Home

Manual

1. Figure 2 5 1 Connections for voltage cui E o scanning E Y io HI CH2 Q fo e HI cH3 4 0 Y LO HI CH4 V pi V LO HI CH54 0 p V LO HI z To DMM OUTAT LO Input Voltages Under Test ida HI CH 6 I V E Y Lo HI e t CH74 i LO HI CH8 4 V s V Lo E l HI CH9 6 E Y Lo E A HI CH 107 V 5 LO X OUT B 2000 SCAN Card 2 10 Card Connections and Installation Resistance connections 2 Pole connections Figure 2 6 shows typical 2 pole resistor test connections The 2 pole resistance configuration can be used to test up to ten DUTs Figure 2 6 1 Typical connections for 2 wire resistance CHI z 3 scanning CH2 7 E CH3 EL i Resistors Under Test CH4 47 i CH5 4 i Hs To DMM OUT A g LO Input B CH6 4 i CH7 4 i T Resistors CHB E i Under Test CH9 4 i CH 104 i ouTB 2000 SCAN Card Card Connections and Installation 2 11 4 Pole connections Typical 4 pole resistance connections are shown in Figure 2 7 This general configuration can be
2. R put RParH Magnetic fields When a conductor cuts through magnetic lines of force a very small current is generated This phenomenon will frequently cause unwanted signals to occur in the test leads of a scanning system If the conductor has sufficient length even weak magnetic fields like those of the earth can create sufficient signals to affect low level measurements Two ways to reduce these effects are 1 reduce the lengths of the test leads and 2 minimize the exposed circuit area In extreme cases magnetic shielding may be required Special metal with high permeability at low flux densities such as mu metal is effective at reducing these effects Even when the conductor is stationary magnetically induced signals may still be a problem Fields can be produced by various signals such as the AC power line voltage Large inductors such as power transformers can generate substantial magnetic fields so care must be taken to keep the switching and measuring circuits a good distance away from these potential noise sources At high current levels even a single conductor can generate significant fields These effects can be minimized by using twisted pairs which will cancel out most of the resulting fields Electromagnetic interference EMI The electromagnetic interference characteristics of the Model 2000 Multimeter comply with the electromagnetic compatibility EMC requirements of the European Union EU directives as denote
3. sesssseeeeeeeen eee 3 3 Power up detection scorse 3 3 Scanner option bus query cococcconccnocanononnnonnnancnnnonnnonncnnann nono 3 3 Model 2000 Multimeter front panel scanner controls and SCPI scanner commands eee 3 4 Closing channels 1 side eese tne tpe rein 3 4 Opening channels ott tete 3 4 Selecting measurement function esee 3 5 Configuring scan parameters esee 3 5 SCPI scanner commands eene ene 3 7 Model 2001 2002 front panel scanner controls and SCPI scanner commands eee 3 8 Closing channels 1 rete erre triti 3 8 Opening channels coccion 3 9 Scanning channels seisis easan oiera 3 10 Using the scanner with the buffer esses 3 13 RTD temperature measurements esee 3 14 Typical applications esee 3 16 Resistor testing i e rate peri tea tos eR RAE 3 16 Current measurements esssseseeeeeeeeeeeene 3 19 Measurement considerations eee 3 20 Path isol tion M 3 20 Magnetic fields iiie terree tr ette nite e 3 21 Electromagnetic interference EMI 3 21 Ground Io0ps tereti eiieeii ogei eE 3 22 Keeping connectors clean ese 3 23 Service Information IntrOdUCHON venia 4 2 Handling and cleaning precautions eee 4 2 Handling precautions eee 4 2 S
4. 4 5 Connections for contact potential tests sess 4 7 Connections for same channel isolation tests 4 8 Connections for channel to channel isolation tests 4 9 Connections for HI and LO terminal to chassis ground isolation tests ascen tere er di cet 4 10 Block diagrati ss ada 4 11 List of Tables 3 Table 3 1 4 Table 4 1 Table 4 2 Table 4 3 Operation Summary of SCPI scanner commands esse 3 7 Service Information Recommended verification equipment sess 4 4 Recommended troubleshooting equipment 4 13 Troubleshooting procedure eee 4 14 General Information 1 2 General Information Introduction This section contains general information about the Model 2000 SCAN scanner card The Model 2000 SCAN provides 10 channels of 2 pole relay switching The channels can be con figured for 4 pole operation Section 1 is arranged in the following manner Features Warranty information Manual addenda Safety symbols and terms Specifications Unpacking and inspection Repacking for shipment Features The Model 2000 SCAN is a scanner card designed to be installed in the Model 2000 Multi meter Model 2001 Multimeter and Model 2002 Multimeter Key features include Ten channels of 2 pole relay input Channels configurable for 4 pole operation Multi
5. Scanning channels Scanner channels are scanned by configuring scan channels and programming the Model 2001 or 2002 to perform a scan The following paragraphs outline step by step procedures for performing basic scanning from the front panel and over the IEEE 488 bus Front panel scanning Step 1 Configure channels Use CONFIG CHAN to select the measurement functions for each of the scanner channels as follows 1 Press CONFIG CHAN The instrument will display the following menu CONFIGURE CHANNELS INTERNAL CHANS EXTERNAL INPUTS Select INTERNAL CHANS then press ENTER The multimeter will display the following menu SET INTERNAL CHANS 1 DCV 2 DCV 3 DCV 4 DCV 5 DCV Using the cursor keys select the desired channel press the right cursor key to display channels 6 through 10 Using the range keys select the desired measurement function DCV ACV Q2W Q4W FRQ TMP ALT None Repeat steps 3 and 4 for each of the channels you wish to scan NOTE Select none to omit a channel from the scan list After selecting all measurement functions press ENTER Press EXIT to return to normal display Step 2 Configure and start scan Configure the scan as follows 1 Press CONFIG SCAN The Model 2001 2002 will display the following SCAN OPERATION INTERNAL EXTERNAL Select INTERNAL then press ENTER Press SCAN and follow the prompts to configure scanning See the following paragraphs for det
6. 1 Digital ground P1034 All voltages referenced to digital pin 1 3 5 ground 2 P1034 pin 9 5 VDC Card power supply voltage 3 U101 pin 2 CLOCK pulses Serial clock pulses 4 U101 pin 3 DATA pulses Serial data pulses 5 U101 pin 7 STROBE pulse End of relay update seguence 6 U101 U103 pins 10 18 Low when relay state High when relay is not changing is changed state Relay driver outputs Replaceable Parts 5 2 Replaceable Parts Introduction This section contains replacement parts information schematic diagram and component layout drawing for the Model 2000 SCAN Parts list A parts list for the scanner card is included in a table integrated with schematic diagram and component layout drawing for the board Parts are listed alphabetically in order of circuit designation Ordering information To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Card model number 2000 SCAN Card serial number e Part description e Circuit description if applicable e Keithley part number Factory service If the card is to be returned to Keithley Instruments for repair perform the following e Call the Instruments Division Repair Department at 1 800 552 1115 for a Return Material Authorization RMA number Complete the
7. seriously affect low level measurement accuracy The following paragraphs discuss these effects and ways to minimize them Path isolation The path isolation is simply the equivalent impedance between any two test paths in a measurement system Ideally the path isolation should be infinite but the actual resistance and distributed capacitance of cables and connectors results in less than infinite path isolation values for these devices Figure 3 5 Path isolation resistance Rout 9 R PATH I I Epur l l I DUT Scanner DMM Card R put Source Resistance of DUT E put Source EMF of DUT ReatH Path Isolation Resistance Rin Input Resistance of Multimeter Path isolation resistance forms a signal path that is in parallel with the equivalent resistance of the DUT as shown in Figure 3 5 For low to medium device resistance values path isolation resistance is seldom a consideration however it can seriously degrade measurement accuracy when testing high impedance devices The voltage measured across such a device for example can be substantially attenuated by the voltage divider action of the device source resistance and path isolation resistance as shown in Figure 3 6 Also leakage currents can be generated through these resistances by voltage sources in the system Operation 3 21 Figure 3 6 R pur Voltage attenuation by path isolation resistance E our E pur R PATH Eor
8. 2 2 shows the input output connectors for the card Card connections include CH 1 10 channels 1 10 HI and LO input terminals are provided for each of the 10 channels on the card OUT A HI and LO output connections for all ten channels in the 2 pole mode or channels 1 5 in the 4 pole mode OUT B HI and LO output connections for channels 6 10 in the 4 pole mode In order to gain access to the connections first open the plastic shield by pressing in on the locking tab Swing the shield away from the circuit board Figure 2 2 Channels 1 5 OUT A Channels 6 10 OUT B Card connectors HA ja LJ H LJ H LJ H LJ H L A LJIH LJIH LJ H LJ H LJ IH L CH1 CH2 CH3 CH4 CH5OUTA CH6 CH7 CH 8 CH9 CH 10 OUT B t Locking Tab Plastic Shield 2 6 Card Connections and Installation Wiring procedure Perform the following procedure to wire circuitry to the screw terminals on the scanner card WARNING Make sure all power is off and any stored energy in external circuitry is discharged before connecting or disconnecting wires CAUTION Mechanical shock may open or close latching relays on the scanner card Before enabling any external sources open all relays by inserting the Model 2000 SCAN into the multimeter and turning on the power 1 Open the plastic shield to gain access to the connectors 2 Strip approximately 5 16 of insulation from the end of each wire then twist the strands together NOTE 22 AWG stranded wire is r
9. 2 pole operating mode Selecting measurement function This section describes how to select a specific measurement function for an internal channel 1 Use the and gt keys to select the desired channel 2 Select the desired measurement function with the keys on the front panel The various measurement functions available are DCV DC volts PERIOD period ACV AC volts TEMP simulated temperature Q2W 2 wire ohms CONT continuity Q4W 4 wire ohms channels 1 5 DH diode test FREQ frequency Configuring scan parameters This section details how to select internal scanning and how to configure the scan parameters Front Panel Use the SHIFT CONFIG keys to select the scan type and configure the scan parameters 1 Press SHIFT then CONFIG The instrument will display the following prompt for internal scanning TYPE INT Use the A or V key if EXT is displayed Then press ENTER 2 The following message will be displayed MIN CHAN 1 Use the A and Y keys to select the channel at which the scanning will begin then press ENTER 3 The unit will then display the following message MAX CHAN 10 Use the gt A and Y keys to select the channel at which the scanning will stop then press ENTER 3 6 Operation 4 The instrument will then display the following message TIMER OFF Use the or key to select the ON option if desired then press ENTER Select the scan time when prompted then press ENTER 00
