Data Sheet - Hobby Engineering
Contents
1. RESISTORS Qty Symbol Description Color Code Part 2 RA4R5 100kQ 5 1 4W brown black yellow gold 161000 1 R3 200kQ 5 1 4W red black yellow gold 162000 01 RI 220kQ 5 1 4W red red yellow gold 162200 3 R8 R9 470kQ 5 1 4W yellow violet yellow gold 164700 2 R2 R6 1 5 1 4W brown black green gold 171000 CAPACITORS Qty Symbol Value Description Part 1 C5 100pF 101 Disc 221017 O1 C1 1uF 104 Mylar large brown 251017L 2 4 pF 104 Mylar small yellow 2510175 1066 22uF Electrolytic Lytic 2722448 SEMICONDUCTORS Qty Symbol Value Description Part 1 Tl1 9013 Transistor 2SC9013 329013 MISCELLANEOUS Qty Description Part Qty Description Part 1 LCD 351166 1 Battery Snap Batt 590098 1 Zebra 500007 1 LCD Housing 629015 1 PC Board M2666K 512666 1 LCD Cover 629016 11 Switch On Off SW1 540004 1 Label Top 723051 01 Battery 9V 590009 1 Solder 9ST4A PARTS IDENTIFICATION PC Board Liquid Crystal Display LCD Label Top Capacitors Display C1 F ge A UE Display Housing 10 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following steps the components must be installed either on the top or bottom legend sides of the PC board as indicated The board is turned to solder the component leads on the opposite side installed on Bottom soldered on Top installed on To2. D 5 05 1 9 When checking a transistor the selector knob should be in the A farad position B ohm position C diode position D hre position 10 Where do the leads need to be on the meter when measuring 450mA A 10A COM B VOCAP COM C 10A D uA mA COM 0 46 0 8 4 9 0 6 9 0 1 53 Elenco Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com e mail elenco elenco com Pe Ga Gite
3. REINSTALLATION OF THE RANGE SELECTOR KNOB If you removed the rotary selector knob for troubleshooting then follow the instructions below to reinstall it Place the PC board over the range selector knob and fasten the knob to the PC board with a M2 3 x 8 screw CAUTION Do not over tighten the screw The knob should be snug but not loose Turn back the M2 3 x 8 screw 1 2 turn Slip the two shims under the knob see Figure W 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 now have the proper tension to hold the knob and contacts in place and rotate the knob to the desired positions Qty Description Part 1 Selector Switch 2 psc 622666 2 Selector Pin 622666A 6 Slide Contacts 622666B 4 Screws Selector Switch M1 8 x amm 622666 USING THE DIGITAL MULTIMETER Familiarize yourself with your new digital meter by taking readings of known resistances and voltages You will find that the readings will not be as accurate on certain ranges for a given measurement For example when measuring a low resistance on a high range the reading will show a short 0 00 When measuring a high resistance on a low range Likewise MEASURED RESISTANCE 2000 SHORT LEADS TOUCHING INFINITY the reading will show infinity 1 it is 2700 RESISTANCE OF TEST LEADS Table 2 Slide Contact Spring SS 2 Bottom V
4. 1kQ 2m 1000 20m 100 200m 12 1 Lower or higher check R19 R23 2 10A scale not working A Check shunt Capacitance Section 1 Connect the 1uF cap to the meter and check pin 14 and pin 1 of U2 with a scope meter set to 2N Pin 14 350Hz 400Hz 5Vpp Net Nf Xa Pin 1 350Hz 400Hz 14Vpp A No signal at 14 1 Check R40 R43 C12 C13 and IC3 B No signal at pin 1 but present at pin 1 1 Check R44 R45 VR1 D6 and D7 Pin 8 350Hz 400Hz 3Vpp C No signal at pin 8 1 Check R46 R48 D8 D9 C14 and C15 26 he Section 1 Check for shorts on socket pins 2 Measure across base B terminal to COM terminal for 209kO to 231kQ A Lower or higher than value Check R49 NPN and R50 PNP Decimal Point Section 1 Displays two decimal points A Shorted resistors R7 R9 2 No decimal points displayed A Check R7 R9 Diode 1 Measure voltage across V OHM and COM terminal set in diode mode 3V A Low voltage check R51 R53 and R54 Buzzer U2 Voltages Pin 1 of IC2 1 5kHz 1 6Vpp 6V 1121314 5 16 v e 910 Di CI Bi at Gi ei D2 PIN 14 15 1 18 19 20 11 12 13 5 16 17 18 C2 B2 A2 F2 G2 E2 D3 C3 BS PIN 21 22 23 24 25 26 27 28 29 30 COM F3 G3 ES BC4 gt BAT DH COM
5. R10 R24 R30 R33 VR1 and the transistor T2 4 Turn the meter off and remove the battery top label and test leads DO NOT PROCEED TO SECTION C WITHOUT YOUR INSTRUCTOR S APPROVAL 5 Remove two display mounting screws and display by unscrewing the two mounting screws 15 SECTION C AC Voltage amp Current Circuit PARTS LIST SECTION C RESISTORS Qty Symbol Description Color Code Part 1 R38 1 87 1 1 4W brown gray violet brown brown 141830 1 R37 1 1 4W orange black black brown brown 143030 1 R39 6 8kQ 5 1 4W blue gray red gold 146800 1 R34 100kQ 5 1 4W brown black yellow brown 161000 2 R35 R36 100kQ 1 1 4W brown black black orange brown 161030 1 VR2 2000 Trim Pot 191320 Note Resistor tolerance last band of 5 band resistors may be blue instead of green CAPACITORS Qty Symbol Value Description Part 1 C7 470pF 471 Disc 224717 1 C10 334 Mylar large brown 2533181 2 C8 C9 Electrolytic Lytic 2647475 1 C11 10uF Electrolytic Lytic 271015S SEMICONDUCTORS Qty Symbol Value Description Part 4 03 05 1N4148 Diode glass 314148 1 I 2 LM324 Am 24 MISCELLANEOUS Qty Symbol Value Description Part ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOAR Figure L Stand diode on end Mount with band as shown on the top legend R37 3kO 196 1 4W Res ma tribe EL G
6. 0 199V which is then processed in the 7106 IC to light the appropriate LCD segments If the current is AC in nature the AC converter changes it to the equivalent DC value Low Pass Filter Figure 4 Simplified Current Measurement Diagram RESISTANCE MEASUREMENTS Figure 5 shows a simplified diagram of the resistance measurement function External Resistor Low Pass Filter 7106 Ref Voltage Source Figure 5 Simplified Resistance Measurement Diagram A simple series circuit is formed by the voltage source a reference resistor from the voltage divider selected by range switches and the external unknown resistor The ratio of the two resistors is equal to the ratio of their respective voltage drops Therefore since the value of one resistor is known the value of the second can be determined by using the voltage drop across the known resistor as a reference This determination is made directly by the A D converter hre MEASUREMENT Figure 6 shows a simplified diagram of the hre measurement function Internal circuits in the 7106 IC maintain the COMMON line at 2 8 volts below V When a PNP transistor is plugged into the transistor socket base to emitter current flows through resistor R49 The voltage drop in resistor R49 due to the collector current is fed to the 7106 and indicates the hre of the transistor For an NPN transistor the emitter current through R50 indicates the hee of the transistor CAPACIT
