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Keithley 2001-TCSCAN User Manual

Scanner card for use with the dmm6500
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Model 2001-TCSCAN
Scanner Card for use with the DMM6500
User's Manual
2001-TCSCAN-900-01 Rev. A / April 2018
*P2001-TCSCAN-900-01A*
2001-TCSCAN-900-01A

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Summary of Contents for Keithley 2001-TCSCAN

  • Page 1 Model 2001-TCSCAN Scanner Card for use with the DMM6500 User’s Manual 2001-TCSCAN-900-01 Rev. A / April 2018 *P2001-TCSCAN-900-01A* 2001-TCSCAN-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 connectors and installation ................2-1 Introduction .......................... 2-1 Installation handling precautions ..................
  • Page 4 Table of contents Model 2001-TCSCAN Scanner Card User's Manual Magnetic fields ........................3-16 Electromagnetic interference (EMI) ..................3-16 Ground loops ........................... 3-17 Keeping connectors clean ....................... 3-18...
  • 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

    Factory service ................. 1-2 Introduction The 2001-TCSCAN scanner card is designed for use in a digital multimeter (DMM) to make accurate, multi-channel thermocouple measurements. The 2001-TCSCAN can also be used for multiple nine-channel, mixed-signal switching applications. The 500 nV - 125 V signal voltage range allows for both low and high signal levels.

  • 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 Connectors And Installation

    Card installation and removal ..........2-11 Introduction This section includes information on making connections to the 2001-TCSCAN Thermocouple General Purpose 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

    Do not attempt to perform this procedure unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death. Do not exceed the maximum specifications for the 2001-TCSCAN Thermocouple General Purpose Scanner Card. Refer to the specifications provided in the data sheet. Failure to recognize and observe normal safety precautions could result in personal injury or death.

  • Page 11: Card Configurations

    Model 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation Card configurations The following figure shows a simplified schematic of the 2001-TCSCAN. The scanner card has nine input channels and two output channels. Channel 1 is the reference junction for thermocouple temperature measurements.

  • Page 12: Card Connectors

    Section 2: Card connectors and installation Model 2001-TCSCAN Scanner Card User's Manual Card connectors The following figure shows the input and output connectors for the 2001-TCSCAN. Card connections include: • CH 2 to 10 (channels 2 to 10): HI and LO input terminals are provided for each of the nine channels on the card.

  • Page 13: Output Connections

    Model 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation Output connections Use the supplied test leads for scanner output connections. Connect the red leads to the output (OUT A and OUT B) HI terminals, and connect the black leads to the output LO terminals. See the following figure for details.

  • Page 14: Wiring Procedures

    Mechanical shock may open or close latching relays on the scanner card. Before enabling any external sources, open all relays by inserting the 2001-TCSCAN 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 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation Typical connecting schemes This section discusses typical connections for the scanner card. Thermocouple connections The figure below shows typical thermocouple connections. Note that thermocouples are connected to channels 2-10, and the output connections are taken from the OUT A terminals.

  • Page 16: Voltage Connections

    Section 2: Card connectors and installation Model 2001-TCSCAN Scanner Card User's Manual Voltage connections The following figure shows typical connections for voltage measurements. Note that up to nine voltage sources can be switched with this configuration. This basic configuration can be for the following measurement types: •...

  • Page 17: Resistance Connections

    Model 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation Resistance connections Two-pole resistance connections The following figure shows typical 2-pole resistor test connections. The 2-pole resistance configuration can be used to test up to seven devices under test (DUTs).
  • Page 18 Section 2: Card connectors and installation Model 2001-TCSCAN Scanner Card User's Manual Four-pole connections The following figure shows a typical 4-pole resistance connection. This configuration can be used with channel pairs 2 to 5 and 7 to 10 in order to scan: •...

  • Page 19: Card Installation And Removal

    Section 2: Card connectors and installation Card installation and removal This section explains how to install and remove the 2001-TCSCAN scanner card from the DMM6500. All wiring connections must be complete before installing the 2001-TCSCAN. 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 20: 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 2001-TCSCAN that could degrade performance, handle the scanner card by the edges and covers only.
  • Page 21 Model 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation Figure 10: Lock card To install your 2001-TCSCAN: 1. Remove power from the DMM6500. 2. Disconnect the power cord and any other cables that are connected to the rear panel.