10. 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Card Connections and Installation Model 2000 SCAN simplified schematic 2 4 Card eunizen op 2 5 Output connections essere enne eene nennen 2 7 Routing wires through cable clamp seessss 2 8 Connections for voltage scanning ooconccnocnnoncnnnnoncnnnonnnanaranonoos 2 9 Typical connections for 2 wire resistance scanning 2 10 Typical connections for 4 wire resistance scanning 2 11 Current shunt locations eee 2 12 Current connections sssrini eee enne 2 14 Card installation visos dia 2 16 2 pole output connections c coocccoccconcnconnnnonoconannnnnconcnnnncconcnnnno 2 17 4 pole output connections eseeseeeeneeen een 2 18 Operation 2 wire resistance test connections 0 eects eeeeeeeeeeeneees 3 16 4 wire resistance test connections oooooccnnnconnnoncnnnonnconnnnncnnno 3 17 Combining 2 pole and 4 pole switching Model 2001 2002 cessent 3 18 Connections for current measurements sese 3 19 Path isolation resistance eese 3 20 Voltage attenuation by path isolation resistance 3 21 Power line ground loops eee 3 22 Eliminating ground loops eee 3 22 Service Information Connections for path resistance checks
11. O CH 8 4 O hd O CH9 O O CH 107 Q Note Current shunts must be ES O installed for channels OUT B 1 and 6 rc O 2000 SCAN Card Card Connections and Installation 2 15 Card installation and removal This paragraph explains how to install and remove the Model 2000 SCAN card assembly from the Model 2000 Multimeter WARNING Installation or removal of the Model 2000 SCAN should be performed only by qualified service personnel Failure to recognize and observe standard safety precautions could result in personal injury or death NOTE To prevent contamination to the scanner card that could degrade performance handle the card assembly only by the card edges and covers Wiring connections must made before installing the scanner card See Typical connecting schemes on page 2 9 for wiring details 2 16 Card Connections and Installation Scanner Card Installation Perform the following steps and refer to Figure 2 10 to install the card assembly in the multimeter WARNING Turn off power to all instrumentation including the multimeter and disconnect all line cords Make sure all power is removed and any stored energy in external circuitry is discharged Figure 2 10 Card installation Note Card installation in a Model 2001 2002 is shown For installation in Model 2000 turn card over 1 Remove the cover plate from the OPTION SLOT on the rear panel of the multimeter To Do so pry out the tw
12. TAIWAN 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 82251886 Fax 8610 82251892 Halsuantie 2 e 00420 Helsinki Finland 09 53 06 65 60 Fax 09 53 06 65 65 3 all e des Garays 91127 Palaiseau C dex e 01 64 53 20 20 Fax 01 60 11 77 26 Landsberger Strasse 65 82110 Germering 089 84 93 07 40 e Fax 089 84 93 07 34 Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 19 1 5 Eagles Street Langford Town Bangalore 560 025 080 212 80 27 Fax 080 212 80 05 Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 Postbus 559 4200 AN Gorinchem 0183 63 53 33 Fax 0183 63 08 21 c o Regus Business Centre Frosundaviks All 15 4tr 16970 Solna 08 50 90 46 00 Fax 08 655 26 10 13F 3 NO 6 Lane 99 Pu Ding Road Hsinchu Taiwan ROC 886 3 572 9077 Fax 886 3 572 9031 O Copyright 2003 Keithley Instruments Inc Printed in the U S A 5 03
13. and 2 for 4 pole switching Operation 3 19 Current measurements Although the Model 2000 SCAN is not intended for direct current measurements on card shunt resistors can be installed for channels 1 and 6 to allow for indirect current measurements Figure 3 4 shows the typical configuration for current measurements Refer to Section 2 of this manual for specific information on recommended shunt resistors and their installation Figure 3 4 User installed Shunts Connections for current 2000 SCAN measurements CH Le HI Out A o o LO M 000 1 eeooo Q amp al 0 5 DMM Rear Panel CH 6 Model 2001 2002 DUTs 2 A Test Configuration User installed Shunt T T f T ejje DMM 2000 SCAN DUT B Simplified Equivalent Circuit The current through each shunt resistor can be calculated as follows Where I current being determined V voltage measured by multimeter R shunt resistance value Instead of manually calculating current set up a Model 2000 2001 2002 mX b math calculation function Here m 1 R and b 0 The multimeter will then display the actual current value Refer to the multimeter Manuals for details on using math functions 3 20 Operation Measurement considerations Many measurements made with the Model 2000 SCAN are subject to various effects that can
14. service form at the back of this manual and include it with the card e Carefully pack the card in the original packing carton e Write ATTENTION REPAIR DEPT and the RMA number on the shipping label NOTE Itis not necessary to return the Model 2000 Multimeter with the card Replaceable Parts 5 3 Component layout and schematic diagram A component layout drawing and schematic diagram are included on the following pages integrated with the parts list for the Model 2000 SCAN Model 2000 SCAN parts list Keithley part Circuit desig Description no Card Ejector FA 237 Clip Strain Relief 2001 351 Shield Scanner Bottom 2001 341 Shield Scanner Top 2001 342 Sleeved Banana Plug Test Lead CA 109 Strain Relief Bottom 2001 344 Strain Relief Top 2001 349 Strip Polyurethane 2001 345 1 C101 103 105 106 CAP 1UF 20 50V CERAMIC C 365 1 C107 CAP 100UF 20 25V ALUM ELEC C 413 100 J1035 1036 CONN FEMALE 12 PIN CS 768 12 K101 111 RELAY MINATURE DPDT TQ2E L2 5V RL 155 P1034 CONN FEMALE DUAL 16 PIN CS 455 R134 RES 1K 5 1 4W COMPOSITION OR FILM R 76 1K R147 RES 4 7K 5 1 4W COMPOSITION OR FILM _ R 76 4 7K U101 103 IC 8 BIT SERIAL IN LATCH DRIVER 5841A IC 536 U104 IC SUPPLY VOLTAGE SUPERVISOR TL7705AC IC 602 5 4 Replaceable Parts 2001 170 SCANNER BOARD REVISION CONTROL ON 1 l 15066 REVISED 2 e NOTE LEADS ON BOTTOM SIDE DF 2001 172 SCANNER BOA
15. the LO terminals of channels 1 through 10 Be sure the electrometer is connected to the LO terminals of the two channels being tested and that channel 1 is closed 4 10 Service Information 21 With the electrometer voltage source in standby connect the electrometer to channel 1 HI and chassis ground as shown in Figure 4 5 Figure 4 5 Banana to Banana Cable Model ah Unterminate Connections for HI and Ground Link Triax Cable LO terminal to chassis Removed ground isolation tests HI HI NT 72 V Source 1l Red Channel lo x V Source HI Model 617 Channel 2 4 Source V and HI oto Measure V I Channel 510 e e e OUTA Unterminated to Banana Cable OUTB i Chassis Ground 4 Pole Pe Ch I HI 9 971 9 71 anne o x Channel 7 9 E X h I HI je cial Channe o L 22 23 24 25 26 27 Model 2000 SCAN Program the Model 2000 to close channel 1 On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to settle verify that it is gt 1GQ 10 Put the electrometer in standby and enable zero check Repeat steps 21 through 25 for channels 2 through 10 One electrometer lead should be connected to the HI terminal of the channel being testing and the other lead should be connected to chassis ground Repeat steps 21 through 26 for channels 1 through 10 LO terminals One electrometer lead should be connected to
16. the following BUFFER SIZE 00010 4 Using the cursor and range keys select the number of readings to store Usually this number will be the same as the number of channels you are scanning For example if you are using all 10 scanner channels select 10 readings 5 Press ENTER to complete programming data storage then EXIT to return to normal display Step 3 Configure scan perform scan and recall readings 1 From normal display press CONFIG SCAN The instrument will display the following SCAN OPERATION INTERNAL EXTERNAL 2 Select INTERNAL then press ENTER 3 Press SCAN then follow the prompts See Configuring scan parameters 3 14 Operation RTD temperature measurements RTD temperature measurements are possible when the Model 2000 SCAN card is installed in the Model 2001 or Model 2002 Multimeter The following paragraphs outline the procedures for making temperature measurements from the front panel using the scanner For more detailed information on temperature measurements in general refer to the multimeter manuals Step 1 Connect RTD probes Connect RTD probes to the scanner using the basic resistance connections outlined in the multimeter manual For 4 wire probes pair the connections as follows Channels 1 and 6 probe 1 Channels 2 and 7 probe 2 Channels 3 and 8 probe 3 Channels 4 and 9 probe 4 Channels 5 and 10 probe 5 Step 2 Select sensor type and units 1 A From normal disp
17. 0 05 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 KOREA 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Postbus 559 4200 AN Gorinchem 0183 63 53 33 Fax 0183 63 08 21 SWEDEN c o Regus Business Centre Frosundaviks All 15 4tr e 16970 Solna 08 50 90 46 00 Fax 08 655 26 10 TAIWAN 13F 3 NO 6 Lane 99 Pu Ding Road Hsinchu Taiwan ROC 886 3 572 9077 Fax 886 3 572 9031 5 03 Model 2000 SCAN Scanner Card Instruction Manual 1994 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Fifth Printing July 2003 Document Number 2000 SCAN 901 01 Rev E Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history p
18. 6 is for channel 6 Figure 2 8 R145 Channel 1 shunt R146 Channel 6 shunt Current shunt locations QH 1 CH2 CH3 CH4 eser CH7 CH 8 CH 9 CH 10 OUT B LHYLJLH LJ H Ly pa LJ H LJ H tj Fo of of LH LJ H LJ H LJIH L H L H tj Fo Recommended current shunt values Hole spacing on the circuit board is intended for 1 4W resistors The resistance value will depend on the current you intend to measure 1k resistors should be optimum for many applications A 1kQ resistor will allow you to switch currents up to 15mA without exceeding the power rating of the resistor For larger currents decrease the shunt value Conversely the shunt value can be increased for smaller currents CAUTION Do not exceed the maximum card signal levels DC signals 110V DC 1A switched 30 VA maximum e AC signals 125V AC rms or 175V AC peak 1A switched 62 5 VA maximum Card Connections and Installation 2 13 Board cleaning NOTE Failure to observe the following precautions may result in degraded card performance When soldering resistors be sure not to touch areas not associated with resistor installation or spread flux around to other areas of the circuit board Use solder with an OA organic activated flux The circuit board should be thoroughly cleaned with pure water after soldering to remove all contaminants After cleaning with water swab the area with pure methanol then allow the board to dry for several hours i
