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Chapter 1

Installing and Configuring the SCXI-1126

SCXI-1126 User Manual

1-2

ni.com

For easy signal attachment to the SCXI-1126, you can use a terminal block
to connect such signal connection options as screw terminals and BNC
connectors.

With the SCXI-1126, the SCXI chassis can serve as a fast-scanning signal
conditioner for laboratory testing, production testing, and industrial
process monitoring.

Detailed specifications of the SCXI-1126 are listed in Appendix A,

Specifications

Theory of Operation

This section contains a functional overview of the SCXI-1126 module and
explains the operation of each functional unit making up the SCXI-1126.

Functional Overview

The block diagram in Figure 1-1 illustrates the key functional components
of the SCXI-1126.

Figure 1-1.

SCXI-1126 Block Diagram

Optical Isolation

Optical Isolation

Optical Isolation

Frequency to

Voltage

Conversion

Range/Filter

Settings

Digital

Interface and

Control

Analog Bus

Switch

Multiplexer

8:1 Analog
Multiplexer

Buffer

CH0+

CH0–

CH1+

CH1–

CH7+

CH7–

AOGND

OUTREF

Scan Clock

Comparator with

Input Protection

Threshold and

Hysteresis

(8-bit

Resolution)

Optical Isolation

Optical Isolation

Frequency to

Voltage

Conversion

Range/Filter

Settings

Comparator with

Input Protection

Threshold and

Hysteresis

(8-bit

Resolution)

Frequency to

Voltage

Conversion

Range/Filter

Settings

Comparator with

Input Protection

Threshold and

Hysteresis

(8-bit

Resolution)

Calibration

EEPROM

Optical Isolation

F

ront Signal Connector

Rear Signal Connector

SCXIb

us Connector

– CH7 +

–

CH1 +

–

CH0 +

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Содержание SCXI-1126

Страница 1: ...SCXI TM SCXI 1126 User Manual Eight Channel Isolated Frequency Input Module for Signal Conditioning SCXI 1126 User Manual March 2003 Edition Part Number 321844C 01...

Страница 2: ...49 0 89 741 31 30 Greece 30 2 10 42 96 427 Hong Kong 2645 3186 India 91 80 51190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Malaysia 603 9059 6711 Mexico 0...

Страница 3: ...ce instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable c...

Страница 4: ...ialog box options Bold text also denotes parameter names italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a place...

Страница 5: ...0 Unpacking 1 10 Installing the SCXI 1126 Module into the SCXI Chassis 1 11 Connecting the SCXI 1126 to an E Series DAQ Device for Multiplexed Scanning in an SCXI Chassis 1 12 Connecting the SCXI 1126...

Страница 6: ...ations Appendix B Common Questions Glossary Index Figures Figure 1 1 SCXI 1126 Block Diagram 1 2 Figure 1 2 Installing the SCXI 1126 Module 1 11 Figure 1 3 Connecting an SCXI Chassis to an E Series DA...

Страница 7: ...anual Tables Table 2 1 Front Signal Pin Assignments 2 5 Table 2 2 SCXI 1126 Front Connector Signal Descriptions 2 6 Table 2 3 Rear Connector Signal Descriptions 2 8 Table 2 4 SCXIbus to SCXI 1126 Rear...

Страница 8: ...s the optional software and equipment About the SCXI 1126 The SCXI 1126 signal conditioning module is used in isolating frequency generating sensors and other analog and digital periodic signal source...

Страница 9: ...iew The block diagram in Figure 1 1 illustrates the key functional components of the SCXI 1126 Figure 1 1 SCXI 1126 Block Diagram Optical Isolation Optical Isolation Optical Isolation Frequency to Vol...

Страница 10: ...chassis up to 250 Vrms Each channel is also protected from input overvoltages up to 250 Vrms powered on or off This stage consists of a trigger circuit that compares the input waveform to a user prog...

Страница 11: ...it approximately 3 s after changing any of the settings to allow the channels to settle before you can take an accurate measurement NI DAQ automatically queries the module to determine when the module...

Страница 12: ...exed mode to perform scanning operations with the SCXI 1126 The SCXI chassis is programmed with a module scan list that dynamically controls which module sends its output to the SCXIbus during a scan...

Страница 13: ...led to the module has access to these outputs Note Since the SCXI 1126 provides programmable lowpass filters to average the output signals it is uncommon for a signal to vary faster than 1 kHz so samp...

Страница 14: ...nd software in your system Use the manuals you have as follows Getting Started with SCXI This is the first manual you should read It gives an overview of the SCXI system and contains the most commonly...

Страница 15: ...s when you are making the connections You can download NI documents from ni com manuals Software Programming Choices When programming National Instruments DAQ hardware you can use an NI application de...

