Keithley 7014 Manual Download Page 9

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Summary of Contents for 7014

Page 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Page 2: ...Instruction Manual Model 7014 3 Channel Thermocouple General Purpose Multiplexer Card Contains Operating and Servicing information...

Page 3: ...st 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty...

Page 5: ...visions contain important change information that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with t...

Page 6: ...esent A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Users of this product must bc protected from electric shock at all times The rcspons...

Page 7: ...y before performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the warranty Instrumentation and accessarics sh...

Page 8: ...Model 7014 39 Channel Thermocouple General Purpose Multiplexer 10 7 C PC to 18 C and 2FC to M C REFERENCE o wu Pc SP mn at 0 C Bankss...

Page 9: ...contents 1 2 Instruction manual l 3 Repacking for shipment l 3 Optional accessories l 3 Multiplexing Basics Introduction 2 l Thermocouple measurements 2 l Definitions 2 l Theory 2 l Measurement proce...

Page 10: ...4 Multiplexer switching examples 4 5 Thermocouple scanning 4 5 Resistor testing 4 5 Transistor testing 4 10 Resistor temperature coefficient testing 4 10 Measurement considerations 4 13 Thermocouple m...

Page 11: ...es of operation 5 19 Block diagram 5 19 ID data cncults 5 20 Relay control 5 21 Reference junction 5 21 Power on safeguard 5 21 Troubleshooting 5 21 Troubleshooting equipment 5 21 Troubleshooting acce...

Page 12: ...card 1 x 19 and 1 x 20 system example 3 8 Figure 3 11 Two card system example 3 10 Figure 3 12 Two mainframe system example 3 11 Figure 3 13 Model 7014 card installation in Model 7001 3 13 Multiplexi...

Page 13: ...nd loops 4 16 Figure 4 14 Eliminating ground loops 4 16 5 Service Information Figure 5 l Figure 5 2 Figure 5 3 Figure 5 4 Figure 5 5 Figure 5 6 Figure 5 7 Figure 5 8 Figure 5 9 Figure S 10 Figure 5 11...

Page 14: ...tion ___ 4 8 5 Service Information Table 5 1 Verification and calibration equipment 5 3 Table 5 2 Bank isolation test summary 5 10 Table 5 3 Channel to channel isolation test summary 5 12 Table 5 4 Di...

Page 15: ...ture C F or K using appropri ate thermocouple tables polynomial equations or a multimeter capable of temperature measurements such as the Model 2001 In addition any channel can be used for monitoring...

Page 16: ...Addenda are provided in a page replacement format Simply replace the obsolete pages with the new pages 1 5 Safety symbols and terms The following symbols and terms may be found on an instrument or us...

Page 17: ...Repacking for shipment Should it become necessary to return the Model 7014 for repair carefully pack the unit in its original packing carton or the equivalent and include the following in formation A...

Page 18: ...1 4...

Page 19: ...rds Cold junction The junction that is held at n stable known temperature Also known as the reference junc tion Hot junction The junction of two dissimilar metals that is used to measure an unknown te...

Page 20: ...mperature TI with the formula T El 54 63mV 0 2mV per C T represents the temperature of the Model 7014 isothermal connections Using the thermocouple look up tables or the fol lowing formula convert the...

Page 21: ...will perform the measurement procedure automatically except for closing and opening channels on cx ternal cards 2 3 Basic multiplexer configurations A simplified schematic of the Model 7014 Thermocou...

Page 22: ...xers no jumpers installed Fig ure 2 3 l Two 1 x 20 multiplexers Bank A jumpered to Bank B Bank C jumpered to Bank D Figure Z 4 l One 1 x 40 multiplexer all bank to bank jumpers installed Figure 2 5 Ot...

Page 23: ...ion Bank A 1 y O tp tA 10 1 j2 Bank B 10 2 l 1 z2 Bank C output c 10 2 l Bank D Figure 2 4 Two 1 x 20 multiplexer configuration jumpers installed I j2 Bank B Jumpers 10 z 1 f2 Bank C Jumpers IO z2 1 2...

