Presentation by Stephen Plumb about National Instruments' Data Logging Machine Monitoring and Power Monitoring during a seminar at the Ecole National Superieure Polytechnique de Yaounde.

1. Data Acquisition and Logging with NI CompactDAQ and LabVIEWSignalExpress Presented by Stephen Plumb Branch Manager NI South Africa

2. Seminar Overview Data Logging with National Instruments. Machine Condition Monitoring. Electrical Power Monitoring. Structural Monitoring

3. Data-logging Application Elements

4. Data Logging Defined Using an electronic instrument to take measurements from sensors and storing them for future use Common measurements: temperature, pressure, current, velocity, strain, displacement, etc.

5. The Long Tail Benchtop In-Vehicle Noise Vibration Harshness (NVH) Machine Monitoring Road Load Testing Environmental Monitoring Unattended Monitoring Evapotranspiration Monitoring Embedded Ultrasonic Cement Analysis Extreme Environments Structural Fatigue Analysis Wireless Sensor Networks Railway Ride-Quality Testing Helicopter Rotor Testing …

6. Simplicity vs. Flexibility Stand-alone Simplicity PC-Based Flexibility

7. Processor Display RAM Power Supply ROM Hard Disk Traditional Stand-alone Data Loggers PC-Based Data Logger What is PC-Based Data Logging?

8. PC-Based Data Logging Checklist EASY POWERFUL OPEN Simple configuration and PC connectivity Easy-to-use data-logging software Real-time data transfer Online analysis & processing capability Ability to add channels or measurement types Scalable solution for future application needs

9. Simplicity vs. Flexibility Simple & Flexible Stand-alone Simplicity PC-Based Flexibility

10. EASY: Configuration-based software & true plug-and-play hardware POWERFUL: Online analysis & high-speed data streaming OPEN: Modular I/O & scalable software POWERFUL EASY OPEN

11. DEMO: True Plug & Play Simple configuration and PC connectivity Easy-to-use data-logging software EASY POWERFUL OPEN

12. NEW! LabVIEW SignalExpress Easily log and analyze measurements without programming Quickly set up and configure data logging systems with plug and play USB technology Connect to250+ DAQ devices, 400+ instruments and 1,000s of sensors

13. What is LabVIEW SignalExpress? Configuration-based logging & analysis software

14. What is LabVIEW SignalExpress? Interactive, step-by-step data acquisition & configuration

15. What is LabVIEW SignalExpress? Always-on, customizable views display live data & analysis

16. What is LabVIEW SignalExpress? Stream data to disk Open in Microsoft Excel & email results

17. Stream Data at Over 5 MS/s True Plug & Play USB Connectivity Built-in Signal Conditioning for Sensors Over 30 Hot-swappable Modules Built-in Signal Conditioning What is CompactDAQ?

18. Data in Three Clicks True plug & play USB Automatic detection & configuration of hardware Focus on measurements and tests vs. hardware/software setup Reduced setup time 1 2 3

19. DEMO: LabVIEW SignalExpress Simple configuration and PC connectivity Easy-to-use data-logging software EASY POWERFUL OPEN

20. Online & Historical Data Analysis Built-in Analysis Functions Signal processing Time domain measurements Frequency domain measurements Statistics Digital comparison and conversion Many more… POWERFUL EASY OPEN

21. Set Alarms & Configure Events Set custom conditions to start and stop logging Start/Stop at specific date and time Start/Stop based on data Customize alarm/event actions Display messages Set analog levels Set digital lines Audible alerts

22. Create Customized Reports Reports show live view of data Drag and drop graphs and indicators Enter free form text Send to printer Export to HTML

23. DEMO: Analysis & Reporting Online analysis & processing capability Real-time data transfer EASY POWERFUL OPEN

24. I/O Capabilities in LabVIEW SignalExpress Analog Input Analog Output Static I/O Counters Correlated DIO Synchronize Plug-In Boards

25. High-Speed Parallel Signal Streaming USB STC-2 Timing and Triggering Module Auto-Detection and Control NI CompactDAQ Chassis Backplane National Instruments USB Technology

26. Increased Device Intelligence Module auto-detection & control Device contains element of driver DAQmx 9215 9211 9215 9472 9263 9233 9472 9481 9237

