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Keithley 2000-SCAN User Manual

Scanner card for use with the dmm6500
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Download this manual See also: Instruction Manual
Model 2000-SCAN
Scanner Card for use with the DMM6500
User's Manual
2000-SCAN-900-01 Rev. A / April 2018
*P2000-SCAN-900-01A*
2000-SCAN-900-01A
tek.com/keithley

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Summary of Contents for Keithley 2000-SCAN

  • Page 1 Model 2000-SCAN Scanner Card for use with the DMM6500 User’s Manual 2000-SCAN-900-01 Rev. A / April 2018 *P2000-SCAN-900-01A* 2000-SCAN-900-01A...
  • Page 2 Cleveland, Ohio, U.S.A. All rights reserved. Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part, without the prior written approval of Keithley Instruments, LLC, is strictly prohibited. These are the original instructions in English. ®...

  • Page 3: Table Of Contents

    Table of contents General Information ....................1-1 Introduction .......................... 1-1 Features ..........................1-1 Unpacking and inspection ....................1-1 Inspecting for damage ....................... 1-1 Handling precautions ........................ 1-2 Factory service ........................1-2 Card connections and installation ................2-1 Introduction .......................... 2-1 Installation handling precautions ..................
  • Page 4 Table of contents Model 2000-SCAN Scanner Card User's Manual Path isolation ........................... 3-17 Magnetic fields ........................3-18 Electromagnetic interference (EMI) ..................3-18 Ground loops ........................... 3-19 Keeping connectors clean ....................... 3-20...
  • Page 5 Keithley products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient overvoltages.
  • Page 6 (note that selected parts should be purchased only through Keithley to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement component, call a Keithley office for information.

  • Page 7: General Information

    DMM6500 6½ Digit Graphical Sampling Multimeter. The 2000-SCAN provides 10 channels of 2-pole relay switching. The channels can also be configured for 4-pole operation. If you are using this scanner card with the 2700, 2701, or 2750, please see the 2000-SCAN Scanner Card Instruction Manual. Features Features of the scanner card include: •...

  • Page 8: Handling Precautions

    After removing the card from its anti-static bag, inspect it for any obvious signs of physical damage. Report any such damage to the shipping agent immediately. Factory service To return the scanner card to Keithley Instruments for repair: • Call the Repair Department at 1-800-833-9200 or send an email to RMAREQUEST@tektronix.com for a Return Material Authorization (RMA) number.

  • Page 9: Card Connections And Installation

    Card installation and removal ..........2-10 Introduction This section includes information on making connections to the 2000-SCAN Scanner Card and installing the scanner card in a DMM6500. The information in this topic is intended only for qualified service personnel. Some of the procedures may expose you to hazardous voltages that could result in personal injury or death.

  • Page 10: Connections

    Card configurations The following figure shows a simplified diagram of the 2000-SCAN. The scanner card has 10 input channels and two outputs. Channels 1 to 10 are all switched by the relays. 4-pole paired channels are as follows: •...
  • Page 11 Model 2000-SCAN Scanner Card User's Manual Section 2: Card connections and installation Figure 1: Simplified schematic 2000-SCAN-900-01 Rev. A / April 2018...

  • Page 12: Card Connectors

    Section 2: Card connections and installation Model 2000-SCAN Scanner Card User's Manual Card connectors The following figure shows the input and output connectors for the card. Card connectors include: • CH 1 to 10 (channels 1 to 10): HI and LO input terminals provided for each of the 10 channels on the card.

  • Page 13: Output Connections

    Model 2000-SCAN Scanner Card User's Manual Section 2: Card connections and installation Output connections When making output connections from your 2000-SCAN to a DMM6500, use the supplied test leads for scanner output connections. To make output connections to your DMM6500: 1.

  • Page 14: Dressing Leads

    Model 2000-SCAN Scanner Card User's Manual Mechanical shock may open or close latching relays on the scanner card. Before enabling any external sources, open all relays by inserting the 2000-SCAN into the multimeter and turning on the power. To wire the circuitry to the screw terminals on the scanner card: 1.

  • Page 15: Typical Connecting Schemes

    Model 2000-SCAN Scanner Card User's Manual Section 2: Card connections and installation Typical connecting schemes This section discusses typical connections for the scanner card. Voltage connections The figure below shows typical connections for voltage measurements. Note that all channels are used in the 2-pole mode and that up to 10 voltage sources can be switched with this configuration.

