Allied Radio Knight-Kit 83 Y 140 Manual de montagem - Página 2

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The

improved

circuit

design

of the

KNIGHT

VOM

assures

a sensitive

and

accurate

test

instrument

for the radio-

TV serviceman, the laboratory technician,

the

amateur.

You may

measure

any

voltage

found

in radio

and

electronics

work up to 5000 volts.

The

input resistance

for DC scales is 20,000

ohms

per volt.

This enables you to read

voltages in high impedance circuits with-

out interfering with the circuit.

For AC

voltage

measurements

it is 5000 ohms

per volt.

Direct

currents

may

be meas-

ured up to 10 amperes.

There

are

three

resistance

ranges.

Center

scale

readings

are

12, 1200,

and

120,000

ohms.

All

multipliers

are

1% precision

resistors, which assure ac-

curate

measurements

for

the life of the

instrument.

Check all of the parts against the Parts

List as you unpack the VOM

kit.

If you

are unable to identify some

of the parts

by sight, locate them on the pictorial dia-

grams.

Hardware

is listed in the last part of

the Parts

List.

To keep our kits at the

lowest possible price, we frequently weigh

hardware,

rather

than to count it one by

one.

Therefore,

not

be concerned if

nuts and

machine

screws

for ex~

ample, are supplied than are specified in

the Parts

List.

The only tools you will need are:

long-

nose

pliers, diagonal

cutters,

a screw-

driver,

a small

set-screw

driver,

and a

soldering iron.

Building your

KNIGHT

20,000 ohms per

volt VOM

will be easier

if you study all

of the diagrams

and

instructions

before

assembly

is started.

The pictorial diagrams show the actual

location

of all

parts

and

wiring.

The

KNIGHT

VOM

will work

best

when all

parts

are

placed

shown

in the dia-

grams.

The

schematic

diagram

shows

how the parts are connected electrically,

and

is useful in understanding

how the

instrument

works.

These

step-by-step

instructions

were

prepared

while

actually

building

the

KNIGHT

VOM.

They

are

the

best

and

fastest way of assembling this unit.

May '

we suggest that you check off each step

after you have completed it.

Some build-

ers

also put a pencil mark on the wiring

views along the leads and parts that they

have just installed.

Both of these methods are good and will

assure

speedy and correct wiring.

WIRING AND SOLDERING

The

quality

workmanship

test

equipment

will often

determine

whether

an instrument will be an accurate and re-

liable service tool.

While

these

wiring

and soldering hints will be more helpful

to a beginner in electronics, the more ex-

perienced builder may also benefit by re-

viewing them.

Make

good mechanical

connections

joints, clean metal to clean metal.

Loop

the wires

around

the switch,

other

con-

nection

terminals,

and clamp tight.

Cut the excess

lengths of all end leads

of the resistors

when

they are soldered.

When

a solder

connection

is made close

to one of the precision resistors, hold the

jaws of a pair of long-nose

pliers on the

lead between the tip of the soldering iron

and the resistor to conduct the heat away

from the resistor.

Arrange the long wire

leads to lay close to the panel.

USE ONLY ROSIN CORE SOLDER.

Use

the rosin core solder supplied with the kit

as KITS WIRED

WITH ACID CORE SOL-

DER

ACID FLUX

WILL

CORRODE

and WILL NOT WORK FOR LONG.

SUCH

KITS ARE

NOT

ELIGIBLE

FOR

REPAIR

OR SERVICE.

The

soldering

iron

tip must

be well

tinned.

First,

clean

the

tip with

steel

wool or a fine file until the bright copper