Adjustment

3.5
Overload Fast Recovery

3.6

Low-Pass/High·Pass Filters

3.7
Single-Ended/Differential Operation

3.8
Common-Mode Rejection

3.9

Input

3.10

Maximum

Signal Consistent

3.11 Battery Operation, Test,

Rack Mounting

3.12

Input

3.13

3.14

Using a Signal
Use

of

the Model 113 in Bio-Medical Applications

Transformer

DESCRIPTION

Block

4.'

Diagram Discussion

4.1A

Input

Coupling Circuit IV-1

4.1B Ground·Loop Suppression

Gain Determination

4.1C

4.10

' '

4.2

Rolloff

4.1

E Overload Fast-Recovery

4.1

F Power Supply

Circuit

Differential Preamplifier (A

4.2A

Output

4.2B

Power Supply

4.2C

Battery Test

4.2D

ALIGNMENT

Introduction

5.1
Preliminary

5.2

Equipment Needed

5.3
A2

5.4

5.5

5.6

5.7

5.8

5.9

TROUB

6.1

6.2

6.3

FET
Common-Mode Rejection Adj.
Gain Calibration

Low

Frequency

High Frequency

Battery Test Calibrate

LESHOOTI

Introduction

Procedure

Printed Circuit Soldering

Filter

Circuit

Descriptions

Amplifier

Circuit

Circuit

PROCEDURE

Gate Source Zero Adj.

Rolloff

Rolloff

NG

SCHEMATICS

TABLE

and

Dc Zero Adjustments

with

and

Charging

Circuit

1)

(A2)

Compensation

Compensation

OF CONTENTS

Linear Operation

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Page

1-1
1-1
1-1

11-1
11·1
11·1
11-1

111-1
111-1
111-1
111-2

111-2
111-3
111-3
111-3
111-4
111-4
111·5
111-5
111·6

111-12

IV-l
IV-l

IV-1

IV-1

IV-'
IV-2

IV-2
IV-2
IV-2
IV-3
IV-3
IV-3

V-l
V-l
V·l
V·1
V·1
V-l

V-'
V-2

V·2
V-2

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VI-l
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Number

Number

FIGURES

FIGURES

' Page

•

Page

1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9A
1-98
1-10
1-11
1-12A
1-128
1-13
1-14
1-15

1-16
11-17
11-18
11-19
11-20

V-1

V-l

VI-1

VI-l

Typical

Typical Noise Figure Contours

ypical Recovery

Typical Recovery

Filter

_P

LP

Filter

Filter

HP

HP

Filter

_P/HP

LP/HP

Typical

Typical Common Mode Rejection Characteristics

Vlaximum

Maximum Differential

Vlodifying

Modifying

Frequency

Frequency Response

Noise

Figure

Noise Figure Contours

-'0

Schematic

Schematic

Photographs

-'1

Photographs

Frequency

-'2A

Frequency Response

Noise

-'28

-'3

-20

Figure

Noise Figure Contours

Model

Model

Phot0ofModelAM-2

Photo

Frequency

Frequency Response

Noise

Figure

Noise Figure Contours

Model190Schematic

Model 190 Schematic . . . . . . .

Photograph

Photograph

B-H

Curve

B-H Curve & Waveform

Degaussing

Degaussing Waveforms . .

Ground-Loop

Ground-Loop

Solder

Solder Removal

Figure

Noise

Normalized

Normalized

Normalized

Normalized

Filter

Normalized

Filter

Normalized

Common Mode

Differential

the

the

Response

Contours for

Model

of

of

Model

of

of

Response

Contours

AM-2

Schematic, Turns Ratio

AM-2

Schematic, Turns Ratio 1: 100

of

Model

Response

Contours for

Contours

Time vs

Time

Amplitude

Amplitude

Amplitude

Amplitude

AM-1

Transformer for

AM-l

Transformer

of Typical Model

of

AM-1

AM-l

Model

AM-1

Model

AM-l

of

of

AM-2

of

of

Low Frequency Rolloff

vs

Low

Phase

Phase

Rejection

Input

to Model 113

Input

to

Typical Model

Typical

for

Typical Model

Transformer

Transformer

Transformer

Transformer

Typical

Typical Model AM-2 Transformer .

for Typical Model

for

Typical Model

................

. . . . . . . . . . . . . . .

Typical

Typical Model 190 Transformer

Typical

for

Typical Model 190-113 System

...............

of Model

of

&

Waveform

Waveforms

Removal

Current

190 Transformer

Model 190 Transformer

. . . . . .

.

. .

Path

Current Path

byWicking .

by

Wicking

.

for

for

Frequency

Transfer Curve

Transfer Curve

Transfer

Transfer Curve

Transfer

Transfer Curve

Characteristics

Model 113

for

Model AM-2 Transformer

Model

Model

the

the Model 113

113

Rolloff

Curve . .

Curve

. . . . . . . . .

with

Use

Use

Model

1:100

AM-1

AM-l

the

with

the Model 113 Preamplifier

Transformer . . . . .

Transformer .

AM-1

Transformer

AM-l

Transformer

(Unmodified)

(Unmodified)

. . . .

.......

AM-2 Transformer

AM-2

Transformer

. . . . .

.....

190 Transformer

Model

190-113 System

.

.

.

. .

. .

. .

. . . . . . . .

Model

. . .

113

. .

.

.

. . .

. . .

.

. .

. . .

.

. .

Preamplifier

. .

. .

. . .

. .

. . . .

. . .

. ll 1

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.

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SAFETY NOTICE

‘l

(Read Before Operating Instrument)

A. INTRODUCTION

The Model 113

(“1oH__ao 3/\q'1 03'nv:>

applies has been supplied in a safe condition.
This manual contains some information and warn­ings

that
safe operation and to retain the instrument in a
safe condition.

q,Oq,,,,ONO:,G3,q,M,,q,OWWNZN

N

have to

1 5:5.

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3 .

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The described apparatus has been designed for
indoor use.

B.

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INSPECTION

Newly received apparatus should be inspected for

qo

sueew Aq

shipping damage. If any is noted,
PARC and
save the shipping container for inspection by the

A OZZ H.LIM

carrier.

file

a claim

NOACIEINHHJ.

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As defined in IEC Publication 348 (Safety Require-

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ments

Model 113, when operated from the ac line, is
Class I apparatus, that is, apparatus that depends
on connection
ground for equipment and operator safety. Before
any

other

the

protective connection is made via the earth
ground prong
cord plug shall

provided

EIAVH

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use

of
ductor, by use

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WISE A SAFETY HAZARD FROM ELECTRICAL
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DEATH, MIGHT RESULT.

When operated from

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considered Class
in which protection against electric shock relies
on supply at safety extra-low voltage (SELV) and in
which voltages higher than those

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POWER CORD

POWER

VOLTAGE

VOLTAGE SETTING. Depending on the switch

position,

position, either

the

the switch) will be visible

operation

operation from a line voltage

ac,

ac, the switch should

For

For operation from a line voltage

230 V

230

E. LINE

E.

The Model

The Model 113 line fuse is located inside the in-

strument.

strument. To check or replace the fuse, it is first

necessary

necessary

shield

shield mounted on the inside

The

The fuse should be a slow-blow type rated at
either

either 1/16 A (115 V Operation) or 1/32 A (230 V sion

operation).

operation). The voltage rating should
higher in the case

higher in the Case 01 115 V Operation and 250 V or characteristics

higher in the case

hiélherththe eeee Qt 230V0DeFeti0i1-9h|YeBU$$

MDL

MDL OF equh/eteht

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ARD FRQM E|_ECTR|CA|_ SHQCK wi-ii(3i-i (3QUi_|3 and

ARD FROM ELECTRICAL SHOCK WHICH COULD

REsui_T |N INJURY OR DEATH, |)|$(;()Ni\|EcT operating

RESULT

THE PQWER CORD BEFQRE REM()V|NG QR |i\|- one

THE POWER CORD BEFORE REMOVING

$"i'Ai_i_|N(3 A FU$E_ i3E(;Ati$E QF Ti-ii; PQTEN- general use.

STALLING A

T|A|_ HAZARD, Ti-ii; FUSE Si-|()U|_[) BE CHECKED considered

TIAL HAZARD, THE

AND/OR

ANDIOR CHANGED

"|'E(3i-i|\ii(3iAN ()Ni_Y_ plifiers

TECHNICIAN ONLY.

A prooeoure for geinino eooeee to the fuse operating

A procedure for gaining access to the fuse

follows.

follows.

(1) Remove the top oover_ it is eeoureo by e general,

(1)

(2)

(2)

(3) After oheokino eno, it eppropriete, ohenging any

(3)

F.

F.

In

the

In

the past few years, safety

plications

plications has been a matter

to

to

equipment.

equipment. It has long been known that electrical

currents

currents passing through the heart can interfere

CORD WHEN CHANGING THE LINE

either “115”

switch)

from

switch

the

operation

“23O”

ac,

V ac,

"230"

LINE FUSE

FUSE failure,

To

mounted

fuse

should be a

1/16 A

or

equivalent fuse should be used.

AVOID

AVOID THE POSSIBILITY OF A SAFETY HAZ-

IN

CHANGED

Remove the top cover. It is secured by a

single screw

Single screw on the bottom surface

oover “tip” et the reer of the inetrument_ with agination

"lip"

cover

screw removed,

the

the screw removed, the cover simply slides

back

to

back to where

ment_ The

ment.

Remove

Remove the shield attached to the inside

rear panel. This shield is secured by

the rear panel. This shield is secured by a

the

einoie eorew at its oenter_ with the ehieio ed

Single screw at its center. With the shield

removeo, the iuee hoioer, iooeteo oireotiy unnecessary risk

removed, the fuse holder, located directly

above

above the Line Voltage Selector switch,

becomes accessible.

becomes accessible.
After checking and,

fuse, remount

the

the fuse, remount the shield and top cover

before

before plugging in the line cord and operating

the inetrument_ 113

the instrument.

OF THE MODEL

USE

USE OF THE MODEL 113 IN

BIO-MEDICAL

BIO·MEDICAL APPLICATIONS

past

both

the

both the users and suppliers

passing

WHEN CHANGING

SETTING.

"115"

will

a line

should be set

from

should show. use

should show.

113

line

check

remove

to

to

remove the top cover and also the

be

on

Depend'ng

(both

“230”

or

or

"230"

visible

voltage

be

a

line

fuse

replace

or

the

the

(both

to

the

to

the operator. For

of

of

so

set so that "115" shows.

that

voltage

is

located inside

the

cover and also

top

inside

of

of

slow-blow

(115

V operation) or 1/32 A

The voltage

THE

POSSIBILITY o|= A SAFETY HAZ-

INJURY

FUSE.

on

at

where it

shield

the

Line Voltage

the

plugging

rating should

of

115 V operation and

of

230

V operation. Only a

Sheuld be

thee

wA|=tNiN(;i supply

WARNING!

OR

DEATH, DISCONNECT

BECAUSE OF THE

FUSE

SHOULD

BY

A

BY

the

the rear

can

it

can

QUALIFIED SERVICE

A QUALIFIED SERVICE

bottom surface

of

the instrument. With

cover simply slides ie9eTded

the

freed from

be

be

freed from the instru-

attached

if

appropriate, changing

shield

the

in

line

the

cord

113 IN

THE LINE

on

are

are

switch research has shown

the

printed

printed on

operator.

nominally

nominally

“115”

of

of

115 V

115

shows.

nominally

nominally

the

fuse,

rear panel.

the

the rear panel.

type

be

be

USed-

BE

CHECKED

to the

first

it is

rated

(230

125 V

125

V or

250 V or

BUSS

OR

POTEN-

ofthetop-

of

the top-

instru-

the

inside

Selector switch, he evetdeti

and

and

cover

top

operating

1

APPLICATIONS

few years,

has been

users

It

has

safety in bio-medical

a matter

and suppliers

long

been

through

known

the

in

of

of

heart

bio-medical

growing

growing concern

of

of

concern

electronics

electronics

electrical

that

can interfere these

with

normal heart

with normal heart functioning. However, recent
research has shown that danger exists at far lower

on

For a consequence

V

in- high input

the

at

V

or

IN-

of

of

1

ap-

ap-

current

current levels than was previously suspected. As
a consequence

after a careful analysis

after a careful analysis

EG&G

EG&G

feelsthat it cannot recommend the Model 113for

feels that it
use

patients. In

patients.

conditions

conditions
failure, or excessive common-mode input, the
high input impedance

and

and potentially dangerous currents could flow

through the

through the subject.

However,

However, the reader should not get the impres­sion that the Model 113 is in any way a dangerous

instrument

instrument
characteristics that necessitate the adviSOry

against

against the instrument's use in bio-medical

plications with

plications with humans are common

preamplifiers as

preamplifiers as well.
supply voltages, capability for internal battery
power with complete independence

power with

and extremely high input impedance under normal
operating conditions, the Model 113 is probably
one
general use. For all practical purposes,
considered
mum internal supply voltages applied

mum

plifiers are only

can

can only appear at the input under very specific
operating conditions, and then generally for only a

few

few milliseconds. A person inadvertently touching

the

the input under these conditions would, in
general, not even be aware that there was any
voltage there at all and by no stretch

Vettege

agination could the operator

regarded

The preamplifier can be used in biological appli-

cations

cations involving animal subjects. However,

application is one in which skin resistance is

eppiieeiipn

a

greatly reduced

dreetivredueed prbvpeeeed.tne

ed

unnecessary risk to the experimental animal is
be avoided.

(1) Turn

(1)

(2)

(2) set

(3) Do

(3)

It

It may prove helpful

these precautions. By understanding them, the

levels

Princeton

Princeton Applied Research Corporation

cannot recommend the Model 113 for

in applications

in

applications involving human subjects or

certain situations

In

certain situations involving specific

of

of

excessive

or

impedance of the

potentially

subject.

the

that

the

to

to

instrument’s use

the

voltages,

epinpieie independence of

extremely

conditions,

of the

of

the safest preamplifiers available for

to

to

internei

are

only

appear at

only

conditions,

milliseconds.

input

under

not even

there at

could

as

being

ee hethg

preamplifier

involving animal subjects.

ie pne in whieh ekin reeieienee is

to

to

observe the following recommendations

observe the

the

Turn the amplifier power on BEFORE making

connections

any connections
Set the Input Coupling switches

the

thput

113

the experimental animal.

the
the

the GND settings until after the connections

are

are

Do

the

the instrument is connected

mental

mental animal.

may

GND

to

GND before making any connections

to

experimental animal.

GND

completed.

completed.

not

turn

not turn the power switch on

instrument is connected

animal.

prove

precautions.

functioning.

dangerexists

that

was previously

than

of this

of

increased

this

increased awareness, and

of

of

Applied

involving human

grounding,

grounding, internal component

However,

at

recent

far

lower

suspected. As

awareness,

the Model 113 design,

the Model 113 deSign,

Research

Corporation

and

subjects

involving

specific

internal component

common-mode input,

of

Model

the Model

dangerous currents

reader

Model

use in ordinary applications.

use in ordinary applications. Those

should not

113

is

in

any wayadangerous

that necessitate

are

humans

well. In

capability

high input impedance under

safest

For

all practical

be

completely harmless.

be

completely harmless. The maxi-

Supply

12 V. Even

i

±

12

the

A person

these

be aware

ett ehd hY he etfeteh Qt the im-

the

operator

in

ih

can

or

bypassed, the operator is advis-

following

to

the

amplifier

Ceuhtthg ewttehee 01 the Medet

before

settings

power

the

helpful to consider the reason for

By understanding

common

fact,

In

with

fact, with

for

Model

the

preamplifiers

vpitepee

V.

Even

input

and

then

inadvertently

conditions

that there

of

of

any danger.

ehY dehgeh

be used in

recommendations if

experimental animal

power

to

to

on

experimental animal.

the

the experimental animal.

making

Do

Do

after

until

switch

to

consider the reason for

113

could fail

113

could fail

flow

impres-

get

could

the

Those

advisory

the

in

bio-medical

most

to

to

its

low

its

low internal

other

most other

internal

internal battery

of

the ac line,

the ep

113

is

line.

normal

probably

available

purposes,

eppiied tp the em-

these low voltages

these

under

can be

it

it

can be

The

maxi-

to

the am-

voltages

low

very specific

generallyforonlya

touching

would,

was

any

of

the im-

instrument

the

the instrument be

biological appli-

However,

pperetprie

if

if

advis-

isto

BEFORE

any

connections to

not

not transfer from

the

on

to the

to

making

of

the Model

transfer

from

connections

while

off

or

or

off

while

experi-

the experi-

them,

or

the

ap-

ap-

for

in

be

the

the

to

to

the

3

if

1

i

operator may be better able

electrical

only

but where

(1)

monitoring

where the input

other

of experimental animals, not

amplifier

preamplifiers are used as well.
Turn-On Transients
When the

cuits

amplifier

do not instantly assume

operating state. Instead, a

to

safely carry out

is the Model

is first turned on, all cir-

their

quiescent

finite

time
quired for the common-mode loop amplifier
to

ing point. During

'|euu0s1ed

A12-112s

from a few

s11

set the input stages

001/ues pe111|enb

|11un

milliseconds

eq10u

pasn

to

their proper operat-

this

interval (which varies

pe1111a/\

Aq

to

p|n0L1s

a second

sn1e1edde

ueeq seq

depending on the source impedance), the
source-gate
or

uvdsuen we/\es O1

the

the

transistor

pedance, but instead appears as a low im-

pedance from the input

e6e101s

‘s1ueu1e1nseeu1

pe6u0|01d

the

output

(2)

Power Transformer

junction

other

is forward-biased.

‘su0111pu00

01 pe10e[qns

of

the common-mode amplifier.

pepue1u1

of

one input transistor

D9109[q"$

does not

exhibit

a|qe10/\e1un

of

the instrument

0111

111101100

‘eewep e|q1s1/\

'sesse11s

In

ueaq $91-| (v)

this

a high im-

1epun 1210/\es 012

uaeq

se|_| (9) 1eu11e

01

s|1e:|

s/v\0q3

The power transformer in the Model
very high quality and is unlikely to fail during

life

of

-u1exe101‘11pe11ed1111eq

e/\11e1ed0u1

-u11 uaaq

the

'u0!1B19d0 pepua1u1un

possibility
must
and

if

seu

complete

pep;/101d

u0110e101d

the instrument. Nevertheless, the
of

spew aq ||eus sn1e1edde

be considered. Should a short develop,

the

instrument were being used

pun016

or

mon in many

-“IWHONHV GNV

dangerous situation would exist.

