Manual - Test Equipment Depot
Contents
1. 7710 Module ES peat snk gating gt i i 2 120V a al Ch 1 configured to measure TC temperature Ch 2 configured to measure 5V regulator output Card handling precautions The solid state relays used on the 7710 card are static sensitive devices Therefore they can be damaged by electrostatic discharge ESD CAUTION To prevent damage from ESD only handle the module by the card edges DO NOT touch the backplane connector terminals When working with the quick disconnect terminal blocks DO NOT touch any circuit board traces or other components If working in a high static environment use a grounded wrist strap when wiring the module 4 Touching a circuit board trace may also contaminate it with body oils that may degrade the isolation Q resistance between circuit paths adversely affecting measurements It is good practice tohandlea circuit board only by its edges Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Card connections Screw terminals on the switching module are provided for connection to DUT and external circuitry The Model 7710 uses quick disconnect terminal blocks A terminal block can be wired outside the module and then plugged back in These terminal blocks are rated for 25 connect disconnects WARNING The information in this section is intended for qualified service personnel Do not attempt to perform this procedure unless qualified to do so Figur2. BEE EEE ETE LEE EEE EE EEE EP EEE EEE TELE PALE PR OLA AEE EE EDIE EE ELA EEE OE This event occurs when host computer is finished sending data 2 ORE OR Be BP a a RB RT a RP ee Be a ie a RR PE a RR Ra a oe a a Private Sub Winsock1 SendComplete DataSent True End Sub REE ERE EE ELE DEE EE EOE PEED PEL EDEL ETE LE CELE ERE LE EEE TERED EEE PEELS EEF SendKI sends data to the 2701 over the ethernet connection 2 PO OR RE a EOE EEE POR RE Pe Fe PE OR RR PO Re PO ee ER PORE Pe Pe a Oe ee Sub SendKI Cmd As String Send command to mainframe and wait for data sent event DataSent False Winsock1 SendData Cmd Chrs 13 Do DoEvents Loop Until DataSent End Sub PEELE ER EERE EERE ELE EEE EEE EEL EEE PELE TEE ERED Close the winsocket if it is still opened FREE EL PEE ELE ELE EEE DEL EERE LAE ELEL ET RE ED OEE PROT Private Sub CloseWinsocket If Winsock1 State lt gt sckClosed Then Winsock1 Close End Sub CELE EE EEE EEE CDE ELE EVE OEE EEL EEE LE EEE EERE EAL E CEL LOT EOL DEE EEE terta This function is called when the run button is pressed on the Form ERR APE LEEPER EE EL EEE EEL EE EEL EEE EEE LEE EEE IRE LEE LE IRE LEEPER ELE EE EPL ETOP S Private Sub RunTestButton_Click If a scan is not already running begin a new scan Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido If Not TestRunning Then Call S
3. Digital Thermometer 18 to 23 C 0 1 C Keithley 7797 Calibration Extender Board Extender board connections The Model 7710 being calibrated should be connected to the 7797 Calibration Extender Board and the extender board should then be installed in scanner Slot 1 Note that the module being calibrated will be external to the Model 27xx to avoid card heating during calibration Model 7710 calibration NOTE Before calibrating the Model 7710 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possible to minimize card heating that could affect calibration accuracy Allow the Model 27xx to warm up for at least two hours Front panel Model 7710 calibration 1 Connect the Model 7710 to the Model 7797 Calibration Extender Board see Extender board connec tions above With the power off install the Model 7710 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Accurately measure and record the cold temperature of the Model 7710 card surface at the center of the card with a digital thermometer Press in and hold the Model 27xx OPEN key while turning on the power Press SHIFT then TEST and then display TEST CALIB with the up or down range key Press ENTER select RUN and then e
4. 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 8225 1886 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 01 64 53 20 20 Fax 01 60 11 77 26 Landsberger Strasse 65 82110 Germering 089 84 93 07 40 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 e Fax 82 2 574 7838 Postbus 559 4200 AN Gorinchem e 0183 63 53 33 Fax 0183 63 08 21 c o Regus Business Centre Frosundaviks All 15 4tr e 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 Copyright 2003 Keithley Instruments Inc Printed in the U S A 5 03 Test Equi
