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DAQ SCXI-1102 User Manual

32-channel thermocouple amplifier modules
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SCXI
-1102/B/C

User Manual

32-Channel Thermocouple Amplifier Modules
SCXI-1102/B/C User Manual
August 1997 Edition
Part Number 320975B-01
© Copyright 1995, 1997 National Instruments Corporation. All rights reserved.

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  • Page 1: User Manual

    ™ SCXI -1102/B/C User Manual 32-Channel Thermocouple Amplifier Modules SCXI-1102/B/C User Manual August 1997 Edition Part Number 320975B-01 © Copyright 1995, 1997 National Instruments Corporation. All rights reserved.
  • Page 2 Korea 02 596 7456, Mexico 5 520 2635, Netherlands 0348 433466, Norway 32 84 84 00, Singapore 2265886, Spain 91 640 0085, Sweden 08 730 49 70, Switzerland 056 200 51 51, Taiwan 02 377 1200, United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 Tel: (512) 794-0100...

  • Page 3: Important Information

    90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period.

  • Page 4: Table Of Contents

    Conventions Used in This Manual...................x National Instruments Documentation ................xi Customer Communication ....................xii Chapter 1 Introduction About the SCXI-1102/B/C Modules................1-1 What You Need to Get Started ..................1-2 Software Programming Choices ..................1-3 National Instruments Application Software ............1-3 NI-DAQ Driver Software ..................1-4 Register-Level Programming ................1-5 Optional Equipment ......................1-5...
  • Page 5 Chapter 5 Calibration Overview ......................... 5-1 Calibration Procedure...................... 5-1 Calibration Equipment Requirements ............... 5-1 Gain and Offset Calibration ................5-2 Appendix A Specifications Appendix B Calibration Sample Program Appendix C Customer Communication Glossary Index SCXI-1102/B/C User Manual © National Instruments Corporation...
  • Page 6 Figures Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware ..............1-4 Figure 2-1. SCXI-1102/B/C Module Parts Locator Diagram (1102 shown) .....2-2 Figure 2-2. Removing the SCXI Module Cover ............2-4 Figure 2-3. Bent and Trimmed Resistor..............2-5 Figure 3-1.

  • Page 7: About This Manual

    • SCXI-1102B • SCXI-1102C Unless otherwise noted, SCXI-1102/B/C will hereafter refer to all three modules in the SCXI-1102 family. The SCXI-1102/B/C modules are members of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the National Instruments data acquisition (DAQ) plug-in devices. These modules are designed for signal conditioning thermocouples, volt and millivolt sources, and 4–20 mA sources or 0–20 mA process-current...

  • Page 8: Conventions Used In This Manual

    • Appendix C, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products. • The Glossary contains an alphabetical list and description of terms used in this manual, including abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms.

  • Page 9: National Instruments Documentation

    Descriptions of all SCXIbus signals are in Chapter 3, Signal Connections. SCXI-1102/B/C Refers to all modules in the SCXI-1102 family unless otherwise noted. modules Slot 0 Refers to the power supply and control circuitry in the SCXI chassis.

  • Page 10: Customer Communication

    Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete.

  • Page 11: Introduction

    2 Hz cutoff frequency to reject 60 Hz noise. Each channel also has an amplifier with a selectable gain of 1 or 100. You can multiplex the SCXI-1102 inputs to a single output, which drives a single DAQ device channel.

  • Page 12: What You Need To Get Started

    Detailed specifications of the SCXI-1102/B/C modules are listed in Appendix A, Specifications. What You Need to Get Started To set up and use your SCXI-1102/B/C module, you will need the following items: One of the following modules: SCXI-1102...

  • Page 13: Software Programming Choices

    Chapter 1 Introduction Software Programming Choices You have several options to choose from when programming your National Instruments DAQ and SCXI hardware. You can use National Instruments application software, NI-DAQ, or register-level programming. National Instruments Application Software ComponentWorks contains tools for data acquisition and instrument control built on NI-DAQ driver software.

  • Page 14: Ni-Daq Driver Software

    DMA controllers. NI-DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code. Figure 1-1 illustrates the relationship between NI-DAQ and your National Instruments application software. ComponentWorks, Conventional...

  • Page 15: Register-Level Programming

    Optional Equipment National Instruments offers a variety of products to use with your SCXI-1102/B/C module, as follows: • Terminal blocks and 96-pin cables that allow you to attach input signals to your module.

  • Page 16: Custom Cables

    DIN C female connector Unpacking Your SCXI-1102/B/C module is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge can damage several components on the module. To avoid such damage in handling the module, take the following precautions: •...

  • Page 17: Configuration And Installation

    SCXI-1102/B/C module into the SCXI chassis. Module Configuration The SCXI-1102/B/C contains one jumper, shown in Figure 2-1. Jumper W1 connects a pullup resistor to the SERDATOUT signal on the rear signal connector.

