Keithley 1765 Service Manual Download Page 31 | Manualshive

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Summary of Contents for 1765

Page 1: ...hlnc 28773 Aurora Road Cleveland Ohio 44139 216 248X400 Fax 216 498 2704 BZiii Service Manual Model 1765 Contains Servicing Calibration Information for Models 136and 176 Kaithley Instruments Inc 28775...

Page 2: ...ntries maintain service and calibration facilities To insure prompt repair or recalibration service please contact your local field representative or Keithley headquarters directly before returning th...

Page 3: ...ORlES ESSORIES ESSORIES MUTUAL ACCESS MODEL 135 EXCLUSIVE ACC MODEL 176 EXCLUSIVE ACC rc r I I NLc CnlrlLAI I N GENERAL MODEL 135 PERFORMANCE VERIFICATION MODEL 176 PERFORMANCE VERIFICATION lrlC T vr...

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Page 5: ...hese two DMM s to prov de iong term accuracy and m mtze main tenance Calibration IS required only once a year If aikal e battertes are used SIX C cells I the 176 or one 9 volt ceil for the 1351 batter...

Page 6: ...C SuppIled Accessmes 176 Mod l 1768 Battery Pack with batteries Modei 1691 Test Lead Set 135 9V batterv Model 1691 Test Lead Setl D Installed or separate opf onal accesso es as orderea 1 14 SPECIFICAT...

Page 7: ...MODELS 1351176 135 SPECS GENERAL INFORMATION l 3...

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Page 9: ...1s a 0 001 ohm l 4 terminal shunt A fifty ampere current WI correspond to 50 m ll volts To Operate Connect separate current leads not fur mshed between the source and the Model 165 1 hex head bolts Us...

Page 10: ...Probe 2 S Model 1686 Clamo On AC Current Probe The Model 1665 meawres AC current by clampIng onto The Model 1665 mea AC current by clampfng onto a s ngle conductor Interrilptmn ot the current path IS...

Page 11: ...I v 13 I Y 14 I 100mm x 300mm x 350mml Ii has a fltfed foam lnserf wth room for 1he DMM struct o book and small accessories FIGURE 2 10 HARD CASE 2 18 Model 1766 Battery Eliminator The Model 766 Batre...

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Page 13: ...ess than 80 R H 3 4 Recommended Test Equipment Recommended test equipment for performance verlfl cat on of both instruments IS hsted in Table 3 1 Alternate test equipment may be used However 11the acc...

Page 14: ...em 8 Table 3 l to the 135 V Rand COM termlnais Refer fo Figure 3 2 C Follow Table 3 3 and DDIY the reaulred AC Voltaae for each range Venfy th ai he reading IS wlfhtn speci ftca11ons Wed I Table 3 3 T...

Page 15: ...135 s 10A Hi and 10A LO terminals Refer to Figure 3 6 E Apply lO OOA to the 135 and ver fy tha rhe reading IS w h 3 88 to 10 12 3 11 AC Amps Verification A Select the AC Amps functlon and the 20mA ra...

Page 16: ...y the required AC Voltage for each range Verlfythafeach reading iswithIn spec lflcatlons listed n Table 3 6 TABLE 3 6 AC VOLTAGE PERFORMANCE CHECK Range Applied Voltage Allowable Reading at 18 C to 28...

Page 17: ...the iC Amps funwon Connect the AC Callbraror jlrem 6 Table 3 1 to the puiotIheCurrentCaiibrator ltemE Tab e3 ti Con nect the Outpu of the Current Callbraior IO the 1 76 Hi and LO termnals Refer to F g...

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Page 19: ...o facilnate understandtng each descrtptton IS accom panted wth slmpilfied schematIcs blockdlagrams tables V Q ATTENUATOR RESISTANCE 4 2 MODEL 136 OVERALL FUNCTIONAL DESCRIPTION The Mode 135 1s a 4 1 i...

Page 20: ...o BSIS IIS 15the same Taking the ratlo of rhe voltage drop across Rx 10 the drop across R e e en ecoriectly caiculates ohms The value of the voltage reference IS irrelevant as t only serves to apply a...

Page 21: ...IS destgned to m n mize ntetnal heatlng I the event of overloads Figure 4 4 is a simple block diagram showing AC DC current measurements CAUTION Do not exceed maxtmu allowable input Instrument damage...