19. 88 bus commands used to control the scanner card IEEE 488 bus scanner commands Summarizes bus commands necessary to control the scanner card by either the Model 2000 or Model 2001 2002 Multimeters Model 2001 2002 front panel scanner controls and IEEE 488 bus scanner commands Gives and overview of the Model 2001 2002 Multimeter front panel controls and corresponding IEEE 488 bus commands used to control the scanner card RTD temperature measurements Provides detailed information on using RTD probes when scanning Model 2001 2002 Typical applications Discusses typical applications for the Model 2000 SCAN Measurement considerations Discusses a number of measurement considerations that should be taken into account when using the scanner NOTE _ Before using the Model 2000 SCAN scanner card you should be thoroughly familiar with the operation of the Model 2000 2001 2002 Multimeter See the multimeter manual for details Operation 3 3 Signal limitations CAUTION _ To prevent damage to the Model 2000 SCAN do not exceed the maximum signal level specifications of the card Relay input signal limitations Channels 1 10 are all relay inputs To prevent over heating or damage to the relays never exceed the following maximum signal levels for these channels DC signals 110V DC 1A switched 30VA resistive load AC signals 125V rms or 175V AC peak 1A switched 62 5VA resistive load Scanner card detectio
20. CHANTABILITY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAMAGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com Sales Offices BELGIUM Bergensesteenweg 709 e B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 82251886 Fax 8610 82251892 FINLAND Halsuantie 2 00420 Helsinki Finland 09 53 06 65 60 Fax 09 53 06 65 65 FRANCE 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 19 INDIA 1 5 Eagles Street e Langford Town Bangalore 560 025 080 212 80 27 Fax 080 212 8
21. H 00M 01 0005 5 The unit will then display the following message RDG CNT 0010 Use the gt A and Y keys to select the desired number of readings of the selected list to be taken and stored by the instrument Then press ENTER The instrument will store in memory the number of readings specified with RDG CNT After the scanning has been completed these readings can be accessed by pressing the RECALL key on the front panel and then using the gt A and Y keys to scroll through the stored readings 6 The following are the options to start the scanning STEP Pressing the STEP key on the front panel will direct the instrument to begin scanning at Channel 1 and scan the number of channels specified with RDG CNT It will store the same number of readings TRIG Pressing the TRIG key on the front panel will direct the instrument to begin scanning at the present channel setting and scan the number of channels specified with RDG CNT It will store the same number of readings SCAN Pressing the SCAN key on the front panel will direct the instrument to scan through the channels specified with MIN CHAN and MAX CHAN and store the number of readings specified by RDG CNT 7 Pressing EXIT will clear the current readings and reset the channel to Channel 1 Remote interface Use the ROUTe SCAN LSELect command to select internal or external scanning For example to select internal scanning use the following command
22. KEI THLEY Model 2000 Scan Scanner Card Instruction Manual A GREVEIBER MEASUR EMOS ONFIDENCE WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of year from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be defective To exercise this warranty write or call your local Keithley representative or contact Keithley headquarters in Cleveland Ohio You will be given prompt assistance and return instructions Send the product transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period or at least 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 also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to follow instructions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MER
23. Model 2001 2002 shown DUTs 10 A Test Configuration OO Q ER oo Multimeter 2000 SCAN DUT B Simplified Equivalent Circuit 4 wire resistance tests More precise measurements over a wider range of system and DUT conditions can be Operation 3 17 obtained by using the 4 wire measurement scheme shown in Figure 3 2 Here separate sense leads from the Model 2000 Multimeter are routed through the scanner to the resistor under test The extra set of sense leads minimizes the effects of voltage drops across the test leads greatly reducing measurement errors with lower DUT resistances Note however that an extra two poles of switching are required for each resistor tested For this reason only five resistors can be tested using this configuration Figure 3 2 4 wire resistance test connections 2000 SCAN of Out A i Hs Ea 1 S 1 Se Sail ense 5 HI i o o meos je DUTs 000 ae 5 LO i DMM Rear Panel eo Model 2001 2002 shown 43 Sense Y LO 0 Out B A Test Configuration 2001 p eT Sense HI dcs R i Sense LO dg 2000 SCAN DUT B Simplified Equivalent Circuit 3 18 Operation Combining 2 pole and 4 pole switching Models 2001 2002 T
24. ONFIG STORE to program the number of readings to store 10 Press ENTER to begin scanning at the following prompt 11 Press ENTER to begin 0010 scans of 10 channels 12 The instrument will then scan using selected scanning parameters If you elected to store data in memory the instrument will display the reading number on the bottom line of the display as readings are stored 13 After readings are stored the following will be displayed SCAN COMPLETE RECALL DATA SCAN AGAIN EXIT 14 Select the desired operation then press ENTER 3 12 Operation Remote interface scanning Step 1 Program channel functions Use ROUT SCAN INT FUNC to program functions for the selected channels For example assume that you want to measure DC volts on channel 1 AC volts on channel 2 and 2 wire resistance on channel 3 The commands to do so are as follows PRINT 1 output 16 rout scan int func 1 volt dc PRINT 1 output 16 rout scan int func 2 volt ac PRINT 1 output 16 rout scan int func 3 res If on the other hand you wish to use the same function DCV for example on all three channels a single command would suffice PRINT 1 output 16 rout scan int func 1 2 3 volt dc Step 2 Program internal scan list and start scan Use the ROUT SCAN INT command to program a scan list channels you wish to scan For example assume that you wish to scan channels 1 2 and 3 This scan list would be progr
25. PRINT 1 output 16 route scan lselect internal If you have selected internal use the following command to set the list of channels to be scanned PRINT 1 output 16 route scan internal scan list For example to scan channels 1 through 10 inclusively PRINT 1 output 16 route scan internal 1 10 Operation 3 7 SCPI scanner commands Table 3 1 summarizes commands that control scanner operations over the remote interface For more detailed information on these and other bus commands refer to the multimeter manuals The commands and comments in italics are valid only when the Model 2000 SCAN card is installed in a Model 2001 or Model 2002 Multimeter Table 3 1 Summary of SCPI scanner commands Command Description ROUTe Route subsystem CLOSE lt list gt Close channels STATe Return all closed channels OPEN lt list gt lALL Open channels ALL Open any closed channels MULTiple Multiple channel commands CLOSE list Close specified channels 1 thru 11 STATe Query closed channels OPEN lt list gt Open specified channels SCAN Scanning commands INTernal lt scan list gt Program internal scan list FUNCtion lt list gt lt function gt Program channel functions EXTernal lt scan list gt Program external scan list LSELect NONE INTernal EXTernal Select scan list SENSe 1 Sense subsystem FUNCTIon function list Select measurement function ALTernate 1 Pro
26. RD TO BE TRIMMED TO E MC 612 T0P SIDE 040 MAX LENGTH AFTER FLOW SOLDER PLACE AS CLOSE TO FEEDTHROUGHS AS POSSIBLE NOTE DO NOT INSTALL R145 R146 o A i wo eoo0o000 O 00000000 00000000 U101 a s e U103 5 gt U102 6 gt 1 o o 00000000 00000000 o o 00000000 z o o o o z o oo o o o oo o o Ma Lui o oo o o x a o oo o m H o i i gt o 9 0 9 o o oO Bm m o i A AFA FA an Emco 7 5 exon B EIE ES i a amp y ILL n m 8134 O o o o o o Q o o OQ e Q Wo cI 4 3 2001 171 i SCANNER BOARD 4 Em TOP SIDE COMPONENTS E NOTE FOR MORE COMPONENT INFORMATION REFER 2d TO 200 PRODUCT STRUCTURE pme ns mamar oa we ER SCANNER BORRD i ETE fe cepe HET FINISH e 8 7 6 e 4 3 e 1 CHANNEL 6 CHANNEL 7 CHANNEL 8 CHANNEL 9 CHANNEL 10 DUTPUT B EN A HI Lo HI Lo HI Lo HI LO Lo HI HI Lo HI Lo Vv Vv Vv Ji J1036 J1035 J1035 1036 2036 1036 2036 E105 a g1036 11 036 l 11 1 107 R238 R139 n Ei R143 100 9 10 J1035 1J1035 EZ NC V V HI Lo A P1034 4 13 y CHANNEL 5 RESET g 6 AJLO3S J1035 P1034 CHANNEL 4 Lo HI Lo HI Lo HI E CHANNEL 3 CHANNEL 2 CHANNEL 1 n KEITHLEY ER C105 5 0 1UF SCHEMATIC m DO NOT INSTALL 8 SCANNER CARD W B IS Td MODEL D eco B D ma 2001 176 15066 pum y em A Ed 2 1 Specifications A 2 Specifications GENERAL 10 Channels 10 channels of 2 pole relay input All channels configurabl
27. SE HI and connect OUT B LO black to SENSE LO See Figure 2 12 Figure 2 12 Input HI 4 pole output connections Input LO Sense HI Out A HI Red Out B HI Red LO Black Out A LO Black Note Card installation in a Model 2001 2002 is shown For installation in Model 2000 turn card over Scanner card removal Follow the steps below to remove the scanner card from the multimeter WARNING Turn off power to all instrumentation including the multimeter and disconnect all line cords Make sure all power is removed and any stored energy in external circuitry is discharged 1 Unlock the card by pulling the latches outward Carefully slide the card out of the multimeter 3 Ifthe multimeter is to be operated without the scanner card installed install the cover plate over the OPTION SLOT 3 Operation 3 2 Operation Introduction This section contains detailed information on front panel and IEEE 488 bus operation of the Model 2000 SCAN The information in this section is organized as follows Signal limitations Summarizes the maximum signals that can be applied to the Model 2000 SCAN Scanner card detection Discusses how the scanner card is detected and how to determine whether or not the card is installed with a bus command Model 2000 front panel scanner controls and IEEE 488 bus scanner commands Gives an overview of the Model 2000 Multimeter front panel controls and corresponding IEEE 4
28. age Revision A Document Number 2000 SCAN 901 01 csse November 1994 Revision B Document Number 2000 SCAN 901 01 sese February 1995 Addendum B Document Number 2000 SCA 901 02 essere April 1995 Addendum B Document Number 2000 SCA 901 03 eee December 1995 Revision C Document Number 2000 SCAN 901 01 esee May 1998 Revision D Document Number 2000 SCAN 901 01 eese April 1999 Revision E Document Number 2000 SCAN 901 01 eese July 2003 All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders SUE Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some instruments and accessories would normally be used with non hazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read and follow all installation operation and maintenance information carefully before using the product Refer to the manual for complete product specifications Tf the product is used in a manner not specified the protection provided by the product may be impaired The typ
