SCXI 16-Channel RTD Module NI SCXI-1503 NEW! • 16 channels of voltage or resistive inputs • Ideally suited for 2-, 3-, and 4-wire RTD and thermistor measurements • Programmable gain settings per channel • 5 Hz filter per channel • 100 μA current excitation • 333 kS/s maximum sampling rate • NI-DAQmx driver software simplifies configuration, scaling, and measurements Operating Systems • Windows XP/2000/NT Recommended Software • LabVIEW • LabWindows™/CVI • Measurement Studio Other Compatible Software • Visual Basic, C, C++ Measurement Services Software (included) • NI-DAQmx driver software • Measurement & Automation Explorer configuration utility Calibration Certificate Included Overview Current Source Operation The National Instruments SCXI-1503 RTD module provides 16 differential input channels, 16 channels of 100 μA current excitation, and one cold-junction (CJ) sensor channel. The NI SCXI-1503 is ideally suited for measuring resistive transducers, such as RTDs or thermistors. Each channel has an amplifier with a selectable gain of 1 or 100 and a lowpass filter with a 5 Hz cutoff frequency to reject 50/60 Hz noise. The SCXI-1503 can programmatically connect each input to ground, which greatly improves its accuracy by enabling a self-calibration of each input to reduce offset drift errors. You can multiplex several SCXI-1503 modules and other SCXI modules into a single channel on the data acquisition device, greatly increasing the number of analog input signals that you can digitize. The SCXI-1306 is a front mounting terminal block that offers screw-terminal connectivity for the SCXI-1503. SCXI-1503 current sources continuously provide 16 channels of 100 μA current excitation. These current sources are on whenever the SCXI chassis is powered on. SCXI-1503 current sources are designed to be accurate within ±0.05 percent of the specified value with a temperature drift of no more than ±5 ppm/°C. The accuracy and stability of these current sources make them especially well-suited to measuring resistance to a high degree of accuracy. Analog Input Each of the 16 differential analog input channels feeds to a separate instrumentation amplifier with a programmable gain of 1 or 100. Each channel has a fixed 100 μA current excitation. Then the signal passes through a fixed two-pole, 5 Hz lowpass filter. The CJ sensor input channel reads the sensor temperature from the terminal block. The temperature sensor is for cold-junction compensation of thermocouple measurements. The CJ sensor channel also passes through a 5 Hz lowpass filter to reject unwanted noise on the SCXI-1503. Along with the other 16 input channels, the CJ sensor is multiplexed to the output buffer, where the data acquisition device can read it. Calibration The SCXI-1503 is shipped with a calibration certificate and is calibrated at the factory to the specifications described in NI SCXI-1503 Specifications. Calibration constants, stored inside the calibration EEPROM, provide software correction values that your application development software uses to correct the measurements for both offset and gain errors in the module. Measurement Services Software NI-DAQmx measurement services software is included with all National Instruments data acquisition and signal conditioning products. This easy-to-use software tightly integrates the full functionality of your NI data acquisition hardware with NI LabVIEW, LabWindows/CVI, and Measurement Studio for Visual Basic software. High-performance features include multidevice synchronization, networked measurements, and DMA data management. Bundled with NI-DAQmx, the Measurement & Automation Explorer (MAX) utility simplifies the configuration of your measurement hardware with device test panels, interactive SCXI 16-Channel RTD Module measurements, and scaled I/O channels. NI-DAQmx also provides numerous example programs for LabVIEW and other application development environments to get you started with your application quickly. Terminal Block SCXI-1306 Part Number 779698-01 Type Screw terminals/front mounting Table 1. Terminal Block Option for SCXI-1503 Calibration Source AI 0 + Lowpass Filter Buffer AI 0 + Buffer Mux Inst. Amp AI 0 – – AI 0 – Gain 0 Inst. Amp AI 15 – Lowpass Filter OUT REF 32-to-1 Mux + Mux Switch Switch Buffer – IEX 0 + 100 μA Gain 31 Front Signal Connector AI 15 + AI GND Switch Rear Signal Connector + IEX 0 – AB 0 + IEX 15 + Input Select 100 μA IEX 15 – CJSENSOR Digital Interface and Control SCXIbus Interface Gain Select Calibration EEPROM Input Protection and Lowpass Filter Buffer SCXIbus Connector AB 0 – Figure 1. SCXI-1503 Block Diagram Ordering Information NI SCXI-1503 ........................................................................779638-01 NI SCXI-1306 (terminal block) ..............................................779698-01 For information on extended warranty and value-added services, visit ni.com/services. BUY NOW! For complete product specifications, pricing, and accessory information, call 800 813 3693 (U.S.) or go to ni.com/scxi. BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.) 