  • Page 18: Figure 2-1. Scxi-1102/B/C Module Parts Locator Diagram (1102 Shown)

    Chapter 2 Configuration and Installation 1 RCL24-RCL31 3 RCL8-RCL13 5 RCL0-RCL7 7 W1 2 RCL14-RCL23 4 Assembly Number 6 Serial Number Figure 2-1. SCXI-1102/B/C Module Parts Locator Diagram (1102 shown) SCXI-1102/B/C User Manual © National Instruments Corporation...

  • Page 19: Digital Configuration

    If you have a one-chassis system, you do not have to read this section. You can skip to the next section, Analog Configuration. Note: If nothing is cabled to the SCXI-1102/B/C module rear signal connector, the position of jumper W1 is irrelevant. The SCXI-1102/B/C modules have only one jumper—jumper W1—for communication between the DAQ device and the SCXIbus, shown in Table 2-1.

  • Page 20: Analog Configuration

    Front Connector Figure 2-2. Removing the SCXI Module Cover Analog Configuration Current-Loop Receivers The SCXI-1102/B/C modules have pads for transforming individual channels to current-to-voltage converters. National Instruments offers an SCXI process-current pack of four 249 , 0.1%, 5 ppm, 1/4 W resistors.

  • Page 21: Figure 2-3. Bent And Trimmed Resistor

    8. Solder the leads to the pad on the bottom side of the module. 9. Slide the module back into its enclosure. 10. Reinstall the rear panel. 11. Reinstall the top cover and grounding screw. © National Instruments Corporation SCXI-1102/B/C User Manual...

  • Page 22: Hardware Installation

    1. Turn off the computer that contains the DAQ device or disconnect it from your SCXI chassis. 2. Turn off the SCXI chassis. Do not insert the SCXI-1102/B/C module into a chassis that is turned on. 3. Insert the SCXI-1102/B/C module into the module guides. Gently guide the module into the back of the slot until the connectors make good contact.

  • Page 23: Signal Connections

    Signal Connections This chapter describes the input and output signal connections to the SCXI-1102/B/C module via the module front connector and rear signal connector. This chapter also includes specifications and connection instructions for the signals on the SCXI-1102/B/C module connectors.

  • Page 24: Figure 3-1. Scxi-1102/B/C Module Front Connector Pin Assignments

    CH22+ CH23- CH23+ CH24- CH24+ CH25- CH25+ CH26- CH26+ CGND CH27- CH27+ CJSENSOR CH28- CH28+ CH29- CH29+ CJSENSOR CGND CH30- CH30+ +5 V CH31- CH31+ Figure 3-1. SCXI-1102/B/C Module Front Connector Pin Assignments SCXI-1102/B/C User Manual © National Instruments Corporation...

  • Page 25: Front Connector Signal Descriptions

    The differential input signal range of an SCXI-1102/B/C module input channel is 10 V/G, where G is the gain selected on the SCXI-1102/B/C module input channel. This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs.

  • Page 26: Ground-Referencing Your Signals

    ±42 VAC peak or VDC. Caution: Exceeding the input damage level (±42 VAC peak or VDC between input channels and chassis ground) can damage the SCXI-1102/B/C module, the SCXIbus, and the DAQ device. National Instruments is liable for any injuries resulting from such signal connections.

  • Page 27: Figure 3-2. Ground-Referenced Signal Connection

    Chapter 3 Signal Connections CH0+ CH0- CH1+ CH1- SCXI - 1102/B/C Figure 3-2. Ground-Referenced Signal Connection © National Instruments Corporation SCXI-1102/B/C User Manual...

  • Page 28: Cold-Junction Sensor Connection

    Cold-Junction Sensor Connection Pins A3 and A4 (CJSENSOR) connect the temperature sensor located on the SCXI-1300 or SCXI-1303 terminal blocks to the SCXI-1102/B/C module. The CJSENSOR signal is measured relative to CGND. Pins A3 and A4 are connected within the SCXI-1102/B/C module so the position of the MTEMP/DTEMP jumper on the SCXI-1300 or SCXI-1303 does not matter.

  • Page 29: Rear Signal Connector

    Rear Signal Connector Note: If you are using the SCXI-1102/B/C module with a National Instruments DAQ device and cable assembly, you do not need to read the remainder of this chapter. If you are using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1102/B/C module, read this section.

  • Page 30: Rear Signal Connector Descriptions

    Slot 0 controller instead of a module. SCANCLK Input Scan Clock—A rising edge indicates to the scanned SCXI module that the DAQ device has taken a sample and causes the module to advance channels. SCXI-1102/B/C User Manual © National Instruments Corporation...