Page 24: ...ond 701X series card installed in the mainframe With the jumpers removed cut the multiplexer card is iso lated from another card installed in the mainframe The three pole analog backplane of the Model...

Page 25: ...in the other slot The only way to connect a Model 7014 to one of these cards is to wire them to gether 2 4 Typical multiplexer switching schemes The following paragraphs describe some basic switch in...

Page 26: ...al or floating switching configuration is shown in Figure Z 10 The advantage of using this con figuration is that the terminals of the SOUIC or measure instiument are not confined to the same pathway...

Page 27: ...al cabling Whenever path resis tance is a consideration sensing should be used Figure 2 12 shows how to connect a Keithley Model 236 237 or 238 Source Measure Unit to the multiplexer card By using tri...

Page 28: ...em using as many as 12 cards can be configured 2 5 1 Two card switching systems Each Model 7001 Switch System mainframe can ac commodate two cards to allow the following switching configurations NOTE...

Page 29: ...uld be a single 1 x 80 mul tiplexer Mixing card types Different types of cards can be used together to create some unique switching systems For example you could have a Model 7014 multiplexer card ins...

Page 30: ...2 r _____ r Quad 1x10 Multiplexers I _____ Quad 1xl 0 Multiplexers Quad 1x20 Multiplexer Figure 2 14 Mu t her input expansion example L 2 I 1 I I I II I IBank L 4 x 10 Matrix Quad 1 x 10 MUX Figure 2...

Page 31: ...mainframe 3 2 Handling precautions To maintain high impedance isolation care should be taken when handling the relay card to avoid contami nation from such foreign materials as body oils Such contamin...

Page 32: ...could result in person ai injury or death 3 3 1 Bank to bank jumpers As explained in paragraph 2 3 1 the banks of the mul tiplexer card can be connected together using plug in jumpers to form larger m...

Page 33: ...ct Bank A HI to Bank B HI Connect Bank A LO to Bank B LO Connect Bank B HI to Bank C HI Connect Bank B LO to Bank C LO Connect Bank C HI to Bank D HI Connect Bank C LO to Bank D LO Referring to Figure...

Page 34: ...be removed It is not necessary to physically remove the jump ers from the PC board Using a pair of wire cutters cut one lead of each jumper Jumper installation Referring to Figure 3 5 for jumper locat...

Page 35: ...y handle the cards by the edges and shields to avoid contamina tion 2 Using an insulated screwdriver connect the cir cuitry to the appropriate terminals Figure 3 7 shows how the output of Bank C would...

Page 36: ...configurations Keep in mind that these are only examples to demonstrate various ways to wire a test system Connection details are provided in paragraph 3 3 3 4 1 Single card system The single card sy...

Page 37: ...rd Connections Installation DUT Test Fixture Notes 1 All bank to bank jumpers must be installed 2 There are no user connections for the reference junction BankA Input 1 Simplified Equivalent Circuit 3...

Page 38: ...mplified Equivalent Circuit Notes 1 Bank to bank jumpers installed as iollows Bank A connected to Bank B Bank C connected to Bank D 2 There are no user connections for the reference junction Bank A In...

Page 39: ...a system using three multiplexer cards installed in two Model 7001 mainframes to con figure a single 1 x 120 multiplexer system Each card is configured as a single 1 x 40 multiplexer To accomplish th...

Page 40: ...40 42 DUT Test Fixture Simplified Equivalent Circuit Figure 3 11 Two card system example 3 10...

Page 41: ...Card Connections Installation 82 4 Simplified Equivalent Circuit Figure 3 72 Two mainframe system exampk 3 l 1...

Page 42: ...rgy in ex ternal circuitry is discharged 1 Mate the connector card to the relay card if they are separated Install the supplied 4 40 screw at the end of the card to secure the assembly see Figure 3 4...

Page 43: ...t Ejector Arms 2 WARNING Tighten the thumb screw to ensure proper chassis ground Figure 3 73 7074 card installation in Model 7007 3 13...

Page 44: ...3 14...

