We design together

We develop design, mechanical, electronic and software solutions, using state-of-the-art technologies. We are able to offer, in the field of electronic design, a high flexibility towards many production needs. We even offer the total management of finished products, which are prepared for worldwide distribution. The customer becomes our partner: in fact, the product is designed and manufactured jointly, in total synergy.

We create customized solutions

Selmo can create a complete product, from electronic design, to the construction of thermoplastic bodies up to mass production. Each product is 100% customizable, both for the electronic part and for the thermoplastic parts, which are designed and created with injection molding systems. Based on specific requests from the customer, we have the possibility to offer different types of surface finishes thanks our wide range of options offered which include painting, chrome plating and graphic applications.

CE compliant products

Following the electronic design and production we make a proposal for the regulatory pre-compliance of the products: in fact, documented electrical safety and electromagnetic compatibility (EMC) tests are carried out in our laboratories. We also take care of supporting customers in the subsequent phases of CE certification at the accredited bodies.

Selmo produces NF Electricite and NF Performance certifiable products

Some of our texts

The following tests are to be understood as “pre-compliance”, i.e. they allow the research and development department to perform the best electronic design in such a way that creates products ready to pass the tests of the laboratories qualified to issue certifications.

So although Selmo’s laboratory does not issue certifications on products, the tests that are carried out internally have a high value of reliability for subsequent certification.

Therefore, if requested by the customer, products that pass internal tests can move on to the next step of certification since Selmo is still able to offer assistance and advice, having collaborated for many years with the most important certification laboratories.

Test R&D

ELECTROMAGNETIC COMPATIBILITY

BICLIMATIC CHAMBER CALIBRATION

Production line tests

AOI

ICT

MOBILE PROBES

X-RAY INSPECTION

R&D tests and statistical control of the finished product

TEST RUN-IN & BURN-IN

DIELECTRIC STRENGTH

IP

IK

CABLE DRAFT

REACH e RoHS

ELECTROMAGNETIC COMPATIBILITY – EMC

EN 61000

Electromagnetic interference from equipment and systems can pose a danger to human health and the environment, which is why many countries have made electromagnetic compatibility (EMC) testing mandatory so that electrical and electronic products can be marketed safely.

EMC tests consist of verifying the functionality and behaviour of the product in question which is subject to disturbances from the electrical supply network (conducted immunity) and the environment (radiated immunity) and verifying the disturbances emitted by the same product into the electrical network (conducted emission) or emitted into the environment (radiated emission). The general objectives: to determine the response of the product solicited by external disturbances; verify that the values of the disturbances emitted in the environment or in the network are below the limits prescribed in the reference standards. Among the main tests that Selmo can offer are:

Emissions

•Conducted emissions
• Mains harmonics
• Flicker (voltage fluctuations)
• Click (intermittent disturbances)

Immunity

Immunity to fast electrical transients (burst)
Immunity to surge
Immunity to electrostatic discharge

The following tests can be carried out with the assistance of Selmo, by a testing and certification laboratory:

Radiated emissions
Radio interference power
Radiated immunity
Conducted immunity
Immunity to magnetic fields at mains frequencies
Immunity to mains holes

BICLIMATIC CHAMBER CALIBRATION

Selmo has the peculiarity of being equipped with two BICLIMATIC CHAMBERS, both equipped and computerized. These can measure each feature during the product realization phase to effectively and quickly achieve the specific objectives that had been set for the product performance to fulfill the requirements of the norms in place.

AOI

AUTOMATED OPTICAL INSPECTION

The Automatic Optical Inspection follows the SMT assembly process of the boards, of which it intends to verify the absolute integrity from any assembly or welding defects. The AOI guarantees a considerable advantage in economic terms, since it allows to identify in advance possible defects, which affect the functionality of the assembled board.