  • Page 16: Resistance Connections

    Section 2: Card connections and installation Model 2000-SCAN Scanner Card User's Manual Resistance connections Making 2-pole connections The following figure shows typical 2-pole resistor connections. The 2-pole resistance configuration can be used to test up to ten devices under test (DUTs).
  • Page 17 Model 2000-SCAN Scanner Card User's Manual Section 2: Card connections and installation Making 4-pole connections Typical 4-pole resistance connections are shown in the following figure. This general configuration can be used with all channels to scan: • 4-wire resistance measurements •...

  • Page 18: Card Installation And Removal

    Model 2000-SCAN Scanner Card User's Manual Card installation and removal This section explains how to install and remove the 2000-SCAN scanner card from the DMM6500. All wiring connections must be complete before installing the 2000-SCAN. The information in this topic is intended only for qualified service personnel. Some of the procedures may expose you to hazardous voltages that could result in personal injury or death.

  • Page 19: Scanner Card Installation

    Turn off power to all instruments (including the multimeter), and disconnect all power cords. Make sure all power is removed and any stored energy in external circuitry is discharged. To prevent contamination of the 2000-SCAN that could degrade performance, handle the scanner card by the edges and covers only.
  • Page 20 Section 2: Card connections and installation Model 2000-SCAN Scanner Card User's Manual Figure 9: Lock card To install your 2000-SCAN: 1. Remove power from the DMM6500. 2. Disconnect the power cord and any other cables that are connected to the rear panel.

  • Page 21: Output Connections To The Multimeter

    Model 2000-SCAN Scanner Card User's Manual Section 2: Card connections and installation Output connections to the multimeter After installing the 2000-SCAN, connect the scanner card output leads to the multimeter rear panel jacks. To connect the output leads for 2-pole connection: 1.

  • Page 22: Scanner Card Removal

    Section 2: Card connections and installation Model 2000-SCAN Scanner Card User's Manual To connect the output leads for 4-pole connection: 1. Connect OUT A HI (red) to INPUT HI. 2. Connect OUT A LO (black) to INPUT LO. 3. Connect OUT B HI (red) to SENSE HI.

  • Page 23: Operation

    DMM6500 multimeter. See the DMM6500 User's and Reference Manuals for the necessary information. Signal limitation To prevent damage to the 2000-SCAN, do not exceed the maximum level specifications of the scanner card. Relay input signal limitations Channels 1 to 10 are all relay inputs. To prevent overheating or damaging the relays, never exceed the following maximum signal levels for these channels: •...

  • Page 24: Scanner Card Detection

    You can open and close channels on the DMM6500 from the CHANNEL and the SCAN swipe screens. To open and close channels from the CHANNEL swipe screen: 1. From the Channel tab on the swipe screen, select the SELECT icon to access the 2000-SCAN channel list. 2000-SCAN-900-01 Rev. A / April 2018...
  • Page 25 Model 2000-SCAN Scanner Card User's Manual Section 3: Operation 2. From the 2000-SCAN channel list, select the box next to the channel number to open or close it. Selecting the channel box again will open the channel, and the connection icon will move to the open state.

  • Page 26: Building A Scan

    Section 3: Operation Model 2000-SCAN Scanner Card User's Manual Controlling channels using the remote interface Use the SCPI command :SENSE:FUNC to program functions for the selected channels. For TSP, use the command channel.setdmm(). For example, to measure DC volts on channel 1, AC volts on channel 2, and 2-wire resistance on channel 3, you would use the following SCPI commands: :SENS:FUNC "VOLT:DC", (@1)
  • Page 27 If you selected the channels for your scan from the Channels tab on the swipe screen, you can skip this step. Figure 15: Add group of channels 2. From the 2000-SCAN channel list, select the box next to the channel number to select your channels. 3. Select OK to proceed to the Measurement Functions/Digitize Functions screen.

  • Page 28: Rtd Temperature Measurements

    From the trigger mode indicator on the home screen, select Abort Scan. RTD temperature measurements You can make resistance temperature detector (RTD) measurements when the 2000-SCAN is installed. The following section provides procedures for making temperature measurements from the front panel using the scanner card. For more detailed information on temperature measurements in general, refer to the Model DMM6500 Reference Manual.

