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Chapter 2

Hardware Overview of the NI 78xxR

National Instruments Corporation

2-13

R Series Multifunction RIO User Manual

line to AIGND, connect it to AIGND thro

gh a resistor that is abo

100 times the eq

ivalent so

rce impedance. The resistor p

ts the signal

path nearly in balance. Abo

t the same amo

nt of noise co

ples onto both

connections, which yields better rejection of electrostatically co

pled

noise. Also, this inp

t mode does not load down the so

rce, other than the

very high-inp

t impedance of the instr

mentation amplifier.

can f

lly balance the signal path by connecting another resistor of the

same val

e between the positive inp

t and AIGND, as shown in Fig

re 2-7.

This f

lly balanced inp

t mode offers slightly better noise rejection b

t has

the disadvantage of loading down the so

rce with the series combination

m) of the two resistors. If, for example, the so

rce impedance is 2 k

and each of the two resistors is 100 k

, the resistors load down the so

rce

with 200 k

and prod

ce a –1% gain error.

Both inp

ts of the instr

mentation amplifier req

ire a DC path to gro

for the instr

mentation amplifier to work. If the so

rce is AC co

pled

(capacitively co

pled), the instr

mentation amplifier needs a resistor

between the positive inp

t and AIGND. If the so

rce has low-impedance,

choose a resistor that is large eno

gh not to significantly load the so

rce b

small eno

gh not to prod

ce significant inp

t offset voltage as a res

lt of

inp

t bias c

rrent, typically 100 k

to 1 M

. In this case, connect the

negative inp

t directly to AIGND. If the so

rce has high o

t impedance,

balance the signal path as previo

sly described

sing the same val

resistor on both the positive and negative inp

ts. Loading down the so

rce

ses some gain error.

Single-Ended Connection Considerations

When an NI 783

R/784

R/785

R AI signal is referenced to a gro

nd that

can be shared with other inp

t signals, it forms a single-ended connection.

The inp

t signal connects to the positive inp

t of the instr

mentation

amplifier and the gro

nd connects to the negative inp

t of the

instr

mentation amplifier.

can

se single-ended inp

t connections for any inp

t signal that meets

the following conditions:

•

The inp

t signal is high-level (>1 V).

•

The leads connecting the signal to the NI 783

R/784

R/785

R are less

than 3 m (10 ft).

•

The inp

t signal can share a common reference point with other

signals.

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Содержание 781 R Series

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Страница 2: ...eries Multifunction RIO User Manual NI 781xR NI 783xR NI 784xR and NI 785xR Devices R Series Multifunction RIO User Manual ni com manuals Deutsch Français Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

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Страница 5: ...ources 1 4 Device Embedded Logic and Processing 1 4 Reconfigurable I O Architecture 1 5 Reconfigurable I O Applications 1 6 Software Development 1 6 LabVIEW FPGA Module 1 6 LabVIEW Real Time Module 1 7 Cables and Accessories 1 8 Custom Cabling 1 9 Chapter 2 Hardware Overview of the NI 78xxR NI 7811R Overview 2 3 NI 7813R Overview 2 3 NI 7830R Overview 2 3 NI 7831R 7833R Overview 2 4 NI 784xR Overv...

Страница 6: ...s 2 16 Analog Output 2 16 Connecting Analog Output Signals 2 17 Digital I O 2 17 Connecting Digital I O Signals 2 17 RTSI Trigger Bus 2 21 PXI Local Bus NI PXI 781xR 783xR Only 2 21 Switch Settings NI 781xR 783xR Only 2 23 5 V Power Source 2 26 Device Fuse Replacement NI 784xR 785xR Only 2 27 PCI Express Device Disk Drive Power Connector 2 28 When to Use the Disk Drive Power Connector 2 28 Disk Dr...

Страница 7: ...nstruments Corporation vii R Series Multifunction RIO User Manual Appendix C Technical Support and Professional Services Glossary Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 8: ...t denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury NI 78xxR NI 781xR 783xR NI 784xR and NI 785xR refer to all PCI PCI Express and PXI R Series devices Related Documentation The following documents contain information that you may find helpful as ...

