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National Instruments SCC-AI14 manual

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Table of contents for the manual

  • Page 1

    USER GUIDE SCC-AI Series Isolated Analog Input Modules The SCC-AI Series isolated analog input modules (SCC-AI XX ) can extract a relativ ely low-amplitude input signal from a high-commo n-mode voltage so the E Series D A Q de vice can measure the input sig nal. They also can amplify and filter the input signal, resulting in hig her measurement res[...]

  • Page 2

    SCC-AI Series Isolated Analog Input Modules 2 ni.com Conventions The follo wing con ventions are used in this guide: < > Angle brackets that contain numbers separated by an ellipsis represent a range of v alues associated with a bit or signal name—for e xample, ai<0..7>. This icon denotes a note, which alerts you to important inform a[...]

  • Page 3

    © National Instruments Corporation 3 SCC-AI Series Isolated Analog Input Modules ❑ One or more SCC-SG XX ❑ SCC-SG Series Strai n-Gauge Modules User Guide ❑ SC-2345 User Manual ❑ Read Me Fir st: Safety and Ra dio-Frequency Interference ❑ SC-2345 Q uick Reference L abel ❑ 68-pin Basic or E Series D A Q device, d ocumentation, and 68-pin [...]

  • Page 4

    SCC-AI Series Isolated Analog Input Modules 4 ni.com Installing the Module Caution R efer to the Read Me First: Sa fety and Radio-F requency Interf erence document before remo ving equipment co vers or connectin g/disconnect ing any si gnal wires A blue label stripe identifies the SCC- AI XX as an an alog input m odule. The label al so displays the[...]

  • Page 5

    © National Instruments Corporation 5 SCC-AI Series Isolated Analog Input Modules Connecting the Input Signals The SCC- AI XX has a f ixed scre w-terminal receptacle and a remo vabl e scre w-terminal block, as sho wn in F igure 1-2. Figur e 1-2. SCC-AI XX T wo-Part Screw-T erminal System After you install the SCC- AI XX , connect the input signals [...]

  • Page 6

    SCC-AI Series Isolated Analog Input Modules 6 ni.com Figu re 1-3. SCC-AI XX Signal Co nnecti ons The input s are designed in a floating (no nreferenced) singl e-ended conf iguration. If the measured signals are floating, con nect the negati ve input pin s, 1 and 3, to AISENSE on the SC-2345 te rminal block through a1 0k Ω to 100 k Ω resistor. F[...]

  • Page 7

    © National Instruments Corporation 7 SCC-AI Series Isolated Analog Input Modules If a high commo n-mode v oltage is present, conn ect the negati ve input pins, 1 and 3, t o the signal r eference. Figure 1-5 sh ows a ground-r eferenced signal co nnection on on e channel of t he SCC-AI XX . Figu re 1-5. Ground-Ref erenced Sign al Connection for t he[...]

  • Page 8

    SCC-AI Series Isolated Analog Input Modules 8 ni.com 4. In th e SCC Connecto r Block Configuration window , configure the SCC syst em as follows: a. Specify the SCC Carrier T ype . The location of the SCC sockets change depen ding on the S CC carrier type. b . Select the DAQ D e v i c e that is connected to the SC-2345. c. T ype the SCC Connector B[...]

  • Page 9

    © National Instruments Corporation 9 SCC-AI Series Isolated Analog Input Modules 10. If you mak e a selection mistak e, select the socket and click Remove . 11. Repeat steps 8 an d 9 for each ne wly installed SCC. 12. Clic k OK after completing all SCC entries. 13. Clic k OK to complete the conf iguration proces s and close MAX. Note Configuring t[...]

  • Page 10

    SCC-AI Series Isolated Analog Input Modules 10 ni.com T ab le 1-2 shows su ggested values for some o f the par ameters. Use d efault v alues for parameters not s hown. 9. Clic k Te s t to test the channel. Y ou should be ab le to vie w your measurement in the window that ap pears. Y ou hav e finis hed confi guring the N I-D A Qmx task or g lobal ch[...]

  • Page 11

    © National Instruments Corporation 11 SCC-AI Series Isolated Analog Input Modules Scal ing V oltage Me asur ement s If you c onf igured the S CC-AI XX using MAX and you are using NI-D A Q, the vo ltage reading you get from the E Series D A Q de vice accounts for the vo ltage scaling effect of the SCC-AI XX . Otherwise, since the v oltage measureme[...]

  • Page 12

    SCC-AI Series Isolated Analog Input Modules 12 ni.com Filter Characte ristics Number of poles ......... ...................... ......3 Rolloff ................... ................. .................60 dB/decade Cutoff freq uency (–3 dB) AI0 X ......... ................ ................. ......10 kHz AI1 X ......... ................ ..............[...]

  • Page 13

    © National Instruments Corporation 13 SCC-AI Series Isolated Analog Input Modules Environment al Operating temperature........ ................. ... 0 to 50 ° C Storage temperature ............................ ... –20 to 70 ° C Humidity ................. ................. .............. 10 to 90% RH, noncondens ing Maximum altitude ...........[...]

  • Page 14

    SCC-AI Series Isolated Analog Input Modules 14 ni.com Calibrating Gain and Offset Errors The SCC-AI XX is cal ibrated at the factory b efore shipmen t. If you want to adjust the gain of the SCC-AI XX in your sy stem using you r E Series D A Q de vice, you need a v oltage source that is sev eral times more accurate than the SCC it self and capable o[...]

  • Page 15

    © National Instruments Corporation 15 SCC-AI Series Isolated Analog Input Modules 9. Adjust the trimp ot labeled Gain located on the top of the SCC-AI XX . If the v alue you obtained in step 8 is less than the input voltage, turn the trimpot clockwise to increase the g a in. If it is greater th an the input vo ltage, turn the trimpot counterc lock[...]

  • Page 16

    SCC-AI Series Isolated Analog Input Modules 16 ni.com SCC-AI XX Module Pin Assignments Figure 1-6 shows the I/O connect or pins on the bottom of t he module. Figur e 1-6. SCC Module Bottom View T able 1-4 lists the sig nal correspondi ng to each I/O connector pin o n the bottom of the SCC-AI XX . A CH( X ) and A CH( X + 8) are the analog input chan[...]

  • Page 17

    © National Instruments Corporation 17 SCC-AI Series Isolated Analog Input Modules 9 + 6 V 10 GND 11 AG N D 12 REF5V 13 + 15 V 14 –15 V 15 — 16 — 17 — 18 — 19 — 20 — Tabl e 1-4. SCC-AI XX Module Pi n Assig nments ( Con tinued ) Pin Number Signal[...]

  • Page 18

    National Instrument s™, NI™, ni.com ™, and NI-D AQ ™ are trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering Na tiona l Instruments products, refer to the appropriate location: Help»Patents i n yo ur sof twa re , th e pa[...]