5. For the 7710 card insertion loss is specified for a 502 AC signal source routed through the mod ule to a 50Q load Signal power loss occurs as the signal is routed through the signal paths of the module to the load Insertion loss is expressed as dB magnitudes at specified frequencies The specifications for inser tion loss are provided in the Specifications at the end of this User s Guide See INSERTION LOSS in the Specifications As an example assume the following specifications for insertion loss lt 1dB 500kHz 1dB insertion loss is approximately 20 loss of signal power lt 3dB 2MHz 3dB insertion loss is approximately 50 loss of signal power As signal frequency increases power loss increases NOTE The insertion loss values used in the above example may not be the actual insertion loss specifications of the Model 7710 The actual insertion loss specifications are provided in the Specifications at the end of this User s Guide Crosstalk An AC signal can be induced into adjacent channel paths on the 7710 card In general crosstalk increases as frequency increases For the 7710 card crosstalk is specified for an AC signal routed through the module to a 5 load Crosstalk is expressed as a dB magnitude at a specified frequency The specification for crosstalk is provided in the Specifications at the end of this User s Guide See CROSSTALK in the Specifications As an example assume the
6. SYST LSYN OFF Disables line synchronization TRIG DEL 0 Sets trigger delay to 0 seconds FORM DATA ASCII Formats data as an ASCII string N A for 2701 FORM ELEM READ Returns each reading with units only CALC3 OUTP OFF Disables limit outputs CALC3 LIM1 STAT OFF Disables limit 1 test DISP ENAB OFF Turns off display When finished with the scan the display can be turned back on with the following commana DISP ENAB ON Turns on display Fast scan using 7710 module with Model 2701 mainframe The following Visual Basic VB Version 6 program demonstrates using the Model 7710 card and Model 2701 mainframe to achieve fast scanning It makes use of WinSocket control to communicate with the Model 7701 mainframe This User s Guide is provided as a PDF file on the product informa tion CD ROM From Acrobat Reader the program code can be copied and pasted into Visual Basic Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do s do L PEE TEA EEE RD PEPPER ERD EEE ES PED EEE PER PER PEST 7710 DCV FAST SCAN EXAMPLE FOR THE 2701 MODULE This program is an example of configuring a simple DCV scan on the 7710 with a 2701 mainframe This program acquires readings at a rate of 500 sec 1 Note that a Winsocket control in Visual Basic is being used to communicate with the 2701 EER DEL E EEL PLD EEL ER EL EEL EE OR PEER EE OED EOL EE ER
7. 12 COSSA K aren a aie een aut edie eee page 12 Additional errors for 27xXx switch SYStOMS 00 00 00 eeceeceeeeeeeee cette settee eee teaeeeeeetaeeeeeteas page 12 Heat sink temperature measurements 0 0 0 eeeeeeeeeeeeeeeeeeeeeeeeeseneeeeeeeteeeaeeeeteeeeaeees page 13 Card handling preCautions cccceccceeeeeeeeeceeeeeeeceeeeeeeeeeeaaeeeeeeenaeeeeeeeenaeeeeeeeaas page 13 Card COMMECUONS erais i aaa Ei E AEE EEE EA ET EE E page 14 Wiring procedUre ccd sctadertecediveedele rpeetea i Hall diet sl advie in E ANTAA TE EATE Ea aE page 15 Typical connections saz ses oecco cach hace shade ateeced cis tveideagh lucensastatevace sunivebdaausesseuensvanebecaestaees page 17 GOMMECUOM lO riss a E T aa page 19 CABANON eei e E ete aaeeaivedab nee page 21 Specifications sasora aaen naaa aa a AEAEE Eai end of User s Guide PA 847 Rev B 8 03 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Operating instructions CAUTION Before installing or removing a Model 77xx plug in module make sure the Model 27xx power is turned off and disconnected from line power Failure to comply may result in incorrect operation and loss of Model 77xx EPROM data Switching card operation is covered in the Model 27xx User s Manual The Model 7710 operates the same as the Model 7700 switching card with the following differences e The Model 7710 has no amps channel The Model 7700 has two amps channels e The Model
8. 7710 card cannot be used if the heat sink is being floated at a 3 dangerous voltage level gt 60V An example of such a test is shown in Figure 3 9 In Figure 3 the heat sink is floating at 120V which is the line voltage being input to a 5V regula tor The intention is to use channel 1 to measure the temperature of the heat sink and use chan nel 2 to measure the 5V output of the regulator For optimum heat transfer the thermocouple TC is placed in direct contact with the heat sink This inadvertently connects the floating 120V potential to the 7710 card The result is 115V between channel 1 and channel 2 HI and 120V between channel 1 and chassis These levels exceed the 60V limit of the card creating a shock hazard and possibly causing damage to the card WARNING The test in Figure 3 demonstrates how a dangerous voltage can unintention ally be applied to the 7710 card Keep in mind that in any test where floating voltages gt 60V are present you must be careful not to apply the floating volt age to the card Figure 3 Example of an unsafe measurement practice WARNING DONOT use the 7710 card to perform this type of test It exceeds the 60V limit creating a shock hazard and could cause damage to the card Excessive voltages The voltage differential between Ch 1 and Ch 2 Hl is 115V The voltage differential between Ch 1 and Ch 2 LO chassis is 120V paiscieuieiewen cess ce eee a ceeeee podineeeceeeseeee wee H Test Circuit Thermocouple
