Elenco Electronics M-1006K Guía del usuario

DIGITAL MULTIMETER KIT

MODEL M-1006K

Assembly and Instruction Manual

Elenco Electronics, Inc.

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 Electronics

(address/phone/e-mail is at the back of this manual) for additional assistance, if needed. DO NOT contact your

place of purchase as they will not be able to help you.

RESISTORS (Parts mounted on card.)

Qty. Symbol Value Color Code Part #

1R9 .01ΩShunt Wire 100161

1R8 .99Ω.5% 1/4W black-white-white-silver-green 109930

1R7 9Ω.5% 1/4W white-black-black-silver-green 119000

1 R13 100Ω5% 1/4W brown-black-brown-gold 131000

1 R6 100Ω.5% 1/4W brown-black-black-black-green 131050

1 R5 900Ω.5% 1/4W white-black-black-black-green 139050

1 R17 910Ω1% 1/4W white-brown-black-black-brown 139130

1 R12 1kΩ5% 1/2W brown-black-brown-gold 141000

1 R14 4.7kΩ5% 1/4W yellow-violet-red-gold 144700

1R4 9kΩ.5% 1/4W white-black-black-brown-green 149050

1 R15 30kΩ1% 1/4W orange-black-black-red-brown 153030

1 R3 90kΩ.5% 1/4W white-black-black-red-green 159050

1 R25 100kΩ5% 1/4W brown-black-yellow-gold 161000

3 R10, R11, R24 220kΩ5% 1/4W red-red-yellow-gold 162200

1 R2 352kΩ.5% 1/2W orange-green-red-orange-green 163551

5 R18 - R22 470kΩ5% 1/4W yellow-violet-yellow-gold 164700

1 R1 548kΩ.5% 1/2W green-yellow-gray-orange-green 165451

1 R23 1MΩ5% 1/4W brown-black-green-gold 171000

Placed in bag with carded parts.

1 R16 200Ω(201) Potentiometer 191310

CAPACITORS

Qty. Symbol Value Description Part #

1 C1 100pF (101) Disc 221017

4 C2, C3, C4, C6 .1µF (104) Mylar (small yellow) 251017S

1C5 .1µF (104) Mylar 251017

SEMICONDUCTORS

Qty. Symbol Value Description Part #

1 D1 1N4007 Diode (mounted on resistor card) 314007

MISCELLANEOUS

-1-

Qty. Description Part #

1 LCD 351115

2 Zebra 500006

1 PC Board IC Installed 516101

1 Fuse 0.2A, 250V 533002

1 Battery 9V 590009

1 Battery Snap 590098

1 Selector Knob 622104

1 Case Top (Black) 623113

1 Case Bottom (Black) 623209

1 Zebra Frame 629012

3 Screw 2mm x 6mm 643439

Qty. Description Part #

2 Screw 2mm x 10mm 643447

2 Fuse Holder Clips 663100

1 Socket Transistor 664007

3 Input Socket 664101

2 Ball Bearing 666400

6 Slide Contact 680013

2 Spring 1/4” (Selector Knob) 680014

1 Label Front 724012

1 Grease 790004

1 Solder Tube 9ST4

1 Test Lead Set RWTL1000B

NOTE:

Not used but printed on PC board: R26 - R29, T1

The 7106 IC1 is already installed on the PC board. This type of installation is called C.O.B. (chip on

board). The IC is tested after it is installed on the PC board.