Страница 9: ...me Module Provides exercises to teach you how to develop a real time project and VIs from setting up RT targets to building debugging and deploying real time applications This document provides references to the LabVIEW Help and other Real Time Module documents for more information as you create the real time application To access this document refer to ni com manuals In LabVIEW 8 0 or later you c...

Страница 10: ...u might find helpful NI Developer Zone tutorial Field Wiring and Noise Considerations for Analog Signals at ni com zone PICMG CompactPCI 2 0 R3 0 PXI Hardware Specification Revision 2 1 PXI Software Specification Revision 2 1 National Instruments Example Finder LabVIEW contains an extensive library of VIs and example programs for use with R Series devices To access the NI Example Finder open LabVI...

Страница 11: ...PGA on the R Series device in LabVIEW using the LabVIEW FPGA Module to create and download a custom virtual Table 1 1 NI 78xxR R Series Multifunction RIO Device Overview Device I O Channels FPGA AI Sample Rate NI PCI PXI 7811R 160 DIO Virtex II XC2V1000 NI PCI PXI 7813R 160 DIO Virtex II XC2V3000 NI PCI PXI 7830R 4 AI 4 AO 56 DIO Virtex II XC2V1000 200 kS s NI PCI PXI 7831R 8 AI 8 AO 96 DIO Virtex...

Страница 12: ...s access the RTSI bus through the PXI trigger lines implemented on the PXI backplane Refer to the NI R Series Multifunction RIO Specifications available at ni com manuals for detailed device specifications Using PXI with CompactPCI Using PXI compatible products with standard CompactPCI products is an important feature provided by PXI Hardware Specification Revision 2 1 and PXI Software Specificati...

Страница 13: ...r 2 Hardware Overview of the NI 78xxR for descriptions of the I O resources on the NI 78xxR Reconfigurable I O Concept R Series Multifunction RIO devices are based on a reconfigurable FPGA core surrounded by fixed I O resources for analog and digital input and output You can configure the behavior of the reconfigurable FPGA to match the requirements of the measurement and control system You can im...

Страница 14: ...ser Defined I O Resources You can create your own custom measurements using the fixed I O resources For example one application might require an event counter that increments when a rising edge appears on any of three digital input lines With an NI 783xR 784xR 785xR R Series device another application might require a digital line to be asserted after an analog input exceeds a programmable threshol...

Страница 15: ...logic provides timing triggering processing and custom I O measurements Each fixed I O resource used by the application uses a small portion of the FPGA logic that controls the fixed I O resource The bus interface also uses a small portion of the FPGA logic to provide software access to the device The remaining FPGA logic is available for higher level functions such as timing triggering and counti...

Страница 16: ...se LabVIEW with the LabVIEW FPGA Module to program the NI 78xxR To develop real time applications that control the NI 78xxR use LabVIEW with the LabVIEW Real Time Module LabVIEW FPGA Module The LabVIEW FPGA Module enables you to use LabVIEW to create VIs that run on the FPGA of the R Series target device Use the FPGA Module VIs and functions to control the I O timing and logic of the R Series devi...

Страница 17: ...p LabVIEW Real Time Module The LabVIEW Real Time Module extends the LabVIEW development environment to deliver deterministic real time performance You can write host VIs that run in Windows or on RT targets to communicate with FPGA VIs that run on the NI 78xxR You can develop real time VIs with LabVIEW and the LabVIEW Real Time Module and then download the VIs to run on a hardware target with a re...

Страница 18: ...formance shielded cable wired specifically for signal connection from the RMIO connector to the NI SCB 68 terminal block to provide higher signal integrity and noise immunity SHC68 68 RDIO NI Recommended 0 1 2 3 1 2 NI SCB 68 High performance shielded cable wired specifically for signal connection from the RDIO connector to the NI SCB 68 terminal block to provide higher signal integrity and noise ...