  • Page 22: Output Connections To Multimeter

    Section 2: Card connectors and installation Model 2001-TCSCAN Scanner Card User's Manual Output connections to multimeter After installing your scanner card, connect the scanner card output leads to the rear panel of the DMM. Be sure to select the rear inputs with the DMM front panel TERMINAL switch when using the scanner card.

  • Page 23: Scanner Card Removal

    Model 2001-TCSCAN Scanner Card User's Manual Section 2: Card connectors and installation To make output connections for 4-pole operation: 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 24: Operation

    This section contains detailed information on front panel and remote interface operation of the 2001-TCSCAN. Before using the 2001-TCSCAN, you should be thoroughly familiar with the operation of the DMM6500 multimeter. See the DMM6500 User's and Reference Manuals for the necessary information.

  • Page 25: 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 2001-TCSCAN channel list. 2001-TCSCAN-900-01 Rev. A / April 2018...
  • Page 26 Model 2001-TCSCAN Scanner Card User's Manual Section 3: Operation From the 2001-TCSCAN 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 27: Building A Scan

    Section 3: Operation Model 2001-TCSCAN 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 28 Figure 15: Add group of channels 2. From the 2001-TCSCAN 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 29 Section 3: Operation Model 2001-TCSCAN Scanner Card User's Manual Selecting a measurement function assigns it to the channel you selected. To assign the same measurement function to all selected channels, select the same measurement function for each channel. Run a scan Once the scan is set up, you can run it.

  • Page 30: Typical Applications

    B, E, J, K, N, R, S, and T to make temperature measurements with your 2001-TCSCAN. The following procedure is for making thermocouple temperature measurements. Connect the thermocouples to the scanner card input connectors using the general scheme based on the figure below before making temperature measurements.
  • Page 31 Section 3: Operation Model 2001-TCSCAN Scanner Card User's Manual Use the SCPI commands below to set up your 2001-TCSCAN for temperature measurements on the DMM6500. *RST Puts the instrument in a known state FUNC 'TEMP', (@1:10) Sets the function to Temperature...

  • Page 32: Resistor Testing

    DMM6500. Since only 2-pole switching is required for this application, one 2001-TCSCAN can be used to switch up to seven resistors. However, the 240 Ω resistance of channels 5 and 10 may affect the measurement accuracy of 2-wire resistance measurements made using these channels.
  • Page 33 Section 3: Operation Model 2001-TCSCAN Scanner Card User's Manual Use the SCPI commands below to set up a 2-wire resistance test using the DMM6500 and your 2001-TCSCAN. *RST Puts the DMM in a known state FUNC 'RES', (@2:4, 6:9) Sets the channels for 2-wire measurements Sets the range to 100 kΩ...
  • Page 34 Model 2001-TCSCAN Scanner Card User's Manual Section 3: Operation Four-wire resistance tests More precise measurements over a wide range of conditions can be obtained by using the 4-wire measurement scheme shown in the figure below. Sense leads are routed from the DMM through the scanner to the resistor under test.
  • Page 35 Section 3: Operation Model 2001-TCSCAN Scanner Card User's Manual Figure 21: Four-wire resistance test equivalent circuit Use the SCPI commands below to set up a 4-wire resistance test using the DMM6500 and your 2001-TCSCAN. *RST Puts the DMM in a known state...
  • Page 36 Section 3: Operation Combining 2-pole and 4-pole switching The 2001-TCSCAN scanner card can combine 2- and 4-pole switching. For example, your configuration may require 4-pole switching for only two resistors, while the remaining resistors can be tested using conventional 2-pole switching. The figure below shows a test configuration using mixed 2- and 4-pole switching.

  • Page 37: Measurement Considerations

    Clears the buffer trigger.model.initiate() Initiates the scan Measurement considerations Thermocouple measurement error sources The temperature measurement accuracy specification of the 2001-TCSCAN is the sum of the following error sources: • Reference junction sensor error • Temperature gradient across the card •...

  • Page 38: Reference Junction Sensor

    Operating temperature is the primary factor in determining reference junction accuracy. Using the 2001-TCSCAN in the 18 °C to 28 °C range, maximum sensor performance is achieved. The 2001-TCSCAN may also be used over 0 °C to 18 °C and 28 °C to 50 °C with reduced accuracy. Path isolation Path isolation is the equivalent impedance between any two test paths in a measurement system.

  • Page 39: Magnetic Fields

    Section 3: Operation Model 2001-TCSCAN 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 40: Ground Loops

    Model 2001-TCSCAN 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 41: Keeping Connectors Clean

    Section 3: Operation Model 2001-TCSCAN 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 42 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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