SCC-ACC01 Accelerometer Input Module User Guide
Contents
1. Phase degrees 100 200 300 0 01 0 1 1 10 100 1408 1404 140 14108 Frequency Hz GIN CIOL e nee sae 1 of reading Gain error temperature coefficient 10 ppm C Offset CIOL sissie enii tisietnn es 3 mV RTI Offset error temperature coefficient 1 6 uV C Nonlinearity 0 0 0 eee eeeeeeeeeeereeeeeeeees 10 ppm of full scale Recommended warm up time 5 min Amplifier Characteristics Common mode rejection ratio 80 dB at 60 Hz Output range ee eeeeeeseeeeeeeteeeeneceeeeeees 10 V Excitation Number of channels ccc00eseeeeeeees 1 Constant current SOULCE ccceeeeeeeeeees 4mA SCC ACCO01 Accelerometer Input Module User Guide 8 ni com Maximum voltage level without losing regulation Temperature drift o e Power Requirement Physical DIMENSIONS 0000cccccccccccseceeeceseseesesseees Field wiring diameter Maximum Working Voltage Maximum working voltage refers to the common mode voltage Channel to earth inputs Channel to channel inputs Environmental Operating temperature Storage temperature Relative humidity National Instruments Corporation 127 ppm C 89 mW max 3 mA max 3 mA max 420 mW max 84 mA max 8 89 cm x 2 92 cm x 1 85 cm 3 50 in x 1 15 in x 0 73 in 28 6 g 1 0 oz One 20 pin right angle male connector one 6 pin screw termin2. Guide available at ni com SC 2345 Quick Reference Label 68 pin E Series DAQ device documentation and 68 pin cable 1 8 in flathead screwdriver Numbers 1 and 2 Phillips screwdrivers Wire insulation strippers NI DAQ current version for Windows 2000 NT XP Me iy Note Software scaling of measurements is not supported on the Macintosh operating system National Instruments Corporation 3 SCC ACCO1 Accelerometer Input Module User Guide Device Specific Information 3 Note For general SCC module installation and signal connection information and information about the SC 2350 carrier refer to the SCC Quick Start Guide available for download at ni com manuals Installing the Module UN Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires You can plug the SCC ACCO1 into any analog input socket on the SC 2345 It can function as a single stage module or as the first stage of a dual stage signal conditioning configuration The socket you choose determines which E Series DAQ device channels receive the SCC ACCO1 signals as explained in the Connecting the Input Signals section For single stage input conditioning plug the SCC ACCO1 into any socket J X 1 where X is 0 to 7 and connect the input signals to the module as described in the Connecting the Input Signals section If you use the SCC ACCO1 in a dual stage
3. configuration the SCC ACCO1 must be the first stage module Plug it into any socket J X 9 and plug the second stage SCC into socket J X 1 where X is 0 to 7 Connect the input signals to the SCC ACCO1 as described in the Connecting the Input Signals section The SC 2345 connects the output signals of the first stage SCC to the inputs of the second stage SCC An example of dual stage conditioning is an SCC ACCO1 followed by a lowpass filter module SCC LPXX Although not available for the SCC ACCO01 sockets J9 to J16 are available for digital input output conditioning or control with another SCC module Refer to the SC 2345 2350 User Manual for more information on configuring connecting and installing SCC modules Connecting the Input Signals Ss Note The signal names have changed Refer to ni com info and enter rdtntg to confirm the signal names Each screw terminal is labeled by pin number lt 1 4 gt Pins 1 and 2 form a differential DIFF analog input channel for measuring the voltage across the accelerometer This channel is routed to E Series DAQ device channel X where X is 0 to 7 depending on the socket where you plug in the SCC ACCO1 Pins 3 and 4 carry the 4 mA constant current excitation source Figure 1 shows the SCC ACCO1 signal connections SCC ACCO01 Accelerometer Input Module User Guide 4 ni com SCC ACCO01 EO lex 4A 19 kHz AC gt Lowpass E Series Coupling Fiter CO Figure 1 SCC ACC01 Signal C
4. 2 Ifthe module is configured using MAX use scaling constants obtained from your sensor data sheet to convert V cc voltage to the desired unit such as newtons m s2 or g ys Note Step 1 provides proper scaling for the amplifier in the SCC ACCO1 if the module is not configured using MAX Specifications These ratings are typical at 25 C unless otherwise stated Analog Input Number of input channels 00 1 DIFF Input range eeeecsceeseceeeecsseceeeceneeees 5 V fixed gain of 2 Input Coupling 00 eee eee eeeeeeeeeeees AC highpass 1 pole RC filter 3 dB cutoff frequency 0 8 Hz Filtet ty pC iscsi bs iir or tccenietied Lowpass 3 pole Bessel 3 dB cutoff frequency 19 kHz Passband flatness ccccccesescscscseseseeeeees 0 3 dB 10 Hz 5 kHz 1 dB 5 Hz 10 kHz Input impedance 0 eee eects 0 39 uF in series with 5 MQ powered on or off Systemi MOISE scssceserssssensonconssersevenseees 130 UV ms referred to input RTI This specification is calculated relative to the input range of the module SCC ACCO01 Accelerometer Input Module User Guide 6 ni com Transfer Characteristics Gain transfer 20 20 Gain dB 40 60 80 100 0 01 0 1 1 10 100 1408 1 10 1410 14108 Frequency Hz National Instruments Corporation 7 SCC ACC01 Accelerometer Input Module User Guide Phase transfer 100