7. LCD Cover Notch 7 LCD Do not touch edge Zebra LCD Housing Battery PC Board Range Selector Knob Assembly 12 Testing Procedure The LCD housing will not be screwed to the PC board for this test Align the LCD housing holes with those in the PC Board and hold in place You can also use a rubber band to hold the housing You will need to apply pressure so the zebra makes contact to the copper pads 1 Place the top label over the knob This will assist in obtaining the correct knob position 2 Connect the 9V battery to the battery snap 3 Turn the meter on by pressing the power switch down position 4 Align the LCD housing holes with those in the PC Board and hold in place You can also use a rubber band to hold the housing You will need to apply pressure so the zebra makes contact to the copper pads 5 Set the selector switch to the 2000 position The first decimal point should light and show a 200 under it Select the 20kO position and the second decimal points lights with a 20 under it Select the 2kO position and the second decimal points lights with a 2 under it Adjust the selector to other ranges and check that correct decimal point lights The LCD will display random numbers If the tests are not working check for cold solder joints part values and if the LCD is assembled correctly DO NOT PROCEED TO SECTION WITHOUT INSTRUCTOR S APPROVAL Figur
8. orange blk blk brn brn Assembled View see Figure D4 1N4148 Diode D5 1N4148 Diode see Figure L C8 4 7uF Lytic Capacitor M cl E C9 4 7uF Lytic Capacitor see Figure B we see Figure B n Il ale R35 100kQ 1 1 4W Res eM DE z brown blk blk yellow brown see Figure R36 100 1 1 4W Res NS Hin HES brown blk blk yellow brown C7 470pF 471 Discap i LIT see Figure l R38 1 87kO 1 1 4W Res brn gray violet brn brn see Figure may be marked 334 03 1N4148 Diode see Figure L R39 6 8 5 1 4W Res blue gray red gold see Figure Figure M Insert the IC socket into the PC board with the notch in the same direction marked on the top legend kee de DET THES 211 C11 10uF Lytic Capacitor Solder the IC socket into place Wet ira i see Figure B Insert the IC into the socket with the E 5 a notch in the same direction as the 2 i N VR2 200Q Pot 201 BIB R34 100kQ 5 1 4W Res 57 brown black yellow brown see Figure IC Socket 14 pin IC2 LM324 Op Amp see Figure M PC Board Assembled View SECTION D Resistance amp Buzzer Circuit PARTS LIST SECTION D
9. If the resistance being measured is connected to a circuit turn off the power to the circuit being tested and discharge all capacitors Connect the test leads to the circuit being measured When measuring high resistance be sure not to contact adjacent point even if insulated because some insulators have a relatively low insulation resistance causing the measured resistance to be lower than the actual resistance Read resistance value on digital display D Diode Test 1 Connect the red test lead to VOCAP input jack and the black one to the jack Turn the meter on by pressing the power switch Set the range selector knob to the gt position 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 capacitors Connect the test leads to the device and read forward value on the digital display If the digital reads overrange 1 reverse the lead connections The placement of the test leads when the forward reading is displayed indicates the orientation of the diode The red lead is positive and the black lead is negative If overrange 1 is displayed with both lead connections the junction is open E Transistor hre Measurement 1 The transistor must be out of circuit Set the rotary selector knob to the hre position 2 Turn the meter on by pressing the power sw
10. RESISTORS Qty Symbol Description Color Code Part 1 R54 10kQ 5 brown black orange gold 151000 1 R52 100kQ 5 brown black yellow gold 161000 2 R55 R57 330kQ 5 orange orange yellow gold 163300 4 R51 53 56 58 1MQ 5 brown black green gold 171000 1 PTC 1 5kQ Thermister 190416 CAPACITORS Qty Symbol Value Description Part 2 C16 C17 001uF 102 Discap 231036 MISCELLANEOUS Qty Symbol Value Description Part 1 Buz Buzzer 20mm dia 595220 17 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD R58 1MQ 5 1 4W Res R51 1MQ 5 1 4W Res brown black green gold see Figure R55 330kQ 5 1 4W Res orange orange yellow gold see Figure R52 100 5 1 4W Res brown black yellow gold see Figure R54 10kQ 5 1 4W Res brown black orange gold see Figure er ot iat LL BUZ Buzzer see Figure N R56 1MQ 5 1 4W Res brown black green gold see Figure 1 Bottom Legend Side C17 001 102 Discap C16 001uF 102 Discap R57 330kQ 5 1 4W Res orange orange yellow gold see Figure R53 1MQ 5 1 4W Res brown black green gold see Figure 1 5kQ Thermister Figure N Solder the buzzer to the PC board in the locations shown Then solder a discarded resistor lead to the middl
11. S SOROR DIGITAL SECTION CROSSING DETECTOR TO DIGITAL SECTION Figure 8 7106 Functions 1CL7106 ICL7107 MQFP TOP VIEW z 2 2 lt 5 42 41 40 EN 2 21221162 testT CLJ 3 osc 4 NCCLCL 5 29 I3693 osc2L 1T 6 28 BP GND osc itr 27 8 26117 asa D1 251 E3 1 m mm 24 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 ONLY OPEN 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 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 amp Buzzer Circuit Assembly Section E Capacitance and Transistor Circuit Assembly Section F Final Assembly IMPORTANT CONSTRU
12. T 0 166 7mS 3 0 COUNTER OUTPUT T 500 1000 1500 2000 Figure 2 Dual Slope A D Converter During autozero a ground reference is applied as an input to the A D converter Under ideal conditions the output of the comparator would also go to zero However input offset voltage errors accumulate in the amplifier loop and appear at the comparator output as an error voltage This error is impressed across the AZ capacitor where it is stored for the remainder of the measurement cycle The stored level is used to provide offset voltage correction during the integrate and read periods The integrate period begins at the end of the autozero period As the period begins the AZ switch opens and the INTEG switch closes This applies the unknown input voltage to the input of the A D converter The voltage is buffered and passed on to the input of the A D converter The voltage is buffered and passed on to the integrator to determine the charge rate slope on the INTEG capacitor At the end of the fixed integrate period the capacitor is charged to a level proportional to the unknown input voltage This voltage is translated to a digital indication by discharging the capacitor at a fixed rate during the read period and counting the number of clock pulses that occur before it returns to the original autozero level As the read period begins the INTEG switch opens and the read switch closes This applies a k