  • Page 31: Analog Output Signal Connections

    1, 2, 4 or 19 to connect to the module’s analog ground (AGND). You can use the pin that is connected to AGND as a general analog power ground tie point to the SCXI-1102/B/C module, if necessary. Caution: The SCXI-1102/B/C module analog outputs are not overvoltage-protected.

  • Page 32: Digital Timing Signal Connection

    Chapter 3 Signal Connections the Lab-LC boards, respectively. Table 3-1 lists the equivalencies. For more detailed information, consult your cable installation guide. Table 3-1. SCXIbus to SCXI-1102/B/C Module Rear Signal Connector to DAQ Device Pin Equivalencies SCXIbus SCXI-1102/B/C MIO-16 Lab Boards...

  • Page 33: Theory Of Operation

    Chapter Theory of Operation This chapter contains a functional overview of the SCXI-1102/B/C module and explains the operation of each functional unit making up the SCXI-1102/B/C module. Functional Overview The block diagram in Figure 4-1 illustrates the key functional components of the SCXI-1102/B/C module.

  • Page 34: Rear Signal Connector, Scxibus Connector, And Scxibus Interface

    Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface The SCXIbus controls the SCXI-1102/B/C module. The SCXIbus interface connects the rear signal connector to the SCXIbus, allowing a DAQ device to control the SCXI-1102/B/C module and the rest of the chassis. Digital Control Circuitry...

  • Page 35: Analog Circuitry

    1 or 100. Then the signal passes through a three-pole lowpass filter. Note: Because of the 2 Hz bandwidth of the SCXI-1102 module input channels, you must wait approximately 3 s after changing the gains before the channels settle and you can take an accurate measurement. NI-DAQ automatically reads the Status Register to determine when the module output has settled.

  • Page 36: Analog Bus Switch

    The SCXI-1102/B/C modules contain switches to place their analog output on the SCXIbus to pass the output to the SCXI module cabled to the DAQ device. The SCXI-1102/B/C modules also contain switches to receive a signal placed on the SCXIbus by another SCXI module. The...

  • Page 37: Calibration

    20 to 30 C temperature range. In order to calibrate the SCXI-1102/B/C modules, you will need to apply precision voltages to the channel inputs and/or ground the channel inputs.

  • Page 38: Gain And Offset Calibration

    Chapter 5 Calibration To calibrate the SCXI-1102/B/C module, you need a voltmeter with the following specifications: • Accuracy 6 ppm standard reading 15 ppm sufficient reading • Range –10 to +10 V • Resolution 8.5 digits A multiranging 8.5-digit digital multimeter (DMM) can perform the necessary calibrations.
  • Page 39 This is also true for the positive full-scale voltage if you use the negative full-scale voltage and 0 V as your two calibration points. When you make a measurement using National Instruments software, the driver automatically uses the calibration constants to correct the measured voltages.

  • Page 40: Appendix A Specifications

    Appendix Specifications This appendix lists the specifications for the SCXI-1102/B/C modules. These specifications are typical at 25 C unless otherwise noted. SCXI-1102/B/C Analog Input Input Characteristics Number of channels ......32 differential Input signal ranges 100 mV (gain = 100) or...

  • Page 41: Dynamic Characteristics

    10 V Output impedance ......91 Dynamic Characteristics Bandwidth .......... 2 Hz (1102) 200 Hz (1102B) 10 kHz (1102C) Scan interval (per channel, any gain) 0.012% ........3 s 0.0061% ........10 s SCXI-1102/B/C User Manual © National Instruments Corporation...
  • Page 42 Gain = 100 ........1 V/ C Gain temperature coefficient ....10 ppm/ C Physical Dimensions .........115 by 273 mm (4.54 by 10.75 in.) I/O connector ........50-pin male ribbon cable rear connector 96-pin male DIN C front connector © National Instruments Corporation SCXI-1102/B/C User Manual...

  • Page 43: Power Requirements

    Storage temperature ......–55 to 150 C Relative humidity ....... 5% to 90% noncondensing Power Requirements 5 V supply .......... 15 mA max 15 V supply (regulated from 24 V supply) ......150 mA max SCXI-1102/B/C User Manual © National Instruments Corporation...