Страница 19: ...T S connects to the NI 78xxR VHDCI connectors on one end of the cable The other end of the cable is not terminated This cable ships with a wire list identifying the wires that correspond to each NI 78xxR pin You can use this cable to quickly connect the NI 78xxR signals that you need to the connector of your choice Refer to Appendix A Connecting I O Signals for the NI 78xxR connector pinouts Artis...

Страница 20: ...a block diagram for the NI 7831R 7833R 784xR 785xR Figure 2 1 NI 781xR Block Diagram Configuration Configuration Control Connector 0 DIO Connector 1 DIO Connector 2 DIO Connector 3 DIO Digital I O 40 User Configurable FPGA on RIO Devices Digital I O 40 Digital I O 40 Digital I O 40 Data Address Control Bus Interface Address Data Control Flash Memory PCI PXI CompactPCI Bus RTSI PXI Triggers PXI Loc...

Страница 21: ...oltage Reference Temperature Sensor Calibration DACs 2 x4 Channels 16 Bit DAC Digital I O 16 User Configurable FPGA on RIO Devices Bus Interface Data Address Control Control Address Data Flash Memory Configuration Control Configuration PCI PXI CompactPCI Bus 16 Bit ADC Calibration DACs Input Mux Digital I O 40 RTSI Bus x4 Channels Instrumentation Ampliflier AI AI Artisan Technology Group Quality I...

Страница 22: ... you can configure individually for input or output and a Virtex II XC2V1000 FPGA AI AI PCI PXI CompactPCI Bus Input Mux Instrumentation Amplifier Input Mode Mux AISENSE AIGND 16 Bit DAC x8 Channels 2 x8 Channels Configuration Flash Memory User Configurable FPGA on RIO Devices Bus Interface Connector 1 DIO Connector 2 DIO Data Address Control Digital I O 16 Digital I O 40 Digital I O 40 Calibratio...

Страница 23: ...pendent 16 bit AO channels and 96 bidirectional DIO lines that you can configure individually for input or output The NI PXI 7851R has a Virtex 5 LX30 FPGA the NI PXI 7852R has a Virtex 5 LX50 FPGA the NI PXI 7853R has a Virtex 5 LX85 FPGA and the NI PXI 7854R has a Virtex 5 LX110 FPGA Analog Input NI 783xR 784xR 785xR Only You can sample NI 783xR 784xR 785xR AI channels simultaneously or at diffe...

Страница 24: ...nects to the positive terminal of the onboard instrumentation amplifier The negative input pin connects to the negative input of the instrumentation amplifier RSE When the NI 783xR 784xR 785xR is configured in RSE input mode each channel uses only its positive AI pin This pin connects to the positive terminal of the onboard instrumentation amplifier The negative input of the instrumentation amplif...

Страница 25: ...channel In RSE input mode the negative input of the instrumentation amplifier for each channel is internally connected to AIGND In NRSE input mode the AISENSE signal is connected internally to the negative input of the instrumentation amplifier for each channel In DIFF and RSE input modes AISENSE is not used Caution Exceeding the differential and common mode input ranges distorts the input signals...

Страница 26: ...on amplifier The instrumentation amplifier converts two input signals to a signal that is the difference between the two input signals The amplifier output voltage is referenced to the device ground The NI 783xR 784xR 785xR ADC measures this output voltage when it performs A D conversions You must reference all signals to ground either at the source device or at the NI 783xR 784xR 785xR If you hav...

Страница 27: ... the common mode input range Ground Referenced Signal Sources A ground referenced signal source is connected to the building system ground so it is already connected to a common ground point with respect to the NI 783xR 784xR 785xR assuming that the computer is plugged into the same power system Instruments or devices with nonisolated outputs that plug into the building power system are ground ref...

Страница 28: ...und loop losses Vg are added to measured signal NOT RECOMMENDED V1 AI i AI i AIGND i V1 AI i AI i AIGND i See text for information on bias resistors Signal Source Type Floating Signal Source Not Connected to Building Ground Grounded Signal Source Examples Ungrounded Thermocouples Signal Conditioning with Isolated Outputs Battery Devices Examples Plug in Instruments with Nonisolated Outputs Input D...

