Test & Stimulus

Test & Stimulus

NOW develops complete systems for test and stimuli for production test and product verifications. We have a vast experience of industrial measurement technologies, control and sensors, and products that withstand harsch and noisy environments.

NOW develops equipment for production testing of electrical and physical properties of products as well as inspection systems using machine vision. We have also developed stimuli equipments that generates signals to electronic products for verification of function and reliability.

Test equipment usually consists of a mechanical fixture, test electronics, data collection devices and software. The equipment is often designed to be fully automatic or used with a minimum of interaction. Depending on the tested product’s complexity, different help functions can be built into the system, and thus simplifies trouble-shooting and repair. Test results are often stored in database.

Stimuli equipment usually simulates a product’s properties to ensure function in other parts of a system. The settings may in most cases be controlled by software to simplify the use of the system.

NOW uses both self-developed system components and standard components from leading manufacturers. For the development of the software we use for example LabView™, Java, Xcaliper™, Visual Basic™, Visual C++™ or C.

To read more about some of our completed projects within test and stimuli, click here!

Reference projects

  • 2019-10-22 17:08 Flyg & Rymdteknik, Test & Stimuli, Elektronik, Mekanik

    19 inch rack emulator

    NOW has developed hardware to two 19 inch racks, where the electronics emulates the functionality of another equipment. The racks are used where the real equipment not yet is available, or cannot be used for other reasons. The rack functions are used to evaluate both electronic functions and software.

    Seven PCBs in the system were developed by NOW, plus a number of internal and external cables. PCBs and other electronics were mounted in ten EMC-safe boxes/modules, where the box fronts and backsides has engraved texts for connectors, LEDs and knobs. Both racks use 230 VAC and 100 VDC, and NOW carried through a CE marking of both racks, with the help from external testing companies.

  • 2019-10-22 17:16 Elektronik, Test & Stimuli, Försvar & Säkerhet, Flyg & Rymdteknik

    Signal generator for a vector display

    A signal generator for a vector display is designed. It creates the X, Y deflection signals, and all other signals needed to communicate with the display.  The PCB follows a standard to fit with previously designed PCBs for a test system in a 19″ rack.

  • 2019-10-22 17:16 Elektronik, Test & Stimuli, Industriell automation

    CE certification

    A CE certification study was made on a resistance meter used for quality measurements in production. Applicable directives and standards were investigated. Part of the project was to review the current design against CE, and to propose improvements on the design.

    EMC measurements in a pre-compliance lab were performed and the units were patched until they passed the CE directive.

    This gave the client valuable insight for the next generation of the boards.

  • 2019-10-22 17:18 Elektronik, Mjukvara, Industriell automation, Test & Stimuli

    Chemical industry

    NOW was contacted by a firm who had problems with one or their products, a measuring device in the chemical industry. NOW went through the designs of the different curcuit boards in the unit, and introduced changes to a number of them. New PCBs were produced, and the serial production could continue. NOW also took over, and made changes in, both the microcontroller code and the PC software in the unit.

  • 2019-10-22 17:19 Industriell automation, Test & Stimuli, Mjukvara, Elektronik

    Wireless sensor unit

    Development of hardware and software for a wireless sensor unit in a calibration tool. The project included Bluetooth Low Energy, laser, image sensor, USB and Lithium-ion battery.

  • 2019-10-22 17:20 Mjukvara, Mekanik, Test & Stimuli, Industriell automation, Vision

    Inspection of automatic lathing

    In lathing defects may occur caused by a worn or damaged lathe steel. NOW has developed a vision system for automatic inspection of automatic lathing with high precision. Data is stored in a data base for traceability. The system can be built-in in the lathe, or mounted in a separate inspection cell.

  • 2019-10-22 17:23 Mekanik, Vision, Industriell automation, Test & Stimuli, Mjukvara

    Test of safety critical software

    NOW’s vision platform AVT is used for recursive tests of safety critical software.