9. 7710 uses solid state opto coupled FET relays The Model 7700 uses latching electromechanical relays Solid state relays provide longer relay life and are up to six times faster than the electromechanical types used in other switching modules WARNING The system s maximum voltage including other switch modules and front panel terminals is limited to 60V peak to peak AC or DC between any terminal and chassis or any two terminals when the 7710 is installed Exceeding these levels creates a shock hazard and could cause damage to the card Complete specifications are located at the end of this User s Guide WARNING When a Model 7710 module is inserted into a Model 27xx it is connected to the front and rear inputs as well as the other cards in the system through the instrument backplane To prevent damaging the 7710 module or creating a shock hazard the entire test system and all of its inputs should be de rated to 60V DC 42V rms Card configuration Figure 1 shows a simplified schematic diagram of the Model 7710 module As shown the Model 7710 has channels that are grouped into two banks of ten channels twenty channels total Backplane isolation is provided for each bank Each bank includes separate cold junction reference points The first bank contains channels 1 through 10 while the second bank contains channels 11 through 20 Each channel of the 20 channel multiplexer card is wired with separate inputs for HI LO providing fully isol
10. PELE EET EEE PAD EB TEE EP EOE TELE EEE PTE OLE ED ED EAP ERED Const ScanList 101 120 Dim TestRunning As Boolean Dim DataReceived As Boolean Dim DataSent As Boolean Dim Data As String FERAL AM LORE EAE EE EEE ERA EERE EE DE EE OLE EEE EEE EE AEE EEL LEE EE LE ECE LEAL EEDA LS A Visual Basic function call when a Form program window is opened CREEL ESR AES SER LEE ELSE OeE LE SOE LEE RAE ALES LESLIE HERE OKT ORAS OF Private Sub Form_Load TestRunning False End Sub CEB TREE PRE DIE PEPE EE TREE DIO ERE TEIE BEE ELE EE EEE ED CBE BEE CATE ER These two functions exit the program and closes the winsocket Private Sub ExitButton_Click Unload Me End Sub Private Sub Form_Unload Cancel As Integer Cancel MsgBox Exit 20 Exit Verify If Cancel vbYes Then Cancel 0 CloseWinsocket End If End Sub FEEL LEE OE EEE IEE EEE EE EEE ETE EEE LEAL LEP LL TETEE TETEL DEEL EOE EL EE ELE EEE ER LEE EEL EECEL EEO This function opens the Winsocket for communication with the 2701 ethernet mainframe CED BPE EP EE EEE PED EE TORE EAE EE ELIE EDIE BLP IORI PDE TEM RE EAT ERA EDA IEE EEE EEE DEED EOD ITE IE Function ConnectTo2701 As Integer Dim TimeO As Single Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido If txtAddress Text Then ConnectTo2701 False Exit Function End If With Winsock1 Protocol sckTCPProtocol
11. RemoteHost txtAddress Text RemotePort 1394 Connect End With Check for proper connection TimeO Timer While Timer TimeO lt 10 And Winsock1 State lt gt sckConnected DoEvents Wend If Winsock1l State lt gt sckConnected Then Could not connect to 2701 MsgBox Cannot connect to LastAddress 48 IP Connect Error ConnectTo2701 False Exit Function End If Connection to 2701 found ConnectTo2701 True End Function FEE ELE EERE LEE EE DEE EITM AEE DEE EEE ER ER ETON EL Event to capture data from mainframe POE ETD ERE LIE PEE EM TE EB MERE IB ERB POE ET RM Private Sub Winsockl1 DataArrival ByVal bytesTotal As Long Winsock1 GetData Data vbString 50000 Chr 10 Or If Right Data 1 Chr 10 Then Data Left Data Len Data 1 DataReceived True End If End Sub POEL EP EEE ERE EEL EE EOLA OEE EET EEE EPR OTE EEE EAE OE EE EEE ED EE EE EOE EAA P EOE PT QueryKI retrieves data from the 2701 over the ethernet connection POET EPP E EE RL PEE EE EDEL EEE PEE EERE LD EET PEED DEEP PEE ET EEE PEPER PE EEE IED Bot Function QueryKI As String Read Ethernet data Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido DataReceived False Do Remain in loop until mainframe is finished sending data DoEvents Loop Until DataReceived QueryKI Data Return reading End Function
