Elenco Electronics M-1150K Instruction Manual

ANALOG MULTIMETERMODEL M-1150KAssembly and Instruction ManualElenco Electronics, Inc.Copyright © 1995 Elenco Electronics, Inc. Revised 1997

-9-OPERATING AND TESTING THE MULTIMETERCAUTION: When measuring an unknown voltage or current, always start with the range switch set to thehighest sca

AC Voltage TestIn reading AC voltage, it is necessary to obtain a known source of AC. A 12 volt transformer is preferred.If one is not available, use

-11-Diode TestsThe diode forward current If and reverse current Ir are read LI scale. To check a diode in the forward direc-tion proceed as follows:1

DC Current MeasurementFigure 11 shows a simplified diagram of the DC current measuring circuit. Here the resistors are placedacross the meter to shun

-13-hFEMeasurementFigure 13 shows a simplified diagram of the hFE measuring circuit. Here the range switch is in the X10 ohmsposition and the transis

SCHEMATIC DIAGRAM-14-

Elenco Electronics, Inc.150 W. Carpenter AvenueWheeling, IL 60090(847) 541-3800http://www.elenco.comE-mail: [email protected]

PARTS LISTRESISTORSQTY SYMBOL VALUE COLOR CODE PART #r 1R26 .025Ω Shunt Wire 100269r 1 R12 .96Ω 1% 1/2W black-white-blue-silver-brown 109631r 1R11 10Ω

-2-CONSTRUCTIONIntroductionAssembly of your M-1150 Analog Multimeter Kit will prove to be an exciting project and give you much satisfaction and perso

-3-ASSEMBLE COMPONENTS TO THE PC BOARDAfter each step, put a check in the box located next to the step that you have completed.r Insert the three inpu

-4-Figure FBattery snap - Insert red or white wirethrough the hole marked B2+ and black orblue wire through hole marked B2--. Thensolder

-5-ASSEMBLE COMPONENTS TO THE PC BOARDr Solder the shunt wire into the R26 (.025Ω) position on the PC board as shown in Figure 2. The leads should ex

-6-INSTALL THE FOLLOWING PARTSr Install the double battery contact as shown in Figure 5.r Install the two single battery contacts as shown in Figure 5

-7-CALIBRATIONMeter Calibration (See Operating and Testing the Multimeter Section for meter operating instructions).1.Obtain a voltage source of 0.1V

TROUBLESHOOTING CHARTThis chart lists the condition and possible causes of several malfunctions. If a particular part is mentionedas a possible cause