Страница 29: ...ive input of the instrumentation amplifier Use differential input connections for any channel that meets any of the following conditions The input signal is low level less than 1 V The leads connecting the signal to the NI 783xR 784xR 785xR are greater than 3 m 10 ft The input signal requires a separate ground reference point or return signal The signal leads travel through noisy environments Diff...

Страница 30: ...gnal source and the NI 783xR 784xR 785xR ground shown as Vcm in Figure 2 6 In addition the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to the device The instrumentation amplifier can reject common mode signals when V in and V in input signals are both within their specified input ranges Refer to the NI R Series Multifunction RIO Specific...

Страница 31: ... the instrumentation amplifier and connecting the negative side of the signal to AIGND and to the negative input of the instrumentation amplifier without resistors This connection works well for DC coupled sources with low source impedance less than 100 Ω For larger source impedances this connection leaves the differential signal path significantly out of balance Noise that couples electrostatical...

Страница 32: ...e is AC coupled capacitively coupled the instrumentation amplifier needs a resistor between the positive input and AIGND If the source has low impedance choose a resistor that is large enough not to significantly load the source but small enough not to produce significant input offset voltage as a result of input bias current typically 100 kΩ to 1 MΩ In this case connect the negative input directl...

Страница 33: ... input modes electrostatic and magnetic noise couples into the signal connections more than in differential input modes The coupling is the result of differences in the signal path Magnetic coupling is proportional to the area between the two signal conductors Electrical coupling is a function of how much the electric field differs between the two conductors Single Ended Connections for Floating S...

Страница 34: ...85xR ground and the signal ground appears as a common mode signal at both the positive and negative inputs of the instrumentation amplifier The instrumentation amplifier rejects this difference If the input circuitry of a NI 783xR 784xR 785xR is referenced to ground in RSE input mode this difference in ground potentials appears as an error in the measured voltage Figure 2 9 shows how to connect a ...

Страница 35: ...ut ranges Analog Output The bipolar output range of the NI 783xR 784xR 785xR AO channels is fixed at 10 V Some applications require that the AO channels power on to known voltage levels To set the power on levels you can configure the NI 783xR 784xR 785xR to load and run a VI when the system powers on The VI can set the AO channels to the desired voltage levels The VI interprets data written to th...

Страница 36: ...owers on the DIO lines are at high impedance To set another power on state you can configure the NI 78xxR to load a VI when the system powers on The VI can then set the DIO lines to any power on state Connecting Digital I O Signals The DIO signals on the NI 78xxR RDIO connectors are DGND and DIO 0 39 The DIO signals on the NI 783xR 784xR 785xR RMIO connector are DGND and DIO 0 15 The DIO 0 n signa...

Страница 37: ...lls up the 3 3 V digital output from the NI 78xxR to 5 V CMOS logic levels Refer to the NI R Series Multifunction RIO Specifications available at ni com manuals for detailed DIO specifications Caution Exceeding the maximum input voltage ratings listed in Table A 2 NI 78xxR I O Signal Summary can damage the NI 78xxR and the computer NI is not liable for any damage resulting from such signal connect...

Страница 38: ...tput applications include sending TTL or LVCMOS signals and driving external devices such as the LED shown in Figure 2 11 The NI 78xxR SHC68 68 RDIO cable contains individually shielded bundles that route each digital signal on an individually shielded pair of wires and each signal is twisted with its own wire to digital ground 3 3 V CMOS Use a pull up resistor when driving 5 V CMOS devices LED TT...

Страница 39: ...signals include clock trigger pulse width modulation PWM encoder and counter signals Examples of static signals or non edge sensitive low frequency signals include LEDs switches and relays Table 2 4 summarizes these guidelines Table 2 4 DIO Signal Guidelines for the NI 78xxR Device Digital Lines SH68 C68 S Shielded Cable Signal Pairing Recommended Types of Digital Signals NI 781xR DIO 0 27 DIO lin...

