User manual SEARS 82418

[. . . ] If the tester is connected across a high energy circuit when set to a 1ow resistance range, a is current _range, or any other low impedance range, the circuit virtually shorted. Disconnect the tester or turn off the power before changing switch positions. Do not connect to circuits with voltage present when switclr is in any ohms or current position. Whcn rcplacing fuses use only specificd type fuses and inscrt in correct fuse notd"j. , , _ is available. Conract a qualified person for assistance before attempting to make measurements on any high energy circuit. Special equipment designed for use with these circuits SAFETY rS No ACCIpENT -2- 2. PROTECTION-UL Fully Overload hotected - Ot*l. . d 1244, VDE O4I1 3. SPECIFICATIONS and protection is accomplishcd orr rrll t;trtllcs For overvoltage protection' a seclected sparkgap witlr low capacidance is-used which proved superior in pcrlirrtttrtrrcc'than the varistors used in other instrumcnts Art ilrrrrslr ( tlrrcnt limiter combination protects 500V DC or lttrs A(l trrt all resistance rages. Geneil oi"pt"y, ZUdigit LcD. [. . . ] Slide the POWER/FUNCTION switch to , , DC O, ' (mid hFE Test i"rt. orditior : hFE gain 0 - 1OuA 2. 8V 1000 (NPN. PNP) 3. Set RA, NGE switch to desired , , V', position. position). -7- untill satisfactory reading is obtained. -""r. r1"rn"rr, factor is not known, set switch to highest "ru range and reduce of Value not only for this functioniut If magnitude 4. Connect test leads 5. to device or circuit bcing measured. Turn on power to device or circuit bcing measured. Voltage value wili appear on Digital Display aiong with the voltage polarity. DC Current Measurement 1. . Red lead to "mA" jack for measurcrncr)ts rrp to Black lead to "COM" jack. For measuremenb between 2 Amps and red lead to "l0A" jack. the resistance being measured. is connected to a circuit, discharge all capacitors before applying test prods, 4. q Read resisrance value on Digital Display. 3. If turn off power and 2 Amps, Diode Tests L. POWER/FUNCTION switch to , . DC 0, ', , and 3, Ifthe l0 Amps, connect ) J. POWER/FUNCTION switch to "I)C ()", rnd RANGE switch to desired "A'' position. Open the circuit to be measured, and conncct test leads IN SERIES with the ioad in which currcnt is to be measured. , 4. semiconductorjunction being measured is connected to a circuit, turn off power and discharge all capacitors. In case of connection of forward (Red to anode, Black to, cathode) a good diode shows a value. If the diode under is defective, "000, ' (shorted), o, , , 1, , (opend) _test Read current value on Digital Display. AC Voltage Measurements When the test leads are connected reverse (Red to cathode, Black to anode), a good diode shows , , 1i'. Ifit is defective, "000" or other figures are to be displaved. L. POWER/FUNCTION switch to "AC", and RANGE switch to desired "V" position. Read voltage vaiue on Digital Display. Resistance Measurements Continuity Checks 1. 2. Red lead POWER/FUNCTION switch to "DC switch to desired "OHM" position. to "V. f, }", Black lead to "COM". 1. POWER/FUNCTION switch to , , DC A" , and RANGE switch to Btzzer ( , r|) ) position. Built-in buzzer sounds if the circuit under test is con_ tinuous. s2", and RANGE -9- ments th" -"t"t can be used for making temperature measureby connecting the tempelature probe (included) to , , v. o, , , and , , coM" jack. Do not exceed 150V continuously or 300V momentary (no more than l0 seconds) to avoid any dannge between the . . V. A" and "COM" jack or instrument. POWER/FUNCTION switch to "DC o" , and RANGE switch to "TEMP" position. [. . . ] METAL 20Ka a)2 c1, 2, 3 C4 C5 ZENERDIODEl2V]N963 R22 R23 c6, 7, t7, 12, 73 c8 c9 ('1 0 cl5, c16 c14 17 cr8, 19, 20 c21, 26, 27 c22 c25 c28 8C1, , 2 R1 R2 R3 R4 RESISTOR l OMA IIW ( . MI-TA I ZENER DIODI] 1, 2V 1N 94918 CAPACITOR it}pF ]6V ELECTROLYTI. ] CAPACITOR 1p F 16V IANTAI_ CAPACITOIi. 4. 7p F 1 6V E T. ECTROLYTIC CAPACITOR 0. 1rJ F 63V ME tAL|ZF, D CAPACITOR 0. 022!F 630V MrCA CAPACITOR O. 04'1 1tF 63v METAI, IZED CAITACIIOR 0. 22pF 63y MHT, ALIZED CAPACITOR 100pF 50V MtCA CAPACITOR 0. 01p F 50V CERAMIC CIAItrACITOR 30pF 50V CERAMIC CAPACITOR 0. 33pF 16V ELECTROLYTTC CAPACITOR 0. 022pF 5Ov CERAMTC CAPACITOR 0. 22pF 50y CERAMIC CAPACITOR. METAI, P, 24, 25 \2? R26, 28 R29 BR1 BR2 BR3. 6 VR1, 2 VR3 VR4 VR5, 6 VR7 BVR. 1 RNA RNB RNC RND RNE RNF RNG RS RESISTOR lMf} /rW I. [. . . ]