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Many instruments incorporate internal filtering that may help reduce EMI effects. In some

cases, additional external filtering may be required. Keep in mind, however, that filtering may
have detrimental effects on the measurement.

Ground loops

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 return 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
voltage will be added to the source voltage, affecting the accuracy of the measurement.

Figure 3-8

shows how to connect several instruments together to eliminate this type of ground

loop problem. Here, only one instrument is connected to power line ground. Ground loops are
not normally a problem with instruments having isolated LO terminals. However, all
instruments in the test setup may not be de-signed in this manner. When in doubt, consult the
manual for all instrumentation in the test setup.

Instrument 1

Instrument 2

Instrument 3

Power Line Ground

Signal Leads

Ground Loop

Current

Figure 3-7

Power line ground
loops

Instrument 1

Instrument 2

Instrument 3

Power Line Ground

Figure 3-8

Eliminating ground
loops

3-22

Operation

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Содержание 2000-Scan

Страница 1: ...Model 2000 ScanScanner Card Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E ...

Страница 2: ...T 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 Instruments Inc...

Страница 3: ...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 ...

Страница 4: ...al are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 2000 SCAN 901 01 November 1994 Revision B Document Number 2000 SCAN 901 01 February 1995 Addendum B Document Number 2000 SCA 901 02 April 1995 Addendum B Document Number 2000 SCA 901 03 December 1995 Revision C Document Number 2000 SCAN 901 01 May ...

Страница 5: ...onnected to mains voltage or to voltage sources with high transient over voltages Measurement Category II connections 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 s...

Страница 6: ... these voltages The 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 Instr...

Страница 7: ...packing for shipment 1 4 2 Card Connections and Installation Introduction 2 2 Handling precautions 2 2 Connections 2 3 Connection precautions 2 3 Card configuration 2 4 Card connectors 2 5 Wiring procedure 2 6 Output connections 2 7 Dressing leads 2 8 Typical connecting schemes 2 9 Voltage connections 2 9 Resistance connections 2 10 Current measurements 2 12 Card installation and removal 2 15 Scan...

Страница 8: ...els 3 8 Opening channels 3 9 Scanning channels 3 10 Using the scanner with the buffer 3 13 RTD temperature measurements 3 14 Typical applications 3 16 Resistor testing 3 16 Current measurements 3 19 Measurement considerations 3 20 Path isolation 3 20 Magnetic fields 3 21 Electromagnetic interference EMI 3 21 Ground loops 3 22 Keeping connectors clean 3 23 4 Service Information Introduction 4 2 Han...

Страница 9: ...2 Switching circuits 4 12 Power on safeguard 4 12 Troubleshooting 4 13 Troubleshooting equipment 4 13 Troubleshooting access 4 13 Troubleshooting procedure 4 14 5 Replaceable Parts Introduction 5 2 Parts list 5 2 Ordering information 5 2 Factory service 5 2 Component layout and schematic diagram 5 3 A Specifications ...

Страница 10: ... 18 3 Operation Figure 3 1 2 wire resistance test connections 3 16 Figure 3 2 4 wire resistance test connections 3 17 Figure 3 3 Combining 2 pole and 4 pole switching Model 2001 2002 3 18 Figure 3 4 Connections for current measurements 3 19 Figure 3 5 Path isolation resistance 3 20 Figure 3 6 Voltage attenuation by path isolation resistance 3 21 Figure 3 7 Power line ground loops 3 22 Figure 3 8 E...

Страница 11: ...peration Table 3 1 Summary of SCPI scanner commands 3 7 4 Service Information Table 4 1 Recommended verification equipment 4 4 Table 4 2 Recommended troubleshooting equipment 4 13 Table 4 3 Troubleshooting procedure 4 14 ...

Страница 12: ......

Страница 13: ...1 General Information General Information ...

Страница 14: ...2001 Multimeter and Model 2002 Multimeter Key features include Ten channels of 2 pole relay input Channels configurable for 4 pole operation Multiplex 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 Ke...

Страница 15: ...tion manual The 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 i...

Страница 16: ...ent immediately Shipment contents The following items are included with every Model 2000 SCAN order Model 2000 SCAN Scanner Card Model 2000 SCAN Instruction Manual CA 109 test lead set for output connections two red two black 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 ...

Страница 17: ...2 CardConnections andInstallation CardConnec tionsandInstal lation ...

