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Chapter 2

Hardware Overview of the NI 78xxR

©

National Instruments Corporation

2-15

R Series Intelligent DAQ User Manual

Single-Ended Connections for Grounded Signal
Sources (NRSE Input Mode)

To measure a grounded signal source with a single-ended input mode, you
must configure the NI 783

x

R/784

x

R/785

x

R in the NRSE input mode. Then

connect the signal to the positive input of the NI 783

x

R/784

x

R/785

x

R

instrumentation amplifier and connect the signal local ground reference to
the negative input of the instrumentation amplifier. The ground point of the
signal should be connected to AISENSE. Any potential difference between
the NI 783

x

R/784

x

R/785

x

R 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 783

x

R/784

x

R/785

x

R 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 grounded signal source to a channel on
the NI 783

x

R/784

x

R/785

x

R configured for NRSE input mode.

Figure 2-9.

Single-Ended Input Connections for Ground-Referenced Signals

–

+

–

+

–

+

–

+

V

cm

V

s

I/O Connector

AISENSE

AIGND

V

m

AI+

AI–

Instrumentation

Amplifier

Measured

Voltage

Ground-

Referenced

Signal

Source

Common-

Mode

Noise and

Ground

Potential

NRSE Input Mode Selected

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Содержание NI PXI-7852

Страница 1: ...PXI 7852 ...

Страница 2: ...Intelligent DAQ NI R Series Intelligent DAQ User Manual NI 781xR 783xR NI 784xR and NI 785xR Devices R Series Intelligent DAQ User Manual June 2008 370489F 01 ...

Страница 3: ...Lebanon 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 3390150 Portugal 351 210 311 210 Russia 7 495 783 6851 Singapore 1800 226 5886 Slovenia 386 3 425 42 00 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 2005151 Taiwan 886 02 2377 2222 Thailand 6...

Страница 4: ...ectronic or mechanical including photocopying 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 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 m...

Страница 5: ...nt of Communications DOC Changes or modifications not expressly approved by NI could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against ha...

Страница 6: ... 4 User Defined I O Resources 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 Safety Information 1 9 Chapter 2 Hardware Overview of the NI 78xxR NI 7811R Overview 2 3 NI 7813R Overview 2 3 NI 7830R Overview ...

Страница 7: ...nded Signal Sources NRSE Input Mode 2 15 Common Mode Signal Rejection Considerations 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 28 Device Fuse Replacement NI 784xR 785xR Only 2 29 Field Wiring Considerat...

Страница 8: ... 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 crash When this symbol is marked on a product refer to the Safety Information section of Chapter 1 Introduction for information about precautions to take When symbol is marked on a product it denotes a warning advising you to...

Страница 9: ...are and software you use for your application you could have any of several types of documentation The documentation includes the following documents Getting Started with R Series Intelligent DAQ This document explains how to install and configure NI 781xR 783xR 784xR 785xR and contains a tutorial that demonstrates how to begin taking a measurement using LabVIEW FPGA This document is available at ...

Страница 10: ...es 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 can also view the LabVIEW Manuals directory that contains this document by selecting Start All Programs National Instruments LabVIEW LabVIEW Manuals Real Time Module book in the LabVIEW Help Select Help ...

Страница 11: ...der LabVIEW contains an extensive library of VIs and example programs for use with R Series devices To access the NI Example Finder open LabVIEW and select Help Find Examples then select Hardware Input and Output R Series LabVIEW FPGA IPNet Offers resources for browsing understanding and downloading LabVIEW FPGA functions or IP Intellectual Property Use this resource to acquire IP that you need fo...

Страница 12: ...of the device You can change the functionality of the FPGA 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 Intelligent DAQ 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 X...

Страница 13: ... connected between devices R Series PXI devices access the RTSI bus through the PXI trigger lines implemented on the PXI backplane Refer to the NI R Series Intelligent DAQ 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 Specificati...

Страница 14: ...l functions in hardware Refer to Chapter 2 Hardware Overview of the NI 78xxR for descriptions of the I O resources on the NI 78xxR Reconfigurable I O Concept R Series Intelligent DAQ 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 meas...

Страница 15: ...pendent timed loops with separate I O resources User 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 a multifunction R Series device another application might require a digital line to be asserted after an ana...

Страница 16: ...ments using the LabVIEW FPGA Module The FPGA 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 f...

Страница 17: ...es of FPGA VIs Software Development You can use 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 ...

Страница 18: ...ional Instruments NI RIO RIO Device Setup Help 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 ...