  • Page 44: Sample Program For Calibration

    Chapter 5, Calibration: SCXI_Cal_Constants This sample program assists the user in calibrating the SCXI-1102. The calibration constants are stored only in NI-DAQ memory. The (input, output) voltage pairs read by a DMM must be entered by hand. Before running this programed must run the NI-DAQ Configuration Utility to set up the DAQ board that will communicate with the SCXI-1102.
  • Page 45 = scanf("%d", &moduleSlot); } while (!ret || moduleSlot < 1 || moduleSlot > 4); modulesPresent[moduleSlot - 1] = SCXI1102; printf("Enter the chassis ID of the chassis containing the SCXI-1102: "); fflush(stdin); ret = scanf("%d", &SCXI_Chassis_ID); } while (!ret);...
  • Page 46 SCXI_Set_Gain(SCXI_Chassis_ID, moduleSlot, moduleChan, gain); /* Select the channel and gain. */ printf("Apply input voltage for point 1, channel %d, gain %.0f.\n", moduleChan, gain); printf("Enter SCXI-1102 input voltage: "); fflush(stdin); ret = scanf("%lf", &vinput1);/* User enters vinput1. */ } while (!ret);...
  • Page 47 /* Calculate offset and gain error. */ offset = bin_offset / scale; /* Convert from DAQ board format. */ printf("Calculated offset %f V, gain error %f%% ", offset, gainerr); printf("and stored in NI-DAQ memory.\n\n"); SCXI-1102/B/C User Manual © National Instruments Corporation...
  • Page 48 Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files and documents to answer most common customer questions. From these sites, you can also download the latest instrument drivers, updates, and example programs. For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information, call (512) 795-6990.
  • Page 49 Telephone and Fax Support National Instruments has branch offices all over the world. Use the list below to find the technical support number for your country. If there is no National Instruments office in your country, contact the source from which you purchased your software to obtain support.
  • Page 50 National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
  • Page 51 Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 52 Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: ™ SCXI -1102/B/C User Manual Edition Date: August 1997 Part Number: 320975B-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 53 Meanings Value –12 pico- –9 nano- –6 µ- micro- –3 milli- kilo- mega- giga- Numbers/Symbols +5 V +5 volt signal degrees ohms percent plus or minus amperes alternating current analog input channel signal © National Instruments Corporation SCXI-1102/B/C User Manual...
  • Page 54 Ports usually consist of either four or eight digital channels. CJSENSOR cold-junction sensor clock input signal CMOS complementary metallic oxide semiconductor CMRR common-mode rejection ratio SCXI-1102/B/C User Manual © National Instruments Corporation...
  • Page 55 DMA is the fastest method of transferring data to/from computer memory. digital millimeter differential nonlinearity—a measure in LSB of the worst-case deviation of code widths from their ideal value of 1 LSB © National Instruments Corporation SCXI-1102/B/C User Manual...
  • Page 56 FIFO ahead of time. This again reduces the effect of latencies associated with getting the data from system memory to the DAQ device. feet gain GATE gate input signal SCXI-1102/B/C User Manual © National Instruments Corporation...
  • Page 57 (signal) NRSE nonreferenced single-ended mode—all measurements are made with respect to a common (NRSE) measurement system reference, but the voltage at this reference can vary with respect to the measurement system ground © National Instruments Corporation SCXI-1102/B/C User Manual...
  • Page 58 RSVD reserved bit RTSI bus real-time system integration bus—the National Instruments timing bus that connects DAQ devices directly, by means of connectors on top of the boards, for precise synchronization of functions samples...
  • Page 59 (2) a LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program volts, input high volts, input low volts in volts, output high volts, output low © National Instruments Corporation SCXI-1102/B/C User Manual...
  • Page 60 A-1 to A-2 analog output signal connections, 3-9 AOGND signal (table), 3-8 DAQD*/A signal description (table), 3-8 SCXIbus to SCXI-1102/B/C to DAQ board pin equivalencies (table), 3-10 bent and trimmed resistor (figure), 2-5 DGND signal (table), 3-8 bulletin board support, C-1 digital configuration, 2-3 to 2-4 ©...
  • Page 61 (figure), 3-5 NI-DAQ driver software, 1-4 pin assignments (figure), 3-2 signal descriptions (table), 3-3 FTP support, C-1 operation of SCXI-1102/B/C. See theory of operation. OUTREF signal (table), 3-8 gain and offset calibration, 5-2 to 5-3 ground-referencing of signals, 3-4 to 3-6 SCXI-1102/B/C User Manual ©...
  • Page 62 Index SCXIbus to SCXI-1102/B/C to DAQ board pin equivalencies (table), 3-10 parts locator diagram, 2-2 SERCLK signal physical specifications, A-3 description (table), 3-9 pin assignments SCXIbus to SCXI-1102/B/C to DAQ front connector (figure), 3-2 board pin equivalencies (table), 3-10 rear connector (figure), 3-7...
  • Page 63 4-1 to 4-4 analog circuitry, 4-3 to 4-4 analog bus switch, 4-4 analog input channels, 4-3 block diagram of SCXI-1102/B/C, 4-1 digital control circuitry, 4-2 to 4-3 functional overview, 4-1 to 4-4 rear signal connector, 4-2 SCXIbus connector, 4-2...

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