27. ADC ADC ADC ADC ADC DMM-Based Systems Data to PC at 1.8 MB/s (GPIB) <500 S/s ADC Relays NI CompactDAQ Over 5 MS/s Data to and from PC at 60 MB/s (USB 2.0) ADC Timing & Bus Controller (USB-STC2) ADC ADC Simultaneous, Multi-ADC System

28. USB Controller USB Multi-Stream with NI Signal Streaming Technology PC Processor Buffer USB Bus USB Input USB Output

29. DEMO: NI Signal Streaming Online analysis & processing capability Real-time data transfer EASY POWERFUL OPEN

30. Breadth of Measurements: I/O Modules Over 30 I/O modules available Up to 256 analog/digital mixed channel count Custom channel count &sensor support per system with 4ch to 32ch modules available Compatible with 1000’s of sensors POWERFUL EASY OPEN

31. Integrated DAQ, Signal Conditioning & Connectivity Guaranteed Accuracy NIST traceable calibration Built-in Signal Conditioning Direct connection to industrial sensors and actuators Signal to Backplane Isolation barrier Safety, noise immunity, common mode rejection Available 24-bit Delta-Sigma ADC DSA signals, TEDS enabled, built-in antialiasing filters

32. Isolation for Improved Accuracy & Safety Avoid ground loops Protect System and user Measure small signals on a large potential Digital Isolation

33. NEW! Isolated Modules 24-bit, ch-ch isolated, 50kS/s/ch 9229 = ±60 VDC 9239 = ±10 VDC Screw Terminals Industry standard certifications

35. Load Cells

36. Optical Encoders

37. Microphones

38. Accelerometers

39. pH electrodes

40. Headmeters

41. Flowmeters

42. Pressure gauges

44. Flexible & Scalable Data Logging Scale your applications with automatic code generation Add additional functionality Custom user interface Decision making Additional analysis Add new hardware

45. DEMO: Scalability Ability to add channels or measurement types Scalable solution for future application needs EASY POWERFUL OPEN

46. Diversity of Data-Logging Applications Benchtop Industrial In-Vehicle

47. Benchtop Instrumentation Measurements Verify circuit prototypes Characterize components Troubleshooting circuits Requirements Fast time to measurement Direct connectivity & benchtop accessories Small size (25 x 6 x 9cm) Standard time and frequency domain analysis Reporting

48. High-Voltage Isolation Integrated signal conditioning NI-DAQmx built-in OPC Server High-speed data transfer Rack mount and panel mount accessories Industrial Data Acquisition and Control

49. Halliburton Ultrasonic Cement Analyzer “The small size of NI CompactDAQ helped us minimize the footprint of the analyzer, and the modularity of the platform gives us the ability to incorporate additional measurement types for special deployment requirements.” - Rick Bradshaw, Technical Professional Leader, R&D Halliburton

50. In-Vehicle Data Acquisition DC Power Lightweight, portable Measurement support for Suspension Fuel system Comfort control Brakes Many more…

51. Honda In-Vehicle Suspension Test “This system will revolutionize in-vehicle data acquisition for us. With the CompactDAQ system, we effectively transform a myriad of wires and equipment into a smaller, cleaner, cheaper and more intuitive package." - Mike Dickinson, Transmission Research Engineer, Honda R&D Americas

52. Summary Data Logging defined LabVIEW SignalExpress & CompactDAQ Easy: Configuration-based software and plug & play hardware Powerful: Online analysis and high-speed data streaming Open: Modular hardware and scalable software Diversity of Applications

53. Machine Condition MonitoringWhy monitor machinery? Prevent catastrophic failure & significant damage Avoid loss of life, environmental harm, economic loss Stop unscheduled outages Optimize machine performance (Reduce Energy Costs) Reduce repair time and spare parts inventory Lengthen maintenance cycle (extend equipment lifespan) Reduce scrap and raw material consumption Increase product quality Safety Reduce Outages and Energy Costs Predictive Maintenance / Reduce Costs Quality Control

55. Uptime (reliability, equipment effectiveness)

57. Economics of Planned Outages Run-to-Fail Unscheduled Shutdown Production Level Preventative Scheduled Shutdown Preventative Scheduled Shutdown Traditional Approach Time Production Level Condition-based Shutdown Predictive Maintenance Approach Time