29. ails Operation 3 11 Using SCAN to configure scan parameters Once the internal or external scan list is enabled you use the SCAN key to configure scan count scan interval and enable buffer storage The steps below outline the basic procedure for using the SCAN key to configure internal scanner operation 1 From normal display press CONFIG SCAN The instrument will display the following SCAN OPERATION INTERNAL EXTERNAL 2 Select INTERNAL then press ENTER 3 Press SCAN The unit will display the following message SCAN COUNT 00010 4 Using the range and cursor keys select the number of scan sequences then press ENTER The instrument will display the following USE SCAN TIMER YES NO 5 If you do not wish to use the scan timer interval between scans select NO then press ENTER and go on to step 7 If you wish to use and program the interval between scans select YES then press EN TER The instrument will display the following INTRVL 000002 500 6 Using the range and cursor keys select the desired interval between scan sequences then press ENTER 7 The instrument will then prompt you as to whether or not you wish to store data in the buffer as follows DATA TO MEMORY NO YES 8 To store scanned data in the buffer select YES otherwise choose NO then press ENTER 9 If you elected to store data in memory the instrument will prompt you as follows 00100 RDGS TO BUFFER Press ENTER to continue NOTE Use C
30. ammed as follows PRINT 1 output 16 rout scan int 1 2 3 Scanning will begin immediately when this command is sent To disable scanning send the ROUT SCAN LSEL NONE command PRINT 1 output 16 rout scan lsel none NOTE The ABORT command will abort the present scan in progress and reset the channel list to the beginning Depending on various trigger layer parameters ABORT may also stop the scanning process Operation 3 13 Using the scanner with the buffer The Model 2001 internal buffer can be used to store readings taken while using the scanner The following paragraphs outline the steps necessary for fundamental data storage of scanner readings Step 1 Configure channel 1 Press CONFIG CHAN The instrument will display the following CONFIGURE CHANNEL INTERNAL CHANS EXTERNAL INPUTS 2 Select INTERNAL CHANS The Model 2001 2002 will display the following SET INTERNAL CHANNELS 1 DCV 2 DCV 3 DCV 4 DCV 5 DCV 3 Use the cursor and range keys to select channels and functions then press ENTER when you have set all functions 4 Press EXIT to return to normal display Step 2 Configure buffer 1 Press CONFIG STORE The unit will display the following CONFIG DATA STORE BURST MODE DATA GROUP CONTROL CLEAR ALL COUNT FEED 2 Select COUNT then press ENTER The instrument will display the following SET BUFFER SIZE ENTER COUNT USE TRIGGER MODEL 3 Select ENTER COUNT and press ENTER to view
31. anner card output connections and describes how to remove the card Handling precautions To maintain high impedance isolation between channels care should be taken when handling the scanner card to avoid contamination from such foreign materials as body oils Such contamination can substantially lower leakage resistances degrading card performance To avoid possible contamination always grasp the scanner card by the side edges or covers Do not touch board surfaces components or areas adjacent to electrical contacts Dirt build up over a period of time is another possible source of contamination To avoid this problem operate the multimeter and scanner card in a clean environment If the card becomes contaminated it should be thoroughly cleaned as explained in Section 4 Handling and cleaning precautions Connections Card Connections and Installation 2 3 This paragraph provides the information necessary to connect your external test circuitry to the scanner card NOTE All connecting wires or leads must be connected to the card before it is installed in a multimeter Connection precautions WARNING Connection information for the Model 2000 SCAN is intended for qualified service personnel Do not attempt to connect the DUT or external circuitry to a scanner card unless qualified to do so To prevent electric shock that could result in serious injury or death adhere to the following safety precautions e Before maki
32. anual explains hazards that could damage the scanner card Such damage may invalidate the warranty Specifications Model 2000 SCAN specifications are found in Appendix A These specifications are exclu sive of the multimeter specifications 1 4 General Information Unpacking and inspection Inspection for damage The Model 2000 SCAN is packaged in a re sealable anti static bag to protect it from damage due to static discharge and from contamination that could degrade its performance Before removing the card from the bag observe the precautions below on handling Handling precautions Always grasp the card by the side edges and covers Do not touch the board surfaces or components When the card is not installed in a multimeter keep the card in the anti static bag and store it in the original packing carton After removing the card from its anti static bag inspect it for any obvious signs of physical damage Report any such damage to the ship ping agent immediately Shipment contents The following items are included with every Model 2000 SCAN order e Model 2000 SCAN Scanner Card e Model 2000 SCAN Instruction Manual e CA 109 test lead set for output connections two red two black e Additional accessories as ordered Instruction manual If an additional Model 2000 SCAN Instruction Manual is required order the manual pack age Keithley part number 2000 SCAN 901 00 The manual package includes an instruction manua
33. ath isolation Contact potential Path resistance Path isolation Scanner card connections Jumper wires or connecting cables can simply be hard wired directly to the screw terminals of the Model 2000 SCAN Detailed connection information is provided in Section 2 Path resistance tests Perform the following steps to verify that the path resistance of each channel is with specified values 1 Connect the HI and LO terminals of all 10 channel inputs together to make one common terminal using 22AWG solid copper jumper wires see Figure 4 1 NOTE Make sure that all jumper wires are clean and free of oxides ON RU I Connect the output cables to OUT A HI and LO as shown in Figure 4 1 With the power off install the scanner card in the Model 2001 Multimeter Turn on the Model 2001 and allow it to warm up for one hour before proceeding Select the O2W function and the 20 range on the Model 2001 Temporarily connect a second set of output leads identical in length and type to the leads connected to the scanner card output to the Model 2001 rear panel HI and LO INPUT jacks Be sure to select the rear panel terminals with the front panel INPUT switch 7 Short the free ends of the temporary leads together and allow the reading to settle Enable the Model 2001 REL mode after settling and leave REL enabled for the remainder of the path resistance tests Service Information 4 5 8 Disconnect the temporary leads from the mul
34. blem and check boxes that apply to problem Q Intermittent A Analog output follows display Q Particular range or function bad specify L IEEE failure Q Obvious problem on power up L Batteries and fuses are OK L Front panel operational U All ranges or functions are bad Q Checked all cables Display or output check one A Drifts Q Unable to zero AU Unstable A Overload Q Will not read applied input Q Calibration only Q Certificate of calibration required Q Data required attach any additional sheets as necessary Show a block diagram of your measurement including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user please describe Be sure to include your name and phone number on this service form Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KENT HLEY Keithley Instruments Inc Sales Offices BELGIUM CHINA FINLAND FRANCE GERMANY GREAT BRITAIN INDIA ITALY JAPAN KOREA NETHERLANDS SWEDEN
35. d by the CE mark However it is still possible for sensitive measurements to be affected by external sources In these instances special precautions may be required in the test setup Sources of EMI include e Radio and television broadcast transmitters Communications transmitters including cellular phones and hand held radios Devices incorporating microprocessors and high speed digital circuits Impulse sources as in the case of arcing in high voltage environments The instrument measurement leads and other cables should be kept as far away as possible from any EMI sources Shielding measurement leads and the multimeter may reduce EMI to acceptable levels In extreme cases a specially constructed screen room may be required to sufficiently attenuate troublesome signals 3 22 Operation have detrimental effects on the measurement Ground loops Figure 3 7 loops Many instruments incorporate internal filtering that may help reduce EMI effects In some Power line ground cases additional external filtering may be required Keep in mind however that filtering may voltage will be added to the source voltage affecting the accuracy of the measurement Instrument 1 When two or more instruments are connected together care must be taken to avoid unwanted signals caused by ground loops Ground loops usually occur when sensitive instrumentation is connected to other instrumentation with more than one signal retu
36. d inspection eese 1 4 Inspection for damage seeeeeeeee 1 4 Handling precautions eene 1 4 Shipment contents esses nennt 1 4 Instruction manual eene 1 4 Repacking for shipment esee 1 4 Card Connections and Installation Intro GUC TOM e it 2 2 Handling precautions sese 2 2 CONMECU NS E S 2 3 Connection precautions esee 2 3 Card configuration sess 2 4 Card Connectors iun eene eee genes 2 5 Wiring procedure sees nennen 2 6 Output connections esseesseeeeeeeeeeeene enne nnne enne en 2 7 Dressing leads eese neret 2 8 Typical connecting schemes eee 2 9 Voltage connections essere neret 2 9 Resistance connections esesseeeeeeeeeeeeeenerenneenne 2 10 Current measurements essere nene 2 12 Card installation and removal eese 2 15 Scanner Card Installation esee 2 16 Output connections to multimeter eeeeeee 2 17 Scanner card removal ccnnnncccnncnononoannnnononannnononnnnnnnnncnonono 2 18 Operation Introd ction ini aa 3 2 Signal hmltations rra tti etr tn tet eund 3 3 Relay input signal limitations ooooonnonnncnnonnnonnoncnononnnnncrnonoos 3 3 Scanner card detection