5. A USER GUIDE SCC ACC01 Accelerometer Input Module The SCC ACCO1 accelerometer ACC input module accepts an active accelerometer input signal passes it through a 0 8 Hz highpass filter amplifies it and then passes it through a 19 kHz lowpass Bessel filter and an output buffer The module has a fixed gain of 2 so the maximum input range is 5 V The SCC ACCO1 also provides a 4 mA current source for accelerometer excitation Conventions The following conventions are used in this guide lt gt Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example P0 lt 3 0 gt The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information gt g 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 the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component
6. al 28 to 16 AWG signal voltage plus the 42 VDC 30 Vms Installation Category I 42 VDC 30 Vms Installation Category I 0 to 50 C 20 to 70 C 10 to 90 noncondensing SCC ACCO1 Accelerometer Input Module User Guide Safety Maximum altitude 2 000 m Pollution Degree indoor use only 2 This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e IEC 61010 1 EN 61010 1 e UL3111 1 UL 6101B 1 e CAN CSA C22 2 No 1010 1 Sy Note For UL and other safety certifications refer to the product label or visit ni com hardref nsf search by model number or product line and click the appropriate link in the Certification column Electromagnetic Compatibility EMISSION Sres eisirean iaee tea ae EN 55011 Class A at 10 m FCC Part 15A above 1 GHz bTG0V001000 het EN 61326 1997 A2 2001 Table 1 CE C Tick and FCC Part 15 Class A Compliant 3 Note For EMC compliance operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive EMC 0 eee eee eeeeeeeeeeeees 89 336 EEC ays Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance informat
7. ion To obtain the DoC for this product visit ni com hardref nsf search by model number or product line and click the appropriate link in the Certification column SCC ACCO01 Accelerometer Input Module User Guide 10 ni com SCC ACCO1 Module Pin Assignments Figure 2 shows the I O connector pins on the bottom of the module 1 Pin1 2 Pin2 3 PWB Key 4 Pin19 5 Pin 20 Figure 2 SCC Module Bottom View Table 1 lists the signal corresponding to each pin AI X is an analog input signal channel of the E Series DAQ device AI GND is the analog input ground signal and is the reference for AI X A GND is the reference for the 15 V supplies and REF 5 V AI GND and A GND connect to the SC 2345 at the SCC PWR connector GND is the reference for the 5 V supply Table 1 SCC ACCO1 Module Pin Assignments Pin Number Signal 1 E Series AI X 2 E Series AI GND 3 4 5 6 E Series AI GND 7 Z 8 E Series AI GND 9 5 V 10 GND National Instruments Corporation 11 SCC ACC01 Accelerometer Input Module User Guide Table 1 SCC ACCO1 Module Pin Assignments Continued Pin Number Signal 11 A GND 12 13 15 V 14 15 V 15 16 17 18 19 20 National Instruments NI ni com and NI DAQ are trademarks of National Instruments Corporation Product and company name
8. onnections ACC o NOORA The signal source can be floating or ground referenced The SCC ACCO1 input circuitry includes high impedance bias resistors typically required for floating sources External bias resistors connected to ground are not required For floating signal sources in high noise environments connect the negative terminal of the signal source to the AI GND terminal on the SC 2345 screw terminal block to reduce common mode noise For information about how to configure the SCC ACCO1 module using NI DAQmx refer to the SCC Quick Start Guide Using the SCC ACCO1 Scaling Voltage Measurements If you configured the SCC ACCO1 using Measurement amp Automation Explorer MAX and are using NI DAQ the reading you get from the E Series DAQ device is properly scaled Use scaling constants obtained from your sensor data sheet to convert the accelerometer voltage to the desired unit such as newtons m s2 or g Otherwise complete the following steps to scale the readings 1 Measure the accelerometer voltage a Read the accelerometer channel on the E Series DAQ device Veseries CHX b Calculate the accelerometer voltage using this formula Vacc Vesertes 2 where Vacc is the SCC ACCO1 input voltage Veseries 18 the E Series DAQ device input voltage National Instruments Corporation 5 SCC ACCO1 Accelerometer Input Module User Guide
9. s mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD orni com patents 2002 2004 National Instruments Corp All rights reserved 371070B 01 Mar04
10. that may be hot Touching this component may result in bodily injury b e Wor NATIONAL p INSTRUMENTS bold italic monospace SC 2345 SCC Bold text denotes items that you must select in software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions SC 2345 refers to both the SC 2345 connector block and the SC 2345 with configurable connectors SCC refers to any SCC Series signal conditioning module SCC ACCO01 Accelerometer Input Module User Guide 2 ni com What You Need to Get Started To set up and use the SCC ACCO1 you need the following items Q DOD bee pe ee O SC 2345 2350 with one of the following SCC PWRO1 SCC PWRO02 and the PSO power supply SCC PWR03 requires a 7 to 42 VDC power supply not included One or more SCC ACCO1 SCC ACCO1 Accelerometer Input Module User Guide Read Me First Safety and Radio Frequency Interference SC 2345 2350 User Manual available at ni com SCC Quick Start
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