    During the development of the software, new functions are added, and bugs are corrected. At every new release, all parts of the software must be retested to see that the functions haven’t been altered in a unwanted fashion. This is a time consuming work if a tester must watch a display to check the functions visually. NOW has developed functions to make this automatically with use of a vision system, which has resulted in lower costs, higher quality, and a more content personnel.

  • 2019-10-22 17:25 Industriell automation, Vision, Test & Stimuli, Mjukvara

    Inspection of edges on metal details

    A tool has been developed for inspection of edges on metal details in a production line. The tool inspects measurements and form, and looks for notches and excess material, as small as some ten microns.

  • 2019-10-22 17:26 Industriell automation, Vision, Test & Stimuli, Mjukvara

    Optical Character Verification (OCV)

    NOW has developed a vision system for Optical Character Verification (OCV) . The system is used in industries where product names and text/symbols must be clearly printed on each product. This system ensures that every product that leaves the production line meets the quality requirements applicable in their respective industry.

  • 2019-10-22 17:27 Vision, Mekanik, Test & Stimuli, Medicinteknik, Mjukvara, Elektronik

    Microscope Camera

    Monochrome CCD camera for electron microscope
    Sensor: ON Semi KAI-04070
    Resolution: 2048×2048
    Frame rate: Max 25 fps
    Pixel depth: 14 bits
    Large FPGA and DDR3 memories for complex image processing in the camera
    GigE Vision video streaming to the host PC

  • 2019-10-22 17:30 Mekanik, Test & Stimuli, Mjukvara, Elektronik

    H.264 hardware encoding and decoding for full HD video

    NOW has developed a platform with H.264 hardware encoding and decoding for full HD video.

    • Video streaming over IP/ethernet to WEB browser
    • Bit rates from about 3 Mbps for 1080p30 video
    • Configurable constant or variable bit rates
    • One or multiple clients can connect to the video server
  • 2019-10-22 17:32 Mekanik, Vision, Industriell automation, Test & Stimuli, Mjukvara

    Inspection of tinned cables

    A vision system for inspection of tinned cables has been developed. The system looks for holes in the tinning. The cable is inspected in real time, when it passes four cameras, with the help of proprietary algorithms. The system includes a standard PC, four Firewire cameras with a 1024×768 resolution, optics and lighting.

  • 2019-10-22 17:33 Mjukvara, Industriell automation, Elektronik, Test & Stimuli, Mekanik

    Test system

    NOW has developed a test system with a bed of needles for final test and calibration of a circuit board. Supply voltage and measuring instruments are connected via the needles. A LabViewprogram perform calibration and functional tests. Test results are logged for the traceability of test data to the circuit boards.

  • 2019-10-22 17:33 Vision, Mekanik, Test & Stimuli, Industriell automation, Mjukvara, Elektronik

    Quality control in 2D and 3D (TQC)

    Vision system (Tile Quality Control, TQC) for difficult environments with Firewire cameras and audio analysis. The system is used for inspection/quality control in roof tile production, both in 2D and 3D. The size of the tiles is checked, and defects in the surface and edges are detected by cameras, where micrometre-thin cracks are revealed. Additionally noise analysis is used for detecting hidden cracks inside the tile.

    The software is written in C++ using DirectShow and Microsoft Visual Studio.

    The hardware consists of a PC with I/O-cards and external PLC and photoelectric sensors, and is built with Bosch Rexroth strut profiles around the conveyor belt.

    The system is fully parameter-controlled and stores the statistics. The user can choose to save images and sound recordings for a follow-up. The system has a variety of custom variants delivered to the Swedish and Danish tileworks for different kinds of clay and concrete tiles.

    Read more

  • 2019-10-22 17:35 Elektronik, Mjukvara, Industriell automation, Test & Stimuli, Universitet & Forskning

    Analysis of signals from RFID “tags” with Matlab

    A tool in Matlab to filter and analyze RFID data has been used to optimize the hardware where the signals are decoded.