Страница 40: ... on the RTSI bus is connected in parallel to all the other RTSI devices on the bus only one device should drive a particular RTSI trigger line at a time For example if one NI PXI 78xxR is configured to send out a trigger pulse on PXI PXI_Trig0 the remaining devices on that PXI bus segment must have PXI PXI_Trig0 configured as an input Caution Do not drive the same RTSI trigger bus line with the NI...

Страница 41: ...le the local bus lines on an adjacent device if the device drives anything other than 0 3 3V LVTTL signal levels on the NI PXI 781xR 783xR Enabling the lines in this way can damage the NI PXI 781xR 783xR NI is not liable for any damage resulting from enabling such lines The left local bus lines from the left peripheral slot of a PXI backplane Slot 2 are routed to the star trigger lines of up to 13...

Страница 42: ...I PXI 783xR For normal operation SW1 is in the OFF position To prevent a VI stored in Flash memory from loading to the FPGA at power up move SW1 to the ON position as shown in Figure 2 17 Note SW2 and SW3 are not connected 1 Shared Local Bus Lines between Slot 2 and Slot 3 2 Shared Trigger Lines between Slot 2 Slot 3 and Slot 4 3 Shared Local Bus Lines between Slot 3 and Slot 4 Lbr0 Lbr1 Lbr2 Lbr3...

Страница 43: ... 24 ni com Figure 2 13 Switch Location on the NI PCI 781xR Figure 2 14 Switch Location on the NI PXI 781xR SW1 SW2 SW3 NI PXI 7811R Reconfigurable I O CONNECTOR 2 DIO CONNECTOR 3 DIO SW1 SW2 SW3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 44: ...es Multifunction RIO User Manual Figure 2 15 Switch Location on the NI PCI 783xR Figure 2 16 Switch Location on the NI PXI 783xR SW1 SW2 SW3 SW1 SW2 SW3 CONNECTOR 2 DIO NIPXI 7831R ReconfigurableI O Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 45: ...rom Flash memory repeat the previous procedure but return SW1 to the OFF position in step 3 You can use this switch to enable disable the ability to load from Flash memory In addition to this switch you must configure the NI 78xxR with the software to autoload an FPGA VI Note When the NI 781xR 783xR is powered on with SW1 in the ON position the analog circuitry does not return properly calibrated ...

Страница 46: ...the Device Fuse Replacement NI 784xR 785xR Only section Caution Never connect the 5 V power terminals to analog or digital ground or to any other voltage source on the NI 78xxR device or any other device Doing so can damage the device and the computer NI is not liable for damage resulting from such a connection The power rating on most devices is 4 75 to 5 25 VDC at 1 A Refer to the NI R Series Mu...

Страница 47: ...e Power Connector PCI Express R Series devices without the disk drive power connector installed perform identically to other R Series devices for most applications and with most accessories For most applications it is not necessary to install the disk drive power connector However you should install the disk drive power connector in either of the following situations You need more power than liste...

Страница 48: ...computer can vary For example consider using a disk drive power connector that is not in the same power chain as the hard drive Figure 2 19 Connecting to the Disk Drive Power Connector 4 Replace the computer cover and plug in and power on the computer 5 Use the NI 78xxR Calibration Utility to run a self calibration on the NI PCIe 784xR 785xR device Refer to the Self Calibration section of Chapter ...

Страница 49: ...ields or high electromagnetic interference Route signals to the device carefully Keep cabling away from noise sources The most common noise source in a PXI DAQ system is the video monitor Keep the monitor and the analog signals as far apart as possible Use the following recommendations for all signal connections to the NI 783xR 784xR 785xR Separate NI 783xR 784xR 785xR signal lines from high curre...

Страница 50: ...bration Constants The NI 783xR 784xR 785xR is factory calibrated before shipment at approximately 25 C to the levels indicated in the device specifications Refer to the NI R Series Multifunction RIO Specifications available at ni com manuals for more information calibration levels The onboard nonvolatile Flash memory stores the calibration constants for the device Calibration constants are the val...

Страница 51: ...ration is sufficient The Flash memory on the NI 783xR 784xR 785xR stores the results of a self calibration so the CalDACs automatically load with the newly calculated calibration constants the next time the NI 783xR 784xR 785xR is powered on External Calibration An external calibration refers to calibrating your device with a known external reference rather than relying on the onboard reference Th...

