Manual - National Instruments
Contents
1. SCC FV01 Frequency Input Module User Guide 8 ni com Table 1 SCC FV01 Pin Signal Assignments Continued Pin Number Signal 9 aa 10 11 A GND 12 REF 5 V 13 15 V 14 15 V 15 16 17 AI X from first stage 18 AI X 8 from first stage 19 AI X from first stage 20 AI X 8 from first stage AI X and AI X 8 are the analog input signal channels of the E Series DAQ device AI GND is the analog input ground signal and is the reference for AI X and AI X 8 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 Pins 17 to 20 accept inputs from a first stage SCC module if you are cascading two modules National Instruments Corporation SCC FVO1 Frequency Input Module User Guide Theory of Operation Figure 2 illustrates the key functional components of the SCC FV01 Signal fe eee eee eee Source 4 T L Frequency 3 Hz M j Comparator gt 4 1H Butterworth gt Al Xx i 1 to Voltage f 3 ii CF Filter H i i ri i gt Al SENSE i e gt al GND al i c L i i S i i i i Frequency Shiz OL Comparator gt iH Butterworth H Al X 8 j i to Voltage i i 1 1 ii i Filter gt D f i2. 0 mW HD Vis See E A 0 mA Operating voltage accuracy requirements FIS V e eT ra NAA 10 SON E E nenaseibe estes 10 REPS Ve r ices AS 0 05 Physical Dimensions serseri nne 8 89 cm x 2 92 cm x 1 85 cm 3 5 in x 1 15 in x 0 73 in VO COMNECLOTS oceno n One 20 pin right angle male connector one 4 pin screw terminal detachable Wire gauge range seeeeeeereereerereee 28 to 16 AWG Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth sseeeeeeeeeeeeeeeeeereeeee 10 V Installation Category I Channel to channel sseeeeeeereeereeee 10 V Installation Category I SCC FV01 Frequency Input Module User Guide 6 ni com Environmental Operating temperature ee 0 to 50 C Storage temperature eee 20 to 70 C FAUNA IEY sec sessessg sed cbse snake doh Seance rii 10 to 90 RH noncondensing Maximum altitude cece 2 000 meters Pollution Degree indoor use only 2 Safety The SCC FV01 meets the requirements of the following standards for safety and electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL3111 1 UL 61010B 1 e CAN CSA C22 2 No 1010 1 3 Note For UL and other safety certifications refer to the product level or visit ni com hardref nsf search by model number or product line and click the appropriate link in the Certification column Electromagnetic Compati
3. 7 Triggering F V Output Stage Stage Stage Figure 2 SCC FV01 Signal Connections The SCC FV01 has two input channels designed to measure 0 to 100 Hz signals The output voltage 0 to 10 VDC varies linearly with respect to the input frequency The frequency to voltage and analog circuitry for each channel consists of a triggering stage a frequency to voltage stage and an output stage SCC FV01 Frequency Input Module User Guide 10 ni com Refer to Figure 3 as you read the following sections Input Signal f 90 Hz Threshold 0 V Hysteresis 200 mV Triggering Stage Pulse Generator Filtered Output Triggering Stage Figure 3 Input Channel Stages This stage consists of a trigger circuit that compares the input waveform to a fixed threshold and hysteresis to create a square shaped pulse for the next stage The purpose of hysteresis is to reduce the number of false triggers caused by noise In order to be measured and trigger the pulse generator the amplitude of the input signal must exceed Vrypresyortp 1 2 Vuysreresis and both the maximum and the minimum peaks must lie outside the hysteresis range The threshold for the SCC FV01 is fixed at 0 V and the hysteresis is fixed at 200 mV This means the amplitude of the input signal must be at least 100 mV and the peaks must lie on each side of the 100 mV hysteresis range in order for the signal to be measured refer to th
