National Instruments NI 6115 manuale d’uso

DAQ NI 6115/6 120 User Man ual Multifun ction I/O De vices fo r PCI/PX I/Compa ctPCI Bus Comp uters NI 6115/6 120 User Ma nual August 200 2 Edition Part Numb er 32281 2B-01[...]

Supp ort Worl dwide Tec hnical Supp ort and Pro duct Inform ation ni.com Nati onal In strum ents C orpor ate He adqu arter s 11500 Nor th Mop ac Expressway Austin, T exas 787 59-3504 USA Tel: 512 683 0100 Worldwide Offices Aus tralia 03 987 9 5166, Au stria 0 662 45 79 90 0, Belgium 02 75 7 00 20, Braz il 55 11 3262 3 599, Can ada (Cal gary ) 403 2[...]

Important Information Warrant y The NI PC I-6115, NI PXI-6115, NI PCI-61 20, and NI PX I-6120 de vices are warran ted again st defe cts in mate rials an d workman ship f or a perio d of one year fr om the date of shipm ent, as ev idenced by rec eipts or othe r document ation. National Ins trument s will, at it s option, r epair or repl ace equip me[...]

Compliance FCC/Canad a Radio Freq uency Interfere nce Compliance Determining FCC Class The Fed eral Co mmunicati ons Commis sion ( FCC) h as rules t o prote ct wire less co mmunicat ions f rom inte rferen ce. The FCC places digi tal electron ics into two classes. Th ese classe s are known as Cl ass A (for use in indu strial-com mercial locations on[...]

Canadia n Depar tment o f Commun ications This Class B di gital appa ratus meet s all requirem ents of the Canadia n Interferen ce-Causin g Equi pment Re gulations. Cet appare il numériqu e de la classe B respe cte toutes les exi gences du Règlement sur le matériel brouilleur du Canada. Compliance to EU Directives Readers i n the Europea n Union[...]

© Nation al Instrum ents Cor poratio n vii NI 6115/ 6120 Use r Manu al Contents About This M anual Convention s ............. ........... ................. ........... ................. ........... ............ ................. ...... x i National Instruments Documentation ....... ................. ............ ........... ................. .....[...]

Contents NI 6115/6 120 User M anual viii ni.com Timing Signal Routing ...................... ........... ................. ............ ................. ........... ........ 3-10 Programmable Function Inputs . ........... ................. ........... ................. ............ .. 3- 12 Device and RTSI C locks ........... ................. ...[...]

Contents © Nation al Instrum ents Cor poratio n ix NI 6115/ 6120 Use r Manu al GPCTR1_OUT Signal ............. ........... ................. ........... ................. . 4-36 GPCTR1_UP_DOWN Signal ............. ........... ............ ................. ...... 4-37 FREQ_OUT Signal .................. ........... ........... ................. ...[...]

© Nation al Instrum ents Cor poratio n xi NI 6115/ 6120 Use r Manu al About This Manual This manual describes the electrical and mechanical aspects of the NI 611 5/6120 and co ntains i nformation concerning i ts operation and progr amming. The NI 6115 /6120 f amily in cludes the follo wing de v ices: • NI PCI-6 115 • NI PXI- 6115 • NI PCI-6 [...]

About This Ma nual NI 6115/6 120 User M anual xii ni.com bold Bold text denotes items th at you must select or click on in the so ftware, such as m enu items an d dialog bo x options . Bold te xt als o denotes parameter n ames and hard ware l abels. CompactPCI CompactPCI refers to the core specif ication def ined b y the PCI Ind ustrial Computer Ma[...]

About This Ma nual © Nation al Instrum ents Cor poratio n xiii NI 6115/ 6120 Use r Manu al • D A Q hardw are document ation—This docu mentation has detailed information about the DA Q hardware that plugs into or is connected to the computer . Use this documentation for hardware inst allation and conf iguration instru ctions, specif ication inf[...]

© Nationa l Instrum ents Cor poratio n 1-1 NI 6115/ 6120 Use r Manu al 1 Introduction This chapter describes t he NI 6115/6 120, list s what you need to get started, describ es the o ptional software and opti onal equi pment, an d explains how to unpack the device. About the NI 6115/6120 Thank you for bu ying an NI 6115/612 0. The NI 6115/6120 is [...]

Chapter 1 Introduction NI 6115/6 120 User M anual 1-2 ni.com you do not need the R TSI cable for system triggering and timing on the PXI. In addition, a phas e-locked loo p (PLL) circuit accomplis hes the synchron ization o f multip le NI P XI-6115/6 120 de vic es or oth er PXI de vices which sup port PLL synchroni zation b y all ow ing these de vi[...]

Chap ter 1 Int rodu cti on © Nationa l Instrum ents Cor poratio n 1-3 NI 6115/ 6120 Use r Manu al What Y ou Need to Get Started To set u p and use th e NI 6115/6120 , you need t he followi ng: ❑ A computer or a PXI/CompactPCI chassi s and controller (hereafter refer red to as the computer) ❑ At least one of the following dev ices: – NI PCI-6[...]

Chapter 1 Introduction NI 6115/6 120 User M anual 1-4 ni.com Software Programming Choices When programming National Instruments DAQ hardware, you can use an NI appli cation develop ment enviro nment (AD E) or other ADEs. In either case, you use NI-DAQ. NI-DAQ NI-DAQ, whic h shipped with the N I 6115/6120, has an extensive libra ry of functions that[...]

