DATASHEET NI 9218 2-Channel, 24-Bit, Dynamic Universal Module • • • • • • • 2 channels, 51.2 kS/s per channel simultaneous sample rate Built-in support for accelerometer, powered sensor, full-bridge, and voltage measurements Support for quarter-bridge, half-bridge, ±60 V, and current measurements through measurement adapters 60 VDC, CAT I, channel-to-channel isolation 10-pin LEMO or 9-pin DSUB connectivity -40 °C to 70 °C operating range, 5 g vibration, 50 g shock 2.8 kHz of bandwidth on the NI 9987 The National Instruments 9218 is a 2-channel, universal C Series module designed for multipurpose measurements in NI CompactDAQ and NI CompactRIO chassis. The NI 9218 supports IEPE accelerometer, full-bridge, ±16 V and ±65 mV measurements and provides a 12 V regulated supply for powered sensors. When using a measurement adapter, the NI 9218 supports quarter-bridge, half-bridge, ±20 mA, and ±60 V measurements. The measurement type is selectable per channel, allowing you to perform different measurement types on each channel. The NI 9218 is ideal for creating universal test systems for automotive, off-highway, and data-logging systems. Kit Contents Recommended Accessories Optional Accessories • NI 9218 • NI 9218 Getting Started Guide • Crimp & Plug Kit • NI 9982D/L Screw-Terminal Adapter • LEMO Plug-to-Pigtail Cable 1 m • LEMO Plug-to-Pigtail Cable 2 m • LEMO Plug for Custom Cable • Extra Power Connectors (for LEMO) • DSUB-to-Pigtail Cable 1 m • DSUB-to-Pigtail Cable 2 m • 2-Position Micro-Fit to Pigtail Power Cable (for DSUB) • NI 9988D Solder Cup Connector Adapter (Qty 2) • NI9983D/L Current Shunt Adapter ±20 mA • NI9984D/L Quarter-Bridge 120 Ω Adapter • NI9985D/L Quarter-Bridge 350 Ω Adapter • NI9986D/L Half-Bridge Completion Adapter • NI9987D/L ±60 V Attenuator Adapter NI C Series Overview NI provides more than 100 C Series modules for measurement, control, and communication applications. C Series modules can connect to any sensor or bus and allow for high-accuracy measurements 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 environmental needs • Hot-swappable The majority of C Series modules are supported in both CompactRIO and CompactDAQ platforms and you can move modules from one platform to the other with no modification. 2 | ni.com | NI 9218 Datasheet CompactRIO CompactRIO combines an open-embedded architecture with small size, extreme ruggedness, and C Series modules in a platform powered by the NI LabVIEW reconfigurable I/O (RIO) architecture. Each system contains an FPGA for custom timing, triggering, and processing with a wide array of available modular I/O to meet any embedded application requirement. CompactDAQ CompactDAQ is a portable, rugged data acquisition platform that integrates connectivity, data acquisition, and signal conditioning into modular I/O for directly interfacing to any sensor or signal. Using CompactDAQ with LabVIEW, you can easily customize how you acquire, analyze, visualize, and manage your measurement data. Software LabVIEW Professional Development System for Windows • • • • • Use advanced software tools for large project development Generate code automatically using DAQ Assistant and Instrument I/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 installers NI LabVIEW FPGA Module • • • • • • Design FPGA applications for NI RIO hardware Program with the same graphical environment used for desktop and real-time applications Execute control algorithms with loop rates up to 300 MHz Implement custom timing and triggering logic, digital protocols, and DSP algorithms Incorporate existing HDL code and third-party IP including Xilinx IP generator functions Purchase as part of the LabVIEW Embedded Control and Monitoring Suite NI 9218 Datasheet | © National Instruments | 3 NI LabVIEW Real-Time Module • Design deterministic real-time applications with LabVIEW graphical programming Download to dedicated NI or third-party hardware for reliable execution and a wide selection of I/O Take advantage of built-in PID control, signal processing, and analysis functions Automatically take advantage of multicore CPUs or set processor affinity manually Take advantage of real-time OS, development and debugging support, and board support Purchase individually or as part of a LabVIEW suite • • • • • Circuitry The NI 9218 provides channel-to-channel isolation. Two 24-bit analog-to-digital converters (ADCs) simultaneously sample both analog input channels. The NI 9218 reconfigures the signal conditioning for each mode. The NI 9218 provides excitation for ±5 V IEPE and ±22 mV/V bridge modes. Additionally, the NI 9218 can provide optional +12 V sensor excitation for ±16 V, ±65 mV, and ±20 mA modes. Input Connector Figure 1. NI 9218 Circuitry Mode Specific Signal Conditioning 12 V Excitation CH0 Input Connector Isolator Mode Specific Signal Conditioning CH1 Isolator 12 V Excitation External Power Supply VSUP NI 9218 ±16 V Mode and ±65 mV Mode Signal Conditioning In ±16 V and ±65 mV modes, the incoming analog signal is buffered and conditioned. 4 | ni.com | NI 9218 Datasheet Figure 2. ±16 V Mode and ±65 mV Mode Signal Conditioning AI+ AI– Overvoltage Protection NI 9218 Full-Bridge Mode Signal Conditioning In ±22 mV/V full-bridge mode, 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 excitation voltage loss when using the RS connections. Shunt calibration can be used to correct for lead-wire induced desensitization of the bridge. Figure 3. Full-Bridge Mode Signal Conditioning RS+ EX+ AI+ Reference + – Input AI– EX– RS– SC SC NI 9218 ±5 V IEPE Mode Signal Conditioning In ±5 V IEPE mode, the incoming analog signal is referenced to an isolated ground. Each channel is configured for AC coupling with an IEPE current and provides a TEDS Class 1 interface. Figure 4. ±5 V IEPE Mode Signal Conditioning 2 mA IEPE AI+ AC Coupling AI– NI 9218 ±20 mA Mode Signal Conditioning In ±20 mA mode, the NI 9983 provides a current shunt for the incoming analog signal. NI 9218 Datasheet | © National Instruments | 5 Figure 5. ±20 mA Mode Signal Conditioning AI+ Current Shunt AI– Overvoltage Protection NI 9983 NI 9218 ±60 V Mode Signal Conditioning In ±60 V mode, the NI 9987 provides an attenuator for the incoming analog signal. Figure 6. ±60 V Mode Signal Conditioning AI+ Overvoltage Protection AI– NI 9987 NI 9218 Half-Bridge Mode Signal Conditioning The NI 9886 provides half bridge completion resistors when connected to the NI 9218. When you connect a half bridge to the NI 9218, you must connect the AI+, EX+, and EX-, and have the option of RS+ and RS- signals. However, you do not need to connect the AI- signal because it is connected internally. Figure 7. Half-Bridge Mode Signal Conditioning RS+ Reference EX+ + – Input AI+ EX– RS– SC SC NI 9986 NI 9218 Quarter-Bridge Mode Signal Conditioning The NI 9984 and NI 9985 provide a quarter-bridge completion resistor and half-bridge completion resistors. 