37. e to 4 pole Relay Type Latching electro mechanical Actuation Time lt 3 5ms Safety Conforms with European Union Directive 72 23 EEC EMC Conforms with European Union Directive 89 336 EEC CAPABILITIES Multiplex one of ten 2 pole or one of five 4 pole signals into DMM INPUTS Maximum Signal Level DC Signals 110V DC CAT I 1A switched 30VA maximum resistive load AC Signals 125V AC rms CAT I or 175V AC peak 100kHz maximum 1A switched 62 5VA maximum resistive load Contact Life 2105 operations at maximum signal level gt 10 operations cold switching Contact Resistance 1W at end of contact life Contact Potential lt 500nV typical per contact luV max lt 500nV typical per contact pair luV max Connector Type Screw terminal 22 AWG wire size Isolation Between Any Two Terminals gt 10 W lt 75pF Isolation Between Any Terminal and Earth 109w 150pF Common Mode Voltage 350V peak between any terminal and earth Maximum Voltage Between Any Two Terminals 200V peak Maximum Voltage Between Any Terminal and Mainframe Input LO 200V peak ENVIRONMENTAL Operating Environment Specified for 0 C to 50 C Specified to 8096 R H at 35 C Storage Environment 40 C to 70 C DIMENSIONS WEIGHT 21mm high Y 72mm wide Y 221mm deep 0 83 in Y 2 83 in Y 8 7 in Adds 0 4kg 10 oz SCANNER CONFIGURATION HI oo TO Channel 1 LO o 0o Channel 2 4 HI o orT OHI
38. ecommended for scanner card connections Loosen the screw terminal then insert the wire into the access hole While holding the wire in place tighten the connector screw securely Repeat steps 1 through 3 for each wire to be connected Dress input wires through the cable clamp as discussed in Dressing leads on page 2 8 ON a Card Connections and Installation 2 7 Output connections Use the supplied test leads for scanner output connections Connect red leads to the output OUT A and OUT B HI terminals and connect black leads to the output LO terminals See Figure 2 3 for details Dress output test leads through the cable clamp as described in Dressing leads on page 2 8 After all wires are connected and secure close the plastic shield and secure it with the locking tab NOTE Ifyou intend to use the scanner card only in the 2 pole mode it is not necessary to connect output leads to both OUT A and OUT B Use only OUT A for the 2 pole mode After the scanner card is installed the output leads must be connected to the multimeter rear panel input jacks See Output connections to multimeter on page 2 17 for details Figure 2 3 Output connections HI jie DMM HI To DMM LO Input LO Sense Black Black I IH LJIH LJ H LJ H LJ H tj h U CH6 CH7 CH8 CH9 CH 10 O Red LH Lj H EA t H LA tJ CH1 CH2 CH3 CH4 CH 50 Note OUT B connections not required
39. emove power from the circuit before making connection changes 6 Set the Model 617 voltage source for 100V and select the 200nA current range Make sure the voltage source is still in standby 7 Place the Model 617 in the V I measurement function by pressing SHIFT OHMS 8 With the Model 617 in standby connect the electrometer to OUT A HI and LO terminals of the scanner card as shown in Figure 4 3 Figure 4 3 Banana to Banana Cable Mende d Connections for same nterminate Triax Cable channel isolation tests Ground Link Removed Ch I HI 97 6 annel 1 LO lt V Source HI Model 617 Channel 2 4 aA ox EN Source and channels ie pa OUTA Measure V I Unterminated to LO o o ALO Banana Cable o Hil OUT B SLO l 4 Pole Pp 2 Pole HI o o To Channel 6 i LO 9 31 Channel 7 9 3 HI ooto Channel o Le Model 2000 SCAN Figure 4 4 Connections for channel to chan nel isolation tests 10 11 12 13 14 15 16 17 18 19 20 Service Information 4 9 Close channel 1 using the CHAN key see Path resistance tests on page 4 4 for details On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to settle verify that the reading is gt 1GQ 10 Q This measurement represents the isolation resistance between the HI and LO ter
40. environment for several hours before use Performance verification The following paragraphs discuss performance verification procedures for the Model 2000 SCAN including path resistance contact potential and isolation NOTE Contamination will degrade the performance of the card To avoid contamination always grasp the card by the side edges and covers Do not touch connector insulators board surfaces or components Failure of any performance verification test may indicate that the scanner card is contaminated See Handling and cleaning precautions on page 4 2 for information on cleaning the card Environmental conditions All verification measurements should be made at an ambient temperature between 18 and 28 C and at a relative humidity of less than 70 4 4 Service Information Recommended equipment Table 4 1 summarizes the equipment necessary for performance verification along with an application for each item Table 4 1 Recommended verification equipment Description Model part Specifications Application Multimeter Keithley 2001 200 72ppm Control card measure path resistance Electrometer with voltage Keithley 617 10pA 100pA 1 6 Path isolation source Sensitive Digital Voltmeter Triax cable unterminated Low thermal cable 22AWG solid copper wire 22AWG Teflon insulated stranded wire Keithley 182 Keithley 7025 Keithley 1484 100V source 0 2 3mV 60ppm Contact potential P
41. es of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equip ment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products Only properly trained service personnel may perform installation and service procedures Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient over voltages Measurement Category II con
42. for 2 pole operation Plastic shield not shown 2 8 Card Connections and Installation Dressing leads After wires are connected to the terminal blocks they should be dressed through the cable clamp as shown in Figure 2 4 To do so unlatch the clip that holds the cable clamp together then route all wires flat against the lower half of the clamp Clamp the wires down then secure the clamp with the metal clip unlatched earlier Figure 2 4 Metal Clip Routing wires through cable clamp LH LUIH LJIH Lt H tjjH LILA Lj LO CH1 CH2 CH3 CH4 CH5OUTA CH4 dH7 CH CH y q T E Cable Clamp Note Plastic shield not shown Card Connections and Installation 2 9 Typical connecting schemes The following paragraphs discuss typical connections for the scanner card Voltage connections Figure 2 5 shows typical connections for voltage measurements Note that all channels are used in the 2 pole mode and that up to 10 voltage sources can be switched with this configuration This basic configuration can be used for the following types of measurements DCV ACV Frequency voltage only All channels 1 10 can be used with this configuration
43. gram alternate function SAVe Save alternate function RECall Recall alternate function The INT or EXT function parameter is one of the following VOLTage DC DC volts VOLTage AC AC volts TEMPerature Temperature FREQuency Frequency RESistance 2 wire resistance FRESistance 4 wire resistance RIUNctionX Reference junction X 1 to 5 NONE No function skips listed channel during scan ALTernate 1 Alternate function Notes 1 The ROUT SCAN LSEL command is coupled to the ROUT SCAN INT command When the ROUT SCAN INT command is executed the ROUT SCAN LSEL parameter will be set to INTernal 2 Upper case letters indicate short form of commands 3 Brackets indicate optional command and should not be used when sending commands to instrument 4 When sending SCPI commands be sure to include a space character between each command and parameter 3 8 Operation Model 2001 2002 front panel scanner controls and SCPI scanner commands The following paragraphs give an overview of the various Model 2001 2002 front panel controls and corresponding SCPI commands use to control the Model 2000 SCAN scanner card when installed in a Model 2001 2002 Multimeter CAUTION Damage may occur because break before make operation for channels 5 and 10 cannot be guaranteed when the high speed scanning modes of the Model 2001 2002 Multimeter are selected Closing channels Front panel Use the front panel CHAN key to close s
44. he Model 2000 SCAN can combine 2 and 4 pole switching in various combinations For example you might require 4 pole switching for only two resistors while the remaining resistors could be tested using conventional 2 pole switching Figure 3 3 shows a test configuration using mixed 2 pole and 4 pole switching Four pole switching is used only for device 1 connected to channels 1 and 6 and device 2 connected to channels 2 and 7 Six more resistors are tested using 2 pole switching Figure 3 3 Combining 2 pole and 4 pole switching Model 2001 2002 Input HI Input LO eoo Do 2000 o lolo I Sense HI Sense LO DMM Rear Panel Model2001 2002 shown in i 4 Pole j Connections Connections I I I I i l I I I I I I H I I ji l I I i i i i gt 2 Pole l I I I I I I i I I H I I I I I l l I DUT s 8 Measurement functions for each scanner channel are defined using the INTERNAL CHANS menu available by pressing CONFIG CHAN see Using the scanner with the buffer on page 3 13 Measurement functions for this test would be set up as follows Channels 1 and 2 Q4W Channels 3 4 5 and 8 10 Q2W Note that functions cannot be defined for channels 6 and 7 with this application because these channels are paired with channels 1
45. ir can be deposited on the insulator surface To avoid these problems never touch the connector insulating material In addition the scanner card should be used only in clean dry environments to avoid contamination If the connector insulators should become contaminated either by inadvertent touching or from air borne deposits they can be cleaned with a cotton swab dipped in clean methanol After thoroughly cleaning they should be allowed to dry for several hours in a low humidity environment before use or they can be dried more quickly using dry nitrogen 3 24 Operation 4 Service Information 4 2 Service Information WARNING The information in this section is intended only for qualified service personnel Some of the procedures may expose you to hazardous voltages that could result in personal injury or death Do not attempt to perform these procedures unless you are qualified to do so Introduction This section contains information necessary to service the Model 2000 SCAN scanner card and is arranged as follows Handling and cleaning precautions Discusses handling precautions and methods to clean the card should it become contaminated Performance verification Covers the procedures necessary to determine if the scanner card meets stated specifications Special handling of static sensitive devices Reviews precautions necessary when handling static sensitive devices Principles of operation Briefly d
46. iscusses circuit operation Troubleshooting Presents some troubleshooting tips for the Model 2000 SCAN including relay replacement precautions Handling and cleaning precautions Because of the high impedance areas on the Model 2000 SCAN care should be taken when handling or servicing the card to prevent possible contamination The following precautions should be observed when servicing the card Handling precautions Handle the card only by the edges and shields Donottouch any board surfaces or components not associated with the repair Donottouch areas adjacent to electrical contacts When servicing the card wear clean cotton gloves Do not store or operate the card in an environment where dust could settle on the circuit board Use dry nitrogen gas to clean dust off the board if necessary Service Information 4 3 Soldering precautions Should it become necessary to use solder on the circuit board observe the following precautions Use an OA based organic activated flux and take care not to spread the flux to other areas of the circuit board Remove the flux from the work areas when the repair has been completed Use pure water along with clean cotton swabs or a clean soft brush to re move the flux Once the flux has been removed swab only the repaired area with methanol then blow dry the board with dry nitrogen gas After cleaning the card should be allowed to dry in a 50 C low humidity
