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Chapter 2

Device Overview

©

 National Instruments Corporation

2-3

NI 660x User Manual

This feat

u

re is 

u

sef

u

l in applications with two or more co

u

nters that are 

armed by an external start trigger, or that 

u

se the same PFI line as a co

u

nter 

control signal. Pad synchronization is only 

u

sef

u

l if the co

u

nters involved 

are 

u

sing one of the internal timebases. A co

u

nter is 

u

sing maxim

u

m 

timebase as its so

u

rce if the synchrono

u

s co

u

nting mode is enabled for 

that co

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nter.

Fig

u

res 2-2 and 2-3 ill

u

strate how pad synchronization can be 

u

sef

u

l. 

These fig

u

res ass

u

me a 0.5 and a 0.75 SOURCE cycle delay between the 

PFI 38 inp

u

t pin, and CTR 0 GATE and CTR 1 GATE, respectively. 

Fig

u

re 2-2 shows co

u

nter 0 at the gate edge on PFI 38 one so

u

rce period 

before co

u

nter 1. Fig

u

re 2-3 shows both co

u

nters at the gate edge on PFI 38 

at the same time.

Figure 2-2.  

Counter 0 at Gate Edge on PFI 38 One Source Period before Counter 1

Counter

Source

PFI 38

at CTR 0 GATE

PFI 38

at CTR 1 GATE

Sampled

GATE at Ctr0

Sampled

GATE at Ctr1

1/2 Cycles

1/4 Cycle

PFI 38

at Input To ASIC

Содержание NI 6602

Страница 1: ...DAQ NI 660x User Manual NI 6601 NI 6602 and NI 6608 Devices NI 660x User Manual ni com manuals Deutsch Fran ais December 2009 372119B 01...

Страница 2: ...banon 961 0 1 33 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 328 90 10 Portugal 351 210 311 210 Russia...

Страница 3: ...ng recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation National Instruments respects the intel...

Страница 4: ...e encouraged to try to correct the interference by one or more of the following measures Reorient the antenna of the receiver the device suffering interference Relocate the transmitter the device gene...

Страница 5: ...n 2 2 Duplicate Count Prevention 2 4 Example Application That Works Correctly No Duplicate Counting 2 5 Example Application That Works Incorrectly Duplicate Counting 2 6 Example Application That Preve...

Страница 6: ...ter Out Delay 3 12 Counter n Gate Signal 3 12 Counter n Auxiliary Signal 3 13 Counter n Internal Output Signal 3 14 Hardware Arm Start Triggers 3 14 Counter Pairs 3 15 Counter Applications 3 15 Real T...

Страница 7: ...from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system...

Страница 8: ...ents devices NI DAQmx is the software you use to communicate with and control your DAQ device Measurement Automation Explorer Help for NI DAQmx This help file contains information about configuring an...

Страница 9: ...modes such as event counting time measurement frequency measurement encoder position measurement pulse generation and square wave generation The NI 660x devices contain the National Instruments MITE P...

Страница 10: ...sub bus are disabled by default and never enabled Caution Damage can result if these lines are driven by the sub bus NI is not liable for any damage resulting from improper signal connections Getting...

Страница 11: ...Cables Accessory Description SH68 68 D1 Shielded 68 conductor cable R6868 cable 68 conductor flat ribbon cable BNC 2121 BNC connector block with built in test features CA 1000 Configurable connector...

Страница 12: ...and digital I O can share the lines on PFI 0 31 For 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 abou...

Страница 13: ...everal counters are measuring or operating off the same external signal For example suppose counters 0 and 1 are configured for triggered pulse generation and each counter uses the same external trigg...

Страница 14: ...ting mode is enabled for that counter Figures 2 2 and 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...

Страница 15: ...at are a slow or non periodic external source Duplicate count prevention applies only to buffered counter applications such as measuring frequency or period For such buffered applications the counter...