Page 22: ...TE 20K COUNTS AT FULL SCALE NEGATIVE INPUTS TO A D FIGURE 4 7 NEGATIVE REFERENCE INTEGRATE POSITIVE REFERENCE INTEGRATE ZOKCOUNTSAT FULL SCALE INPUTS TO A D FIGURE 4 8 POSITIVE REFERENCE INTEGRATE Als...

Page 23: ...on U104 which is the precision recttfler amplifier iUlO4 of the AC co erter 4 9 MODEL 176 OVERALL FUNCTIONAL DESCRIPTION The Model I 76 IS a 4 I 2 diglf f20 000 count portable bench DMM It has 4 DC ag...

Page 24: ...igure 4 l 1 _ 107 R116 _ _ E d TO AC CONVERTER J _ lOOKa PROTECTION OPEN C103 C104 Cl05 DEPENDING ON RANGE R109 ilooo lKS2 FIGURE 4 11 AC VOLTS DIVIDER The AC converter IS a preclson half wave reci f...

Page 25: ...ran4e5 ihedls lavedreadlnaistheac1ualres si lOKI2 PROTECTION PROTECTION T INPUT h 4iOKn PROTECTION REF LO II PROTECTION h INPVT HI UNKNOWN RX RESISTOR 6 INPUT LO Input HI Input LO Ret HI Ref Lo FIGUR...

Page 26: ...msec duralton The input of the A D converter IS f rst buffered by Ul 10 and then II IS integrate0 by Ul 11 When posmve s g als are applied to the A D the nfegrator generares a nega we gang ramp This...

Page 27: ...puts Therefore Vdtsplay Ref yil u Lo x 10 000 The full scale nputs for the A D are as follows 1 ACV 2V full scale mput 2 DCV ezv IfUll Scale inDuti 3 n t2v full Scale l Ii 4 ACA 2V lfuli scalB InPut 5...

Page 28: ...c rcu try and one lor the diglial ctrcutrry The 5 volt suppiy IS used for rhe comparator the analog swtches and mosr of the OP amps The facr that CR1 I 1 IS stable wfh r me and temperarure enables it...

Page 29: ...of 23 C _ I C and a reiat ve humld ty 01 iess than 70 If the instrument has been sublected to temperaiures outside of this range or to h gher hurmd aI ow one hour mln mum for Ihe tnsrrument to stabtl...

Page 30: ...rated clrcults should be handled and transported only in protection contamers Typically they will be received I anti static tubes or elecrr callv conductive foam Keep the devices in thefr origlnaf con...

Page 31: ...age Take care to prevent contact with live circuits which could cause electrical shock resulting in injury or death TABLE 5 l POWER SUPPLY CHECKS step Item Component Rewired Condition I Remarks t J101...

Page 32: ...o Zero 9 U21 3 pm2 Voltage O O Volts fl OOm Volts Integrator Sum 10 U213 pin mtng Junction 1VOll to 3 volts 11 U213 p n 5 integrator Outpvt 0 volts 12 U213 pin 7 Buffer Input 0 Volts 40m Volts Buffer...

Page 33: ...V and DCV use the same attenuator ver f cat on Of the DC arte ua or IS sufflclent to unsure that the AC atten aIOr IS functlonlng properly TABLE 5 5 AC ATTENUATION CHECKS step Item Component Required...

Page 34: ...nnect ammeter from ln ur HI to LO TABLE 5 7 RENT SHUNTS CHECKS Contlnuilv Correct shunt value for specified range Turn on power and select DCA 20mA range 0 to 1 Volt _ _ ____ _ If incorrect check QlOl...

Page 35: ...m allowable tnput volrage Instrument damage ma occ r Maximum allowable inputs are stated I the specifications A Turn off rhe power I ihe Model i 766 s ns a ied d sco nect he hne oral 8 Turn Ihe instru...

Page 36: ...5 1 1A B C and D A Power Supply Start off troubleshootmg wlfh the power supply In Table 5 8 there are several steps and checks that WIII ver fy If the power supply s provtdmg the approprzate voltage...

Page 37: ...otn 15 Ul 11 bin 3 2 5Hz 0 to 5V squarewave 14 70mV 15 VI 11 p n 7 230rn 16 Ul 11 p n I Nommal 1 2V 17 External Voltage Apply 1 OV to Hi and LO Source 343Al l P 18 Ul 11 p1n 7 Ftgure 5 6 19 111 PI I F...

Page 38: ...C range 2 External AC Source Apply Vrms at 1 KHz Cailbrated input 745A 3 U108 lx 7 1 OVrms Umty Gain Buffer 4 Rl 17 PI 9 1 OVDC Output of AC con verter R 1 19 IS ad justed to gwe 1 0 VDC qufp t for 1...