58. Noise Vibrations Lead Time of Options – What to Monitor Conditions start to change Machine condition Heat Smoke Emergency stop Time 10 min 2 days 2 weeks 3 month Courtesy of FAG Industrial Services

59. Vibration Sources- Where to Monitor Loose Mechanical Components Blade Pass / Bent Shaft Fluid Related Gears Slot Frequency / Unbalance EM related Alignment Motor Journal (Fluid Film) Bearings Mechanical Rolling Element Resonances Couplings Bearings

60. Typical Sensing Data – A real machine Gas Turbine 4 Accelerometer 4 Bearing RTD1 Gas Generator Speed 1 Power Turbine Speed 1 Fuel Flow 1 Ambient Temperature 1 Compressor Discharge Pressure 1 Compressor Discharge Temperature 1 Exhaust Gas Temperature 1 Power Turbine Exhaust Temperature 1 Power Turbine Exhaust Pressure 1 Air Mass Flow 4 Lube Oil Level Temp, Pressure,Level Gearbox 8 Radial Vibration Proximeter Probe 2 Axial Positioner 6 Bearing RTD 1 High Speed Keyphasor 1 Low Speed Keyphasor 1 Gearbox Accelerometer Compressor 4 Radial Vibration Proximeter Probe 2 Axial Positioner 4 RTD1 Suction Pressure 1 Discharge Pressure 1 Flow 1 Inlet Temperature 1 Discharge Temperature Courtesy Dresser-Rand Corporation

61. unbalance 0.0001 0.0010.01 misalignment Velocity (ips) gear mesh frequencies bearing frequencies 100 1000 10000 100000 Frequency (Hz) NI Advantages: Advanced Measurements, Advanced Analysis Typical Spectrum Showing Basic Faults Courtesy of

62. Who Uses Condition Monitoring? Power Generation Turbines (Gas, Steam, Hydro, Wind) Boilers, pumps, motor Oil, Gas, PetroChem Pumps, Compressors, expanders, motor, fans Pipelines Compressor, Pumps, piping, motor Paper Rolllers, Press, Printing, pulp refiner, motor, fans Water Pumps, Compressor, motor Food & Pharmaceuticals Mixer, Pumps, Blowers, Fans, vessel, boiler, centrifuge Marine Propulsion Turbochargers, Gearbox, Bearings, motor Metals and Mining Kilns, crusher, pulverizer Semiconductor HVAC, Electrical Power, motor

63. Who Can Use Machine Monitoring? Rotating Equipment Engineer Maintenance (Superintendent, Technician, Mgr) Machinery Engineer Reliability Engineer Facilities Engineer HVAC Engineer Manufacturing Manager

64. Nexjen Reactor Pump Vibration Monitor Challenge Provide a combined system for 32 vibration channels in four machinery locations NI Tools PXI-DSA, LabVIEW, S&V Measurement Suite Results Real-Time Monitoring Historical Data Transient Data Alarming Expands to Process Variables

66. Dedicated Instruments

68. Virtual Instruments

69. PC based solution

70. www.vibdaq.comRun-Up Waterfall Plot Cascade Plot Polar Plot Tabular List Orbit Plot

72. Alias-free, simultaneous, 24-bit A/Ds

74. Demo Sound and Vibration

75. Wind Energy: Needs Distributed Monitoring Distributed Machinery Hard to reach Expensive to repair Insurance requires machine condition monitoring Wind Turbines already on “the network”

76. Problems and Focus on Bearing Journal Bearings Varnishing - overheating due to metal to metal contact Scoring of thrust bearings: shock loading contamination

77. Effects of Bearing Failure Rotor Damage Impeller – Contact with casing and diffuser vanes Bending failure of gear teeth- seized rotor Bent Diffuser Vanes

78. Machine Monitoring Benefits

80. Real-Time Controllers

81. RIO BackplanesI/O Module I/O Module I/O Module I/O Module I/O Module I/O Module I/O Module I/O Module Ethernet RS-232