Page 45: ...he channel status display exceed the following maximum signal levels for each slot is shown in Figure 4 2 The card contains Operation DC signals AC signals 1lOV between any two pins termi nals 1A swit...

Page 46: ...rovided in Figure 4 3 Each CHANNEL assignment is made up of the slot designator 1 or 2 and the multiplexer channel To be consistent with Model 7001 operation the slot designa CHANNEL 1 2 Slot 1 Channe...

Page 47: ...all the channels specified in the channel list Pressing OPEN or OPEN ALL will open the channels SELECT CHANNELS 2 36 Scanning channels The above closed channel can be opened by pressing OPEN or OPEN...

Page 48: ...s four commands These commands are listed as follows RST TRIGger SEQuence COUNt AUTo ON ROIJTe SCAN list INIT The first command resets the mainframe to a default scan configuration The second command...

Page 49: ...couple read ings with the thermocouple type reference junction channel temperature coefficient and voltage offset These parameters are entered from its front panel or programmed from the IEEE 488 bus...

Page 50: ...Operation Figure4 4 Thermocouple scanning 4 6...

Page 51: ...two poles of switching are re quired for each resistor tested For this reason only 19 resistors per card can be tested using this configura tion NOTE Since Channel 1 of the Model 7014 is the referenc...

Page 52: ...18 and 38 19 and 39 20 and 40 Bank C In 8 Bank A In 9 and Bank C In 9 Bank A In 10 and Bank C In 10 Bank B In 1 and Bank D In 1 Bank B In 2 and BankD InZ Bank B In 3 and Bank D In 3 Bank B In 4 and Ba...

Page 53: ...ated as follows Note that simply reversing the current source polarity will result in a 2x accuracy specification change To avoid this problem matrix switching could be added E E to the test system to...

Page 54: ...then be calculated as out lined above TC AR lob RI AT where TC temperature coefficient in ppm C AR change in resistance reference resistance test resistance R actual resistance at the reference temper...

Page 55: ...A Test Configuration 8 Simplified Equivalent Circuit Figure 4 8 Configuration for current gain and common emitter test 4 11...

Page 56: ...r t T r Figure 4 9 Resistor temperature coefficient testing 4 12...

Page 57: ...re and its associated circuitry are shown in Figure 3 6 Reference junction sensor The primary factor determining reference junction ac curacy is the operating temperature By using the Mod el 7014 in t...

Page 58: ...ameters combined into one temperature specification For type K thermocou ples the Model 2001 has 0 5 C accuracy Air drafts For optimum performance the card should be protected from drafts Air currents...

Page 59: ...t length even weak magnetic fields like those of the earth can create sufficient signals to affect as far away from the RF1 source as possible Shielding the switching card signal leads sources and mca...

Page 60: ...dled properly If connector insulation becomes con taminated the insulation resistance will be substantial ly reduced affecting high impedance measurement P S Oils and salts from the skin can contamina...

Page 61: ...static sensitive devices 5 6 Principles of operation Briefly discusses circuit operation 5 7 Troubleshooting Presents s me troubleshooting tips for the Model 7014 including relay replace ment precaut...

Page 62: ...al and isola tion With the Model 7014 s backplane jumpers installed the performance verification procedures must be per formed with only one multiplexer card the one being checked installed in the Mod...

Page 63: ...ther Zero the multi meter after the thermals have stabilized two hours if from cold start A Model 2001 can be used on the 200mVDC range let it warm up for one hour 2 Set up the test equipment as shown...

Page 64: ...Figure 5 1 Reference junction test 5 4...

Page 65: ...ions be made at inputs 2 and 10 of Bank A as shown in Figure 5 2 Scrv Information 7 Connect OHMS LO and OHMS SENSE LO to the HI H terminal of Bank A 8 Install the Model 7014 in slot 1 CARD 1 of the Mo...

Page 66: ...o Bank A HI and LO as shown in Figure 5 3A 5 Install the Model 7014 in slot 1 CARD 1 of the Model 7001 6 Turn on the Model 7001 and program the unit to close Channel 1 2 Bank A Input 2 7 On the Model...