Страница 18: ...r 2 pole and 4 pole operation Card installation and removal Summarizes the procedure to install the scanner card in a multimeter outlines scanner 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 Su...

Страница 19: ...to the following safety precautions Before making or breaking connections to the scanner card make sure the DMM power is turned off and power is removed from all external circuitry 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 fr...

Страница 20: ... are as follows Channels 1 and 6 Channels 2 and 7 Channels 3 and 8 Channels 4 and 9 Channels 5 and 10 HI LO Channel 1 HI LO Channel 2 4 Channel 5 HI LO Channel 6 HI LO Channel 7 9 Channel 10 HI LO OUT A To DMM input jacks OUT B To DMM sense jacks HI LO 2 Pole 4 Pole User installed current shunt User installed current shunt Figure 2 1 Model 2000 SCAN simplified schematic 2 4 Card Connections and In...

Страница 21: ...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 CH 1 H L CH 2 H L CH 3 H L CH 4 H L CH 5 H L OUT A H L CH 6 H L CH 7 H L CH 8 H L CH 9 H L CH 10 H L OUT B H L Channels 1 5 OUT A Channels 6 10 OUT B Loc...

Страница 22: ...00 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 recommended for scanner card connections 3 Loosen the screw terminal then insert the wire into the access hole 4 While holding the wire in place tighten the con...

Страница 23: ... the scanner card only in the 2 pole mode it is not necessary to connect output leads to both OUTA 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 CH 1 H L CH 2 H L CH 3 H L CH 4 H L CH 5 H L OUT A H L CH 6 H L CH 7 H L CH 8 H L ...

Страница 24: ...her 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 CH 1 H L CH 2 H L CH 3 H L CH 4 H L CH 5 H L OUT A H L CH 6 H L CH 7 H L CH 8 H L CH 9 H L CH 10 H L OUT B H L Cable Clamp Note Plastic shield not shown Metal Clip Figure 2 4 Routing wires through cable clamp 2 8 Card Connections and Installation ...

Страница 25: ...figuration 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 H L H L H L H L H L H L H L H L H L H L H L H L CH 1 CH 2 CH 3 CH 4 CH 5 OUT A CH 6 CH 7 CH 8 CH 9 CH 10 OUT B V HI LO V HI LO V HI LO V HI LO V HI LO To DMM Input HI LO V HI LO V HI LO V HI LO V HI LO V HI LO 2000 SCAN Card Vo...

Страница 26: ...uration can be used to test up to ten DUTs H L H H L H L H L H L H L H L H L H L H L H L CH 1 CH 2 CH 3 CH 4 CH 5 OUT A CH 6 CH 7 CH 8 CH 9 CH 10 OUT B To DMM Input 2000 SCAN Card Resistors Under Test Resistors Under Test HI LO L Figure 2 6 Typical connections for 2 wire resistance scanning 2 10 Card Connections and Installation ...

Страница 27: ... measurements 4 wire RTD temperature measurements Model 2001 and 2002 multimeters H L H L H L H L H L H L H L H L H L H L H L H L CH 1 CH 2 CH 3 CH 4 CH 5 OUT A CH 6 CH 7 CH 8 CH 9 CH 10 OUT B To DMM Sense 2000 SCAN Card Resistors Under Test To DMM Input HI LO HI LO Figure 2 7 Typical connections for4 wireresistance scanning Card Connections and Installation 2 11 ...

Страница 28: ... 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 1kΩ resistors should be optimum for many applications A 1kΩ 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 ...

Страница 29: ...dry for several hours in 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 resistan...

Страница 30: ...ts installed and this configuration can be used to scan the following DC current AC current H L H L H L H L H L H L H L H L H L H L H L H L CH 1 CH 2 CH 3 CH 4 CH 5 OUT A CH 6 CH 7 CH 8 CH 9 CH 10 OUT B 2000 SCAN Card AC or DC Current A AC or DC Current A Note Current shunts must be installed for channels 1 and 6 To DMM Input Figure 2 9 Current connections 2 14 Card Connections and Installation ...

Страница 31: ...alified 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 Card C...

Страница 32: ...n 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 ...

Страница 33: ...onnected 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 NOTE Be sure to select the rear inputs with the multimeter front panel INPUTS switch when using the scanner Input HI Out A HI Red Input LO Out A LO Black Note Card installation in a Model 2001 2002 is shown For installation in Model 2000 tur...