(3)

Internal Component Failure

01/(|e>11|s1u0110e101d eul

Aue

such a failure, however remote,

1111120 01

improper ground returns (com-

eul

1€u1

buildings

The input transistors
junction-type

e1n1e1ed111e11ue1qu1e 011112111

eq

though they

0111

/§|u0

5U!1Ul'1OLU

eq

Aue

-1eq

“GUM 9119'“

‘(A1010121

resistance when properly biased,

>10e1)

tance can drop

ueo

ing current or bias is

a/ueu

ing range

ueu/v\ sse|

biased diode

the source or the drain. There are several

's1ue111e11nbe1

1|

10u

9 MUD 4° u°!1dw"Su°°

‘£3,912

field-effect

exhibit

111011

0111

>10e1

e

to

911

seop

sufficiently

ue/10

pue

junction

u!

|ep0|/\| 0111 ‘pe1e1ad0

‘eu||

possible internal component failures which,
though unlikely, could bring about
tion. Should

fier

would be connected through a low im-

pedance

s1su0g1e01|dde1eu10||eu1esn

L111/v\ esn

u011e10d109

L|5HOL|1

supply.

101

ue/\e

911

‘1eu1pez1seL1d1ua

it

occur, the input

directly

-u011e/\1ese1

|ep0|/11

qomeseg

to

0111

peuddv

:sn1e1edde

1su1e6e

pemoes

0111

u0110euu00

s1 11 10/\eueu/1/1

A|e>11|

and installations), a

33333313

$133530 -H

of

the Model

01O<,9L

an

paseuomd

10

a few

out

to

-

the

1n0u11/v\

pue1u11100e1

4°

95°91

transistors.

6u1eq

extremely high input

uoueq e

ohms

u011e|11ue/1

of

give a simple forward

0e

e111

from the gate

eq

u0 pe1e1ad0

if

their

the normal operat-

u1011

J9M°d 9 WM

N0|-|-V'||1-N3/\

of

instrument's

pepua1u1u00e1

s11‘s10e[qns

u01e0u11d 91993

eq p|n0us

0111

1u1e11su00 JO Q EH Iapow

ueo

their

pe1e1ed0

this

the ampli-

10u

11

'a0ueped -110

-11111ndugau11a/v\0|Aqe1eu1pue‘s11n01101ndu1

ehll

1001010

'su11

u0110npu00

/\ 1 s1 911

squad

-UOLULUOO

01 10111101112010 eL|1101ndu1

/v\0|

|ep0|/\|

‘su011e01110eds

0111

1ndu|

“uo u1n1,,

0141101111111

epow-u0111u10Q

s10/\e|

eu1

011112

10116114

1ndu1

pelels

ug

0/\1sse0x3

epow

(4)

Excessive Common-Mode Input

113,

As stated in the specifications, the common-

mode input
Higher levels
at the input
input circuits, and thereby lower the
pedance.

is

re-

Again, it should be emphasized that, even though

EG&G Princeton Applied Research Corporation

does

not recommend the Model

human subjects,

or

more

uong 10/v\0d s,1ueu1n11su1

state,

to

(3)

(1)

113

is

of

‘e|d -|v 's101s1sue11

recommended

-LU! /v\0| e u6n01u1

1ndu1

10

-g|dwe

-!r>u<>vs!u11r\<>qv

‘uogu/v\ se1n|1e1

p1e/v\101a|du11s

-1e1ed0

-1e1ed0

-s1se1 110111

1ndug 115111

012 911

eu1

G. VENTILATION

With a power consumption
operated from the ac line, and even less when bat­tery operated, the Model 113 does not have any
special
operated on a bench or
kits can
constraint being that the ambient temperature

in the range of 15°C to

010111

010126

|e1u10u 011110

ventilation

11eu111

‘pese1q

be

purchased from the factory), the only

A|au1e11xe

|ep0W

pue

‘pe11ed

with

in-

0111 Aq

113

W1“!

s1!>1

resis-

operat-

|e10eds

A101

to

either

'9

condi-

1

power

uewnu

seop

‘ugev

sv

(11)

are

Al-

H.

DEFECTS AND ABNORMAL

STRESSES

‘(su011e||e1su1

12

-11100)

Whenever it is likely that the protection provided

-ug L|1!M

by the connection

‘d0|c-map

paired, the apparatus shall be made inoperative

‘e10111a1

and secured against any unintended operation.

0111 ‘sse|eu11e/\eN

The protection is likely

fiuunp

ple, the apparatus:

'

(1)
(2)

'1s1xe

su1n1a1

Bugeq

pesn

110us e p|n0L13

10/\a/v\0u

112101/(|e>11|un

Shows visible damage,

Fails

to

ualmdwe apouwowwoo

O - '

(3)

Has been subjected

11ueu1n11sug

-LUI

101s1sue11 1ndug auo

0111

-121:-ado 1ad01d 110111

1e111|du1e d00|

under unfavorable conditions,

(4)

‘a1e1s

/v\0|

116111

se sfmleeiide

e

e 11q1uxe

Has been subjected

u|

S!Lll

stresses.

‘(eouepadwg e01n0s

Such apparatus should not be used until

e10u1

has been verified by qualified service personnel.

sa->112/1

-e1

1ue0se1nb

"||a/v\

‘QLL

10u

1n0 A1120 A|a1es 01 e|qe

puooas

10

uogum)

s1 011111

‘u0

112

se pesn

|ap0|/1|

‘s|eu11ue

e11u11

11:->u1eu1nsse A|1ue1su1

peu1n1

01.11

|e1ue11111edxe10

limit

of

the Model 113 is 1 V rms.

"turn

on"

low

conduction

of

the preamplifier to protect the

113

for use

its

use in all other

01 A|10e11p

au1

without

Buuq

reservation.

pe10auu00

eu1 ‘1n000

PIHOO ‘K|<->>1!|l1r\

eq

11 p|n0u3

1ueu0dw00 |eu1e1u1

-u1e1p

eu1u101;

e e/116

swuo

A|1ad01d

100110-p|e11

10

9L|1

a1n|1e5

p|n0/v\

pue

u0110un[ ep01p

A|1ue10111ns a6ue1

01

1n0 s1

requirements. It can be

M012

ue

s101s1sue11

s6ugp|1nq

10

eu1

of

segq

d01p

01

in

a rack (rack

ueu/v\ a0ue1s1sa1

11q1uxa

ed/(1-u0110un[

45

°C.

1uau0dw0Q

u011en11s

pun016 1ed01du11

e1a/v\1ua11|n11su1

to

earth ground has been im-

'pa1ep1su00

‘e1n|1e1e

'1ue1un11su1

eu1u|JewJ0JSueJU9M0d

perform the intended measurements,

e

01n

1

-pesegq-p1e/v\101

01

e

|e/\1a1u1

01sa5e1s

apomu-u0111u100

e ‘pee1su|

1s111

012 s1e111|du1ee1d

s1 1e111|du1e 1ndu1

u0ns

0111

to

be impaired if, for exam-

pue

s1

'

Mllenb 116111

1eu1101sue1_L

em ;0 mdmo em

d

to

ug 0

111101

pee1sL1|1|

10u

sa0p'101s1sue11

to

s1 101110

10 u0110un[

u0

0111

spu00es1||1u1

6u11nq

S!l41

1ndu1 0'41

01.11101

'e1e1s 6u11e1ed0

1e111|dLue

sq

S1UG!SUBJ]_ UQ-Ulni (1)

5ug1011u0u1 |e01110a|a

1a11aq

"A|ddns

applications

asueped

p|n0/v\

u5r\<>u1

e|q1ss0d

e01n0s

only 5 watts when

pasegq

101ue11n0

ueo

e0ue1

A0111 u6n0u1

1ndu1

|eu1a1u|

sn01e6uep

Auew

u1

10 e1e|d11100

011111

eq 1snu1

A11|1q1ss0d

10

10 0111 0111

1e/v\0d

prolonged storage

eoue

1nqJ‘c-Jouegad

severe transport

au1 10

0126-e01n0s

ugpuedap

M8}

e 111011

'1u10d 6u1

les

pe11nb

10u op

eu1

1eu10

eu1

01011/v\

aq A2111

paths

input

1011

-u011

0111

6ug
6u1

mounting

aui

(9)

u0u1

pue

A10/1

Gui

(3)

d

0

0111

its

safety

01

s11n0

ueu/1/1

a1eu/v\

A|u0

101e1ed0

im-

with

be

1nq

is

’

1

W

L'\

SECTION

CHARACTERISTICS

1.1

INTRODUCTION

The Model 113 Low-Noise Preamplifier provides high gain,
low

noise

amplification
kHz. Adjustable high and
bandwidth

to

be
coupling switches,
operation. Calibrated gain
X104

in a 1·2-5 sequence, and

provides

The

unit

x1

to

x2.5 range expansion.

may

be

powered either
own batteries. The nickel-cadmium batteries recharge
automatically

during line operation.

Other features include
special

circuitry
currents, front-panel
tion

screwdriver controls,

The Model 113
other Princeton

is
Applied

ments.

1.2 SPECIFICATIONS

(1) INPUTS

=(>|

009$

unwul ooz

01

Two

channels,
provide
tial operation. I

for

1(00l

of

wideband signals

low

frequency
reduced.
allow

Two

either

differential

is

switch selectable

an

from

an

overload fast-recovery switch,

that

reduces the effects

dc

zeroing and common mode rejec-

and

battery

well suited

for

Research signal processing instru-

40 ww) apvw

each

with

a three position switch

ac

or

dc coupled, single-ended

nput

SW95)

connectors

A

.SwJ

O1 OLJO

from

dc

to

300

rolloffs

inputs,

allow the

with

individual

or

single-ended

from

x10

to

uncalibrated gain vernier

the

ac

line

or

from

its

of

ground-loop

test provisions.

use

as

QPOW

are

BNC

L Iepow

a preamplifier

'/\LU

l9!1U919H!Cl

.Aw

or

I9!1U919H!C|

type

uowwoc)

09$

differen­.

for

(O)

to

(Q)

(E)

I

(2)

INPUT

(a)

(b) Dc coupled: 1 gigohm, shunted

(3)

MAXIMUM

(a)

l

(4)

-ua1aH!p

01

-H.l1SU[5U!SS800.Id

J0;

IMPEDANCE

Ac

coupled: through

with

100 megohms and 15 pF in parallel.

INPUT

WITHOUT

Dc coupled: Common-Mode,

(b)

tial, ±7.5

Ac
200

V.

coupled: coupling capacitors can

V. Transients
capacitors cannot exceed dc coupled operation
limits.

MAXIMUM

LINEAR

(a)

Common

Differential

(b)

mY.

L|O1!/V\S

(c)

Differential
±50

J9[}!|dLU€G.lC|

INPUT

OPERATION

mode: 1 V rms.

QN9

"ad/\1

pepua-a|6ugs

JO

UO[l[SOd

mY.

smlaauuoo

am

mode (gains

aanp,

mode (gains

|eu6!s

asn

se

2

0.1

which

SIGNAL

(see

Subsection 3.10)

‘pa|dn0o

qlg/v\

e

SNO|_W3H|33dS

qzueasag

palms

Jo;

J.1F,

shunted

by

15

DAMAGE

±10

V;

pass

through coupling

CONSISTENT

'uo!1e1ed0

1ndu|

of

10

to

10;

oe

10

op

’s|auueqo

qoee

of

200

through 10

paqddv

sg gll

||a/v\

to

ground

pF.

Differen-

withstand

WITH

|eg1

100):

±500

8p!/\O.lC|

0/v\_|_

S_LdNl

uolaauud

|apo|/\|

k):

(L)

Z1

'S1Ll9LLl

J9L|1O

aq_|_

J

*

w

~

LNELLSISNOD

H_LlN\

UO!19.l9dO

/

6ug|dno:>

pue1sq1g/v\

-umeggq

pun01

(UL-8

pa|dnoo

q

5no1

ueo

5/\

El'E)\7’V\|V(]

Wauejed

palunqs

01

ugugggqns

"lVND|S

paaoxa

op

ssed

q

agq/v\

[41

smlpedeo

'apoW-uowwog

Q[_:|:

.LOH_LlN\_LdN|

pa1unqSluJqO5!5L

dd gt

U!

1'9

‘511

NO|_LVH3dO

995)

.LdNI

louueo

s1uagsue1_|_

6u!|dn0a

:pa|dn0:>

'/\

:pa|dno:>

zpaldnoa

Swqoaw

pug

q6noJq1 :pa|dnoo

EIf)NV(]3dV\l|

HVBNH

INHINIXVI/\l

'$1!W!l

s101goede:>

QQZ

'/\

av

9'L¥'|9!1

sq

INHINIXVW

(17)

(q)

(9)

(8)

90

Lm,“

Om

(e)

av

_LdNl

(Z)

SQILSIHHLQVHVHO

NOLLOHS

I

\-1

'suogsg/\oJd

apow

-i)9[9J

dOO|-pUI'\O.l5

‘qolg/v\s

a61eq:>e1

s13

.l8[UJ9A

01 QLX

papue-e|5ugs

|Bl"|p[/\!pU[

aql

QQ8

‘uge

Ma/\o0aJ-1se;

saualleq

10

LUOJ}

uge

11.101;

/v\0||e

01 op u.|o1;s|eu6gs

qgq

1sa1

uowwoo

s1oaHa

;0

oe

au!|

pe1e1qg|eoun

e|qe1oa|as

|B[1U9J9H.[p

JO

'S1dU[

s;;0||o1

sap!/\01d

Malleq

Bugmaz

pue

seonpeu

aql

peope/\0

'UO|1€J8dO

.

wngwpeo-|a>|9gu

.l8q1[9

LUOJ}

eql

'u0gsuedxa

pue

ue

qslg/v\s

Jaqlga

ON\_]_

Aouanbaq

pueqep!/v\

1ag,u|dweeJd

pue

ue

’a0uenbes

sg uge

'pa0npc->1

/v\o|

40

as!o|\|-/v\o"|

's|011u00

0p

apn|oug

au||

pe1e/vxod

95UBJ

/v\0||e

pue

J9A[.lpN\9JI)S

|aued-1u01;

Angnrugra

12141

Buunp

.

.

aq_|_

aq

ggx

p91EJC|[|BQ

'saqo1g/v\s

eq

e|qe1sn[pv

qgq

uogleogmdwe

NO|J.I)ClOHJ.N|

'S1U€-LLIHO

|eg0eds

samlea;

A||eo|1eLu01ne

.

'sag1e11eq

lgun

Aew

S9p[AO.|d

Lx

01

ug

e

9-Z-L

'uog1e1ed0

5ug|dnoo

L|1p[/V\pUBq

O1

asgou

|epo|/\|

gll

uo!1

Jaqlg

u/v\0

eq_|_

tglx

'z|_|>|

/v\0|

eq_|_

L‘

L

(5) COMMON

(5) COMMON MODE REJECTION

MODE

REJECTION

(11)

(11)

OUTPUT

OUTPUT

VOLTAGE

VOLTAGE

FREQUENCY

FREQUENCY

dc

dc

100

100

(6) GA|N

(6)

(7)

(7)

(B)

(8)

Hz

100

to

to

100 Hz

1 kHz

1 kHz

kHz 80 dB

10

kHz

10

kHz 60

kHz

GAIN

x10

to

x10

to

calibrated

calibrated gains

calibrate position.

calibrate position. Gain vernier provides uncalibrated

gain range expansion

gain F8099 eXl3>an$i0n

FREQUENCY

FREQUENCY RESPONSE

Rolloff frequencies

Rolloff

switch markings

switch markings indicate

rolloff curve.

roll

off

(a)

Low

(8) I-OW FFBQUBHCVI

kHz

kHz

(b) High Frequency:

(b) High Frequency: 3 Hz

sequence.

sequence.

NOISE

NOISE

FOR

GAIN

>

FOR

GAIN>

120

dB

120 dB (min)

100

100

BOdB
60

x104

calibrated gain settings. Accuracy of

X104

calibrated gain settings. Accuracy

gains

is i2% when gain

is

Gain

RESPONSE

frequencies

indicate 3

Rolloffs

curve.

Rolloffs

Frequency:

positions

positions in 1-3-10 sequence.

in

200 FOR GAIN < 200

200

(min)

dB

dB

dB 40 dB

dB

±2% when gain vernier

vernier

of

up

to

x2.5

01 LID ‘£0

are switch

are

are selectable as

are

1-3-10 sequence.

X2-5(fT\ilmUm)-

switch selectable.

dB point of 6 dB/octave

~

dB

selectable

dc

position

d¢ P050100

3 Hz to

FOR

GAIN

100 dB

100 dB (min)

80

BO

60 dB

60 dB
40 dB

vernier

provides

selectable.

point

300

to

300

uncalibrated

(minimum).

Front

of

6 dB/octave

follows:

as

follows:

and

0.03 Hz

and 0-03 HZ ‘E0 I recharge automatically

kHz

kHz in 1-3-10

volts

< 200

(min)

dB

dB

of

is in the (14)

is

in the

Front

panel each of the -[W0 in-[ema|

panel

to

in

1-3-10

10

10 volts pk-pk

(12)

OUTPUT

OUTPUT

(12)

600

600 ohms.

(13)

OVERLOAD

(13)

OVERLOAD

Resets

Resets

toggle.

toggle.
data.

data-

P()\/\/ER REQU|RE|\/|E|\|TS

(14) POWER

(a) Rechargeable

(a)

(b) AC |ine

(b)

(15)

DIMENSIONS

(15) DIMENSIONS

8.6" W

B.6"

cm).

cm).

pk-pk ahead of 600 ohms.