13. and SW1 connections B Check for a 9V and GND short 1 One of the ICs may be bad Remove one IC at a time and check voltage again between pins 8 and 34 2 Measure the voltage from pin 8 to COM on U1 for 3V A U1 is defective 3 Check the Main Oscillator on U1 7106 pins 6 7 and 4 Pin 6 Ed I Pin 4 4 Measure the voltage from pin 44 to COM on U1 7106 0 1V A Adjust VR1 so the the junction of R31 R33 and VR1 equal to 100mV 1 Can t set to 100mV a VR1 wrong value or defective b R30 R32 wrong value perform the tests that pertain to the Function that is not working on your meter Voltage OHM Section 1 Measure across VOCAP terminal and COM terminal for 10MQ set meter in 200mV battery installed A Lower or higher than 10MQ 1 Check resistors R10 R18 2 LCD readings floating A Measure from COM terminal to pin 43 on U1 7106 for 220kQ 1 R3 open or defective AC Voltage Section 1 Apply 15VAC to meter and measure pin 14 of U2 324 to COM terminal with a scope meter on 20VAC scale Pin 14 to COM 2Vpp A Check 2 and R34 2 Check junction R39 and C11 of U1 7106 with a scope Waveform for junction R39 and C11 03Vpp 16Vpp OV A Check R35 R39 C7 C11 D3 D5 and VR2 25 Amps Section 1 scale not working A Check fuse B Measure across uA mA terminal and COM terminal and check the following settings 200
14. shown in Figure 1 Operation centers around a custom LSI chip This IC contains a dual slope A D converter display latches decoder and the display driver A block diagram of the IC functions is shown in Figure 6 The input voltage current or ohm signals are conditioned by the function and selector switches to produce and output DC voltage between 0 and 199mV f the input V Voltage V Divider Q Ohms Q Converter VAC mA mA Range Switches AC Converter mA Current Shunts signal is 100VDC it is reduced to 100mV DC by selecting a 1000 1 divider Should the input be 100VAC then after the divider it is processed by the AC converter to produce 100mVDC If current is to be read it is converted to a DC voltage via internal shunt resistors For resistance measurements an internal voltage source supplies the necessary 0 199mV voltage to be fed to the IC input Converter and Display Driver Function Switches 1028 Display Figure 1 Simplified Block Diagram The input of the 7106 IC is fed to an A D analog to digital converter Here the DC voltage amplitude is changed into a digital format The resulting signals are processed in the decoders to light the appropriate LCD segment Timing for the overall operation of the A D converter is derived from an external oscillator whose frequency is selected to be 40kHz In the IC this frequency is divided by four before it clocks the decad
15. 131050 133930 139030 139050 145600 149050 151330 159050 169050 172250 191320 Part 314001 329013 Part 530020 642239 663004 664066 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following steps the components must be installed either on the top or bottom legend sides of the PC board as indicated The board is turned to solder the component leads on the opposite side installed on Bottom soldered on Top installed on Top soldered on Bottom Figure H Stand diode on end Mount with band as shown on the top legend White marking on PC board R15 90kQ 5 1 4W Res white blk blk red green see Figure R14 900kQ 5 1 4W Res white blk blk orange green see Figure R10 2 25MQ 5 1 4W Res R11 2 25MQ 5 1 4W Res R12 2 25MQ 5 1 4W Res R13 2 25MQ 5 1 4W Res red red green yellow green see Figure R18 1000 5 1 4W Res brown blk blk bIk green see Figure R17 9000 5 1 4W Res white blk blk blk green see Figure T2 9013 Transistor see Figure C R16 5 1 4W Res green blue red gold white blk blk brown green see Figure N see Figure R30 13kO 1 1 4W Res i 1 TI C Emm R23 Shunt Wire brn orange blk red brn see Figure 1 St fp tt i 1 4 PC Board R31 9002 1 1 4W Res 1 ats Fuse Holder Clips white blk blk blk brown see Figure VR1 2000 Po
16. 2mA 3V PNP 2mA 3V Diode Test Measures forward resistance of a semiconductor junction in k Ohm at max test current of 1mA 3 OPERATION 3 1 Preparation and caution before measurement 1 If the function must be switched during a 4 order to prevent damage or injury to the unit measurement always remove the test leads never fail to keep the maximum tolerable voltage from the circuit being measured and current especially for the 20A current range 2 If the unit is used near noise generating 5 Carefully inspect the test lead If damaged equipment be aware that the display may discard and replace become unstable or indicate large errors 3 Avoid using the unit in places with rapid temperature variations 3 2 Panel Description LCD Display 2 On Off Switch Input Socket Range Selector Knob 20A Input Jack 7 NEL Vit Ohm Cap Input Jack FEREN COLL UNE sl 200mA Max A input Jack ELENCO M 2666K Common Input Jack 30 3 3 Method of Measurement A DC AC Voltage Measurement 1 Connect the red test lead to VOCAP input jack and the black one to the COM jack Turn the meter on by pressing the power switch Set the range selector knob to the desired volt position If the magnitude of the voltage is not known set the range selector knob to the highest range and reduce until a satisfactory reading is obtained Connect the tes
