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Chapter 3

Signal Connections

NI 660x User Manual

3-22

ni.com

Fig

u

re 3-12 shows an example of parallel and series termination.

Figure 3-12.  

Parallel and Series Termination Example

660

x

Driving Signal

Driving Signal

Receiving Signal

Receiving Signal

Parallel Termination

Series Termination

Other

Device

660

x

R

s

R

P

C

P

Other

Device

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Содержание NI660 Series

Страница 1: ...erutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In st...

Страница 2: ...er Manual NI 6601 NI 6602 and NI 6608 Devices NI 660x User Manual ni com manuals Deutsch Fran ais December 2012 372119C 01 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www...

Страница 3: ...rate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 For further support information refer to the Technical Support and Professional Services appendix To comment...

Страница 4: ...struments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to r...

Страница 5: ...CTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Artisa...

Страница 6: ...bject or if the product is used in residential or commercial areas To minimize interference with radio and television reception and prevent unacceptable performance degradation install and use this pr...

Страница 7: ...ting 2 6 Enabling Duplicate Count Prevention in NI DAQmx 2 7 When to Use Duplicate Count Prevention 2 7 When Not to Use Duplicate Count Prevention 2 7 Transfer Rates 2 8 High Precision Clock NI 6608 2...

Страница 8: ...rm Start Triggers 3 13 Counter Pairs 3 14 Counter Applications 3 14 Real Time System Integration Bus 3 14 RTSI Triggers 3 15 5 V Power Source 3 16 I O Signals 3 17 Field Wiring Considerations 3 17 Noi...

Страница 9: ...he device is operating properly NI 6601 6602 Calibration Procedure Contains instructions for calibrating the NI 6601 and NI 6602 NI 6608 Timing I O Device Calibration Procedure Contains instructions f...

Страница 10: ...Q Assistant PXI Hardware Specifications Revision 2 1 Introduces the PXI architecture and describes the electrical mechanical and software requirements for PXI Available at http www pxisa org PICMG Spe...

Страница 11: ...he NI 660x devices contain the National Instruments MITE PCI interface The MITE offers bus master operation PCI burst transfers and high speed DMA controller s for continuous scatter gather DMA withou...

Страница 12: ...2 Installing the NI DAQmx The DAQ Getting Started documents contain step by step instructions for installing software and hardware configuring channels and tasks and getting started developing an appl...

Страница 13: ...cable BNC 2121 BNC connector block with built in test features CA 1000 Configurable connector accessory SCB 68A Shielded screw connector block TB 2715 Front mount terminal block for NI PXI 660x TBX 6...

Страница 14: ...more information about the signals that can be driven onto PFI lines refer to the I O Connector Pinout section of this document For information about how to implement specific digital I O functions re...

Страница 15: ...the same external signal For example suppose counters 0 and 1 are configured for triggered pulse generation and each counter uses the same external trigger this external signal is connected to PFI 38...

Страница 16: ...d 2 3 illustrate how pad synchronization can be useful These figures assume a 0 5 and a 0 75 SOURCE cycle delay between the PFI 38 input pin and CTR 0 GATE and CTR 1 GATE respectively Figure 2 2 shows...

Страница 17: ...Duplicate count prevention applies only to buffered counter applications such as measuring frequency or period For such buffered applications the counter should store the number of times an external s...

Страница 18: ...2 because two Source pulses occurred after the previous rising edge of Gate The counter synchronizes or samples the Gate signal with the Source signal So the counter does not detect a rising edge in...

Страница 19: ...synchronizing to the timebase the counter detects edges on the Gate even if the Source does not pulse This enables the correct current count to be stored in the buffer even if no Source edges occur b...

Страница 20: ...ate Count Prevention Use duplicate count prevention for buffered measurements that use an external CtrnSource signal and the frequency of the signal is less than or equal to one fourth of the maximum...

Страница 21: ...e is always lower than the peak transfer rate Table 2 1 lists the maximum transfer rates for TIO devices Note Transfer rates may vary depending on your computer hardware operating system and system ac...

Страница 22: ...ck Your PXI chassis has a built in 10 MHz backplane clock that is independently routed to each peripheral slot An independent buffer on the chassis drives the clock signal to each peripheral slot with...

Страница 23: ...Hz OCXO 10 MHz Circuit toDrive 10MHz PXI Backplane Clock 80 MHz VCXO Phase Lock Loop 10 MHz PXI Backplane Clock 10 MHz from OCXO is Used as 10 MHz PXI Backplane Clock PXI Backplane PXI CLK10 in Drivin...

Страница 24: ...e first year of normal use For example if the OCXO has a perfect stable frequency of 10 MHz after warm up after the first 10 days of operation the stable frequency drifts 11 25 ppb During the next 50...

Страница 25: ...or injury that results from register level programming the TIO Series devices For information about programming the NI 660x devices at the register level refer to the NI 660X Register Level Programmer...

Страница 26: ...unter 0 Source signal as an output on the I O connector software can turn on the output driver for the PFI 39 CTR 0 SRC pin Caution Do not drive a PFI signal externally when it is configured as an out...

Страница 27: ...lter is sensitive to the duration for which a digital signal transitions from one state to another If a square wave is applied to the filter its propagation will depend on its frequency and duty cycle...

Страница 28: ...lp Power On State The PFI lines are weakly pulled down within the NI TIO ASIC and the RTSI lines are weakly pulled high Connections for pulling up the PFI lines or for stronger pull down connections m...