Страница 34: ...rds Make sure all power is removed and any stored energy in external circuitry is discharged 1 Unlock the card by pulling the latches outward 2 Carefully slide the card out of the multimeter 3 If the multimeter is to be operated without the scanner card installed install the cover plate over the OPTION SLOT Input HI Out A HI Red Input LO Out A LO Black Out B HI Red Sense HI Sense LO Out B LO Black...

Страница 35: ...3 Operation Operation ...

Страница 36: ...s 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 informa...

Страница 37: ...e 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 q...

Страница 38: ...ng 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 and keys alone will also close the channels Press the and 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 ch...

Страница 39: ...DC volts PERIOD period ACV AC volts TEMP simulated temperature Ω2W 2 wire ohms CONT continuity Ω4W 4 wire ohms channels 1 5 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 in...

Страница 40: ...ed 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 CH...

Страница 41: ...ls Return all closed channels Open channels Open any closed channels Multiple channel commands Close specified channels 1 thru 11 Query closed channels Open specified channels Scanning commands Program internal scan list Program channel functions Program external scan list Select scan list Sense subsystem Select measurement function Program alternate function Save alternate function Recall alterna...

Страница 42: ...m 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 ...

Страница 43: ...L 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 Operation 3 9 ...

Страница 44: ...he following menu SET INTERNAL CHANS 1 DCV 2 DCV 3 DCV 4 DCV 5 DCV 3 Using the cursor keys select the desired channel press the right cursor key to display channels 6 through 10 4 Using the range keys select the desired measurement function DCV ACV Ω2W Ω4W FRQ TMP ALT None 5 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 6 After...

Страница 45: ...ER 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 ...

Страница 46: ...nels a single command would suffice PRINT 1 output 16 rout scan int func 1 2 3 volt dc Step2 Programinternalscanlistandstartscan 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 programmed as follows PRINT 1 output 16 rout scan int 1 2 3 Scanning will begin immediately when this comman...

Страница 47: ... 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 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 s...

Страница 48: ...ypeandunits 1 From normal display press CONFIG TEMP The instrument will display the following CONFIG TEMPERATURE SENSOR UNITS SPEED FILTER RESLN 2 Select SENSOR then press ENTER The following will be displayed TEMP SENSOR TYPE RTD 4 WIRE RTD THERMOCOUPLE 3 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 TY...

Страница 49: ...se 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 13 Press ENTER to return to normal display Step4 Configurescanandscanchannels 1 From normal display press CONFIG SCAN The instrument will display the following SCAN OPERATION INTERNAL EXTERNAL 2 Select INTERNAL then pr...

Страница 50: ...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 RE...

Страница 51: ...fects 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 1 DUTs 5 R A Test Configuration B Simplified Equivalent Circuit 5 6 10 1 5 HI LO Sense HI Sense LO HI Sense HI LO Sense LO 2001 2...

Страница 52: ...ching 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 Ω4W Channels 3 4 5 and 8 10 Ω2W Note that functions cannot be defined for channels 6 and 7 with this application because these channels are ...

Страница 53: ...or 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 DUTs 2 V A Test Configuration B...

Страница 54: ...ath 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 dev...

Страница 55: ...or 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 denoted by the CE mark However it is still poss...

Страница 56: ...r line ground This circulating current develops a small but undesirable voltage between the LO terminals of the two instruments This voltage will be added to the source voltage affecting the accuracy of the measurement Figure 3 8 shows how to connect several instruments together to eliminate this type of ground loop problem Here only one instrument is connected to power line ground Ground loops ar...

Страница 57: ...taminants present in the air 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...

Страница 58: ...3 24 Operation Section 3 Page 24 Tuesday July 8 2003 2 30 PM ...

Страница 59: ...4 Service Information Service Information ...

Страница 60: ...ons necessary when handling static sensitive devices Principles of operation Briefly discusses 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 co...

Страница 61: ... 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...

Страница 62: ...fore proceeding 5 Select the Ω2W function and the 20Ω range on the Model 2001 6 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 ...

Страница 63: ...display 10 Note the resistance reading on the Model 2001 Verify that the reading is 2Ω 11 Repeat steps 9 and 10 for channels 2 9 Verify that the path resistance for each channel is as follows channels 1 10 2Ω 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 poten...

