Keithley 7158, Instruction Manual

Page 1: ...t Service Center Repairs Experienced Engineers and Technicians on staff in our State of the art Full Service In House Service Center Facility InstraView Remote Inspection Remotely inspect equipment be...

Page 2: ...Model 7158 low Current Scanner Card Instruction Manual Contains Operating and Servicing Information Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 3: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 4: ...0 1987 Keithley Instruments Inc Test Instrumentation Group All rights reserved Cleveland Ohio U S A June 1990 Second Printing Document Number 7158 901 01 Rev B Artisan Scientific Quality Instrumentati...

Page 5: ...ossible wear cracks or breaks before each we For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS re move power from...

Page 6: ...rlock If a screw is present on the test fixture connect it to safety earth ground using 18 AWG or larger wire The f symbol on an instrument or accessory indicates that 1OOOVor more may be present on t...

Page 7: ...aximum signal level CONTACT RESISTANCE Xl to rated life CONTACT POTBNTIALr 20 V ACTUATION TIME Ims exclusive of mainframe OPPSET CURReNT 10 A 3 x 10 laA typical COMMON MODR VOLTAGE 3OV peak GENRRAL EN...

Page 8: ...and Removal 8 2 5 Operation 10 2 5 1 Scanner Control of the Channels 11 2 52 Operation Notes 18 2 6 Applications 18 SECTION 3 SERVICING INFORMATION 3 I 3 2 3 3 3 4 3 5 3 6 Introduction 25 Handling an...

Page 9: ...Mode 15 2 5 Scanner Control of Model 7l58 2 Pole Mode 15 2 6 Scanner Control of Model 7l58 l Pole Mode 16 2 7 Scanner Control of Model 7158 Matrix O Pole Mode 17 SECTION 3 SERVICING INFORMATION 3 l R...

Page 10: ...hematic 20 2 6 Capacitor Leakage Instrument Setu x 21 2 7 Measuring Leakages with One Car 23 SECTION 3 SERVICING INFORMATION 3 l Offset Current 28 3 2 Coax Pigtail Preparation 30 3 3 Contact Resistanc...

Page 11: ...Low offset current error IpA specified 30fA typical l Switching of AC or DC signals up to lOOmA l BNC input and output connectors l Two outputs for daisy chaining of Model 7158 cards l Configurable f...

Page 12: ...dangers that could result in personal injury or death The CAUTION used in this manual explains hazards that could damage the card 1 5 UNPACKING AND INSPECTION The Model 7158was inspected both electri...

Page 13: ...y Model 4804 Triax F to BNC M Adapter 1 6 SPECIFICATIONS Detailed specifications of the Model 7158 precede the Table of Contents of this manual 314 Artisan Scientific Quality Instrumentation Guarantee...

Page 14: ...nce 2 Make sure the scanner mainframes are grounded through an earth grounded receptacle before operation 3 Inspect all connections for wear and defects such as cracks and ex posed wires 2 2 1 High Im...

Page 15: ...and the outputs are indicated on the relay covers The two output connectors permit multi ple Model 7158cards to be connected together For example a 20 channel scanner system can be connected as shown...

Page 16: ...nge Since cable flexing due to vibration and cable expansion and contraction due to temperature fluctuation cause friction the signal cables should be fastened to a rigid surface and not subject to te...

Page 17: ...avoid possible static damage Once the card is cabled insert it card edge first into the scanner main frame by aligning it with the grooves in the appropriate slot Make sure it is proper1 seated into t...

Page 18: ...I J Figure 2 2 Installing Card in Model 705 9 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 19: ...een signal IQ analog ground and output HI Signal LO outside shell of the BNC is com mon to all channels and outputs in the system An additional relay isolates all circuitry on the card from the output...

Page 20: ...7158can also be configured for voltage switching schematic shown in Figure 2 48 This configuration is made possible by remov ing the socketed driver chips Ul and U2 for the channel HI to LO relay coil...

Page 21: ...odel 7158 Card 2 Model 7059 10 channels 10 channels Scanner 7158 Scanner 7059 Ch No Ch No Ch No Ch No 001 1 011 1 002 2 012 2 003 3 073 3 004 ii 014 4 005 015 5 006 6 016 6 007 7 017 7 008 8 018 8 009...

Page 22: ...19 020 3 5 5 6 6 7 7 i 10 10 I Card 2 20 de1 7064 Scanner Ch No 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 lnels 7064 Ch No 1 2 3 4 i 9 10 11 12 13 14 15 16 17 i 2...