  • 2019-10-22 17:36 Elektronik, Mjukvara, Test & Stimuli, Universitet & Forskning

    Precision electronics

    Development of analog and digital precision electronics for a measurement instrument. The system includes up to twelve 24-bit measurement channels, an Altera Cyclone II FPGA for collecting measurement data, GPS, Ethernet, USB and an LCD. The system is controlled by an Atmel ARM9263 CPU with a Linux operating system, and NOW also has developed drivers and VHDL code for the FPGA.

  • 2019-10-22 17:37 Mjukvara, Test & Stimuli, Mekanik, Vision, Industriell automation

    Inspection of bending

    Within a very short time frame, NOW developed a vision system for inspection of bending. The system with two Firewire cameras, lighting, control electronics and PC software, automatically inspected the bending of an tinned component pin. If copper was visible, the component was not to be used. The system looked for the colour of copper, which was very effective. The customer could easily change parameters via the PC user interface, to change for example how much copper that was allowed. Statistics were saved in a database tool.

  • 2019-10-22 17:48 Mjukvara, Test & Stimuli, Vision, Industriell automation

    Vision application in a production line

    A vision application to inspect a mechanical detail in a production line has been designed. The application looks for defects, where for example an edge may have been damaged.

  • 2019-10-22 17:52 Mekanik, Test & Stimuli, Försvar & Säkerhet, Mjukvara, Elektronik

    Data collection (HDLC, synchro-digital)

    Redesign of a data collection device for weapons systems calibration. The device has both analog and digital (HDLC, synchro-digital) inputs with various dedicated interfaces. An Altera FPGA manages the data flow from the inputs to the USB port.

  • 2019-10-24 11:17 Flyg & Rymdteknik, Industriell automation, Försvar & Säkerhet, Mekanik, Medicinteknik, Startups & Prototyper, Automotive, Universitet & Forskning, Test & Stimuli, Elektronik


    NOW helped with addressing electrical safety and EMC-related problems in a measuring instrument for industrial processes. The customer’s external PCB layout resource received directives from NOW.

  • 2019-10-24 11:23 Mekanik, Industriell automation, Universitet & Forskning, Vision, Mjukvara, Test & Stimuli, Elektronik

    Vision systems for quality control of paper paths

    NOW has developed a vision systems for quality control of paper paths in the paper industry. The system detects splicing, creases, cracks, holes, et cetera – everything that is needed to facilitate the production, make it more efficient, more profitable and ensure quality.

  • 2019-10-24 11:25 Mjukvara, Elektronik, Test & Stimuli, Mekanik, Vision, Försvar & Säkerhet, Flyg & Rymdteknik

    CCD Camera

    A complete CCD camera for military use, including mechanics, electronics and software, has been developed by NOW. The camera records a 14-bit 2048×2048 video at 160 Msamples/s. A lossless image compression with a proprietary algorithm reduces the amount of data, which is then sent over a Gigabit Ethernet link to the host computer. Basic image processing and control is done in an Altera Cyclone II FPGA. The camera is of a kinematic theodolite type.

  • 2019-10-24 11:30 Startups & Prototyper, Test & Stimuli, Elektronik

    Integrator for laboratory use

    Design of an integrator for laboratory use. The instrument integrates pulses down to 5 ns, this demands a high performance on both the analog components and the ultra-fast ECL logic.

  • 2019-10-24 11:31 Försvar & Säkerhet, Mekanik, Test & Stimuli, Flyg & Rymdteknik, Mjukvara, Elektronik

    Display system

    NOW has contributed more than 20 man-years at a customers with developing of an advanced display system, including specifications, analog and digital electronics, FPGA and ASIC methodology and coding, real-time programming in ADA and C ++ , verification, documentation, etc.

  • 2019-10-24 11:32 Universitet & Forskning, Mekanik, Vision, Industriell automation, Test & Stimuli, Mjukvara, Elektronik

    Measurement of a pendulum

    A vision application for measurement of a pendulum. The pendulum is affected by swirls of molten steel which occur when draining the steel.