47. l and any pertinent addenda Repacking for shipment Should it become necessary to return the Model 2000 SCAN for repair carefully pack the unit in its original packing carton or the equivalent and include the following information e Advise as to the warranty status of the scanner card Write ATTENTION REPAIR DEPARTMENT on the shipping label Fill out and include the service form located at the back of this manual Card Connections and Installation 2 2 Card Connections and Installation Introduction WARNING The procedures in this section are intended only for qualified service personnel Do not perform these procedures unless you are qualified to do so Failure to recognize and observe normal safety precautions could result in personal injury or death This section includes information on making connections to the Model 2000 SCAN and on installing the card in a Model 2000 2001 2002 Multimeter This section is arranged as follows Handling precautions Explains precautions that must be followed to prevent contamination to the scanner card assembly Contamination could degrade the performance of the scanner card Connections Covers the basics for connecting external circuitry to the scanner card Typical connection schemes Provides some typical connection schemes for 2 pole and 4 pole operation Card installation and removal Summarizes the procedure to install the scanner card in a multimeter outlines sc
48. lay press CONFIG TEMP The instrument will display the following CONFIG TEMPERATURE SENSOR UNITS SPEED FILTER RESLN Select SENSOR then press ENTER The following will be displayed TEMP SENSOR TYPE RTD 4 WIRE RTD THERMOCOUPLE Select RTD or 4 WIRE RTD as appropriate for the sensor type you are using then press ENTER The instrument will display the following SET RTD TYPE PT385 PT3916 USER RTD Select the RTD type from among the displayed types then press ENTER Press EXIT to return to the CONFIG TEMPERATURE menu Select UNITS then press ENTER The unit will display the following selections SET TEMP UNITS DEG C DEG F K Choose the type of temperature units you desire to use F C or K then press ENTER Before exiting the temperature configuration menu select speed filter and resolution operating modes if desired Press EXIT to return to normal display Operation 3 15 Step 3 Configure channels 10 11 12 13 Press CONFIG CHAN The instrument will display the following CONFIGURE CHANNELS INTERNAL CHANS EXTERNAL INPUTS Select INTERNAL CHANS The Model 2001 will display the following SET INTERNAL CHANNELS 1 DCV 2 DCV 3 DCV 4zDCV 5zDCV Use the cursor and range keys to select channels and functions Set the function type to TMP for all channels connected to RTD probes Select none for channels without probes connected Press ENTER to return to normal display Step 4 Configure
49. ment make sure the line cord is connected to a properly grounded power receptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks before each use When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting 5 03 cables or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Always make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating information and as shown on the instrument or test fixture panels or switching card When fuses are used in a
50. minals of channel 1 Place the Model 617 in standby and enable zero check Repeat steps 9 through 12 for channels 2 through 10 Be sure that the channel under test is closed With the Model 617 voltage source in standby connect the electrometer to the HI terminals of scanner card channels 1 and 2 as shown in Figure 4 4 Banana to Banana Cable Ground Link Removed V Source HI Model 617 Source V and Measure V I Unterminated to Banana Cable Model 7025 Unterminated Triax Cable HI Red Ch T HI 9 971 1 annel 1 s Channel 2 4 x x HI oeTe To Channel 5 LO o o0 L oLO HI oLO Close channel 1 using the CHAN key On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to settle verify that the reading is gt 1GQ 10 Q This measurement represents the isolation resistance between the HI terminals of channels 1 and 2 Place the Model 617 in standby and enable zero check Repeat steps 14 through 18 to measure isolation resistance between the channel 1 HI terminal and channels 3 through 10 HI terminals Be sure that the electrometer is connected to the HI terminals of the two channels being tested and that channel 1 is closed Channel 6 i Channel 7 9 Channel 10 i LO l 4 Pole eum 2 Pole Model 2000 SCAN OUTA OUT B Repeat steps 14 through 19 for
51. n Power up detection The scanner card is detected only at power on If the card is plugged in after the power is turned on the card will not be recognized as being present by the multimeter CAUTION Plugging in the scanner card with power turned on may result in damage to both the Model 2000 SCAN and the multimeter If the card is not present at power on scanner bus commands or queries will generate a Missing hardware error and front panel operations pertaining to the scanner will inform you that no scanner is present Scanner option bus query OPT is an IEEE 488 2 common query which will allow you determine whether or not a scanner card is installed The response to this query indicates whether or not a scanner card is present as follows 0 Scanner not installed e 200X SCAN Scanner installed The Model 2000 does not distinguish among scanner cards Refer to Model 2000 2001 2002 manuals for more details on using the OPT query 3 4 Operation Model 2000 Multimeter front panel scanner controls and SCPI scanner commands The following paragraphs give an overview of the various Model 2000 Multimeter front panel controls and corresponding SCPI commands used with the Model 2000 SCAN Closing channels Front Panel Use the front panel CLOSE key to close specific channels as follows 1 From the normal display press the CLOSE key The instrument will display the following CLOSE CHAN 01 2 Use the g
52. n a 50 C environment before use Current measurements Even with the current shunts installed you cannot make direct current measurements with the scanner card Instead you must close the channel to be measured and measure the voltage across the shunt The current can then be calculated as follows Where I current being determined V voltage measured by multimeter R shunt resistance value Instead of manually calculating current set up a Model 2000 2001 2002 mX b math calculation function Here m 1 R and b 0 The multimeter will then display the actual current value Refer to the multimeter manuals for details on using math functions 2 14 Card Connections and Installation Current connections Figure 2 9 shows typical connections for measuring currents using the Model 2000 SCAN with current shunts installed As noted previously only channels 1 and 6 have current shunts installed and this configuration can be used to scan the following e DC current e AC current Figure 2 9 7 Current connections x CH 14 AC or DC Current T O CH 2 4 O I O CH 3 4 E O O CH4 O O CH 5 4 O To DMM OUT A Input e 5d CH 6 AC or DC A Current T O CH7 7 lo
53. nections require protection for high transient over voltages often associated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category I sources unless otherwise marked or described in the Manual Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock Tf the circuit is capable of operating at or above 1000 volts no conductive part of the circuit may be exposed Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sources NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective devices to limit fault current and voltage to the card Before operating an instru
54. ng or breaking connections to the scanner card make sure the DMM power is turned off and power is removed from all external circuitry e Do not connect signals that will exceed the maximum specifications of the scanner card If both the front panel terminals and the scanner card terminals are connected at the same time the maximum signal ratings of the front panel terminals are reduced to the maximum signal ratings of the scanner card As described in the International Electrotechnical Commission IEC Standard IEC 664 scanner cards are Installation Category I and must not be connected to mains 2 4 Card Connections and Installation Card configuration Figure 2 1 shows a simplified schematic diagram of the Model 2000 SCAN The scanner card has ten input channels and two outputs Channels 1 10 are all switched by relays 4 pole paired channels are as follows Channels 1 and 6 Channels 2 and 7 e Channels 3 and 8 Channels 4 and 9 Channels 5 and 10 Figure 2 1 User installed Model 2000 SCAN current shunt simplified schematic b HI oo TO Channel 1 I Loo o c Channel 2 4 andi SERI OUT A Channel 5 J LOO oO O LO To DMM input jacks bl OUT B O LO To DMM sense jacks User installed L8 ser installei AP dil current shunt ha oTo Channel 6 w Channel 7 9 HI O o T Channel 10 us IZ Card Connections and Installation 2 5 Card connectors Figure
55. ng the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety approvals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Products that consist of a circuit board with no case or chassis e g data acquisition board for installation into a computer should never require cleaning if handled accord ing to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing Table of Contents General Information InttOGUCHOD siii tale tinca 1 2 lorum 1 2 Warranty information ooconoccncnnoncnononnnonnnnnnnnnonncnn nono eene 1 2 Manual addenda soriire 1 3 Safety symbols and terms sene 1 3 Specifications eei eite Hee becas 1 3 Unpacking an
56. ntal conditions 4 3 Isolation tests 4 8 Path resistance tests 4 4 Recommended equipment 4 4 Scanner card connections 4 4 Principles of operation 4 11 Block diagram 4 11 Power on safeguard 4 12 Relay control 4 12 Switching circuits 4 12 Repacking for shipment 1 4 Replaceable Parts 5 1 RTD temperature measurements 3 14 Safety symbols and terms 1 3 Scanner card detection 3 3 Power up detection 3 3 Scanner option bus query 3 3 SCPI scanner commands 3 7 Service Information 4 1 Signal limitations 3 3 Relay input 3 3 Special handling of static sensitive devices 4 11 Specifications 1 3 A 1 Troubleshooting 4 13 access 4 13 equipment 4 13 procedure 4 14 Typical applications 3 16 Current measurements 3 19 Resistor testing 3 16 2 wire resistance tests 3 16 4 wire resistance tests 3 17 Combining 2 pole and 4 pole switching Models 2001 2002 3 18 Typical connecting schemes 2 9 U Current measurements 2 12 Board cleaning 2 13 Current connections 2 14 Unpacking and inspection 1 4 Handling precautions 1 4 Inspection for damage 1 4 Instruction manual 1 4 Shipment contents 1 4 Current measurements 2 13 Current shunt locations 2 12 Recommended current shunt values 2 12 Ww Resistance connections 2 10 oA E Warranty information 1 2 2 Pole connections 2 10 4 Pole connections 2 11 Voltage connections 2 9 Service Form Model No Serial No Date Name and Telephone No Company List all control settings describe pro