82. Case Study: FAG Industrial Services (FIS) FAG ProCheck - simple, intelligent, reliable FAG ProCheck is an intelligent online monitoring system of the latest generation that can measure, record and analyze data independently from other systems. Thanks to its very flexible configuration options, it can be used to monitor machines and components in nearly all industry sectors. Herzogenrath, April 16, 2007. In April 2007, FAG Industrial Services GmbH (F’IS) announced FAG ProCheck, a new powerful and flexible condition monitoring system for preventing unexpected production disruptions. The system stands alone in the marketplace by integrating the National Instruments CompactRIO hardware platform with the proven F’IS Administrator software to offer the right list of functions at an attractive price. “Because the system, based on CompactRIO, breaks so many of the previous boundaries for machine condition monitoring, we foresee it playing an important role in the future of the industry,” said Preston Johnson, NI Segment Manager, Sound and Vibration. http://www.fis-services.com/site/en

84. Recommendation for action by a trained analystInternet

85. Summary National Instruments provides Machine Monitoring Solutions Sound and Vibration Assistant, Partners OEM Components for Equipment Manufacturers Measurement technology partner Economies of scale Machine Monitoring Saves time and money Improves operational reliability Bring on the opps (MCM, POWER, STRUCT, NVH)

86. Machine and System OptimizationCase Studies

87. Case Study: Enginuity LLC Leading supplier of emissions reduction equipment in the oil and gas industry Engineer and install advanced combustion control technology for direct-injected, natural gas-fired industrial engines New controllers also monitor condition of engines Green Benefit: Reduced over 22,000 tons of NOx emissions with equipment tested and developed using NI technology

88. Testing New Controllers Large, older diesel engines are extremely expensive and unpredictable with how they will react to new controllers Retrofit technology must be tested and validated before being deployed on engines Enginuity used LabVIEW and PXI to simulate the engine inputs and outputs for their iFLEX engine monitoring and control system

89. Case Study: Nucor Steel Corporation One of the largest steel producers in the US, and the largest recycler Used LabVIEW and NI PACs to optimize their Marion, Ohio plant Implemented 3 automation systems to greatly increase efficiency and safety Green Benefits Prevented the over-melting of scrap steel, which wastes electricity, and requires re-heats due to poor quality Limits maximum power draw from city grid, avoiding costly penalties, and associated flicker and quality issues

91. Calculates the exact amount of electricity needed to heat the steel

93. “Once you start monitoring something in an automation system, you know you can fix things” - Dave Brandt Electrical Engineer

94. Enabling Technologies Power Monitoring Power Quality Analysis Connectivity to PLCs and Existing Systems

95. Power Quality Monitoring

96. What Is Power Quality? Power Quality The quality of the Voltage & current that is being supplied to any device Requirements The waveform of the voltage and current should be as sinusoidal as possible Constant RMS/Frequency There should be no transient features in the supply

97. Why Monitor Power? Machine fault detection Eliminate monetary fines from power company Manage generator/battery backups Troubleshoot equipment

98. Power Chain Generation Doorstop Transmission Distribution Machines

99. NI 9225 CompactRIO and CompactDAQ 3ch, 300V, 50kS/s, 24-bit Same family as 9229/9239 Ch-Ch isolation

100. Sensors Current Transformers/Transducers Waveform RMS AC/DC

101. Analysis of Electrical Power Harmonics Voltage fluctuation Sag(or “dip”) Swell Metering Demand Side Management Power Factor

102. Voltage Sag 10% < RMS Voltage < 100%

103. Voltage Swell 110% < RMS Voltage

104. Voltage Interruption RMS Voltage < 10%

105. Power TriangleRequire only V and I measurements [VA] Reactive Power [VAr] (phi) [Watts]

106. PQ Events as categorized by IEEE

107. Current Transformer

108. Competition NI VAR/Alliance member National Instruments Research Instruments SBC

109. “Next Generation Power Meter” NI Platform Advantages Ethernet and Internet connectivity Open and standard communication protocol support High-speed transient sampling Statistical analysis for trending Electronic notification of alarms Memory for data storage General Purpose User Interface Frost & Sullivan: Power Quality Meters – Next Generation” Jan 9, 2007

110. Power Quality 3rd Party Recourses LEM sensors CR Magnetics sensors Elcom

111. Why Monitor Power? Power monitoring power can be important whether being consumed or generated Protect expensive machines and equipment from failure or excessive wear Eliminate monetary fines from power company Poor power quality on your grid is subject to fines Manage generator/battery backups Troubleshoot equipment Minimize energy waste

112. Why Monitor Power?

113. Power Quality Analysis Common analysis functions performed in power monitoring systems Defined by IEEE and derived from current and voltage waveform data Harmonics/Frequency Voltage fluctuation Sag Swell Interruption Metering Demand Side Management Power Triangle