17. ANCE MEASUREMENT The capacitor circuit consists of four op amps IC3 D amp A form an oscillator which is applied to the test capacitor through the test leads The capacitor couples the oscillator to pin 6 of IC3B The amount of voltage developed at pin 6 is indicative of the capacitors ESR value and C amplify the signal which is seen at pin 8 The AC signal is then converted to a DC voltage and displayed on the meter 4 Overall operation of the A D converter during a resistance measurement is basically as described earlier in this section with one exception The reference voltage present during a voltage measurement is replaced by the voltage drop across the reference resistor This allows the voltage across the unknown resistor to be read during the read period As before the length of the read period is a direct indication of the value of the unknown C PNP NPN Low Pass Filter Figure 6 1400104 Figure 7 CO gt LI BACKPLANE nud 7 Segment 7 Segment 7 Segment 200 Decode Decode Decode V4 1 TYPICAL SEGMENT OUTPUT V Segment Output gt 3 I To Switch Drivers From Comparator Output Q v 1 1 LOGIC CONTROL 6 2V 1 Internal Digital Ground TEST Internal Digital Ground 3944 5000 Q 1 Three inverters LJ 1 One inverter shown for clarity 34 Bas es X NRI
18. Be sure that there is adequate ventilation present Assemble Components In all of the following assembly steps the components must be installed on the top side of the PC board unless otherwise indicated The top legend shows where each component goes The leads pass through the corresponding holes in the board and are soldered on the foil side Use only rosin core solder of 63 37 alloy DO NOT USE ACID CORE SOLDER What Good Soldering Looks Like Types of Poor Soldering Connections A good solder connection should be bright shiny smooth and uniformly flowed over all surfaces 1 Solder all components from Soldering Iron Insufficient heat the the copper foil side only solder will not flow onto the Push the soldering iron tip lead as shown against both the lead and the circuit board foil 222222224 222 Component Lead Soldering iron positioned incorrectly Circuit Board Insufficient solder let the Soldering Iron solder flow over the connection until it is covered Use just enough solder to cover the connection 2 Apply a small amount of solder to the iron tip This allows the heat to leave the iron and onto the foil Immediately apply solder to the opposite side of the connection away from the iron Allow the heated component and the circuit foil to melt the solder Excessive solder could make connections that you Solder did not intend to between adjacent foil areas 3 Allow the solder to fl
19. CTION 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 CONSTRUCTION Introduction The most important factor in assembling your M 2666 Digital Multimeter Kit is good soldering techniques Using the proper soldering iron is of prime importance A small pencil type soldering iron of 25 40 watts is recommended The tip of the iron must be kept clean at all times and well tinned Safety Procedures Wear eye protection when soldering Locate soldering iron in an area where you do not have to go around it or reach over it Do not hold solder in your mouth Solder contains lead and is a toxic substance Wash your hands thoroughly after handling solder
20. DIGITAL MULTIMETER KIT MODEL M 2666K WIDE RANGE DIGITAL MULTIMETER WITH CAPACITANCE AND TRANSISTOR TESTING FEATURES 7 56619 ill 9 T 208 COM mee 1 OS 5 T T waa 1 ELENCO 2666 Assembly and Instruction Manual Elenco Electronics Inc 522 AA d Electronics Inc All rights 753128 reproduced by any means electronic photocopying or otherwise without written permission from the publisher INTRODUCTION Assembly of your M 2666 Digital Multimeter Kit will prove to be an exciting project and give much satisfaction and personal achievement If you have experience 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 and follow the easy step by step instructions Remember An ounce of prevention is worth a pound of cure The meter kit has been divided into a number of sections to make the assembly easy and avoid major problems with the meter operation 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 amp buzzer circuit assembly Section E Capacitance and transistor testing circuit assembly Section F Final assembly THEORY OF OPERATION A block diagram of the M 2666K is
21. anation in the operating instructions to avoid damage to the equipment and or to avoid personal injury This WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury This 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 marking advises the user that the terminal s so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds in this case 500 volts This symbol adjacent to one or more terminals identifies them as being associated with ranges that may in normal use be subjected to particularly hazardous voltages For maximum safety the instrument and its test leads should not be handled when these terminals are energized 32 SCHEMATIC DIAGRAM 33 e E 04 59 Ed 29 CHI ed gt gd Ed Ca cg C I T o5 UND 53000 5X GOO Ke mooz mos me ADT 9 0007 4005 2 Az AMONG AOV V9 YN Augg ug 002 2 vuoz 002 002 02 40402 Ac 00 002 dV WHO dd QUIZ 1 The function of the A D converter is to 6 Resistance measurements are made by A convert digital to a
22. ange blk brn brn ORNA uc I see Figure 1 TH ZA zi 2 42 1 91kO 1 1 4W Res rte m J brn white brn brn brn Tee R44 10kO 1 1 4W Res see Figure brn blk blk red brn R40 39kO 196 1 4W Res see Figure P R41 39kQ 196 1 4W Res C13 01uF 103 Mylar Cap orange white blk red brn see Figure 1 C12 01uF 103 Mylar Cap R49 220kQ 5 1 4W Res R50 220 5 1 4W Res red red yellow gold see Figure D8 1N4001 Diode D9 1N4001 Diode see Figure O Figure O Stand diode on end Mount with band as shown on the top legend D9 Bottom Legend Side 20 Assembled View for Section B O Attach the LCD to the PC board using the two 2 5 x 8mm screws Use the top mounting hole and lightly tighten the screws Testing Procedure Capacitance 1 Place the top label over the knob and turn the range selector knob to a capacitance C scale position 2 Connect the 9V battery to the battery snap 3 Connect the sho
23. ckets Screws Figure J Testing Procedure Voltage Test Current Test 1 Place the top label over the knob and turn the 1 Turn the range selector knob to the 200uA range selector knob to the 20V position position 2 Connect the 9V battery to the battery snap 2 Connect the test leads red lead to and 3 Connect the test leads red lead to VOCAP and black to COM black to COM Turn the meter on by pressing the 3 Connect the kit meter and another meter of power switch known accuracy in series Set the both meters in the 200uA position Construct a circuit for a DC current for example 9V and a 47kQ resistor for 190 and measure the circuit Both meters should have close to the same readings Check the other DC current 2mA 200mA scales The 20A scale requires a circuit of 1 20 amps 4 Using another meter of known accuracy measure a DC voltage less than 20V such as a 9 volt battery You will calibrate the kit meter by measuring the same voltage source and adjusting VR1 until the kit meter reads the same as the accurate meter When the two meters agree the voltage circuit is calibrated Turn the meter off and continue to the Current Test If the meters do not agree check the parts just added Do not readjust VR1 for this will change the voltage reading set in step 1 If the tests are not If the tests are not working check components aie working check for cold solder joints and part values