12. following specification for crosstalk lt 40dB 500kHz __ 40dB indicates that crosstalk into adjacent channels is 0 01 of the AC signal As signal frequency increases crosstalk increases NOTE The crosstalk values used in the above example may not be the actual crosstalk specification of the Model 7710 The actual crosstalk specification is provided in the Specifications at the end of this User s Guide Additional errors for 27xx switch systems Additional 27xx measurement errors and typical system scanning speeds are provided after the first page of the Specifications on page 23 These measurement errors are to be added on to the specifications of the Model 27xx mainframe being used in the switch system e Notes 1 2 and 3 and tables for DC CHARACTERISTICS pertain to additional errors for high ohms resistance measurements voltage measurements and temperature mea surements e The two tables for SYSTEM SPEEDS provide speed data for scanning For the various scan functions the tables list the fundamental reading rate setting in PLCs and typical speed in readings per second into and out of memory Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido 13 Heat sink temperature measurements Measuring the temperature of a heat sink is a typical test for a system that has temperature mea surement capability However the
13. main input power dis connect device must be provided in close proximity to the equip ment 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 cables or jump ers 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 com mon 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 equip ment may be impaired Do not exceed the maximum signal levels of the instruments and ac cessories as defined in the specifications and operating informa tion and as shown on the instrument or test fixture panels or switching card When fuses are used in a 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 ap
14. plied to the device under test Safe operation requires the use of a lid interlock 5 03 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The A symbol on an instrument indicates that the user should re fer to the operating instructions located in the manual The AN symbol on an instrument shows that it can source or mea sure 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 i 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 infor mation 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 including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable national safety appro
15. 1 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do s do L Figure 7 Wire dressing Cable Tie Typical connections The following examples show typical wiring connections for the following types of measurements e Thermocouple connections see Figure 8 e Q 2 wire and thermistor connections see Figure 9 e Q 4 wire and RTD connections see Figure 10 Voltage connections DC or AC see Figure 11 17 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com soido soido soido 18 Figure 8 Thermocouple connections Channel 1 Channels 2 19 s e HI Channel 20 LO Thermocouple Figure 9 Q 2 wire and thermistor connections Channel 1 Resistor or Thermistor HI Channel 20 LO Channels 2 19 t e Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do s do 19 Figure 10 Q 4 wire and RTD connections Resistor or Chaani 4 Wire RTD LO Channels 2 9 HI Resistor or Channel 10 4 Wire RTD LO HI Channel 11 LO HI Channel 20 Figure 11 Voltage connections DC or AC DC Voltage Channel 1 LO Channels 2 19 HI Channel 20 Connection log Make a copy of Table 2 and the WARNING and affix them to the cover of the Model 7710 Use this to record connection information and channel descr
16. CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 Use the following procedure to wire the Model 7710 card Make all connections using the correct wire size up to 20 AWG Also make sure to add supplementary insulation around the harness for voltages above 42V peak see Figure 7 Make sure all power is discharged from the Model 7710 card Remove the card s top cover to gain access to the screw terminals see Figure 4 If desired pull the appropriate quick disconnect terminal block off the card Using a small flat blade screwdriver loosen terminal screws and install wires as desired refer to Figure 6 Figure 7 shows connections to channels 1 and 2 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com soido soido soido 16 Figure 6 Proper procedure to remove terminal blocks Step 1 Place flat head screwdriver under connector and gently push up to loosen it Step 2 Pull connector directly up with needle nose pliers CAUTION DO NOT rock connector from side to side Damage o the pins could result Plug the terminal block back into the card Route wire along wire path and secure with cable ties as shown Fill in a copy of the connection log Table 2 on page 18 and affix it to the module cover Close and lock cover ONO NOTE For maximum system performance all measurement cables should be less than 3 meters Test Equipment Depot 800 517 843