Страница 16: ...he next rising edge of the Gate the counter stores a 2 because two Source pulses occurred after the previous rising edge of Gate The counter synchronizes or samples the Gate signal with the Source sig...

Страница 17: ...ate signals to the maximum onboard timebase By 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...

Страница 18: ...I DAQmx Help for more information When to Use Duplicate Count Prevention Use duplicate count prevention for buffered measurements that use an external CtrnSource signal and the frequency of the signal...

Страница 19: ...er than interrupt driven transfers NI DAQmx uses DMA by default for buffered acquisitions Note The maximum sustainable transfer rate is always lower than the peak transfer rate Table 2 1 lists the max...

Страница 20: ...port and search using keyword phase lock Using the OCXO as the SOURCE Counter Using the OCXO as the timebase source of the counter you can route the 10 MHz clock to CtrnSource Using the OCXO as the 10...

Страница 21: ...0 NI PXI 6608 in Slot 2 of PXI Chassis 80 MHz Phase Locked to 10 MHz PXI Backplane Clock TIO 1 10 MHz OCXO 10 MHz Circuit toDrive 10MHz PXI Backplane Clock 80 MHz VCXO Phase Lock Loop 10 MHz PXI Backp...

Страница 22: ...table frequency of approximately 45 ppb occurs after the 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 th...

Страница 23: ...n Caution NI is not liable for any damage or injury that results from register level programming the TIO Series devices For information about programming the NI 660x devices at the register level refe...

Страница 24: ...internal timing signal For example if you need the Counter 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...

Страница 25: ...lock and a maximum of two filter clocks The filter 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 propagati...

Страница 26: ...default For more information about using the digital filters on your device refer to the NI DAQmx Help Power On State The PFI lines are weakly pulled down within the NI TIO ASIC and the RTSI lines are...

Страница 27: ...SRC 31 65 D GND D GND 30 64 CTR 3 GATE P0 26 index z 3 PFI 26 PFI 24 P0 24 CTR 3 OUT 29 63 CTR 3 AUX P0 25 channel B 3 PFI 25 PFI 23 channel A 4 P0 23 CTR 4 SRC 28 62 D GND D GND 27 61 CTR 4 GATE P0 2...

Страница 28: ...5 PFI 5 PFI 3 P0 3 12 46 D GND D GND 11 45 P0 2 PFI 2 PFI 0 P0 0 10 44 P0 1 PFI 1 PFI 32 CTR 1 OUT 9 43 RG PFI 34 index z 1 CTR 1 GATE 8 42 D GND PFI 35 channel A 1 CTR 1 SRC 7 41 D GND PFI 33 channel...

Страница 29: ...20 P0 20 D GND PFI 23 P0 23 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 G...

Страница 30: ...TE PFI 15 P0 15 CTR 6 SOURCE CTR 5 OUT PFI 16 P0 16 D 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...

Страница 31: ...sources can be used as outputs associated 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 ou...

Страница 32: ...0 23 or CTR 4 SOURCE1 PFI 24 P0 24 or CTR 3 OUT PFI 25 P0 25 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 C...

Страница 33: ...MHz The counters on the NI 6602 and NI 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...

Страница 34: ...is Tsrcpw ns the low phase must be Tsrcper Tsrcpw Table 3 4 Minimum Pulse Width and Period for CtrnSource Internal Signals Parameter Minimum Minimum with RTSI Connector Description NI 6601 NI 6602 Tsr...

Страница 35: ...block are larger due to cable delays Note 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 peri...

Страница 36: ...nGate signal is determined by how fast the system can transfer 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...

Страница 37: ...unter TC of counter n The counter generates 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 pola...

Страница 38: ...Counter Applications You can use the TIO device in the following counter based applications Counting Edges Frequency Measurement Period Measurement Position Measurement with Linear and Angular Encoder...

Страница 39: ...s in the system For a RTSI connector pinout go to ni com info and enter rtsipin RTSI Triggers TIO devices require a frequency timebase for its operation This frequency timebase must come from the onbo...