24. e G SECTION B DC Voltage amp Current Circuit PARTS LIST SECTION B Qty Symbol Description 1 R23 010 01 R22 0 990 0 5 1 4W 1 Rat 90 0 5 1 4W 1 R20 902 0 5 1 4W 01 18 1000 0 5 1 4W 1 R32 3900 196 1 4W 1 R31 9000 1 1 4W O2 R17 R19 9000 0 5 1 4W 1 R33 5 6kQ 5 1 4W 1 R16 0 5 1 4W 1 R30 13kQ 1 1 4W 1 R15 90kQ 0 5 1 4W 1 R14 900 0 5 1 4W 4 R10 R13 2 25MQ 0 5 1 4W 1 2000 201 RESISTORS Color Code Shunt wire black white white silver green white black black silver green white black black gold green brown black black black green orange white black black brown white black black black brown white black black black green green blue red gold white black black brown green brown orange black red brown white black black red green white black black orange green red red green yellow green Pot lay down Note Resistor tolerance last band of 5 band resistors may be blue instead of green Qty Symbol 2 01 02 01 T2 Qty Symbol 1 2 12 4 SEMICONDUCTORS Value Description 1N4001 Diode 25 9013 9013 MISCELLANEOUS Description Fuse 0 2A 250V 5 x 20mm Screw 2 5 x 8mm Fuse Clips Input Socket 10A uA mA COM PARTS IDENTIFICATION Pot lay down Fuse Fuse Clip Input Socket CO Shunt Wire 13 Part 100166 109950 119050 129050
25. e counters It is further divided to form the three convert cycle phases The final readout is clocked at about three readings per second Digitized measurements data is presented to the display as four decoded digits seven segments plus polarity Decimal point position on the display is determined by the selector switch setting A D CONVERTER A simplified circuit diagram of the analog portion of the A D converter is shown in Figure 2 Each of the switches shown represent analog gates which are operated by the digital section of the A D converter Basic timing for switch operation is keyed by an external oscillator The conversion process is continuously repeated A complete cycle is shown in Figure 2 Any given measurement cycle performed by the A D BUFFER AMP EXTERNAL INPUTS REF FLYING CAPACITOR UNKNOWN INPUT VOLTAGE AZ converter can be divided into three consecutive time periods autozero AZ integrate INTEG and read Both autozero and integrate are fixed time periods A counter determines the length of both time periods by providing an overflow at the end of every 1 000 clock pulses The read period is a variable time which is proportional to the unknown input voltage The value of the voltage is determined by counting the number of clock pulses that occur during the read period COMPARATOR INTEGRATOR gt gt INTEG AZ TO DIGITAL CONTROL LOGIC 10 000
26. e of the buzzer and to the point shown on the PC board Finally solder the edge of the buzzer to the other point shown on the PC board Solder Points Discarded Resistor ix s Solder e j Solder Points PC s Attach the LCD to the PC board using the two 2 5 x 8mm screws Use the top mounting hole and lightly tighten the screws The screws will be removed to assemble the next section Testing Procedure 1 Place the top label over the knob and turn the range selector knob to an OHM scale position 2 Connect the 9V battery to the battery snap 3 Connect the test leads red lead to VO CAP and black to COM Turn the meter on by pressing the power switch 4 Test the Ohms Buzzer and Diode functions using the procedures below OHMs Using two or three different value resistors check each scale Compare the kit meter readings with another meter of known accuracy If the tests are not working check the solder of the PTC Buzzer Set the selector knob to the Buzzer em position Short the red and black leads and the buzzer should sound If the buzzer does not sound check components R51 R58 PTC C16 C17 and the solder connections to the buzzer Diode Connect a diode to the test leads with the correct polarity see figure below The meter will range for 100 950 COM gt VQ 5 Turn the meter off and remove the battery top label and test leads 6 Remove two display mounting screws and di
27. e value from the wrong end project you should be thoroughly familiar with the 5 Do the following exercise in resistor values Place band color code system Many of the resistor your answer in the box beneath the resistor values will be identified by color bands and it is easy Answers are on the bottom of this page to mistake their value if you read the colors 1 yellow black black black brown 2 white black black red green 1 3 brown red violet red brown 4 green black green brown green 1 5 brown black black black brown 6 brown green gray orange brown 1 1 7 white black black yellow green 8 white black black silver green 1 9 brown black black orange green 10 orange white red red brown 11 gray white black black brown 12 brown brown black red brown ZL 1 0068 LL 1 0 6 01 9687 09001 6 6 06 8 99 FUNG 1 0 861 9 19007001 9 G FOAGO S v 96 L 07 21 968 0706 15000 1 101siseH 0 Siamsuy SECTION A Meter Display Circuit PARTS LIST SECTION A If you are a student and any parts are missing or damaged please see instructor or bookstore If you purchased this kit from a distributor catalog etc please contact Elenco Electronics address phone e mail is at the back of this manual for additional assistance if needed DO NOT contact your place of purchase as they will not be able to help you