Страница 64: ...ow thermal cable see Figure 4 2 3 With the power off install the scanner card in the Model 2001 Multimeter 4 Turn on the Model 2001 and the Model 182 Sensitive Digital Voltmeter Allow the Model 182 to warm up for two hours before measurement 5 Select the 3mV range on the Model 182 6 Select the DCV function on the Model 2001 7 Using the CHAN key close channel 1 see Path resistance tests on page 4 4...

Страница 65: ... 10 HI LO OUT A OUT B HI LO 2 Pole 4 Pole Connect bare copper jumpers between HI and LO of each channel Model 2000 SCAN Model 1484 Low Thermal Cable Unterminated KEITHLEY 182 SENSITIVE DIGITAL VOLTMETER Model 182 Figure 4 2 Connections for contact potential tests Service Information 4 7 ...

Страница 66: ...Model 2001 power 4 Turn on the Model 617 and allow the unit to warm up for two hours for rated accuracy 5 Select the Model 617 2pA range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure WARNING The following steps use high voltage 100V Be sure to remove power from the circuit before making connection changes 6 Set the Model 617 voltage source...

Страница 67: ...eading is 1GΩ 109Ω This measurement represents the isolation resistance between the HI terminals of channels 1 and 2 18 Place the Model 617 in standby and enable zero check 19 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 tes...

Страница 68: ...ther lead should be connected to chassis ground 27 Repeat steps 21 through 26 for channels 1 through 10 LO terminals One electrometer lead should be connected to 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 HI LO Channel 1 HI LO Channel 2 4 Channel 5 HI LO Channel 6 HI LO Channel 7 9 Channel 10 HI LO OUT...

Страница 69: ...g with these devices 3 Handle the devices only by the body do not touch the pins or terminals 4 Any printed circuit board into which the device is to be inserted must first be grounded to the bench or table 5 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 a...

Страница 70: ... 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 U1...

Страница 71: ...t 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 Disconnect ...

Страница 72: ...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 con...

Страница 73: ...5 Replaceable Parts Replaceable Parts ...

Страница 74: ...or addresses When ordering parts be sure to include the following information Card model number 2000 SCAN Card serial number Part description Circuit description if applicable Keithley part number Factory service If the card is to be returned to Keithley Instruments for repair perform the following Call the Instruments Division Repair Department at 1 800 552 1115 for a Return Material Authorizatio...

Страница 75: ...d Scanner Bottom Shield Scanner Top Sleeved Banana Plug Test Lead Strain Relief Bottom Strain Relief Top Strip Polyurethane CAP 1UF 20 50V CERAMIC CAP 100UF 20 25V ALUM ELEC CONN FEMALE 12 PIN RELAY MINATURE DPDT TQ2E L2 5V CONN FEMALE DUAL 16 PIN RES 1K 5 1 4W COMPOSITION OR FILM RES 4 7K 5 1 4W COMPOSITION OR FILM IC 8 BIT SERIAL IN LATCH DRIVER 5841A IC SUPPLY VOLTAGE SUPERVISOR TL7705AC FA 237...

Страница 76: ...5 4 Replaceable Parts ...

Страница 77: ......

Страница 78: ......

Страница 79: ...A Specifications Specifica tions ...

Страница 80: ...e 1W at end of contact life Contact Potential 500nV typical per contact 1µV max 500nV typical per contact pair 1µV max Connector Type Screw terminal 22 AWG wire size Isolation Between Any Two Terminals 109W 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...

Страница 81: ...ont 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 O Operation 3 1 Ordering information 5 2 P Parts list 5 2 Performance verification 4 3 Contact potential tests 4 6 Environmental conditions 4 3 Isolation tests 4 8 Path resistance tests 4 4 Recommended equipment 4 4 Scanner card connection...

Страница 82: ...2 13 Current shunt locations 2 12 Recommended current shunt values 2 12 Resistance connections 2 10 2 Pole connections 2 10 4 Pole connections 2 11 Voltage connections 2 9 U Unpacking and inspection 1 4 Handling precautions 1 4 Inspection for damage 1 4 Instruction manual 1 4 Shipment contents 1 4 W Warranty information 1 2 ...

Страница 83: ...le to zero Unstable Overload Will not read applied input Calibration only Certificate of calibration required 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 _______...

Страница 84: ......

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Страница 86: ...1 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 Langford Town Bangalore 560 025 080 212 80 27 Fax 080 212 80 05 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North To...

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