17. Hi esT RLEAD3 Rout RcHiLo o VAW Ch1 Lo j RcH11Lo i Ch11 Lo f Input Lo Sense Lo RLEAD4 Assumptions Virtually no current flows in the high impedance sense circuit due to the high impedance of the voltmeter Vm Therefore the voltage drops across Channel 11 and test leads 1 and 4 are negligible and can be ignored The voltage drops across Channel 1 Hi RCH1Hi and test lead 2 RLEAD2 are not measured by the voltmeter Vm Vm where Vm is the voltage measured by the 2750 ITEST ITEST is constant current sourced by the 2750 to the DUT Rout Vm Vsui Vsto VsHi ltest x Rout RLeaD3s RcHiLo Vsto Itest x RLEAD3s RcHiLo VsHi Vsto Itest x Rout Rueaps RcHiLo RLeans Rcdito Itest x Rout Vu Voltage measurements As previously explained path resistance can adversely affect Low ohms measurements see page 10 Series path resistance can also cause loading problems for DC voltage measurements on the 100V 10V and 10mV ranges when the 10M Q input divider is enabled High signal path resistance can also adversely affect AC voltage measurements on the 100V range above 1kHz Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do soido L 12 Insertion loss Insertion loss is AC signal power lost between the input and the output In general as frequency increases insertion loss increases
18. K Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 7710 20 Channel High Speed Long Life Differential Multiplexer w Automatic CJC Specifications GENERAL 20 CHANNELS 20 channels of 2 pole relay input All channels configurable to 4 pole RELAY TYPE Solid State Opto Coupled FET ACTUATION TIME lt 0 5mS 100mA load FIRMWARE Specified for Model 2700 Rev BOS Model 2750 Rev A04 and Model 2701 Rev A01 CAPABILITIES CHANNELS 1 20 Multiplex one of 20 2 pole or one of 10 4 pole signals into DMM INPUTS MAXIMUM SIGNAL LEVEL 60V DC or 42V rms between channel 1 20 HI and channel LO or between any channel HI or LO to any other channel HI or LO 100mA switched 6W 4 2VA maximum COMMON MODE VOLTAGE 300V DC or 300V rms 425V peak for AC waveforms between any terminal and chassis SAFETY Conforms to European Union Directive 73 23 EEC EN61010 1 CAT I EMC Conforms with European Union Directive 89 336 EEC EN61326 1 CONTACT LIFE gt 10 operations at cold switching or max signal level guaranteed by design CONTACT RESISTANCE lt 10Q per channel or lt 5Q per conductor Refer to the Model 7710 User s Guide for measurement considerations when used in a Model 2750 on the 19 or 10Q ranges CONTACT POTENTIAL lt 3uV per pair OFFSET CURRENT lt InA 23 C 45 C for 0V lt 5nA 23 C 5 C for 60V additional 0 13nA per 1 C above 28 C CONNECTOR TY
19. O oo o e o LO PisshGasiesccseatensate Channel 23 2 Pole Closed h To Model 4 Pole Open Channel 22 27xx PE E see Notes see Note Backplane Cold junction Backplane Ref x3 f isolation HI oof o o HI Channel 11 ante LO pi o 0 LO 1 1 J Channels 12 19 Channels 21 22 and 23 in this schematic refer to the designations used for control and not actual available channels Channels 21 and 22 can be individually controlled using multiple channel operation Ree hope oS ROUT MULT commands if the module is not to be connected to the internal DMM For more information see Section 2 of the H Card Sense LO Model 27xx User s Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com soido soido soido Fast scanning Fast scanning is achieved by using the 7710 module which has high speed solid state FET relays with the Model 2701 mainframe With mainframe speed settings optimized for DCV or ohms mea surements the Model 2701 can scan approximately twice as fast as the Models 2700 and 2750 To achieve the fastest scan possible use the following Model 27xx mainframe settings for the scan VOLT AVER STAT OFF Disables filtering VOLT DIG 4 Sets display resolution to 4 5 digits VOLT NPLC X Sets reading rate where X 0 01 2700 and 2750 X 0 002 2701 SYST AZER STAT OFF Disables auto zero
20. PE 3 5mm Removable Screw Terminals 20 AWG wire size ISOLATION BETWEEN ANY TWO TERMINALS gt 10 Q 23 C gt 8010 Q 50 C lt 100pF ISOLATION BETWEEN ANY TERMINAL AND EARTH gt 10 Q lt 100pF CROSSTALK CH CH 500kHz 50Q Load lt 40dB INSERTION LOSS 50Q Source 50Q Load lt 1dB below 500kHz lt 3dB below 2MHz ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified for 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 45kg 1 Ib ALTITUDE lt 2km CARD SOURCE CHANNEL 1 Ref x3 LO Cold Junction CHANNEL 10 16 l Cold Junction eT HI o o Ref x3 LO o o I l l l l l HI o CHANNEL 20 l Loo Na ia ae a ee a iol a ee eg a ee a Se al i Ne eet HI CARD SENSE g CHANNEL 21 o o LO To Mainframe CHANNEL 23 Backplane 2 Pole closed 4 Pole opened HI DLO CHANNEL 22 HW 11 07 02 Rev A Page of 1 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 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 KEITHLEY Keithley Instruments Inc Sales Offices BELGIUM CHINA FINLAND FRANCE GERMANY GREAT BRITAIN INDIA ITALY JAPAN KOREA NETHERLANDS SWEDEN TAIWAN