28. ed already FINAL ASSEMBLY Solder the spring to the PC board as shown in Figure Q Install the bottom two 2 5 x 8mm screws to the LCD housing as shown in Figure R Peel off the protective backing on the top label A and bottom label B and stick them to the top case as shown in Figure S Place the PC board into the bottom case Feed the battery clip through the case as shown in Figure T Place the four colored sleeves over the input Sockets as shown in Figure T Note that the black sleeve goes on the COM socket 2 5 x amm Screws Qur Figure R 22 Qty Description Part 2 Screw Case 17 5mm 642240 1 Spring 680033 1 Label Bottom 723052 1 Shield Label 780012 1 Holster 9C72 1 TestLeads Alligator 9TL13 01 Test Leads Red Black 9TL14 Place the red power cap onto the switch SW1 as shown in Figure T Spring Solder Figure Q Bottom Label B Top Label A Figure S Figure T Top Case Input Socket lt Sleeves Feed the battery snap through this opening Red Power Cap Bottom Case FINAL ASSEMBLY continued Feed the battery snap wires through the slot on the top case as shown in Figure U Connect the battery and place it in the cavity of the top case as shown in Figure V Battery Snap Wires Figure U Testing Procedure SECTION C AC voltage a
29. iew of Selector Knob amp Slide Contacts i Qty Description Part 4 Nut Selector Switch M1 8 622666D 2 Ball Bearing 622666E 2 Spring Selector 622666F important to use the correct range when measuring voltages Table 1 shows an example of the readouts for different values of resistance Table 2 shows an example of the readouts for 117VAC and 100VDC The shaded area indicates the most accurate range It must be remembered that the readings will shift slightly when switching to a different range RANGE SETTING 20kQ 200 2MO Table 1 MEASURED VOLTAGE 200mV 2V 20V 200V 1000V 27 1 FEATURES e Wide measuring ranges 34 ranges for AC DC Voltage and Current Resistance Capacitance TR hre Diode Test and Continuity Buzzer 10MQ Input Impedance Big LCD for easy reading Tilt Stand Rubber Holster 2 SPECIFICATIONS 2 1 General Specifications Display 3 1 2 LCD 0 9 height maximum reading of 1999 Polarity Automatic sign for negative polarity Overrange Indication Highest digit of 1 1 is displayed Low Battery Indication lettering on the LCD readout Operating Temperature 09C to 50 less than 80 relative humidity up to 35 less than 70 relative humidity from 35 to 50 Storage Temperature 159C to 50 C Temperature Coefficient 0 C to 18 C and 28 C to 50 C less than 0 1 x applicable accuracy specification per degree C Po
30. it Color Multiplier Black o Black Resistance Tolerance Color Tolerance Silver 10 Gold 5 Brown 1 2 3 0 5 0 25 20 6 ESSET Brown 10 Red Rea 2 Orange 1 000 Yellow 10 000 100 000 6 8 Orange Green 9 4 5 Bands 12 Multiplier 1 2 3 Multiplier Vm NUT PART IDENTIFICATION CARDS To help identify the resistors and diodes used in the construction of your digital multimeter we have mounted the diodes and resistors of each section onto a card c The card will help you find the diodes and resistors quickly THE PARTS WILL NOT NECESSARILY BE LISTED IN THE ORDER SHOWN IN THE PARTS LIST SECTION OR IN THE ASSEMBLY PROCEDURE Q 9 SP When you are ready to assemble the meter kit follow the procedure shown For an example refer to page 11 for assembly of Section A The first resistor called for is R 2 470kQ resistor yellow violet yellow gold Locate it on the card x verify that it is the correct value Some resistors may be mounted backwards on EXAMPLE the card so you must be certain that you are reading the resistors correctly When the correct value has been established only then will you mount it into its correct position on the PC board l Q A Im lt gt RESISTOR READING EXERCISE Before starting assembly of your digital multimeter incorrectly or read th
31. itch 3 Plug the emitter base and collector leads of the transistor into the correct holes in either the NPN of the PNP transistor test socket whichever is appropriate for the transistor you are checking 4 Read the hre beta or DC current gain on the display 4 OPERATION MAINTENANCE 4 1 Battery and Fuse Replacement CAUTION BEFORE ATTEMPTING BATTERY REMOVAL OR REPLACEMENT DISCONNECT THE TEST LEADS FROM ANY ENERGIZED CIRCUITS TO AVOID SHOCK HAZARD 5 SAFETY SYMBOLS F Capacitance Measurement 1 Connect red test lead to the VOCAP input jack and the black one to COM 2 Turn the meter on by pressing the power switch 3 Set the rotary selector knob to the FARAD position 4 Set the rotary selector knob to the desired capacitance position 5 Short the leads of the capacitor to be tested together to insure that there is no charge on the capacitor 6 Connect the leads to the capacitor and read the capacitance value on the digital display The fuse rarely needs replacement and blow almost always as a result of operator error To replace the battery and fuse 200mA 250V remove the two screws in the bottom of the case Simply remove the old battery or fuse and replace with a new one Be sure to observe the polarity when replacing the battery CAUTION T E 500V max This marking adjacent to another marking or terminal operating device indicates that the operator must refer to an expl
32. llow see Figure A C1 1uF 104 Mylar Cap 1uF 104 Mylar Cap tee ies p small yellow RD 596 1 4W Res R1 220kQ 5 1 4W Res red red yellow gold see Figure A C2 1uF 104 Mylar Cap small yellow brown black green gold see Figure A ee TST Assombl d View Mount switch in direction shown Figure E Insert the switch into the PC board in the location shown Make sure that the notch on the switch is in the same direction as the marking on the PC board SW1 Switch On Off see Figure E Insert the 9V battery wires through the hole of gt the PC board as shown g BATT 9V Battery Snap RENT SOMME coger and cut off the Red Wire see Figure E Top Legend Side excess leads Black Wire 11 ASSEMBLE THE LCD Assemble the LCD into the housing with the parts shown in Figure F Note the top of the house is curved Wipe off zebra edges with a lint free cloth and then insert the zebra into the top slot of the housing The LCD must be put in with the notch in the direction shown in Figure F Peel off the clear protective film on top of the LCD see Figure F then place the LCD into the housing Place the display cover on top of the housing and press down to snap into place Place the LCD housing on top of the PC board as shown
