Keithley 2000-Scan Instruction Manual
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Keithley 2000-Scan Instruction Manual

Keithley 2000-Scan Instruction Manual

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Model 2000-Scan
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  • Page 1 Model 2000-Scan Scanner 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...
  • Page 2 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 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.

  • Page 3: Instruction Manual

    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...
  • Page 4 Revision D (Document Number 2000-SCAN-901-01) ........... April 1999 Revision E (Document Number 2000-SCAN-901-01) ............. 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.
  • Page 5 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.
  • Page 6 (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.

  • Page 7: Table Of Contents

    Table of Contents General Information Introduction ................Features ..................Warranty information ..............Manual addenda ................. Safety symbols and terms ............Specifications ................Unpacking and inspection ............Inspection for damage ............Handling precautions ............Shipment contents ............... Instruction manual .............. Repacking for shipment ............. Card Connections and Installation Introduction ................
  • Page 8 Operation Introduction ................Signal limitations ................ Relay input signal limitations ..........Scanner card detection ..............Power-up detection .............. Scanner option bus query ............ Model 2000 Multimeter front panel scanner controls and SCPI scanner commands ............Closing channels ..............Opening channels ..............Selecting measurement function .........
  • Page 9 Special handling of static-sensitive devices ......4-11 Principles of operation ............. 4-11 Block diagram ..............4-11 Relay control ..............4-12 Switching circuits .............. 4-12 Power-on safeguard ............4-12 Troubleshooting ............... 4-13 Troubleshooting equipment ..........4-13 Troubleshooting access ............. 4-13 Troubleshooting procedure ..........4-14 Replaceable Parts Introduction ................
  • Page 10 List of Illustrations Card Connections and Installation Figure 2-1 Model 2000-SCAN simplified schematic ......Figure 2-2 Card connectors ..............Figure 2-3 Output connections ..............Figure 2-4 Routing wires through cable clamp ........Figure 2-5 Connections for voltage scanning .......... Figure 2-6 Typical connections for 2-wire resistance scanning ....
  • Page 11 List of Tables Operation Table 3-1 Summary of SCPI scanner commands ........Service Information Table 4-1 Recommended verification equipment ........Table 4-2 Recommended troubleshooting equipment ......4-13 Table 4-3 Troubleshooting procedure ..........4-14...
  • Page 13 General Information General Information...

  • Page 14: General Information

    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.

  • Page 15: Manual Addenda

    The CAUTION heading used in this manual 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.

  • Page 16: Unpacking And Inspection

    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.

  • Page 17: Card Connections And Installation

    Card Connec- tions and Instal- lation Card Connections and Installation...

  • Page 18: Introduction

    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 —...

  • Page 19: Connections

    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: •...

  • Page 20: Card Configuration

    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: •...

  • Page 21: Card Connectors

    Card Connections and Installation Card connectors Figure 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.

  • Page 22: Wiring Procedure

    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. Open the plastic shield to gain access to the connectors.

  • Page 23: Output Connections

    Card Connections and Installation 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.

  • Page 24: Dressing Leads

    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.

  • Page 25: Typical Connecting Schemes

    All channels (1-10) can be used with this configuration. Figure 2-5 Connections for voltage CH 1 scanning CH 2 CH 3 CH 4 CH 5 To DMM OUT A Voltages Input Under Test CH 6 CH 7 CH 8 CH 9 CH 10 OUT B 2000-SCAN Card...

  • Page 26: Resistance Connections

    Typical connections CH 1 for 2-wire resistance scanning CH 2 Resistors CH 3 Under Test CH 4 CH 5 To DMM OUT A Input CH 6 CH 7 Resistors CH 8 Under Test CH 9 CH 10 OUT B 2000-SCAN Card...

  • Page 27: Figure 2-7 Typical Connections For 4-Wire Resistance Scanning

    Typical connections CH 1 for 4-wire resistance scanning CH 2 Resistors CH 3 Under Test CH 4 CH 5 OUT A CH 6 CH 7 CH 8 CH 9 CH 10 OUT B To DMM Sense To DMM Input 2000-SCAN Card...

  • Page 28: Current Measurements

    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.

  • Page 29: Board Cleaning

    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.

  • Page 30: Figure 2-9 Current Connections

    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: •...

  • Page 31: Card Installation And Removal

    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.

  • Page 32: Scanner Card Installation

    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.

  • Page 33: Output Connections To Multimeter

    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.

  • Page 34: Scanner Card Removal

    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 SENSE HI, and connect OUT B LO (black) to SENSE LO. See Figure 2-12.

  • Page 35: Operation

    Operation Operation...

  • Page 36: Introduction

    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.

  • Page 37: Signal Limitations

    Operation 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).

  • Page 38: Model 2000 Multimeter Front Panel Scanner Controls And Scpi Scanner Commands

    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: From the normal display, press the CLOSE key.

  • Page 39: Selecting Measurement Function

    Operation 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;...
  • Page 40 Operation The instrument will then display the following message: TIMER? OFF Use the key to select the ON option if desired, then press ENTER. Select the scan time when prompted, then press ENTER: 00H:00M:01.000S The unit will then display the following message: RDG CNT: 0010 , ▲, and ▼...

  • Page 41: Scpi Scanner Commands

    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...

  • Page 42: Model 2001/2002 Front Panel Scanner Controls And Scpi Scanner Commands

    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...

  • Page 43: Opening Channels

    Operation Opening channels Front panel Use the front panel CHAN key to open any closed channels as follows: Press the CHAN key. The instrument will display the following menu: CHANNEL SELECTION CLOSE-CHANNEL OPEN-ALL-CHANNELS Select OPEN-ALL-CHANNELS, then press ENTER. The closed channel will open immediately.

