NI 9218 Datasheet - National Instruments

1 DATASHEETNI 92182 AI, kS/s/ch Simultaneous, Universal Measurements DSUB or LEMO connectivity Built-in support for accelerometer, powered-sensor, full-bridge, and voltage measurements Support for half-bridge, quarter-bridge, 60 V, and currentmeasurements with adapters 60 VDC, CAT I, channel-to-channel isolationThe NI 9218 is a 2-channel, universal C Series module designed for universal measurementsin NI CompactDAQ and CompactRIO systems. The measurement type is selectable perchannel, allowing you to perform different measurement types on each channel. The NI 9218is ideal for creating universal test systems for automotive, off-highway, and 9218 Kit ContentsNI 9218 with DSUBNI 9218 with LEMO NI 9218 with DSUB NI 9218 Getting Started Guide 2-Position Micro-Fit Plug and CrimpTerminal Kit NI 9218 with LEMO NI 9218 Getting Started Guide Power ConnectorNI 9218 AccessoriesNI 9218 with DSUBNI 9218 with LEMOS crew-Terminal AdapterNI 9982D (Cabled)NI 9982F (Front-Mounted)NI 9982L (Cabled) 20 mA AdapterNI 9983D (Cabled)NI 9983F (Front-Mounted)NI 9983L (Cabled) 60 V AdapterNI 9987D (Cabled)NI 9987F (Front-Mounted)NI 9987L (Cabled)Half-Bridge AdapterNI 9986D (Cabled)NI 9986F (Front-Mounted)NI 9986L (Cabled)120 Quarter-BridgeAdapterNI 9984D (Cabled)NI 9984F (Front-Mounted)NI 9984L (Cabled)350 Quarter-BridgeAdapterNI 9985D (Cabled)

2 NI 9985F (Front-Mounted)NI 9985L (Cabled)Custom CablesNI 9988D Solder CupLEMO PlugPigtail I/O CablesDSUB-to-Pigtail (1 m, 2 m)LEMO-to-Pigtail (1 m, 2 m)Power Connectors2-Pos Micro Fit-to-Pigtail (1m) NI C Series Overview2 | | NI 9218 DatasheetNI provides more than 100 C Series modules for measurement, control, and communicationapplications. C Series modules can connect to any sensor or bus and allow for high-accuracymeasurements that meet the demands of advanced data acquisition and control applications. Measurement-specific signal conditioning that connects to an array of sensors and signals Isolation options such as bank-to-bank, channel-to-channel, and channel-to-earth ground -40 C to 70 C temperature range to meet a variety of application and environmentalneeds Hot-swappableThe majority of C Series modules are supported in both CompactRIO and CompactDAQplatforms and you can move modules from one platform to the other with no combines an open-embedded architecturewith small size, extreme ruggedness, and C Seriesmodules in a platform powered by the NI LabVIEW reconfigurable I/O (RIO) architecture.

3 Each systemcontains an FPGA for custom timing, triggering, andprocessing with a wide array of available modular I/O tomeet any embedded application is a portable, rugged data acquisition platformthat integrates connectivity, data acquisition, and signalconditioning into modular I/O for directly interfacing to anysensor or signal. Using CompactDAQ with LabVIEW, youcan easily customize how you acquire, analyze, visualize,and manage your measurement Professional Development System for Windows Use advanced software tools for large project development Generate code automatically using DAQ Assistant and InstrumentI/O Assistant Use advanced measurement analysis and digital signal processing Take advantage of open connectivity with DLLs, ActiveX,and .NET objects Build DLLs, executables, and MSI installersNI 9218 Datasheet | National Instruments | 3NI LabVIEW FPGA Module Design FPGA applications for NI RIO hardware Program with the same graphical environment used for desktop andreal-time applications Execute control algorithms with loop rates up to 300 MHz Implement custom timing and triggering logic, digital protocols.

4 AndDSP algorithms Incorporate existing HDL code and third-party IP including Xilinx IPgenerator functions Purchase as part of the LabVIEW Embedded Control and MonitoringSuiteNI LabVIEW Real-Time Module Design deterministic real-time applications with LabVIEW graphical programming Download to dedicated NI or third-party hardware for reliableexecution and a wide selection of I/O Take advantage of built-in PID control, signal processing, andanalysis functions Automatically take advantage of multicore CPUs or setprocessor affinity manually Take advantage of real-time OS, development and debuggingsupport, and board support Purchase individually or as part of a LabVIEW suite4 | | NI 9218 DatasheetNI 9218 CircuitryCH0 IsolationIsolationVsupNI 9218 InputConnector PowerConnector ExternalPower SupplyMeasurement TypeSignal Conditioning12 VExcitationIsolatorADCCH1 InputConnector Measurement TypeSignal Conditioning12 VExcitationIsolatorADCH ardware ComponentsSoftware-SelectableExternally Supplied VoltageLegendData Two 24-bit analog -to- digital converters (ADCs) simultaneously sample both AI channels.

