ESI 250DE Manuel utilisateur

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BRIDGES

AND

@

e|sii,

—

Electro

Scientific

industries

13900

N.W,

SCIENCE

PARK

DRIVE

+

PORTLAND,

OREGON

97229

APRIL

1967

REPLACES

JUNE 1966

MODEL

250DE

ithactim

Monual

UNIVERSAL

IMPEDANCE

BRIDGE

AC

|

INT

‘DC

EXT

1

o

GEN

GEN

|

IkHs

\

BAT

TEST)

GEN

DET

IMPEDANCE

BRIDGE

250DE

wow

FO

SC

ems

oe

'

AMD

O@lcan vasa

SERIAL

NUMBER:

PART

NUMBER:

13202

Ohoaye

ght

1966 1967

Electra

Se

eatte

Inducer pe

The

following

table

lists

the

most

recent

revision

of

each

page

at

the

present

printing:

PAGES

DATE

Title

4/67

A

4/67

i

and

ii

6/66

1-1

6/66

1-2

4/67

1-3

6/66

2-1

thru

2-3

6/66

3-1

thru

3-5

6/66

4-]

thru

4-5

6/66

4-6

4/67

4-7

thru

4-10

6/66

5-1

thru

5-12

6/66

6-1

thru

6=7

6/66

7-0

thru

7-2

4/67

A

eisii

250DE

4/67

Vv,

IV,

TABLE

OF

CONTENTS

.

INTRODUCTION

1.1

DESCRIPTION

1.2

SPECIFICATIONS

OPERATION

2.1

CONTROLS

2.2

CONNECTIONS

2.3

BASIC

OPERATION

RESISTANCE

MEASUREMENT

3.1

DC

RESISTANCE

MEASUREMENT

3.2

AC

RESISTANCE

MEASUREMENT

3.3

NOTES

ON

RESISTANCE

MEASUREMENT

3.3.1

Low

Resistance

3.3.2

High

Resistance

>

PACITANCE

MEASUREMENT

NORMAL

CAPACITANCE

MEASUREMENT

CAPACITANCE

MEASUREMENT

WITH

EXTENDED

D

RANGE

CAPACITANCE

MEASUREMENT

USING

DC

BIAS

4.3.1

DC

Bias

Supply

4.3.2

Operating

Procedure

VOLTAGE

ACROSS

UNKNOWN

CAPACITOR

NOTES

ON

CAPACITANCE

MEASUREMENT

4.5.1

Series

and

Parallel

Capacitance

4.5.2

Low

Capacitance

Measurements

4.5.3

High

Capacitance

Measurements

INDUCTION

MEASUREMENT

5.1

NORMAL

INDUCTANCE

MEASUREMENTS

5.2

INDUCTANCE MEASUREMENT

WITH

EXTENDED

Q

RANGE

5.2.1

Preliminary

Procedure

5.2.2

Parallel

Inductance

5.2.3

Series

Inductance

5.3.

INDUCTANCE

MEASUREMENT

USING

DC

5.3.1

DC

Supply

5.3.2

Operating

Procedure

VOLTAGE

AND

CURRENT

IN

UNKNOWN

INDUCTOR

5.4.1

Voltage

5.4.2

Current

5.5

Cc

4

A

4

WOnNn-

ha

ie

5.4

OTES

ON

INDUCTANCE

MEASUREMENT

5.1

Series

and

Parallel

Inductance

§.5,.2

Low-Jnductance

Measurements

5.5.3

High-Inductance Measurements

5.5

USEFUL

MEASUREMENT

TECHNIQUES

6.1

EXTERNAL

DETECTOR

6.2

EXTERNAL

DC

GENERATOR

6.3

EXTERNAL

AC

GENERATOR

6.4

OPERATION

AT

FREQUENCIES

OTHER

THAN

ONE

KILOHERTZ

6.4.1

D

and

Q

Corrections

6.4.2

Accuracy

6.5

SLIDING

BALANCE

6.6

EXTEND

LEADS

WITH

AC

MEASUREMENTS

VII.

REPLACEMENT

PARTS

The

following

are

registered

trademarks

of

Electro

Scientific

Industries,

Inc.:

ESI®

Electro

Scientific

Industries,

Inc.

