Elenco Electronics M-1008K Assembly And Instruction Manual

ELENCO

®

Copyright © 2012 by ELENCO®All rights reserved. 753014

No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

DIGITAL MULTIMETER KIT

MODEL M-1008K

Assembly and Instruction Manual

PARTS LIST

If you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchased this meter
kit from a distributor, catalog, etc., please contact ELENCO®(address/phone/e-mail is at the back of this manual) for
additional assistance, if needed.

RESISTORS (Parts mounted on card)

Qty. Symbol Value Color Code Part #

r 1R7 0.99Ω 0.5% 1/4W black-white-white silver-green 109950
r 1R8 9Ω 0.5% 1/4W white-black-black-silver-green 119050
r 1 R19 10Ω 1% 1/4W brown-black-black-gold-brown 121030
r 1 R18 100Ω 1% 1/4W brown-black-black-black-brown 131030
r 1 R1 100Ω 0.5% 1/4W brown-black-black-black-green 131050
r 1 R23 470Ω 1% 1/4W yellow-violet-black-black-brown 134730
r 1 R12 900Ω 1% 1/4W white-black-black-black-brown 139030
r 1 R2 900Ω 0.5% 1/4W white-black-black-black-green 139050
r 1R9 1.5kΩ PTC Resistor 141569
r 3 R22,26,27 47kΩ 1% 1/4W yellow-violet-black-red-brown 144730
r 1 R10 9kΩ 1% 1/4W white-black-black-brown-brown 149030
r 1R3 9kΩ 0.5% 1/4W white-black-black-brown-green 149050
r 1 R11 20.5kΩ 1% 1/4W red-black-green-red-brown 152130
r 1 R4 90kΩ 0.5% 1/4W white-black-black-red-green 159050
r 2 R14,17 100kΩ 1% 1/4W brown-black-black-orange-brown 160030
r 6 R16,20,21,25,28,29 220kΩ 1% 1/4W red-red-black-orange-brown 162230
r 1 R5 352kΩ 0.5% 1/4W orange-green-red-orange-green 163550
r 1 R6 548kΩ 0.5% 1/4W green-yellow-gray-orange-green 165450
r 1 R15,24,30,31,32 1MΩ 1% 1/4W brown-black-black-yellow-brown 171030

Resistors tolerance may be lower than listed

These parts are not mounted on card:

r 1 R13 0.01Ω Shunt wire 100165
r 1 VR1 200Ω (201) Potentiometer 191300

CAPACITORS

Qty. Symbol Value Description Part #

r 1 C6 100pF (101) Disc 221017
r 1 C7 220pF (221) Disc 222210
r 3 C3, C4, C5 0.1μF (104) Mylar (small) 251017S
r 1C2 0.22μF (224) Mylar (large) 251017L
r 1C1 2.2μF 50V Electrolytic 262247

SEMICONDUCTORS

Qty. Symbol Value Description Part #

r 1 D1,D2,D3 1N4007 Diode (mounted on resistor card) 314007
r 1 Q1 2SA9013 Transistor 329013
r 1 Q2 2SA9015 Transistor 329015

MISCELLANEOUS

Qty. Description Part #

r 1 Liquid crystal display (LCD) 351117
r 1 Zebra 7.5 x 40mm 500008
r 1 PC board, ICs installed 516110
r 1 Fuse 200mA, 250V 5 x 20mm 530020
r 1 Battery 9V 590009
r 1 Battery snap 590098
r 1 Buzzer with wires 595208
r 1 Selector knob 622107
r 1 Case top 623080
r 1 Case bottom 623080
r 1 Zebra frame 629018
r 5 Screw 2.0mm x 6mm (PC Board) 643439
r 2 Screw 2.0mm x 10mm (Case) 643447

Qty. Description Part #

r 2 Fuse holder clips 663100
r 1 Transistor socket 664007
r 3 Input socket 664105
r 2 Ball bearing 666400
r 6 Slide contact 680013
r 2 Spring 2.7 x 4mm (selector knob) 680014
r 1 Spring 3.2 x11mm 680015
r 1 Label shield 750010
r 1 Label meter 724010
r 1 Grease 790004
r 1 Lead-free solder 9LF99
r 1 Test lead set 9TL1008

-1-

-2-

IDENTIFYING RESISTOR VALUES

Use the following information as a guide in properly identifying the value of resistors.

5 Bands

1 2

Multiplier

Tolerance

PARTS IDENTIFICATION

Battery snap

3

4 Bands

1

2

Multiplier

Tolerance

IDENTIFYING CAPACITOR VALUES

Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or μF (microfarads). Most
capacitors will have their actual value printed on them. Some capacitors may have their value printed in the following
manner. The maximum operating voltage may also be printed on the capacitor.

Second digit

First digit

Multiplier

Tolerance*

For the No.01234589

Multiply By 1 10 100 1k 10k 100k .01 0.1

Multiplier

Note: The letter “R” may be used at times to
signify a decimal point; as in 3R3 = 3.3

10μF 16V

103K

100V

The letter M indicates a tolerance of +20%
The letter K indicates a tolerance of +10%
The letter J indicates a tolerance of +

5%

Maximum working voltage

The value is 10 x 1,000 = 10,000pF or .01μF 100V

*

Electrolytic capacitors have a positive and a negative
electrode. The negative lead is indicated on the
packaging by a stripe with minus signs and possibly
arrowheads.

