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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.

See below to read more about some of our completed projects within test and stimuli.

Reference projects

  • 2019-10-22 17:07 Mjukvara, Elektronik, Test & Stimuli

    Test system for 6 PCBs

    NOW has developed a test system with beds of needles for production test of six different PCBs in a product. The system measures currents, loads and measures internal voltages, comminucates via I2C and other serial interfaces, programs MCUs and FPGAs, tests motor control circuits, inputs signals to A/D converters, et c.

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  • 2019-10-22 17:08 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.

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

    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.

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  • 2019-10-22 17:23 Vision, 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.

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

    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.


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  • 2019-10-24 11:38 Elektronik, 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.


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

    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.


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  • 2019-10-24 11:51 Mekanik, 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.


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  • 2019-10-24 11:53 Mekanik, Test & Stimuli, 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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