2 SCXI 16-Channel RTD Module Amplifier Characteristics Specifications >> For complete specifications, see the NI SCXI-1503 Specifications manual at ni.com/manuals. Specifications are typical at 25 °C unless otherwise noted. Specifications do not include transducer error. Input Characteristics Number of channels............................ 16 differential Input coupling ..................................... DC Input signal ranges ............................. ±100 mV (gain = 100) or ±10 V (gain = 1) Input overvoltage protection Powered on..................................... ±42 VDC Powered off .................................... ±25 V Inputs protected.............................. AI<0..15> CJ sensor input protection ............. ±15 VDC powered on or off Transfer Characteristics Nonlinearity......................................... 0.005% FSR Input offset error (RTI) Gain = 1 Calibrated1 .................................. ±650 μV max ±250 μV typ With autozero enabled2 ............. ±300 μV max ±150 μV typ Gain = 100 Calibrated1 .................................. ±25 μV max ±10 μV typ With autozero enabled2 ............. ±10 μV max ±5 μV typ Gain error (relative to calibration reference) Gain = 1 or 100 Calibrated1 .......................................... 0.074% of reading max 0.02% of reading typ 1Assumes 1,000 point average, 25 °C ±10 °C over one year. 2Assumes 1,000 point average, ±1 °C of autozero temperature. Input coupling ..................................... Input impedance Normal powered on........................ Input bias current................................ CMRR characteristics (DC to 60 Hz) Gain 1.............................................. DC >1 GΩ ±2.8 nA -75 dB min -90 dB typ Gain 100.......................................... -106 dB min -110 dB typ Output range ....................................... ±10 V Output impedance............................... 91 Ω Dynamic Characteristics Minimum scan interval (per channel, any gain) ±0.012% accuracy .......................... 3 μs ±0.0061% accuracy ........................ 10 μs ±0.0015% accuracy ........................ 20 μs Noise characteristics (RTI) Gain = 1 10 Hz to 1 MHz........................... 100 μVrms Gain = 100 10 Hz to 1 MHz........................... 1 μVrms 0.1 to 10 Hz ................................ 0.5 μVpp Filter Cutoff frequency (-3 dB)...................... 5 Hz NMR (60 Hz)........................................ -40 dB min Step response characteristics (gain 1 or 100) To 0.0015%..................................... 0.6 s Stability Recommended warm-up time............. 20 min Offset temperature coefficient Gain = 1 .......................................... ±35 μV/°C max ±10 μV/°C typ Gain = 100 ...................................... ±1.5 μV/°C max ±0.5 μV/°C typ Gain temperature coefficient (gain 1 or 100)................................. ±15 ppm/°C max ±5 ppm/°C typ RTD Measurement Accuracy Measured Temperature °C 100 W Max °C 100 W Typ °C 1000 W Max °C 1000 W Typ °C -100 to 0 0 to 25 25 to 100 100 to 500 500 to 1200 0.60 0.62 0.69 1.11 2.06 0.23 0.23 0.25 0.37 0.65 1.09 1.11 1.20 1.68 2.81 0.46 0.47 0.49 0.65 1.04 Notes: The accuracies in this table reflect using the module in 4-wire mode. They do not include errors from the RTD such as lead-wire errors when using 2- or 3-wire connections. The accuracies assume autozero is enabled and the environmental conditions are 25 °C ±10 °C over a one-year period. Excitation Channels.............................................. Current output..................................... Accuracy.............................................. Temperature drift ................................ Output voltage compliance................. Maximum resistive load ..................... Overvoltage protection ....................... Measurement Category ...................... 16 single-ended outputs 100 μA ±0.05% ±5 ppm/°C 10 V 100 kΩ ±40 VDC CAT I These accuracies were computed using a standard RTD with a TCR of 3851. BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.) 3 SCXI 16-Channel RTD Module Power Requirements from SCXI Backplane Electromagnetic Compatibility V+ .................................................... 