Chap ter 1 Int rodu cti on © Nationa l Instrum ents Cor poratio n 1-5 NI 6115/ 6120 Use r Manu al Figu re 1-1 . The Rel ations hip A mong t he Prog rammin g Enviro nment , NI-DAQ, and the Hardware T o do wnload a f ree copy of the mos t recent vers ion of NI-D A Q, click Download Software at ni.com . National Instr uments ADE Software LabVIEW feat[...]

Chapter 1 Introduction NI 6115/6 120 User M anual 1-6 ni.com D A Q hard ware . The se Act iv eX co ntro ls pr ovide a high -level prog ramm in g interface f or b uilding virtual in struments (VIs). F or V isual C++ dev eloper s, Measurement Studio of fers a set of V isual C++ clas ses and tools to integrate thos e classes into V isual C++ applicati[...]

Chap ter 1 Int rodu cti on © Nationa l Instrum ents Cor poratio n 1-7 NI 6115/ 6120 Use r Manu al • Route the analog lines separa tely from the digital lines. • When using a cable sh ield, use separate shields f or the analog and digital halves of the cable. Failure to do so results in noise coupling into the analog signals f rom transient dig[...]

Chapter 1 Introduction NI 6115/6 120 User M anual 1-8 ni.com Safety Information The follo wing s ection contains impor tant safety in formation that you must follow when installing and using the product. Do not operate the pro duct in a manner not specif ied in this document. Misuse of the pr oduct can re sult in a hazard. Y ou can compromise the s[...]

Chap ter 1 Int rodu cti on © Nationa l Instrum ents Cor poratio n 1-9 NI 6115/ 6120 Use r Manu al The follo wing is a descr iption of installatio n categories: • Installation Category I is for measurements p erformed on circuits not directly connec ted to MAINS 1 . This category is a sign al lev el such as vo ltages on a printed wire board ( PWB[...]

Chapter 1 Introduction NI 6115/6 120 User M anual 1-10 ni.com Below is a diagram of a sample installation.[...]

© Nationa l Instrum ents Cor poratio n 2-1 NI 6115/ 6120 Use r Manu al 2 Installing and Configuring the NI 6115/6120 This chapt er explains how to inst all and config ure the NI 6 115/6120. Installing the Software Before you ins tall the NI 6115/612 0, complete the follo wing steps to in stall the software: 1. Install the ADE, such as LabVIEW or M[...]

Chapter 2 Installin g and Confi guring the NI 6115 /6120 NI 6115/6 120 User M anual 2-2 ni.com or bus master de vices. NI recomme nds installing the NI PXI- 6115/61 20 in su ch a slot . Note The PXI specif ication requ ires all slots to suppor t b us master de vices, but the CompactPCI specif ication does not. If you install in a CompactPCI non -ma[...]

Chapter 2 Installi ng and Configu ring the N I 6115/612 0 © Nationa l Instrum ents Cor poratio n 2-3 NI 6115/ 6120 Use r Manu al 8. Replace the co ver . 9. Plug in and po wer on the compu ter . The NI PCI-6115/6120 is no w in stalled. Y ou are no w read y to con figure the hardw are and softw are. Configuring the Device Because of the NI standard [...]

© Nationa l Instrum ents Cor poratio n 3-1 NI 6115/ 6120 Use r Manu al 3 Hardware Over view This chapter presents an ov ervie w of the ha rdware f unctions on the NI 6115/6120. Fi gures 3-1 and 3 -2 pro vide blo ck diagrams fo r the NI 6115 and NI 6120, res pecti vely . Figu re 3-1 . NI 6115 Block Di agra m Timing PFI / Trigger I/O Connector RTSI [...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-2 ni.com Figu re 3-2 . NI 6120 Block Di agra m Analog Input The following sections describe in detail each AI category. Input Mode The NI 6115/6120 su pports onl y differen tial (DIFF) inp ut mode. F or more information about DIFF in put, refer to the Co nnecting Analog I nput Sign als sec[...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-3 NI 6115/ 6120 Use r Manu al Input Po lari ty and Inpu t Range The NI 6115 /6120 has bipolar in puts only . Bipolar in put means that the midpoin t of the i nput volta ge range is cen tered at zero volts. Y ou can independen tly configu re each channel for a dif ferent input[...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-4 ni.com Consideration s for Selecti ng Input R anges The range you select depends on the expected range of the incoming sign al. A large input rang e can accommodate a lar ge signal variation but red uces the voltage resolution. Choosing a smaller input range improves the voltage resoluti[...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-5 NI 6115/ 6120 Use r Manu al Analog Output The NI 6115 /6120 supplies two ch annels of AO voltag e at the I/O connector. Th e range is fixed at bipo lar ±10 V. The A O channels on the NI 611 5 contain 12-b it D A C s that are capab le of 4 MS /s for on e channel or 2.5 MS/s[...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-6 ni.com Figur e 3-3. Analog T rigger Blo ck Dia gram for t he NI 61 15/6 120 In belo w-low-le vel analog triggering mode, the trigger is generated when the signal value is less than lowValue , as shown in Figure 3-4. HighValue is un used. Figu re 3-4. Below-Low-Level Analog T riggering Mo[...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-7 NI 6115/ 6120 Use r Manu al Figu re 3- 5. Above-High -Level Anal og T r iggering Mode In inside- region anal og triggering mod e, the trigger is gener ated when the signal value is between the lowV alue and the hig hV alue , as Figu re 3 -6 shows. Figu re 3-6 . Insi de-Reg [...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-8 ni.com In lo w-hy steresis a nalog tri ggering mode, the trigge r is generat ed when the signal value is less than lowV alue , wi th th e hys tere sis s peci fied by highV alue , as Figure 3-8 sho ws. Figu re 3-8. Low-Hys ter esis An alog T r igger ing Mo de The analog trigger circ uit g[...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-9 NI 6115/ 6120 Use r Manu al Figur e 3-9. Effects of Hardware an d Softw are Filtering on Antialias ing Phase-Locked Loop Circuit ♦ NI PXI-611 5/61 20 A phase-locked loop (PLL) circuit accomp lishes the synchr onization of multip le NI PXI-61 15/6120 de vices o r other P X[...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-10 ni.com Figu re 3-1 0. PLL Bl ock Di agra m Correlated Digit al I/O The NI 6115 /6120 con tains eight li nes of DIO fo r general-p urpose use. You can software -configure gr oups o f indivi dual lin es for eith er input or output. The NI 611 5/6120 in cludes a FIF O for bu ffered operat [...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-11 NI 6115/ 6120 Use r Manu al conf igurabl e. Fo r ex ample, Figu re 3-11 sho ws the s ignal rout ing multiplexer for controlling the ST AR TSCAN signal. Figu re 3-11. ST AR TSCA N Sign al Rou ting This f igure s ho ws that ST AR TSCAN can be gener ated fr om a number o f so[...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-12 ni.com Programmabl e Function I nputs The 10 PFIs are connected to the signal routing m ultiplexer for each tim ing signal, and software can select one of the PFIs as the external s ource for a given timing s ignal. It is important to no te that any PFI can be used as an input by any ti[...]