Warning:

If the capacitor is connected
with incorrect polarity, it may
heat up and either leak, or cause
the capacitor to explode.

Polarity
marking

(+)

(–)

RESISTORS

CAPACITORS

Shunt wire

Disc

Mylar

C2

Diode

Carbon film

Transistor

MISCELLANEOUS

Electrolytic

SEMICONDUCTORS

PC board

with ICs installed

Liquid crystal display (LCD)

Zebra

Zebra frame

Buzzer with wires

Selector knob

Fuse holder

clip

Transistor

socket

Input socket

Ball

bearing

Slide contact

Potentiometer

Fuse

Springs

Screws

2.0mm x
6mm

2.0mm x
10mm

-3-

CONSTRUCTION

Solder

Soldering Iron

Foil

Solder

Soldering Iron

Foil

Component Lead

Soldering Iron

Circuit Board

Foil

Rosin

Soldering iron positioned
incorrectly.

Solder

Gap

Component Lead

Solder

Soldering Iron

Drag

Foil

1. Solder all components from the
copper foil side only. Push the
soldering iron tip against both the
lead and the circuit board foil.

2. Apply a small amount of solder to
the iron tip. This allows the heat to
leave the iron and onto the foil.
Immediately apply solder to the
opposite side of the connection,
away from the iron. Allow the
heated component and the circuit
foil to melt the solder.

1. Insufficient heat - the solder will
not flow onto the lead as shown.

3. Allow the solder to flow around
the connection. Then, remove
the solder and the iron and let the
connection cool. The solder
should have flowed smoothly and
not lump around the wire lead.

4.

Here is what a good solder
connection looks like.

2. Insufficient solder - let the
solder flow over the connection
until it is covered.
Use just enough solder to cover
the connection.

3. Excessive solder - could make
connections that you did not
intend to between adjacent foil
areas or terminals.

4. Solder bridges - occur when
solder runs between circuit paths
and creates a short circuit. This is
usually caused by using too much
solder.
To correct this, simply drag your
soldering iron across the solder
bridge as shown.

What Good Soldering Looks Like

A good solder connection should be bright, shiny, smooth, and uniformly
flowed over all surfaces.

Types of Poor Soldering Connections

Introduction

The most important factor in assembling your M-1008K Digital Multimeter Kit is
good soldering techniques. Using the proper soldering iron is of prime
importance. A small pencil type soldering iron of 25 - 40 watts is recommended.

The tip of the iron must be kept clean at all times and well tinned.

Solder

For many years leaded solder was the most common type of solder used
by the electronics industry, but it is now being replaced by lead-free solder
for health reasons. This kit contains lead-free solder, which contains

99.3% tin, 0.7% copper, and has a rosin-flux core.

Lead-free solder is different from lead solder: It has a higher melting point
(about 440

O

F, compared to about 360OF for lead solder), so you need
higher temperature for the solder to flow properly. Recommended tip
temperature is 700OF-800OF; higher temperatures improve solder flow but
accelerate tip decay. An increase in soldering time may be required to
achieve good results. Soldering iron tips wear out faster since lead-free
solders are more corrosive and the higher soldering temperatures
accelerate corrosion, so proper tip care is important. The solder joint finish
will look slightly duller with lead-free solders.

Use these procedures to increase the life of your soldering iron tip when
using lead-free solder:

• Keep the iron tinned at all times.

• Use the largest tip possible for best heat transfer.

• Turn off iron when not in use or reduce temperature setting when
using a soldering station.

•

Tips should be cleaned frequently to remove oxidation before it becomes
impossible to remove. Use Dry Tip Cleaner (Elenco®#SH-1025) or Tip
Cleaner (Elenco®#TTC1).

• DO NOT use a sponge, this worsens tip life because the temperature
shocks accelerate corroding of the tip. If you insist on using a sponge,
use distilled water (tap water has impurities that accelerate corroding).

Safety Procedures

• Always wear safety glasses or safety goggles to protect
your eyes when working with tools or soldering iron,
and during all phases of testing.

• Be sure there is adequate ventilation when soldering.

• Locate soldering iron in an area where you do not have to go around
it or reach over it. Keep it in a safe area away from the reach of
children.

• Do not hold solder in your mouth. Solder is a toxic substance. Wash
hands thoroughly after handling solder.

Assemble Components

In all of the following assembly steps, the components must be installed
on the top side of the PC board unless otherwise indicated. The top legend
shows where each component goes. The leads pass through the
corresponding holes in the board and are soldered on the foil side.

Use only rosin core solder.

DO NOT USE ACID CORE SOLDER!

'

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown. After soldering each part, mark a check þ in the box provided.
Be sure that solder has not bridged to an adjacent pad.

Figure B

Figure A

Stand resistor on
end as shown.
Solder and cut off
the excess leads.

