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Summary of Contents for Elenco Electronics M-1008K
- Page 1 DIGITAL MULTIMETER KIT MODEL M-1008K Assembly and Instruction Manual ELENCO ® Copyright © 2012 by ELENCO ® All rights reserved. 753014 No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
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Page 2: Parts List
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 ® (address/phone/e-mail is at the back of this manual) for additional assistance, if needed. -
Page 3: Parts Identification
PARTS IDENTIFICATION RESISTORS MISCELLANEOUS Shunt wire Battery snap Carbon film Potentiometer Zebra Liquid crystal display (LCD) CAPACITORS Buzzer with wires Fuse holder Mylar Disc Electrolytic clip SEMICONDUCTORS Zebra frame 2.0mm x 2.0mm x 10mm Screws PC board Input socket Diode with ICs installed Transistor Transistor... - Page 4 • Tips should be cleaned frequently to remove oxidation before it becomes impossible to remove. Use Dry Tip Cleaner (Elenco ® #SH-1025) or Tip The most important factor in assembling your M-1008K Digital Multimeter Kit is Cleaner (Elenco ® #TTC1).
- Page 5 ASSEMBLY INSTRUCTIONS Identify and install the following parts as shown. After soldering each part, mark a check þ in the box provided. Be sure that solder has not bridged to an adjacent pad. NOTE: The 7106 IC1 is already installed C6 - 100pF (101) Discap on the PC board.
- Page 6 ASSEMBLY INSTRUCTIONS Identify and install the following parts as shown. After soldering each part, mark a check þ in the box provided. Be sure that solder has not bridged to an adjacent pad. Figure E R26 - 47kΩ 1% 1/4W Resistor Stand diode on end.
- Page 7 r Feed the battery snap wires up through the holes r Insert the LCD into the frame (the tab on the LCD in the PC board from the solder side as shown in must be in the same direction shown in Figure J). Figure F.
- Page 8 r Put the ball bearings into two opposite indents in r Place the PC board over the selector knob. Be the case top as shown in Figure M. sure that the 8-pin socket slides into its hole. Then fasten the PC board with five 6mm screws as r Place the six slide contacts on the selector knobs shown.
- Page 9 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. 1) ACV Range: HV 0 0 0 3) Ohms, Diode and h Ranges: B indicates blank.
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Page 10: Dc Volts Test
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. 10A DC 2) If you do not have a variable power supply, make the following two VΩmA tests: 1kΩ... -
Page 11: Continuity Test
RESISTANCE / DIODE TEST 2) Read the h of the transistor. The h 1) Measure a resistor of about half of the full scale transistors varies over a wide range, but you will value of each resistance range. Compare the kit probably get a reading between 100 and 300. -
Page 12: Theory Of Operation
THEORY OF OPERATION A block diagram of the M-1008K is shown in Figure 1. switches to produce an output DC voltage with a Operation centers around a custom LSI chip. This magnitude between 0 and 199mV. If the input signal... - Page 13 The integrate period begins at the end of the to be opposite that of the unknown input voltage, autozero period. As the period begins, the AZ switch thus causing the INTEG capacitor to discharge at a opens and the INTEG switch closes. This applies the fixed rate (slope).
- Page 14 BACKPLANE LCD PHASE DRIVER 7 Segment 7 Segment 7 Segment TYPICAL SEGMENT OUTPUT Decode Decode Decode 0.5mA LATCH Segment Output Tens Units Thousand Hundreds Internal Digital Ground To Switch Drivers From Comparator Output CLOCK 6.2V LOGIC CONTROL –4 TEST Internal Digital Ground 500Ω...
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Page 15: Dc Voltage Measurement
DC VOLTAGE MEASUREMENT 200mV Figure 4 shows a simplified diagram of the DC voltage Volts 900kΩ measurement function. The input voltage divider resistors Low Pass Filter add up to 1 megaohm. Each step down divides the voltage 90kΩ by a factor of ten. The divider output must be within the 7106 range –0.199 to +0.199 volts or the overload indicator will 9kΩ... -
Page 16: Continuity Measurement
CONTINUITY MEASUREMENT Figure 8 shows a diagram of the continuity measurement function. The circuit uses two op- amps and a piezoelectric buzzer. When the leads are connected across a circuit and the resistance less than 20Ω the circuit oscillates and the buzzer sounds. Figure 8 MEASUREMENT Figure 9 shows a simplified diagram of the h... -
Page 17: Meter Operation
METER OPERATION PRECAUTIONS AND PREPARATIONS FOR MEASUREMENT 1) Be sure the battery is connected to the battery 5) Operate the instrument only in temperatures snap and correctly placed in the battery between 0 and 50°C and in less than 80% RH. compartment. -
Page 18: Diode Check
D) 5.05kΩ +1%. r B) –1.199 to +1.199 volts. r C) –0.099 to +0.099 volts. 9. The M-1008K has . . . r D) –199 to +199 volts. r A) a 3 digit display. r B) a 3½ digit display. -
Page 19: Schematic Diagram
SCHEMATIC DIAGRAM -18-... - Page 20 ELENCO ® 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Website: www.elenco.com e-mail: elenco@elenco.com 050712...
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