6 | ni.com | NI 9218 Datasheet Figure 8. Quarter-Bridge Mode Signal Conditioning Reference EXC AI RC + – Input NI 9984/9985 NI 9218 TEDS Class I & II TEDS Class I & II TEDS Support Class I Class II 9218 with LEMO 9218 with DSUB 9982 LEMO DSUB 9983 LEMO DSUB 9984 LEMO DSUB 9986 LEMO DSUB 9987 LEMO DSUB Filtering The NI 9218 uses a combination of analog and digital filtering to provide an accurate representation of in-band signals while rejecting out-of-band signals. The filters discriminate between signals based on the frequency range, or bandwidth, of the signal. The three important bandwidths to consider are the passband, the stopband, and the alias-free bandwidth. The NI 9218 represents signals within the passband, as quantified primarily by passband ripple and phase nonlinearity. All signals that appear in the alias-free bandwidth are either unaliased signals or signals that have been filtered by at least the amount of the stopband rejection. Passband The signals within the passband have frequency-dependent gain or attenuation. The small amount of variation in gain with respect to frequency is called the passband flatness. The digital filters of the NI 9218 adjust the frequency range of the passband to match the data rate. Therefore, the amount of gain or attenuation at a given frequency depends on the data rate. NI 9218 Datasheet | © National Instruments | 7 Stopband The filter significantly attenuates all signals above the stopband frequency. The primary goal of the filter is to prevent aliasing. Therefore, the stopband frequency scales precisely with the data rate. The stopband rejection is the minimum amount of attenuation applied by the filter to all signals with frequencies within the stopband. Alias-Free Bandwidth Any signal that appears in the alias-free bandwidth of the NI 9218 is not an aliased artifact of signals at a higher frequency. The alias-free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency, and it is equal to the data rate minus the stopband frequency. Creating Custom Cables If you are using the NI 9988 solder cup connector adapter or the LEMO crimp connector (784162-01), you must use a shielded cable for all signals, connect the cable shield to earth ground, and use twisted-pair wiring for the AI+/AI- and RS+/RS- signals to achieve specified EMC performance. Figure 9. Cabling to Minimize Noise Shield AI+ AI+ AI– AI- RS+ RS+ RS– RS– Additional Signals Additional Signals Sensor/ Device NI 9988 NI 9218 Note To use ±20 mA mode, ±60 V mode, half-bridge mode, or quarter-bridge mode on the NI 9218, you must use the appropriate NI measurement adapter. Specifications The following specifications are typical for the range -40 °C to 70 °C unless otherwise noted. Caution To ensure the specified EMC performance, operate this product only with shielded cables and accessories. Caution Do not operate the NI 9218 in a manner not specified in this document. Product misuse can result in a hazard. You can compromise the safety protection 8 | ni.com | NI 9218 Datasheet built into the product if the product is damaged in any way. If the product is damaged, return it to NI for repair. General Characteristics ............................................................................ Number of channels 2 analog input channels ADC resolution ............................................................................ 24 bits Type of ADC ............................................................................ Delta-Sigma Sampling mode ............................................................................ Simultaneous Type of TEDS supported ............................................................................ IEEE 1451.4 TEDS Class 1 & 2 (Class 2 supported by LEMO only) Internal master timebase (fM) .................................................................... Frequency 13.1072 MHz Accuracy .................................................................... 100 ppm Data rates �� ÷ 256 � , � = 1, 2, ..., 31 Data rate range (fs) using internal master timebase Minimum ....................................................................1.652 kS/s Maximum .................................................................... 51.2 kS/s Data rate range (fs) using external master timebase .................................................................... Minimum 1 kS/s Maximum .................................................................... 51.367 kS/s Overvoltage protection Pin 2 to Pin 3 .................................................................... -20 V to 30 V Any other pin-to-pin .................................................................... ±30 V Note Be aware when processing acquisitions that include full-scale data. Full-scale data readings indicate that an over-range has occurred in the analog front-end. ±16 V Mode Characteristics Input ............................................................................ coupling DC Measurement range Typical .................................................................... ±16.3 V Minimum .................................................................... ±16.0 V NI 9218 Datasheet | © National Instruments | 9 Table 1. ±16 V Mode Accuracy Measurement Conditions Calibrated Uncalibrated1 Gain Error Offset Error Typical, 23 °C ±5 °C 0.08% 0.70 mV Maximum, -40 °C to 70 °C 0.20% 9 mV Typical, 23 °C ±5 °C 1.2% 50 mV Maximum, -40 °C to 70 °C 2.0% 70 mV Gain drift ............................................................................ 15 ppm/°C Offset drift ............................................................................ 32 μV/°C Integral non-linearity (INL) ............................................................................ 150 μV Input noise, RMS 51.2 kS/s .................................................................... 128 μV 25.6 kS/s .................................................................... 107 μV 4.27 kS/s .................................................................... 81 μV Input impedance ............................................................................ 390 kΩ Input bandwidth, -3 dB ............................................................................ 0.49 fs Flatness, DC-20 kHz, referred to 1 kHz .................................................................... Typical ±30 mdB Maximum .................................................................... ±50 mdB Phase non-linearity, DC-20 kHz ............................................................................ 0.30° Input delay ............................................................................ (40 + [5/512])/fs + 5.3 μs Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -100 dBc 1 kHz, -1 dBFS 1 10 | Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. ni.com | NI 9218 Datasheet ............................................................................ Spurious-Free Dynamic Range 101 dB (SFDR), 1 kHz, 1 Vrms Crosstalk .................................................................... 60 Hz, 1 Vrms, common mode -120 dBFS 1 kHz normal mode, full-scale .................................................................... -109 dBFS aggressor ............................................................................ CMRR, 60 Hz -120 dBFS 1 Vrms-to-earth ground Powered sensor 12 V excitation Voltage .................................................................... level 12 V ±5% Voltage noise, RMS .................................................................... 1 mV 100 kHz bandwidth Output current Typical ............................................................ 50.5 mA Minimum ............................................................ 46.5 mA Settling Time (to 1 % of final .................................................................... 200 ms value after enabling) Related Information VSUP Power Requirements on page 24 ±65 mV Mode Characteristics ............................................................................ Input coupling DC Measurement range Typical .................................................................... 73.5 mV Minimum .................................................................... 72 mV Table 2. ±65 mV Mode Accuracy Measurement Conditions Calibrated Gain Error Offset Error Typical, 23 °C ±5 °C 0.13% 8 μV Maximum, -40 °C to 70 °C 0.20% 130 μV NI 9218 Datasheet | © National Instruments | 11 Table 2. ±65 mV Mode Accuracy (Continued) Measurement Conditions Uncalibrated2 Gain Error Offset Error Typical, 23 °C ±5 °C 1.2% 300 μV Maximum, -40 °C to 70 °C 2.0% 450 μV Gain drift ............................................................................ 10 ppm/°C Offset drift ............................................................................ 320 nV/°C Input noise, RMS 51.2 kS/s .................................................................... 4.3 μV 25.6 kS/s .................................................................... 3 μV 4.27 kS/s .................................................................... 1.3 μV Input impedance ............................................................................ >10 MΩ Input bandwidth, -3dB ............................................................................ 0.49 fs Flatness, DC-20 kHz, referred to 1 kHz .................................................................... Typical -40 mdB to 0 mdB Maximum .................................................................... -150 mdB to 20 mdB Phase non-linearity, DC-20 kHz ............................................................................ 0.2° Input delay ............................................................................ (40 + [5/512])/fs + 3.9 μs Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -95 dBc 1 kHz, -1 dBFS Spurious-Free ............................................................................ Dynamic Range 95 dB (SFDR), 1 kHz, -1 dBFS 2 12 | Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. ni.com | NI 9218 Datasheet Crosstalk 60 Hz, 1 Vrms, common mode .................................................................... -120 dBFS 1 kHz normal mode, full-scale .................................................................... -109 dBFS aggressor ............................................................................ CMRR, 60 Hz, -133 dBFS 1 Vrms-to-earth ground Powered sensor 12 V excitation Voltage .................................................................... level 12 V ±5% Voltage noise, RMS .................................................................... 1 mV 100 kHz bandwidth Output current Typical ............................................................ 50.5 mA Minimum ............................................................ 46.5 mA Settling Time (to 1% of final .................................................................... 200 ms value after enabling) Related Information VSUP Power Requirements on page 24 Full-Bridge Mode Characteristics ............................................................................ Input coupling DC Measurement range Typical .................................................................... 