Page 39: ...k Check for 0 I OS Short RTlO CO l 1 check 5 16 Battery and or Fuse Replacement To replace the batteries the top cover musl be removed To do this follow the pmcedure outI ned I paragraph 5 1 1 A 6 C a...

Page 40: ...EPLACEMENT E 18 MODEL 1766 TROUBLESHOOTING The Model 1766 Battery Ellmtnator troubleshooting 1s relar velv simple when followng the steps outlined in Table 5 l 4 MODELS 135 l 6 The Turns ram between t...

Page 41: ...MODELS 1351176 MAINTENANCE FIGURE 5 14 SWITCH 5103 IN THE ACV POSITION FIGURE 5 15 SWITCH S103 IN THE DCV POSITION...

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Page 43: ...ely The Model 1766 schema is located on Page 6 14 TABLE 6 l CROSS REFERENCE OF MANUFACTURERS MFR Code A 8 ACI ERN CAD CLB CNW DLE EC1 EDI EFJ ERI GEE i i E f f h c E 5 E E b E Name and Address Alien B...

Page 44: ...BH 29 PA 130 RT 7 UlOl u102 u210 u211 u212 u201 u202 CRllO Rl17 0104 CR103 CR108 CR109 CRlOl CR102 CR104 CR107 FlOl J1019 RTlOl C0llnter CMOS OP Amp Analog Swnch Selected IC 283 Excius ve OR gates Re...

Page 45: ...6 22 A5 ECI 625BlA105 C 215 Cl21 100 1OOOV Cer D 2 23 C5 CLB DO 101 c 64 loop Cl22 lpF 1OOV Mtl Poly 24 C5 PLY 160 O 1MFD c 305 1 Cl23 047 1F 1OOV Mtl Poly B5 25 C5 PLY 160 047MFD c 305 047 Cl24 lO iF...

Page 46: ...lstor 8mA 500V TC A3 L F 312002 FU 13 A3 PNC 034 1519 FU 48 Hl 52 E6 SHG H 28 C6 6 A5 59 A4 60 B4 61 A4 62 C4 NAT MOT NAT G E YOS 1893 6ASE 12 2N3904 2N3906 2N3904 GES 58 18 TG 47 TG 84 TG 47 TG 138 H...

Page 47: ...F2 D E3 Fl c4 119 D2 120 D3 121 D4 122 A4 123 A5 124 85 125185 126 C5 127 C5 128 D5 129 D5 13 R5 INT T l NAT MOT T I TL062CP M308 LMl 1CLN TL062CP u119 1 CMOS Two Input AijD 1 SEV I 131 65 I RCA I I g...

Page 48: ...t5 c5 D5 c5 44 E6 SEV Dl D2 c5 SEV 45 34 35 35 46 f J EV i4 jEV iz jEV EV jEV 13 4 15 4 15 r5 l PC Board Item No LOCatiOn 7 D2 8 E2 9 E2 lo E2 ll FZ 1 Z F2 13 F2 14 F3 ltl EZ 19 E2 33 E3 34 E3 35 E3 3...

Page 49: ...G2 G2 G2 Gl Fl Fl 63 El A5 62 62 G2 G2 H2 Dl Cl El El A3 A3 Fl A3 83 SEV Fl Fl F2 SEV 3182 4 B2 5 B2 6 B2 7 B2 E 82 g c2 lO B3 11183 i 2 A3 13 A3 14 B4 15 B3 16 C3 17 B4 18185 19 B4 2O B4 21184 22 86...

Page 50: ...4 06 IRC GB W R116 Thick Film SEV 75 C2 CAD TF 126 R117 1 1 BW MtF F 76 C Part of a set selected at the factory 30985A The set includes CR1 10 and RI 17 fl 76 3 3 R 179 21 93K Rl 79 S SBK RP 1 1 l 200...

Page 51: ...MODELS 1351176 REPLACEABLE PARTS...

Page 52: ...REPLACEABLE PARTS MODELS 1351176...

Page 53: ...MODELS 1351176 REPLACEABLE PARTS...

Page 54: ...REPLACEABLE PARTS MODELS 135 176 6 12...

Page 55: ...MODELS 1351176 REPLACEABLE PARTS...

Page 56: ...REPLACEABLE PARTS MODELS 135 176 P t t 7 I 6 14...

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