33. nalog divide analog signal by 2 B C convert analog to digital D convert AC to DC What type of divider network is used for voltage measurements A Divide by 20 B Capacitance C Divide by 5 D Resistor When the AC voltage is measured it is first A divided down by 2 B converted to DC C coupled to a halfwave rectifier D low voltage When measuring current the shunt resistors convert the current to 0 190 to 0 190 B 1 199 to 41 199 C 0 099 to 0 099 D 199 to 0 199 Which IC drives the LCD 358 B LM324 C 7106 D 1N5232 A comparing voltage drops in the unknown resistor and a reference resistor B measuring the current in the unknown resistor C measuring the current in the reference resistor equalizing the voltage drop in the unknown and reference resistor 7 Measurement cycles performed by the A D converter can be divided into what types of time periods A Long short B Auto zero integrate read C Zero read interphase D Autozero read cycle phase 8 A resistor with band colors green black green brown green is what value A 50 5kQ 5 B 5 15 10 5 05 5
34. nd current circuit 1 Set range selector knob to an AC Volt scale position 2 Connect the test leads red lead to VOCAP and black to COM Turn the meter on by pressing the power switch 3 Measure an AC voltage with a known accurate meter Now measure the voltage with the kit meter The meters should be the same voltage Current Test 1 Turn the range selector knob to the 200 position 24 Place the battery cover onto the case as shown in Figure V Hold the two sections together with two x 17 5 screws Battery Cover Figure V 2 Connect the test leads red lead to and black to COM Connect the kit meter and another meter of known accuracy in series Set the meters the 200uA position Construct a circuit for an AC current and measure the circuit current Both meters should have close to the same readings If the meters do not agree check the parts just added Do not re adjust VR1 this will change the voltage reading set in step 1 Check the 2m 200mA scales The 20A scale requires a circuit of 1 20 amps If the tests are not working check for cold solder joints and part values TROUBLESHOOTING GUIDE If the meter is not working perform the U1 7106 Voltage Test first This test is to verify that the IC and Reference Voltage are operational Then U1 7106 Voltage Test 1 Measure the voltage across pin 8 and pin 34 on U1 7106 for 9V A Check the battery
35. nown reference voltage to the input of the A D converter The polarity of this voltage is automatically selected to be opposite that of unknown input voltage thus causing the INTEG capacitor to discharge 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 is proportional to the unknown input voltage The autozero period and thus a new measurement cycle begins at the end of the read period At the same time the counter is released for operation by transferring its contents previous measurement value to a series of latches This stored stat is then decoded and buffered before being used for driving the LCD display VOLTAGE MEASUREMENT Figure 3 shows a simplified diagram of the voltage measurement function The input divider resistors add up 10MQ with each step being a division of 10 The divider output should be within 0 199 to 0 199V or the overload indicator will function If the AC function is selected the divider output is AC coupled to a full wave rectifier and the DC output is calibrated to equal the rms level of the AC input Low Pass Filter AC to DC Converter Figure 3 Simplified Voltage Measurement Diagram CURRENT MEASUREMENT Figure 4 shows a simplified diagram of the current measurement positions Internal shunt resistors convert the current to between 0 199 to
36. ol Value Description Part 4 06 09 114001 Diode 314001 1 C3 LM324 Op Amp 330324 MISCELLANEOUS Qty Symbol Value Description Part 1 IC Socket 14 pin 664014 2 hre Socket 664015 19 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD hre Sockets Install these with no more than 0 4 of height from the PC board to the top of the Sockets Otherwise the top case will not fit together properly with the bottom IC Socket 14 pin LM324 Op Amp see Figure M R45 1500 1 1 4W Res brn green blk blk brn see Figure VR3 2000 Pot R47 11 1 1 4W Res brn brn blk red brn see Figure R46 76 8kO 1 1 4W Res violet blue gray red brn see Figure 1 D C14 01uF 103 Mylar Cap R48 160kQ 1 1 4W Res brn blue black orange brn see Figure C15 01uF 103 Mylar Cap D6 1N4001 Diode D7 1N4001 Diode see Figure O R29 100 1 1 4W Res orn blk blk gold brn see Figure R24 900 1 1 4W Res white black black org brown see Figure R25 90kO 196 1 4W Res white black black red brown see Figure R26 9 196 1 4W Res white black black brn brn see Figure R27 9000 1 1 4W Res white blk blk blk brown see Figure R28 900 1 1 4W Res white blk blk gold brown see Figure I niat Figure P I D Lay resistor flat against the PC R43 4 3kQ 196 1 4W Res 4 His board yellow or
37. ow terminals around the connection Then remove the solder and the iron and let the connection cool The solder should have flowed smoothly and not lump around the wire lead Solder bridges occur when solder runs between circuit paths and creates a short circuit This is usually caused by using too much solder To correct this simply drag your soldering iron across the solder bridge as shown 4 Here is what a good solder connection looks like IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF picofarads nF nanofarads or uF microfarads Most capacitors will have their actual value printed on them Some capacitors may have their value printed in the following manner The maximum operating voltage may also be printed on the capacitor T R fomen 1 2 3 4 5 Second Digit Multiplier Tm 103 Ss First Digit NLOOV 4 Tolerance Note The letter R may be used at times to Maximum Working Voltage signify a decimal point as in 3R3 3 3 The value is 10 x 1 000 10 000pF or 01uF 100V letter M indicates a tolerance of 20 The letter indicates a tolerance of 10 The letter J indicates a tolerance of 5 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors BAND 1 BAND 2 BAND 3 if used 1st Digit 2nd Digit 3rd Digit Digit Dig
38. p soldered on Bottom Figure A Figure B Figure C Figure D Lay resistor flat against the PC board Negative marking on capacitor TA White marking Negative on PC board marking on PCboard 522 D Marking E 7 on PC board Mount the capacitor with the negative Stand resistor on end as lead in the negative hole and the positive 4 shown Solder and cut off lead in the positive hole marked on the with the flat side in the the excess leads PC board Mount the capacitor flat same direction as the against the PC board as shown PC board marking R7 470 5 1 4W Res yellow violet yellow gold see Figure A T1 28C9013 Transistor see Figure C R5 100kQ 5 1 4W Res brown black yellow gold see Figure D R6 1MQ 5 1 4W Res brown black green gold see Figure A R9 470kQ 5 1 4W Res yellow violet yellow gold R8 470kO 5 1 4W Res yellow violet yellow gold see Figure A C6 22uF Lytic Capacitor see Figure B R4 100kQ 5 1 4W Res brown black yellow gold see Figure A C5 100pF 101 Discap R3 200 596 1 4W Res red black yellow gold see Figure A Bottom Legend Side C4 1uF 104 Mylar Cap small ye
