Elenco Electronics M-2666K Instruction Manual

DIGITAL MULTIMETER KITMODEL M-2666KWIDE RANGE DIGITAL MULTIMETER WITHCAPACITANCE AND TRANSISTOR TESTING FEATURESAssembly and Instruction ManualElenco®

-9-RESISTOR READING EXERCISE(1) yellow-black-black-black-brown(3) brown-red-violet-red-brown(5) brown-black-black-black-brown(7) white-black-black-yel

-10-PARTS LIST - SECTION AIf you are a student, and any parts are missing or damaged, please see instructor or bookstore.If you purchased this kit fro

-11-ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARDIn all of the following steps the components must be installed either on the top or bottom legend

rAssemble the LCD into the housing with the partsshown in Figure F. Note the top of the house iscurved. rWipe off zebra edges with a lint-free cloth a

-13-PARTS LIST - SECTION BRESISTORSQty. Symbol Description Color Code Part #r 1 R23 .01Ω Shunt wire 100166r 1 R22 0.99Ω 0.5% 1/4W black-white-white-si

D1 - 1N4001 DiodeD2 - 1N4001 Diode(see Figure H)R19 - 900Ω .5% 1/4W Res.(white-blk-blk-blk-green)(see Figure I)R20 - 90Ω .5% 1/4W Res.(white-blk-blk-g

-15-rInsert the four input sockets into the PC boardholes and then solder the sockets in place.Apply enough heat to allow the solder to flowaround the

-16-PARTS LIST - SECTION CRESISTORSQty. Symbol Description Color Code Part #r 1 R38 1.87kΩ 1% 1/4W brown-gray-violet-brown-brown 141830r 1 R37 3kΩ 1%

-17-Top Legend SideR39 - 6.8kΩ 5% 1/4W Res.(blue-gray-red-gold)(see Figure I)C11 - 10μF Lytic Capacitor(see Figure B)VR2 - 200Ω Pot (201)R34 - 100kΩ 5

PARTS LIST - SECTION DRESISTORSQty. Symbol Description Color Code Part #r 1 R54 10kΩ 5% brown-black-orange-gold 151000r 1 R52 100kΩ 5% brown-black-yel

-1-INTRODUCTIONRangeSwitchesCurrentShuntsACConverterOhmsConverterVoltageDividerFunctionSwitchesA/DConverterandDisplayDriverDisplayDecimalPointDCAnalog

-19-PARTS LIST - SECTION ERESISTORSQty. Symbol Description Color Code Part #r 1 R29 10Ω 1% 1/4W brown-black-black-gold-brown 121030r 1 R28 90Ω 1% 1/4W

ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD-20-IC Socket 14-pinIC3 - LM324 Op-Amp IC(see Figure M)R45 - 150Ω 1% 1/4W Res.(brn-green-blk-blk-brn)

-21-Testing ProcedureCapacitance1. Place the top label over the knob and turn therange selector knob to a capacitance (C) scaleposition.2. Connect the

-22-r Solder the spring to the PC board as shown inFigure Q.r Install the bottom two 2.5 x 8mm screws to theLCD housing as shown in Figure R.r Peel of

-23-Top CaseInput SocketSleevesRed Power CapPC BoardBottom CaseShield LabelFigure TBlackFeed thebattery snapthrough thisopening.Battery Snap

-24-r Feed the battery snap wires through the slot onthe top case as shown in Figure U.r Connect the battery and place it in the cavity ofthe top case

-25-U1 (7106) Voltage Test1. Measure the voltage across pin 8 and pin 34 onU1 (7106) for 9V.A. Check the battery and SW1 connections.B. Check for a 9V

Amps Section1. μA/mA scale not working:A. Check fuse.B. Measure across (μA/mA) terminal and(COM) terminal and check the followingsettings:200μ = 1kΩ 2

-27-Table 1REINSTALLATION OF THE RANGE SELECTOR KNOBIf you removed the rotary selector knob fortroubleshooting, then follow the instructions below tor

-28-1. FEATURES• Wide measuring ranges: 34 ranges for AC/DC Voltage and Current, Resistance, Capacitance, TR hFE,Diode Test, and Continuity Buzzer.• 1

During autozero, a ground reference is applied as aninput to the A/D converter. Under ideal conditions theoutput of the comparator would also go to ze

-29-AC VoltageRange Resolution Accuracy Maximum Input200mV 100μV+1.5% of rdg + 2dgt2V 1mV +1% of rdg + 2dgt20V 10mV +1% of rdg + 2dgt AC 750V maximum

Transistor hFERange Test ConditionNPN 2mA 3VPNP 2mA 3VDiode TestMeasures forward resistance of a semiconductor junction in k Ohm at max. test current

(A) DC/AC Voltage Measurement1. Connect the red test lead to “VΩCAP” input jackand the black one to the “COM” jack.2. Turn the meter on by pressing th

-32-(E) Transistor hFEMeasurement1. The transistor must be out of circuit. Set therotary selector knob to the hFE position.2. Turn the meter on by pr

1. The function of the A/D converter is to . . .r A. convert digital to analog.r B. divide analog signal by 2.r C. convert analog to digital.r D. conv

-34-SCHEMATIC DIAGRAM

Elenco®Electronics, Inc.150 Carpenter AvenueWheeling, IL 60090(847) 541-3800Website: www.elenco.come-mail: [email protected]

-3-VOLTAGE MEASUREMENTFigure 3 Simplified Voltage Measurement DiagramFigure 4 Simplified Current Measurement Diagram200mVVolts9MΩ900kΩ90kΩ9kΩ9ΩCommo

-4-RESISTANCE MEASUREMENTSFigure 5 shows a simplified diagram of the resistance measurement function.Figure 5 Simplified Resistance Measurement Diagr

-5-Figure 8 7106 FunctionsababcdefgTYPICAL SEGMENT OUTPUT0.5mA2mAV+SegmentOutputInternal Digital GroundLCD PHASE DRIVERLATCH7 SegmentDecode7 SegmentD

-6-ASSEMBLYThe meter kit has been divided into a number ofsections to make the assembly easy and avoidmajor problems with the meter operation.ONLY OPE

-7-IntroductionThe most important factor in assembling your M-2666K Digital Multimeter Kit is good soldering techniques.Using the proper soldering iro

PART IDENTIFICATION CARDSTo help identify the resistors and diodes used in the construction of your digitalmultimeter we have mounted the diodes and r