Страница 19: ... to the NI SCB 68 terminal block to provide higher signal integrity and noise immunity SHC68 68 RDIO NI Recommended 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 immunity SH68 C68 S 0 1 2 NI SCB 68 Basic shielded cable for signal connection from the RMIO or ...

Страница 20: ...amaged in any way If the device is damaged return it to NI for repair Do not substitute parts or modify the device except as described in this document Use the device only with the chassis modules accessories and cables specified in the installation instructions You must have all covers and filler panels installed during operation of the device Do not operate the device in an explosive atmosphere ...

Страница 21: ... a description of installation categories Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS3 voltage This category is for measurements of voltages from specially protected secondary circuits Such voltage measurements include signal levels special equipment limited energy parts of equipment circuits pow...

Страница 22: ...nt in fixed installations distribution boards and circuit breakers Other examples are wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and stationary motors with permanent connections to fixed installations Measurement Category IV is for measurements performed at the primary electrical supply installation 1 000 V Examples include electricity meters ...

Страница 23: ...ck diagram for the NI 7830R Figure 2 3 shows 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...

Страница 24: ...nput Mode Mux AISENSE AIGND Calibration Mux Voltage 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 Amplif...

Страница 25: ...t AO channels 56 bidirectional DIO lines that 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 ...

Страница 26: ...ht independent 16 bit AI channels eight independent 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 Multifunction R Series Only You can sample NI 783xR 784x...

Страница 27: ... uses two AI lines The positive input pin connects 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...

Страница 28: ...ut of the instrumentation amplifier for each 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...

Страница 29: ...tive and negative inputs of the instrumentation 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 dev...

Страница 30: ...put signal varies as the source floats out of 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 ...

Страница 31: ... resistors V1 AI i AIGND i V1 AI Vg AIGND Ground 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...

Страница 32: ...erence signal or return connects to the negative 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...

Страница 33: ...the ground potential difference between the signal 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...

Страница 34: ...e side of the signal to the positive input of 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 ...

Страница 35: ...nstrumentation amplifier to work If the source 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...

Страница 36: ...R 785xR should not supply one In single ended 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 condu...

Страница 37: ...ntial difference between the NI 783xR 784xR 785xR 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 measur...

Страница 38: ...i com manuals for more information about input 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...

Страница 39: ... for either input or output When the system powers 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 conn...

Страница 40: ...ternal pull up resistor to 5 V This resistor pulls up the 3 3 V digital output from the NI 78xxR to 5 V CMOS logic levels Refer to the NI R Series Intelligent DAQ 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 ...

Страница 41: ...of the switch shown in Figure 2 11 Digital output 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 ...

Страница 42: ...Examples of high frequency or edge sensitive 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...

Страница 43: ... 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 TRIG0 the remaining devices on that PXI bus segment must have PXI TRIG0 configured as an input Caution Do not drive the same RTSI trigger bus line with the NI 78xxR and ...

Страница 44: ...t enable 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...

Страница 45: ... of switches on the NI 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 ...

Страница 46: ...Chapter 2 Hardware Overview of the NI 78xxR R Series Intelligent DAQ User Manual 2 24 ni com Figure 2 13 Switch Location on the NI PCI 781xR SW1 SW2 SW3 ...

Страница 47: ...verview of the NI 78xxR National Instruments Corporation 2 25 R Series Intelligent DAQ User Manual Figure 2 14 Switch Location on the NI PXI 781xR NI PXI 7811R Reconfigurable I O CONNECTOR 2 DIO CONNECTOR 3 DIO SW1 SW2 SW3 ...

Страница 48: ...Chapter 2 Hardware Overview of the NI 78xxR R Series Intelligent DAQ User Manual 2 26 ni com Figure 2 15 Switch Location on the NI PCI 783xR SW1 SW2 SW3 ...

Страница 49: ...I PXI 783xR Figure 2 17 Switch Settings Complete the following steps to prevent a VI stored in flash memory from loading to the FPGA 1 Power off and unplug the PXI CompactPCI chassis or PCI computer 2 Remove the NI 781xR 783xR from the PXI CompactPCI chassis or PCI computer SW1 SW2 SW3 1 2 3 ON 1 2 3 ON a Normal Operation Default b Prevent VI From Loading ...

Страница 50: ...1xR 783xR is powered on with SW1 in the ON position the analog circuitry does not return properly calibrated data Move the switch to the ON position only while you are using software to reconfigure the NI 781xR 783xR for the desired power up behavior Afterward return SW1 to the OFF position 5 V Power Source The 5 V terminals on the I O connector supply 5 V referenced to DGND Use these terminals to...