5 The NI 9218 provides channel-to-channel isolation. The NI 9218 reconfigures the signal conditioning for each measurement type. The NI 9218 provides excitation for IEPE and bridge completion measurement types. The NI 9218 can provide optional 12 V sensor excitation for 16 V, 65 mV, and 20 mAmeasurement types. 16 V and 65 mV Signal ConditioningAI+AI-ADCA mplifierOvervoltageProtectionPrefilterNI 9218 Input signals on each channel are buffered, conditioned, and then sampled by an 9218 Datasheet | National Instruments | 5 Full-Bridge Signal Conditioning+ ReferenceInputAI+EX+RS+AI EX RS SCSCNI 9218 ADC The analog input connections sense then amplify the incoming analog signal. The excitation connections provide differential bridge-excitation voltage. Remote sensing continuously and automatically corrects for lead-wire induced excitationvoltage loss when using the RS connections.

6 Shunt calibration can be used to correct for lead-wire induced desensitization of Signal Conditioning2 mAIEPEA mplifierandPrefilterAC CouplingNI 9218+ ADCAI+AI- The incoming analog signal is referenced to an isolated ground. Each channel is configured for AC coupling with an IEPE current. Each channel provides a TEDS Class 1 | | NI 9218 Datasheet 20 mA Signal ConditioningAI+DSUB/LEMOAI-ADCA mplifierOvervoltageProtectionCurrentShun tPrefilterNI 9218 The NI 9983 provides a current shunt for the incoming analog signal. 60 V Signal ConditioningAI+DSUB/LEMOAI-ADCA mplifierOvervoltageProtectionPrefilterNI 9218 The NI 9987 provides an attenuator for the incoming analog Signal Conditioning+ ReferenceInputNI 9218 ADCDSUB/LEMOAI+EX+RS+EX RS SCSC The NI 9886 provides half bridge completion resistors for the incoming analog signal.

7 You must connect AI+, EX+, and EX-. RS+ and RS- connections are optional. You do not need to connect the AI- signal because it is connected 9218 Datasheet | National Instruments | 7 Quarter-Bridge Mode Conditioning+ ReferenceInputNI 9218NI 9984/9985 ADCDSUB/LEMOAI+EXCRCThe NI 9984 and NI 9985 provide a quarter-bridge completion resistor and half-bridgecompletion NI 9218 uses a combination of analog and digital filtering to provide an accuraterepresentation of in-band signals while rejecting out-of-band signals. The filters discriminatebetween signals based on the frequency range, or bandwidth, of the signal. The three importantbandwidths to consider are the passband, the stopband, and the alias-free NI 9218 represents signals within the passband, as quantified primarily by passband rippleand phase nonlinearity.

8 All signals that appear in the alias-free bandwidth are either unaliasedsignals or signals that have been filtered by at least the amount of the stopband signals within the passband have frequency-dependent gain or attenuation. The smallamount of variation in gain with respect to frequency is called the passband flatness. Thedigital filters of the NI 9218 adjust the frequency range of the passband to match the data , the amount of gain or attenuation at a given frequency depends on the data filter significantly attenuates all signals above the stopband frequency. The primary goalof the filter is to prevent aliasing. Therefore, the stopband frequency scales precisely with thedata rate. The stopband rejection is the minimum amount of attenuation applied by the filter toall signals with frequencies within the | | NI 9218 DatasheetAlias-Free BandwidthAny signal that appears in the alias-free bandwidth of the NI 9218 is not an aliased artifact ofsignals at a higher frequency.

9 The alias-free bandwidth is defined by the ability of the filter toreject frequencies above the stopband frequency, and it is equal to the data rate minus thestopband 9218 SpecificationsThe following specifications are typical for the range -40 C to 70 C unless otherwise Do not operate the NI 9218 in a manner not specified in this misuse can result in a hazard. You can compromise the safety protectionbuilt into the product if the product is damaged in any way. If the product isdamaged, return it to NI for CharacteristicsNumber of channels2 analog input channelsADC resolution24 bitsType of ADCD elta-SigmaSampling modeSimultaneousTEDS supportNI 9218 with DSUBIEEE TEDS Class 1NI 9218 with LEMOIEEE TEDS Class 1 and TEDS Class 2 Internal master timebase (fM) MHzAccuracy100 ppmFigure 1. data Rates 256 , = 1,2.

10 ,31 data rate range (fs) using internal master kS/sData rate range (fs) using external master timebaseMinimum1 kS/sNI 9218 Datasheet | National Instruments | 9 Overvoltage protectionPin 2 to Pin 3-20 V to 30 VAny other pin-to-pin 30 VNote Be aware when processing acquisitions that include full-scale data . Full-scaledata readings indicate that an over-range has occurred in the analog front-end. 16 V CharacteristicsInput couplingDCMeasurement rangeTypical VMinimum VTable 1. 16 V AccuracyMeasurement ConditionsGain ErrorOffset Error CalibratedTypical, 23 C 5 mVMaximum, -40 C to 70 mVUncalibrated1 Typical, 23 C 5 mVMaximum, -40 C to 70 mVGain drift15 ppm/ COffset drift32 V/ CIntegral non-linearity (INL)150 VInput noise, kS/s128 kS/s107 kS/s81 VInput impedance390 k Input bandwidth, -3 fsFlatness, DC-20 kHz, referred to 1 kHzTypical 30 mdBMaximum 50 mdB1 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modeswhere the calibration constants stored in the module are not applied to the | | NI 9218 DatasheetPhase non-linearity, DC-20 Input delay(40 + [5/512])/fs + fsRejection100 dBAlias-free fsOversample rate64 fsRejection at oversample rate(fs = kS/s)100 dBTotal Harmonic Distortion (THD)