Chapt er 3 Hard ware Ov ervi ew © Nationa l Instrum ents Cor poratio n 3-13 NI 6115/ 6120 Use r Manu al In PCI, you can access all se ven R TSI lines (R TSI<0..6>) through their R TSI cable. W ith the NI PXI-6115 /6120, R TSI<0..5> con nects to PXI T rigger < 0..5>, respecti vely , through t he NI PXI-611 5/6120 backplan e. In PX[...]

Chapte r 3 Hardwa re Overvi ew NI 6115/6 120 User M anual 3-14 ni.com Figu re 3-13. PXI RTSI Bu s Signal Co nnecti ons Refer to t he Connecting T iming S ignals s ection of Chapter 4, Connecting Sign als , for a descript ion of th e signal s sho wn i n Fig ures 3-12 and 3-13. PXI Bus Connector PXI Trigger (7) DAQ-STC TRIG1 TRIG2 CONVERT* UPDATE* WF[...]

© Nationa l Instrum ents Cor poratio n 4-1 NI 6115/ 6120 Use r Manu al 4 Connecting Signals This chapter describes how to connect input and ou tput signals to the NI 611 5/6120 usin g the devi ce I/O connecto r. I/O Connector Figure 4-1 shows t he pin assi gnments fo r the 68- pin I/O co nnector o n the NI 611 5/6120. A signal des cription follows[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-2 ni.com Figur e 4-1. I/O Connec tor Pin Assi gnmen t for the NI 61 15/612 0 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ACH0 – ACH1+ ACH1[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-3 NI 6115/ 6120 Use r Manu al I/O Connecto r Signa l Descri ptions Table 4 -2. Signal Descripti ons for I/O Co nnector Pin s Signal Name Referenc e Direc tion Descr ip ti on AC H<0..3>GND — — Ground for A nalog In put C hannels 0 th rough 3—Th ese pins are th e bia[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-4 ni.com PFI0/TRIG1 DGND Inp ut Output PFI0 /Trigge r 1— As a n i npu t, th is is eit her a PFI or th e source fo r the ha rdware anal og trigge r . PFI signals are explaine d in the C onnecti ng Tim ing Si gnals section later in th is chapte r . The hardw are an alog t rigger is explaine[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-5 NI 6115/ 6120 Use r Manu al PFI8/GPCT R0_SOURCE DGND Inp ut Output PFI8/Coun ter 0 Sour ce—As an input , this is a PFI. As an out put, thi s is the GPCT R0_SOU RCE si gnal. T his signal refle cts the actu al sourc e connec ted to the genera l-purpose c ounter 0. PFI9/GPCT [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-6 ni.com Table 4-4. Analog I/O Summary for the NI 6120 Signal Name Signal T ype and Direc tion Impedance Input/ Output Protection (V olts) On/Off Source (mA at V) Sink (mA at V ) Rise Time (ns) Bias A CH<0..3> + AI 10 0 G Ω to GND ±42 V to GND — — — ±300 pA A CH<0..3> [...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-7 NI 6115/ 6120 Use r Manu al T ypes of Signal Sources When making sig nal connections, you mus t first determine whether the signal sou rces are float ing or groun d-referen ced. The follow ing sections desc ribe t hese two types of si gna ls. Floating Signal So urces A float[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-8 ni.com source. You mus t tie the g round referen ce of a floati ng signal t o the NI 6115/ 6120 AI ground to es tablish a l ocal or onbo ard referen ce for the signal. Otherwise, the measured input signal varies as the source floats out of the common-mode input range. Ground-Referen ced S[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-9 NI 6115/ 6120 Use r Manu al Connections fo r Ground-Reference d Signal Sources Figures 4-2 and 4-3 show ho w to connect a grou nd-referenced signal source to a chann el on the NI 6 115 and NI 6120 , respectively. Figur e 4-2. Pseudodiffe renti al Input C onnec tions on the N[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-10 ni.com Figur e 4-3. Pseudodiffe rential Input C onnec tions on the NI 6120 for Gro und-Re feren ced Sign als W ith this type of connection, the PGIA rejects both the common-mode noise in the signal and the ground potential d iffe rence between the signal source and the d e vice ground, s[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-11 NI 6115/ 6120 Use r Manu al Connections fo r Nonre ferenced or Floating Signa l Source s Figures 4 -4 and 4-5 show h ow to connect a floating signal sour ce to a channel o n the NI 6115 and NI 612 0, resp ectively. Figur e 4-4. Di ffer ential Input Conn ecti ons o n the N I[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-12 ni.com Figur e 4-5. Di ffer ential Input Conn ecti ons o n the N I 61 20 for Nonr efere nced Sign als Figures 4-4 and 4-5 sho w a bias resistor connected between A CH0– and the floating s ignal source g round. This resistor provi des a return path for th e ±200 pA bias curr ent. A v a[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-13 NI 6115/ 6120 Use r Manu al Like any am pli fier , the com mo n-m ode re jec tio n rat io (CMR R) of the PGI A is limited at high frequency . This limitatio n has been compensated for in the design of the NI 6115/612 0 by u sing a common-mo de choke on each channel. ♦ NI [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-14 ni.com Connecting Analog Output Signals The AO signals are DAC0OUT, DAC1OUT, and AOGND. D A C0 OUT is the v oltage output signal for A O channel 0. D A C1OUT is the vo ltage output signal f or A O channel 1. A OGND i s the ground-reference signal for the A O ch annels. A O GND is a hard [...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-15 NI 6115/ 6120 Use r Manu al Connecting Digital I/O Signals The DIO signals are DIO<0..7> and DGND. DIO<0..7> are the signals making up t he DIO port, and DGND is the ground -reference s ignal for the DIO port . You can p rog ra m grou ps of in divi du al lin es [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-16 ni.com Figure 4-7 sho ws DIO<0. .3> conf igu red for digi tal inpu t and DIO< 4..7> conf igured for d igital output. Digital input application s include recei ving TTL signals and s ensing e xternal de vice states such as the switch state sho wn in Figure 4- 7. Digital output[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-17 NI 6115/ 6120 Use r Manu al Figu re 4-8. Clock Sign al Dri ving DI and DO Si gnal s Figure 4- 9 sho ws a DIO o peration dr i ven b y the A O Update si gnal on its rising edge. Figu re 4-9. Rising-Ed ge AO Updat e Signal Dri ving a DIO Signal CLK DI<7:4> DO<3:0> [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-18 ni.com Figure 4-10 sho ws a DIO operat ion dri v en b y an R TSI clock s ignal on it s falling edge. Figur e 4-10. Fal lin g-Edge RTSI Cl ock Signa l Dr ivin g a DIO Sig nal Power Connections Two pins on the I /O