21. Test Equipment Depot 1 800 517 8431 vs sunsets ses aac Model 7710 Multiplexer Card User s Guide PA 847 Rev B 8 03 A GR Bee MEAS U Ree ONFIDENCE 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Nema Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some in struments and accessories would normally be used with non haz ardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recog nize shock hazards and are familiar with the safety precautions re quired 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 If the product is used in a manner not specified the protection pro vided by the product may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equipment is operated within its specifications and operating limits and for en suring that operators are adequately trained Operators use the product for its intended function They must be traine
22. ated inputs Connections to DMM functions are provided through the card backplane connector Channels 21 22 and 23 are configured automatically by the Model 27xx when using system chan nel operation However by using multiple channel operation refer to Section 2 of the Model 27xx User s Manual they can be manually configured For example assume a 7710 module is installed in slot 1 of the mainframe and an external source is connected to Card Source input To connect the source to channel 11 only multiple channel operation must be used ROUT OPEN ALL Open all channels ROUT MULT CLOS 111 123 Close channels 11 and 23 For the above command sequence the Digital Multimeter DMM of the Model 27xx will be electrically isolated from the test circuit Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido When using system channel operation for 4 wire measurements including 4 wire ohms RTD temperature Ratio and Channel Average the channels are paired as follows CH1 and CH11 CH6 and CH16 CH2 and CH12 CH7 and CH17 CH3 and CH13 CH8 and CH18 CH4 and CH14 CH9 and CH19 CH5 and CH15 CH10 and CH20 Figure 1 Simplified schematic of Model 7710 Card Source H Cold junction Ref x3 T Channel 1 oe Channel 21 I d see Note Channels 2 9 i s Backplane isolation H o oT o 0 HI Channel 10 Input L
23. canDCV End If End Sub PEE PREP EE ED EEE OEE EE FRE LE EEE TE OD EEE FEO PE POE EE EEE EP EEE EEE EEE PIES Data is formatted to show one reading per line in reading window ee a a eee eee ee a a Private Sub Format Readings Resp As String Dim Out_str As String Dim Ch As String Dim i As Long i Len Resp Out_str dy Sed While i lt Len Resp Ch Mid Resp i 1 If Ch Then Ch vbCrLf End If Out_str Out_str Ch i i 1 Wend Text1 Text Out_str End Sub LOE LEP EE LEE EL EEL ELE EEL EE REPEL EL ERE LIED EEE LED E BED This is the main function for the 7710 test program Private Sub ScanDCV Dim NumReadings As Integer Dim Resp As String Dim Cmd As String If Not ConnectTo2701 Then Open connection to 2701 Exit Sub End If TestRunning True Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido NumReadings 1024 Resp Spaces 80 Cmd Spaces 80 Configure the instrument for scanning DCV 1 SendKI RST SendKI FORM DATA ASCII SendKI FORM ELEM READ SendKI SAMP COUN CStr NumReadings SendKI FUNC VOLT DC ScanList SendKI VOLT RANG 100 ScanList SendKI VOLT AVER STAT OFF ScanList SendKI VOLT DIG 4 ScanList SendKI VOLT NPLC 0 002 ScanList SendKI CALC3 OUTP OFF Sen
24. d in electrical safety procedures and proper use of the instru ment 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 de scribed 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 ser vice 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 sig nals are Measurement Category I and must not be directly connect ed 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 other wise marked or described in the Manual Exercise extreme caution when a shock hazard is present Letha
