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-6-

ASSEMBLY

The meter kit has been divided into a number of
sections to make the assembly easy and avoid
major problems with the meter operation.

OPEN ONLY THOSE COMPONENT BAGS THAT
ARE CALLED FOR IN YOUR ASSEMBLY
PROCEDURE.

DO NOT OPEN ANY OTHER

BAGS.

Do not build more than one section of your meter at
a time. Your instructor must approve the proper
operation of the section you have built before you
proceed to the next section. This procedure will
minimize the problems you may have at the
completion of the project.

Your kit program is divided into Sections “A – F”.
The small parts bags will be marked accordingly.
The sections are listed below.

Section A - Meter display circuit assembly.

Section B - DC voltage and current circuit

assembly.

Section C - AC voltage and current circuit

assembly.

Section D - Resistance circuit assembly.

Section E - Capacitance and transistor testing 

circuit assembly.

Section F - Final assembly.

IMPORTANT CONSTRUCTION NOTES

1. Wash your hands with soap and water before you

assemble this kit. The high impedance areas on
the  circuit board can be contaminated by salt
and oil from your skin. If these areas become
contaminated, your completed multimeter may
not meet the listed specifications.

Handle the

circuit board only by its edges.

2. Avoid any excessive accumulation of resin build-

up whenever you solder a connection.

3. Take your time assembling the circuit board.

Work at a slow pace. Remember that accuracy
is far more important than speed.

4. When you perform the steps in assembly, identify

each respective component before you install it.
Then position it over its outline on the top legend
side of the PC board, unless otherwise indicated.

5. Check for the proper polarity of ICs, diodes,

electrolytic capacitors, battery snap and LCD.

Transistor h

FE

Range

Test Condition

NPN

10mA 2.8V

PNP

10mA 2.8V

Diode Test

Measures forward resistance of a semiconductor junction in k Ohm at max. test current of 1.5mA.

3. OPERATION

3-1 Preparation and caution before measurement

-29-

LCD Display

Range Selector Knob

Capacitor Input Socket

20A Input Jack

(200mA Max) A input Jack

Selector Switch

h

FE

Input Socket

Volt Ohm Input Jack

Common Input Jack

1. If the function must be switched during a

measurement, always remove the test leads
from the circuit being measured.

2. If the unit is used near noise generating

equipment, be aware that the display may
become unstable or indicate large errors.

3. Avoid using the unit in places with rapid

temperature variations.

4. In order to prevent damage or injury to the unit,

never fail to keep the maximum tolerable voltage
and current, especially for the 20A current range.

5. Carefully inspect the test lead.

If damaged,

discard and replace.

3-2 Panel Description

Summary of Contents for M-2665K

Page 1: ...ttp www elenco com e mail elenco elenco com DIGITAL MULTIMETER KIT MODEL M 2665K WIDE RANGE DIGITAL MULTIMETER WITH CAPACITANCE AND TRANSISTOR TESTING FEATURES Assembly and Instruction Manual Elenco E...

Page 2: ...xperience in soldering and wiring technique you should have no problems For the beginner care must be given to identifying the proper components and in good soldering habits Above all take your time a...

Page 3: ...scharge as fixed rate slope When the charge is equal to the initial starting point autozero level the read period is ended Since the discharge slope is fixed during the read period the time required i...

Page 4: ...is CAUTION sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly adhered to could result in damage to or destruction of part or all of the instrument This...

Page 5: ...ck 3 Set the range selector knob to the position 4 If the semiconductor junction being measured is connected to the circuit turn off the power to the circuit being tested and discharge all of the capa...

Page 6: ...leads to the device or circuit being measured 5 Turn on the power to the device or circuit being measured The voltage value will appear on the digital display along with the voltage polarity 6 Turn o...

Page 7: ...es 2 Avoid any excessive accumulation of resin build up whenever you solder a connection 3 Take your time assembling the circuit board Work at a slow pace Remember that accuracy is far more important...

Page 8: ...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 s...

Page 9: ...0 1 2 3 4 5 8 9 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 10 F 16V 103K 100V The letter M indicates a tolerance...

Page 10: ...crew 1 2 turn Slip the two shims under the knob see Figure L If they do not slip in turn back the screw another 1 4 turn Tighten the screw just enough so that the shims can be pulled out You should no...

Page 11: ...0000 1 PC Board 516000A 1 Solder Roll 551135 1 Battery Snap BAT 590098 1 Battery 590009 1 LCD Window Plate 621002A 1 Range Selector Knob 622003 1 Bushing 624004 Qty Description Part 1 LCD Stopper 6290...

Page 12: ...N5232 Diode see Figure C BAT Battery Snap Insert both wires through the hole and mount the red wire to the hole and the black wire to the hole Solder the wires from the top legend side Notch Notch 24...

Page 13: ...Range Selector Knob LCD Window Plate NOTE If the range selector switch becomes hard to turn then loosen the M2 3 x 8 screw slightly 23 Testing Procedure SECTION C AC voltage and current circuit Measu...

Page 14: ...R1 9M 5 1 2W white black black yellow green 179051 1 VR1 200 220 Potentiometer 191320 Note Some resistors may not have a color coding but they will have the value imprinted on them Note Resistor toler...

Page 15: ...es orange white red red brown see Figure E C1 22 F Lytic Capacitor see Figure F R27 2k 1 1 4W Res red blk blk brown brown see Figure E R28 1 3k 1 1 4W Res brn orange blk brn brn see Figure E R46 5 6k...

Page 16: ...of 1 10 amps If the tests are not working check for cold solder joints and part values Turn the meter off and remove the battery and test leads DO NOT PROCEED TO SECTION C WITHOUT YOUR INSTRUCTOR S AP...

Page 17: ...der the socket to the PC board Insert the IC into the socket with the notch as shown below Socket Notch C8 Figure I Mount the capacitor with the negative lead in the negative hole and the positive lea...

Page 18: ...own brown brown 141930 1 R40 4 12k 1 1 4W yellow brown red brown brown 144130 1 R9 9k 1 1 4W white black black brown brown 149030 1 R38 10k 1 1 4W brown black black red brown 151030 1 R43 11k 1 1 4W b...

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