IMPEDANCE

IMPEDANCE

ohms.

immediately

immediately

Figure

See

See

Figure

REQUIREMENTS

Rechargeable nickel-cadmium batteries provide

approximately

approximately 30 hours operation between

charges.

charges. A front-panel, three-position, spring-

loaded

toggle

loaded toggle switch
each

of

the

Ac

ac, 50-60

ac,
recharge automatically

ac power line_

ac

W x

Operation; 195-125 \/ ac

line operation: 105-125 V

50-60 Hz, 5 watts. I nternal batteries

power line.

x 4.1" H x11.3"

4.1"

ahead

of

600 ohms.

RECOVERY

RECOVERY

with spring-loaded

with

spring-loaded front-panel

Ill-2 for characteristic recovery

111-2

for

characteristic recovery

nickel-cadmium batteries provide

hours

30

front-panel,

A

switch and test lamp

and

two

internal batteries.

Hz, 5

H x

watts. Internal

D (21.8 cm

11.3"

D (21.B cm x 10.4 cm x 2B.7

operation bet\/veen

three-position, spring-

test lamp

bat-(erie5_

permit

permit

or 210-259 \/

ac

or

batteries

while unit

while

is connected

unit

is

x

10.4

connected

front-panel

test

test

210-250 V

will

will

to

cm x 28.7

of

of

to

At

At

10 Hz

figure

figure

source impedance,

source impedance, noise figure

See Section

See

contours.

contours.

(9) DC DRIFT

(9) DC

(a) Referred

(a)

(b) Referred

(bl Referred

DISTORTION

(10)

DISTORTION

(10)

Typicaldistortion

Typical

with

Hz

10

is

0.3

is

0_3

Section

DRIFT

Referred

"IlV/C

‘I-IV/QC Or

ambient

ambient temperature. A
control

control provides

than 1

than 1 mv/24

perature.

peratum

distortion

a 2 megohm source impedance, noise

with

a 2 megohm source impedance, noise

maximum. At 1 kHz

dB

dB maximum_

noise figure

Ill for

further

III

for

further

to input (dc coupling):

to

input

or

less

than

I688 than

temperature. A

provides

to

output:

to Output: less than 1 mv/CC’

mV/24

less

is

is

less

At

discussion

discussion and noise figure

(dc coupling):

/1V/24

10

IlV/24

10

for

dc

zeroing.

for dc Zeroing.

less

hours at constant ambient tem-

hours at Constant ambmnt

than 0.01%.

than 0.01%.

with

1 kHz

with

is

0.2 dB

is

0.2 dB maximum_

hours at constant

hours at constant

front

panel screwdriver AM-1 has a 3 dB

front

panel screwdriver

than 1

a 1

a 1 megohm

maximum.

noise figure

and

maximum

maximum

mV/C,

megohm

10

or

less

or less

tern‘ three dB

10

(16) WEIGHT

(16)

WEIGHT

4 pounds

4 pounds (1.B kg).

(17) ACCESSORIES

(17) ACCESSORIES

If

the

If

the source impedance

low-noise

low-noise performance

AM-1,

AM-1, AM-2,

AM-1

the

the AM-1 and the AM-2

AM-1

has

at 10 ohms

at 10 ohms source impedance,

bandwidth of

bandwidth
source. The Model 190

source.

three dB bandwidth

1 ohm source. See Section

1 ohm source.

regarding

regarding these transformers.

Flanges

Flanges

two units side by

two

units side by side in a

Subsection III-12 for

Subsection

flanges.

flanges.

kg).

(1.8

source

impedance

performance will be

AM-2,

or 190 input transformer

or

190

and the

a 3 dB bandwidth

of

The

AM-2 have

bandwidth Qf fr()m 1 kHz

source

from

from

Model

190 has a

bandwidth is

See

these transformers.

are available

are

available

111-12

for

is less than 100 ohms, best

is

less

than 100 ohms, best

will

input

have

impedance,

1 kHz to

1 kHz

has

from

is

from

Section

for mounting on a single

for

mounting

side in a

the part numbers

the part numbers

obtained

be

obtained

transformer

1:100

1: 100 turns ratios. The

of

from

and

and the

150

to

150

1:10:100 turns

a 1: 1 0: 1

Hz to

0.25

0.25 Hz

for further details

lll

III

for

19" relay rack.

19"

if a

if

is

is

turns

1 kHz

AM-2 has

the AM-2

kHz with

kHz

with

00

turns ratio. The

500

to

500

further

on a single

relay rack.

Model

a Model

used. Both

used. Both

ratios. The

to 10 kHz

to

10 kHz

has

ohm

a 1

a 1 ohm

ratio. The

Hz with a

Hz

with

details

unit or

unit

or

See

See

of

these

of

these

a

a

a

I-2

1-2

J

L'll

2.1

INTRODUCTION

The

following
performance
procedure
ment

for shipping damage (any
carrier and
but

before using
encountered
factory

or

procedure

checking

of

is

the

should be performed

to

Princeton Applied Research

it

experimentally. Should

in carrying

one

of

its representatives.

out

2.2 EQUIPMENT NEEDED

(1) General

(2) Signal

sL1! 1eq1

sinewave

-19d

luawmlsug

2.3 PROCEDURE

'uog1gs0d

(1) Make sure

indicating

u101;

A|qe1ap!su0:>

Vac).

8L{1

'.l9A8N\O|-| '/\LLl

p|n0qs

(2) Plug

into

'>|d->|d

101Lu0|/\|

(3) Press

(4) Push

sawp,

aql

then

JO1!u0W_>|d_>|d

light for

(5) Make

eq

/\ L

(a) Gain:

sumas 1ndu|

apn1!|du1e

asn)

3l.|l

'>|d->|d

pue

'>|oe[

purpose

generator

ems A|qeu0sea1

at

(1no) :|:]Q

1nd1n0

the

line

the

power receptacle.

/\ L aq p|n0qs

'>|d->|d /\ L ‘z|_|>| L 01 JO1BJ8U95

the

the

ua1 aq p|n0qs

push

both

the

p|noqs

until

uaa/v\1aq

.|01e1aua6

'>|oe[

A

3N9

1nd1n0 aql

L

'ZH>|

'z|-L L

laboratory oscilloscope.

capable

1 Hz,

aql 4|

aq ueo auo ’pa1eogpug

100

Hz, and 1 kHz.

's>|oaqo Leglgug

aql 01 L|C)1!N\S J9MOC|

the

rear-panel slide switch

the

line voltage

Me/\ uea

Q9 A||e0gdA1

9l.|1 fu011nq

cord

apn1!|dwe Leugs

Me/\00a1

into

the

La/\a| 1nd1no sq), f1nd1no

power switch so

spring-loaded

it

to

,ZH

La/\a| 1n

the

battery

right.

positions.

following initial

La/\a| 1nd1n0

x10;

the

switch

aqa,

Cal.: fully counterclockwise

"clicks").

A:>ua1s|suoo

|eu5gs aql

;)|\|g lndug

IZH

L

L

01 1o1e1aua6

01 ado0s0||!:)s0

Il0J1U09,l,l0||OH

1|OJ1UO1)HO||OH

INITIAL

provided

Model 113.

after

noted

these checks,

of

to

‘|a/\a| /v\o| e 01 aseamap

that

d

1n0

The

Jolejaua

control

51nd1no

('s6ugpea1

a>Leu1

V

/\:>uanba1:L

to

facilitate initial

In

general,

inspecting

to

be reported

the

Corporation),

any

difficulty be

contact

'A|Jad01d 5U!18J9dO

providing a 1 V pk-pk

aqn, sa1a|dwoo

be used

eql

is

'1!un

(115

in

a1n|0sqe

se pauuo;

umlag (ZL)

the

01 1Lun

V ac

"L/\() aql sseud (LL)

rear

of

the

instrument

aql

Leugs aql 1a3 (QL)

it remains depressed.

test

toggle

to

lndu!

-lam‘

f d

1n0 9141

1n

aql

green indicator should

‘Bums

settings:

'>|d->|d

101guo|/\|

aql

pue

loauuoo

19$

laauuog

q5!|_|

/v\0"|

u|e1q0

01 ad0os0||g:>s0

01

8L|1

|eu6gs aql

aql

Aou:-)nba1;L

1nd1n0

01 ‘s6u|11as

1!

SECTION

the

instru-

to

the

the

s!|.|_|_

position

or

220

and

the

left,

(6)

(3)

(turn

(L)

(9)

(p)

(0)

II

CHECKS

(b) Coupling: A

the

Frequency

Frequency

the

signal

it

(c) Low

(d) High

Connect

(6)

Set

(7)

connect
oscilloscope
settings,
and

as;/v\>|00|01e1un0:> A||n; :'|eQ !QLx zugeg (2)

uml)

(8) Monitor

pk-pk.

(9)

Set

p|n0qs JO1BO[pU! uaa16 aqi '1q5[J aql 01 1; qsnd uaql

the

9L|1 01 a|6601

‘1;a|

input

'p8SS9Jd8p

(10)

Set
the

pue 1uaLum1suL

(11) Press

decrease
absolute signal

JO

QZZ

oe /\ 9L L) pasn aq 01 a5e1|0/\

unit

uoglgso sq), ug sq

(12) Return

to

output

the

:s6ug11as

the

signal

output;

level.

sugeweu 1g1eq1 os qf)1!N\S J8IV\Od aql ssc-ud (3)

the

signal

output;

aq),

the

to

to

unit.

the

This completes
formed

>|d->|d

operating properly.

as

/\ L e

indicated,

Bugpg/\01d

edoasomaw

aql 1oe1u0:) ‘s>|oaqo asaql 1n0 Bug/X11129 ug pa1a1uno:>ua

aq /\1|n:>g;Lgp Aue p|OL|S

'(U0!1B.lOd.lOQ

01 panodaj aq 01 palou Aue) aewep Bugddgqs 10; luau;

aq1

amp,

-nnsug

’|e1aua6

aqn,

l9!1!U! 9191!|!99}

qomasag pauddv uolaoupd 01 pue J9!.lJBI)

ugmadsug Jaye pauuopad

u| 'gLL |ap0|/\|

input

AC, B

input

GND.

Rolloff

Rolloff

oscilloscope

generator

to

the A input

to

make

obtain

consistency

the

control:

control:

to

the

to

1 Hz, 1 V pk-pk, and

output

1 Hz.

1 kHz.

BNC jack_

BNC jack. (Use

signal

generator

between

input

amplitude

readings.)

f(,,s>|og|o,,

output;

|OJ1UOO Leglgug 6uL/v\0||0,1 aL|1 e>|e|/\L

generator

the

output

1sa1 Malleq

generator

the

output

L0 1291

OVL

recovery

a low level, typically

amplitude

LL01!/v\s

ap!|s Laue -ma; 8L|1 ems

power

switch

the

initial checks. If

pue ‘z|_|

L

'z|-|>|

one

L0

CHCHQN

LL01!/v\s aql

the

output

'suog1gs0d

to

100

level should be

pepe0|-Bupds

to

1 kHz, 1 V pk-pk.

level should be 7 V pk-pk.

'G|OQld9I)9J

01u! p100 aug| sq], 6n|d (3)

sq),

button;

can vary considerably

au|| sq), 6u|1L2(:>O|iJ:1\|

to

the

ElH(]3OOHd 8'2

QQL ’z|_|

can be reasonably sure

a|qedeo JOlB.l9U95 |eu6!3

Molejoqm

|!1un

level should be 7 V

10;1q5;|

qloq

Hz, 1 V pk-pk.

ten

9141 qsnd

J9N\Od

aql o1uL

the

output

50

mV. However,

.

OFF

.

a>|e|/\|

(out) position.

the

instrument

L12 a/\e/vxaugs

asodmd ‘mama

-|-N3Wd|nO3

times

. .

wmleluasajdal

'/\||Q1U£-)LU!.l9dX9

aql Lo 5U!>|38L|3

01 P9P!'\0Jd 5! 9mP99°1d 5“!/\/\°||°} 9LLL

15 Bugsn a1o;aq 1nq

aq p|noqs

ampaoojd

a0ueuu0,uad

the

settings

(g)

Monitor

the

(17)

Monitor

should

the

from

(L)

per-

that

it

(Z)

(L)

Z2

is

'c1|\|91ndu!

s‘:)v1ndu!v =5u!|dn<>:> (q)

S)lO3H3

NOLLOHS

ll

'lVl.l.lNI

11-1

NOLLOHCJOHLNI

L'Z

7-"

S!

Avuanbwq

95!°U

optimum

pasn

uq

the

bandwidth,

which

Q3/:||\|

the

self-contained

a5e1|o/\

to

the

a resistance

sqqq_|_

ueo

1ua|e/\qnba

operating

Aq

uaq/q/q

the

:e|nu.u0qaq1

Jaqlo

“em

‘DP

aw’

3.1 INTRODUCTION

paqqdnqnw

Aq

"z/M

Ll1P!/“PUQQ

4°

9H1

To

obtain

uqleqado

paqdnoo

aql

Op

must

be exercised in selecting

in

selecting

6uququ.ua1ap

tions,

all

of

Fundamentally,
either
and

sun

the

s1|0/\

from

=

signal

connector(s);

jack

through

pauqelqo

asqou

aq

su.u

1ndu|

NOTE: Before
rear-panel switch

voltage

installed

to

SUn0.|.N00

operation).

the line fuse and possibly

qO|

;OP§

'

and

circuit

’

F

3.2 NOISE

s~

L

7

Best amplifier

=°'p

under

those

signal-to-noise ratio. In

$0,?

generated
factor

in

respect, amplifier noise

,o|/

amount
thermal

90!

"Noise

901

(1) Noise Figure =

10»

‘°‘

oqol

s

20

avov

Figure":

I

0910

where

K =

em

T

=

M =

R =

of

9“13G°W

be used,

aunsu

(1/16

A for

Operating

{OI

’O|

components.

~~

AND

performance

conditions

+

by

the

—+~

determining

‘F

“s

noise

the

*~

noise; expressed in decibels, this

total

rms noise voltage

gain x

the

Source

= E,

rms

Boltzmann's

avo

absolute

equivalent

source

temperature

M.

P9

resistance
the

coupling

asqou

aqnqq

pa11o|d

'aoue1sqsa1

The

total

‘amqq

qoqq/v\

input
figure,

ground,
be

pue

aamos

output

noise

expressed

and regard this

1as

qo

zero).

'/kqqeluauqqqadxa

pue

noise may be

oqlsqqalaeqeqo

asqou

by

dividing

in

L;

Zq+

“ii

Z24

OPERATING

L|lp!MpUBq

sq

ua/\q5

umas

muanbau

qqvqqw

1U9l9'\!"b9

'q1pq/v\pueq

performance

9H1

the

qlpq/vqpueq

and

are discussed

instrument

5O||1UB

asqou

be ampl ified

amplified signal

:(g)

‘ls:-ueluq

|e1o1

is

in

and

EISION

115 V operation
from

~=P_<v>fmH

SOURCE RESISTANCE

‘W

where

8""

W

signal source resistance

8P9

the

BPQ

performance

amplifier

BPS

9990

source

Thermal

and

constant,

noise

resistance

for

Model

selector

qeoqd/K1

below.

asqou

x

batteries

susu

lnduq

uoqlenba

of

600

ohms.

qo

aqa,

from

ac line

the

position

3H1

be sure

'|V0ld)\.l.

too

high a line voltage will

damage

OI

OOI

SP0’

is

often

it

many

instances

input

adds

saw

thermal

BM

1

89?

"’—1"'

*

I

SP9

‘

¢

1.38 x 10-

QPQ

in kelvins

4

bandwidth

in

113;

'gqq

q-|||

sq

e

pauqelqo

Aouanbaqq

these

by

the

terms,

converted

u/v\0

becomes:

asqou

HOHOJ

/\|dw!$

eul

:IH

01

'(OCI

Jaqqqqdwe

from

the

signal

source

1ua|e/qqnba

asqou

in

ground

is

powered

|BLU.l8L|1

or

1ua|e/\qnba

is

applied

is

available

pue

A1!1uenb

‘smoluoo

power,

indicating

H0’!

the

proper

'l'Ill

or

1H NI

the

power

I

regarded

least decreases

the

signal-to-noise ratio.

can

be specified

to

the

1

i

at

the

ampl ifier

—

~

noise voltage (rms) dB

4L-

Noise =

' T

in

Hz

ohms

(differential

if used single-ended,

for

th.e

aq),

qapoq/\|

part

of

input

a1n6q:q

aqe

uoq1aun,q

qo

seq

s1q

amplifier

Z

X-=

9N3

M

SECTION

1ua|e/\qnba

4|

am

In

suw

S!

10/pue

aq1

impedance,

considera-

as

required

aomos

the

qe1o_|_

to

the

at

the

aql

woqq

uqsn

make

sure

the

A3N3O3Bi

transformer

OI

2

OI

to

be

realized

the
thermal
the

dominant

is

called

output

~

—

joules/K

input

smoluoo

10,1

resistance

'/kqqeoqqdeq

asaq_q_

saqqe/\

e se

an

equivalent

The

;I"l)

aLq_|_

ac line,

(3)

input

output

uq

230

blow

~

20*

overall

noise

In

by

voqg,

source

9 0|

90

qoq

volts

so‘

6°‘

o|O'

source

Lqoeg

noise

HQIIOJ

Model 113, care

loop

from

qdeq

aql Aqqensn

asaqa,

size line fuse

@1"5!=l

1/32 A for

I

is

amplified

V4KTRl'lf

23

unused

samqq

to

Jaqqqqdwe

gain.