Страница 52: ...our device use an external reference several times more accurate than the device itself For more information on externally calibrating your NI 783xR 784xR 785xR device refer to the NI 783xR 784xR 785xR Calibration Procedure for NI RIO found on ni com manuals Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 53: ...ector pin assignments and locations for NI PCI 7811R 7813R and NI PXI 7811R 7813R Figure A 2 shows the I O connector pin assignments and locations for NI PCI 7830R 7831R 7833R NI PCIe 7841R 7842R 7851R 7852R and the NI PXI 7830R 7831R 7833R 7841R 7842R 7851R 7852R 7853R 7854R Note The NI PXI 7830R and NI PCI 7830R do not have Connector 2 RDIO Artisan Technology Group Quality Instrumentation Guaran...

Страница 54: ... DIO20 DIO21 DIO22 DIO23 DIO24 DIO25 DIO26 DIO27 DIO29 DIO30 DIO32 DIO34 DIO36 DIO38 35 1 36 2 37 3 38 4 39 5 40 6 41 7 42 8 43 9 44 10 45 11 46 12 47 13 48 14 49 15 50 16 51 17 52 18 53 19 54 20 55 21 56 22 57 23 58 24 59 25 60 26 61 27 62 28 63 29 64 30 65 31 66 32 67 33 68 34 CONNECTOR 1 RDIO TERMINAL 34 TERMINAL 68 TERMINAL 35 TERMINAL 1 TERMINAL 35 TERMINAL 1 TERMINAL 34 TERMINAL 68 TERMINAL ...

Страница 55: ... 62 28 63 29 64 30 65 31 66 32 67 33 68 34 1No Connect on the NI 7830R DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND 5V 5V DIO28 DIO31 DIO33 DIO35 DIO37 DIO39 DIO0 DIO2 DIO3 DIO5 DIO6 DIO7 DIO8 DIO1 DIO4 DIO9 DIO10 DIO11 DIO12 DIO13 DIO14 DIO15 DIO16 DIO17 DIO18 DIO19 DIO20 DIO21 DIO22 DIO23 DIO24 DIO25 DIO26 DIO27...

Страница 56: ...ments in RSE configuration and the bias current return point for differential measurements All three ground references AIGND AOGND and DGND are connected to each other on the NI 783xR 784xR 785xR AISENSE AIGND Input Analog Input Sense This pin serves as the reference node for AI 0 7 when the device is configured for NRSE mode AO 0 7 AOGND Output Analog Output channels 0 through 7 Each channel can ...

Страница 57: ...A at V Sink mA at V Rise Time Bias 5V DO Analog Signals NI 783xR 784xR 785xR Only AI 0 7 AI 10 GΩ in parallelwith 100 pF 42 35 2 nA AI 0 7 AI 10 GΩ in parallelwith 100 pF 42 35 2 nA AIGND AO AISENSE AI 10 GΩ in parallelwith 100 pF 42 35 2 nA AO 0 7 AO 1 25 Ω Short circuit to ground 2 5 at 10 2 5 at 10 10 V μs AOGND AO Digital Signals All NI 78xxR Devices DIO 0 39 Connector 0 3 NI 781xR DIO 0 15 Co...

Страница 58: ...r 26 pin header contains all the NI 783xR 784xR 785xR analog output signals You can plug this connector directly into a 5B backplane for AO signal conditioning The NI 783xR 784xR 785xR AO 0 n correspond to the 5B backplane channels 0 n in sequential order The 50 pin header contains the 16 DIO lines available on the NI 783xR 784xR 785xR RMIO connector You can plug this header directly into an SSR b...