Страница 40: ...e phase locking is automatically disabled Additionally PXI trigger line 6 corresponds to PXI star trigger on PXI TIO devices Figure 3 9 shows the RTSI signal connection scheme for PXI TIO devices Figu...

Страница 41: ...rs available on each PFI line to reduce errors that these problems might cause Noise For noise immunity take the following precautions When routing signals to the TIO device keep cabling away from noi...

Страница 42: ...ing The speed of the transition on the offending line PFI 10 in the previous example The length of the cable and the proximity of the victim to the offending line The source impedance of the victim li...

Страница 43: ...ich the PFI line is twisted Figure 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 h...

Страница 44: ...PFI 14 55 PFI 15 55 PFI 16 24 PFI 17 24 PFI 18 59 PFI 19 59 PFI 20 27 PFI 21 17 PFI 22 62 PFI 23 62 PFI 24 30 PFI 25 30 PFI 26 65 PFI 27 65 PFI 28 33 PFI 29 33 PFI 30 68 PFI 31 68 PFI 32 42 PFI 33 39...

Страница 45: ...nded values for RP and CP are 68 and 150 pF respectively For reflection problems that occur when the NI 660x receives the signal use series termination at the device driving the signal The sum of RS a...

Страница 46: ...ser Manual Figure 3 12 shows an example of parallel and series termination Figure 3 12 Parallel and Series Termination Example 660x Driving Signal Driving Signal Receiving Signal Receiving Signal Para...

Страница 47: ...rvice Program Membership This program entitles members to direct access to NI Applications Engineers via phone and email for one to one technical support as well as exclusive access to on demand train...

Страница 48: ...by visiting ni com certification Calibration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com...

Страница 49: ...ols degree negative of or minus per percent plus or minus positive of or plus A A amperes ANSI American National Standards Institute API application programming interface arm To enable a counter to st...

Страница 50: ...ade consecutively and measurement results are stored in a buffer bus The group of conductors that interconnect individual circuitry in a computer Typically a bus is the expansion vehicle to which I O...

Страница 51: ...iming information and general purpose counter timers on National Instruments E Series boards DC direct current decode Used in the context of motion encoders The two channels of a motion encoder indica...

Страница 52: ...andard architecture encode Used in the context of motion encoders Motion encoders provide information about movement and direction of movement of an external device The process of producing the pulses...

Страница 53: ...interrupt A computer signal indicating that the CPU should suspend its current task to service a designated activity interrupt level The relative priority at which a device can interrupt IOH current...

Страница 54: ...enerators transformers fluorescent lights soldering irons CRT displays computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors Noise...

Страница 55: ...ects if you use the SH100 100 S2 shielded cable while they are ground pins if you use the R100100 unshielded ribbon cable ribbon cable A flat cable in which the conductors are side by side ringing The...

Страница 56: ...tops some form of data capture tri state A third output state other than high or low in which the output is undriven TTL transistor transistor logic two pulse encoder A motion encoder that has two cha...

Страница 57: ...al Instruments Corporation G 9 NI 660x User Manual Vin volts in VI Virtual Instrument A LabVIEW program so called because it models the appearance and function of a physical instrument W wire Data pat...

Страница 58: ...8 transfer rates 2 8 Declaration of Conformity NI 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...

Страница 59: ...ration 2 11 stable frequency deviation 2 11 using as the 10 MHz PXI backplane clock 2 9 using as the SOURCE counter 2 9 outputs 3 8 oven controlled crystal oscillator about 1 1 2 9 calibration 2 11 st...

Страница 60: ...te 3 3 PXI compatible products 1 1 signal connection for PCI 3 16 signal connection for PXI 3 17 triggers 3 15 3 16 S signals Counter n Auxiliary signal 3 13 Counter n Gate 3 12 Counter n Internal Out...

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