User manual SEARS C950-52475-5

[. . . ] Operating Environment: 0o to 50oC;less than S}Vorelat\ve humidity up to 35oC, less than 70% relative humidity from35oC. to 5OoC. than 0. 1 X applicable accuracy specification per Power: 9V alkaline or carbon-zinc battery (NEDA 1604) Battery Life: 100 hours typical with carbon-zinc cells 200 hours with alkaline cells. Al. o pair of fast switching high cttrrcrrt siltc()rr (li()des " plus a fuse provide excellent protection on rll ' ttttt ttt rrtrtgcs' Furthermore, the input of the analog to ililiitrrl I ()trvcrtcr is protccted against overvoltages. jacks are sheathed thus avoiding dangerous corl'rfcti()rrs to -eventual high voltages. lirtgcr stoppers to k""p fingers away from the barc cnd' 'Ilr(: l)r'od t"r-in"ls are sufficiently long and slendcr to rcach :tny tt:st points found in actual boards. Frotected Inpuf Socket and Test Lrads The 0. 16 in. input sockets are fully rcccsse'l 'ttrrl protected against accidental contacts The tcst lcarls srtpl>licd with the equipment give added safety to tltc usct sitrt. [. . . ] Voltage Drop 0. 25 0. 25 0. 25 0. 25 0. 75 0. 30 V V V V V AC Current Range Resolution Accuracy Max. F. S. Voltage Drop 100nA lp. A 10pA 100pA 1mA 10mA !(O. 5% rdg + 1 digit) !(0. 5% rdg + !(0. 5% rdg+ +(0. 75% rdg+ 1 digir) 1 digit) +(2%rdg+5digits) +(2%rdg+5digits) l disit) v Overload Protection mA Input: 2Al250Y 10A Input: Unfused up to 15A for fuc. 1 + (2%rdg+ 5 digits) Overload Protection mA Input: 24/250V fuse 10A Input: unfused up to 15A for 15 sec. Resistance 2mA 1pA 20mA 1OpA 200mA 10OpA 2000mA lmA 10A 10mA 200p"4 100nA !(0. 75Vo rdg + 5 digits) t Q% rae + 5 digits) x (0. 7 5% rdg + 5 digits) 0. 25V rms 0. 25V rms 0. 25V rms 0. 25V rms 0. 75V rms 0. 30V rms 5 sccortds. AC Voltage Range Resolution 100p. V Acctrracy Freq Range Range Resolution Accuracy Max, Open Circuit V 2. 8 500 500 500 500 2V 1mV 20V 1OmV !(0. 5% rdg + 5 digits) 200V 100mV on all ranges + (l% ds + 5 disits) 750V lV cxcept 200mV 200mV 45Hz - 500H2 on all ranges 2004 2KA 20KO 200Ka 2Ms} 20Mo 100mO ls} 10sl 1000 1KO 10KO digits) x(0. 3% rdg+ 1 digit) x (0. 3% rdg + 1 digit) !(2. 5% rdg + 5 digits) (0. 5% rdg + 3 ! 2, 8v v mV mV mV mV Convcrsion: Calibrated for rms of sine wave lnput Impedance: 10M shunted by 100pF on all ranges Max aliowable input: 500V dc or rms. trnt". _ U _ -6- Continui9Test Resoonse ('ttl ) 4. OPERATING INSTRUCTIONS General Resistance range: Btzzer sounds with rcsistances less than 200O approximately. time: Less than 100 m Sec. Diode Test ( -t<- ) Test voltage: 2. 8 Volts Maximum test current: 3m Ampcres, Temperature Measurement Range OoF Re solution 1oF Accuracy ro 2000oF Sensor; type K (NiCr-NiAI) ! + (50 + 2 aigitr; 3% , p to ZZSof sturment that is accurate, reliable and always ready for use. Equipped with nine functions and 36 ranges, each test position is quickly and easily selected with a simple rurn of the single selector switch. Smail enough to fit in attache cases and equippid -*'rth a multi-position tilt stand. This instruments is equally suited for design engineering, production. testing, field servicing, and industriJl mainienance apprlcatlons. The Sears Model C950-52475-5182418 is completely portable, high level 3-112 dig:^t multimeter designed for use by the engineer, technician, and