connector sup ply +5 V from the computer power supply using a self-r esetti[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-19 NI 6115/ 6120 Use r Manu al The D A Q signals are e xplained in the DAQ Timing Connections section later in this chapte r . The Wav efo rm G ener ation Tim ing C onn ectio ns section later in this chapter explains the wa veform generation signals, and the General- Purpose T[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-20 ni.com Programmabl e Function I nput Con nections You can externally control 13 intern al timing signals fr om the PFI pins. The source for each of these si gnals is software-selectabl e from any PFI when you wa nt external control. This flexib le routin g scheme reduc es the need to cha[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-21 NI 6115/ 6120 Use r Manu al Figur e 4-12. T ypi cal Post triggere d Acquis ition Pretrigg ered data a cquisitio n allo ws you to vi ew data that i s acquire d before the trigger of interest in addition to data acqui red after the trigger . Figure 4-13 sho ws a typical pr et[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-22 ni.com Refer to Chapter 3 , Hardware Overview , for more info rmation on analog triggering. As an output, TRIG1 reflects the action that initiates a DA Q sequence e ven if another PFI is externally triggering the acquisiti on. The output is an acti v e high puls e with a pul se width o f[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-23 NI 6115/ 6120 Use r Manu al selection for either ris ing or falling edge. The selected ed ge of TRIG2 initiates the posttriggered phase of a pretriggered D A Q sequ ence. In pretriggered mode, the TRIG1 sign al initiates the acquisition. Th e scan counter indicates the mini[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-24 ni.com ST ARTSCAN Signal Any PFI pin can receiv e as an input the STARTSCAN signal, which is available as an output on the P FI7/STARTSCAN pin. Refer to Fig ures 4-21 and 4-22 for the relationship of STARTSCAN to the DA Q sequence. As an inpu t, ST A R TSCAN is configur ed in the edge-d [...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-25 NI 6115/ 6120 Use r Manu al Figu re 4-19. ST AR TSCA N Output Signal Tim ing The CONVER T* pulses are masked of f until the de vice generates ST AR TSCAN. If you are using internally generated conv ersions, the first CONVER T* appears when the o nboard samp le interv al cou[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-26 ni.com CONVERT* Signal Any PFI pin can receiv e as an input the CONVERT* sign al, which is available as an ou tput on the PFI2/CON VERT* pin. Refer to Figures 4-23 and 4-24 for the relationship of CO NVER T* to the D A Q sequence. As an input, CONVER T* is configured in the edge-detectio[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-27 NI 6115/ 6120 Use r Manu al The ADC switches to hold mo de within 20 ns of the selected edge. This hold-mode d elay time is a function of temperatu re and does not v ary from one con version to the ne xt. The sample interv al cou nter on the NI 6115/61 20 de vice nor mally [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-28 ni.com Either the 20 MHz or 10 0 kHz internal timebase generates SISOURCE unless you select some e xternal s ource. Figu re 4-22 sho ws the t iming requirements for SISOURCE. Figur e 4-22. SI SOU RCE Si gna l Timin g SCANCLK Signal SCANCLK is an output-only sig nal that g enerates a puls[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-29 NI 6115/ 6120 Use r Manu al EXTSTROBE* Signa l EXTSTROBE* is an output-only signal that generates either a single pulse or a sequence of eight pulses in the h ardware-strobe mode. An external device can use this signal to latch signals or to tr igger events. In the single-p[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-30 ni.com Figures 4-25 and 4- 26 sho w the ti ming requiremen ts for WFTRIG. Figur e 4-25. WF TRIG Input S ignal T i ming Figur e 4-26. WF TRIG Out put Si gnal Timing UPDA TE* Signa l Any PFI pin can receiv e as an input the UPDATE* sign al, which is available as an ou tput on the PFI5/UPDA[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-31 NI 6115/ 6120 Use r Manu al Figures 4-27 and 4-28 sho w the timing requirements for UPD A TE*. Figu re 4-27. UPD A TE* Input Signal Timi ng Figu re 4-28. UPD A TE* Outpu t Signa l Timing The D ACs ar e updated w ithin 100 ns of the lead ing edge. Separ ate the UPD A TE* pul[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-32 ni.com Figur e 4-29. UI SO URC E Sig nal Timin g The maximu m allo wed frequen cy is 20 MHz, with a minimum pu lse width of 10 n s hi gh o r low . Th ere i s no minim um freq uen cy limi ta tion. Either the 20 MHz or 100 kHz internal timebase n ormally generates UISOURCE un less you s el[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-33 NI 6115/ 6120 Use r Manu al Figur e 4-30 s ho ws th e timing r equir ements for GPCTR0 _SOURCE . Figur e 4-30 . GPCTR0_ SOURCE Si gnal T imin g The maximum allo wed fr equenc y is 20 MHz, with a minimum puls e width of 10 n s hi gh o r low . Th ere i s no minim um freq uen [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-34 ni.com Figur e 4-31 sho ws the timi ng requir ements for GPCTR0 _GA TE. Figu re 4-3 1. GPCTR0 _GA TE Signa l Timing in Edge -De tectio n Mode GPCTR0_OUT Sign al This signal is available as an output on the GPCTR0_OUT pin . The GPCTR0_OUT signal r eflects the terminal count (TC) of genera[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-35 NI 6115/ 6120 Use r Manu al GPCTR0_UP_DOWN Si gnal This signal can be received as an in put on the DIO6 pi n and is not available as an outpu t on the I/ O connecto r. The general-pu rpose coun ter 0 counts down when this pi n is at a logic low and count up when it is at a [...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-36 ni.com GPCTR1_GA TE Signal Any PFI pin can receiv e as an input the GPCTR1_GATE signal, which is available as an ou tput on the PFI4/GP CTR1_GATE pin. As an in put, GPCTR1_ GA TE is conf ig ured in edge-d etection mo de. Y ou can select any PFI pin as the source for GPCTR1_GA TE and conf[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-37 NI 6115/ 6120 Use r Manu al Figur e 4-34 sho ws the timi ng requir ements for GPCT R1_OUT . Figu re 4- 35. GP CTR1_OU T Signal Tim ing GPCTR1_UP_DOWN Si gnal This signal can be received as an in put on the DIO7 pi n and is not available as an output on the I/O conn ector. G[...]