Страница 29: ...PFI 24 P0 24 CTR 3 OUT D GND PFI 27 P0 27 CTR 3 SOURCE PFI 28 P0 28 CTR 2 OUT D GND PFI 31 P0 31 CTR 2 SOURCE R GND RESERVED RESERVED PFI 37 CTR 0 AUX D GND D GND R GND D GND D GND PFI 1 P0 1 PFI 2 P...

Страница 30: ...GND PFI 19 P0 19 CTR 5 SOURCE CTR 4 OUT PFI 20 P0 20 D GND PFI 23 P0 23 CTR 4 SOURCE PFI 24 P0 24 CTR 3 OUT D GND PFI 27 P0 27 CTR 3 SOURCE PFI 28 P0 28 CTR 2 OUT D GND PFI 31 P0 31 CTR 2 SOURCE R GND...

Страница 31: ...Number Motion Encoder Context 2 channel A 0 3 index z 0 6 channel B 1 7 channel A 1 8 index z 1 17 channel B 7 21 index z 6 22 channel A 6 25 channel A 5 28 channel A 4 31 channel A 3 34 channel A 2 4...

Страница 32: ...ted with the counter When used as such these PFI lines drive the selected GATE or SOURCE associated with these lines For example if PFI 39 is configured as an output it will drive the selected SOURCE...

Страница 33: ...5 PFI 26 P0 26 or CTR 3 GATE PFI 27 P0 27 or CTR 3 SOURCE PFI 28 P0 28 or CTR 2 OUT PFI 29 P0 29 PFI 30 P0 30 or CTR 2 GATE PFI 31 P0 31 or CTR 2 SOURCE PFI 32 CTR 1 OUT PFI 33 Input only PFI 34 CTR 1...

Страница 34: ...I 6608 also have an 80 MHz timebase Each counter has a gate auxiliary and source input Each of these inputs can be an internal or external signal that connects to the I O connector Each counter also h...

Страница 35: ...Minimum Pulse Width and Period for CtrnSource Internal Signals Parameter Minimum Minimum with RTSI Connector Description NI 6601 NI 6602 Tsrcpw without prescaling 5 ns 5 ns 5 ns CtrnSource minimum pu...

Страница 36: ...te When using duplicate count prevention mode the minimum period of signal used as the source of the counter must be greater than or equal to four times the period of the maximum timebase For more inf...

Страница 37: ...fer data from your device to computer memory Counter n Auxiliary Signal You can select any PFI or RTSI as well as many other internal signals as the Counter n Auxiliary CtrnAux signal Much like this C...

Страница 38: ...ates a terminal count when its count value rolls over The two software selectable output options are pulse on TC and toggle output polarity on TC The output polarity is software selectable for both op...

Страница 39: ...rement with Linear and Angular Encoders Pulse Width Measurement Semi Period Measurement Two Edge Separation Measurement Pulse Generation You can perform these measurements through programmed I O inter...

Страница 40: ...onto the RTSI Trigger 7 pin Although some TIO devices have a 80MHzTimebase such as the NI 6602 the RTSI bus cannot carry the 80MHzTimebase signal for bandwidth reasons By default TIO devices do not d...

Страница 41: ...matically within a few seconds after removal of an overcurrent condition The power pin is referenced to the D GND pins and can supply power to external digital circuitry The power rating for this 5V p...

Страница 42: ...h voltage lines High current or high voltage lines that run in parallel paths at a close distance can induce currents in or voltages on the TIO device signal lines To reduce the coupling between lines...

Страница 43: ...the offending line The source impedance of the victim line V1 in the previous example and the level of the offending line V0 Crosstalk is most likely to cause measurement errors when the victim line...

Страница 44: ...re 3 11 shows an example of wiring that minimizes inductive effects Figure 3 11 Example of Wiring That Minimizes Inductive Effects The SH68 68 D1 cable is designed to help minimize inductive effects E...

Страница 45: ...19 PFI 20 27 PFI 21 PFI 22 62 PFI 23 PFI 24 30 PFI 25 PFI 26 65 PFI 27 PFI 28 33 PFI 29 PFI 30 68 PFI 31 PFI 32 42 PFI 33 39 PFI 34 42 PFI 35 41 Table 3 8 Signals and D GND Pin Number on 68 Pin Connec...

Страница 46: ...50 pF respectively For reflection problems that occur when NI 660x devices receives the signal use series termination at the device driving the signal The sum of RS and the output impedance of the sou...

Страница 47: ...ies termination Figure 3 12 Parallel and Series Termination Example 660x Driving Signal Driving Signal Receiving Signal Receiving Signal Parallel Termination Series Termination Other Device 660x Rs RP...

Страница 48: ...NI Applications Engineers via phone and email for one to one technical support as well as exclusive access to self paced online training modules at ni com self paced training All customers automatical...

Страница 49: ...ction for electromagnetic compatibility EMC and product safety You can obtain the DoC for your product by visiting ni com certification Calibration Certificate If your product supports calibration you...

Страница 50: ...resources A 2 diagnostic tools NI resources A 1 digital filter description 3 1 example figure 3 2 pad synchronization 2 2 settings table 3 3 digital I O 2 1 digital synchronization 2 2 DMA 1 1 counter...

Страница 51: ...backplane clock 2 9 using as the SOURCE counter 2 9 outputs 3 7 oven controlled crystal oscillator about 1 1 2 9 calibration 2 11 stable frequency deviation 2 11 using as the 10 MHz PXI backplane cloc...

Страница 52: ...tion for PCI 3 15 signal connection for PXI 3 16 triggers 3 14 3 15 S signals Counter n Auxiliary signal 3 12 Counter n Gate 3 11 Counter n Internal Output 3 13 Counter n Source 3 9 software counter a...

Страница 53: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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