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SCXI -1124

User Manual

Six-Channel Isolated Digital-to-Analog Converter Module

September 1999 Edition

Part Number 320712B-01

Summary of Contents for SCXI -1124

Page 1: ...SCXI 1124 TM Copyright 1994 1999 National Instruments Corporation All Rights Reserved User Manual Six Channel Isolated Digital to Analog Converter Module September 1999 Edition Part Number 320712B 01...

Page 2: ...905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Greece 30 1 42 96 427 Germany 089 741 31 30 Hong Kong 2645 3186 India 918052...

Page 3: ...AUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS...

Page 4: ...ART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY...

Page 5: ...4 Custom Cables 1 5 Unpacking 1 5 Chapter 2 Configuration and Installation 2 1 Module Configuration 2 1 Supplementary Jumper Configuration Information 2 3 Hardware Installation 2 3 Chapter 3 Signal Co...

Page 6: ...ront Connector Pin Assignments 3 3 Figure 3 2 DAC Channel Connection as Voltage Output 3 5 Figure 3 3 DAC Channel Connection as Current Output Internal Loop Supply 3 5 Figure 3 4 DAC Channel Connectio...

Page 7: ...allation of the SCXI 1124 into the SCXI chassis and cable wiring Chapter 3 Signal Connections describes the signal connections to the SCXI 1124 module via the SCXI 1124 front connector and via the rea...

Page 8: ...al Instruments AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X AT MIO 64F 5 MC MIO 16 NB MIO 16 and NB MIO 16X multichannel I O data acquisition boards unless otherwise noted MIO type board MIO type boar...

Page 9: ...ware system use either the application software LabVIEW or LabWindows manuals or the NI DAQ manuals to help you write your application If you have a large and complicated system it is worthwhile to lo...

Page 10: ...mments 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 man...

Page 11: ...ntrol several SCXI 1124s in a single chassis with one data acquisition board and in combination with other SCXI module types The SCXI 1325 shielded terminal block has screw terminals for easy signal a...

Page 12: ...cquisition libraries are functionally equivalent to the NI DAQ software Using LabVIEW or LabWindows software will greatly diminish the development time for your data acquisition and control applicatio...

Page 13: ...dware with NI DAQ software for PC compatibles The National Instruments NB Series data acquisition boards are packaged with NI DAQ software for Macintosh NI DAQ software for Macintosh comes with langua...

Page 14: ...rammer Manual Request Form at the end of this manual and send it to National Instruments Optional Equipment Equipment Part Number SCXI 1325 front terminal block 776573 25 SCXI 1340 cable assembly 7765...

Page 15: ...ctor is a special 48 pin DIN C male connector The manufacturer part number for the connector National Instruments uses is as follows ERNI Components Inc part number 033 273 The mating connector for th...

Page 16: ...allation This chapter describes the SCXI 1124 jumper configurations installation of the SCXI 1124 into the SCXI chassis and cable wiring Module Configuration The SCXI 1124 includes four jumpers that a...

Page 17: ...nicate with all of the other modules in each chassis On the unconnected modules the jumper settings are irrelevant Tables 2 1 and 2 2 list the description and configuration of the jumper settings You...

Page 18: ...W4 in the M position If you are using the SCXI 1124 and MIO type board as well as modules with analog inputs you should cable the MIO type board to one of the analog input modules The SCXI 1124 cannot...

Page 19: ...ion and configuration instructions are in Chapter 1 Introduction to NI DAQ Find the installation and system configuration section for your operating system and follow the instructions given there If y...

Page 20: ...ategory requires local level supply mains connected installation DO NOT OPERATE DAMAGED EQUIPMENT The safety protection features built into this device can become impaired if the module becomes damage...

Page 21: ...e terminal block is not connected to the chassis To connect the safety earth when the terminal block is not connected to the chassis To connect the safety earth ground to the safety ground solder lug...

Page 22: ...124 front connector Pin Number Signal Name Column A B C Signal Name 30 29 26 25 22 21 18 17 14 13 10 9 6 5 2 1 ISINK 0 SUPPLY 0 GND 0 VOUT 0 ISINK 1 SUPPLY 1 GND 1 VOUT 1 ISINK 2 SUPPLY 2 GND 2 VOUT 2...

Page 23: ...oltage output and the loop supply C1 CHASSIS GND Chassis Ground This pin provides a ground reference for floating signals It is not a safety earth ground All other pins are not connected Analog Output...

Page 24: ...D SCXI 1124 SCXI 1124 High CMV VOUT VOUT load load VCM Figure 3 2 DAC Channel Connection as Voltage Output Figure 3 3 shows how to connect a DAC channel as a current output using the channel loop supp...

Page 25: ...ommon mode voltage ISINK c Load with high common mode voltage VEXT load I VCM High CMV SCXI 1124 VCM High CMV load VEXT I I ISINK I GND 0 20 mA 0 20 mA GND ISINK Figure 3 4 DAC Channel Connection as C...

Page 26: ...h ground connect the isolated ground of the channel to the chassis ground pin Do not use this pin as a safety earth ground because the ground trace cannot handle the potentially large currents that re...

Page 27: ...ATIN DAQD A SLOT0SEL MIO SERCLK DIGGND MIO SERDATOUT MIO DIO SERCLK DIO SERDATOUT DIGGND DIO Figure 3 6 SCXI 1124 Rear Signal Connector Pin Assignments Rear Signal Connector Signal Descriptions Pin Si...

Page 28: ...es active low All other pins are not connected See the Timing Requirements and Communication Protocol section in the SCXI 1124 Register Level Programmer Manual for more detailed information on timing...