Chapter 4 Connec ting Signals NI 6115/6 120 User M anual 4-38 ni.com The GA TE and OUT signal trans itions sho wn in Figure 4-36 ar e referenced to the rising ed ge of th e SOURCE s ignal. This tim ing diagram assumes that the coun ters are pr ogrammed to count risi ng edges. Th e same timi ng diagram, but with the source signal in verted and refer[...]

Chapter 4 Connec ting Sig nals © Nationa l Instrum ents Cor poratio n 4-39 NI 6115/ 6120 Use r Manu al Field Wiring Considerations Environmental noise can seriou sly affect the m easurement accuracy o f the NI 611 5/6120 if you do not take pr oper care when running s ignal wires between signal sour ces and the device. The following recomm endation[...]

© Nationa l Instrum ents Cor poratio n 5-1 NI 6115/ 6120 Use r Manu al 5 Calibration This chapter discu sses the calibration procedu res for the NI 6 115/6120. NI-DAQ includes calibr ation function s for performing all of the steps in the calibration proces s. Calibration refers to the proces s of minimizing measur ement and output vo ltage errors[...]

Chapter 5 Calibration NI 6115/6 120 User M anual 5-2 ni.com This method of calibration is not very accurate because it does not take into account the fact that the de vi ce measurement and output v oltage errors can v ary with time and temperature. It is better to self-calibrate when the device is installed in the environment in which it is used. S[...]

Chapter 5 Calibration © Nationa l Instrum ents Cor poratio n 5-3 NI 6115/ 6120 Use r Manu al T o e xternally calibrate your de vice, be s ure to use a very accurate e xternal reference. The r eference shou ld be se veral times more accurate than the de vice itself. For a detailed calibration procedure for the NI 611 5/6120, click Manual Calibratio[...]

© Nationa l Instrum ents Cor poratio n A-1 NI 6115/ 6120 Use r Manu al A Specifications This append ix lists the s pecif ications o f the NI 6115/ 6120. Thes e specifi cations are typical at 25 °C unless oth erwise noted. Analog Inpu t Input Characte ristics Number of channels ...................... ......... 4 pseudodifferential Type of ADC Reso[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A-2 ni.com ACH+ to AC HGND NI 6115.......................... ...........100 G Ω NI 6120.......................... ...........100 G Ω Input bias current ............. ................. ......±300 pA Input offs et current ................ ........... ......±200 pA Input coupling ....... ...[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-3 NI 6115/ 6120 Use r Manu al Table A-1. NI 6115 Anal og Input D C Accuracy Info rmation Nominal Range (V) Absolute Accuracy Relativ e Accuracy % of Reading Offset (mV) Noise + Quantizat ion (mV) Te m p Drift (%/°C) Absolute Accura cy at Full Sc ale ( ± mV) Resolution (mV) Full [...]