Страница 16: ...For Visual C developers Measurement Studio offers a set of Visual C classes and tools to integrate those classes into Visual C applications The ActiveX controls and classes are available with Measure...

Страница 17: ...necting or disconnecting any signal wires Unpacking The SCXI 1126 module is shipped in an antistatic package to prevent electrostatic damage to the module Electrostatic discharge can damage several co...

Страница 18: ...s that is powered on 3 Insert the SCXI 1126 into an open slot in the SCXI chassis Gently guide the module into the slot guides and push it toward the back of the chassis until the front face of the mo...

Страница 19: ...art Guide to determine to which module to cable the E Series DAQ device To connect the chassis to an E Series DAQ device for multiplexed operation complete the following steps while referring to Figur...

Страница 20: ...n Chassis In this configuration you can multiplex all eight channels of the SCXI 1126 into a single channel of the E Series DAQ device in a combination PXI chassis You need the following items for thi...

Страница 21: ...o the Configuring and Self Testing section to configure the SCXI 1126 for multiplexed mode operation Configuring and Self Testing You can configure an SCXI system under Traditional NI DAQ Devices or N...

Страница 22: ...chassis address DIP switches to the OFF position If you are using multiple chassis or one or more of the chassis address DIP switches is not in the OFF position refer to the SCXI Chassis User Manual...

Страница 23: ...onfiguration When you have clicked Finish the module configuration is complete 7 Repeat steps 2 through 6 until you have added all the modules The SCXI chassis and SCXI module s should now be configur...

Страница 24: ...asurement Automation Explorer icon on the desktop 2 Click the next to the Devices and Interfaces icon If you are adding modules to an already configured chassis go to the Manually Adding and Configuri...

Страница 25: ...ve finished click OK 5 When you have completed configuring the module click OK The SCXI chassis and SCXI module s should now be configured properly If you need to change the module configuration right...

Страница 26: ...on 2 Change the configuration of the cabled module in the system from not being connected to connected to device x If you get the message Failed to find followed by the module codes and the message Un...

Страница 27: ...eturn to the Verifying and Self Testing the Configuration in NI DAQmx section and retest the SCXI chassis If these measures do not successfully configure the SCXI system refer to Appendix B Common Que...

Страница 28: ...d then click Finish You can now set the frequency range filter frequency threshold level and threshold hysteresis Frequency Range To set the frequency range complete the following steps 1 Select the c...

Страница 29: ...tab set the threshold hysteresis by entering the value in the Hysteresis box 3 Repeat steps 1 and 2 until you have configured all the channels Removing the SCXI 1126 This section provides details for...

Страница 30: ...for additional instructions and cautions To remove the SCXI 1126 module from an SCXI chassis complete the following steps while referring to Figure 1 4 1 Power off the SCXI chassis Do not remove the...

Страница 31: ...ing the SCXI 1126 SCXI 1126 User Manual 1 24 ni com Figure 1 4 Removing the SCXI 1126 1 Cable 2 SCXI 1126 3 SCXI Module Thumbscrews 4 Terminal Block 5 SCXI Chassis Power Switch 6 SCXI Chassis SC XI 11...

Страница 32: ...d signal to be referenced to a ground level with common mode voltage up to 250 Vrms Figure 2 1 shows how to connect a ground referenced signal to the SCXI 1126 Figure 2 2 shows how to connect a floati...

Страница 33: ...tion for the SCXI 1126 Referenced to Chassis Ground for Better Signal to Noise Ratio Caution Adding the bias resistor Rbias shown in Figure 2 2 breaks the isolation barrier F V CH CH Analog Ground Iso...

Страница 34: ...from the positive input channel to the signal reference to provide the DC path for the positive input bias current Typical resistor values range from 100 k to 1 M This solution although necessary in...

Страница 35: ...This section provides detailed information about the front and rear signal connectors If you are creating a custom terminal block using the SCXI 1330 terminal block read this section for information o...

Страница 36: ...A Column B Column C 32 CH0 CH0 31 30 CH1 CH1 29 28 NC NC 27 26 CH2 CH2 25 24 CH3 CH3 23 22 NC NC 21 20 CH4 CH4 19 18 CH5 CH5 17 16 NC NC 15 14 CH6 CH6 13 12 CH7 CH7 11 10 NC NC 9 8 NC NC 7 6 NC NC 5...

Страница 37: ...SCXI 1126 read this section Figure 2 5 shows the pin assignments for the SCXI 1126 rear signal connector These signals are described in the Rear Connector Signal Descriptions section Table 2 2 SCXI 11...

Страница 38: ...DIFF referenced single ended RSE or nonreferenced single ended NRSE modes go to ni com info and enter rdfwnc 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15...

Страница 39: ...sense pin of the E Series DAQ device in NRSE mode 24 33 DIG GND Digital Ground These pins supply the reference for E Series DAQ device digital signals and connect to the SCXI 1126 digital ground 25 S...