22.1 mV/V Minimum .................................................................... 21.7 mV/V Table 3. Full-Bridge Mode Accuracy Offset Calibrated Gain Without Offset Null ≤ 90 days, ±5 °C from Offset Null 3.3 V excitation Typical, 23 ±5 °C 0.10% 2.4 μV/V 0.5 μV/V Maximum -40 °C to 70 °C 0.20% 40 μV/V 5 μV/V Typical 23 ±5 °C 0.10% 30 μV /V 0.8 μV/V Maximum -40 °C to 70 °C 0.20% 87 μV/V 8 μV/V 2 V excitation NI 9218 Datasheet | © National Instruments | 13 Table 3. Full-Bridge Mode Accuracy (Continued) Offset Gain Without Offset Null ≤ 90 days, ±5 °C from Offset Null Uncalibrated3 3.3 V excitation Typical, 23 ±5 °C 1.2% 100 μV/V — Maximum -40 °C to 70 °C 2.0% 150 μV/V — Typical 23 ±5 °C 1.2% 120 μV/V — Maximum -40 °C to 70 °C 2.0% 200 μV/V — 2 V excitation Gain drift ............................................................................ 10 ppm/°C Offset drift 3.3 V excitation .................................................................... 100 nV/V/°C 2 V excitation .................................................................... 160 nV/V/°C Table 4. Input Noise, RMS Excitation Voltage Sample Rate 4.27 kS/s 25.6 kS/s 51.2 kS/s 3.3 V 0.4 μV/V 1.0 μV/V 1.3 μV/V 2V 0.7 μV/V 1.6 μV/V 2.1 μV/V Differential input impedance ............................................................................ >10 MΩ Input ............................................................................ bandwidth, -3 dB 0.49 fs Flatness, DC-20 kHz, referred to 1 kHz .................................................................... Typical -40 mdB to 0 mdB Maximum .................................................................... -150 mdB to 20 mdB Phase non-linearity, DC-20 kHz ............................................................................ 0.2° Input delay ............................................................................ (40 + [5/512])/fs + 3.9 μs 3 14 | Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. ni.com | NI 9218 Datasheet Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -95 dBc 1 kHz, -1 dBFS Spurious-Free ............................................................................ Dynamic Range 95 dB (SFDR), 1 kHz, -1 dBFS Crosstalk 60 .................................................................... Hz, 1 Vrms, common mode -120 dBFS 1 kHz, normal mode, full-scale .................................................................... -109 dBFS aggressor ............................................................................ CMRR, 60 Hz, -133 dBFS 1 Vrms-to-earth ground Shunt calibration accuracy ............................................................................ 50 kΩ ±0.2% Strain excitation voltage 2 V level .................................................................... 2 V ±3% 3.3 V level .................................................................... 3.3 V ±3% Output current 2 V level .................................................................... 17.8 mA 3.3 V level .................................................................... 10.1 mA ±5 V IEPE Mode Characteristics Input ............................................................................ coupling AC Measurement range Typical .................................................................... 5.33 V Minimum .................................................................... 5.0 V NI 9218 Datasheet | © National Instruments | 15 Table 5. ±5 V IEPE Mode Accuracy Measurement Conditions Calibrated Uncalibrated4 Gain Error Typical, 23 °C ±5 °C 0.20% (0.017 dB) Maximum, -40 °C to 70 °C 0.40% (0.034 dB) Typical, 23 °C ±5 °C 1.7% (0.146 dB) Maximum, -40 °C to 70 °C 2.0% (0.172 dB) Gain drift ............................................................................ 25 ppm/°C Input noise, RMS 51.2 kS/S .................................................................... 50 μV 25.6 kS/s .................................................................... 38 μV 4.27 kS/s .................................................................... 25 μV Input impedance ............................................................................ 300 kΩ Input bandwidth, -3 dB ............................................................................ 0.49 fs Flatness, 10 Hz-20 kHz, referred to 1 kHz .................................................................... Typical ±25 mdB Maximum .................................................................... ±40 mdB Phase non-linearity, 100 Hz-20 kHz ............................................................................ 0.25° AC ............................................................................ cutoff frequency, -3 dB 0.5 Hz Input delay ............................................................................ (40 + [5/512])/fs + 3.9 μs Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -102 dBc 1 kHz, -1 dBFS 4 16 | Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. ni.com | NI 9218 Datasheet ............................................................................ Spurious-Free Dynamic Range 107 dB (SFDR), 1 kHz, 1 Vrms ............................................................................ Intermodulation Distortion (IMD), -97 dB (CCIF 11 kHz/12 kHz) Crosstalk 60 Hz, 1 Vrms, common mode .................................................................... -120 dBFS 1 kHz normal mode, full-scale .................................................................... -109 dBFS aggressor ............................................................................ CMRR, 60 Hz, -122 dBFS 1 Vrms-to-earth ground IEPE excitation current Typical .................................................................... 2.2 mA Minimum .................................................................... 2.1 mA Compliance voltage Typical .................................................................... 20.5 V Minimum .................................................................... 