  • Page 29: Setting Up An Rtd Measurement On The Front Panel

    Typical applications Resistor testing The 2000-SCAN can be used to test up to 10 resistors using 2-wire measurements or up to five resistors using 4-wire measurements. These tests use the DMM6500 2-wire and 4-wire resistance functions. 2000-SCAN-900-01 Rev. A / April 2018...
  • Page 30 The figure below shows a typical setup for making 2-wire resistance measurements. The following figure shows an equivalent circuit. The 2000-SCAN provides the switching function, while the resistance measurements are made by the DMM6500. Since only 2-pole switching is required for this application, one 2000-SCAN can be used to switch up to 10 resistors.
  • Page 31 Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Use the SCPI commands below to set up a 2-wire resistance test using the DMM6500 and your 2000-SCAN. *RST Puts the DMM in a known state FUNC 'RES', (@1:10) Sets the channels for 2-wire measurements Sets the range to 100 kΩ...
  • Page 32 Section 3: Operation Model 2000-SCAN Scanner Card User's Manual Four-wire resistance tests Precise measurements over a range of system and DUT conditions can be obtained by using the 4-wire measurement scheme shown below. Separate sense leads from the DMM6500 are routed through the scanner card to the DUT.
  • Page 33 Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Figure 19: Four-wire resistance test equivalent circuit Use the SCPI commands below to set up a 4-wire resistance test using the DMM6500 and your 2000-SCAN. *RST Puts the DMM in a known state...
  • Page 34 Model 2000-SCAN Scanner Card User's Manual Combining 2-pole and 4-pole switching The 2000-SCAN can combine 2- and 4-pole switching in various combinations. This is useful if you require 4-pole switching for only two resistors. The remaining resistors can be tested using conventional 2-pole switching.
  • Page 35 Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Measurement functions for each scanner channel are defined using the FUNCTION menu when building a scan. Measurement functions for this test would be set up as follows: Channels 1 and 2: 4W Ω...

  • Page 36: Current Measurements

    Model 2000-SCAN Scanner Card User's Manual Current measurements The 2000-SCAN is not intended for direct current measurements, but by installing a shunt resistor, you can measure and calculate current. There are no dedicated channels or channel routing to measure current on the scanner card. Shunt resistors can be installed for channels 1 and 6 to allow for indirect current measurements.
  • Page 37 Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Current shunt locations The following figure shows the locations for the user-installable current shunts. Figure 23: Current shunt locations Recommended current shunt values Hole spacing on the circuit board is intended for 1/4 W resistors. The resistance value depends on the current you are measuring;...
  • Page 38 Model 2000-SCAN Scanner Card User's Manual Current connections The figure below shows typical connections for measuring currents using the 2000-SCAN with current shunts installed. As noted, only channels 1 and 6 have current shunts installed, and this configuration can be used to scan the following: •...

  • Page 39: Measurement Considerations

    Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Measurement considerations Many measurements made with the 2000-SCAN are subject to effects that can seriously affect low-level measurement accuracy. The following sections discuss these effects and methods on minimizing them. Path isolation Path isolation is the equivalent impedance between any two test paths in a measurement system.

  • Page 40: Magnetic Fields

    Section 3: Operation Model 2000-SCAN Scanner Card User's Manual Magnetic fields When a conductor cuts through magnetic lines of force, a small current is generated. This may cause unwanted signals to occur in the test leads of a scanning system. If the conductor has sufficient length, even weak magnetic fields can create sufficient signals that affect low-level measurements.

  • Page 41: Ground Loops

    Model 2000-SCAN Scanner Card User's Manual Section 3: Operation Ground loops When two or more instruments are connected, you must take precautions to avoid unwanted signals from ground loops. Group loops typically occur when sensitive instrumentation is connected to other instrumentation with more than one signal return path such as power line ground.

  • Page 42: Keeping Connectors Clean

    Section 3: Operation Model 2000-SCAN Scanner Card User's Manual The following figure shows how to connect several instruments together to eliminate this ground loop problem. Here, only one instrument is connected to the power line ground. Ground loops are not typically a problem with instruments with isolated LO terminals.
  • Page 43 All Keithley trademarks and trade names are the property of Keithley Instruments. All other trademarks and trade names are the property of their respective companies. Keithley Instruments Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-800-935-5595 • www.tek.com/keithley 12/17...

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