Appendix A Spec ification s NI 6115/6 120 User M anual A-4 ni.com Dynamic Characte ristics Interchannel skew ............ ................. ......1 ns typ Analog filters Number NI 6115.......................... ...........2 NI 6120.......................... ...........1 Type NI 6115.......................... ...........3-pole Bessel NI 6120 .......[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-5 NI 6115/ 6120 Use r Manu al Tabl e A-4. NI 6120 Analog Input Dyn amic Charac teristi cs Input Range Bandwidth (MHz) 1 SFDR T yp (dB) 2 SFDR Max (dB) 3 CMRR (dB) 4 System Noise (LSB rms ) 5 ±50 V 1.0 95 90 60 1.2 ±20 V 1.0 96 90 68 1.2 ±10 V 1.0 95 90 76 1.2 ±5 V 1.0 95 90 82[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A-6 ni.com Figur e A-1. NI 6115 T otal Harm onic Di stortion Plus Noise (THD + N) 0.1 38 44 50 56 62 68 74 1.0 10.0 THD+N ( – dBc) F requency (MHz) ±10 V ±5 V ±2 V ±1 V ±0.5 V ±0.2 V Full-Scale ( – 0.3 dB) Input Amplitude[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-7 NI 6115/ 6120 Use r Manu al Figur e A-2. NI 6120 T otal Harm onic Di stortion Plus Noise (THD + N) Full-Scale ( – 0.3 dB) Input Amplitude Frequency (kHz) 75 77 79 81 83 85 ± 5 V ± 2 V ± 1 V ± 0.5 V ± 0.2 V ± 10 V THD+N ( – dBc) 1 10 100[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A-8 ni.com Figu re A-3. NI 6115 High -V oltage THD + N 0.1 38 44 50 56 62 68 74 1.0 10.0 THD+N ( – dBc) F requency (MHz) High-V oltage Ranges, only ±10 V Input Amplitude ±50 V ±20 V[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-9 NI 6115/ 6120 Use r Manu al Figu re A-4. NI 6120 High- Vol tage T HD + N High-Voltage Ranges, only ±10 V Input Amplitude 80.0 80.5 81.0 81.5 82.0 82.5 83.0 83.5 84.0 84.5 85.0 1 10 100 Frequency (kHz) THD+N ( – dBc) ± 50 V ± 20 V[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A-10 ni.com Figur e A-5. N I 6115 THD + N wit h Filt ers 10 62 63.2 65.6 66.8 68 70.4 71.6 100 1000 THD+N ( – dBc) F requency (kHz) With Filters, Full-Scale Input f or Range of ±1 V 69.2 64.4 50 kHz 500 kHz[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-11 NI 6115/ 6120 Use r Manu al Figur e A-6. N I 6120 THD + N wit h Filt ers Stabili ty Recommended warm-u p time ............. ... 15 min Offset temperature coeff icient Pregain NI 6115 ................ ................. ... ±12 µ V/°C NI 6120 ................ .................[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A -12 n i.com Onboard calibration referenc e Level ......... ........... ........... .................5.000 V (±2.5 mV) (actual value stored in EEP ROM) Temperature coeff icient............. ......±4.1 ppm/°C max Long-term s tability ......... ................. Analog Outp ut Output Chara ct[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-13 NI 6115/ 6120 Use r Manu al Voltage Output Ranges ............... ................. ........... ......... ±10 V Output coupling............ ............ .............. DC Output impedance .............. ................. ... 50 Ω ±5% Current dr ive ..... ................. .[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A -14 n i.com Dynamic Characte ristics Slew rate NI 6115 ................ ........... .................300 V/ µ s NI 6120 ................ ........... .................15 V/ µ s Noise NI 6115 ................ ........... .................600 µ V rms , DC to 5 MHz NI 6120 ................ ...[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-15 NI 6115/ 6120 Use r Manu al Digi tal I/O Number of channels ...................... ......... 8 input/output Compatibility ............... ................. ......... TTL/CMOS Power-on state ......... ........... ................. ... Input (high-impedance) Data transfers ......[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A -16 n i.com Base clock accuracy............... ........... ......±0.01% Max source frequ ency...... ................. ......20 MHz Min source pulse dur ation .....................10 ns , edge-detect mod e Min gate pulse d uration ................... ......10 ns, edge-d etect mode Data transf[...]

Appendix A Specific ations © Nationa l Instrum ents Cor poratio n A-17 NI 6115/ 6120 Use r Manu al Digital T rigger Compatibility ............... ................. ......... TTL Response ................. ........... ........... ......... Rising or falling edge Pulse width ......................... ........... ......... 10 ns min RTS I Trigger lin[...]

Appendix A Spec ification s NI 6115/6 120 User M anual A -18 n i.com Maximum altitude.................. ........... ......2,000 meters Pollution Degree (indoor use only) ........2 Safe ty The NI 6115/6120 wa s e v aluated us ing the cri teria of EN 61010-1 a-2 :1995 and meets t he requirem ents of th e follo w ing standar ds for saf ety and electri[...]

© Nationa l Instrum ents Cor poratio n B-1 NI 6115/ 6120 Use r Manu al B Common Questions This appendix con tains a list of commonly asked ques tions and their answers relating to u sage and special features of the NI 611 5/6120. General Information What is the NI 61 15/6120? The NI 6115 /6120 is a switchless and jumperless enh anced MIO de vice t[...]