19.5 V If you are using an IEPE sensor, use the following equation to make sure your configuration meets the IEPE compliance voltage range. (Vbias ± Vfull-scale) must be 0 to 19.5 where Vbias is the bias voltage of the IEPE sensor Vfull-scale is the full-scale voltage of the IEPE sensor ±20 mA Mode Characteristics ±20 mA mode requires the NI 9983 measurement adapter. ±20 mA mode characteristics apply when using the NI 9218 in conjunction with the NI 9983. Input ............................................................................ coupling DC Measurement range Typical .................................................................... 24.4 mA Minimum .................................................................... 23.0 mA NI 9218 Datasheet | © National Instruments | 17 Table 6. ±20 mA Mode Accuracy Measurement Conditions Calibrated Uncalibrated5 Gain Error Offset Error Typical, 23 °C ±5 °C 0.40% 5 μA Maximum, -40 °C to 70 °C 0.60% 42 μA Typical, 23 °C ±5 °C 1.5% 100 μA Maximum, -40 °C to 70 °C 2.0% 150 μA Gain drift ............................................................................ 35 ppm/°C Offset drift ............................................................................ 105 nA/°C Shunt resistance ............................................................................ 3.01 Ω Input noise, RMS 51.2 kS/S .................................................................... 1.4 μA 25.6 kS/s .................................................................... 1.0 μA 4.27 kS/s .................................................................... 0.5 μA Input impedance ............................................................................ 45 Ω ±30% Input bandwidth, -3 dB ............................................................................ 0.49 fs ............................................................................ Input delay (40 + [5/512])/fs + 3.9 μs Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) Crosstalk .................................................................... 60 Hz, 1 Vrms, common mode -120 dBFS 1 kHz normal mode, full-scale .................................................................... -109 dBFS aggressor ............................................................................ CMRR, 60 Hz, -99 dBFS 1 Vrms-to-earth ground 5 18 | Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. ni.com | NI 9218 Datasheet Powered sensor 12 V excitation Voltage level .................................................................... 12 V ±5% Voltage noise, RMS, .................................................................... 1 mV 100 kHz bandwidth Output current Typical ............................................................ 50.5 mA Minimum ............................................................ 46.5 mA Settling Time (to 1% of final .................................................................... 200 ms value after enabling) Related Information VSUP Power Requirements on page 24 ±60 V Mode Characteristics ±60 V mode requires the NI 9987 measurement adapter. ±60 V mode characteristics apply when using the NI 9218 in conjunction with the NI 9987. Input ............................................................................ coupling DC Measurement range Typical .................................................................... ±62.1 V Minimum .................................................................... ±60 V Table 7. ±60 V Mode Accuracy Measurement Conditions Calibrated Uncalibrated6 Gain Error Offset Error Typical, 23 °C ±5 °C 0.3% 3 mV Maximum, -40 °C to 70 °C 0.6% 40 mV Typical, 23 °C ±5 °C 1.3% 200 mV Maximum, -40 °C to 70 °C 2.0% 300 mV Gain drift ............................................................................ 30 ppm/°C Offset drift ............................................................................ 120 μV/°C Integral non-linearity (INL) ............................................................................ 15 mV 6 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. NI 9218 Datasheet | © National Instruments | 19 Input noise, RMS 51.2 kS/S .................................................................... 500 μV 25.6 kS/s .................................................................... 420 μV 4.27 kS/s .................................................................... 320 μV Input impedance ............................................................................ 1.49 MΩ Input bandwidth, -3 dB, 9987D/L ............................................................................ Lesser of 2.8 kHz or 0.49 fs ............................................................................ Flatness, DC to 500 Hz, 0.2 dB referred to DC, fs ≥ 1.652 kS/s Input delay 9987D ....................................................................(40 + [5/512])/fs + 58.7 μs 9987L .................................................................... (40 + [5/512])/fs + 57.9 μs Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -80 dBc 8 Vrms, 500 Hz Spurious-Free ............................................................................ Dynamic Range -80 dB (SFDR), 8 Vrms, 500 Hz Crosstalk .................................................................... 60 Hz, 1 Vrms, common mode -120 dBFS 1 kHz, normal mode, full-scale .................................................................... -70 dBFS aggressor ............................................................................ CMRR, 60 Hz, -89 dBFS 1 Vrms-to-earth ground Half-Bridge Mode Characteristics Half-bridge mode requires the NI 9986 measurement adapter. Half-bridge mode characteristics apply when using the NI 9218 in conjunction with the NI 9986. ............................................................................ Input coupling DC 20 | ni.com | NI 9218 Datasheet Measurement range Typical .................................................................... 22.1 mV/V Minimum .................................................................... 