Page 23: ...12 13 14 15 16 17 18 19 20 kd 3 h Colum 706 Zrosspoinl 011 1 011 2 011 3 011 4 012 l 012 2 ol2 3 ol2 4 013 1 ol3 2 013 3 013 4 014 l 014 2 014 3 014 4 015 1 015 2 015 3 015 4 Id 7052 4 rows ___ 7052...

Page 24: ...0 41 50 41 50 Scanner I 7158 Channel No l 10 l 10 l 10 l 10 l 10 l 10 l 10 l 10 l 10 l 10 Scanner 705 706 705 706 706 706 706 706 706 706 706 706 Table 2 5 Scanner Control of Model 7158 2 Pole Mode Ca...

Page 25: ...46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 706 Card 8 Scanner Ch No 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 706 Card 4 Scanner Ch No 61 62 63 64 65 66 6 68 6...

Page 26: ...No 31 1 32 1 33 1 34 1 35 1 31 2 32 2 33 2 34 2 35 2 706 Card 8 kanner Ch No 36 1 37 1 38 1 39 1 40 1 36 2 37 2 38 2 39 2 40 706 Card 9 Scanner Ch No 41 1 42 1 43 1 44 1 45 1 41 2 42 2 43 2 44 2 45 2...

Page 27: ...mum number of simultaneous channel closures unless relays from other card types are energized at the same time 4 System response is affected by cable capacitance This should be con sidered when the so...

Page 28: ...connectors Remove the stress from the insulators and use material with low piezoelectric effects to minimize l Electrochemical effects generate current between PCB conductors due to contamination of...

Page 29: ...capacitor is recommended for capacitor values above l to maintain stability and noise performance The instrument setup is shown in Figure 2 6 For clarity only four chan nels are shown Obviously all te...

Page 30: ...a Model 617 electrometer stagger charges the capacitors when the corresponding channels are closed on a Model 7056 general purpose card At this time the signal HI to Lo relay on 21 Artisan Scientific...

Page 31: ...round Then the Model 7056 channel is opened to avoid a current surge through the electrometer and resistors Rl and R2 bleed off the capacitor charge With this two card configuration the capacitors hav...

Page 32: ...XTURE SHlELDED TEST FIXTURE Figure 2 7 Maasurlng Leakages wlth One Card Figure 2 7 Maasurlng Leakages wlth One Card 23 24 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisa...

Page 33: ...the edges to avoid contaminating it with dirt body oil etc CMOS and other high impedance devices are subject to possible static discharge damage because of the high impedance levels involved When hand...

Page 34: ...the solvent has been applied and is still liquid blow dry the board with dry pumped nitrogen gas 3 3 RELAY REPLACEMENT If you have determined that a relay is defective use the following pro cedure to...

Page 35: ...Description ___ Scanner Mainframe Extender Card Low Noise Coax Cable Electrometer l riax to BNC Adapter Ohmmeter DMM Kelvin Test Leads Specification 4 feet long 10 A sensitivity la sensitivity 3 5 OF...

Page 36: ...677 and release its zero check Note the off set current long enough to allow the switching transients to decay and the current to stabdize The current indicated by the electrometer should be less than...

Page 37: ...braided shield and twist it off to the side l Strip one inch of insulation off the center conductor 3 Connect the Model 7158 to the scanner through the Model 7061 Universal Adapter Card which is used...

Page 38: ...tails as shown in Figure 3 38 9 Program the scanner to close the channel being tested This closes both the signal HI to output HI relay and the isolation relay for measuring IO Verify that the contact...

Page 39: ...r and moving the other BNC plug and Kelvin leads to the remaining input connectors Take readings with the ap propriate channel closed Flgure 3 3A Contact Resistance Slgnal HI to LO Relays 31 Artisan S...

Page 40: ...Figure 3 38 Contact Resistance Signal HI to Output HI Relays 32 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 41: ...rts 4 3 ORDERING INFORMATION To place a parts order or to obtain information about replacement parts contact your Keithley representative or the factory See the back cover for addresses When ordering...

Page 42: ...Resistor 10kfI 5 hW Carbon Composition Resistor Network lOkB 2 1 5W Thick Film Terminal Teflon sev TE 105 1 IC Buffer Line Driver and Receiver sev IC 520 74HC241 IC Hex Inverter 74HC04 sev IC 354 IC M...

Page 43: ...FACTORY SERVICE If the scanner card is to be returned to Keithley Instruments for repair perform the following 1 Photocopy and complete the service form at the back of this manual and include it with...

Page 44: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 45: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 46: ...Service Form Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Page 47: ...thley Instruments Inc Test Instrumentation Group 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific...

Page 48: ...t Service Center Repairs Experienced Engineers and Technicians on staff in our State of the art Full Service In House Service Center Facility InstraView Remote Inspection Remotely inspect equipment be...