ESIAC®

Algebraic

Computer

ESIPOT®

Potentiometer

DEKABOX®

Decade

Resistors

and

Capacitors

DEKABRIDGE®

Bridge

Circuit

DEKADIAL®

Decade

Dials

DEKAMATIC®

Automatic

Unit

DEKAPOT®

Decade

Potentiometers

DEKASTAT®

Decade

Rheostat

DEKAPACITOR®

Decade

Capacitor

DEKAVIDER®

Decade

Voltage

Divider

KELVIN

KLIPS®

Four-terminaf

Clips

KELVIN

KLAMPS®

Four-terminal

Clamps

PORTAMETRIC®

Portable

Measuring

Instrument

PYB®

Potentiometric

Voltmeter

Bridge

Application

for

registration

has

been

filed

for

the

following:

DEKATRAN

Decade

Transformer

ii

elsii

250DE

6/66

SECTION

I

INTRODUCTION

1.1

DESCRIPTION

The

esi®

Model 250DE

Impedance

Bridge

is

an

instrument

that

measures

resistance,

inductance,

capacitance,

and

the

dissipation

factor

(D)

and

the

storage

factor

(Q)

of

inductorsand

capacitors.

The

instrument

is

battery

operated

and

completely

portable.

An

internal

generator

supplies

ac

and

dc,

and

an

internal

solid-state

ac-de

detector

indicates

bridge

balance.

Figure

1-1

is

a

simplified

schematic

diagram

of

the

instrument

in

each

of

the

four

modes

of

operation:

resistance,

capacitance,

and

series

and

parallel

inductance.

R

UNK'

RESISTOR

UNKNOWN

CAPACITOR

Viv

SERIES

%

§

oO

3

2

pom

3?

oo

RESISTOR

LR

DEKASTAT®

DECACE

BHEQSIAT

L-R-C

DEKASTAT®

DECADE

SHEGSTAT

ond

bia

ete

othis

eee

—

STANDARD

CAPACITOR

va

G

RHEOSTAT

o—_tiah

Figure

1-1.

Simplified

Schematic

Diagrams

b-R-C

DEKASTAT®

DECADE

Ret

OStAT

U-R-C

OEKASTAT®

DECADE

AHEOSTAT

Q

RHEOSTAT

©

1.2

SPECIFICATIONS

Detector:

A

solid-state

ac-dc-amplifier

null

detector

AC

Characteristics:

Input

Impedance:

Approximately

1MQ

Sensitivity:

Continuously

variable,

10

V

minimum

detectable

signal

Frequency:

1kHz

(kilocycle)

DC

Characteristics:

Input

Resistance:

Approximately

1MQ

Sensitivity:

Continuously

variable

to

1

millivolt

full

scale,

20

microvolts

minimum

detectable

signal.

Generator:

A

solid

state

ac

generator

with

transformer

output

and

diode

rectifiers

rdc.

AC

Characteristics:

Open-Circuit

Voltage:

2V

rms

Short-Circuit

Current:

70

mA

DC

Characteristics:

Open-Circuit

Voltage:

3V

Short-Circuit

Current:

40

mA

Supply

Power:

Four

1.5-volt

size

D

cells

Battery

Life:

Approximately

500

hours

FUNCTION

RANGES

ACCURACY

MAGNITUDE

D0

ORQ

RANGES

MAGNITUDE

oona

Resistance

G@t2

Main

eight

‘RUSE

tangea,

0

1

mO

per

eight

dal

division

on

ranges

01%

+

1

dial

division

lowest

R

range

Inductance

0-1200

H

tn

seven

Q=—0to105

014

(Series)

ranges

O1uH

per per

dial

division

dial

division

on

@

03%

+1

ox

{

division

|

0.040

(1

+

Q*)

Highest

+4

1/Q

+

0020

dial

eX

lowest

L

range

Other

03%

+

1

deal

division

|

0.005

(t

+

Q2)

five +

05%

*

1/0

+0020

93%

+1

set

division

|

0

040

(1

+

QO)

Lowest

|

"4

'40%

x

1/0

0020

Inductance

-1200

H

in

seven

Q

=

10

to

1000,

Highest

03%

+1d

eet

giviaton

0640

(1

+

D%

(Parallei)

ranges

O1uH

per

scale

reads

@

dial

9

+

40%

x

+

0020

dial

diviston

on

1g

hinear

in

1/Q

towest

L

range

Other

03%

+

1

dial

division

|

0005

(1 |

0D}

five

+

05%

x

1/0

+

0020

0.3%

+

1

dial

division

|

0040

(1

+

D3}

Lowest

+

40%

x

1/0 +

0020

Capacitance

0-1200.F

inseven

O-=

610105

in

two

Highest

02%

+ 1dial

division

|

0040

(1

+

DB?)