(sun)

‘dune

lnduq

Hp

III

INSTRUCTIONS

aq_|_

asqou

Each ampl ifier has its

'

1ua|e/xqnba

varies as a
These figures are

graphically. Figure

'

contours

pasnun

lnduq

01

‘papua-aquqs

1:-as

aomos

sq

51l°/\

the

line

8p

is

V

aql

azunos

8L|1

sqql

lueuqwop

asqou

V, | qqeqa/\o 8L|1

this

pazqqeaq

the

I

the

I

—

*

sq

set

to
to

qeqluaqaqqqp)

>|/saqnoq

}VHJ.>H7/‘

(suu)

Jaqqqqdwe

1nd1no

paqqeo

paqqqqdwe

paqqqoads

Aq

'oq1e1

uq

|BLUJ8L|1

aq

3ONV.LS|SEl!:|

10

J8LUJO}SUBJ1

/vxoqq

A

auqq

aql

1nd1n0

1nc|uq

‘auqq

paqqnbeq

-eqapqsuoo

'aouepadwq

9199

-1

FREQUfNr

||q/v\

1°}

OEZ

Figure

auqq

asnq

eql

a>|ew

ems

In

using these

is

usually

from

the

aLq1

aql

(3)

Total

aq1

oe

source

The

equivalent

source

thermal

'8ll

and/or

the

(LF

rolloff

M113

is

If

the

equivalent

a6e1|0/\

pauaqaq

01

:sau1o:>aq

Jaqqqqdwe

'u|e5

'

'

pane/\u0o

01

ue

function

'

for

the

a'q1

pasn

ZH

z_()[

8

=

a6e1|o/\

95B1|0I\

Buqleoqpuq

asqou

sqql

sq

sq),

aq

asqou-01-qeuqs

aouelsqsaq

sq

aql

aql

saseaqoap

papqeaq

01

1

10-

J8MOd

i .N

Hz

auqq

1°

Z8/l

V

111-1.

J8dO.ld

azqs

'J9MOd

contours,

the

quantity

graph

and

aqqeqqe/xe

1e

paqqdde

01

equivalent

10

woqq

thermal

paqa/v\0d

se

punoq

dooq

aamos

noise

9H1

|9P°|N

amplifier

to

DC),

simply

saouelsuq

the

LF rolloff

noise

|eu.uaq1

asqou

aelqo/\

‘suu:->1

9L|l

own

'

aq

of

frequency

obtained

111-1

'

qolaaqas

qoq

Model

113.

qq fgqq

uq

swqo

LllP!MPUBq

U!

331

x

9$!°N

|BUJJ8L|1

'

a5e1|0/\

1e

8L|l

‘sq:-aqqoap

sppe

01

a:>ueuu0,uad

U!

'1ue1su00

|9U~'19Ll.l_

5“!"|9>|

uea

lnduq

aomos

1q

lseaq

uz->140

EIOHHOS

aewep

amp,

Lqqq

e

U°!1919d°

TYPICAL

ems

sq],

FOR

THE

uoqlqsod

oe

auqq

the

of

'SLUL|O

equation

qeuqs

sq

paqqqqdwe

sq

rms

saqqaneq

noise x antilog

luawnnsuq

sq

'/v\0|aq

pue

uq

noise

bandwidth

8L|1

qeuqs

is a function

99U9l11J°>l19d

W01}

bandwidth.

the

equivalent

HF

rolloff

frequency

bandwidth

aomos

suu

asqou

= amqqq

u|

asaql

Buqpmqqa

Aq

characteristic

Aeqw

'

asqou

' '

and

experimentally,

'(o1az aq

is a typical

uqqdnoo

aouelsqseu

10;

qapoq/qq

aouelsqsaq

luaqe/\qnba

asqou

amleladwal

s,uueLuz1q0g

PUB

991"°S

u|e6

x

aomos

su.u

asqou

= aJn6q:q

passaqdxa

uq

Jaqqqqdwe

Auew

aqaq/v\

sq

aql

asqou

Buquqwqz-nap

aql

qeuqs

'oq1e1

uq

suoqlqpuoo

aoueuuoqqad

CINV

30dB

's1uau0du10:)

00

Aqqqssod

001 woqq

NOISE

LUOJ}

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section

33

3.3 GROUNDING

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of

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signal

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CAUTION:

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3_4

3.4 SIGNAL VOLTAGE

With

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3'i0'

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DC

ZERO ADJUSTMENT

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saturate

111-2).

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XIX

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111-3

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1

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ZERQ ADJUSTMENT

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3.9

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ZERO ADJUSTMENT

both coupling

To do zero adjustment,

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output.

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TOTAL

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figure

111-3.

LP

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switches

switch
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Figure

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Figure

111-6.

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REJECTION

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3.10

3.10

MAXIMUM

WITH

WITH LINEAR OPERATION

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speaking

When

When speaking

distinction

a

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that

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B

and

and B inputs, and differential signal,

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with respect

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at

at

all

to

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inputs

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signal should appear

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should result from

Ill-4

111-4

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must

which

inputs, and

in

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the

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to

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are

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ON

INPUT SIGNAL

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TYPICAL

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made

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the Model

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each

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USING

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Research

shielded

Model 113:

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of

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(1)

Model

(1) Model

A

general-purpose

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three

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transformer

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transformer

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differential

Figure

Figure 11I-8A). When using

Model

Model

to ground,

to

ground,

recommended

recommended

connector

connector

rtne

the

(ground),

(ground),

pi"

3 and

pin 3 and

I“'8B-

111-8B.

mm

A

SIGNAL

TRANSFQRMER

TRANSFORMER

input

input

was

was discussed

that

that a transformer

with

with

it

it

transfer

transfer

Research

113:

transformers

transformers

AM-1

AM-1

ratio

ratio

transformers.

transformers.

Ill-8A).

113,

113,

Center

center

transformer

discussed

a

transformer

the

amplifier

the

amplifier it

adds

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is

best

is

best

curves

curves

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signal

the

Models

the

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render

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output

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if

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if

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in

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is

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tap

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the wire

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transformer

in

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in

Subsection

often

often

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to have

to

transformers

frequency

frequency

the AM-1

the

Subsection

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wire going

ourrur

is

own

noise

own

noise

noise

have noise figure

for

the

for

the

manufactures

transformers

manufactu

AM-1,

follows.

follows.

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NOTE:

NOTE:

from

from

using

of

the

the

113

113

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must

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to

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being used

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transformer.

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response

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the

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3.3,

3.3,

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to

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figure

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most

most

outer

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factory,

ground

ground

transformer

transformer

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unless

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1:100

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removed

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and

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total noise.

contours

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Princeton

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three

res

be used

190.

and

versatile

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connector,

is wired

'

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will

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100

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in

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for

for

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system,

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Figure

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FREQUENCY

111-15

. FREQUENCY RESPONSE

MODEL

Hz

190

TRANSFORMER

_

~-+---PIS

·)4---'c--+---

100

1000

OF

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PI

10k

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111-16.

TYPICAL

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MODEL

10

FREQUENCY

HI

FIGURE

190-113 SYSTEM

E

1

0'

CONTOURS FOR

10

'

The

outer

The Outer Shells 01‘ The input

floating

floating

to maintain the

to

maintain the common-mode rejection properties

the

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The Transffmer. d0 "0? C0"eC'I the iut-Cable

to

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PI~

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CASE

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TERNINALl

CAU-i-i0Ni Avoid passing excessive de Current with different

CAUTION: Avoid passing excessive

through

through the primary of this tranformer. More than

200 “A Wiii magnetize the eere_ Core magnetization interest

200

cause

will

will cause

one polarity

one polarity

high-level

high-level signals, and a magnetized transformer

usually

usually noisy and micropholJic, causing low level

distortion

distortion

this distortion and a procedure

this distortion and a procedure for degaussing

transformer. Do

transformer.

an

ohmmeter,‘

an

ohmmeter;

magnetize

magnetize

shells of

ground

off

off

ground (see

@ N has

® _‘ Q .

NaTES:

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TURNS

RAllO PI:

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<,,.,.2,,,,,i,E,,,,.,,,, ,,,,s,,,,,.eE,,,,,,,t,,,,,';,,,,,,,,,2,,,,,,,, ,°,,,,,,,,_ Ill-19

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SELf

INOJCTANCE

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i=ieu,ei|i_17_ MQDEL 190 SCHEMA-i-ic representative

Figure

111-17.

the primary

pA

will magnetize

transformer

the

the

transformer

of

of

signals,

noisy

as well. See

as

well. See paragraph (4) for a discussion

Do

core.

the

the

core.

the

input

BNC

connectors are

COHHBCIOFS are

(see 190

190

common-mode rejection

not

connect

•

~

BNC

schematic,

schematic, Figure

Figure Ill-17);

111-17);

properties

the

input-cable shield

Shield

9 permanently magnetize. All transformer

® $3 force, where

s.

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-

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RESPONSE

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(PI

DRIVEN

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REFERRED

MODEL

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PI-3.08_H

190 SCHEMATIC

SOURCE

FROM

320

fillHI'

TO

500

Hr •

dc

this

of

ac signal, resulting

ac signal, resulting

and

paragraph

tranformer. More

the

core. Core magnetization

(4) for

prematurely

in

distortion

in

distortion

a discussion of

to

saturate

to

saturate prematurely for

a magnetized transformer is

for degaussing the

not measure winding resistance

not

measure winding resistance with

current

current

is sufficient to

is

sufficient

current

than {“ateria|57 blft the details of the |°°p5 ale "_°t °f

for

level

the

with

of

of

of

of

of

to

(4)

Core

(4) Core Magnetization, Corresponding Distortion, and

Degausging

Degaussing

Excessive

Excessive current through a winding

will permanently

will permanently magnetize the core

formers.

formers. This

Model

Model AM.2 has a ferrite core which virtually will
permanently magnetize.

in magnetization

in magnetization (=B) after a given winding

been

has been reached
force, where i = current through winding).
induced

secondary

the secondary voltage

curve

curve where B

permanently

permanently magnetized core saturates

H,

of

H,
that
111-19
ically illustrate this core saturation and corresponding

distortion.

distortion. Note

loop; curves

a

a loop; curves #1 and #2
representative

loops.

loops. Actually,

with different degrees

materials;
interest
the loops with respect

the loops W'th respect to 5aturat'°n'

is

8'

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INDIVIDUAL

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OF

INDIVIDUAL

A

A

_

...._

Magnetization, Corresponding Distortion,

current through

magnetize

This is

true

is

true of

AM-2 has

ferrite core which

a

(=B)

reached

in

in

(<1

(0::

i

= current

the secondary is proportional to

the secondary

voltage is

where

B

is

is

magnetized

and thereby

and thereby reduces the maximum signal

be

can

can be transformed

shows

shows a

reduces the maximum signal

transformed without

B-H

a

B-H

a winding

the

Models

of the

the

Models

All

transformer cores

after a given

"' no. turns x i - ma

H

H = no. turns x i = magnetizing

- " 9 9

through

is

proportional

distorted on

is

distorted

not

not

.

linear function of

a

a linear function

core

without

curve

and

curve and waveforms

illustrate this core saturation

Note that

that

#1

”center

"center lines"

Actually,

the

the

degrees

but

the

in this discussion, only the

in

this discussion, only

AMOJNT

CI

MAGNETIZATION

MAGNETIZING

FOR(:(

A D

"ceuren mics"

ARE

"CENTER LINES

B-H LOOPS _.__ _ _..9

B-H

LOOPS

_

,---

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SIGNAL LEVEL IS

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L.ARGE

GO

GO INTO

INTO

ENOuGH

LEVEL IS

THIS REGION

THIS

ASSUME

NOT LARGE ENOUGH TO MAKE

NOT

CORE

CORE

B-H characteristic

the

the

B-H

and

#2

of

of

/ines"

loops

loops are usually "squarish ovals",

details

to

TO

MAKE

REGION

usually “squarish ovals",

are

squareness for different core

of

of

squareness for different core

of

saturation.

/ii3>i;;;~6~;i»;i§§E»i,~LTR~i>;i~;~,;,;ii;ivE=R-

H

IF CORE lS PERMANENTLY

,I'

COAE

THE

THE

THE

THE

AMPLITUDE

AMPLlTUOE IS

of

a transformer

of

a transformer

core of most

of

most trans-

AM-1 and

AM-1

190. The

and 190.

virtually will

cores

saturate

saturate

winding current

current

netizin

winding). The voltage

on

saturates at a

waveforms

characteristic

Figure lll-19A

Figure

of the

of

the

the

$*TURATE|-7 "Kilo" “

IS

PERMANENTLY

PAST

SIGNAL

SIGNAl.

PAST

WE,

$

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so

IS REUJCED.

The

voltage

dB/dt,

to

dB/dt,

that part of

that

part

.

of

lower

at

a lower level

current

current

distortion.

distortion. Figure

that graph-

that

and corresponding

is

actually

is

actually

11I-19A

the

loops are

general

general situation

THIS POINT

THIS

MAXIMUM

TTMT

THill

IrIWtIMUM

MOOCED.

are

are only

corresponding

corresponding

not

situation of

T

MQGNETIZED

MNlN(TlztO

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•

and

trans-

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not

not

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H.

H.

level

Figure

graph-

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so

A

A

of
of

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A

....

PRINCETON

APPLIED

MOOEl190

LOW

NOISE

Figure Ill-18. PHOTOGRAPH

Figure

111-18.

PHOTOGRAPH OF

TRANSFORMER

TRANSFORMER

TRANSFORMER

RESEARCH

OF MODEL 190

MODEL

190

lll-10

111-10

CURRENT SATURATES CORE ABOVE THIS

/lF

CORE

IS PERMANENTLY MAGNETIZED.

I

i . PRIMARY

i ‘ I i=

B 1 ' _’

B

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' SECONDARY

D i 08/di

D

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DISTORTED

REGION J9

D

ISTORT

ED REGION

Figure

Ill-19.

Figure

111-19.

-+----,t---

B-H CURVE

B-H

CURVE & WAVEFORM

LEVEL

l

I

I

FLAT

PEAK

I

&

WAVEFORM

CURRENT

PAt

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CURRENT

I slim!

ill

.....

t

WHEREM =2wl

WHERE

... 1Z".t

FOR

ONE

POLARITY

ONLY

one POLARITY ONLY

conaesimoiiis a

CORRE~DING

PERMANENTLY

PERMANENTLV MAGNETIZED

COM:

CORRESPONOlNG INOUC€D
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or

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OF

MAGNETIZED

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IN DISTORTED REGION

IN DISTORTED

CIt

REGION

)

A

magnetized
phonic
noise
magnetized
signals.
here

is

signal

is
useful
monitoring

aauem

nova $309

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Notice
not

magnetized

S8V3ddV

around
mum

amplitude.

emssnvsao

magnetized,
center-line
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if

the

core
signal.
signal

current,
corresponding
magnetized-core
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SNOISUHOXB

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S3.lV8J.VS

80:!

QNISSOBO

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compared

is

the

transformer

The

distortion

not

usually an

seldom

in

determining

the

aunoaooaa

from

Figure

wuosa/wm

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center-I ine

asvauaao

the

#2

the

same

becomes

B,

C,

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'lN38HO

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the

0832

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transformer

to

most

so

degaussing process.

uuaauno

5| '03.LUO.LSION

the

-mun

#1

If

transformer

(or

maximum

saturated

corresponding

induced

transformer

permanently

A.LlHV'lOd HJ.O8

3800

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is

when

it

objectional

because

of

high level signals

operating

large,

but

the

condition

wvmm

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transformer

maaano

and

thesignal

cé

the

core

equivalent

at

Figure

secondary

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S3.|.VOlONI

NOLLUQLSIO

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usually

is

not

noisy

magnetized.
characteristic
it

affects

problem

high level

of

._

01

that

as

long as

works

can

ma/\

becomes

works

on a loop

for

opposite

signal

current

one

of

111-19

core

magnetization,

with

large signal

magnetized

and

SW!:lO:l3/\VM

micro-

This

of
low level
described

because

the

distortion

the

core

and

in

the

core

on a loop

be

of

maxi-

permanently

around

polarity),

is

applied,

the

peaks

of

the

show a primary

and

voltage

for

input.

core

saturates

SNISSHVDHCI 'OZ'llI 9-'"5!;i

a

is

IS

a

sooner
other

To
sary

primary

degaussing

netize
polarity
initial
current
is
polarity.

magnetized
Figures 111-20A,

waveforms

IMPORTANT:
current,
voltage

with

secondary

Model AM-1

operator

......

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

for

one

polarity

polarity.

demagnetize

to

pass a relatively large ac

and

(degauss)

to

very slowly

current

the

core

in

the

excursion

of

magnetization.

slowly

is

so

slightly less

As

than

the

until

current

it

B,

as

the

transformer

Use a

1 Hz

or

so,

in

the

secondary,

a high impedance

is

protected

could

is

not

careful.

DISTORTION
ZERO

~SSING

CURRENT
DIRECTION

PRIMARY

RESEMBLES

of

signal

the

transformer,

decrease

is

initially large

direction

this

The

that

the

preceding

is

no

each

current,

object

successive

is

decreased,
longer

of

and C illustrate

becomes

LOW

FREQUENCY

to

avoid

inducing

and

monitor

oscilloscope.

with a neon

suffer

insulation

AT

ONLY

INDICATES

SATURATES

ONLY.

OONTlNUE

CURRENT

UNTlL

B.

and

later

current

this

through

current.

enough

each

corresponding

C)

and

overrides

of

decreasing

magnetization

one

of

the

the

core

magnetized

the
demagnetized.

excessively high

the

The

Model

lamp,

breakdown

8

EVERY

2!!:!Ef!

PRIMARY

CORE

IN

ONE

TO

INCREASE

WAVEFORM

for

the

it

is

neces-

the

The

to

mag-

the
the

opposite

is

less

at

all.

secondary

degaussing

secondary

190's

but

the

if

the

2

_

7 ----_.‘._

+

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DEGAUSSING

111-11

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ii

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e 10;

pue 'uog1ezg1au6eu1

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l

INDICATES
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AT

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se 1eq1

TO

INITIAL

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pue

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CURRENT_

186*“

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BLOCK DIAGRAM DISCUSSION

Refer

to

that

the

operational

'1!n01g:>

01 uge

interstage LP/HP filter circuits, overload recovery circuit,

sg '()[_H pue 55

and

battery

suog1gsod

4.1A INPUT COUPLING CIRCUIT

ZV S8>|QUJ ZV10 1ndug 6ug11e/\ug a|_|1 1e

LUL|O|!>| 9'17-Luqo Q99 eL|1 'suo!1gs0d

Individual

through

Iy,

the

apply

HOIIQJ

input

transistors

W1 1W1 05 9°“9p9dL“! lndlno Jolenuane am lsnipe '6l¥r| 1ua11n:>

megohm bleeders, R4 and R6, keep charge

Llnolbll 9lH ‘$401559’ mdlno Jolenuallg '59!J95 9L|.L '|9"9| .l9l-I10

up

on

uog1enue11e pe1gnbe1

amplifier inoperative by

Sui '9lH' Llnolql ZLH Sesudwaa Jolenuelle 95915191“! 9L|-L -uo1g/\ua

cutoff_
FET's,

the

if

u()!53nQ$!p 1311:-gwgqgs gql L]! p9u1Q'd><9 5! p9u!Lu;919p 3! [V ’>|Ol?J 6ug1un0Lu

operator

J9 W95 9H1 /\/\°H '00LX

positions are

‘p1e0q Qd aq1 10 Z1

control,

U195 aql >10 l__|O!],(_')3$ G aql '$U()!1!$Qd U195 X13 159| gql 10:1 -O||!OSO

coupling switch

-OLX 5; [V 40 U!Q aql 'SuO!],!S()d L131!/v\$ ,1n()} 1541; aql 105 10

ground

t 4.1B GROUND-LOOP SUPPRESSION

1e p8>|.lE?LU

10

eq1

A typical amplifier

ue

10 uo!1enua11e

sources, amplifier, and

1s1g1aq11o uge QQLX

scope_ This
connections
which

accompanies

that

and
and amplifier; see Figure IV-l.