57. o fasteners then remove the Cover plate 2 Slide the card edges into the guide rails inside the multimeter solder side up for Model 2001 2002 component side up for Model 2000 3 With the ejector arms in the unlocked position carefully push the card all the way forward until the arms engage the ejector clips Push both arms inward to lock the card into the multimeter 4 After installation connect the output leads to the multimeter as discussed below Card Connections and Installation 2 17 Output connections to multimeter After installation connect the scanner card output leads to the multimeter rear panel jacks as follows WARNING _ Signals applied to the front inputs of the multimeter cannot exceed ratings of the scanner card as long as the scanner card output leads are connected to the multimeter rear panel input jacks For 2 pole operation connect OUT A HI red to INPUT HI and connect OUT A LO black to INPUT LO See Figure 2 11 Figure 2 11 Input HI 2 pole output connections Input LO Out A HI Red LO Black Note Card installation in a Model 2001 2002 is shown For installation in Model 2000 turn card over NOTE Be sure to select the rear inputs with the multimeter front panel INPUTS switch when using the scanner 2 18 Card Connections and Installation For 4 pole operation connect OUT A HI red to INPUT HI and connect OUT A LO black to INPUT LO Also connect OUT B HI red to SEN
58. oldering precautions esee 4 3 Performance verification ooconcnncnnonnnonconnnnncnnnnrncnn nro nonn non nnnnrnnonnos 4 3 Environmental conditions esee 4 3 Recommended equipment esee 4 4 Scanner card connections eee 4 4 Path resist nce tests mini tere tene aer gas cp 4 4 Contact potential tests esses 4 6 Isolda 4 8 Special handling of static sensitive devices 4 11 Principles Of operation sese 4 11 Block digtart area a e i 4 11 Relay control eerte iter ae EOE 4 12 Switching CI CUIIS 5 etie ocio pene Ie erae ena ve e io edi 4 12 Power on safeguard sese 4 12 Troubleshooting eiecit tete tege enhn 4 13 Troubleshooting equipment sene 4 13 Troubleshooting access eeeeeeeeeenen 4 13 Troubleshooting procedure esee 4 14 Replaceable Parts Ihisonifeito MP Dt 5 2 ucl iaa 5 2 Ordering information eese 5 2 Factory SO VICS M m 5 2 Component layout and schematic diagram 5 3 Specifications List of Illustrations 2 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 3 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 4 Figure
59. ora Channel 5 Lo 0 o 6 O LO O HI OUTB o LO bb 4 Pole f 2 Pole H Channel 6 LO Channel 7 9 H Channel 10 L Specifications subject to change without notice Index Card Connections and Installation 2 1 P Card installation and removal 2 15 Output connections to multimeter 2 17 Scanner Card Installation 2 16 Scanner card removal 2 18 Component layout and schematic diagram 5 3 Connections 2 3 Card configuration 2 4 Card connectors 2 5 Connection precautions 2 3 Dressing leads 2 8 Output connections 2 7 Wiring procedure 2 6 Factory service 5 2 R Features 1 2 General Information 1 1 Handling and cleaning precautions 4 2 Handling precautions 4 2 Soldering precautions 4 3 Handling precautions 2 2 Manual addenda 1 3 Measurement considerations 3 20 Electromagnetic interference EMI 3 21 Ground loops 3 22 Keeping connectors clean 3 23 Magnetic fields 3 21 T Path isolation 3 20 Model 2000 Multimeter front panel scanner controls and SCPI scanner commands 3 4 Closing channels 3 4 Configuring scan parameters 3 5 Opening channels 3 4 Selecting measurement function 3 5 Model 2001 2002 front panel scanner controls and SCPI scanner commands 3 8 Closing channels 3 8 Opening channels 3 9 Scanning channels 3 10 Using the scanner with the buffer 3 13 Operation 3 1 Ordering information 5 2 Parts list 5 2 Performance verification 4 3 Contact potential tests 4 6 Environme
60. ox H ro t SHI Channel 5 i OUT A LO o o aLO ea OUT B oLO 4 Pole ee 2 Pole HI o Channel 6 Channel 7 9 L 1 Channel 10 n LO o Model 2000 SCAN 4 8 Service Information Isolation tests These tests check the leakage resistance isolation between all HI and LO terminals and from HI and LO terminals to chassis ground In general the test is performed by applying a voltage 100V across the terminals and then measuring the leakage current The isolation resistance is then calculated as R V I In the following procedure the Model 617 functions as a voltage source and as an ammeter In the V I function the Model 617 internally calculates the resistance from the known voltage and current levels and displays the resistance value Perform the following steps to check isolation 1 Connect a 4 length of Teflon insulated 22AWG stranded wire to every HI and LO terminal on the scanner card both inputs and outputs Mark the free end of each wire so you can identify wires when the scanner card is installed With the power off install the scanner card in the multimeter Turn on the Model 2001 power Turn on the Model 617 and allow the unit to warm up for two hours for rated accuracy Select the Model 617 2pA range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure A WARNING The following steps use high voltage 100V Be sure to r
61. pecific channels as follows 1 From normal display press the CHAN key The instrument will display the following menu CHANNEL SELECTION CLOSE CHANNEL OPEN ALL CHANNELS 2 Select CLOSE CHANNEL then press ENTER The Model 2001 2002 will display the following prompt ENTER CHANNEL 00 1 10 3 Use the cursor and range keys to select the channel you wish to close 1 10 then press ENTER Any previously closed channel will open and the selected channel will close NOTE Once a channel is closed use the lt q or We key to manually scan through channels Also you can use the NEXT display to view three successive channels simultaneously Remote inter ace Use the ROUT CLOSE command to close the desired channel For example assume you wish to close channel 3 The following command would be used PRINT 1 output 16 rout close 3 Operation 3 9 Opening channels Front panel Use the front panel CHAN key to open any closed channels as follows 1 Press the CHAN key The instrument will display the following menu CHANNEL SELECTION CLOSE CHANNEL OPEN ALL CHANNELS 2 Select OPEN ALL CHANNELS then press ENTER The closed channel will open immediately Remote interface Use the ROUT OPEN command to open the closed channel For example the following command would be used to open channel 3 PRINT 1 output 16 rout open 3 You can also use ROUT OPEN ALL or ROUT OPEN ALL to open channels 3 10 Operation
62. plex one of ten 2 pole or one of five 4 pole channels into a Model 2000 2001 2002 Multimeter Warranty information Warranty information is located at thew front of this instruction manual Should your Model 2000 SCAN require warranty service contact the Keithley representative or authorized repair facility in your area for further information When returning the scanner card for repair be sure to fill out and include the service form at the back of this manual in order to provide the repair facility with the necessary information General Information 1 3 Manual addenda Any improvements or changes concerning the scanner card or manual will be explained in an addendum included with the card Addenda are provided in a page replacement format Simply replace the obsolete pages with the new pages Safety symbols and terms The following symbols and terms may be found on an instrument or used in this manual The A symbol on an instrument indicates that the user should refer to the operating instructions located in the instruction manual The A symbol on an instrument shows that high voltage may be present on the terminal s Use standard safety precautions to avoid personal contact with these voltages The WARNING heading used in this manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading used in this m
63. product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa O screw is present connect it to safety earth ground using the wire recommended in the user documentation The AN symbol on an instrument indicates that the user should refer to the operating instructions located in the manual The A symbol on an instrument shows that it can source or measure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety precautions to avoid personal contact with these voltages The a symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully 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 accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits includi
64. rawing number 2000 176 located at the end of Section 5 of this manual Block diagram Figure 4 6 shows a simplified block diagram of the Model 2000 SCAN Key elements include the relay drivers and relays as well as the power up reset circuit These various elements are discussed in the following paragraphs Figure 4 6 Block diagram To Clock Relay Multimeter a Data Drivers Relays User Connections F E Strobe U101 U103 Kiota Enable Power on Reset U104 4 12 Service Information Relay control Card relays are controlled by serial data transmitted via the relay DATA line A total of three bytes are shifted in serial fashion into latches located in the card relay driver ICs The serial data is clocked in by the CLOCK line As data overflows one register it is fed out the Q S line of the register down the chain Once all three bytes have shifted into the card the STROBE line is set high to latch the relay information into the Q outputs of the relay drivers and the appropriate relays are energized assuming the driver outputs are enabled as discussed below Note that a relay driver output goes low to energize the corresponding relay Switching circuits Relays K101 through K106 and K108 to K111 perform input switching while K107 configures the card for 2 pole or 4 pole operation Power on safeguard A power on safeguard circuit made up of U104 and associated components ens
65. rn path such as power line ground As shown in Figure 3 7 the resulting ground loop causes current to flow through the instrument LO signal leads and then back through power line ground This circulating current develops a small but undesirable voltage between the LO terminals of the two instruments This Signal Leads Instrument 2 Instrument 3 O I o O O gt Ground Loop xr Current y ic Line Ground Figure 3 8 loops Eliminating ground manual for all instrumentation in the test setup o Instrument 2 o o Power Line Ground Figure 3 8 shows how to connect several instruments together to eliminate this type of ground not normally a problem with instruments having isolated LO terminals However all Instrument 1 loop problem Here only one instrument is connected to power line ground Ground loops are Instrument 3 instruments in the test setup may not be de signed in this manner When in doubt consult the Operation 3 23 Keeping connectors clean As is the case with any high resistance device the integrity of connectors can be compromised if they are not handled properly If connector insulation becomes contaminated the insulation resistance will be substantially reduced affecting high impedance measurement paths Oils and salts from the skin can contaminate connector insulators reducing their resistance Also contaminants present in the a
