Simpson 215 User manual

INSTRUM ACCURATE

OPERATOR'S

MANUAL

MODEL 2r5

VOLT-OHM.MILLIAMMETER

SIIilPSON ELECTRIC COIt[P.f,NY

5200-18 West Kinzie Street, Chlcogo 44, Illinob

In Cqncdc, Bcch-Simpson, Ltd., London, Oniario

Figure I Simpson Modet 215 VolrOhm'Millidmmelet

Sizet 5r/2"x7"x3%". Weight 3yr lbs.

TABLE

OF CONTENTS

SECNON I GENERAT DESCNIPTION

Generql Introduction

Meosurement

Ronges

Avqiloble...........

D.C. Voltage

A.C. Voltoge

A.F.Output

Voltcge..............................

Volumelevel in Decibels....................

D.C. Resistqnce

Current in D.C.Circuits

D,C. Voltoge Meqsurements

A.C. Voltoge Meosurements.

D.C. Resistcrnce

Meqsurements..............

Current Meosurementsin D.C.Circuits..

SECTION II

PAR. PAGE

2d7

2b8

2c8

2d8

2eB

2II

OPERATING INSTRUCI'IONS

D.C.

VoltogeMeosurements

0-1000

V............

A.C. VoltogeMeosurements

0-1000

V............

A.F. Output Meosurements.

VolumeLevel Meqsurements............................

D.C.Resistqnce

Meqsurements

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

Curtent Meosutementsin D.C.

Circuits............

FUNCNOMNG OF PARTS

D.C. Voltmeter

A.C. Voltmeter

A.F. OutputMeter ............

Volume Level Meter.........

D.C.

Ohmmeter

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

D.C. Milliommeter

SECTION IV MAINTENANCE

,,. o

SECTION III

SECNON V SUPPLEMENTARY DATA PAR. PAGE

Model 215

cs q Condenser

Tester............. | 24

RMA Resistor

Color Code Chort................ 2 27

RMA Mico CopocitorColor

CodeChort..................3 28

Volts-Decibels

Conversion Tcble................ 4 29

Ccpccitive Reoclcrnces 5 30

Audio Frequencies......... 5c 30

RodioFrequencies

.................. 5b 30

Figure I

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8<r

Figure 8b

Figure I

Figure lOc

Figure lOb

Figure ll

Figure 12

Figure 13

IIST OF ILLUSTRATIONS

PAGE

Simpson Model 215 VolfOhm Milliqmmeter... 2

SimpliliedD.C.Voltmeter

Circuit........................................

SimplifiedA.C. VoltmeterCircuit...........................................

Simplilied

OutputMeterCircuit

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

Ohmmeter Circuit with SelectorSwitch in PositionRxl .......16

Ohmmetet Circuit with Selector Switch in Position Rxl00 . 17

Ohmmeter Circuit with Selector Switch in Position Rxl,000 17

Simplilied

MicroommeterCircuit.............................................

Simplilied

MilliommeterCircuit.............................................

Model 215Schemotic

Dio9rom........... .............

Model 215

PortsLoyout-Reqr View....................................

Model 2I5 Ports Loyout-Recr View oI Front Pcnel.............22

Model 215Usedos Condenser

Tester......................................

RMA Resisto!ColorCodeChort

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

RMA Mico Copocitor

ColorCode

Chort................

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

-J

%orrc'r,aortd

As the purchcser of c Simpson 215 you qre now the owner

of one of the most fqmous testing instruments in the world.

Compcct, oI relctively high sensitivity (200microamperes full

scqle), the Model 215 hcs eqrned its top-rcnking reputction

qs the result of quclity construction joined to exceptioncl

engineering versctility. This engineering superiority is, in

turn, the product of invclucble yecrs of experience with

every single unit comprising the complete cssembly.

In no other instrument of its kind do you find fectures such

qs qre contqined in the Simpson Model 215.

Its trim, scientific

qppecrqnce - the 4Yz" modernistic instrument, the hecvy

bckelite cqse, the neqt bckelite pcnel - gives evidence of

inner quclity. These hidden feqtures qre too numerous to

mention here, but yow pride in your new instrument will

grow crsyou lecrn oI them. Pqrts qre qssembled cnd plcced

in position so they ccrnnot become loose or detoched from

their origincl positions. All the sub-qssemblies qre mounted

on speciclly designed bqketite panels, or on c speciclly

designed sub-pcnel, mqde qnd engineered expressly for c

specific lunction in the Model 215.

When you purchase Simpson test equipment, you get equip-

ment mqde qlmost entirely within the vqrious plcnts of our

Compony. Ecch component pcrt of the 215hqs been designed

cnd completely tooled qnd mqnufqctured in our own plcrnts,

with the exception of the precision resistors qnd one or two

other functionolly leust importont parts. The Model 215,like

cll other Simpson testers, is not qn assembly job made up

from purchcsed parts such qs is true of the mcrjority oI testers

offered on the mqrket.

We cre by lor more self-contqined thcn crny other mqnufqc-

turer of test equipment. This is your qssurqnce thqt the

testers we olfer will not quickly become obsolete. Our tre'

mendous investment in expensive production tools is your

scfegucrd cgcinst obsolescence cnd {urther qssuronce of

unvcrying quclity.