  • Page 44: Scanning Channels

    3-10 Operation 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...
  • Page 45 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.
  • Page 46 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;...

  • Page 47: Using The Scanner With The Buffer

    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 Press CONFIG-CHAN.

  • Page 48: Rtd Temperature Measurements

    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.
  • Page 49 Operation 3-15 Step 3: Configure channels 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 4=DCV 5=DCV Use the cursor and range keys to select channels and functions. Set the function type to TMP for all channels connected to RTD probes.

  • Page 50: Typical Applications

    Operation Typical applications Resistor testing 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 Ω2 and Ω4 resistance functions. 2-wire resistance tests Figure 3-1 shows a typical test setup for making 2-wire resistance measurements.

  • Page 51: Figure 3-2 4-Wire Resistance Test Connections

    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 2000-SCAN 4-wire resistance test connections Out A...

  • Page 52: Figure 3-3 Combining 2-Pole And 4-Pole Switching (Model 2001/2002)

    Operation Combining 2-pole and 4-pole switching (Models 2001/2002) The 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.

  • Page 53: Current Measurements

    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...

  • Page 54: Measurement Considerations

    3-20 Operation Measurement considerations Many measurements made with the Model 2000-SCAN are subject to various effects that can 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.

  • Page 55: Magnetic Fields

    Operation 3-21 Figure 3-6 Voltage attenuation by path isolation resistance PATH PATH PATH 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.

  • Page 56: Ground Loops

    3-22 Operation 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.

  • Page 57: Keeping Connectors Clean

    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.
  • Page 58 3-24 Operation...

  • Page 59: Service Information

    Service Information Service Information...

  • Page 60: Introduction

    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.

  • Page 61: Soldering Precautions

    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.

  • Page 62: Table

    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 Path resistance tests Perform the following steps to verify that the path resistance of each channel is with specified values.

  • Page 63: Figure 4-1 Connections For Path Resistance Checks

    Jumper HI and LO of all 10 Channels Connections for path Input Input resistance checks Channel 1 Channel 2-4 OUT A DMM Rear Panel Channel 5 (Model 2001/2002 shown) OUT B 4-Pole 2-Pole Channel 6 Channel 7-9 Channel 10 Model 2000-SCAN...

  • Page 64: Contact Potential Tests

    Service Information Contact potential tests These tests check 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. Connect 1”...

  • Page 65: Figure 4-2 Connections For Contact Potential Tests

    KEITHLEY 182 SENSITIVE DIGITAL VOLTMETER Connect bare copper jumpers between Model 182 HI and LO of each channel Channel 1 Channel 2-4 Channel 5 OUT A OUT B 4-Pole 2-Pole Channel 6 Channel 7-9 Channel 10 Model 2000-SCAN...

  • Page 66: Isolation Tests

    Removed INPUT (Red) Channel 1 V-Source LO V-Source HI Model 617 Channel 2-4 Source V and OUT A Channel 5 Measure V/I Unterminated to Banana Cable OUT B 4-Pole 2-Pole Channel 6 Channel 7-9 Channel 10 Model 2000-SCAN...

  • Page 67: Figure 4-4 Connections For Channel-To-Channel Isolation Tests

    Channel 6 Channel 7-9 Channel 10 Model 2000-SCAN 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 >1GΩ...

  • Page 68: Figure 4-5 Connections For Hi And Lo Terminal To Chassis Ground Isolation Tests

    2-Pole Channel 6 Channel 7-9 Channel 10 Model 2000-SCAN Program the Model 2000 to close channel 1. On the Model 617, disable zero check, and press OPERATE to source +100V. Ω). After allowing the reading on the Model 617 to settle, verify that it is >1GΩ (10 Put the electrometer in standby, and enable zero check.

  • Page 69: Special Handling Of Static-Sensitive Devices

    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...

  • Page 70: Relay Control

    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.

  • Page 71: Troubleshooting

    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: Turn off the Model 2000 power, and disconnect the line cord and all other equipment.

  • Page 72: Troubleshooting Procedure

    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.

  • Page 73: Replaceable Parts

    Replaceable Parts Replaceable Parts...

  • Page 74: Introduction

    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 Authorization (RMA) number.

  • Page 75: Component Layout And Schematic Diagram

    Replaceable Parts 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 Card Ejector...
  • Page 76 Replaceable Parts...

  • Page 79: Specifications

    Specifica- tions Specifications...
  • Page 80 Specifications GENERAL 10 Channels: 10 channels of 2-pole relay input. All channels configurable to 4-pole. Relay Type : Latching electro mechanical. Actuation Time: <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).
  • Page 81 Index Operation Ordering information Card Connections and Installation Card installation and removal 2-15 Parts list Output connections to multimeter 2-17 Performance verification Scanner Card Installation 2-16 Contact potential tests Scanner card removal 2-18 Environmental conditions Component layout and schematic diagram Isolation tests Connections Path resistance tests...
  • Page 82 Typical connecting schemes Current measurements 2-12 Unpacking and inspection Board cleaning 2-13 Handling precautions Current connections 2-14 Inspection for damage Current measurements 2-13 Instruction manual Current shunt locations 2-12 Shipment contents Recommended current shunt values 2-12 Resistance connections 2-10 Warranty information 2-Pole connections 2-10 4-Pole connections...
  • Page 83 Service Form Model No. ___________________________ Serial No. _____________ Date __________ Name and Telephone No. ________________________________________________________ Company ______________________________________________________________________ List all control settings, describe problem and check boxes that apply to problem. _________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ ❑ Intermittent ❑ Analog output follows display ❑...
  • Page 86 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 Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 1-888-KEITHLEY (534-8453) •...

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