114. PQ Events as categorized by IEEE

115. Harmonics/Frequency

116. Voltage Sag 10% < RMS Voltage < 90%

117. Voltage Swell 110% < RMS Voltage

118. Voltage Interruption RMS Voltage < 10%

119. Power TriangleRequire only V and I measurements [VA] Reactive Power [VAr] (phi) [Watts]

120. Sensors Current Transformers/Transducers Waveform RMS AC/DC PF calculation with RS-485 output Industrially rated

121. Power Quality Summary Monitoring energy plays a key role in running an energy efficient machine, plant, or process Power quality can effect durability of equipment All power measurements stem from voltage and current waveform data

123. Assess structural integrity following incident (earthquake)

125. >590,000 bridges in U.S. (half were built before 1964)

126. 74,000 bridges are ‘structurally deficient’

127. American Society of Civil Engineers (ASCE) estimates that it would take $9B/year for 20 years to eliminate bridge deficiencies

128. Significant funding and research

130. Eval. behavior, load rating

133. Acoustic emissions

134. Optical

136. Deformations and displacements

137. Stresses

139. Vibrations

140. Earthquakes, incidents

141. Movements, stresses

142. TrafficSource: Development of a Model Health Monitoring Guide for Major Bridges, report submitted to FWHA, by Aktan, Catbas, Grimmelsman, Pervizpour

144. Long-term vibration monitoring with low-maintenance

146. Continuous 24x7 operation for over 2-yearsStructural Health Monitoring of the Donghai Bridge with NI LabVIEW and PXI

147. Rion-Antirion Bridge – Structural Monitoring Bridge Requirements 3 km bridge spanning the Corinth Strait in Greece Area of high seismic activity and strong winds High-channel, mixed sensor measurements Solution Four PXI/SCXI systems LabVIEW and LabVIEW Real-Time System integrator: Advitam, subsidiary of Vinci Construction Structural Health Monitoring of the Rion-Antirion Bridge

148. Beijing Olympic Venues - Seismic Monitoring and Research Continuously monitoring of seismic activity at the Beijing National Stadium and Aquatics Center Structural model validation Monitoring trigger events Email notification NI LabVIEW and CompactRIO synchronized via GPS cRIO . . . Kinemetrics Seismic Sensors

149. Vibration Monitoring of Meazza Stadium in Milan Requirements High-channel, distributed network monitoring system Structural evaluations, modal analysis, static and dynamic measurements, and corrosion testing Solution 14 CompactRIO chassis with mixed sensor connectivity LabVIEW for flexibility and advanced analysis Meazza Stadium Vibration Monitoring

150. Naini-Allahabad Bridge – Cable Stayed Bridge in India 500 monitored parameters Strain (vibrating wire), displacement, environment, GPS position 7 FieldPoint systems with LabVIEW RT Continuous monitoring High speed burst mode when threshold exceeded for vibration, wind, or GPS data

151. Smart Bridge ResearchTestbed– UCSD Powell Laboratory

152. HBM: Optical Technology for SHM Opto-electric Measurement Instrument Software Optical Strain Gages − Great number of optical SG per fiber − Light weight − Insensitive to electromagnetic interference − For use in potentially explosive atmospheres − Installation similar to electrical strain gages (SG) − catman® add-on module − Parallel recording of data from optical and conventional strain gage amplifiers − Real-time temperature compensation − Static: one to four channels, 1 to 5 S/s − Dynamic: one to four channels, 100 to 1000 S/s

153. Sensor Technologies for SHM

154. Structural Monitoring of an Overpass Image courtesy of Campbell Scientific

155. Strain Measurements in SHM Resistive Foil Vibrating Wire Fiber Optic Measures voltage across changing resistance of foil Measures change in frequency of light reflected Measures change in resonant frequency of wire

158. Strain Measurements in SHM Resistive Foil Vibrating Wire Fiber Optic Measures voltage across changing resistance of foil Measures change in frequency of light reflected Measures change in resonant frequency of wire

159. Vibrating Wire Sensor Technology Frequency-based measurement and excitation of embedded steel wire under tension Compares to nominal resonant frequency Surface mount on steel or concrete,embedment in concrete or rebar Typically 50 to 250 mm in length Not intended for dynamic or rapidly changing strain

