National Instruments SCXI-1102 User Manual
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National Instruments SCXI-1102 User Manual

32-channel thermocouple amplifier module
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SCXI-1102
User Manual
32-Channel Thermocouple Amplifier Module
January 1996 Edition
Part Number 320975A-01
© Copyright 1995, 1996 National Instruments Corporation.
All Rights Reserved.

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  • Page 1 SCXI-1102 User Manual 32-Channel Thermocouple Amplifier Module January 1996 Edition Part Number 320975A-01 © Copyright 1995, 1996 National Instruments Corporation. All Rights Reserved.
  • Page 2 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 (512) 794-0100 Technical support fax: (800) 328-2203 (512) 794-5678 Branch Offices: Australia 03 9 879 9422, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Canada (Ontario) 519 622 9310, Canada (Québec) 514 694 8521, Denmark 45 76 26 00, Finland 90 527 2321, France 1 48 14 24 24,...
  • Page 3 Limited Warranty The SCXI-1102 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor.
  • Page 4 Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used.

  • Page 5: Table Of Contents

    Related Documentation ....................ix Customer Communication ..................... ix Chapter 1 Introduction .......................... 1-1 About the SCXI-1102 ....................1-1 What You Need to Get Started ..................1-1 Software Programming Choices ..................1-2 LabVIEW and LabWindows/CVI Application Software ........1-2 NI-DAQ Driver Software................... 1-2 Register-Level Programming ................
  • Page 6 Figure 3-2. Ground-Referenced Signal Connection ............. 3-4 Figure 3-3. Floating Signal Connection Referenced to Chassis Ground ......3-5 Figure 3-4. SCXI-1102 Rear Signal Connector Pin Assignments ........3-6 Figure 4-1. SCXI-1102 Block Diagram................4-1 Tables Table 2-1. Jumper Settings for Digital Signal Connection ........... 2-3 Table 3-1.

  • Page 7: About This Manual

    About This Manual This manual describes the electrical and mechanical aspects of the SCXI-1102 and contains information concerning its installation and operation. The SCXI-1102 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the National Instruments data acquisition (DAQ) plug-in boards.

  • Page 8: Conventions Used In This Manual

    SCXIbus signals are in Chapter 3, Signal Connections. Slot 0 Refers to the power supply and control circuitry in the SCXI chassis. Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the Glossary. SCXI-1102 User Manual viii © National Instruments Corporation...

  • Page 9: National Instruments Documentation

    About This Manual National Instruments Documentation The SCXI-1102 User Manual is one piece of the documentation set for your data acquisition system. You could have any of several types of manuals, depending on the hardware and software in your system. Use the manuals you have as follows: •...

  • Page 10: Chapter 1 Introduction

    SCXI-1102 has 32 differential analog input channels and one cold-junction sensor channel. On each channel, the SCXI-1102 has a 3-pole lowpass filter with a 1 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 board channel.

  • Page 11: Software Programming Choices

    NI-DAQ Driver Software The NI-DAQ driver software is included at no charge with all National Instruments DAQ hardware. NI-DAQ has an extensive library of functions that you can call from your application programming environment. These functions include routines for analog input (A/D conversion),...

  • Page 12: Register-Level Programming

    Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware Register-Level Programming The final option for programming any National Instruments DAQ hardware is to write register- level software. Writing register-level programming software can be very time-consuming and inefficient and is not recommended.

  • Page 13: Optional Equipment

    Introduction Chapter 1 Optional Equipment You can use the following National Instruments products with your SCXI-1102: • SCXI-1300 front terminal block • SCXI-1303 front terminal block • SCXI-1340 cable assembly • SCXI-1341 Lab-NB/Lab-PC+ cable assembly • SCXI-1342 PC-LPM-16 cable assembly •...

  • Page 14: Unpacking

    Chapter 1 Introduction Unpacking Your SCXI-1102 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 15: Configuration And Installation

    Chapter 2 Configuration and Installation This chapter describes how to configure the SCXI-1102 jumper and how to install the SCXI-1102 into the SCXI chassis. Module Configuration The SCXI-1102 contains one jumper, shown in Figure 2-1. Jumper W1 connects a pullup resistor to the SERDATOUT signal on the rear signal connector.

  • Page 16: Figure 2-1. Scxi-1102 Parts Locator Diagram

    Configuration and Installation Chapter 2 RCL24-RCL31 Assembly number RCL14-RCL23 RCL0-RCL7 RCL8-RCL13 Serial Number Figure 2-1. SCXI-1102 Parts Locator Diagram SCXI-1102 User Manual © National Instruments Corporation...