Страница 51: ...ice 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 Intelligent DAQ Specifications document available at ni com manuals to obtain the power rating for your device Device Fuse Replacement NI 784xR 785xR Only NI 784xR 785xR devices have a replaceable fuse ...

Страница 52: ...nual 2 30 ni com 3 Replace the broken fuse while referring to Figure 2 18 for the fuse locations Figure 2 18 NI 784xR 785xR Replacement Fuse Location 4 Reinstall the PCI or PXI device into the computer or PXI chassis 1 Littelfuse Part Number 0453 004 NI Part Number 766247 01 1 ...

Страница 53: ... for signals traveling through areas with large magnetic fields 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 ...

Страница 54: ...most difficult and most accurate Loading Calibration 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 Intelligent DAQ Specifications available at ni com manuals for more information calibration levels The onboard nonvolatile flash memory stores the calibration constants for t...

Страница 55: ...ore a small amount of gain error and self calibration is sufficient The flash memory on the NI 783xR 784xR 785xR stores the results of an internal 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 refer...

Страница 56: ...telligent DAQ User Manual To externally calibrate your 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 Calibration Procedure for NI RIO found on ni com manuals ...

Страница 57: ... to the NI 78xxR I O connectors Figure A 1 shows the I O connector 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 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 ...

Страница 58: ...O12 DIO13 DIO14 DIO15 DIO16 DIO17 DIO18 DIO19 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...

Страница 59: ...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 1 No 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 DI...

Страница 60: ... the reference point for single ended measurements 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 ...

Страница 61: ...Input Output Protection Volts On Off Source mA 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 Device...

Страница 62: ...de when using 5B signal conditioning The other 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 Yo...

Страница 63: ...4 AOGND4 AO5 AO6 AOGND6 AO7 No Connect No Connect 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 Assig...

Страница 64: ... the NSC68 5050 Cable 2 4 6 8 10 12 14 16 18 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 D...

Страница 65: ...o Figure B 1 for the general purpose switch configuration 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 con...

Страница 66: ...andard Service 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 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 ...

Страница 67: ...r product 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 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 visi...

Страница 68: ...ossary Symbol Prefix Value p pico 10 12 n nano 10 9 µ micro 10 6 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 ...

Страница 69: ...analog voltage to a digital number AI Analog input AI i Analog input channel signal AIGND Analog input ground signal AISENSE Analog input sense signal AO Analog output AO i Analog output channel signal AOGND Analog output ground signal ASIC Application Specific Integrated Circuit A proprietary semiconductor component designed and manufactured to perform a set of specific functions B bipolar A sign...

Страница 70: ...mode signal usually expressed in decibels dB common mode voltage Any voltage present at the instrumentation amplifier inputs with respect to amplifier ground CompactPCI Refers to the core specification defined by the PCI Industrial Computer Manufacturer s Group PICMG D D A Digital to analog DAC Digital to analog converter An electronic device often an integrated circuit that converts a digital num...

Страница 71: ...a to from computer memory DNL Differential nonlinearity A measure in LSB of the worst case deviation of code widths from their ideal value of 1 LSB DO Digital output E EEPROM Electrically erasable programmable read only memory ROM that can be erased with an electrical signal and reprogrammed F FPGA Field Programmable Gate Array FPGA VI A configuration that is downloaded to the FPGA and that determ...

Страница 72: ...raphical programming language that uses icons instead of lines of text to create programs LSB Least significant bit M m Meter max Maximum MIMO Multiple input multiple output min Minimum MIO Multifunction I O monotonicity A characteristic of a DAC in which the analog output always increases as the values of the digital code input to it increase mux Multiplexer A switching device with multiple input...

Страница 73: ... vary with respect to the measurement system ground O OUT Output pin A counter output pin where the counter can generate various TTL pulse waveforms P PCI Peripheral Component Interconnect A high performance expansion bus architecture originally developed by Intel to replace ISA and EISA It is achieving widespread acceptance as a standard for PCs and work stations PCI offers a theoretical maximum ...

Страница 74: ...le I O rms Root mean square RSE Referenced single ended mode All measurements are made with respect to a common reference measurement system or a ground Also called a grounded measurement system RTSI Real time system integration bus The timing and triggering bus that connects multiple devices directly This allows for hardware synchronization across devices S s Seconds S Samples S s Samples per sec...

Страница 75: ...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 base 2 number 2n x V V Volts VDC Volts direct current VHDCI Very high density cabled interconnect VI Virtual instrument Program in LabVIEW that models the appearance and function of a physical instrument VIH Volts input high VIL Volts in...

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