Elenco Digital Mulitmeter Kit Manual do Utilizador Página 1

DIGITAL MULTIMETER KITMODEL M-1007KAssembly and Instruction ManualElenco®Electronics, Inc.Copyright © 2008 by Elenco®Electronics, Inc. All rights res

AC VOLTS TESTTo 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 worki

-10-RESISTANCE/DIODE TEST1) Measure a resistor of about half of the full scale value of each resistance range. Compare the kit meterreadings to those

-11-THEORY OF OPERATIONA block diagram of the M-1007K is shown in Figure 1. Operation centers around a custom LSI chip. This chipcontains a dual slope

-12-The integrate period begins at the end of theautozero period. As the period begins, the AZ switchopens and the INTEG switch closes. This applies t

-13-Figure 27106 IC FunctionsFigure 3ababcdefgTYPICAL SEGMENT OUTPUT0.5mA2mAV+SegmentOutputInternal Digital GroundLCD PHASE DRIVERLATCH7 SegmentDecode

-14-DC VOLTAGE MEASUREMENTFigure 4 shows a simplified diagram of the DC voltagemeasurement function. The input voltage divider resistorsadd up to 1 me

DIODE CHECKRANGE RESOLUTION MAX TEST CURRENT MAX OPEN CIRCUIT VOLTAGEDIODE 1mV 1.4mA 2.8VTRANSISTOR hFE TESTRANGE TEST RANGE TEST CURRENT TEST VOLTAGE

-16-METER OPERATIONPRECAUTIONS AND PREPARATIONS FOR MEASUREMENT1) Be sure the battery is connected to the battery snap and correctly placed in the bat

-17-RESISTANCE MEASUREMENTS1) Connect the black test lead to the “COM” terminal.2) Connect the red test lead to the “VΩmA” terminal.3) Set the range s

-18-SCHEMATIC DIAGRAM

PARTS LISTIf you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchasedthis meter kit from a distri

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

-2-IDENTIFYING RESISTOR VALUESUse the following information as a guide in properly identifying the value of resistors.5 Bands1 2MultiplierToleranceRes

-3-CONSTRUCTIONSolderSoldering IronFoilSolderSoldering IronFoilComponent LeadSoldering IronCircuit BoardFoilRosinSoldering iron positionedincorrectly.

-4-ASSEMBLY INSTRUCTIONSIdentify and install the following parts as shown. After soldering each part, mark a check þ in the box provided.Be sure that

Figure CMount the transistorwith the flat side inthe same directionas the marking onthe PC board asshown.Install the following parts. Then, mark a che

Figure ISpringSolder padon PC board-6-Close-up view of thetransistor socket andPC board.Solder SideFigure ETabInput SocketsShunt WireRed WireBlack Wir

r Put the bearings into two opposite indents in the case top as shown in Figure K.r Place the six slide contactors on the selector knobs as shown in F

CALIBRATIONRefer to the METER OPERATION section for test lead connections and measurement procedure.A/D CONVERTER CALIBRATIONTurn the range selector s