4. adings by multiplying the measured DC voltage by 10 to get the input frequency in hertz Measuring Frequencies Below 5 Hz The output ripple of the SCC FVO1 increases as the input frequency decreases and it is significant for frequencies below 5 Hz To overcome the effect of output ripple acquire and average at least 100 samples per period for two periods of the input frequency This gives you more accurate measurements of frequencies below 5 Hz with the exception of 0 Hz At 0 Hz there is no ripple therefore there is no special need to acquire and average your data Calibrating Offset Errors The SCC FV01 module is calibrated at the factory before shipment If you want to adjust for any errors in your system you need a function generator and an oscilloscope capable of measuring the frequency you are applying The oscilloscope must be several times more accurate than the SCC FV0O1 itself To adjust the SCC FVO1 module complete the following steps 1 Connect the function generator and oscilloscope to the input of the specific SCC FV01 channel you are calibrating 2 Adjust the function generator to output the maximum frequency and amplitude you are measuring 3 Using your software have the E Series DAQ device read the SCC FV01 channel 4 Adjust the potentiometer on top of the SCC FV01 module that corresponds to the channel you are calibrating Turn the potentiometer until your software measures the same frequency as that me
5. asured by the oscilloscope at the input SCC FV01 Frequency Input Module User Guide 4 ni com Specifications These ratings are typical at 25 C unless otherwise stated Input Characteristics Number of input channels 2 RSE Input signal amplitude 200 mV to 10 V zero crossing Input coupling 0 eee eeeene ees DC Minimum input frequency 0 0 0 0 Hz Maximum input frequency 100 Hz Minimum input pulse width 5 V pulse train oo nenn 1 5 us Input impedance Signal threshold 0 V ee 400 kQ Signal lt threshold 0 V eee 10 MQ Threshold inme e cs OV Hysteresis erer etme 200 mV Transfer Characteristics Output response time following a full scale input change 80 ms at 63 220 ms at 90 360 ms at 99 Output Offset cii sini idee eetieees 5 mV max Output offset temperature coefficient 10 ppm C Gain CIOL eis anr a EE A 0 1 max Gain error temperature coefficient 100 ppm C Nonlinearity sucess rehire ees 0 015 full scale 1 Recommended minimum 100 mV National Instruments Corporation 5 SCC FV01 Frequency Input Module User Guide Output ripple anainn 30 mV at 10 Hz input signal frequency Output Tange onin aaa 0 to 10 V NRSE Recommended warm up time 5 min Power Requirements Analog pOWer ssesssessseesesisresrererrrerseesre 100 mW a A A E E E uaeeees 4 9 mA S o D AE T 1 75 mA Digital POWE oiran nesai
6. bility Emissions ccccccccccccccccececeseeeeseseeesssseees EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Tmn Yenen e 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 eeeeeeeeeeeeeeeee 89 336 EEC National Instruments Corporation 7 SCC FVO01 Frequency Input Module User Guide B 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 hardref nsf search by model number or product line and click the appropriate link in the Certification column SCC FV01 Module Pin Assignments Figure 1 shows the I O connector pins on the bottom of the module oq Moo OO OO OO OO OO OO OO OQ 1 Pini 2 Pin2 3 PWB Key 4 Pin19 5 Pin20 Figure 1 SCC Module Bottom View Table 1 lists the signal corresponding to each pin Table 1 SCC FV01 Pin Signal Assignments Pin Number Signal 1 E Series AI X 2 E Series AI GND 3 Z 4 E Series AI X 8 5 6 E Series AI GND 7 dA 8 E Series AI GND
7. d screwdrivers Wire insulation strippers CiO B D a 6 BE ey NI DAQ current version for Windows 2000 NT XP Me SCC FV01 Frequency Input Module User Guide 2 ni com B Note Software scaling of measurements is not supported on the Macintosh operating system Refer to the SCC FVO1 Module Pin Assignments section for more information 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 FV01 into any analog input socket on the SC 2345 It can function as a single stage analog input or as the second stage of a dual stage analog input configuration The socket you choose determines which E Series DAQ device channels receive the SCC FV01 signals as explained in the Connecting the Input Signals section For single stage input conditioning plug the SCC FV01 into any socket J X 1 where X is 0 to 7 and connect the input signal wires to the module as described in the Connecting the Input Signals section 3 Note Ifyou use the SCC FVO1 in a dual stage configuration you must use it as the second stage Plug the first stage module into any socket J X 9 and p