10 aw;

together

1nd1no aq_|_ 'sa6e1|0/\ d0o|-puno15 8S9L|1 /\1g|dwe ‘a101a1aL|1 01

mental electric and magnetic fields. These fields,

'10u saop pue ’puno16 |eu5!s

loop,

generate

10

A||e!1ua1a11gp 1aq1ga

sources

aqi '.lO1S!S8J

due

to

10 ||e

/\||en11g/\ ’sa:>ue1sgsa1

aq1 UBL|1 1a1ea16 qonw Ma/\

s,Q|\|g

pue

pa1oauuo:>

/\|199J!P p9199UUO3

'pa|1||du1e

6u|19u1u1||a

|eap

12915 e

pwgsap

aL|110

sg

pun016 sgsseqo

ssome

uge

||e 101 sLuq0|g>| 5'91) 1gn:u!:>

Aq pa1uasa1d

qoee 101 s101g0ede:> 1ueJa11gp

11o||o1 Aouanbeq

the

Block and Wiring diagram

Model

>|:>eqpaa1S!L|1

amplifiers in

9L|1

aseanug

charging and

aeu:.|1

input

dc

blocking capacitors,

selected inputs

9Ll1 01 99U9P9dW! W195

the

capacitors, which

In

the

dc

so

that

no bleeder

signal source

should

convenient

and

when

aoue1sgsa1 sagas

U!

pawauuoa

/v\o|

LIHOHIC) H3.L'll:|

113

is

composed,

sg ‘UH

0s|e

tandem,

ug

01 L3 10 u0g10as 2|

6U[S[.ldLUOO 'JO1B|'\U8llB

test

circuits_

1se|

coupling switches select

of

positions

'Q[ 1see|1e1o

eq1 u|

'suog1gs0d

to

the

ALI n the

would

s1:>a|as L{O1!N\S uge aq110 u0g10as V

aql

offsetting

the

is

needed_ (When

cannot

bleed

aq1

CIRCUIT

1oe|es

Slam}

pue

/\Quanba11 qgq

:l:lO'l'lOH GL1?

on

page VII-2_

essentially,

’1e!u1a/\ uge

with

associated coupling,

eL|1 Aq

uge e

101enua11e >|oeqpee1

1491!/v\s-uge

the

or

select ground, and

corresponding

q:>1g/v\s

W1

Sluesald

ac positions,

otherwise render

the

input

signals go directly

in a dc

off

charge,

provide an external bleeder.)

for

using

the

01 LV

to

pue

QL

the

unused

JO

W95

use

when

sugd smauuoo

ampl ifier single-ended

input

5U!5UBq:>

BLI1

setting

should

position.

uge

aq1 p|agA 01 p8J[b€-3.1 se

uge

QQLX 10

type

between

QLX J9L|l!9

hook-up

10 ’g'Qx ‘g'Qx

Lx

10 QLX .l8L|1[9

of

hook-up

the

NO|_LvN|WH3_L3G N|V9 at-V puno16 eqi ('1apaa|q

the

which accompanies

sg pue

form

of

battery

‘puno16 sgsseqo

a loop

current

aq1

1ndu!

(Lg) 1o1sgsa1 wqo

that

emf's

and

in

the

ssome sd0|a/xap a6e1|0/\

action

at

10

8L|1

(SIGNAL

"H91!/\/\$

consists

readout

device such as an oscillo-

usually has

signal source and amplifier:

power

source

the

signal

is

exposed

01 10adsa1

currents

'sag1g|dLue

loop may exist,

the

connectors,

pun015 sgsseqa pue pun0J5

sg swqo

s||aqs

.I81O pa1e|nsug aq1 uaa/v\_1aq

R

QL

GROUND)

W140 U°!1!$°d H999

‘1ag1g|du1e puooas

‘1o1enua11e

pue

of

a signal source

‘ygx

1aq1ga ‘1ag1g|dwe

s1:>a|es

and

mounting

between

'S1U9UOdLUOO

The

two

pe:)ue1a1aJ

01

to

varying environ-

L41!/v\ pepua-e|5ugs

in

it. Various

a6e1s

sLlch

d0o|-pun016

etc. A sign ificant

QL aougg 'puno15

e 01 1nq pun016 sgsseqo

lou 5! Punol |9U5!5 9W» '5!Ll1 5U!Op 40:1

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§u0|s|/\01d

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aL|1

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CHASSIS GROUND emf CHASSIS GROUND

F~ureIV-l_

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sg (|

GROUN~LOOPCURRENTPATH

seq 311 |ap0|/\| eq_|_ 'a|qn0J1.1o

, , , ‘6u|

e6e1|o/\

pue sg

A||ensn

/\||eg:>adsa

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(DISTRIBUTED

AROUND LOOP)

L"/\|

JO1BnL1911B

SECTION

10 pesodwoo sq

saL|01g/v\s

DH

DESCRIPTION

110||01

9|dw!S

eqi

IV

part
the

Note

of

two

aq_|_ 'Q()[_X

ug

paqcug/v\s | l

1:01

J8L|1OUB | a

q1g/v\

91E‘.|9dO

He

10:; H

inputs direct-

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1o11gn91g0

field-effect

1°19nu9119

the

100

from

building

the

FET's

to

to

the

position,

-[V 10; aomos

then

the

The

ground

/\qa.|aq1

the

zero

‘L131!/v\s

‘Lg

the

be set

to

the

very
ground-loop
signal, and,
of
this

-

For

to

betWeen
chassis

signal

1ueog1!u6gs

the
first amplifier stage amplifies,
single-ended with respect

am umm

therefore,
signal

sq1ed pun015

ground-loop

4.1C GAIN DETERMINATION

1eq1 :1eg1g|dwe pue

pun016

The
amplifier,
interstage
second amplifier, as required
each position

a6e1s1a1ug

or

q:>1g/v\s uge 8L|_|_ Bql

two

ground

that

rack,

·the source

do0|-pun016

ground

1a!1!|dwe

paths

sg geugs

cutting

other

as

current

the

1s1g1 5U!Pl!"q

aql

|eu6gs

sgsseqo

01

For

eql

For
switch,

0192

thereby
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9111 uaq1 ‘amqo 110 paa|q 10uue:> aomos |eu6!s

for A

'U0!1!50d

9H1

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A section

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level.
R 19, adjust

OOL

attenuator

199H9"P|9!}

circuit

PUB

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For
feedback
operate
another
switched

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dOO|-pUl’\O.l5

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|eu6gs

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4.10

The high
simple RC filters
roll

NOl.l.dlHOS3(]

I\I

frequency
is

NOLLOHS

attenuator

HJ.Vd

mauuno

GNHOHSHSISSVHQ

of

the

signal

good

trouble_

ground-loop

doing this,

chassis ground

ground.

ground

ground-loop

snope/\

is

gain switch selects

aomos

the

O1

19$ eq pmoqs ldu!

the

papua-a|6ugs

eq1

is

determi ned

X @39nON' fX

ground-loop

ground

~ @

path,

(it usually

voltage

' dOO‘1 CJNHOUQ

at

very low signal levels, can cause a

VOI

The

Model

voltage

the

Q“ BOON T (ONHOHS WNSISD

but

the

insulated

Since

and chassis

V 'o1e

se qaps ‘lsgxe

aq1.uae/v\1aq |eu6gs aq1 saguedwoooe qogq/v\ 1eq1

0/v\1 seq

U8 SB qans 90!/\8p

first

voltage develops across

'1!

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amplify these

Bug/ue/\

referenced

either
attenuator,

01

0/v\1 aq_|_ '1-/\| a1n6g:| aas f1ag1g|du1e

components_

pue BOJHOS J9MOd

xO.l,

|eu6gs

e 10 s1s!suo:> dn->|00q 1a!1!|dwe

of

the

NOlSS3HddS

four

last six gain positions,

Sl,

connects

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changing

the

is

d00'l-C|NnOu9

(dO°3°fng§‘a"l%§§)

W3

voltage (V

especially

is

and

should

is

amplified along with

1~3aano

113

has provisions

from

N N

~

signal

ground

to a 10

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shells

10

ohms

ground

's1o1:>auu0o

Aew

doo|

ug

sluauno

to

aseqi .Sp|9!}3!19u5ew

ground-loop

pasodxa

to

chassis

aamos

A||ensn dn->|00q

|eu5gs

either

1nOpB8J

xO.2, xO.5,

and

either

switch.

switch positions,

1eg1!|du1B

explained

PBSHUH Bql J01 L|01!N\$

pins

10

gain

of

|eu1a1xa ue apg/\o1d

0Nn0a9as|ssvH:>

I)

i~

the

be). This

the

signal being amplified_

~

is

not

ohm

resistor (R7)

of

is

very much

resistances, virtually all

1e uog1oe

aq1

aql ug wanna 10 sazunos

either

pue snuua

signal

ground,

sg

leql

ground,

Sq],

aq1 use/v\1aq suogmauuoa

xl0

or

xl00

pue

or

xl

xl 0 or

to

yield

dOO"l'ClNOHE)

the

the D section

eql

5u!Sn

and

12

A 1

to

xl

in

the

‘L-Al

@1"5!=l

is

developed

~

~

chassis

ground

portion

the

great

for

eliminating

'

connected

directly

connected

the

input

BNC's and

greater

the
differentially

pug Omoala wluaw

voltages.

d00|

saguedwoaoe L|1)!L|M

10

ad/\1

’J8!,l!|dlLl8 'S9OJnOS

attenuation

xl

the

gain

u9L|N\

of

00.

How

schematic

A1a11eq 01

resistor.

a1e1aua6

and

does

The

e Lu101

and

is

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of

00

gain

gain

marked

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of

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of

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ROLLOFF FILTER CIRCUIT

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ground

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4.1

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nickel-cadmium

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outputs

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tion

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batteries,

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4.2

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4.2A

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0102

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voltage across

voltage across R lOS. R 1

the

the

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biased (so

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0109B
0114A

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CIRCUIT

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DIFFERENTIAL

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amplifies

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reverse

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input

input

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forward

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needed

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a test

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FFERENTIAL

field-effect transistors

field-effect transistors are involved

gain

gain and

voltages of

that

that

(5 V).

voltage

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junctions

junctions

currents

currents

0101B,

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to

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by

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resistor at

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recovery

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5 &

6)

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between the

discharge

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fast

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rectifier

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+

+ & - rectifier

batteries.

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needed

schematic on

schematic

when

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dc lines.

dc

lines.

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circuit

circuit

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DESCRIPTIONS

DESCRIPTIONS

input signals

the

the

input

operational

of

of

operational

prevent amplification

and

prevent

constant

constant

8105

8108.

of

both

and

and

both

emitter

their

their

emitter

approximately),

approximately),

held

are

(5

voltage becomes

emitter

emitter

Q1148.

0114B.

constant

constant

C8101 and

V).

CR10l

biased by

becomes

will conduct.

diode

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will

collectorjunction

collector

of

of

the

without

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biased

Q100A

of

of

0100A

and

and are developed as voltages

bases

the

bases

followers

followers which provide drive for

Up

capacitor

shunt

and a

tions)

tions)

selected

selected by

filter

is composed

is

LF rolloff

LF

rolloff switch and

the input

at

the

in

given

in

FAST-RECQVERY

FAST·RECOVERY

button,

connected between each input

eenneeted

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stewed, and iuriie en

the

the

between

between the input of

LP and

LP

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Overload

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down

outputs are

outputs

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charge

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un

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so

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For convenience

For

convenience

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provided.

PREAMPLIFIER

PREAMPLIFIER (A

page

on page VII-3. This circuit differen-

signals

amplification

current

current

05

Q100

0100

the

and

Up

to

to

and

and R

A &

A & B

sections

sections

junctions

junctions

the source-drain

the

at approximately

at

and

CR107

collector

the

the

collector

larger

larger

conduct.

junction

input

input

being

being damaged;

oondnot_

conduct.

&

& B pass

developed

are

Q109A

of

of

0109A

now

to

to

now

by

the

HF rolloff

the series

composed

switch

input

Section

Section

when

pet‘/Veen

input

input

input capacitors,

input

the

HP

recovery

bV

by a

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of

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and the

A2.

to

to

A2.

Ill.

III.

pressed,

of A2_and

of

the

The

The

CIRCUIT

CIRCUIT

turns

input

eeen

A2

ground.

and ground.

capacitors,

of

input

capacitors, °9‘“".‘°“'"?°?"e

filter

filter

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e

transformer,

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so

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transformer-rectifier

transformer-rectifier

while

while

simply

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with

dc

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the

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u$eCl-

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operating

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checking

in

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(A1)

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the

at

at

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amplifier

amplifier feedback

8108,

Rl0S,

8119

119

8 to

source-drain voltages

approximately

C8107 are

FET's

FET's

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and

and

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amplification

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circuit

gates of

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provide an ave rage

to

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have

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two

in

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common-mode

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thereby

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fixing

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average

an

of

base

base of

are

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constant 0.6

constant

voltagesof

the

the

protective

input

are

input

protective

Q104. If

about

about

current

current

C8104

CR104

handle

can

the

to

to

the

as

provide

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0104.

-3

-3

to

to

they

they

collectors

collectors

voltages

Q109A

0109A

drive

has been

voltage

voltage of

than

than

The

The

and

and

can handle positive

damaged;

Q1098.

01098.

series

1.59

1.59

transfer

transfer

e FET

C1 and

Cl

and

and

A2

A2

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then

then

12

12

supply

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it

If

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from

from

plugged

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provide

the

the

1)

A

A &

over-

over-

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that

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forward

0.6

voltage

voltage

\/,

V,

the

path

path

ground.

ground.

positive

simply

simply

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rolloff single-ended

HF

the

on

pi

of

V

V

&

the

the

of

of

V

V

of

If

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is

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for

for

and

for

differential

single-endeq for each half

signals

signals cause

provide

to

to

provide equally and

their

to

to

their

cause

to

to

cause equal changes

Q1148.

and

and

0114B.

emitter

emitter

signals

signals

taken

taken

Q116

0116

0117.

0117.0117

drive

drive

Osin

O

Opposing

pp

common-mode

circuit.

circuit. This

keeping

keeping

common-mode

common-mode

appear

appear

C8108

CR 1

OS

Q113_

0113.

Constant

constant

forward

forward biased.

taken

taken

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below.

Q111A

0111

voltage

voltage at

base

base of

opposite

opposite signal

inverts

inverts

Q107

0107

transistors

transistors

providing

providing balanced feedback

FET's.

FET's.

The

The

keep

to

to

keep

peint

point

output,

output,

taken

taken

however,

however, we really have

tier i00p$ that

fier loops

reieeti0n-

rejection.

The

The

eerninen'rn0de

common-mode

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sources

eernpenent

component

Q111A

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summing

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feedback

feedback

e0rniTi0n'n10de

common-mode

aide

aids

requirements

requirements

from

from

The gates

The

reference points of

reference

the

the

these

these

for each

the

cause

the

equally

collector

collector circuits, and

changes

equal

Differential

Differential signals cause no change

currents

currents

Therefore

do.

do.