25. dKI SYST LSYN OFF SendKI DISP ENAB OFF SendKI SYST AZER STAT OFF SendKI CALC3 LIM1 STAT OFF ScanList SendKI TRIG DEL 0 SendKI TRAC CLE SendKI ROUT SCAN ScanList SendKI ROUT SCAN LSEL INT SendKI OPC Resp QueryKI SendKI INIT SendKI OPC Resp QueryKI SendKI ROUT SCAN LSEL NONE OPC Resp QueryKI SendKI TRACE DATA Resp QueryKI Format_Readings Resp SendKI DISP ENAB ON CloseWinsocket TestRunning False End Sub Take 1024 readings Put instrument in known state Format data as an ASCII string Return the reading with units only Take 1024 readings Set function to DCV Set Range to 100V Read to 4 significant digits Set NPLC to 0 002 Turn off limit test Turn off line sync Turn off display Turn off auto zero Turn off limits Set trigger delay to 0 seconds Clear reading buffer Set scan list Initiate scan Determines if mainframe is ready Initiate scan and store in buffer Wait for scan to complete Stop scan Get readings from buffer Turn display back on Disconnect connection to mainframe Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do soido 10 Operating considerations Low ohms measurements For resistances in the normal range gt 10 the 2 wire method 2 is typically used for ohms measurement
26. e 4 shows how to access the screw terminals on the Model 7710 Channel designations for the screw terminals are contained in Figure 5 WARNING Do not exceed the maximum specifications for the Model 7710 card Refer to the end of this User s Guide for specifications Figure 4 Screw terminal access 14 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do s do 15 Wiring procedure WARNING The information in this section is intended for qualified service personnel only Do not attempt to perform this procedure unless qualified to do so PQ NS CH5 CH6 HL HL HL cI P HA Qua cis b A LNA GAG ODDODDDDDDOOD LHLHLH 5 LHLHLH CHI CH2 CH3 CH4 CH TY 3 ry CHIT CH12 CH13 CH14 CH15 LHLHLHLHLH DDODDDDDDDD T rf ALLA cH Hp Gui dural chis L Hk AL Model 7710 screw terminal channel designations CH7 CH8 CH9 CHI10 HL HL Ha H9f cfo H H Uf H 0000000000 LHLHLALHLH CH6 CH7 CH8 CH9 CH10 CH16 CH17 CH18 CH19 CH20 ILHLHLHLH 000000000 TLAYLVAY q cA CH7 HE Sur aot H L H HL HL HL HL HL HL H
27. iptions as needed Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com AC Voltage lt AA a s do s do soido 20 WARNING The system s maximum voltage including other switch modules and front panel terminals is limited to 60V peak to peak AC or DC between any terminal and chassis or any two terminals when the 7710 is installed Table 2 Connection log Model 7710 Channel Color Description Card Source Card Sense CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 i E aE E Oe ee ee Oe ee ee De ee re ee ee E a ee Se oal Ee S E aaee S E l Ea ee e a e E a E Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com s do s do s do Calibration 21 The following procedures calibrate the temperature sensors on the Model 7710 plug in cards WARNING The information in this section is intended only for qualified service person nel Do not attempt these procedures unless you are qualified to do so Recommended test equipment In order to calibrate the Model 7710 you will need equipment summarized in Table 3 Table 3 Recommended equipment for Model 7710 calibration
28. l 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 pre vented access and or insulated from every connection point In some cases connections must be exposed to potential human con tact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock If 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 con necting sources to switching cards install protective devices to lim it fault current and voltage to the card Before operating an instrument make sure the line cord is connect ed 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
29. nter the appropriate calibration code default 0027xx With NEW CODE displayed use the up or down range key to display N and then press ENTER Using the up or down range key select CARD at the CAL RUN prompt and then press ENTER Set the display value to the cold calibration temperature C you measured in Step 3 then press ENTER to complete Model 7710 calibration Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 22 Remote Model 7710 calibration 1 Connect the Model 7710 to the 7797 Calibration Extender Board see Extender board connections 2 With the power off install the Model 7710 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temperature of the Model 7710 card surface at the center of the card 4 Press in and hold the Model 27xx OPEN key while turning on the power 5 Enable calibration by sending the CODE command For example the default command is CAL PROT CODE KI0027xx 6 Initiate calibration by sending the following command CAL PROT CARD1 INIT 7 Calibrate the Model 7710 with the following command CAL PROT CARD1 STEPO lt temp gt Here lt temp gt is the cold calibration temperature C measured in Step 3 8 Send the following commands to save calibration and lock out calibration CAL PROT CARD1 SAVE CAL PROT CARD1 LOC