8. e first section of Figure 3 To ensure maximum accuracy use an input signal of amplitude 200 mV 400 mV or greater 3 Note Input signals that do not pass through O V such as digital pulse trains do not meet the triggering requirements and cannot be measured The maximum input range is 10 V You can extend the input range by using an analog input module as the first stage of a dual stage configuration For example the SCC AI02 module has a gain of 0 5 and isolation If you use an SCC AIO2 as the first stage you increase the National Instruments Corporation 11 SCC FV01 Frequency Input Module User Guide effective input range from 10 V to 20 V and you increase the hysteresis range from 100 mV to 200 mV The SCC AI02 module also provides isolation between the input signal and the DAQ device Frequency to Voltage Conversion Stage This stage consists of the following e A pulse generator that produces one pulse per input cycle e A charge pump stage that uses capacitors to convert the pulse frequency to a proportional output voltage Output Stage This stage consists of a 3 Hz lowpass Butterworth filter which averages the output of the frequency to voltage conversion stage and produces a DC voltage equal to 0 1 times the input frequency National Instruments NI ni com and NI DAQ are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trad
9. e 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 371069B 01 Mar04 2001 2004 National Instruments Corp All rights reserved
10. ee USER GUIDE SCC FV01 Frequency Input Module The SCC FV01 frequency input module is a frequency to voltage converter designed to measure signals from frequency generating sensors and other periodic signal sources The DC output voltage of the module is proportional to the input frequency 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 P1 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 A When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock AN When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury bold Bold text denotes items that you must select in software
11. lug the SCC FV01 into socket J X 1 where X is 0 to 7 Sockets J9 to J16 are also available for digital input output conditioning or control Refer to the SC 2345 User Manual for more information on configuring connecting and installing SCC modules Connecting the Input Signals 3 Note The signal names have changed Refer to ni com info and enter rdtntg to confirm the signal names Q Each screw terminal is labeled by pin number lt 1 4 gt The SCC FV01 has two referenced single ended RSE input channels Pins 1 and 2 form a channel routed to E Series DAQ device channel X 8 and pins 3 and 4 form a second channel routed to E Series DAQ device channel X The value of X is determined by the number of the SC 2345 socket where you plug in the module J X 1 or J X 9 Both input channels are referenced to AI GND of the E Series DAQ device National Instruments Corporation 3 SCC FVO01 Frequency Input Module User Guide B Note If your application requires nonreferenced inputs consider using an SCC AI Series module as the first stage in a dual stage configuration For information about how to configure the SCC FV01 module using NI DAQmx refer to the SCC Quick Start Guide Using the SCC FV01 Scaling Voltage Measurements If you configured the SCC FVO01 using Measurement amp Automation Explorer MAX and you are using NI DAQ the reading you get from the E Series DAQ device is properly scaled Otherwise you must scale your re
12. such as menu items and dialog box options Bold text also denotes parameter names Wor NATIONAL p INSTRUMENTS italic monospace SC 2345 SCC 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 sections of code programming examples and syntax examples 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 configurable connector SCC refers to any SCC Series signal conditioning module What You Need to Get Started To set up and use the SCC FV01 you need the following items Q SC 2345 2350 with one of the following SCC PWRO1 SCC PWRO0O2 and the PSO1 power supply SCC PWR03 requires a 7 to 42 VDC power supply not included One or more SCC FVO1 SCC FVO1 Frequency Input Module User Guide SC 2345 2350 User Manual available at ni com SCC Quick Start Guide available at ni com Read Me First Safety and Radio Frequency Interference SC 2345 Quick Reference Label 68 pin E Series DAQ device documentation and 68 pin cable 1 8 in flathead screwdriver Numbers and 2 Phillips hea
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