Therefore

from the

from

shifts

shifts

0117

the

the

This

QR112

CR112

from

from

A and

of

teedbeek

feedback action

\/0ite9e-

voltage. Since

tir5t

first feedback

the

the

the

the

gates

sources

sources

operational

emitter

the

the

the

inverts

inverts

Compiementary

complementary

the Q114A

the

0114A

9

because

is

is

because

voltage

the

the

voltage across

the

in

in

the

temperature-compensates

temperature-compensates

and

and

()_6

0.6 V junction

biased.

the

the

Q1118

and

0111 B compare

the

at

the

Q111A,

0111A,

signal

Q111A

the

the

0111 A collector

Q108.

and

and 01OS.

that

that

balanced

summing

the

the

summing

condition,

this

th

is

condition,

advantage

advantage

really have

we

that

ieedpeek

Currents

currents

Q100

pi

of

0100

Oi the

of

is the

the

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to

the

te

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feedback from

of

of

following discussion.

following discussion.

of the

of

the

points

the

the

operational amplifiers

half

emitter-coupled

emitter-coupled

and

circuits,

Q114A

of

of

0114A

emitter

Q114A

0114A

.

signals

S'gna|s

signal

signal

collector

collector

CR113

CR113

iunotion

V

The

The

output

output

of

base

base of

and

and provide

currents

currents

of

oppositely

oppositely

and

in the

in

the

signals

and

and

common-mode

the

the

common-mode

resistor

resistor R146.

collector

collector voltage level

Q114A

the

the

0114A

Output

output

nd Q114-B

and

0114B

a

that

may remain in this

may

that

common-mode

the

the

common-mode

across

component

component

currents

currents

are

are forward biased

dr()p5

drops

primary

primary

through

through

compare

Q1118

0111 B to

provide

to

to

collector

and

Q107

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and

junction

the

drive

drive

the

junction

feedback

eetien 0t

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determine

determine

teedheek

feedback

the

reference

reference

the

edrnpenent

component

the

two

of

en Operetienei

of

an

operational

point

point

teedbeek

feedback

being

being

determining

of in

of

in

determining

twe

two

Qein

gain and provide

eempenent

component

trern

from

threugh

through

B te

A 81

A & B

The hi9h

The

the

two

corresponding

corresponding

to

$i9nei-

input

input

signal.

point

point

high gain

Spureee

sources

two

two

t0

to

Qt

of

the

irern

the

gain-determining

gain-determining loop,

input

input

FET's

separate

separate

amplifiers

the circuit.

pair,

pair,

changing

changing signal

common-mode

common-mode

collector

collector

cause

Q1148

0114B

8146.

voltage

signal,

signal, and helps

out

outputs

remam

8146

R146

of

of

the

the

forward

gain-determining

gain-determining feedback

8131,

R131,

common-mode

the

the

common-mode

a reference

to

a reference voltage

corresponding

corresponding

their

their

signal

signal

Q108

010S

the

to

to

the

voltage

voltage equal

i5 u$ueiiV

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the

the

dependent

dependent

end

We

we

Q107

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R123

R 123 and. R

epuntereet

counteract

In

and

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e0rnpieteiV

completely

input $i9nei-

input

Output

output

FET's

operational

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summing

summing

must

must

circuit.

the

of

But

But

differential

Q1148,

Q114A

0114A

pair

pair

uts

F.)

constant,

constant,

that

that

Q114A

0114A

emitter

keep

keep

and

and will be explained

collector

collector

to aid

to

aid

of

of

sources

sources

equal

usually

only

only stable

gain.

gain.

pr0\/ide

will consider

end~

this

in

this loop

the

the

the

Oi

the

signal.

can

can

be

be satisfied simulta-

and

and

0114B,

currents

signal

currents

signals

signals

Q114A

currents

currents

no

but

but

.

m

emitter

biased

are

are

ernpiitier

amplifier

stable

Wiii

and

the

base

base

loop,

be

be

of

of

change

common

common

feedback

feedback

level

and

Q118

011S

this

this

tms

feedback

feedback

would

would

Q118

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will

Q1118

0111 B in

8123

R 123 and R 126,

to the

to

taken

taken

operational

operational

e0n$ider

end

R126

the e0mrnen'rn0de

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in

in

considered

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points.

points.

satisfied simulta-

0114A

signal

signal

for

for

helps

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and

Wa

way

V

.

part

part

loop,

loop, in

cancels

cancels

otherwise

otherwise

Q1148.

and

and

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junction

junction

diodes

diodes

and

and

feedback

explained

be

feedback

feedback

voltage

equal

equal and

circuits.

circuits.

in

complementary

complementary

and

the

of

of

the

i5 Sueh

is

reference

the

reference

ir0rn

from

condition,

condition,

In this

In

this circuit,

e0rnrn0n'nn0de

common-mode

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126

drive

common-mode

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the

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amplifiers,

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Both

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in

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mode

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cancels

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the

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whose

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the

at

at

the

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driving

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input

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see

the

ugsegq 121a/xas Si-)p[/\OJd

voltage required

the

.|.|QH|Q

how

gain-determining

network,

at

0 V and the gate voltage

the

source voltage

source voltage

9941 4| P9999“

drops,

-59!.l91lQq

of

network

which are ignored here).

wngwpeo-|a>|01u

feedback

output

_' ‘E? + abli

that

feedback

9U!| 9V '9'll/\ 9599 UP

to

current

be satisfied with

comprise

gain. Even though

affect

the

to

the

Therefore

R131 and

auo sloauuoa

paoua1a,Leu-Jeuez e am

divider

the

common-mode

the

source

‘11n:u1:> .l9p[A!p

set

as

an

of

0100A

10“ S! u°!19|n59J 49910

apg/\o1d

voltage

s1nd1n0 A|ddns

it

would

to

'9591|°" 9u!| 99 SIJGWJOJSUQ41

can satisfy

P449 OOVHO

to

9141 PU9 '0O’vi

through

-10 V at

.l.lQHlO

'919J8dO

9]_()N

R123-R128,

junction

R128

123

network

.|.SE|.|.

feedback's

currents

example

u1aq1 a61e|.10 A||es11eu1o1ne

the

)\'lddS HElMOd

output

latter

0111 B as

it

all

input

(and

the

-,ua11eq

divider ratio because

5! ‘491!N‘S 991 “GUM

9 4| 'dwe| |9ued

and

to

'$1!'194!9

's101s1sa1

of

aql ‘amqosgp

of

0100B

0 V

/\ 31 q11/v\ palunqs

be

force

the

junction

these resistors, allows

9!19w9L|95

4.2B OUTPUT AMPLIFIER (A2)

4'17 UP!1999q'1S

'(

Refer

to

LlZH"9LZH

e101e1aL11 !a6e1|o/\

aql

CR203

1u10d Bugwwns

and

biased, and their forward bias voltages

O1 9591|O"

bias

input

17139

0201

asoq/v\

discharging

'ZLZO

the

VOZHO

operation

@411

signal.

‘Z139 5u!/\!Jp

are

R204.

CR200

voltage

pue 9139

is

sapogp pasegq pm/vuo1 em

40

OVL

'17lZO

B/\!4P OLZO

1139 's1gn:u1:>

The

gates

/\|91!$°dd°

reference and

U9 949

amplifier.

apg/\o1d

0203B,

OLZO PU9 60ZO

qogq/v\ we/v\o||o1

0205
common-mode
to

the

common

primarily responsible for

5959140/\ l9U5!9

494

the first stage.

VSOZO

thereby

ugmp |eu61s-|e11ua1a111p aq_|_ "9139

0203A

/\|91BLu!XOJddB

the

uyelp-evmos 9L|l -- /\ 9'0

4° $4°199||°9

fixing

and

emitter

'UP!55'19$!P

the

schematic

$49P!'\!P >l99qP994 /191 P944!4444919P

input

protective diodes, biased

8L|1

Notice

lndlno 51! 51341499

and

CR202.

at

two

diode

dac->>| sdo1p

a field-effect

the

filter

U0!10Un[

recovery

this switch

of

P449 /\l|9"P9

The

0203B
junction

Jellgwe

PU9

5u!d|='->14

J0} |8/\9| 958140/\

101091100 .l!9L{1

field-effect transistors

summing

first stage

A &

B,

rejection.

source

$9 P9<1P|9/\9P 949 /19941 9499/4/\ '8€OZO

0202
the

19 1u91'5u00 p|eq S! 9

1449459!P >i9P|q 995)

on page VII-4.

1u10d

a:>ueJa1a1

01

dae>1

that

pa11nbe1

CR201 and

49!4!|dU~'9 leuonelado

This scheme fixes

drops

(about

u011oun[

transistor

capacitors (see block diagram)

991

button

ELZD 4!9d

is

off

404

9P!/\°4d Ll9!L|/V\

inputs

'OLZD

of

A2, comprising

.l911[LU8

and

0206,

0206

point

'8LOZO PU9

the

provides

9L|1 P1 $399 8 '2 V

voltage across
are forward biased, so th at --because

voltage

lnoqe 19

used as a switch for

S91ESu9duJ09

is

pressed. During normal

14191419 /\491U911'9ld444°9

and

does

6020 I->141

|@u5!$

101091100

01 sluauno

0205

of the

PU9

am 93039

is

a differential stage

provides

VLOZO

of

0205

common

constant

R213

12 V 9030

of

a forward biased silicon

lUB1$U09

and

the

feedback

has already been

the

operational

is

now

apparent

three

operational

together

in

satisfying

requirements, and

feedback

Rl06

and

R120

feedback

01 1!O.l[O

connected

the

of

R123

pa61eL1o eue

gain

u1 sa6e1|0/\

aql

to

the

L{O1!MS

the

3099 pue

R126)

voltage

s1q1 101

ugpuodsz-moo

to

sources

and R126

sag1a11eq

is

equal

to

sum

of

R123

1sa1 /uaneq

equilibrium

1099 wnuuxew

and deter-

force the required

to

establish this

AH3.|..|.V8

feedback

proper

palegoosse

to

avoid loading of

pa0ua1a1aJ-jauaz

the

gate voltage of

0100B

must

(not

counting

0p 8L|1 ssome

quite

impossible

current

loop. However,

P9!4!1994

M1

of R 123

Aq

U/“PP

9941 P1 49498

the

output.

is

operation,

49!4!ldl449

at

+1

10 a1e1s e

be

1991 05

Without

through

3! 0Oi7.L

P999913

C|Z'17

neces-

V.
+1
small

OZ‘?

0LH"6H

CR200

01 |enba

aql

sg an1e/\ 4a/\a1eq/v\

CR203

(about

1 V).

/\

90390

not

6039

'4!9d

A2

60ZO

constant

A &

mode

SOZO

current

ssone

at

through

5! ZV

4°

through

a6e1|0/\ _S939u

R203

are forward

0.6

V)

reverse

the

maximum

'P959!q

P49/‘A404

9'0 1ue1su00 331810

pue

90391)

when

9m1BJ9duJ8l

load

the

input

$148/W!

ZLZO

aql

Bugueqo

|eu51s

A & B are

P9|d"P9-4911!l449 U!

operational

494

0202,

0203A,

V3039

pue

current

l4°!l99!|d<19

B,

and

P1

rejection

to

R213,

4° 5114944419

a6e1|o/\

about 3 V.

10 S85B1|0/\

J0l‘5!5UBJl >|:>eqpaa;,

$1

that

in

in

uo

the

of

the

991 uaq/v\

the

aql

9141

pue

In

V

the

am

for
the
the

and

the

PU9

U!95

914.1.

Sugqs

the

9/\!4P

with

is

PU9

of

aql

uo:>1|1s pasegq

transistor

asneoaq

voltages of

'/\ 9 lnoqe

the

voltage across R213.

‘$139 01

currents

10 uo11:>a[aJ apow uowwoo

and

0203B,

pue '9

sg

application

lueuno

1:1!/v\ @6818

0207A

'vs0z0

for

drive

||2u011e1ac10 3V aql

emitter-coupled pair, which provide equally and

8.19

84.11

changing signal

shifts

the

lndu! am

0212

inverts

|euu0u

complementary

(u1e16e|p

temperature

LIQUMS

J04

CR205
constant
forward biased.

GSJGAGJ

The
whatever

9039

voltage equal
gain

(/\ 9'0 lnoqe)

operational amplifier adjusts its

pm/vuo1

q6no1q1 pasegq ‘sepogp

L|6I’\OJL|1

of

and

R9-R10

4.2C

aql

s/v\o||e

Refer

to

pug SZLH JO

stepped

IJGAGMOH

am

T400

is

aql

q6n01L11

transformer's

101

a|q1ssodw1 algnb

are

shunted

aql 1n0q11/1/1

the

across

News

6u11un0:>

so

that

/\ 1+ aq

a

state

u|

-/\

1+ 1e

automatically

10 a5e1|o/\ a1e5 aql a|dLuexa

Zener-referenced divider circuit, comprising

10 6u1pe0|

and

associated resistors, provides several biasing voltages

‘uo11e1ado

the

amplifier circuits.

S!

SW1 qsuqelsa

4.20

p8J[nb9.| 8L|1 @2010;

pue

-1:-nap

0301

and

uJn11q1|1nba

battery
the

voltages

aql 01 |enba s1

batteries are charged sufficiently,

9319 pue

the

panel lamp.

9$n999q

9H1

when

the

sevmos

40

corresponding

sq], 01 paloauuoo

on

for

th

959110/\

OZLH

>|aeqpaa1apow-uowwoo

u1

pue 'SlU9UJ9J!f1b8J

Bug/\1s11es ug 4aq1a6o1

|eu011e1edo

12111,

luamdde

|eu011e1a0o aqn,

uaaq Apea1|e seq 1a11e| aq_|_ '11n:u1o

pm/vu01

is

constant

os ‘pasegq

-- 1,291

0205

112

1uz_-wno 1ue1su0o sap!/\01d

of

0205

where

>9 V 9039 10

to

0207

1ue1suo:>

|@!1u=-vamp B S! '90z0

and

0207B

Bwwdwv

‘zozo

0209

78 V SJOlS!SUQJl 1381.118-p|9!:|

8

currents

0209

peol mu Saop

the

ugmq

>1:>0|q aas)

compensates

Q"

and

CR206

0.6 V

-(A

am Sax“ awaqos

am 90399

value

to

00390

A2

is

determined

(see block diagram discussion,

POWER

.1nd1nO am

'S.lOlS!S8J asaql

the

schematic

uomunl am O1

down

by

.dOO|

rectified by

lueuno

ac line voltage.

with

‘(z-zuaq pa10u61

dc supply

other

BATTERY TEST

10u)

regulation

1snu.1 90019

of discharge,

9001910

charge

pgo/xe 01 sluauno

.l8C|OJd s,>1:)eqpaa1 uguguualap-u1e6 aql 101

>peqpaaJ

01 >HOM1au

(9319

0302

are a Zener-referenced switch,

9L|1

test

switch

wns

9111

in

the

uge aJ01a1a|.|J_ "sluauno

9319 10 uo11:>un[aq1

0!1BJ

switch

'8ZLH-EZLH

eul

battery.

is

circuit

>|aeqpaa1 9111 as1,|dLu0:) (1V 10 apow

PU9 90lH

aeJq1

/vxou

se 91119 pue V1119

aq1

pue

e 10

a6e1|o/\

at

about

A & B

9139 ssome

sap!/\o1d

and

collector

0209

'p9SS9.lC|

output

pm/vu01 we

is

held

A & B pass

they
A and

aql 101 a|q1su0dsaJ /\|!1eLu1Jd

are developed

lugod azunos

0207B.

9039

are

emitter

‘zv 40

10 slndug

0210.

to

their

voltage level for driving

pug HO S! qollms

signal for helping

s1

pair

smlloedeo 131111

the

The

uo11nq

are forward biased

junction

L

lnoqg)

drops

gdmp

Slqi ZOZHQ

sa6e1|0/\

pue 10399 1eq1

is

required

the reference poi

'17-1|/\

segq pm/vu01

to

uo oglewaqos

aed

by feedback dividers

(zv) H.:.“:"_|dWv

SUPPL Y CIRCUIT

19 A OL_ WM

L|6n01L11

on page VII-5.

T400,

and

am Msnes

CR400

a:u01 01 a6e1|o/\

aq p|no/v\

12

V nickel-cadmium batteries. Batteries

outputs

/\ 0 V001910

9pOw_uOww03

01 p9J!Hb8J

pue 9319 ssome) a6e1|0/\

6u11e1s

connects

01 8319

same polarity

If a battery

J9P!/\!P

is

qnoqn,

to

operate.

PU9) 8ZlH

1ndug

>110/v\ s>|0eqpaa1

||e se/\|o/\u1

s1 11 1nq

lndlno

and

we qogq/v\ 'sdo1p

is

not

needed.

10

a6e1|0/\

the

transformer·rectifier

958110/\

them

while

ue se

aomos app, ugpg/\01d mum;

Japwp am qnoml

CIRCUIT

Aq uaas

one

pue

9L|1 199449

pressed

pue 1319-9319

Note

that

ua/\3

aql uo

Jag11|du1e

‘d00|

aql 11.1011 >10eqpaa1

uo11oun[ .l91l!UJ9 9L|1

0.6 V --

constant

a6e1|0/\

differential·signal drain

to

the

'u0g10a[a1 apow-uowwoa

P99

followers which provide

@5818 18114 9111.

ugwums pun a:>uaJa1z-u

0209

collector

0213
emitter

DGHGJPIGIJ

the

99039 pue V9039

at

approximately

sq], 6u1x11 /\qa1aL|1

'a6e1s

3039

collectors

as

signal voltages for

uowwoo

>2 \-/ sozo

'9

and

0210

JO S8196

circuits.

SW1 uonejado

0210

/UGAOOGJ

and

0214.

aql

junction

diodes

keep

9p()!p

keep

a/\g10a101d lndug

xaeqpaa} apOw_uowwO3

the

U83 leql >|J0/mau

The

11 >|0eqpaa1 apow-uowuuoo

0213

0/v\1

1e

pug 00389 Sen

J!8b|1

output

a:)11o|\| 17039

the

summing

nt

voltage;

pausnes aq 01 d00|

luauno

aqm,

Subsection

lndlno

6u1:u0,1

Ac

line

low-voltage

CR401.

S400

lndlno

+ & - rectifier

provide sufficient regulation

e6e1|o/\

aamos 9L|1 a|dwexa

@126

em

operating

1as ‘>110/vuau J8p[I\§p a|.|1

am

962110/\ 1nd1n0 aql ugugw

aq uea

battery

1919 10

for

0302

01 >|:>eqpaa,1ap0uJ

is

low,

in

the

sauguualap

'u1e6

PU9 '€ZLH

spuadap d00|

|BUO!1B.l8d0

do0|

1eq1 101 slndug

aomos aql pue

If

the

batteries

pue /\ 0

CR300,

Gas

Moq

acunos-aomos

se ‘9319 pue

at a time,

wns aL11 10 01124

both

batteries.

aomos aql sag|ddns

conducts

the

lamp remains

199 PP 8 '8 V OOLD

the

direction

power

switch

'9Z|.H

'uge66u1u1uua1ap

L1109 's1ndu1 1:-)1,l1|dLue

apow-uowwoo aql

5U[[I)Jl259.4

apow-uowwoo aql LLIOJ}

I-Jql Aq

source-drain

1s11,1

aql

of

0203A

3L|l 01

’as0z0

'1@!4udwB

are an

oppositely

8L|_|_

0211

.|eu5!s

0212.

drive

the

-|/\9 aql

CR204

6u|6Jeqos|p

of

0212.

logo

whose

and

0214

969110/\

1ndu1

‘pasegq

pue

voltage

pue

point

90390

am

therefore

01

19199

R216-R217

4.1).

8z.V

W95

‘9319

ug

power

output

Japwp

selects

10 an|e/\

a1e6-azunos

the

Aue

outputs

are in

sgql

circuit

from ac. A

12

will

v0010

0300,

apgse

Mes

Oi .95el|OA

wanna

to

wh ich

applying

If

and lights

uowwoo

out

of

10 su0!10un[

must

1eq1 .l9p!l\[p

uge 001x

'L‘8LH

1nd1n0

_|_3:|

0/v\1

1a1,L1|dwe

passnasgp

A|sn0eu

to

the

is

of

to

the

the

the

be

aql

aql

IV-3

V

SECTION

SECTION V SAFETY NOTICE

WARNING!