Страница 59: ...nect No Connect AOGND1 No Connect No Connect AOGND3 No Connect No Connect AOGND5 No Connect No Connect AOGND7 No Connect 2 4 6 8 10 12 14 16 18 20 22 24 26 1 3 5 7 9 11 13 15 17 19 21 23 25 AI0 AIGND0 AI1 AI2 AIGND2 AI3 AI4 AIGND4 AI5 AI6 AIGND6 AI7 AISENSE AI0 AI1 AIGND1 AI2 AI3 AIGND3 AI4 AI5 AIGND5 AI6 AI7 AIGND7 No Connect AI 0 7 Connector Pin Assignment 2 4 6 8 10 12 14 16 18 20 22 24 26 28 3...

Страница 60: ...20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 DIO23 DIO22 DIO21 DIO20 DIO19 DIO18 DIO17 DIO16 DIO15 DIO14 DIO13 DIO12 DIO11 DIO10 DIO9 DIO8 DIO7 DIO6 DIO5 DIO4 DIO3 DIO2 DIO1 DIO0 5V No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect DGND DGND DGND DGND DGND DGND DGND DGND DGND D...

Страница 61: ...onfiguration Figure B 1 General Purpose Switch Configuration for the SCB 68 Terminal Block After configuring the SCB 68 switches you can connect the I O signals to the SCB 68 screw terminals Refer to Appendix A Connecting I O Signals for the connector pin assignments for the NI 78xxR After connecting I O signals to the SCB 68 screw terminals you can connect the SCB 68 to the with the SHC68 68 RMIO...

Страница 62: ...am 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 training modules via the Services Resource Center NI offers complementary membership for a full year after purchase after which you may renew to continue your benefits For information about other technical support options in your area visit...

Страница 63: ...libration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone numbers for our worldwide offices are listed at the front of this manual You also can visit the Worldwide Offices section of ni com nig...

Страница 64: ... m milli 10 3 k kilo 103 M mega 106 G giga 109 Numbers Symbols Degrees Greater than Greater than or equal to Less than Less than or equal to Negative of or minus Ω Ohms Per Percent Plus or minus Positive of or plus Square root of 5V 5 VDC source signal Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 65: ...nal AO Analog output AO i Analog output channel signal AOGND Analog output ground signal B bipolar A signal range that includes both positive and negative values for example 5 to 5 V C C Celsius CalDAC Calibration DAC CH Channel Pin or wire lead to which you apply or from which you read the analog or digital signal Analog signals can be single ended or differential For digital signals you group ch...

Страница 66: ...nalog voltage or current DAQ Data acquisition A system that uses the computer to collect receive and generate electrical signals dB Decibel The unit for expressing a logarithmic measure of the ratio of two signal levels dB 20log10 V1 V2 for signals in volts DC Direct current DGND Digital ground signal DIFF Differential mode DIO Digital input output DIO i Digital input output channel signal DMA Dir...

Страница 67: ...gnal excursion of short duration that is usually unavoidable H h Hour HIL Hardware in the loop Hz Hertz I I O Input output The transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces INL Relative accuracy L LabVIEW Laboratory Virtual Instrument Engineering Workbench LabVIEW is a graphical programming lan...

Страница 68: ...ctrical signal Noise comes from external sources such as the AC power line motors generators transformers fluorescent lights CRT displays computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors Noise corrupts signals you are trying to send or receive NRSE Nonreferenced single ended mode All measurements are made with respect to a ...

Страница 69: ...ds off the CompactPCI specification by adding instrumentation specific features R RAM Random access memory The generic term for the read write memory that is used in computers RAM allows bits and bytes to be written to it as well as read from Various types of RAM are DRAM EDO RAM SRAM and VRAM resolution The smallest signal increment that can be detected by a measurement system Resolution can be e...

Страница 70: ...ion The ratio of the total rms signal due to harmonic distortion to the overall rms signal in decibel or a percentage thermocouple A temperature sensor created by joining two dissimilar metals The junction produces a small voltage as a function of the temperature TTL Transistor transistor logic two s complement Given a number x expressed in base 2 with n digits to the left of the radix point the b...

Страница 71: ...al Instruments Corporation VOH Volts output high VOL Volts output low Vrms Volts root mean square W waveform Multiple voltage readings taken at a specific sampling rate Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

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National Instruments 781 R Series, Руководство пользователя

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Содержание 781 R Series

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