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Input

Impedance:

1

megohm

Accuracy:

Frequency

DC Current

Range:

AC Current

Range:

Ohmmeter:
Meter:
Power Supply:

Power

A-C

Requirements

Size:

Response:

*\Vo
25

Hz to

0

to

RMS
P-P

0. 2

to
6", 200
Transformer

NEDA No. 1604
D-size

105-132

:

7-Lf2" high,

of. full scale

2

MHz

3,

1,

-

same as d-c

-

0

to 2.8,

1000

1t"

cell

volts

30, 100,

10,

megohms

a movement

isolated,

for ohmmeter

,
8-Lf2" wide,

(with

sinusoidal

(extendable

and

current

28,

8.5,
in

seven

silicon- rectifier , zener regulated;

9-volt batteries for

50f 60

Hz,

to

300

280,

85,

use.

4

1.

VA

5" deep

250

ma, and 1 amp

ranges

input

voltage)

MHz

with EICO

850 ma, and

and

portable

use.

Probe PRF-1l)

RF

2.8

amps.

three

1.5-volt

One

Weight:

CIRCUIT DESCRIPTION
Basic Metering Circuit

Model

The
stage
of

the

is

a function of the d-c

from

242

citcuirt., ahown

driving a differential

Ql,

parameter

being measured

loading tlre inputs at the

end of tlle TVOM.

6lbs,3oz,

in

input

applied to FET

probe,

simplified form

amplifier

(a-c

formed by lilPN silicon transistors

or d-c

Ql.

as

srell

in figure 1, consists of an FET

current, or resistance), the meter reading

voltage

as the

or

high input impedance of the FET

The

switching and

attenuating

Q2

source

and

follower

Q3.

Regardless

prevents

circuits at the front

it

Figure

1. Basic Metering

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1t

OPERATION

!

I

I
l-

Preliminary
Before

Adjustment

applying
check tlrat the
driver,
movement

A-C Power

vERY

on the front

Application

a. WitI tie
leads
volt
If
lead on the

inserted

50-to-60 Hz outlet. Note that

a-c

you

do not have a

adapter to a nearby

a-c or

meter

battery

pointer

CAREFULLY

panel)

possible,

If

power
rests on tJIe left-hand
adjust the meter

until ttle

shorted to one another
ment.

Be sure

slide switch at the rear

in

respective receptacles

their

3-wire receptacle,

ground.

to the_[dodel

pointer

preferable

is

it

remove the

to

of

for safety

use a

242,

zero

screw

zero

rest on the

does

NOTE

that

for this

cabinet

t]te

on

the

sal(e the

3-to-2

CAUTION

place

t]e

scale marks. If

(located

zero mark.

the meter

mechanical

before

short

set to LINE

panel,

front

Model

pin

adapter,

instrument

on a level surface

not, using a fine

directly

below the meter

Iugs be

adjust-

proceeding.

and the Multi-Probe

pIW

tlre Iine

cord into a 105-132

242 is equipped with

be sure to

but

connect the

screw-

ground

and

a 3-wire

ground

and

plug.

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indicate that

power

Battery Operation

a. When

cabinet

D-C

Voltage

to BATTERY

using the Model

Measurements

a. Rotate the

Probe end

can be

Do NOT
voltage
for the

plug

the Model

dilferent frequency

or

instrument will

switch out of the OFF

is applied.

242

as

a

and move tlle MODE

panel

front

The
during
Iine

battery operation.

cord remains

end of the Multi-Probe

rotated either

way.

)

242 into a

(or

be damaged.

position.

portable

switch out

neon lamp

plugged into an a-c

until

instrument,

of t]le OFF

NOTE

does
It will

detent locks

the

source of higher
into a d-c outlet)

front

The

set t}le

position.

not normally

ottly

light

outlet.

light

if

in the DC

'

panel

neon lamp will

slide switch at the

the

position.

(The

l8ht to

rear of tJre

Multi-

b. Set the

on the

polarity

FUNCTION

switch to

of the voltage

to be

VOLTS

measured

and the MODE

t2

switch to either

-DC

or +DC

depending

't

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doubt, always start at
are made at the two
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switch settings

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qlpermost

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the HIGHEST

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3MA,

of

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and 1A.

full

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to

than the

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Use

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Note that

100).

be

to

all

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current

d-c

RANGE

su'itch

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meter

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the NEGATryE end.
deflection,

A-C
A-c

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IOWEST SCALES

lMA, 10MA, 100MA,

In this case, Iead

Ohmmeter Measurements

+DC. The

indicates

e. Connect the common test lead

probe

Current

current

a.

Rotate the end of the Multi-Probe until

b. Place tne

meter should indicate

ground

zero.

should

Measurements

is measured

for all a-c current measurements:

polarity

FUNCTION switch

lead

to the Multi-Probe tip and adjust the ZERO ADJ control until

and the test

be connected

Use a RANGE switch

similar to d-c current. Set t}le Multi-Probe

and 1A; the 0-3 scale

is

not importent.

to the

in

the

up-scale.

POSITIVE end of the circuit and

setting

for RANGE

thb

OHMS

probe

that results

position

detent locks in the AC/OHMS/MA

position

IN SERIES

the

0-1 scde

the

switch settings of 3MA, 30MA,

and the MODE s$'itch to either

witlr tlle circuit being tested.

common

tlre

in

at Ieast l/4-scale

AC/OHMS/MA

to

MODE

for RANGE

switch

to AC. Use t}|e

switch

test lead to

pointer

and the

settings of

and 300MA.

position.

-DC

the

TWO

or

c. Set t}te RANGE switch

ZERO ADJ control until

other

meter

RANGE switch for the most
factor indicated by

internal

RANGE

d.