WARNING! POTENTIALLY LETHAL VOLTAGES ARE PRESENT INSIDE THIS APPARATUS. THESE

INSTRUCTIONS ARE FOR USE

VICE

VICE INSTRUCTIONS ARE

DO NOT PERFORM

DO

NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED

TIONS

TIONS UNLESS

apparatus

apparatus under voltage shall

skilled

a

by

by a skilled person who is aware
source, terminals may be live, and the opening

source,

The apparatus shall

The apparatus shall be disconnected from all voltage sources before it is opened

maintenance, or repair. Note that capacitors inside the apparatus may still be charged even

maintenance,

paratus

paratus has been disconnected from all voltage sources. Service personnel are thus advised

several minutes

several

fuses

any

any fuses are replaced, be sure

same

the

same type. The use

the

POTENTIALLY

ANY

UNLESS

terminals

has been

minutes

type.

YOU

YOU

under voltage shall

person

are replaced,

who is

may

repair.

or

disconnected

after

after unplugging the instrument before assuming that all capacitors are discharged. If

The

use

be disconnected

LETHAL VOLTAGES

BY

FOR

USE

SERVICING

ARE

QUALIFIED

ARE QUALIFIED

avoided

be

be

avoided as far as possible and,

aware

be live, and

Note

that capacitors

from all voltage sources.

unplugging

sure

be

makeshift

of

makeshift fuses and the short-circuiting

of

to

to

the

QUALIFIED

BY

QUALIFIED PERSONNEL ONLY.

OTHER

TO TO SO.

TO TO

as

hazard

the

of

of

the hazard involved. When the apparatus is connected

the

opening

from

instrument before

replace them

replace them with fuses

fuses

SAFETY

ARE PRESENT

PERSONNEL

THAN THAT

Any

SO.

Any adjustment, maintenance and repair

far as

all

and

possible

involved.

covers

of

of

covers or removal

voltage sources

inside the

with

fuses

short-circuiting

the

I —-

NOTICE

CONTAINED

adjustment,

and,

When

removal of parts

or

apparatus may

Service personnel

assuming

of the

of

the same current and voltage rating and

1

APPARATUS.

INSIDE

if unavoidable, shall

if

the

before it is opened

|— i

THIS

ONLY.

maintenance

unavoidable, shall be carried

same

TO AVOID

TO

AVOID ELECTRIC SHOCK,

THE OPERATING

IN

IN

THE OPERATING INSTRUC-

apparatus

of

that

of

of

is likely

parts is likely

be charged

still

capacitors

all

current and

fuse holders

fuse holders are prohibited.

1

ELECTRIC

and

repair

carried

be

is

connected

to expose

to

expose live parts.

for any

for

any adjustment,

thus

are

voltage

prohibited.

are

advised

are

THESE

SHOCK,

INSTRUC-

opened

the

of

of

the opened

out

out

to a power

to

a power

live

adjustment,

even if

discharged.

the

if

the

to

to

rating and

SER-

SER-

only

only

parts.

ap-

ap-

wait

wait

of

of

If

L‘/\

@ (Annexe)

|eu6gs a1.|1 aueqo

;o aueqo

ugewm lsnw JO18l1Ll311B

aql qlg/v\ J01E’J3U35

5.1

INTRODUCTION

The Model 113

H91!/V\$ W95)

give

trouble-free service.

however, alignment may be necessary, depending on

O08 01 L191!/W5 HQIIOH

Q_8L|1

circuit
and

testpoints

photograph and

aql ;0 1nd1n0 aql loauuoo

VII.

8L|1 ;o

5.2

PRELIMINARY

Before operating from ac line power, make sure the
rear-panel switch
voltage

wnwgldo

installed
operation, located
ac line power and energize the instrument.

NOTE: This alignment procedure assumes

in

nents

'z|-|>|

make sure of this by making

signal checks before and during alignment.

5.3 EQUIPMENT NEEDED

U0 ZH>l

(1) Sinewave generator,

aql uo

(2) Oscilloscope,

mV

'z|-|>| QQL ‘>|d->|d

(3) Precision rms voltmeter, 0.1 % accurate, such as

Hewlett-Packard Model

-mo

(4) Dc voltmeter, capable

mV, and capable

(5) Variable

(6)

Attenuators,

/\ 1 01 e6e1|0/\ sgw aql 1sn[pv 'apn1g|dwe

p|n0/v\ 1,2141 maoo

2 leqa, os JO1BJ8U85 |eu6!s

|eu6gs sq],

is

a stable, reliable

PU?

QLI1 19$

'Q(]

the

component

1nd1no

qcng/v\s 6ug|dn0:>

01

aqm,

:lH QLI1 '(]NE) 01

belongs to. For locating

mentioned

V s,g[L

'1ndug

the

circuit-board

01 1o1enua11e lzgggz I-)L|1 1:>euuo3

aql 5Ja1aLu1|0/\

If a component

'O(] °l LI°1!'V\$ HQIIOH

in

aql

1nd1n0

,10

instrument

lndug V s,gL1 aql lag

this section. refer

aql 01 101enua11e

|apo|/\|

layout

pue ‘1o1e1aua5 |eu6gs

Nollvaanvo NW9 9.g

is

in

the

position indicating

to

be used, and be sure

Jo; sawp,

(1/16

the

instrument

90$ ‘>|d->|d

00L W"W!U!W 1°}

'(1nd1n0

Ae|dsgp

/cm

sensitivity.

|9.l9l\9S 91 L{5n0.lL|1

A for

115

on

inside rear panel). Then

/\

aql

e uge1qo 01 /uessaaau

500

'ZH>l ODS 91

/\

'9dOOSO||!OSO

ZH

00LllJnll1!U!W

of

'ZH>|

dc

supply, floating

2000:

'Q(] 01

are defective. The technician should

'uog10a[a1 apow-uowwoo

the

proper size line fuse

V operation

01

'00l

Z 01 10191:-aua

the

or

W95

Ell

appropriate voltage and

9lLO PUB

paloauuoa

01

500

kHz range, low distortion.

kHz frequency response and

|°J1U°9

Z 01 1o1e1aua6

400

SL1}

of

measuring 0 V

1<>4("rc1v HWC))8LLH19"!PV

measuring

L01 L191!/V\$H°|l°H

1 and 10:

saqoll/v\s

||!1s) adoos0||g0so

se uge

HOIIQH

EL.

Aq p81BO!pU! SB

11 V to

output,

1,0.1%

6u!|dno0

ALIGNMENT

1ou saop peo|

01 paloauuoo TGV NO“-QHPBH 360'/WNQWWOQ 93

suu uogsgoeud

H91!/\/\$

diagram

()1 sdals

1/32

I9P°/\| QLI1 198

|eu6gs aq1 1sn[pv

QOLI) 15n!PV

|eu5!s sq], lsnfpv

12 V max.

' ' ‘ ‘ aug|

accurate.

lndug

5.4 A2 FET GATE SOURCE ZERO ADJ.

'(8pOLU

O1

V GL|1

(1)

1ug0

(2)

—e"!QS0 adoasomoso eul q1!M lndlno aql JOHUOW 19L}/V\ U0 5UlpU9d8p

(3) Monitor the

1e

(4) Adjust R211 for 0 V (±2 mV).

(5) Remove the clip-lead.

('

5.5 COMMON-MODE REJECTION ADJ.

(1)

|8U5!S 8/\BM9U!S

Use a short

Roll

off

d A I I , d aql

8L|1

Set

the

sp /\

Set

both

positions.

clip-lead

switch

to

puo aq 1sn_

Gain switch

output

Q Jo; |o11u0o

input

ground;

01 0033 1sn_pe

to

BNC with

01a2

‘SCI

coupling switches

uou1u1o0)s1ndu!

ZH

to

>‘|d->|d /\ 17 B

connect

connect

4

10

op |aued

01 L191!“/\$

the

wiper

at

_SdO1S uogloag ug wen egp 1n0 e| pmoq lgnrngo a|.|1 pue q 91

•

the

. II.

1uasa1 sg uop, 5 6

the

dc

voltmeter.

UN8

1u01;

HQIIQH ;|‘|

to

QQ17

'z|-|

SECTION V

pun016 .l!8L|1

PROCEDURE

(2)

Set

the

aql 101gu0|/\|

which should

'(|B=>)

is

:|"l

5U!Id"°9

components

in

leadag

A for

connect

that

no compo-

'ado:>so||gos0

aql lsnfpv

9Ll1 198

:lH

to

within

BLI1 19$

:lH

was sg

qloq

1-QGUUOQ

of

switch.

lndlno

9l.|1 1sn[pv

9H1

3!:lCl3DOHd .l.N3INNBl'lV

their

<2)

01

>1 Z

replaced,

'ZH>|

what

(Z)

to

the

Section

m

the

line

is

230

V

(LU

the

(SH

(em) ‘ pug

(ZL)

(ll)

‘ld

within 1

‘[6]’

50

mV.

1:8)

leg

'19)

.

3 pue

the

HF

(9)

Ll

am

(3) P|"°LI'5

198

(Z)

ground

(3) Adjust

the

(4) Monitor the

(5)

1'“ ""“‘

(6) Set both

(7)

(8)

n

(9)

SB

(10) Adjust

(11)

Set

(12) Adjust

(13) Adjust

pue a6e1|o/\

(14) Adjust

p|OL{S LlB[Z)!UL|O€-)1

-oduuoo

(15)

(16) Adjust

eql

(17) Repeat steps

A

OSZ 1°} V ZS/L 1°

asn;

aql ems e>|ew '19/V\OC| aug| 02 u.10J; 5U!1€J9dO aJ0;ag

5.6

(1) Connect the

S1U8UO

(2)

‘paae|de1

(3) Monitor the

l\ NOLLDHS

V-1

LF Rolloff switch

the

front

output

BNC.

'1a1euu1|0/\

is

tion
where oscillation stops.

Connect
and B inputs (common mode).

present, adjust C200

qzng/v\s

aql

40

.l9d!M aql

a 4 V pk-pk

TCIV

input

'31E‘.lC)3B

Set

the

gain switch

'xew /\ ZL '1nd1n0

Set

the

HF

Rolloff switch

Adjust
put,

oscilloscope (still

oscilloscope.

Set

common-mode rejection.

signal generator, and
attenuator

Set
coupling switch
kHz, LF Rolloff switch
to

connected

amplitude. Adjust
400

R118

as

indicated

L|OS '919JnOOE

the

signal generator

the H F Rolloff control

asuodsa1

the

gain

'u0g11o1sgp

Cl05

alepdmdde

the

signal generator

ou 1eq1 sawnsse

the

Model

C1

10:-)uuo:> ueq_|_ '(|eued

8L|l Bugleagpug

GAIN

01

precision rms voltmeter;

load does

08

azgs

aug|

CALIBRATION

to

.l8].8J uogloas sgq1 ug pauogluaw

WOO U!1BOO JO O18 UO

the

113's A

sg

wauodwoa

2 k (cal).

L|9!LW\ luawmlsul

to

Hz.

'su0g1gsod

01 saqalg/v\s

up

output

1oauuo0£punoJ6

1e

OHEIZ

coupling switches

%['Q

(eMR

Aouenbw;

as

/v\o|

’a5ue1 2|-|>|

connected

and

'1U9lUU5[|B Bugmp pue aJ0;aq s>|oaqo |eu6gs

8L|_|_ "e/\g1oa;ep we

113gaintol00.

'1U9LUJ1SU[ 8L|l azg61aua pue

for minimum signal

10

through

J8dOJC| 9L|1 ems

6ug|dn0o

'pea|-dg|o aL|1

to

DC.

Z1)

'(/\W

panel

qlg/v\

9L|l

with

loauuoo

100

/\ O

dc

zero control for 0 V

Q|\|g1nd1n0 aql 101gu0|/\|

the

oscilloscope.

‘VOL 01

u¢>1!~\s we

to

just

01 1401!/v\s

01 pea-9|-d!|o uoqs

Hz

sinewave signal

EIOHHOS ELLVE)

‘[:()[

to

10k.

5ug1eo|;

6

ADJ.) for

by

the

"13 0017

%['Q 'J319lLll|O/\ SUJJ UO!S!O8.ld

necessary

Cl16

c1ac1z|2||\|

aql

empaomd 1uaLuu6g|e

JBGJ

16

U°!1919d° /\ Qll 1°} V 9L/L)

uoglgsod

to

[IQQQZ

pue

‘A|ddns op a|qeg1e/\

to

1 kHz.

minimum

oscilloscope.

|@p<>v\| P1@>1v@d-11@|M@H

to

2 V pk-pk,

"A1!/xglgsuas uua//\Lu

to

300

kHz.

z|_|>|

Q99 '3dOOSO||[OSQ

to

obtain

'JO1BJ9U95

Q09

to

the

for minimum

5U!>|9LLl

to

2 V pk-pk,

luawnnsug

output.

apgsug

several times for

eq pue

up

aql

qloq

lndug

104 LLZH

beyond

DC.

’sJo1enua11v

d I

a display on

output).

J.NElWdlOE|

Aq

S!L|1

uo pa1eo0| ‘u0g1e1ad0

’pasn aq 01

sg qolg/v\s

lag

(L)

anoweg

1‘5"[PV

If

aul

the

;;,o||0H

.LEl:I ZV V9

100

100

a/\e/v\au!g (L)

100

40

300

eql

sgqi :3_|_Q|\|

J8/V\0d

optimum

‘ '

H71’

dc

at

(3)

oscilla-

ws

(zl-

point

e asn (L)

to

the

A

(9)

(g)

Hz

out-

kHz.

(Z)

the

kHz

on

ems

e>|ew

kHz.

ug sluau

eu!|

P9ll91$U!

a6e1|0/\

|8UBC|-188.1

gm

2'9

/\»HVN|W|_|3Hd Z-9

2000: 1 attenuator

6 A - d 6 d

the

.

to

output

the

not

occur

connect

Model 113's A input.

input

coupling switch

I’/\.lB:iS9O9U Gql

GND,

the

e ;| "as!/uas aeu;-a|qno11

to

9|q9!l91 '9|q91$ 9 5!

of

the

signal generator so

that

the

rnis voltage

to

the

output

the

output

s1u!0d1se1

9 lU9UOC|UJOO 9 1

/3911.1 1U9lJJU5||€‘:1.l8I\.8/\/\OL|

HF Rolloff switch

DC,

and

signal generator with

NOl.|.O(]OH.LNl L'9

the

attenuator

would change

to

DC,

set

the

Gain switch

IBPOW

SILL

must

that

a change

the

to

1 V (exactly) @

of

the

of

the

olou

1|nO.l!O

the

to

300

the

remain

signal

.HA

pue

B

a/\g6

QLLL

of

oe

(4) Connect

(4)

Connect

outputjack.

output

(5)

Adjust R221 for exactly

(5)

Adjust

step (3). NOTE: This

step

in

in

5.7

LOW

5'7 LOW

the

the

jack.

R221 for exactlv

(3). NOTE: This

2 k,

the

the

5

2 k, 5 k, and

FREQUENCY ROLLOFF

Flag?/|l;EmgXT|::0§LOFF

COMPENSATION

(1) Set the

(1)

Set

Rolloff

Rolloff

Connect

(2)

Connect

(2)

and connect

and

A

A

HF

the

input.

input.

Rolloff

HF Rolloff

to DC.

to

DC.

the signal generator

the

connect

the attenuator

signal

the

precision

precision rms

k,

and

rms voltmeter

adjustment trims

adjustment

k positions

10

10

k positions

control

control

generator

attenuator

voltmeter

the

same

the

same reading

O

to

100

to

100

to the

to

output to the Model

output

to the

to

reading

the gain

trims

the

the Gain switch.

of

of

the

Gain switch.

kHz, and

kHz, and

10:1 attenuator,

the

10: 1 attenuator,

to

the

Model 113'5

113's (2)

the

113'5

as set

in

as

set

only

gain only

set the

set

the

113's

LF

LF

in

Set the II3'S

Set

the

(2)

coupling switch to GND,

coupling switch

kHz, the LF

kHz,

switch to

switch

(3) Monitor the

(3) Monitor the

precision rms voltmeter; the

precision rms

connected

connected

load

load does

amplitude. Adjust

amplitude.

300

300

(4)

Connect

Connect

(4)

113's

113's

(5) Adjust

(5)

Adjust

voltmeter

voltmeter

113'5 A

the

LF Rolloff switch

10 (cal).

to

10

does

kHz.

kHz.

the precision

the

output jack.

output

C26 (en the |_||: Reueff

C26 (on

reading

input

A

input

to

Rolloff

(cal).

output

output

voltmeter;

signal generator

to the

to

the signal

not

occur that

not

occur

Adjust

precision rms

jack.

the

reading

of 0.707

of

the_rms

coupling switch

COUPIIDQ

the HF

GND,

the

switch to

of the signal

of

the

the

generator

that

the.rms

rms

HF Rolloff switch)

0.707

SWITCII t0

Rolloff

HF Rolloff switch

DC, and set the

to

DC, and set

signal

attenuator must remain

attenuator

would

would

voltage

voltage

voltmeter

voltmeter

SW;-(eh) to preduee

V

rms.

V rms.

to

DC,

the

DC, the B

to

switch

to

the

generator

generator

so that

so

that

change the signal

change

to 1 V

to

with the

with

must

remain

change of

a

a change

the

signal

(exactly)

1 V (exactly) @

the

to

produce

Model

Model

to the

to

B

300

300

Gain \

Gain

the

of

@

e

a

\

I

(3) Set the A coupling

(3)

Set

the

A coupling switch

switch

to GND,

switch

to

GND, and

(4)

Monitor

(4)

Monitor

voltmeter.

voltmeter.

(5) Adjust the

(5)

Adjust

V rms

V rms

(6) Set the

Set

(6)

(7) Adjust

(7)

Adjust

reading

reading as

HIGH

5.8

5.8 HIGH FREQUENCY ROLLOFF

Connect

(1)

(1)

Connect

signal generator,

signal generator, and

attenuator

attenuator

the 113's

the

signal generator

the

signal

@

kHz.