-2-

IDENTIFYING RESISTOR VALUES

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

5 Bands

1 2 Multiplier

Tolerance

Resistors

PARTS IDENTIFICATION

PC Board with IC

Potentiometer

Ball Bearing

Selector Knob

Battery Snap

Fuse

Clip Slide

Contact

Transistor

Test Socket

Fuse

Input Socket

4 Bands

12Multiplier

Tolerance

Diode

Shunt Wire

LCD Assembly

Zebras/LCD/Frame/Cover

Capacitors

Discap

Mylar

Abbreviation Means Multiply Unit By Or

p pico .000000000001 10-12

n nano .000000001 10-9

µmicro .000001 10-6

m milli .001 10-3

– unit 1 100

k kilo 1,000 103

M mega 1,000,000 106

1,000 pico units = 1 nano unit

1,000 micro units = 1 milli unit

1,000 units = 1 kilo unit

1,000 nano units = 1 micro unit

1,000 milli units = 1 unit

1,000 kilo units = 1 kilo unit

METRIC UNITS AND CONVERSIONS

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*

FortheNo.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

Zebra

Frame

Zebras

LCD

-3-

Introduction

The most important factor in assembling your M-1006K 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.

Safety Procedures

• Wear eye protection when soldering.

•

Locate soldering iron in an area where you do not have to go around it or reach over it.

•Do not hold solder in your mouth. Solder contains lead and is a toxic substance. Wash your hands

thoroughly after handling solder.

• Be sure that there is adequate ventilation present.

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 of 63/37 alloy.

DO NOT USE ACID CORE SOLDER!

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.

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

-4-

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown. After soldering each part, mark a check in the box provided.

Be sure that solder has not bridged to an adjacent pad.

Figure BFigure A

Stand resistor on end as

shown. Solder and cut

off the excess leads.

C1 - 100pF (101) Discap

C2 -

.1µF (104) Mylar (small yellow)

R22 - 470kΩ5% 1/4W Resistor

(yellow-violet-yellow-gold)

(see Figure A)

R21 - 470kΩ5% 1/4W Resistor

(yellow-violet-yellow-gold)

(see Figure A)

R25 - 100kΩ5% 1/4W Resistor

(brown-black-yellow-gold)

(see Figure A)

R15 - 30kΩ1% 1/4W Resistor

(orange-black-black-red-brown)

(see Figure A)

R16 -

200Ω(201) Potentiometer

(see Figure B)

R17 - 910Ω1% 1/4W Resistor

(white-brown-black-black-brown)

(see Figure A)

R14 - 4.7kΩ5% 1/4W Resistor

(yellow-violet-red-gold)

(see Figure A)

R13 - 100Ω5% 1/4W Resistor

(brown-black-brown-gold)

(see Figure A)

R19 - 470kΩ5% 1/4W Resistor

R18 - 470kΩ5% 1/4W Resistor

(yellow-violet-yellow-gold)

(see Figure A)

Mount the potentiometer to the PC board as shown.

R20 - 470kΩ5% 1/4W Resistor

(yellow-violet-yellow-gold)

(see Figure A)

C5 - .1µF (104) Mylar

R24 - 220kΩ5% 1/4W Resistor

(red-red-yellow-gold)

(see Figure A)

C4 -

.1µF (104) Mylar (small yellow)

C3 -

.1µF (104) Mylar (small yellow)

R23 - 1MΩ5% 1/4W Resistor

(brown-black-green-gold)

(see Figure A)

R6 - 100Ω.5% 1/4W Resistor

(brown-black-black-black-green)

(see Figure A)

R5 - 900Ω.5% 1/4W Resistor

(white-black-black-black-green)

(see Figure A)

R4 - 9kΩ.5% 1/4W Resistor

(white-black-black-brown-green)

(see Figure A)

R3 - 90kΩ.5% 1/4W Resistor

(white-black-black-red-green)

(see Figure A)

-5-

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown. After soldering each part, mark a check in the box provided.

Be sure that solder has not bridged to an adjacent pad.

Figure C

Stand diode on end. Mount

with band as shown on the top

legend.