21.7 mV/V Table 8. Half-Bridge Mode Accuracy Offset Calibrated Gain Without Offset Null ≤ 90 days, ±5 °C from Offset Null 0.10% 700 μV/V 45 μV/V 3.3 V and 2 V excitation Typical 23 ±5 °C Maximum -40 °C 0.20% to 70 °C 1000 μV/V 90 μV/V Uncalibrated7 3.3 V and 2 V excitation Typical 23 ±5 °C 1.2% 800 μV/V — Maximum -40 °C to 70 °C 2.0% 1.1 mV/V — Gain drift ............................................................................ 10 ppm/°C Offset drift ............................................................................ 1.3 μV/V/°C Table 9. Input Noise, RMS Excitation Voltage Sample Rate 4.27 kS/s 25.6 kS/s 51.2 kS/s 3.3 V 0.4 μV/V 1.0 μV/V 1.3 μV/V 2V 0.7 μV/V 1.6 μV/V 2.2 μV/V Input bandwidth, -3 dB ............................................................................ 0.49 fs Flatness, DC-20 kHz, referred to 1 kHz .................................................................... Typical -40 mdB to 0 mdB Maximum .................................................................... -150 mdB to 20 mdB Phase non-linearity, DC-20 kHz ............................................................................ 0.2° Input delay ............................................................................ (40 + [5/512])/fs + 3.9 μs 7 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. NI 9218 Datasheet | © National Instruments | 21 Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -95 dBc 1 kHz, -1 dBFS Spurious-Free ............................................................................ Dynamic Range 95 dB (SFDR), 1 kHz, -1 dBFS Crosstalk 60 .................................................................... Hz, 1 Vrms, common mode -120 dBFS 1 kHz, normal mode, full-scale .................................................................... -85 dBFS aggressor ............................................................................ CMRR, 60 Hz, -73 dBFS 1 Vrms-to-earth ground Strain excitation voltage 2 V level .................................................................... 2 V ±3% 3.3 V level .................................................................... 3.3 V ±3% Output current 2 V level .................................................................... 17.8 mA 3.3 V level .................................................................... 10.1 mA Quarter-Bridge Mode Characteristics Quarter-bridge mode requires the NI 9984/9985 measurement adapter. Quarter-bridge mode characteristics apply when using the NI 9218 in conjunction with the NI 9984/9985. ............................................................................ Input coupling DC Measurement range Typical .................................................................... 22.1 mV/V Minimum .................................................................... 21.7 mV/V 22 | ni.com | NI 9218 Datasheet Table 10. Quarter-Bridge Mode Accuracy Offset Calibrated Gain Without Offset Null ≤ 90 days, ±5 °C from Offset Null 0.10% 700 μV/V 45 μV/V 3.3 V and 2 V excitation Typical 23 ±5 °C Maximum -40 °C 0.20% to 70 °C 1000 μV/V 90 μV/V Uncalibrated8 3.3 V and 2 V excitation Typical 23 ±5 °C 1.2% 800 μV/V — Maximum -40 °C to 70 °C 2.0% 1.1 mV/V — Gain drift ............................................................................ 10 ppm/°C Offset drift ............................................................................ 1.3 μV/V/°C Quarter-bridge completion resistance 9984 .................................................................... 120 Ω 9985 .................................................................... 350 Ω Table 11. Input Noise, RMS Excitation Voltage Sample Rate 4.27 kS/s 25.6 kS/s 51.2 kS/s 350 Ω, 3.3 V 0.4 μV/V 1.0 μV/V 1.3 μV/V 120 Ω, 2 V 0.7 μV/V 1.6 μV/V 2.2 μV/V Input bandwidth, -3dB ............................................................................ 0.49 fs Flatness, DC-20 kHz, referred to 1 kHz .................................................................... Typical -40 mdB to 0 mdB Maximum .................................................................... -150 mdB to 20 mdB Phase non-linearity, DC-20 kHz ............................................................................ 0.2° Input delay ............................................................................ (40 + [5/512])/fs + 3.9 μs 8 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. NI 9218 Datasheet | © National Instruments | 23 Stopband Frequency .................................................................... 0.55 fs .................................................................... Rejection 100 dB Alias-free bandwidth ............................................................................ 0.45 fs ............................................................................ Oversample rate 64 fs ............................................................................ Rejection at oversample rate 100 dB (fs = 51.2 kS/s) ............................................................................ Total Harmonic Distortion (THD), -95 dBc 1 kHz, -1 dBFS Spurious-Free ............................................................................ Dynamic Range 95 dB (SFDR), 1 kHz, -1 dBFS Crosstalk 60 .................................................................... Hz, 1 Vrms, common mode -120 dBFS 1 kHz, normal mode, full-scale .................................................................... -85 dBFS aggressor ............................................................................ CMRR, 60 Hz, -73 dBFS 1 Vrms-to-earth ground Strain excitation voltage 2 V level .................................................................... 2 V ±3% 3.3 V level .................................................................... 3.3 V ±3% Output current 2 V level .................................................................... 17.8 mA 3.3 V level .................................................................... 10.1 mA Power Requirements Maximum power consumption from chassis Active .................................................................... mode 900 mW max Sleep mode .................................................................... 