10

@ 10 kHz.

|_F Rollgff control

the

LF

Rolloff

C200 to obtain exactly

C200

as in step

in

step

FREQUENCY

COMPENSATION

COMPENSATION

the

10:1,

the

10: 1

to the Model

to

the

switch

the gain

and

the

gain switch

output with

113's

output

generator

control

to

obtain

(5) above.

(5) above.

attenuator to the

attenuator

and

connect

connect

113's

Model

113's

to

DC,

to

DC, the B coupling

switch

to 10.

to

the precision rms

with

the

to produce a reading of 1

to

produce

to 1 kHz_

to

1 kHz.

exactly

the

the same voltage

ROLLOFF

to

the

the

the

input.

A

A input.

B

the

coupling

10.

precision rms

a reading

voltage

same

output

output

output

output

of the

of

of

of

of

the

the

the

5.9 BATTERY TEST

5'9 BATTERY

(1) Set the

(1)

Set

the

the BATTERY

the

BATTE

"—".

"-".

center (off)

the

center

the

1

shorted

shorted

(2)

Connect

(2)

Connect

supply

supply

Connect the positive

(3)

(3)

Connect
#37

of

#37 of the PC board‘

(4)

Slowly

(4) Slowly

Comesm

comes

CAUTION:

CAUTION: DO NOT EXCEED

(5)

necessary,

If

(5) If necessary, adjust R309 until

11 V (i0.1 V) dc.

at

at

11

below 10.7 V dc.

below 10.7 V dc.

CALIBRATE

TEST CALIBRATE

Power

switch to

Power switch

If the BATTERY

If

out

out.

to

to

the

adjust the

adjust

on.

V (±0.1

-|-EST tOgg|e

RY

TEST

the

BATTERY

position, the

(off) position, the

negative terminal of

the

the

negative terminal

brown lead of the

the

the

brown

lead

the

positive lead

PC

board.

supply

the

supply

DO NOT

R309 until the test lamp comes on

adjust

V)

dc.

(pushbutton

OFF

to

OFF

(pushbutton

switch to either ~+~

toggle switch

TEST

toggle

TEST

toggle switch

external supply

external

of

Battery Test lamp.

of

the

Battery

lead

to the point

to

EXCEED

The

The

supply

of the

of

the

supply

the

point

V

13

13

V DC.

the

test

lamp should not come

lamp

should

OUT)

OUT) and

to

either

is left in

switch

the variable

the

DC.

is

supply will be

variable

Test

lamp.

to terminal

to

term

the lamp

where

where

the

lamp

comes

not

come

and

"+"

left

will be

dc

inal

lamp

on

or

or

in

dc

on
on

SECTION VI SAFETY

WARNING!

WARNING! POTENTIALLY LETHAL VOLTAGES

VICE

INSTRUCTIONS

VICE INSTRUCTIONS

DO NOT PERFORM

DO

NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED

TIONS

TIONS UNLESS

apparatus

apparatus under voltage shall

by

a skilled person

by

a skilled person who is aware

source,

source, terminals may

The

apparatus

The apparatus shall be disconnected from all voltage sources before

maintenance,

maintenance, or repair. Note that capaCitors inside the apparatus may still

paratus

paratus has been disconnected from all voltage sources. Service personnel are thus advised to wait

several

several minutes after unplugging the instrument before assuming that all capacitors are discharged. If

any

fuses

any fuses are replaced, be sure to replace them with fuses

same

the

the same type. The use

POTENTIALLY

UNLESS

under

terminals

or

been

has

minutes

are replaced,

type.

LETHAL

ARE FOR

ARE

FOR

ANY SERVICING

YOU ARE

YOU

voltage

may be

shall be

repair. Note

QUALIFIED TO

ARE

QUALIFIED

shall be avoided as far as

who

be

be

is aware

live, and

live, and the opening

disconnected from all

that capacitors inside

disconnected from all

after

unplugging

The use

be sure

of

of

to replace

makeshift

makeshift fuses and the short-circuiting

VOLTAGES

BY

USE

USE

BY

OTHER THAN THAT

TO

avoided

the hazard

of

of

the hazard involved. When the apparatus is connected to a power

the

opening of

instrument

the

fuses and

SECTION

VI

SAFETY NOTICE

ARE PRESENT

ARE

PRESENT INSIDE THIS APPARATUS. THESE

QUALIFIED

QUALIFIED PERSONNEL ONLY.

TO

SO.

TO

SO.

as

far

PERSONNEL

Any

adjustment,

Any adjustment, maintenance and repair

possible

as

possible and,

involved. When

covers

of

covers or removal

voltage

the

voltage

sources. Service

before

with

them

fuses

short-circuiting

the

V-2

V-2

NOTICE

INSIDE

ONLY.

CONTAINED IN

maintenance

if

and,

removal

or

sources before

apparatus

assuming

of

of

unavoidable,

if

unavoidable, shall

apparatus is

the

of

of

may

personnel are thus advised to

that

same current

the

the same current and voltage rating and

of

of

THIS APPARATUS.

TO

AVOID ELECTRIC

TO

AVOID ELECTRIC SHOCK,

THE OPERATING

IN

THE OPERATING INSTRUC·

and

repair

shall be carried

connected

parts

parts is likely

it is opened for

it

fuse

fuse holders are prohibited.

likely

is

to expose

to

is opened for any adjustment,

still

be charged

be

charged even

capacitors are discharged. If

all

voltage

and

holders are prohibited.

THESE SER-

SHOCK,

INSTRUC-

of

of

the opened

the opened

be

carried out only

out

to a power

expose live parts.

live parts.

any adjustment,

even if the ap-

if

rating

SER·

only

the ap·

wait

of

and

of

9|\||>|9|M;\g '|v/\Q|/\|33

(

' /

F -—

6.1

INTRODUCTION

Although
troubleshooting
in
to
any
Appl ied Research
merits
returning
instrument
important
contacted
so

the

Model

may

this

section

a specific

will be helpful.

‘

circuit

troubleshooting,

Corporation

of

repairing

it

to

prior

inval

is

that

idate

the
still in

aq1,\0

an

aql

to

attempting

the

aql Bug/\ea| ’>|:>!/v\ aql dn
eql

ug1ep|os

01 1ug0[

aq

uo U01! 5U!J9p|OS

do1

could

r,

-

|

--

Q

-It-7-‘P?

u

--

/

113

is

a reliable

be

necessary;

or

component,

the

user

the

instrument

factory

WARRANTY,

lsow

authorized

a/\oqe

loq 9 a0e|d

Warranty.

_

_

Once

for

/\|>|0gnb /v\0|; pue 1|aw ||g/v\

’spu00es M9}

/\|10eJgp

a field repair,

6.2 PROCEDURE

ue asn saouelswnznga ou

/v\0|;

01

To

speed

9L|1

external

889C]-Ll!SOJ

when

saqaug Ma; e

set-up

V|_|d"|V)

be helpful in

4Q Alddng Q ’(1u9||9QX3

Circuit

um! 5ug1ap|0s

schematics

sgql

mation
supply

uu0J;1ap|os ua1|0w

10

by

comparing
signal
stages
checks
doing
bad

transistor

aql

am asn

collector

to

remember

a\.|1 mum;

biased silicon

40

aloq am

V,

and

less

than

pue spea|

emitter).

eq

01 a|qgssod

When

s1! ;0

Speal LIMA luauodwoo

is

completed,

of

the

a|gL|/v\

ment

asou-6u0|

am won eloq am qnojul

6.3 PRINTED CIRCUIT SOLDERING

1ap|os

e>|e_|_

If

any

Jeplos am

board

eql allsoddo

not

to

paeomd

requires

ems am

be used

SNVLM

use

of a vacuum

-po1.u,10

other

:|;|()-H3Q|"|()S

A brief
METHOD

Removing

process.

xn|; aql ;0 awos Bu!/v\o||e ‘peuap osun

the

troubleshooting

dO1

40

causes

the

amplifier

and

procedure

Description,

for

Aq pa/\agq0e aq ueo >|1o/v\ ueap A||eu0g1de:>x3

Voltages,

a1!/v\ pepue11s;0 q16ua| e sasn

checks

or

to

can

resistance

mum;

junctions.

qsea 10;sgq1

that

the

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amplifier

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eql 1a1;V

'a|oq pue

components

for

inspection

damage

considerable
to

the

use

description

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of

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eql o1ug

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together

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isolating

the

VII),

the

two

output

isolate

the

the

overload

then

specifically

checks,

by

checking

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that

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sea; sg luauodwoo

transistor

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the

collector

base voltage

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1ou

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a/xeq

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probably

trim-components.

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should

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ped sq),

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symptoms.

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with

should

trouble.

ampl ifier stages

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aql dn

signals against

trouble

circuit,

pinpoint

it

is

sometimes

the

diode

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base-to-emitter

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diode

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voltage

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auo

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aql ‘sa|oq

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and

replacement

e 1e auo

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be necessary

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replacement,

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solder

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operated

p006

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required

equipment

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SECTION

TROUBLESHOOTING

____

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instrument,

the

procedures

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problem

or

before

should

for

contact

advice

himself, as

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repair.

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it

factory

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to

one

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possible

action

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voltage

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with

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from a printed-circuit

be especially careful

components

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occasional

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isolated

‘,0

attempting

§

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13,3

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the

relative

opposed

40

aaJ;ee1e

any

case, if

is

particularly

e

u!L|1!/\/\

representative be

as

to

uaq_|_ '><n|; 6ug1ap|os

10

and

Section

Section

'pa1ap|osun

failure

ug u/v\oqs

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the

symptoms

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power

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resistance

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transistor

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power

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unsoldered,

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solder

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lead

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free,

continue

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one

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holes,

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pad

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the

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to

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in

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the

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VI-'

Figure

VI-l.

SOLDER

REMOVAL

BY

WICKING

32

V

aq

;|

Q

4°

9!

D

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J

Lift the soldering

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the

freezes

freezes

(generally

(generally

Inspect

ineleeet

procedure

Preeedufe

the

the

hole. Components

hole.

at

at a time,

be removed

be

“rocking"

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as

the

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to

to

the

The

solder

solder

Components

time,

a

removed

far

possible,

as

far

as possible,

leads until

leads

soldering

the joint.

the

joint.

about

about

joint.

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as

required.

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the

in

in

the

such as

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by

by

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the

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until

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off the

Cut

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% inch

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as

applying

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off

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enV

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ii

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hole molten,

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leads

with

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transistors

transistors

heat

heat

to

to

successively

component

component

remove

remove

the

be

be

Seidei

solder

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while

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which

and

and

pull

pull

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is

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“filled"

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removed).

remains.

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pull the lead

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cannot

trimpotentiometers,

trimpotentiometers,

to one

to

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through

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repeat

heat Te

heat

to

through

through

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the

each

for

for

each

board.

board.

it the

it

wick

wick

component

the

component

clear

ly

ly clear

all

all

solder

solder

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the

keel)

keep

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the

one

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hole

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60/40

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necessary

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make

the

the component;

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to

they

foil

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to

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been

from

removed,

removed,

the

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has been

has

from

COMPQNENTS

COMPONENTS

component

the

the

component

leads are

the

sure

sure

the

leads are

angle in or out. If they do not pass

don't

angle in

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the

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component;

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than

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a

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then

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to apply

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apply

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to complete-

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grade

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the

the

pass

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the

after

after

rosin

rosin

than

than

t,‘

M

s

l

‘\

l

VI-2

VI-2

+---uni

i

Schematics, Table

Components Location Oiagram

and

Block

Oifferential Preamplifier Schematic (4332-0·S0,

Output

Power Supply

Wiring Oiagram (4340·0·S0)

Amplifier

of

Schematic (4332-0·S0, sheet

and

Battery Test Circuit (4332-0·S0, sheet 3)

lrll/\

SECTION

VII

SCHEMATICS

sheet')

2)

. . .

Page

VII·'

VII-2

V

11-3

V

11-4

VII-5

VII-6

1

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APPENDIX A

INSTALLATION INSTRUCTIONS FOR

DUAL RACK·MOUNTING KIT (1715·0008)

(1)

Set the

side.

(2)

Remove the top cover
is secured by a single screw located on the
under surface

cover. This screw is most easily removed by

using a long screwdriver (or
short one). Once the screw has been remov­ed,
be

(3)

Remove the bottom cover
bottom
secure the
screws are removed, the feet can be removed
and the cover slid back and freed from the
unit.

(4)

From the sides that
mounting, remove the side decorative plate

(secured by

's;eJedss ||;/v\

These will

‘ps/\ouJs1

e u;ews1 ||;/v\

sm s;usu1n1;su; |enp;/qpu;

shim plates exposed when the decorative
plates are removed.

-;oq pus do; sq; se 6uo| sv'>1os1

/(us

u;

ps;unou1 sq uso A|qu1ssss s;q1_ 'A|q 1s;;e ;usoe[pe

-wssse s|6u;s

MOU uso

Bupnoss ‘s1s/\oo do; pus u.|o;;oq sq; ||s;su;s;;| (5)

111011

9111

95119119111.'191|19501$1119111"1191l! 9111101991

9!

9111098 01

9111

two

Model 113's on a bench side by

of

both units. The cover

of

the lip at the rear

an

extraordinarily

simply

lifted

slide the cover back to where

free

of

the unit.

of

both units. The

cover is held by the screws that

two

rear rubber feet. When these

will

be adjacent after

two

screws) and the side panel.

s;usu1n1;su; o/v\; sq;

not

s1e s1s/\oo sq; ;| "Mqwssse

be replaced. Do not remove the

s;usu1n1;su;

o/v\;

sq;

s|6u;s

‘smoss

sq; ;o s1s/\oo wo; '|susd spgs sq;

“5; p.1B|DUB1S s;e|d

se"ps|pueq

e

s;usum1;su;

/111311119999

9511911

o/v\;

0111!

9111

5111111110111

dn ps>|o;d

pus

sqi "A|qu1ssse

P91191111

1991 9111

/111111119

//veaos

‘Z-)N|‘|dO()

of

the top

EDNLLNHOW

it

sq

sq;

"1991

1199111

(8)

sN|>1oo1

.LNOH=l

ElE)NV'|:|

1:1‘v’\E|H

can

s/q;s1oosp

sq;s/\ows1;ou

sq; u1o1;pssq pus

ps/\ows1

sssq; usq/V;

;eq;

9L|j_

(5)

Using the
secure the front

two

Allen head screws provided,

coupling

to

one

of

the units.

The shim plate exposed when the decorative

strip was removed should be under the cou­pling.

(6)

As shown in the photograph, install the lock­ing screw in the
to

retain the shim.

(7)

Lock the front
sliding the head

other

instrument, taking care

of

the

two

units

of

the locking screw

together

into

coupling slot.

(8)

Insert the rear mounting flange
rear

of

the instruments together. The flange is

simply

pushed

into

the assembly from the

to

secure the

rear.

(9)

Reinstall the
the assembly. The

bottom

and top covers, securing

two

instruments

can now
be picked up and handled. as a single assem­bly. This assembly can be mounted in any
standard 19" rack. As long as the top and bot­tom covers
secure, the

sq;

single assembly. If the covers are removed,
the

two

s/q;e1oosp spgs

sq uso ;ss;

s/v\s1os

's;;un

q;oq

of

the individual

two

usq/v\ pssodxs

oq 'p9OQ|d9J

instruments

pus

‘D9/\OllJ8.l

instruments

sq ;ou

(s/v\s1os o/v\;

sq; GAOUJGJ ‘6u;;unou.1

||;/v\ ;sq;

sq

>|osq pqs 1s/\oo sq;

sq;

sspgs sq;

‘ps/\ou1s1 sns s/v\s1os

';ss; Jsqqm ms; o/v\;

Aq

sq;

p|sq s; 1s/\oo u1o;;oq

1s/\oo wo;;oq

;o

instruments

ss;e|d

s1s

will

||;/v\

will

psmoss)

LU!l.|S

sssqi

separate.

UJOJ;-|

-Hun

ss;s|d

Aq

sq; smoss

s/\ou1s;;| (9)

sq;

remain a

pus

(11)

by

the

are

J1

3,

I

1

1

91l10111!MsJos511!>19°l

/111 191119501

511!>191

9199

'>190l 9111 1191911!

-nos

sq; JGDUH

s/q;e1oosp

's;;un

‘pspg/\o1d

sq;

c

6u;|dnoo

';o|s

$1111"

0/V11 9111

‘111911111$11!

1199150101111

p|noqs

sq

usq/v\ pssodxs

sq;

911110 P9911

10

1111119

191110 911111! M9199

ps/\ou1s1

111011

9111

s;s|d

9111511113119

9111

1119191 01

9111

11!

11/1119119 SV

~

ss/v\

uqqs sq_|_

>190‘!

511!

'511!|d

d;1;s

;o suo o; 5U!|dOOJ,UO.l}8L|19Jl'109S

s/v\s1os pssq us||v o/v\; sq;

(8000'9LLL)

E:lO:l

Bugsn

.l.|)l '9N|.LNOlN')lOVH

SNO|.LI)HJ.SN|

s1sq/v\

(L)

MOUNTING

(9)

FLANGE

FRONT COUPLING

ueo;;

-/\ou1s1 ussq

R R

A|;1eu;p1osJ;xs us

ps/\ows1

Aq

do; sq;

uo ps;soo|

sq;

JGAOO

;o ms; sq;

sq_|_

LOCKING SCREW

(9)

Aq

qousq e uo s;9;;

spgs

NOl.LVT|VJ.SN|

X|(]NElddV

V

o;>;osq

seq

/(uses

's;;un

';;un

sq; ;o ssq

.19/\OO sq;sp;|s

MGJOS sq; souQ

Js/\;1p/v\s1os

.10)

s; /v\s1os s;q_|_

;sou1

sq; ;o sospns

;e d;|

q;oq

s|6u;s

;o JGAOQ

MGJOS

|spow

'lV(]

1

ps;;;|

A|du1;s

"(suo ;1oqs

e 6u;sn

6uo|

Aq psmoss s;

e

om;

s/\ou1s;;|

sq;

do; sq;

sq

‘ps

us/\oo

JGDUI1

(3)

'sp;s

;s3 (L)

:s:

o

o

m

r-

w

r-

o

~

z

o

en

_<_OUm_|‘___w_|O<<|ZO___wm

m

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152

91-A-MNL-A 4200-0019

9

1

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