Page 67: ...Model 7014 A Differential Model 7014 6 Common Mode Figure S 3 Differential offset current te5t connections 5 7...

Page 68: ...82 input leads to HI and LO output Bank A using copper wires 7 Install the Model 7014 in the Model 7001 slot 1 and turn on the Model 7001 8 Allow Models 7001 7014 and 182 to warm up for two hours 9 Se...

Page 69: ...ds connected to the multiplexer 2 Turn on the Model 617 and allow the unit to warm up for two hours before testing Service Information 3 On the Model 617 select the 2pA range and enable zero check and...

Page 70: ...nel isolation 24 Turn off the Model 7001 and connect the Model 617 to the card as shown in Figure 5 6 25 Install the Model 7014 in slot 1 of the Model 7001 and turn on the mainframe 26 Program the Mod...

Page 71: ...Model7014 Figure 5 6 Channel to channel isolation tea t connections i 11...

Page 72: ...Bank B and Input 8 1 19 17 Bank B Input 9 to Bank B Input 10 Bank B and Input 9 1 20 18 Bank C Input 1 to Bank C Input 2 Bank C and Input 1 1 22 19 Bank C Input 2 to Bank C Input 3 Bank C and Input 2...

Page 73: ...acy 3 On the Model 617 select the 2pA range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure WARNING The following steps use high voltage UOOV B...

Page 74: ...ferential and common mode isolation testing 1 2 3 4 5 6 7 8 9 10 BankA Bank A Input 2 Bank A Input 3 Bank A Input 4 Bank A Input 5 Bank A Input 6 Bank A Input 7 Bank A Input 8 Bank A Input 9 Bank A In...

Page 75: ...use a lower resistance range Let the Model 196 warm up for two hours the Model 2001 for one hour 2 Set another Model 196 on the 300mVDC range or a Model 2001 on the 200mVDC range Insert a 2 terminal l...

Page 76: ...t reference junction output voltage VRBF VREF T 273 15 x 0 0002 9 Close Channel 1 on the Model 7014 card and read the output voltage it should equal the VREF just cal culated Adjust trimmer RZO4 until...

Page 77: ...both instruments and allow them to warm up for at least one hour 11 Service Information Fill a Dewar flask or Thermos half full with pea sized ice made from distilled water Fill up the flask with dis...

Page 78: ...Service Information Figure 5 10 Calibration with thermocouple wire 5 18...

Page 79: ...static containers made of plastic or foam Keep these parts in their original containers until ready for installation or use 2 Remove the devices from their protective contain ers only at a properly gr...

Page 80: ...in frame and it then transmits data at that location back to the mainframe Figure 5 13 The mainframe then transmits an acknowledge signal indicating that it requires more data The ROM will then sequen...

Page 81: ...on power up and power down This circuit disables all relays all relays are open during power up and power down periods The PRESET line on the D type flip flop is controlled by the 68302 microprocessor...

Page 82: ...voltages Observe standard safety precautions for dealing with live circuits Failure to do so could re sult in personal injury or death CAUTION Observe the following precautions when troubleshooting o...

Page 83: ...CLK pulses UlOO pin 3 DATA pulses Required condition Comments All voltages referenced to digital ground GND pad Relay voltage Logic voltage Relay bias voltage Reference junction sensor output During...

Page 84: ...5 24...

Page 85: ...6 4 Factory service If the card is to be returned to Keithley Instruments for repair perform the following Replaceable Parts Call the Test Instruments Repair Department at l 800 552 1115 for a Return...

Page 86: ...2 56X1 4 PHILLIPS PAN HD FOR SCANNER SHIELD 2 56Xll4PPH SOCKET FOR U105 SO 72 THERMAL SHIELD FOR RELAYS 7014 308 2 56X5 8 PHILLIPS PAN HD FASTENER FA 245 1 I 2001 TO STANDOFF AND SHIELD 2 56X3 16 PHIL...