18.5 to 25 VDC, 170 mA V- .................................................... -18.5 to -25 VDC, -170 mA +5 V .................................................... +4.75 to 5.25 VDC, 50 mA This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement, control, and laboratory use: Environmental • EN 61326 EMC requirements; Minimum Immunity • EN 55011 Emissions; Group 1, Class A • CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A Operating temperature ....................... Storage temperature........................... Humidity .............................................. Maximum altitude............................... Pollution degree (indoor use only)...... 0 to 50 °C -20 to 70 °C 10 to 90% RH, noncondensing 2,000 m 2 Physical Note: For EMC compliance, operate this device according to product documentation. CE Compliance This product meets the essential requirements of applicable European Directives, as amended for CE marking, as follows: 3.0 cm (1.2 in.) • 2006/95/EC; Low-Voltage Directive (safety) • 2004/108/EC; Electromagnetic Compatibility Directive (EMC) Note: Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain 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. 17.2 cm (6.8 in.) Waste Electrical and Electronic Equipment (WEEE) 18.8 cm (7.4 in.) EU Customers: At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/environment/weee.htm. Figure 2. SCXI-1503 Dimensions Weight................................................. 745 g (26.3 oz) Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the commonmode voltage. Signal + common mode ...................... Each input should remain within ±10 V of AI GND Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN-61010-1 • UL 61010-1, CSA 61010-1 Note: For UL and other safety certifications, refer to the product label or visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column. BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.) 4 NI Services and Support NI has the services and support to meet your needs around the globe and through the application life cycle – from planning and development through deployment and ongoing maintenance. We offer services and service levels to meet customer requirements in research, design, validation, and manufacturing. Visit ni.com/services. Training and Certification NI training is the fastest, most certain route to productivity with our products. NI training can shorten your learning curve, save development time, and reduce maintenance costs over the application life cycle. We schedule instructor-led courses in cities worldwide, or we can hold a course at your facility. We also offer a professional certification program that identifies individuals who have high levels of skill and knowledge on using NI products. Visit ni.com/training. 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Find immediate answers to your questions at ni.com/support. We also offer service programs that provide automatic upgrades to your application development environment and higher levels of technical support. Visit ni.com/ssp. Hardware Services NI Factory Installation Services NI Factory Installation Services (FIS) is the fastest and easiest way to use your PXI or PXI/SCXI combination systems right out of the box. Trained NI technicians install the software and hardware and configure the system to your specifications. NI extends the standard warranty by one year on hardware components (controllers, chassis, modules) purchased with FIS. To use FIS, simply configure your system online with ni.com/pxiadvisor. Calibration Services NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. We provide manual calibration procedures, services to recalibrate your products, and automated calibration software specifically designed for use by metrology laboratories. Visit ni.com/calibration. Repair and Extended Warranty NI provides complete repair services for our products. Express repair and advance replacement services are also available. We offer extended warranties to help you meet project life-cycle requirements. Visit ni.com/services. *351537A-01* 351537A-01 2007-9254-321-101-D © 2007 National Instruments Corporation. All rights reserved. CVI, LabVIEW, Measurement Studio, National Instruments, National Instruments Alliance Partner, NI, ni.com, and SCXI are trademarks of National Instruments. The mark LabWindows is used under a license from Microsoft Corporation. Other product and company names listed are trademarks or trade names of their respective companies. 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