66. scan and scan channels 1 From normal display press CONFIG SCAN The instrument will display the following SCAN OPERATION INTERNAL EXTERNAL Select INTERNAL then press ENTER Press SCAN then follow the prompts 3 16 Operation Typical applications Resistor testing Figure 3 1 2 wire resistance test connections The Model 2000 SCAN can be used to test up to 10 resistors using 2 wire measurements or up to five resistors using 4 wire measurements Such tests use the Model 2000 22 and O4 resistance functions 2 wire resistance tests Figure 3 1 shows a typical test setup for making 2 wire resistance measurements The Model 2000 SCAN card provides the switching function while the resistance measurements are made by a Model 2000 Multimeter Since only 2 pole switching is required for this application one Model 2000 SCAN card can be used to switch up to 10 resistors Measurement accuracy can be optimized by minimizing residual resistance make connecting wires as short as possible and limit the number of connectors to minimize path resistance Another technique is to short one of the scanner channel inputs close the shorted channel and then enable the multimeter REL feature to null out path resistance Leave REL enabled for the entire test 2000 SCAN ofo i HI LO 1 OutA 9 o1 i 10 DMM Rear Panel
67. sconnect any wires connected to the scanner card terminal blocks Install the scanner card in the multimeter 6 Connect the line cord and turn on the power to measure voltages see following paragraph eA 4 14 Service Information Troubleshooting procedure Table 4 3 summarizes scanner card troubleshooting steps Refer to the schematic diagram and component layout drawings at the end of Section 5 for component locations WARNING Lethal voltages are present within the Model 2000 Some of the procedures may expose you to hazardous voltages Observe standard safety precautions for dealing with live circuits Failure to do so could result in personal injury or death CAUTION Use care when removing relays from the PC board to avoid pulling traces away from the circuit board Before attempting to remove a relay use an appropriate de soldering tool such as a solder sucker to clear each mounting hole completely free of solder Each relay pin must be free to move in its mounting hole before removal Also make certain that no burrs are present on the ends of the relay pins NOTE To avoid contamination which could degrade card performance always handle the card only by the side edges and covers Do not touch edge connectors board surfaces or components on the card Also do not touch areas adjacent to electrical contacts on connectors Table 4 3 Troubleshooting procedure Step Item component Required condition Comments
68. t A and Y keys to select the channel you wish to close then press ENTER The number of the closed channel will be displayed on the front panel along with normal readings Selecting a different channel from the one presently closed will cause the closed channel to open and allow a settling time before closing the selected channel 3 The lt q and gt keys alone will also close the channels Press the and f keys until the channel annunciator you wish closed appears on the display Remote interface Use the ROUTe CLOSe command to close the desired channel For example if you wish to close channel 4 use the following command PRINT 1 output 16 route close 4 Use the ROUTe MULTiple CLOSe command to close multiple channel For example if you wish to close channels 1 3 and 5 use the following command PRINT 1 output 16 route multiple close 1 3 5 Note that opening channel 11 selects the 4 pole operating mode Opening channels Front Panel Use the front panel OPEN key to open all of the card channels Operation 3 5 Remote interface Use the ROUTe OPEN ALL command to open all of the channels The command is as follows PRINT 1 output 16 route open all Use the ROUTe MULTiple OPEN command to open specified channels For example if you wish to open channels 1 3 and 5 use the following command PRINT 1 output 16 route multiple open 1 3 5 Note that opening channel 11 selects the
69. the EMF contact potential generated by each relay contact pair HI and LO for each channel The tests use a sensitive digital voltmeter Model 182 to measure the contact potential Perform the following procedure to check contact potential of each channel 1 p nm Connect 1 22AWG copper jumper wires between the HI and LO terminals of each channel input see Figure 4 2 Connect the Model 182 to OUT A HI and LO using the low thermal cable see Figure 4 2 With the power off install the scanner card in the Model 2001 Multimeter Turn on the Model 2001 and the Model 182 Sensitive Digital Voltmeter Allow the Model 182 to warm up for two hours before measurement Select the 3mV range on the Model 182 Select the DCV function on the Model 2001 Using the CHAN key close channel 1 see Path resistance tests on page 4 4 for procedure Verify that the Model 182 reading is lt 1 V Repeat steps 7 and 8 for all 10 channels After completing all measurements turn off the Model 2001 power remove the scanner card and disconnect all jumpers and test leads Service Information 4 7 Figure 4 2 Connections for contact potential tests Model 1484 Low Thermal Cable Unterminated foofo ofo oda inn n nin n n o Connect bare copper jumpers between Model 182 HI and LO of each channel bas sa Channel 1 LO Channel 2 4 t
70. the LO terminal of the channel being tested and the other lead should be connected to chassis ground In addition channel 1 should be closed Service Information 4 11 Special handling of static sensitive devices CMOS and other high impedance devices are subject to possible static discharge damage because of the high impedance levels involved When handling such devices use the precautions listed below NOTE pa In order to prevent damage assume that all parts are static sensitive Such devices should be transported and handled only in containers specially designed to prevent or dissipate static build up Typically these devices will be received in anti static containers made of plastic or foam Keep these parts in their original containers until ready for installation or use Remove the devices from their protective containers only at a properly grounded workstation Also ground yourself with an appropriate wrist strap while working with these devices Handle the devices only by the body do not touch the pins or terminals Any printed circuit board into which the device is to be inserted must first be grounded to the bench or table Use only anti static type de soldering tools and grounded tip soldering irons Principles of operation The following paragraphs discuss the basic operating principles for the Model 2000 SCAN and can be used as an aid in troubleshooting the card The schematic drawing of the card is shown on d
71. timeter and connect the output leads from the scanner card to the rear panel HI and LO INPUT jacks see Figure 4 1 9 Close channel 1 as follows A From normal display press CHAN The instrument will display the following CHANNEL SELECTION CLOSE CHANNEL OPEN ALL CHANNELS B Select CLOSE CHANNEL then press ENTER The Model 2001 will display the following ENTER CHAN 01 1 10 C Using the range and cursor keys select channel 01 then press ENTER D Press EXIT to return to normal display 10 Note the resistance reading on the Model 2001 Verify that the reading is lt 2Q 11 Repeat steps 9 and 10 for channels 2 9 Verify that the path resistance for each channel is as follows channels 1 10 lt 2Q 12 After completing the tests turn off the Model 2001 power remove the scanner card and remove all jumper wires leave HI and LO shorted for each channel if you intend to perform contact potential tests Figure 4 1 Jumper HI and LO Connections for path of all 10 Channels resistance checks Input Input HI LO HI ri Channel 1 LO o OOJ Channel 2 4 at X ola NT e HII OUTA DMM Rear Panel Channel 5 ear Pane LO ALO Model 2001 2002 o HI shown UTB oLO a 2 Pole Channel 6 HI Channel 7 9 Channel 10 HI LO Model 2000 SCAN 4 6 Service Information Contact potential tests These tests check
72. ures that relays do not change state on power up and power down This circuit disables all relay actuation during power up and power down periods by holding the OE output enable lines high during these periods Service Information 4 13 Troubleshooting Troubleshooting equipment Table 4 2 summarizes recommended equipment for troubleshooting the Model 2000 SCAN Table 4 2 Recommended troubleshooting equipment Description Manufacturer and model Application Multimeter Keithley 2000 2001 DCV checks Oscilloscope TEK 2243 View logic waveforms Troubleshooting access In order to gain access to the scanner card circuit board to measure voltages under actual operating conditions perform the following steps 1 Turn off the Model 2000 power and disconnect the line cord and all other equipment If wires are connected to the scanner card remove the scanner card from the multimeter 3 Remove the Model 2000 cover as follows A Remove the handle by rotating it to align the arrows on the handle mounting ears Pull out and remove the handle B Remove the screws that secure the handle mounting ears then remove the ears C Remove the screws that attach the rear bezel to the case then remove the bezel D Remove the bottom screws that grounds the case to the chassis WARNING Be sure to install and tighten the grounding screws after replacing the cover E Remove the cover by pulling it off towards the rear 4 Di
73. used with all channels to scan e 4 wire resistance measurements 4 wire RTD temperature measurements Model 2001 and 2002 multimeters Figure 2 7 Typical connections cH1 7 t for 4 wire resistance El scanning BE 3 CH 24 l 7 cu3 t Resistors e Under Test e CH4 CH547 m o OUTA 7 o CH6 4 CH74 CH8 CH9 4 7 CH 1047 o OUT B 17 ait lo LO I HI To DMM Sense 7 To DMM I t HI o npu 2000 SCAN Card 2 12 Card Connections and Installation Current measurements Current shunts can be installed on the circuit board to allow indirect AC and DC current measurements to be made through channels 1 and 6 only The following paragraphs discuss installing current shunts and the basic methods used to determine currents CAUTION Board mounted current shunt resistors can be installed only for channels 1 and 6 A channel that has been modified with a current shunt resistor should not be used for voltage or resistance measurements Current shunt locations Figure 2 8 shows the locations for the user installable current shunts Location R145 is for channel and R14

Manual

Contents

Download Pdf Manuals

Related Search

Related Contents