  • Page 17: Digital Configuration

    SERDATOUT line. All SCXI modules have a jumper that corresponds to jumper W1 on the SCXI-1102. Refer to the user manuals of the other SCXI modules in your system to determine the designator and settings of this jumper. In the pullup position, this jumper connects a pullup resistor to the SERDATOUT line.

  • Page 18: Figure 2-2. Removing The Scxi Module Cover

    Change the W1 jumper setting. Reinstall the top cover and grounding screw. Grounding Screw Removable Cover Top of Module Front Connector Figure 2-2. Removing the SCXI Module Cover SCXI-1102 User Manual © National Instruments Corporation...

  • Page 19: Analog Configuration

    The SCXI-1102 has pads for transforming individual channels to current-to-voltage converters. National Instruments offers an SCXI process-current pack of four 249 Ω, 0.1%, 5 ppm, 1/4 W resistors. The reference designators for the current loop resistors have the format: for input channel x, the resistor is RCLx.

  • Page 20: Hardware Installation

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

  • Page 21: Chapter 3 Signal Connections

    Chapter 3 Signal Connections This chapter describes the input and output signal connections to the SCXI-1102 module via the SCXI-1102 front connector and rear signal connector. This chapter also includes specifications and connection instructions for the signals on the SCXI-1102 connectors.

  • Page 22: Front Connector

    Signal Connections Chapter 3 Front Connector Figure 3-1 shows the pin assignments for the SCXI-1102 front connector. Signal Column Signal Name Name Number CH0+ CGND CH1+ CH2+ CH3+ CH4+ CH5+ CH6+ CH7+ CH8+ CGND CH9+ CH10 CH10+ CH11 CH11+ CH12...

  • Page 23: Front Connector Signal Descriptions

    (CJSENSOR)—is also filtered and multiplexed to the module output buffer. The differential input signal range of an SCXI-1102 input channel is ±10 V/G, where G is the gain selected on the SCXI-1102 input channel. This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs.

  • Page 24: Ground-Referencing Your Signals

    Do not ground signals which are already ground-referenced; doing so will result in a ground loop, which adversely affects your measurement accuracy. CH0 + CH0 - CH1 + CH1 - SCXI - 1102 Figure 3-2. Ground-Referenced Signal Connection SCXI-1102 User Manual © National Instruments Corporation...

  • Page 25: Cold-Junction Sensor Connection

    SCXI-1303 terminal blocks to the SCXI-1102. The CJSENSOR signal is measured relative to CGND. Pins A3 and A4 are connected within the SCXI-1102 so the position of the MTEMP/DTEMP jumper on the SCXI-1300 or SCXI-1303 does not matter. The input is overvoltage-protected to 15 VDC with power on and off.

  • Page 26: Rear Signal Connector

    Chapter 3 Rear Signal Connector Note: If you are using the SCXI-1102 with a National Instruments DAQ board 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, read this section.

  • Page 27: Rear Signal Connector Descriptions

    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, if necessary. © National Instruments Corporation...

  • Page 28: Digital I/O Signal Connections

    Pins 24 through 27, 29, 33, 36, 37, 43, and 46 constitute the digital I/O lines of the rear signal connector. The SCXI-1102 digital input and output signals match the digital I/O lines of the MIO-16 boards. When used with an SCXI-1341, SCXI-1342, or SCXI-1344 cable assembly, the SCXI-1102 signals match the digital lines of the Lab-NB/PC/PC+, the PC-LPM-16, and the Lab-LC boards, respectively.

  • Page 29: Chapter 4 Theory Of Operation

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

  • Page 30: Rear Signal Connector, Scxibus Connector, And Scxibus Interface

    Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface The SCXIbus controls the SCXI-1102. The SCXIbus interface connects the rear signal connector to the SCXIbus, allowing a DAQ board to control the SCXI-1102 and the rest of the chassis. Digital Control Circuitry The digital control circuitry consists of the Address Handler and the following registers: Module ID, Configuration, Status, EEPROM, Gain, and Channel.

  • Page 31: Analog Input Channels

    The 3 µs scan interval gives you a maximum sampling rate of 333 kHz. Because this rate is much higher than the 1 Hz bandwidth of a single SCXI-1102 channel, you can sample multiple channels on multiple SCXI modules without undersampling one of the SCXI-1102 channels.