500 μW max Maximum thermal dissipation, from -40 °C to 70 °C Active mode .................................................................... 1.5 W max Sleep mode .................................................................... 550 mW max VSUP Power Requirements VSUP input voltage range ............................................................................ 9 V to 30 V 24 | ni.com | NI 9218 Datasheet Maximum power consumption from VSUP .................................................................... Active mode 2 W max Sleep mode .................................................................... 400 mW max Physical Characteristics If you need to clean the module, wipe it with a dry towel. Tip For two-dimensional drawings and three-dimensional models of the C Series module and connectors, visit ni.com/dimensions and search by module number. Weight .................................................................... NI 9218 with DSUB 151 g (5.33 oz) NI 9218 with LEMO .................................................................... 165 g (5.82 oz) NI 998x Physical Characteristics Screw-terminal wiring Gauge ....................................................................0.05 mm2 (30 AWG) to 1.31 mm2 (16 AWG) copper conductor wire with 6 mm (0.236 in.) of insulation stripped from the end Temperature .................................................................... rating 80 °C minimum Wires per screw terminal ............................................................................ One or two wires per screw terminal Ferrules, single wire ............................................................................ 0.25 mm2 (20 AWG) to 0.52 mm2 (24 AWG) Torque ............................................................................ for screw terminals 0.2 N · m to 0.25 N · m (1.77 lb · in. to 2.21 lb · in.) Wire securement Securement type .................................................................... Three collets provided (ranged 2.2 mm to 5.2 mm in diameter) Torque for collet nut .................................................................... 1.5 N · m (13.3 lb · in.) Weight ............................................................................ 142 g (5.0 oz) with cable NI 9218 with LEMO Safety Voltages Connect only voltages that are within the following limits: ............................................................................ Maximum voltage, ±30 V from any pin to any pin on a single connector9 9 The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to +30 V. NI 9218 Datasheet | © National Instruments | 25 Isolation Channel-to-channel, channel-to-Vsup, channel-to-earth, Vsup-to-earth (up to 5,000 m)10 Continuous ............................................................60 VDC, Measurement Category I Withstand ............................................................ 1,000 Vrms, verified by a 5 s dielectric withstand test Caution Any excitation output voltage to earth ground must remain below 60 VDC for each channel. To determine excitation output voltage to earth ground for a channel, add the maximum excitation voltage to the maximum potential on pin 3. The maximum excitation voltages are 2 V +3% and 3.3 V +3% for the bridge excitations, 12 V +5% for the +12 V excitation, and 22 V for the IEPE excitation. Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. 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 powered by regulated lowvoltage sources, and electronics. Caution Do not connect the NI 9218 to signals or use for measurements within Measurement Categories II, III, or IV. Note Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are not intended for direct connection to the MAINS building installations of Measurement Categories CAT II, CAT III, or CAT IV. NI 9218 with DSUB Safety Voltages Connect only voltages that are within the following limits: Maximum ............................................................................ voltage, ±30 V from any pin to any pin on a single connector11 10 11 26 | Must use crimp contact LEMO plug (784162-01) to maintain these ratings. Ratings are invalidated if solder version is used. The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to +30 V. ni.com | NI 9218 Datasheet Isolation Channel-to-channel, channel-to-Vsup inputs (up to 5,000 m) Continuous ............................................................60 VDC, Measurement Category I Withstand ............................................................ 1,000 Vrms, verified by a 5 s dielectric withstand test Channel-to-earth ground (up to 3,000 m) Continuous ............................................................ 60 VDC, Measurement Category I Withstand ............................................................ 1,000 Vrms, verified by a 5 s dielectric withstand test Channel-to-earth ground (up to 5,000 m) Continuous ............................................................ 60 VDC, Measurement Category I Withstand ............................................................ 860 Vrms Vsup inputs-to-earth ground (up to 5,000 m) ............................................................ Continuous 60 VDC, Measurement Category I Withstand ............................................................ 1,000 Vrms, verified by a 5 s dielectric withstand test Caution Any excitation output voltage to earth ground must remain below 60 VDC for each channel. To determine excitation output voltage to earth ground for a channel, add the maximum excitation voltage to the maximum potential on pin 3. The maximum excitation voltages are 2 V +3% and 3.3 V +3% for the bridge excitations, 12 V +5% for the +12 V excitation, and 22 V for the IEPE excitation. Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. 