Appendix B Common Questions NI 6115/6 120 User M anual B-2 ni.com What typ e of 5 V p rot ection do es the NI 61 15/6120 have? The NI 6115 /6120 has 5 V lines equipped wi th a self- resetting 1 A fuse. How do I use the NI 6115/6120 with the NI-D A Q C API? The NI-DAQ User Manu al for PC Co mpatibl es describes t he general programming flo w when us[...]

Appendix B Common Questions © Nationa l Instrum ents Cor poratio n B-3 NI 6115/ 6120 Use r Manu al Analog Input and Output Why i s ther e a m inimum s ampling r ate on the NI 6115 ? The NI 6115 makes use of a pip elined ADC in order to achie v e high sampling rates. Samp ling at rates below 20 kS/s can result in im proper digitization, which appea[...]

Appendix B Common Questions NI 6115/6 120 User M anual B-4 ni.com I’m usin g the D A Cs to generat e a wa vef orm, but I discov er ed with a digita l oscilloscop e that ther e ar e glitch es on th e output si gnal. Is thi s normal? When the D AC switches fr om one v oltage to another , any D A C produces glitches due to released charges. The larg[...]

Appendix B Common Questions © Nationa l Instrum ents Cor poratio n B-5 NI 6115/ 6120 Use r Manu al T iming and Digital I/O What types of triggering can be hardwa re-implemented on the NI 6115/61 20? Hardware digital and analog triggering are both supported o n the NI 6115/612 0. If I’m using one of the general-purpose counter/timers on the NI 61[...]

Appendix B Common Questions NI 6115/6 120 User M anual B-6 ni.com Caution I f you enable a PFI line for output, do not connect an y external signal sour ce to it; if you do, you can damage the de vice, the computer , and the connected equipment. What are the power-o n states of the PFI and D IO lines on the I/O connector? At system power-on and res[...]

© Nationa l Instrum ents Cor poratio n C-1 NI 6115/ 6120 Use r Manu al C T echnical Support and Professional Ser vices Visit the followin g sections of the NI Web site at ni.com for technical support a nd prof essional servi ces: • Support — Online technical sup port resources include the follo wing: – Self-Help Resources —For immediate an[...]

© Nationa l Instrum ents Cor poratio n G-1 NI 6115/ 6120 Us er Manu al Glossar y Pref ix Meaning V alue p- pico- 10 –1 2 n- nano- 10 –9 µ -m i c r o - 1 0 –6 m- milli- 10 –3 k- kilo- 10 3 M- meg a- 10 6 Numbers/Sy mbols °d e g r e e > greater than ≥ greater than or equal to < less than ≤ less than or equal to /p e r % percent ?[...]

Gloss ar y NI 6115/6 120 User M anual G-2 ni.com A A amperes A/D analog-to-dig ital A C alternating current A CH analog in put channel s ignal A CH0GN D analog in put channel g round si gnal ADC an alog-to-digital con v erter—an electronic de vice, o ften an integrated circuit, that con verts an analog v oltage to a d igital number ADE applicatio[...]

Glossary © Nationa l Instrum ents Cor poratio n G-3 NI 6115/ 6120 Us er Manu al C CC e l s i u s C a l DAC c a l i b r a t i o n DAC cm centimeter CMOS complementary metal-oxide semicondu ctor CMRR common-mode rejection ratio—a measure of an ins trument to r eject interference fro m a common-mode s ignal, usually e xpressed in decibels (dB) Comp[...]

Gloss ar y NI 6115/6 120 User M anual G-4 ni.com D A Q-STC data acquisition s ystem timing controller—an app lication-specif ic integrated circuit (ASIC) for the system timing requirements of a general A/D and D/A system, such as a system containing the National Instruments E Series dev ices dB decibel—the unit for e xpressi ng a logarithmic m [...]

Glossary © Nationa l Instrum ents Cor poratio n G-5 NI 6115/ 6120 Us er Manu al ESD electrostatic dischar ge EXTSTR OBE* external s trobe signal F F farad—a measurem ent unit of capacitance FIFO first-in first-out memory buf fer—the first data stored is the first data sent to the acceptor ; often u sed on D A Q de vices to temporarily stor e i[...]

Gloss ar y NI 6115/6 120 User M anual G-6 ni.com GPCTR1_UP _DO WN general-p urpose cou nter 1 up dow n signal groun de d sign al sources signal sources with v oltage signals th at are referenced to a system grou nd, such as th e earth or a bui lding gro und; also called gr ounded sign al sources H h hour Hz hertz—the number of scans read or updat[...]

Glossary © Nationa l Instrum ents Cor poratio n G-7 NI 6115/ 6120 Us er Manu al L LabVI EW Labo rat ory V irtu al In stru ment E ngi nee rin g W ork benc h—a prog ra m de vel opment appl ication based on the prog ramming lan guage G an d used commonly for test and measuremen t purposes LED light emitting diode LSB least significant bit M master [...]

Gloss ar y NI 6115/6 120 User M anual G-8 ni.com N NC not connected (signal) NI National Instruments NI-D A Q National Instruments d ri v er softwa re for D A Q hardw are noise an undesirable electrical signal fr om external sou rces such as the A C po wer line, moto rs, generators, transfo rmers, fluorescent ligh ts, soldering irons, CR T displays[...]

Glossary © Nationa l Instrum ents Cor poratio n G-9 NI 6115/ 6120 Us er Manu al PFI2/CONVE R T* PFI2 /con vert PFI3/GP CTR1_SOURC E PFI3/gen eral purpo se counte r 1 source PFI4/GP CTR1_GA TE PFI4/gen eral-purp ose counter 1 gate PFI5/UP D A TE* PFI5/update PFI6/WFT RIG PFI6/wav eform trigg er PFI7/ST AR TSC AN PFI7/start of scan PFI8/GP CTR0_SOU [...]