R14 - 100kΩ 1% 1/4W Resistor

(brown-black-black-orange-brown)

(see Figure A)

C2 - 0.22μF (224) Mylar cap.

C3 - 0.1μF (104) Mylar cap.

R32 - 1MΩ 1% 1/4W Resistor
R30 - 1MΩ 1% 1/4W Resistor
R31 - 1MΩ 1% 1/4W Resistor
R15 - 1MΩ 1% 1/4W Resistor

(brown-black-black-yellow-brown)

(see Figure A)

R16 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

R18 - 100Ω 1% 1/4W Resistor

(brown-black-black-black-brown)

(see Figure A)

VR1 - 200Ω (201) Potentiometer

(see Figure B)

R11 - 20.5kΩ 1% 1/4W Resistor

(red-black-green-red-brown)

(see Figure A)

R10 - 9kΩ 1% 1/4W Resistor

(white-black-black-brown-brown)

(see Figure A)

C4 - 0.1μF (104) Mylar cap.
C5 - 0.1μF (104) Mylar cap.

Mount the potentio­meter to the PC board
as shown.

C6 - 100pF (101) Discap

R17 - 100kΩ 1% 1/4W Resistor

(brown-black-black-orange-brown)

(see Figure A)

R23 - 470Ω 1% 1/4W Resistor

(yellow-violet-black-black-brown)

(see Figure A)

R28 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

Q2 - 2SA9015 Transistor

(see Figure C)

C7 - 220pF (221) Discap

R29 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

R24 - 1MΩ 1% 1/4W Resistor

(brown-black-black-yellow-brown)

(see Figure A)

R22 - 47kΩ 1% 1/4W Resistor

(yellow-violet-black-red-brown)

(see Figure A)

C1 - 2.2

μF

50V Electrolytic cap.

(see Figure D)

R19 - 10Ω 1% 1/4W Resistor

(brown-black-black-gold-brown)

(see Figure A)

NOTE: The 7106 IC1 is already installed
on the PC board. This type of installation
is called C.O.B. (chip on board). The
LM358 U2 IC is also mounted and uses
a surface mount package.

Figure D

Be sure that the negative (short) lead is
in the correct hole on the PC board.

Warning:

If the capacitor is connected with incorrect
polarity, it may heat up and either leak, or
cause the capacitor to explode.

Polarity
mark

(–)

(+)

Figure C

Flat

Top legend marking
on PC board

Mount the transistor with
the flat side in the same
direction as the marking on
the PC board as shown.

-4-

Install the following parts. Then, mark a check þ in the box provided.

-5-

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown. After soldering each part, mark a check þ in the box provided.
Be sure that solder has not bridged to an adjacent pad.

R26 - 47kΩ 1% 1/4W Resistor
R27 - 47kΩ 1% 1/4W Resistor

(yellow-violet-black-red-brown)

(see Figure A)

R25 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

R1 - 100Ω 0.5% 1/4W Resistor

(brown-black-black-black-green)

(see Figure A)

R2 - 900Ω 0.5% 1/4W Resistor

(white-black-black-black-green)

(see Figure A)

R3 - 9kΩ 0.5% 1/4W Resistor

(white-black-black-brown-green)

(see Figure A)

R4 - 90kΩ 0.5% 1/4W Resistor
(white-black-black-red-green)

(see Figure A)

R5 - 352kΩ 0.5% 1/4W Resistor

(orange-green-red-orange-green)

(see Figure A)

D1 - 1N4007 Diode

(see Figure E)

R20 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

D3 - 1N4007 Diode
D2 - 1N4007 Diode

(see Figure E)

R12 - 900Ω 1% 1/4W Resistor

(white-black-black-black-brown)

(see Figure A)

R8 - 9Ω 0.5% 1/4W Resistor

(white-black-black-silver-green)

(see Figure A)

R7 - 0.99Ω 0.5% 1/4W Resistor

(black-white-white-silver-green)

(see Figure A)

Q1 - 2SA9013 Transistor

(see Figure C)

R9 - 1.5kΩ PTC Resistor

R6 - 548kΩ 0.5% 1/4W Resistor

(green-yellow-gray-orange-green)

(see Figure A)

R21 - 220kΩ 1% 1/4W Resistor
(red-red-black-orange-brown)

(see Figure A)

r Insert the narrow end of the three input sockets

into the PC board from the top legend, as shown
in Figure F. Solder the sockets to the PC board on
the top legend only. The solder should extend
completely around the socket (see Figure F).

r

Insert the shunt wire (R13) into the PC board
holes from the component side as shown in
Figure F. Solder the wire to the PC board on the
component side only.

r Insert the 8-pin transistor socket into the PC board

holes from the solder side as shown in Figure F.
Be sure that the tab lines up with the hole as
shown in the figure. Solder the socket to the PC
board on the component side of the PC board as
shown in the figure and cut off excess leads.

r Insert the two fuse clips into the PC board holes

on the component side as shown in Figure F.
Solder the clips to the PC board.

r Solder the 11mm spring to the solder pad on the

top legend side of the PC board as shown in
Figure G.

Figure E

Stand diode on end. Mount with band as shown
on the top legend.

Band

Top legend marking on PC board

D2

D3

D1