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 powered by regulated lowvoltage sources, and electronics. Caution Do not connect the NI 9218 to signals or use for measurements within Measurement Categories II, III, or IV. Note Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are not intended for direct connection to the MAINS building installations of Measurement Categories CAT II, CAT III, or CAT IV. NI 9218 Datasheet | © National Instruments | 27 Hazardous Locations U.S. ............................................................................ (UL) Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Canada (C-UL) ............................................................................ Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, Ex nA IIC T4 Europe (DEMKO) ............................................................................ Ex nA IIC T4 Gc Safety and Hazardous Locations Standards This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 • EN 60079-0:2012, EN 60079-15:2010 • IEC 60079-0: Ed 6, IEC 60079-15; Ed 4 • UL 60079-0; Ed 5, UL 60079-15; Ed 3 • CSA 60079-0:2011, CSA 60079-15:2012 Note For UL and other safety certifications, refer to the product label or the Online Product Certification section. Electromagnetic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use; for radio equipment; and for telecommunication terminal equipment: • EN 61326-1 (IEC 61326-1): Class A emissions; Industrial immunity • EN 55011 (CISPR 11): Group 1, Class A emissions • EN 55022 (CISPR 22): Class A emissions • EN 55024 (CISPR 24): Immunity • AS/NZS CISPR 11: Group 1, Class A emissions • AS/NZS CISPR 22: Class A emissions • FCC 47 CFR Part 15B: Class A emissions • ICES-001: Class A emissions Note In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia and New Zealand (per CISPR 11) Class A equipment is intended for use only in heavy-industrial locations. 28 | ni.com | NI 9218 Datasheet Note Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes. Note For EMC declarations and certifications, and additional information, refer to the Online Product Certification section. CE Compliance This product meets the essential requirements of applicable European Directives, as follows: • 2014/35/EU; Low-Voltage Directive (safety) • 2014/30/EU; Electromagnetic Compatibility Directive (EMC) • 94/9/EC; Potentially Explosive Atmospheres (ATEX) Shock and Vibration To meet these specifications, you must panel mount the system. Operating vibration Random .................................................................... (IEC 60068-2-64) 5 grms, 10 Hz to 500 Hz Sinusoidal (IEC 60068-2-6) .................................................................... 5 g, 10 Hz to 500 Hz Operating shock (IEC 60068-2-27) ............................................................................ 30 g, 11 ms half sine; 50 g, 3 ms half sine; 18 shocks at 6 orientations Online Product Certification Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit ni.com/ certification, search by model number or product line, and click the appropriate link in the Certification column. Environmental Refer to the manual for the chassis you are using for more information about meeting these specifications. Operating ............................................................................ temperature -40 °C to 70 °C (IEC 60068-2-1, IEC 60068-2-2) Storage ............................................................................ temperature -40 °C to 85 °C (IEC 60068-2-1, IEC 60068-2-2) Ingress ............................................................................ protection IP 40 (with power plug attached) ............................................................................ Operating humidity 10% RH to 90% RH, noncondensing (IEC 60068-2-78) NI 9218 Datasheet | © National Instruments | 29 Storage humidity (IEC 60068-2-78) ............................................................................ 5% RH to 95% RH, noncondensing Pollution ............................................................................ Degree 2 Maximum altitude ............................................................................ 5,000 m Indoor use only. NI 998x Environmental Operating ............................................................................ temperature (IEC 60068-2-1) -40 °C to 70 °C Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers. For additional environmental information, refer to the Minimize Our Environmental Impact web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document. Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee. 电子信息产品污染控制管理办法（中国 RoHS） 中国客户 National Instruments 符合中国电子信息产品中限制使用某些有害物 质指令(RoHS)。关于 National Instruments 中国 RoHS 合规性信息，请登录 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.) Calibration You can obtain the calibration certificate and information about calibration services for the NI 9218 at ni.com/calibration. Calibration ............................................................................ interval 2 years Worldwide Support and Services The National Instruments website is your complete resource for technical support. At ni.com/ support, you have access to everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers. 30 | ni.com | NI 9218 Datasheet Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and other services. Visit ni.com/register to register your National Instruments product. Product registration facilitates technical support and ensures that you receive important information updates from NI. A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer’s declaration of conformity. This system affords the user protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC for your product by visiting ni.com/certification. If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration. National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world. For telephone support in the United States, create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For telephone support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, email addresses, and current events. NI 9218 Datasheet | © National Instruments | 31 Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015. © 2015 National Instruments. All rights reserved. 376917D-01 Apr15