(Serves)

canges

O1pF

per

ranges,

0

004

per

a

+

40%

x0

+0

02D

dial

divigion

on

dial

division

on

towes!

C

range

lowest

D

range

Other

02%

+

1

dial

division

|0005(1

|

D?}

five

+05%

xD

+

0020

02%

+

1

dial

division

|

0040

(1

+

Dy

howest

|“

"+

40%

x 6

+

902D

els|i

250DE

4/67

R

ACCURACY

CANO

C

ACCURACY

mh

ft

at

n*

NH

Pa)

UNKNOWN

RESISTANCE

UNKNOWN

CAPACITANCE

OR

INDUC

TANCE

The

specified

accuracy

for

measurements

of

resistors,

Low-loss

inductors

and

capacitors.

ol

The

specified

accuracy

for

measurements

of

D

and

Q,

9.01

ooo

D

(OR

Q}

ACCURACY

IN

0

{OR

Q)

UNITS

°

o

106

0

{OR

Q}

Q

CIAL

READING

The

accuracy

of

inductance

and

capacitance

measurements

is

influenced

by

the

D

and

Q

value.

This

curve

shows

the

accuracy

to

be

expected

at

various

D

and

Q

values.

2

L

AND

C

ACCURACY

Figure

1-2.

SECTION

il

OPERATION

The

controls

and

connections

necessary

to

operate

the

Model

250DE

Impedance

Bridge

are

shown

in

Figure

2-1,

oo

oO

1

GEN

2

1

MAS

2

AC

DET

IAC

EXT]

INT

GEN

|

thHs

GEN

ORT

DET

Gain

IMPEDANCE

BRIDGE

250DE

creo

siti

a6

6

ero

POCIyaAmMO

GriGon

Figure

2-1.

Mode!

250DE

Panel

View

2.1

CONTROLS

FUNCTION

switch

selects

the

type

of

bridge

circuit

that

will

measure

resistance,

capacitance,

or

inductance.

RANGE

switch

selects

the

multiplier

for

each

function.

L-R-C

decade

dials

are

a

DEKASTAT®

Decade

Resistor

that

is

the

main

balancing

element

of

the

bridge,

The

setting

of

the

dials after

the

bridge

is

balanced

indicates

the

value

of

the

inductance,

resistance,

or

capacitance,

D-Q

dial

is

used

to

balance

the

phase

of

the

capacitance

or

inductance

bridge,

The

setting

of

the

dial

ye

the

bridge

is

balanced

indicates

the

value

of

dissipation

factor

(D)

or

storage

factor

(Q),

GEN-DET

switch

selects

bridge

generator

and

detector

connections,

ac

or

dc,

intemal

orexternal

generator,

The

switch

also

connects

the

internal

batteries

to

the

battery

test

circuit,

DET

GAIN

control

adjusts

the

sensitivity

of

the

ac-dc

detector

and

turns

on

power

to

the

generator.

2.2

CONNECTIONS

R,

L,

and

C

terminals

1,

2,

and

3

are

used

to

connect

unknown

resistors,

inductors,

and

capacitors

to

the

bridge.

Resistors

and

inductors

are

connected

between

terminals

1

and

2,

capacitors

between

terminals

2

and

3,

EXT

BIAS

terminals

are

normally

connected

with

a

shorting

lug.

They

allow

insertion

of

a

de

voltage

or

current

to

bias

capacitors

or

inductors.

EXT

GEN

terminals

provide

a

connecfion

to

the

bridge

for

an

external

generator.

When

the

GEN-DET

switch

is

in

the

EXT

AC

GEN

position,

the

terminals

connect

to

an

isolation

transformer

so

that

a

grounded

external

generator

can

be

used.

When

the

GEN-DET

switch

is

in

the

EXT

DC

GEN

position,

the

terminals

connect

directly

to

the

bridge.

EXT

D-Q

terminals

are

normally

connected

with

a

shorting

lug.

They

allow

an

external

rheostat

to

extend

the

range

of

the

D-Q

dial,

EXT DET

connector

is

a

BNC

coaxial

socket

that

allows

an

external

detector

to

be

used

with

the

instrument.