Remove the

indicates

e.

Remove

f.

Connect the

g.

When not in use,

s$'itch

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power

D cell unnecessarilv.

the meter

setting.

ground-lead

from

ground

the RANGE switch setting.

place

to RX100 and short the

indicates

from

the

the extreme right hand mark

equipment

the

lead and

appropriate deflection. Multiply the

probe

the FUNCTION surltch anray from OHMS to avoid draining the

zero. f)o not

probe

tip,

under test to

across t]le resistance to be measured.

tip

ground

tlen adjust the

change

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@

avoid

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on t}le

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top

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voltage
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position

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indicated

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if

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-DC

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DB

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reference level

0.775
conveniently

volt

across

convert rms a-c

DBM.

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conditions,

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that

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242 is

either ac or dc, ahpays
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start

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pay

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attention

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that there

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results in a different scale. Figure

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voltages

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against

impair the

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the limit

range setting GREATER

a

polarities

to

dB scale on tlle meter.

is no

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reference levels

graph

a

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t]lis

graph

readings

normal operating

meter movement

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t}lan the voltage

\rthen measuring

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in use, and each

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will

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you

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Calibration

maximum

For
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on the

accuracy,

full-scale

30V or 100V

deflection.

NOTE

select

ranges,

a voltage

preferable

is

It

although

any

that

range

produces

calibrate

to

be

may

used.

known

some
adjustable

a.
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c. Set

level of

d-c

set t}le Multi-Probe

the FUNCTION
the RANGE

d. Connect

ground

lide
ranges

Ohmmeter
No

To
ohmmeter

lead to the
and

cabineti
for both

of the

Function.

separate

check for

calibration

ohmmeter

battery.

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1.
place

2.

right, Operate
deilect

full-scale,

dc, such

power

supply

switch to the

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the

positive

until the

-DC

and +DC

is required
leakage

the RANGE

the OHMS

replace the

as a single

as the EICO

such

fresh

to DC.

switch to VOLTS

position'

3V

tip to

terminai.

meter

the

Adjust

reads the

modes.

for the OHMS

switch

switch

control for

ADJ

(if

in

any),

proceed

to OHMS.

the R

1-1/2-volt

cell

dry

Model

and the

negative

(accessible

R24
correct

function

as follows.

position.

I

x

an e:ract

ohmmeter

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1025 must

MODE

switch to

terminal

value,

range.

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full-scale

battery.

an accurate

volts)

or

used' Proceed

be

-DC'

of ttle battery

throryh

This

This

meter

t}re UPPER

adiustment

one

checks the

also

pointer

indication.

metered

follows:

as

or

power

supply and

hole

suffices

condition of the

should deflect

your

If

meter

on the left

a.ll

for

to the

does not

the

3.

meter

The

procedure

this

ringrounded.

and

Rotate

the

should drop

until tlie

indicates defective

4, Isolate

enactly

full scale.

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meter

the

ohmmeter

the

touching

pointer

circuit and

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to zero.

meter

battery

On

g-volt

probe

batteries.

tip

the OHMS

dropJaway

it should

tip to

ttle Ac/oHMs/MA

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pointlr

rests at

oferation,

and set the

ADt
the full-scale

from

be thoroughly

ZERO

both full

the meter

RANGE

switch to

control,

checked.

until

ADI

not

may

place

th€

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r8

position.

it does.

scale

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1.

R x

range

there

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the

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probe

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is

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61

MAINTENANCE

gain

To
support the

access

Iine cord

to the
of the cabinet by
Remove the four screws

panel

back and down

screws t}tat fasten

not

panel.

to

break

To

any

gain

access

An understanding of circuit

replace

to

you

until

electronics circuit

The

first swing

parts,

any

thoroughly understand

rear

the

is elearly identified

while

pulling

to

the

leads

panel
by

chassis,

on

(two

eteose
left
while

to t}le

remove

in

storage or during battery operation.

the frame.

at each side) that fasten the rear

the interior of the unit.

panel

side

removing

RANGE switch, remove the right side

operation

study

the text and simplified diagrams

is on a PC board

back

out of

printed

designations

are replaced, carefully unsolder
being sure
foil lifts from

tltat

you

the

create

board.

no solder bridges. Be careful not

Voltage Measurements

Table 3 specifies tJre
Remove

one

lead of each resistor

capacitance checker

various voltages to be

to test the capacitors.

tJre four screws

at

the rear of the cabinet.

)

panel

to the front

panel.

this

greatly

will

get

To

panel

and

gen y

The tuio calibration controls are

facilitate trouble localization.

the MODE

to

move

presented

circuit in

the

question.

tllat mounts to tJre meter Iugs.

the u'ay, then

on tlre

the leads from the foil side of

unfasten

tfie two meter

component

side of

board and

the

to apply so much heat that

found

in

the

circuit.

from the board and check it for correct

(Two

of these.

Carefully slide t}e chassis out

to the

panel

instrument.

switch, remove

panel

the

aside. Be careful

in tlle same

Swing

the two

mounted on

way.

the

this

Before attempting

under

the

CIRCUIT

remove

To

nuts.

board.

DESCfuPTION

the PC board,

Each component

If any components

replace the component,

copper

the

value.

an in-circuit

Use

Q1

-

gate
drain
sonrce - 4.5

1. 0

-

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Table

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Q2

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4.5

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3.7

6.8

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CREATIVE

ELECTRONICS

years,

For over

electronic

tronis kits

dealers and

Whatever
satile,
designed
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kits are so
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more than 2500

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ment

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ects, Citizens

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Should

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