30. one set of test leads R gap2 and RLeaps while the voltage Vm across the Device Under Test DUT is mea sured through a second set of leads Ry Ean and Reang called the sense leads With this configuration the resistance of the DUT is calculated as follows Rout Vm best where kesr is the sourced test current and Vy is the measured voltage As shown in Figure 2 the measured voltage Vp is the difference between V gy and Vg o The equations at the bottom of Figure 2 show how test lead resistance and channel resistance is can celled out of the measurement process Maximum test lead resistance Model 2750 s do s do Table 1 ists the maximum test lead resistance RL gap plus the resistance of the DUT R pyr Note that a larger test lead resistance can be tolerated with a smaller Rpuyr as shown in the following example Example If Rout is 32 on the 10Q range using the 94 4 wire function then the maximum test lead resis tance Reap can be 40 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com soido Table 1 Maximum test lead resistance Model 2750 s do Q2 Q4 Q4 Dry Circuit Range RLEAaD Rput READ Rput READ Rput 10 NA NA 0Q 1 20 Overflow Overflow 10Q 0Q 20 0Q 79 3Q 120 Figure 2 Low ohms measurements using 4 wire method Sense Hi _Rueap Ch11 Hi RcuiHi RLeap2 Input Hi o ANN Itest Ch1
31. pment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com
32. s For low ohms amp 100Q the signal path resistance in series with the DUT could be high enough to adversely affect the measurement Therefore the 4 wire method 24 should be used for low ohms measurements The following discussion explains the limitations of the 2 wire method and the advantages of the 4 wire method 2 wire method Resistance measurements in the normal range gt 100Q are generally made using the 2 wire method Q2 function The test current is forced through the test leads and the resistance being measured Rs The meter then measures the voltage across the resistance value accordingly The main problem with the 2 wire method as applied to low resistance measurements is the test lead resistance R_Eap and the channel resistance Roy The sum of these resistances typically lies in the range of 1 5 to 2 5Q Therefore it is very difficult to obtain accurate 2 wire ohms mea surements below 100 Q Due to this limitation the 4 wire method should be used for resistance measurements lt 100 Q This method is explained as follows 4 wire method The 4 wire Kelvin connection method using the 94 function as shown is Figure 2 is generally preferred for low ohms measurements The 4 wire method cancels the effects of channel and test lead resistance These measurements can be made using the Model 2750 Digital Multimeter With this configura tion the test current ItEst is forced through the test resistance Rpyrt through
33. vals 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 se lected 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 according to in structions If the board becomes contaminated and operation is af fected the board should be returned to the factory for proper cleaning servicing Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 www keithley com Introduction NOTE Model 7710 Multiplexer Card User s Guide The Model 7710 will operate properly when installed in one of the following Model 27xx instruments Model 2700 Equipped with B05 or later firm
34. ware Model 2701 Equipped with AQ1 or later firmware Model 2750 Equipped with A04 or later firmware The Model 7710 is a 20 channel differential multiplexer card with the following features Fast actuating long life solid state relays DC and AC voltage measurement 2 wire or 4 wire measurements automatically pairs relays for four wire measurements n 10 Temperature applications RTD thermistor thermocouple Built in cold junction reference for TC temperature Plug in screw terminal connections WARNING Before operating the Model 27xx with an accessory card verify that the card is properly installed and the mounting screws are tightly fastened If the mount ing screws are not properly connected an electrical shock hazard may be present Topics Operating INStIrUCUONS 3 22 3 a2itecisipiecudnigccel adh qeeeehaatploa he vbneedias deere aa eas page 2 Card COMPQUPATION sense page 2 Fast SCANNING oo eeeeceeeceece scence eee ceeeeeeeeeeeeeeaeeeseeeaaeeeeseeaaaeeeeeeeaaeeeeeeeeaeeeeseeiaaeeeeeeeaees page 4 Fast scan using 7710 module with Model 2701 mainframe n s page 4 Operating CONSIAEratiONS ec eeeeeeeeeeee eee eeeeee eee eeeeaeeeeeeeeaaeeeeeeeaaeeeeeeeaeeeeeeeaaas page 10 LOW ONMS measurements 000 0 cece eee eeeeeee eee eeee cette teeeeeeeeteaeeeeeeseceeeeeeeseeaeeeeeseenaees page 10 Voltage measurements earns anena Aaina eid ita page 11 INSCMION IOSS 5 eked siettters aelven AE eel abl ee eee page
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