hobbyist who demands an in- of rdg ovcr 2250F Conductance Measurement Range 200nS wffi;s T. The reading is in Fahrenheit Connect test leads to the measuring point and read the value on Digital DisPlaY' , l q I ral A' r' S; SIMENS = -oh; = international unit of con- B. The readout is in terms cif conductance with unit ductance formerly known as the mho. 2. r "F). nS (10-95). If resistance rcading is required, yo11 can divide I by the t""Jo"i, ft"ti-"rtdly by'i010' Use conductance measurement as a leakage tester. The S conductance mngp effectively extends the resistance measurement capability of this DMM to the point up to 10, 000M ohm where it can be used to provide useful leakage measurement on variable components, diodes, cables, connectors, printed- circuit 6oards (pcb's), etc. In all cases the test voltage is The meter is designed to show temperature automatically when a thermocouple is plugged into the jack' but the display will show "1" when no thermocouple is connected. <5V DC. I x 1010 = 0. 1 X 1010 = Resistance Readout (ohm) For ExamPle; If the measurement result is 10, the resistance reading @leadto"coM". 2. switch to "S Conductance Neasyrenebt POWER/FUNCTION switch ) to "DC O" , and RANGE is =1" o I I J x toto = 0. 1 X loro = l, oooM ohm 10" If the measurement result is 1000 1. , ^*^ rvvv 1. | x l0ro . ^ It is necessary to replace battery when the words "LO BAT" appears in the upper left corner of the LCD scteen. =l0Xl06ohm = l0M ohm =0. 001 x1010 3. Range 2. Capacitance Measurement it inward. For maximum life use Sears DieHard alkaline 9 volt battery, although any standard 9 volt Slide the battery cover upward by pressing 2. 2. measurement, all capacitance ranges should be set to zero, with an open condition without a condenser connected to CAP sockets, rurn the "CAP ZERO ADJ" so that zero reads on display. Connect capacitance test leads to condesser (For measurement of polarized qondensers, have the polarities of the CAP sockets, agree with those of a condenser). Read capacitance vaiue on Digital Display. POIIVER/FUNCTION switch to "DC S|" , and switch to desired "CAP" position. 4. battery is suitable. Piace the battery covet in right position. fry-R"PbIgggtIt 1. [. . . ] Adiust VR7 68"F+77oP=113oF 6, Set the reat cover to the instrument by tightening three screws. 4-1. 2000pF Slide POWER/FUNCTION switch to "DC O" , and RANGE switch to 2000 p position, Turn the "CAP ZERO ADJ", so that zero reading on display. Connect 100pF standard capacitor to CAP test leads, and tur:n the VR3 so that 1000 reading on display. icAtnloNl The calibration procedures should be perforrned in regular sequence. Always DC voltage must be adjusted pdor to AC voltage adjustment. _ 15_ - 16 - PART LIST SYMBOL U1 DESCRIPTION U2 U3 U4 U5 BU1 A/D CONVERTER ICL OP AMP SFC 2776 71 06 EX or GATE CD4070 or CD4030 R5 R6 R7 R8 DUAL TIMER NE556 OP AMP LM3O8A OP AMP TL061 NAND GATE CD4O1 Rll R9, 10 R1 2, 13 1 BU2 LCD cs1 D7, 2 D3- 10 BD1 Q 1, 2, 3, 5, 6 Q4 7Dl LCD DlSpLAy 3v2 DlctT (5 1 3031. 303R) CURRENT SOURCE LM334 TR, SI, NPN, 2N 3904 TR, SI, NPN, MPSA92 DIODE, SI, 1N 54OO DloDE, Sr, Sw lN 4148 DroDE, sr, sw 1N 4148 R14 R15 R16 R17 R18 R19 R20 R21 R ESTSTOR RESISTOR 4OOKA 74W F. CARBoN RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR 9OOO %W C. [. . . ]