C6 -

.1µF (104) Mylar (small yellow)

R1 - 548kΩ.5% 1/2W Resistor

(green-yellow-gray-orange-green)

R2 - 352kΩ.5% 1/2W Resistor

(orange-green-red-orange-green)

R11 - 220kΩ5% 1/4W Resistor

(red-red-yellow-gold)

(see Figure A)

R10 - 220kΩ5% 1/4W Resistor

(red-red-yellow-gold)

(see Figure A)

D1 - 1N4007 Diode

(see Figure C)

R7 - 9Ω.5% 1/4W Resistor

(white-black-black-silver-green)

R8 - .99Ω.5% 1/4W Resistor

(black-white-white-silver-green)

R12 - 1kΩ5% 1/2W Resistor

(brown-black-brown-gold)

Band

Insert the narrow end of the three input sockets into the PC board from the solder side, as shown in Figure D.

Solder the sockets to the PC board on the component side only. The solder should extend completely around

the socket (see Figure D).

Insert the shunt wire (R9) into the PC board holes from the component side as shown in Figure D. Adjust

the wire so that it sticks out the other (solder) side of the PC board 3/16 of an inch. Solder the wire to the

PC board on the component side only.

Be sure that the 8-pin transistor socket will slide easily through its hole in the top case from either direction.

If it does not, carefully slide it through the hole several times in each direction to remove any burrs. Do not

push on the socket leads or they may be damaged.

Insert the socket into the PC board holes from the solder side as shown in Figure D. 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.

Feed the battery snap wires up through the holes in the PC board from the solder side as shown in Figure D.

Insert the red wire into the hole marked (9V+) and black wire into hole marked (9V–) as shown. Solder the

wires to the PC board.

Insert the two fuse clips into the PC board holes as shown in Figure D. Be sure that the tabs are on the

outside as shown in the figure. Solder the clips to the PC board.

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

-6-

Close-up view of the

transistor socket and

PC board.

Solder Side

Figure D

Tab

Input Sockets

Shunt Wire

Red Wire

Black Wire

Solder

Battery Snap

Transistor

Socket

Fuse Clips

Remove the clear protective film from the front of the LCD (Note:

DO NOTremove the silver backing). Place the LCD, zebra frame,

and zebras into the top case as shown in Figure E. Be sure that

the LCD tab is in the same direction as shown in the figure.

Cut open the plastic envelope containing the grease and put a

small amount of grease in each spring hole of the selector knob

as shown in Figure F. Then, insert a 1/4” spring into each hole as

shown in the figure.

Clear Protective Film

Figure F

Spring Holes

1/4” Springs

Figure E

LCD

Zebras

Tab

Zebra Frame

Top Case

Put the bearings into two opposite indents in the case top as shown in Figure G.

Place the six slide contactors on the selector knobs as shown in Figure G.

Place the selector knob into the case top so that the springs fit over the bearings as shown in Figure G.

Place the PC board over the selector knob. Be sure that the 8-pin socket slides into its hole. Then fasten

the PC board with two 6mm screws as shown in Figure G.

Insert the 0.25A, 250V fuse into the fuse clips. Your fuse may be unmarked.

Peel the backing off of the front label and place it on the case top.

Connect a 9V battery to the battery snap.

-7-

Figure G

PC Board

6mm Screws

Slide Contactor

Rib

Close-up View

Bearings

Battery Compartment

Case Top

Selector Knob

CALIBRATION

Refer to the METER OPERATION section for test lead connections and measurement procedure.

A/D CONVERTER CALIBRATION

Turn the range selector switch to the 20V position and connect the test leads. Using another meter of known accuracy,

measure a DC voltage of less than 20 volts (such as a 9V battery). Calibrate the kit meter by measuring the same voltage

and adjusting R16 until the kit meter reads the same as the accurate meter (do not use the kit meter to measure its own

battery). When the two meters agree, the kit meter is calibrated. Turn the knob to the OFF position and remove the voltage

source.

SHUNT WIRE CALIBRATION

To calibrate the shunt wire, you will need a 5 amp current source such as a

5V power supply and a 1 ohm, 25 watt resistor. If a 5 amp source is not

available, you can use a lower current (2 amps). If no supply is available, it is

not important to do this test. Set the range switch to the 10A position and

connect the test leads as shown in Figure H. If the meter reads higher than

5A, resolder the shunt wire so that there is less wire between the 10A DC and

COM sockets.