Page 29: ...6 or 47 SERDATOUT is equivalent to SCXIbus MISO when jumper W2 is in position 1 Pins 26 and 47 are not tied together Pin 26 is for MIO type boards when SCXI 1124 jumpers W2 W3 and W4 are in the MIO po...

Page 30: ...XTSTROBE BDIO0 PB4 PB5 PB6 PB7 PC1 DOUT4 DOUT5 DOUT6 DOUT7 DIN6 PB3 PB2 PB1 PB0 PA0 APB3 APB2 APB1 APB0 APA0 DIOB3 DIOB2 DIOB1 DIOB0 DIOA0 The following specifications and ratings apply to the digital...

Page 31: ...ation Rear Signal Connector SCXIbus Connector SCXIbus Interface Circuitry Digital Interface and Control Calibration EEPROM Output Channel 0 Output Channel 5 Front Signal Connector Chassis Ground Buffe...

Page 32: ...ontains a Module ID register write circuitry for updating the DACs and an EEPROM for storing calibration constants The Module ID register contains the module ID 14 hex a code unique to the SCXI 1124 Y...

Page 33: ...llowing table shows typical ranges Table 4 1 Typical DAC Channel Ranges Nominal Range Typical Range 0 to 1 V 9 mV to 1 006 V 0 to 5 V 46 mV to 5 028 V 0 to 10 V 92 mV to 10 055 V 1 V 1 015 V to 1 015...

Page 34: ...of a channel to earth ground If the isolated ground of the channel is at a large common mode voltage with respect to earth shorting the voltage output to earth ground damages the module The voltage ou...

Page 35: ...p supply for sourcing current The current sink is an N channel power MOSFET sink to ground The current sink converts the voltage from the output of the unipolar or bipolar selection circuit In order f...

Page 36: ...of 3 to 42 V If the voltage is too low the SCXI 1124 cannot sink the full 20 mA If the voltage is too high overheating can occur and the module can be damaged You can use the loop supply on each SCXI...

Page 37: ...stics 1 5 or 10 V BL BH 4 095 Code Code Bipolar Voltage Output Characteristics 0 V 0 V 20 mA BL BH Code 4 095 0 mA Current Output Characteristics 1 5 or 10 V Figure 5 1 SCXI 1124 Output Characteristic...

Page 38: ...s chapter describes how to determine the calibration constants Calibration Methods Two Point Calibration Method With this method you program a channel with two different DAC codes measure the circuit...

Page 39: ...t Fit Actual Output LSB INL Boundary Not to Scale 1 2 Code 4 095 Figure 5 2 DAC Characteristics Second the INL of the DAC is specified on an endpoint fit The SCXI 1124 DACs have an INL of 0 5 LSB Ther...

Page 40: ...curve has a bend see Figure 5 1 you must use two codes that are on the sloped portion of the curve You should use 4 095 as the upper code For the lower code using the code 255 is recommended for simp...

Page 41: ...able to fit BL and BH onto the EEPROM In this case you will need to keep track of BL and BH elsewhere Measurement Technique When you measure voltage or current from the SCXI 1124 you should use a vol...

Page 42: ...istics Relative accuracy INL 1 2 LSB Absolute accuracy Current output 0 1 of full scale range max Voltage outputs 0 05 of full scale max DNL 1 LSB guaranteed monotonic Monotonicity Guaranteed over tem...

Page 43: ...temperature coefficient Unipolar range 1 ppm C typical 5 ppm C max Bipolar range 10 ppm C typical 20 ppm C max Gain temperature coefficient 25 ppm C typical 40 ppm C max Physical Dimensions 1 2 by 6 8...

Page 44: ...central time In other countries contact the nearest branch office You may fax questions to us at any time Corporate Headquarters 512 795 8248 Branch Offices Phone Number Australia 03 9879 5166 Austria...

Page 45: ...iciently 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 N...

Page 46: ...urrent configuration Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently SCXI 1124 Revi...

Page 47: ...l programmer manual Check all that apply National Instruments does not support your operating system or programming language You are an experienced register level programmer who is more comfortable wr...

Page 48: ...ptember 1999 Part Number 320694B 01 Please comment on the completeness clarity and organization of the manual If you find errors in the manual please record the page numbers and describe the errors Th...

Page 49: ...Analog Output Ground signal Arms amperes root mean square AWG American Wire Gauge C Celsius CHASSISGND Chassis Ground signal cm centimeters D A digital to analog D A Data Address signal DAC digital to...

Page 50: ...significant bit ppm parts per million RAM random access memory RC resistor capacitor RESET Reset signal rms root mean square RTSI Real Time System Integration SCXI Signal Conditioning eXtensions for I...

Page 51: ...rrect codes for current output 4 5 to 4 6 for voltage output circuitry 4 3 to 4 4 limitations 5 4 modification of constants 4 2 CHASSIS GND signal 3 4 chassis ground connections 3 7 configuration jump...

Page 52: ...on 3 5 internal loop supply illustration 3 5 as voltage output illustration 3 5 pin assignments illustration 3 3 signal descriptions 3 5 G GND 0 5 signal 3 4 H hardware installation 2 3 to 2 4 hazardo...

Page 53: ...3 to 1 4 unpacking 1 5 communication signals emulation by digital I O signal lines 3 9 to 3 10 SCXIbus to SCXI 1124 pin equivalences table 3 11 purpose 4 2 SERCLK signal 3 9 3 10 SERDATIN signal 3 9 S...

Page 54: ...4 3 to 4 4 block diagram 4 1 digital control circuitry 4 2 functional overview 4 1 major components of SCXI 1124 4 2 rear signal connector 4 2 SCXIbus connector and interface 4 2 U unipolar mode 4 3 u...

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