  • Page 32: Chapter 5 Calibration

    National Instruments software to store the calibration data in the EEPROM, refer to the SCXI-1102 Register-Level Programmer Manual for a more a detailed description of the EEPROM. In order to calibrate the SCXI-1102, you will need to apply precision voltages to the channel inputs and/or ground the channel inputs. Calibration Procedure...

  • Page 33: Gain And Offset Calibration

    CB-50 pins 3 and 4, respectively. Gain and Offset Calibration To determine the offset and gain calibration factors of the SCXI-1102 for a given gain, perform the following steps for a two-point calibration. For two-point calibration, it is best to use input voltages that correspond to the signal range of interest.

  • Page 34: Sample Program For Calibration

    DMM must be entered by hand. Before running this program,you must run WDAQCONF or DAQCONF to set up the DAQ board that will communicate with the SCXI-1102. This program is written for the four-slot SCXI-1000 chassis. The program prompts for all required configuration information about the SCXI chassis.
  • Page 35 = 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 36 Chapter 5 Calibration printf("Enter SCXI-1102 output voltage: "); fflush(stdin); ret = scanf("%lf", &voutput1); /* User enters voutput1. */ } while (!ret); printf("Apply input voltage for point 2, channel %d, gain %.0f.\n", moduleChan, gain); printf("Enter SCXI-1102 input voltage: "); fflush(stdin); ret = scanf("%lf", &vinput2);...

  • Page 37: Appendix A Specifications

    Appendix A Specifications This appendix lists the specifications for the SCXI-1102. These specifications are typical at 25° C unless otherwise noted. Analog Input Input Characteristics Number of channels ............... 32 differential Input signal ranges ..............±100 mV (gain = 100) or ±10 V (gain = 1) Max working voltage (signal + common mode) ....
  • Page 38 Storage temperature ............... -55° to 150° C Relative humidity ..............5% to 90% noncondensing Includes effects of AT-MIO-16E-2 using 1 or 2 m SCXI cable assembly. Includes effects of AT-MIO-16X using 1 or 2 m SCXI cable assembly. SCXI-1102 User Manual © National Instruments Corporation...

  • Page 39: Customer Communication

    Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster. National Instruments provides comprehensive technical assistance around the world. In the U.S. and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to 6:00 p.m.
  • Page 40 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 41 Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 42 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 User Manual Edition Date: January 1996 Part Number: 320975A-01 Please comment on the completeness, clarity, and organization of the manual.

  • Page 43: Glossary

    DIFF differential configuration digital input signal direct memory access differential nonlinearity DOUT digital output signal EISA Extended Industry Standard Architecture Engineering Software Package EXTCONV external control signal to trigger A/D conversions © National Instruments Corporation Glossary-1 SCXI-1102 User Manual...
  • Page 44 PCMCIA bus (usually +5V) volts, direct current virtual instrument volts, input high volts, input low V in volts in volts, output high volts, output low SCXI-1102 User Manual Glossary-2 © National Instruments Corporation...

  • Page 45: Index

    DAQD*/A signal (table), 3-7 DIGGND signal (table), 3-7 digital configuration, 2-3 to 2-4 jumper settings (table), 2-3 removing SCXI module cover block diagram of SCXI-1102, 4-1 (figure), 2-4 digital control circuitry, 4-2 © National Instruments Corporation Index-1 SCXI-1102 User Manual...
  • Page 46 3-4 to 3-5 NI-DAQ driver software, 1-2 to 1-3 pin assignments (figure), 3-2 signal descriptions (table), 3-3 operation of SCXI-1102. See theory of gain and offset calibration, 5-2 to 5-3 operation. ground-referencing of signals, 3-4 to 3-5 optional equipment for SCXI-1102, 1-4...
  • Page 47 Index software programming choices, 1-2 to 1-3 LabVIEW and LabWindows/CVI parts locator diagram for SCXI-1102, 2-2 application software, 1-2 physical specifications, A-2 NI-DAQ driver software, 1-2 to 1-3 pin assignments register-level programming, 1-3 front connector (figure), 3-2 unpacking, 1-5 rear signal connector (figure), 3-6...
  • Page 48 4-3 analog circuitry, 4-2 analog input channels, 4-3 block diagram, 4-1 digital control circuitry, 4-2 functional overview, 4-1 major components of SCXI-1102, 4-2 rear signal connector, 4-2 SCXIbus connector, 4-2 SCXIbus interface, 4-2 unpacking the SCXI-1102, 1-5 SCXI-1102 User Manual Index-4 ©...

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