160. Overview of Vibrating Wire Electromagnetic Coil Assembly- Excites and measures wire - Measures temp with thermistor Sensor Cable Vibrating Steel Wire Mounting Block Hermetically Sealed Stainless Steel Body Surface of Component Being Tested

161. “Pluck and Read” Swept Frequency Pluck Excitation 5 V 0 V 150 ms Measure Sine Wave Response Changes with stress/strain 0.5 – 5 mV 20-40 ms delay Measure 200-500 pulses

162. Principal of Vibrating WireFrequency Measurement ε = strain in wire Gage Factor = sensitivity of sensor spec’d by mfg. ƒ = measured frequency ƒ0 = initial frequency L = gage length T = wire tension m = mass per unit length of gage wire

163. Principal of Vibrating WireTemperature Measurement Thermistor (thermally sensitive resistor) included in vibrating wire sensors Temperature measurement used to compensate for error caused by change in temperature Current excited; extremely non-linear response

164. Connecting Vibrating Wire Sensors to NI Hardware Excitation 9474 DIO0COM C+ Response C- 9205 AI+AI-COM G Temperature T+ 9219 HI LO Can the 9217 measure thermistor of VW? Ground T-

165. 3rd Party VW Signal Conditioners Amplification and signal conditioning for vibrating wire and thermistor Often 1 to 4 channel with easy expansion through multiplexer (16 or 32 channel) For use with pressure, load, strain, and temperature

166. Connecting NI Hardware to 3rd Party VW Signal Conditioners Geokon F to V Convertor Campbell Scientific Interface for VW C- C+ T- T+ 12 V Temp Freq Ex Analog GND +12V GND T+ T- C+ C- Shield Earth GND DAQ Under redesign to use “pluck and read” instead of auto resonance. Expected ship date in March. US$ 170 -25 to 50 C+ US$ 17 -55 to 85 C Vout Sensor EN CLK RDY Appears to provide amp and sigcon, but still transmits freq to DAQ Appears to provide all necessary conditioning and transmits 0-5 V or 4-20mA

167. Vibrating Wire Sensors Pros Immunity to noisy environments Frequency transmits well over long distances Stable over long periods of time Surface mount or embed Cons Long operation periods delay reading Not for dynamic measurements

168. Fiber Optic Sensors Grating Period Λ Strain changes the frequency of light reflected by the FBG Fiber Bragg Grating(FBG) Input Light Reflected Light Transmitted Light λB

169. Fiber Bragg Grating Sensor Interface HW Micron Optics FiberSensing FiberSensing HBM Gavea Sensors Prime Photonics Micron Optics Smart Fibres

170. Fiber Optic Bragg Grating Sensors Pros Multipoint in-line measurement capability Easy to integrate in hard to reach areas High sensitivity Small / lightweight Linear response Cons Sensitive to more than one parameter Cost of sensors Require expensive processing equipment

171. Distributed Measurement Synchronization Structural signals of interest are typically ≤10 Hz cRIO, cDAQ, and PXI deliver synchronized solutions Two general classes of synchronization strategy: Signal-Based Clocks and triggers physically connected between systems Highest-precision synchronization Time-Based System components have a common reference of what time it is Events, Triggers and Clocks can be generated based on this time Examples: NTP, IEEE 1588, and GPS

172. Comparing Synchronization Technologies On-chip Precision 10-12 sec Backplane PXI Multichassis 10-9 sec GPS IRIG-B Signal-Based IEEE-1588 10-6 sec Time-Based 10-3 sec NTP sec TCP/IP Messages 10-2m 100m 101m 102m 103m 104m 105m Global <10-4m Proximity

177. http://zone.ni.com/devzone/cda/tut/p/id/4217

178. High Channel High Performance (PXI) Multi-Chassis System

179. http://zone.ni.com/devzone/cda/tut/p/id/6271

180. Distributed TimebaseComponent

182. http://zone.ni.com/devzone/cda/tut/p/id/6818

183. Read GPS Time, Position, Velocity, and Course Heading – parsing NMEA-0183

184. http://zone.ni.com/devzone/cda/epd/p/id/2197

185. IRIG-B Implementation in LabVIEW FPGA

186. http://zone.ni.com/devzone/cda/epd/p/id/3396