39. rt test leads red lead to VO CAP and black to COM Turn the meter on by pressing the power switch 4 Capacitance Measure a cap with another meter and then connect the capacitor to the meter leads Adjust VR3 so that the meter reads the same as the accurate one This calibrates capacitance circuit of meter Using two or three different value capacitors check each scale If the test is not working check components R40 R48 VR3 C12 C15 D6 D9 and IC3 O H an ruse PA QUON a e 5 T um Assembled Views for Section Transistor Set the meter in the scales Place an NPN transistor into the socket Make sure that the transistor is in correctly Depending on the type of transistor the meter will range from 20 to 550 Place a PNP transistor into the PNP socket the range will also be 20 to 550 If the tests are not working check components R49 R50 and the transistor sockets 5 Turn the meter off and remove the battery top label and test leads DO NOT PROCEED TO SECTION F WITHOUT INSTRUCTOR S APPROVAL 21 SECTION F Final Assembly PARTS LIST SECTION F Qty Description Part 1 Button red 622027 3 Sleeve Input Socket yellow 622660 1 Sleeve Input Socket red 622661 1 Case 623112 1 Case Bottom 623203 1 Cover Battery 623210 2 Screw LCD Housing 2 5 x 8mm 642239 Note The shield may be install
40. splay by unscrewing the two mounting screws DO NOT PROCEED TO SECTION E WITHOUT INSTRUCTOR S APPROVAL SECTION E Capacitance and Transistor Testing Circuit PARTS LIST SECTION E RESISTORS Qty Symbol Description Color Code Part 1 R29 100 1 1 4W brown black black gold brown 121030 1 R28 902 1 1 4W white black black gold brown 129030 1 R45 1500 1 1 4W brown green black black brown 131530 1 R27 9000 1 1 4W white black black black brown 139030 O1 R42 1 91kQ 1 1 4W brown white brown brown brown 141930 1 R43 4 3kQ 1 1 4W yellow orange black brown brown 144330 1 R26 9kQ 1 1 4W white black black brown brown 149030 1 R44 10kQ 1 1 4W brown black black red brown 151030 1 R47 11kQ 1 1 4W brown brown black red brown 151130 2 R40 R41 39kQ 1 1 4W orange white black red brown 153930 1 R46 76 8kQ 1 1 4W violet blue gray red brown 157630 1 R25 90kQ 1 1 4W white black black red brown 159030 O1 R48 160kQ 1 1 4W brown blue black orange brown 161630 2 R49 R50 220kQ 5 1 4W red red yellow gold 162200 1 R24 900kQ 1 1 4W white black black orange brown 169030 1 VR3 2000 201 Trim Pot 191320 Note Resistor tolerance last band of 5 band resistors may be green instead of brown CAPACITORS Qty Symbol Value Description Part 4 C12 C15 01uF 103 Mylar large brown 241017L SEMICONDUCTORS Qty Symb
41. t Top Legend Side Fuse 0 2A 250V Mount holders with the tab side as shown on the bottom legend side solder into place Stand resistor on end as shown Solder and cut off the excess leads D1 1N4001 Diode D2 1N4001 Diode see Figure H R19 9000 5 1 4W Res white blk blk blk green see Figure R20 900 5 1 4W Res white blk blk gold green see Figure R21 90 5 1 4W Res white blk blk silver green see Figure R22 0 990 5 1 4W Res blk wht wht silver green see Figure R33 5 6kQ 5 1 4W Res cR aw See Page 21 for Assembled View and then insert fuse R32 3902 1 1 4W Res AE e orange wht blk blk brown e Tab GSC Bottom Legend Side 3 14 Insert the four input sockets into the PC board holes and then solder the sockets in place Apply enough heat to allow the solder to flow Attach the LCD to the PC board using the two 2 5 x 8mm screws Use the two top mounting hole and lightly tighten the screws The screws around the input sockets see Figure J will be removed to assembly the next section Figure K Input So
42. t leads to the device or circuit being measured 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 Turn off the power to the device or circuit being tested and discharge all of the capacitors prior to disconnecting the test leads B DC AC Current Measurement 1 Connect the red test lead to the A input jack for current measurement up to 200mA and the black one to Turn the meter on by pressing the power switch Set the range selector knob to the desired Amp current position If the magnitude of current is not known set the range selector knob to the highest range and reduce until a satisfactory reading is obtained Open the circuit to be measured and connect the test leads in series with the load in which current is to be measured Read the current value on the digital display Turn off all power to the circuit being tested and discharge all of the capacitor to disconnecting the test lead prior To measure in the 10A range use the 10A jack as the input jack Be sure to measure within 10 seconds to avoid high current hazard 31 C Resistance Measurement 1 6 Connect red test lead to the VOCAP input jack and the black one to COM Turn the meter on by pressing the power switch Set the range selector knob to desired Ohm position
43. wer 9V alkaline or carbon zinc battery NEDA 1604 Battery Life typical 100 hours with carbon zinc cells 200 hours with alkaline cells Dimensions w o holster 3 55 90 2mm W x 7 6 193mm L x 1 78 45 2mm H Weight w o holster Approximately 10 40z 300g Accessories Safety Test Leads 1 pair 2 2 Measurement Ranges Accuracy 1 year 18 C to 28 C DC Voltage Range Maximum Input 200mV 0 596 of rdg 2dgt 2 40 596 of rdg 2dgt 20V DC 1000V or peak AC 200V 0 5 of rdg 2dgt 1000V 0 8 of rdg 2dgt Normal Mode Rejection Ratio Greater than 46dB at 50Hz 60Hz 1k unbalance 28 AC Voltage Range Maximum Input 200mV 1 596 of rdg 2dgt 2 1 of rdg 2001 20V 1 of rdg 249 AC 750V maximum 50Hz 400Hz 200V 1 of rdg 2dgt 750V 1 5 of rdg 2dgt Resistance 2000 1 of rdg 2dgt 2kQ 0 8 of rdg 2dgt 20kQ 0 8 of rdg 2dgt Approximately Protected By 200kQ 0 8 of rdg 2dgt 1 2mA PTC 2MQ 0 8 of rdg 3dgt 20MQ 2 0 of rdg 4dgt Maximum open circuit voltage 2 8V DC Current Resolution Accuracy Protection 1 5 of rdg 2dgt Protected by 100A 250V 2A Fuse 1004A 42 5 of rdg 3dat Resolution Accuracy Protection 1uA Protected by 250V 2A Fuse 100A 10mA 0 of rdg do Resolution Accuracy Protection 100pF Test frequency 400Hz inF 100nF 5 of rdg 29 Transistor hre Range Test Condition NPN
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