If the meter reads low, resolder the shunt wire so that there is more wire

between the sockets.

1) ACV Range: 750 0 0.0

200 0 0 0

2) DCA,10A Ranges: 200µ0 0.0

2000µ0 0 0

20m 0.0 0

200m 0 0.0

10A 0.0 0

3) Ohms, Diode and hFE Ranges: B indicates blank.

hFE 0 0 0

Diode ( ) 1 B B B

200 1 B B.B

2000 1 B B B

20k 1 B.B B

200k 1 B B.B

2000k 1 B B B

4) DCV Range: 200m 0 0.0

2000m 0 0 0

20 0.0 0

200 0 0.0

1000 0 0 0

-8-

TESTING, CALIBRATION, AND TROUBLESHOOTING

TESTING OF LCD

With no test leads connected to the meter, move the selector switch around the dial. You should obtain the following

readings. A (–) sign may also be present or blinking.

If any of these tests fail:

a) Check that the battery is good.

b) Check the values of resistors R14, R15, R19, R20, R23 - R25.

c) Check the values of capacitors C1 - C6.

d) Check the PC board for solder bridges and bad solder connections.

e) Check that the slide contactors are seated correctly.

f ) Check that the LCD and zebras are seated correctly.

If the calibration fails:

a) Check the PC board for solder bridges and bad solder connections.

b) Check the value of resistors R7 - R9, R23, and capacitor C3.

10A DC

VΩmA

COM Figure H

1Ω

25 Watts

Power Supply

5VDC –

123

AC VOLTS TEST

To test the ACV ranges, we will need a source of AC voltage. The AC power line is the most convenient.

CAUTION: Be very careful when working with 120VAC. Be sure that the range switch is in the 200 or 750VAC

position before connecting the test leads to 120VAC.

1) Set the range to 200VAC and measure the AC power line. The voltage should be about 120VAC. Compare

the reading to a meter of known accuracy.

2) Set the range to 750VAC and measure the AC power line. The voltage should be about 120VAC. Compare

the reading to a meter of known accuracy.

If either if the above tests fail:

a) Check the values and the soldering of resistors R1 - R6, R22.

b) Check that diode D1 is mounted as shown in the assembly instructions.

DC AMPS TEST

1) Set the range switch to 200µA and connect the meter as in Figure J. With RAequal to 100kΩthe current

should be about 90µA. Compare the reading to a known accurate meter.

2) Set the range switch and RAas in the following table. Read the currents shown and compare to a known

accurate meter.

If any of the above tests fail:

a) Check the fuse.

b) Check the value and soldering of resistors R7, R8, and R9.

DC VOLTS TEST

1) If you have a variable power supply, set the supply to about the midpoint of each of the DCV ranges and compare the

kit meter reading to a meter known accuracy.

2) If you do not have a variable power supply, make the following two tests:

a) Set the range switch to 2000mV and measure the voltage across the 100 ohm resistor of Figure Ia. You should get

about 820mV. Compare the reading to a meter of known accuracy.

b) Set the range switch to 200mV and measure the voltage across the 100 ohm resistor of Figure Ib. You should get

about 90mV. Compare the reading to a meter of known accuracy.

If any of these tests fail:

a) Recheck the meter

calibration.

b) Check the value and the

soldering of resistors R1-

R6, R12-R17, R21-R24,

and capacitor C3.

-9-

Figure J

Figure Ia Figure Ib

1kΩ

10A DC

VΩmA

COM

100Ω

123

10kΩ

10A DC

VΩmA

COM

100Ω

123

Range Switch RACurrent (approx.)

2000µA 10kΩ900µA

20mA 1kΩ9mA

200mA 470Ω19mA

VΩmA

COM

10A DC

123

Accurate

Meter

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