Page 87: ...9 2 CONNECTOR SHIM FOR P1002 1003 CAPTIVE SCREW FOR TOP CLAMP CAP lUF 20 50V CERAMIC CAP lUF 20 50V CERAMIC SURGE ARRESTOR CG2 300L CONNECTOR lo PIN CONNECTOR 12 PIN CONNECTOR 48 PIN 3 ROWS RES 205 l...

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Page 89: ...WRRNING LLUILU...

Page 90: ...I iis YY iii3 Y Y 0 iizl M M 2 ry y I iii2 r Y Y Y 1 9 YX Y kzi P f2z e V ul a n 0 I 1 w 2 Y Y Fi 2 Y Y a 2 y Y Y rc Y II 1 e I 2 Y Y YI Y 1 Y Y lizi Y Y a u I 1 w Y Y a I w Y Y z Y Y ii5ii Lx 1 I n I...

Page 91: ...D Q 15 D 0 114 6 D 0 16 D Q u I S n d ICI06 D c B...

Page 92: ...I B I C I D I E I F I G c...

Page 93: ...8 I 7 I 6 I 5 I 4 I 3 I 2 I 1 1 u 0 Fp2 D C I j B...

Page 94: ...A Thermocouple Conversion Tables A l...

Page 95: ...rrection 0t050 5 3994446 o 1 2467754 2 1 9934168 Quartic approximations t the data as a hmction of temperature C in selected temperature ranges The expansion is of the form E a0 alT a2T2 a a where E i...

Page 96: ...the form E a0 a T a2T2 a3T3 a4e whexe EISm mi r lts and T is in deara Celsius Quark Equation Argument Exp Algument Exp Aqtuuent Exp Argument Exp Argument Exp 50 to 900 1 6251434 1 2 0454379 5 2 54 493...

Page 97: ...re E is in microvolts and T is in degrees Celsius 0 01 to I Type B Themoeauples6 T pClhl Error Range PC o I 2 3 a4 Range a Exact Quark Equation Argument Exp Argument Exp Argument Exp Argument Exp Argu...

Page 98: ...s md T is in degrees Celsius EmOr Range OIV Exact Approx 5to 5 5 to 4 60to 30 3to4 3 to 4 18to 17 2l 2 5 3 to I3 I 6 to 6 TYPe E Thermocouple8 Temperatwe Range c Quartir Equation Argunwnt Exp Argument...

Page 99: ...elsius Range PV Exact Approx 2 to 3 100to 80 5 to 6 1 5to 3 8 to 5 24 to 36 210 to MO 2 5to 2 8 110to 1 I to 1 II to 11 06 to 6 Then oeou Temperature Error Range C a 9 Range W Exact Quartic Equation A...

Page 100: ...o 05 180to 200 25 1045 25 to20 60 to 110 9 to 1 4 12to 11 os to 117 S to I3 5 I os 46 to 14 Temperature Range eT Quark Equation 27 to 0 2 to 0 200 to 800 20 0500 0 to 40 oto1370 40 to 1 40 to 1370 6 t...

Page 101: ...rror Range PV Exact Approx 9 t 7 I4 t I3 7 to 3 5 2 to 9 lb 1 I3 Quark approximations to the data asa function of ternperaturr C m selected temperature ranges The expansion ifi of the form E a0 a T a2...

Page 102: ...cover 2 l J Jumper installation 3 4 Jumper removal 3 4 Jumpers 2 4 M Magnetic fields 4 15 Mainframe control 4 l Maximum signal levels 4 l Measurement considerations 4 13 Mixing applications 2 4 Mixing...

Page 103: ...ons 2 9 Static sensitive devices 5 19 T Temperature gradient 4 13 Temperature transducer 1 l Thermister probe 5 15 5 16 Thermocouple measurement error sources 4 13 Thermocouple measurements 2 l Thermo...

Page 104: ...Particular range or function bad specify 0 Batteries and fuses are OK 0 Checked all cables 0 Calibration only m Data required 0 Certificate of calibration required attach any additional sheets as nece...

Page 105: ......

Page 106: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...

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