Gloss ar y NI 6115/6 120 User M anual G-10 ni.com rise time the differ ence in time between th e 10% and 90% points o f the step respon se of a syst em rms root mean squar e R TD r esistiv e temperature detector—a metallic prob e that measures temperature bas ed upon its coef f icient of res isti vity R TSI bus real-time system integration bus—[...]

Glossary © Nation al Instrum ents Cor poratio n G-11 NI 6115/ 6120 Us er Manu al T TC terminal count—the ending v alue of a counter t gh gate hold time t gsu gate setup time t gw gate pulse width THD total harmonic distortion—the ratio o f the total rms signal due to harmonic distortion to the ov erall rms signal, in decib el or a percentage t[...]

Gloss ar y NI 6115/6 120 User M anual G-12 ni.com V Vv o l t s V CC collector common v oltage— po wer supp ly vol tage V cm common-mod e noise an d ground potential VCXO voltage-controlled crystal oscillator VDC v olts dir ect current VI virt ual instrumen t—(1) a combin ation of har dware an d/or so ftware elements, typically used with a PC, t[...]

© Nationa l Instrum ents Cor poratio n I-1 NI 6115/612 0 Use r Manual Index Numerics +5 V signal desc ript ion (ta ble) , 4-3 incorrect connec tions (caution), 4-15 self-resetting fus e, 4-18, B-2 A above-high-level analog trig gering mode, 3-7 AC inpu t couplin g, 3-4 ACH<0..3>– signal analog input signal co nnections, 4- 8 desc ript ion [...]

Index NI 6115/6 120 User M anual I-2 n i.com AOGND signal analog output signal connections, 4 -14 desc ript ion (ta ble) , 4-3 avoiding false tri ggering ( note), 3- 6 B base addres s for N I 6115/6120 device, B- 2 below-l ow-level analog tr iggering mode, 3-6 bipo lar inpu t, 3 -3 block diag ra ms analog trigger, 3-6 NI 611 5 block d iagram, 3-1 N[...]

Index © Nationa l Instrum ents Cor poratio n I-3 NI 6115/612 0 Use r Manual customer education, C-1 professi onal services, C -1 technical suppo rt, C-1 D DAC 0OU T sign al analog output signal connections, 4 -14 desc ript ion (ta ble) , 4-3 signal s ummary (tabl e), 4-5 DAC 1OU T sign al analog output signal connections, 4 -14 desc ript ion (ta b[...]

Index NI 6115/6 120 User M anual I-4 n i.com equipment , optional, 1 -6 example code, C-1 external calibration, 5-2 EXTSTROBE* signal desc ript ion (ta ble) , 4-3 signal s ummary (tabl e), 4-6 timing connections, 4-2 9 F field wiring cons iderations, 4-39 floati ng sign al sour ces desc ripti on , 4-7 signal co nnections, 4- 11 FREQ _OUT s igna l d[...]

Index © Nationa l Instrum ents Cor poratio n I-5 NI 6115/612 0 Use r Manual GPCTR1_OUT sig nal timing (figur e), 4-37 GPCTR1_UP_DOWN signal digit al I/O li nes , 3- 10 general-p urpose ti ming connect ions, 4-37 ground- referenced si gnal sources desc ripti on , 4-8 quest ion s abo ut, B -3 signal co nnections, 4- 9 H hardware installatio n proced[...]

Index NI 6115/6 120 User M anual I-6 n i.com N National Instrumen ts customer edu cation, C-1 documentation, xii professi onal services, C -1 system integr ation services, C-1 technical suppo rt, C-1 worldwide offices , C-1 NI 6115/61 20 device See also hardw are over view block diag ra ms NI 611 5 block d iagram, 3-1 NI 612 0 block d iagram, 3-2 c[...]

Index © Nationa l Instrum ents Cor poratio n I-7 NI 6115/612 0 Use r Manual PFI9/GP CTR0_GATE si gnal See also GPCTR0_GATE signal desc ript ion (ta ble) , 4-5 signal s ummary (tabl e), 4-7 PFIs (programmabl e function input s) quest ion s abo ut, B -5 signal n ame equivalenci es (table) , B-5 signal r outing , 3-10 timing connections, 4-2 0 phase-[...]

Index NI 6115/6 120 User M anual I-8 n i.com signal co nnections analog input connection s common-mo de signal r ejection, 4 -12 float ing sign al so urces , 4-1 1 ground- referenced si gnal sources, 4-9 nonreferenc ed signal s ources, 4-11 analog output connections, 4-14 data acquisition timin g connections AIGATE signal, 4-27 CONVERT* si gnal, 4-[...]

Index © Nationa l Instrum ents Cor poratio n I-9 NI 6115/612 0 Use r Manual bus interface, A-17 digit al I/O , A- 15 electromagnetic compatibility , A-18 environmental, A-17 physical , A-17 power r equirem ents, A -17 RTSI trigger lines, A- 17 safety, A -18 timing I/O, A-15 triggers analog trigger, A-16 dig ita l tr igge r, A -17 stability specifi[...]

Index NI 6115/6 120 User M anual I-10 ni.com TRIG1 sign al See also PFI0/ TRIG1 si gnal input timing (f igure), 4-22 output timi ng (figure ), 4-22 RTSI bu s sign al connect ions (figur e), 3-13 timing connections, 4-2 1 typical posttriggered acquisition (figur e), 4-21 typical pretriggered acqu isition (figur e), 4-21 TRIG2 sign al See also PFI1/ [...]