Страница 40: ...126 User Manual Table 2 4 SCXIbus to SCXI 1126 Rear Signal Connector to E Series DAQ Device Pin Equivalencies SCXIbus Line SCXI 1126 Rear Signal Connector E Series DAQ Device MOSI SERDATIN DIO0 D A DA...

Страница 41: ...e relative to calibration standards and require a 15 minute warm up period Specifications do not include transducer error Frequency Input Input Characteristics Number of channels 8 Input frequency ran...

Страница 42: ...s ground or any other input terminal Overvoltage protection1 250 Vrms powered on or off Inputs protected CH 0 7 Input impedance Powered on 50 G 0 5 to 4 5 V Overload 50 k 250 to 0 5 V and 4 5 to 250 V...

Страница 43: ...rs 90 Days 1 Year Peak RMS 250 Hz 0 0150 0 011 Hz 0 0217 0 018 Hz 0 0418 0 039 Hz 0 05 0 008 500 Hz 0 0150 0 023 Hz 0 0217 0 036 Hz 0 0418 0 077 Hz 0 10 0 015 1 kHz 0 0150 0 045 Hz 0 0217 0 073 Hz 0 0...

Страница 44: ...0 s 0 0015 accuracy2 20 s Output impedance Multiplexed output mode 100 Parallel output mode 330 Output short circuit protection Indefinite duration Outputs protected CH 0 7 Bandwidth 3 dB Hz Step Resp...

Страница 45: ...modes Scanning mode Parallel Retains last setting prior to software reset Parallel E Series DAQ device connection mode DIFF Retains last setting prior to software reset DIFF Input frequency range 0 12...

Страница 46: ...imensions 17 2 by 20 3 cm 6 8 by 8 0 in I O connectors 50 pin male ribbon cable rear signal connector 32 pin male DIN C front I O connector Input Frequency Ranges Temperature Drift of Reading C Hz C 2...

Страница 47: ...titude 2 000 m Pollution Degree indoor use only 2 Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and lab...

Страница 48: ...as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility 89 336 EEC Directive EMC Note Refer to the Declaration of Conformity DoC for this product for...

Страница 49: ...6 module in my SCXI chassis If I control it in multiplexed mode I get correct values when I read the channels If I control the module in parallel mode I get values that are not scaled back after the g...

Страница 50: ...p pico 10 12 n nano 10 9 micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 109 Symbols degree ohm per percent positive of or plus negative of or minus A A amperes A D analog to digital AC alternat...

Страница 51: ...quare AWG American Wire Gauge B b bit one binary digit either 0 or 1 B byte eight related bits of data an eight bit binary number Also used to denote the amount of memory required to store one byte of...

Страница 52: ...computer and possibly generating control signals with D A and or DIO devices in the same computer DAQD A the data acquisition device data address line signal used to indicate whether the SERDATIN puls...

Страница 53: ...second of a periodic signal The unit of measure for frequency I I O input output the transfer of data to from a computer system involving communications channels operator interface devices and or data...

Страница 54: ...ts noise an undesirable electrical signal noise comes from external sources such as AC power lines motors generators transformers fluorescent lights soldering irons CRT displays computers electrical s...

Страница 55: ...asurements are made with respect to a common reference measurement system or a ground Also called a grounded measurement system RSVD reserved bit pin or signal RTD resistance temperature detector a me...

Страница 56: ...in specified accuracy limits signal conditioning the manipulation of signals to prepare them for digitizing signal divider performing frequency division on an external signal SLOT0SEL slot 0 select si...

Страница 57: ...L transistor transistor logic U unipolar a voltage range that only spans positive voltages update the output equivalent of a scan One or more analog or digital output samples Typically the number of o...

Страница 58: ...ng self test verification 1 19 configuration settings excitation level 1 21 filter bandwidth 1 22 connecting SCXI 1126 to DAQ device See DAQ devices conventions used in the manual iv D DAC 1 bit 1 4 D...

Страница 59: ...L LabVIEW software 1 8 LabWindows CVI software 1 8 lowpass filter 1 4 M MCH0 through MCH7 signals table 2 8 Measurement Automation Explorer configuration procedure 1 14 manually adding modules 1 18 r...

Страница 60: ...8 SCXIbus to rear connector to DAQ board pin equivalencies table 2 9 self test verification steps for 1 16 1 18 troubleshooting 1 19 SERCLK signal description table 2 8 pin equivalencies table 2 9 SER...

Страница 61: ...ntrol circuitry 1 6 digital interface 1 6 frequency to voltage and analog circuitry frequency to voltage conversion stage 1 4 isolated input stage 1 3 multiplexed mode output stage 1 5 output stage 1...

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