It

is

connected

to

the

bridge

at

all

times,

2.3

BASIC

OPERATION

Simple

operating

instructions

are

inside

the

instrument

lid,

Figure

2-2

is

a

reproduction

of

these

instructions.

2-2

elslii

250DE

4/44

_

-~-NX

een

oh

i

a

OC

RESISTANCE

MEASUREMENTS

Torn

O£T

GAIN

control

to

2

Set

FUNCTION

switch

90

Ral

of

Bx

tO.

Set

L-R-C

decade

dials

be

3.000.

Conne<i

the

uninewn

roaistor

to

R-k

terminols

t

ond

2

Set

GEN-O8T

ewitch

te

INT

OC

Adjwst

RANGE

switch

fer

mininum

datecter

deflection

Adjver

u

fd

decode

diets

ter

et

turning

DET

GAIN

conrad

|.

The

measvred

resistence

is

the

seamen

of

the

‘ba

-C

decade

dial

setting

times

the

RANGE

ond

FUNCTION

awiith

settings

CAPACITANCE

MEASUREMENTS

Turn

DET

GAIN

contre!

to

|

Set

FUNCTION

switch

ts

C,

0x0.)

of

Ox

O.00

SERIES

Set

L-R-C

decode

diats

te

3.000 ond

D-Q

dial

te

O

Connect

the

unknown

capaciter

te

C

herminats

2

and

3

Set

GEN-DET

awitch

to

INT

|

hits,

.

Adjest

RANGE

SWITCH

for

minke

dafecter

deflection

Adjwat

1-R-€

decade

dialt

ord

D-Q

dial

alternately

for

minimum

moter

deilecthen,

tuning

OT

GAIN

contre)

clockwise

te

Increase

sensitivity

an

nacessory

Tha

measured

capacitance

jn

the

product

of

the

L-R-C

darede

dial

setting

The

measured

distipation

facter

1D}

ip

the

product

of

the

D-Q

setting

times

Phe

FUNCTION

SWITCH

setting

INDUCTANCE

MEASUREMENTS

Tem

O€T

GAIN

central

te

}

Set

FUNCTION

switch

te

L

PARALLEL

HO

is

grecter

then

30,

te

L

SERIES

of

©

ie

tose

then

10.

Ser

L-8-€

decade

dinkt

te

3.000

und

0-Q

dial

te

maximum

Connec!

the

unknown

inducter

te

8-L

terminets

|

and

2

Set

GEN-OET

switch

te

INT

1

hid.

Adpest

RANGE

twitch

Fer

minimern

detector

detiecion

Adjvit

L-R-C

decade

diels

ond

D-0

die)

oltemetely

far

minl-

mum

meter

deflection,

twrnng

DET

GAIN

contral

clechwite

te

merease

sensitivity

oe:

necessary

The

moweurad

Inductance

la

the

product

wf

the

L-9-C

decode

dial

setting

Himes

the

RANGE

ewitch

setting

The

messured

steroge

focter

{Q)

ja

read

directiy

from

the

0-G

dial,

Inner

sale

fer

parallel

end

evter

wale

fer

sarias

in-

ductence

A

RUMSTON

L.R-¢

xO

oettiferee’

ah

OECADE

RHEOSTAI

fo

STANDARD

RESISTOR

STANDARO

CAPACHOR

9

%

t-@-¢

Nie

DECADE

GHEOSTAT

Figure

BATTERY

REPLACEMENT

Check

the

battery

befure

each

day's

seperation

Turn

DET

GAIN

central

te

?

and

set

GEN-DET

switch

be

BAT

TEST

ff

the

meter

deliects

beyend

the

BAT

OK

merk,

the

bottery

1s

goed.

Tha

bettery

consists

of

four

|

S-velt

D

cella

Ta

change

battery,

remeve

cover

from

battery

cempartment

using

a

serowdriver

Replece

celle

os

shown

In

Hlytteotion

L

a

UNKNOWN

INDUCTOR

PARALLEL

wa

STANDARD

Carhacitoe

Q

RHEOSTAT

tas

15

9200

2-2.

Operating

Instructions

oie?

L-A-€

pexastat®

©

*

OECADE

RHEOSTAT

we

CAPACITOR

a

ee

©

RMeOstAt

of

104

»

5@20