Here qt Simpson we do not think of mcking instruments

merely to seII. We think of making instruments to serve' Our

interest in your Model 2I5 cnd in your sqtislcrction with it

never cecses. Thct is the reqson for this Operctor's Mcnuql'

We wqnt you to know how to get the most from your 215'

The Model 215 is c rugged instrument and will withstqnd q

grect decl of obuse. We urge you, however, to treqt it with

cqre qs its mechonism is qctuqlly more deliccrte thon thct of

a wqtch. If you will keep it cleqn, free from continuous,

severe vibrction and cvoid &opping it, your Model2l5 will

give you c liletime of qccurqte, dependcble service.

OPERATOR'S

MANUAT

SIMPSON MODET 2I5 VOLT.OHM.MNLIAMMETER

SECTIOII I

GE:NERAL

DESCRIPTION

I. GENERAI INTRODUCTION.

The Simpson

Model 2lS TestUnit olfers c small, compact

qnd complete

instrument

with high sensitivity

for testinqlnd

locnting trouble in cll types of circuits. Thd lcrge foui qnd

one,-hslf

inch meter provldes c long scalethat is 6csy b,;J

nld thecompactqucmgement

o{thecontrolsallows ihe over_

all size of the bckelite housing to be compcrctively smcll

for mcximum portobility.

It comescomplete with one set of red,ond blcck test leqds

wtih insuloted clips cnd operalor's mqnuql.

Theelectricql circuit is designedto give mqximum insurqnce

agcinst incccurccy cnd dcrmcgelo ihe component

pcrts. Im-

pregncted-coble wiring is used throughout.-All resistorscre

mqde to close tolerqncesfor cccurciy qnd qre firmlv heid

in plcce.onc specicl bckelite plcte mochinedfor thisprirpos-.

rhe entire cssembly is truly rugged qnd cqn well withitcnd

theweqr cnd teqr of theservicework Ior which it is designed.

Accurccy is 3% D.C.

cnd S%A.C.of full sccledeflectiol.

2. MEASUREMENT

RANGESAVAIIABIE

c. D. C.VOLTAGE

0-2.5 volts

0-10 volts

0-50 volts

0-250volts

0-1000

volts

lat '. -

to, *# i,r

ff0$ohms per

voltsensitivity

i)i.1.,

b. A. C.VOTTAGE.

0-2.5 volts \

0-10 volts I

0-50 volts ) 1,000ohms

pervoltsensitivity

0-250volts \

0-1000

volts /

.- {'ol 'Y;t'l\

A.F.OUTPUTVOITAGE.

0-2.5 volts \

0-10 volts I

0-50 volts ) .l Mf. interncrlseriescondenser

0-250volts \

0-1000volts /

d. VOTUME

TEVELIN DECIBEIS.

-l2to* 3decibels

0to f 15

decibels

f 14to f29 decibels

f2B to f43 decibels

*40 to f55 decibels

e. D.C.

RESISTANCE.

). ? k €-*o8o ohms ' :' (8&ohms center)

- i i .r k 0-400$€O

ohms I a '.'- (900S

ohms center)

' , \'e;;Afmegohms i2 ;),; r,- €&'00e

ohms cbnter)

f. dURRENT

IN D. C. CIRCUITS.

I i # '250microqmperes ?,f,' *0O millivolts

10 millicmperes

I00 milliomperes

500millicmperes

1 Sy: " : y

3. D. C. VOLTAGEMEASUREMENTS.

D. C. voltcge is mecsured by cpplying the unknown volt-

age to the meter through suitcble inteftgl series resistors.

Tfre

meterhas c full scqiesensitivity of d#microamperes at

7 ,ir, 2€ffmillivolts

with qninterncrl

resistqnce

L000phms,giving

the instrument cn overcll sensitivity of Sf00ohms per volt.

7a):

Cqlibrcted Ior use

qcross c 500

ohm line

€SO.miltivelts--

-998*raillivolt+-

-999.6-nillivolls

4. A. C. VOTTAGE MEASUREMENTS.

A. C_.voltqge mecrsurements, including output cnd decibel

readings, qre mqde possible by the usebf cn internal copper

oxide rectifier connected in series with the meter. A precision

wound internql shunt resistor is connected in pctclel with

the meter resulting in crsensitivity oI 1,000

ohmi per volt.

5. D. C. RESISTANCE MEASUREMENTS.

D. C. resistance is meqsured by the use of suitqble internql

series qnd shunt resistors in series with c bcttery to give accu-

rqte scqle delledion of themeter when qn unknown iesistqnce

is to be meqsured.

6. CURRENT MEASUREMENTS IN D. C. CIRCUITS.

Current is meqsured by the use of suitcble internal shunts

so thct the mqximum current in each rqnge will prod.uce c

full sccle deflection of the meter.

SECTIOil II

OPENATING

INSTRUCTIONS

CAUTION: When making m_eqsurements,

turn ofl the power

tothe

circuit

under

test,

clipthe

test

leqdstothe

desired-points

cnd thenturn on the powerto tcke thereading.

Turndtt tt e

powerto disconnect

themeter.

ZEROADIUSTMENT: Belore tcking recdings, be sure that

thepointer is on zero.

If pointeris olf zero,

cdiust by mecnsof

theslottedscrewlocqted

in thebcrkelite

cqse

direitly below

themeterscqleqsshownin Figure l. Usec smcll screil-driver

to turn this cdjtEtment slowly right or left until the pointer

is directly over the zeropoint on the scqle.

I. D. C. VOLTAGEMEASUREMENTS

O-IOOO

VOITS.

q. Plqce

the "OUTPUT-A.C.-D.C."

switchin the "D.C.,,

posi-

tion.

b. Rotcte the rcnge selectoi switch to cny one of the volt-

cae positions required. WHEN IN DOUBT OF THE VOLT-

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