  • 2019-10-24 11:32 Industriell automation, Försvar & Säkerhet, Medicinteknik, Mekanik, Automotive, Flyg & Rymdteknik, Vision, Test & Stimuli, Mjukvara, Elektronik

    Vision system for inspecting dashboards

    NOW has developed a vision system for inspecting dashboards. The system is built using DirectShow and Microsoft Visual Studio .NET 2003. Cameras deliver images that are handled in real time. Possible parameters to inspect are: colour, intensity, shape, symbols, segment displays, LCD displays, indicator positions and indicator needle movement. The application encapsulates a scripting language that is easily configured through a graphichal interface. Optional controls/commands are carried out in sequence. The system communicates with the client’s control system via TCP/IP.

  • 2019-10-24 11:34 Industriell automation, Test & Stimuli, Mjukvara, Elektronik

    Temperature regulation

    Temperature regulation of heating jackets used for example in the semiconductor industry. Control boards with temperature measurement using thermocouples (K elements) and PID regulation of the temperature. The setpoint and control parameters are set via a two-wire interface with combined CAN-link and power supply. Continuous monitoring of the actual temperature and any error conditions. An circuit from NEC was used, programmed in C. The board is compliant with IEC60065 (EN60065).

  • 2019-10-24 11:35 Startups & Prototyper, Universitet & Forskning, Test & Stimuli, Elektronik

    Temperature sensor

    Evaluation of analogue electronics for a temperature sensor -40 to +100 degrees, 4-20 mA.

  • 2019-10-24 11:38 Elektronik, Industriell automation, Test & Stimuli, Mjukvara

    Production test of air-driven hand tools

    For production test of air-driven hand tools NOW has developed equipment for the measurement of torque and speed with engine braking, air flow and other parameters. Complete system deliveries have taken place at the customer. The project is based on PC based technologies, and the software is developed in Visual Basic with an Access database for control of measurement procedures and storage of read data.

  • 2019-10-24 11:39 Elektronik, Mjukvara, Mekanik, Test & Stimuli, Industriell automation

    Testing of mobile phones batteries

    A system for testing of mobile phones batteries. A test-head with spring pins connect to the battery, and a Windows XP/2000/NT- based PC-system, with an I/O board developed by NOW, perform tests of batteries in the production line. The test data is stored in a database and a software tool developed by NOW is used to study failure types, failure rates, compare measured values to given limits, and to perform statistical analysis.

  • 2019-10-24 11:51 Flyg & Rymdteknik, Mekanik, Försvar & Säkerhet, Elektronik, Test & Stimuli, Mjukvara

    Video conversion equipment

    NOW has developed a video conversion equipment which performs conversions between different video formats, for a test station used to test and develop printed circuit boards for an advanced military airborn/flight display system. The system consists of a PC and up to six video conversion boards. The PC is used to control the conversion PCBs and to translate commands coming from the operator’s computer via Ethernet, into commands that can be interpreted by the conversion boards. Everything is assembled to fit in a 19″ rack. With this equipment it is possible to test video chains without having a complete system with different cameras and sensors. The equipment converts video between analog and digital video standards and can also store, load/read, and rotate images.

  • 2019-10-24 11:53 Försvar & Säkerhet, Mekanik, Test & Stimuli, Flyg & Rymdteknik, Mjukvara, Elektronik

    Stimulus-generation equipment

    NOW has developed several generations of stimulus-generation equipment, for a test station used to test and develop printed circuit boards for an advanced military airborn/flight display systems. A system contains up to three boards of the same type, where each board has three video outputs, two analogue and one digital. The analogue outputs can be synchronized to an external sync signal. The boards are controlled via buttons on the front panel, or with commands from the control computer via GPIB, IEEE-488.2. The equipment simulates the video from cameras, IR-cameras, radar and so on, and delivers several outputs of different video standard.



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