The operating principle of Automatic Optical Inspection is based on the acquisition of images detected by a very high definition camera in combination with an annular lighting system, which emits flash sequence with different wavelengths capable of reaching all points of the inspected electrical board: subsequently the acquired images are compared with those present in the library or, in the case of sequential AOI, with those previously acquired. If the Automatic Optical Inspection highlights possible defects in the inspected board, a specialized operator will analyze the report and possibly restore the fault, or report the problem to the production department, quality and possibly to the design department, always internal to our company: in this way time and costs for the resolution of the fault are significantly reduced.

ICT

IN CIRCUIT TEST

For in-circuit tests we use a special ICT, which is used to intercept errors born during production, such as missing or incorrect value components, short or open circuits, inverted polarities and so on: the test is carried out using the widespread technique of the Bed of Needles, which verifies the contact mechanics of the net (or fixture), Reinterpreted through a special SW program for circuit analysis, aimed at optimizing the results and ensuring fine control over the components.

MOBILE PROBES

If parametric testing is required in a short time, we are also able to use the mobile probe system, thanks to the Flying Probe machine supplied by us that allows us to quickly process even more cards in parallel, so as to achieve effective screening and at very competitive prices even on small series of productions or samples.

X-RAY INSPECTION

The advantage of X-rays is that it can carry out a non-destructive inspection thanks to the emission of high-frequency electromagnetic radiation consisting of photons. X-rays can detect defects in weld joints, bridges or short circuits, voids in welding, and component placement defects. Solder joints that are hidden by some surface mount devices, such as ball grid arrays (BGAs) cannot be inspected by traditional verification methods, but X-ray inspection can penetrate all layers of the PCB and components and check all solder joints. By using X-ray quality control, you can ensure that your products are of the highest quality.

TEST RUN-IN & BURN-IN

The RUN-IN and BURN-IN tests are quality tests and the life span of the product. These tests are carried out through the use of climatic chambers, which are present in the laboratory. The climatic chambers are devices that allow for the setting of controlled temperature and humidity conditions, which are useful for testing the effects of specific environmental conditions on components or assembled products. The assembled products are connected to a supply tension and a base load and they are subjected to cyclic temperature variations to test their reliability.

During the RUN-IN test, the temperature and humidity parameters re set to simulate the environments of normal use of the product.
The BURN-IN test simulates the deterioration of a product over time. During the test, products are subjected to severe stress conditions to accelerate the degradation process and identify critical issues in products or components. This can enable us to identify issues at an early stage.
These tests are carried out to support Research and Development processes, or even to verify the conformity of construction specifications during production, through sampling for statistical analysis.

DIELECTRIC STRENGTH

EN 60204 EN 60335

A dielectric strength test is a test performed on products crossed by electric current. It is used to determine the effectiveness of their insulation. The test may be carried out between mutually isolated sections of one or multiple live parts and the earth. Testing is a means of qualifying the ability of a device to work safely with license plate data.

The stress to which the insulators are subjected during this test is obtained by applying high voltage (the value is fixed by the standards according to the nominal working voltage of the apparatus that is being tested) between the mains conductors and the parts which, when they are in operation, are not live and can come into contact with the operator. This test requires that the high voltage remains applied for a specific amount of time as defined by the legislation. In order to pass the test, the legislation requires that during the application of high voltage, no discharges occur and that in any case the current does not exceed the preset values. A dielectric strength test can be performed as a factory test on new equipment or can be performed on equipment that is already in service as a routine maintenance test.

IP

Verification of the degree of IP protection of the enclosures, according to EN 60529 and EN 20653

The IP code (International Protection) is a convention defined by the CEI EN 60529 standard (“Degrees of protection of enclosures”) to identify the degree of protection of the enclosures of electrical and electronic devices against the penetration of external agents whether they be solid or liquid.

The test consists in subjecting the products covered by plastic casing to splashes of water, dispensed by an arc-shaped tube, which oscillates and changes the direction of the water jet. At the end of the test, the dielectric strength test is carried out and then the plastic casing is opened. This is done in order to verity that any potential moisture introduced did not affect the safety of the use of the device. All thermostats reach IPX4 rating.

IK

EN 62262

The IEC EN 62262 (CEI 70-4) describes a method for classifying the degrees of protection of enclosures for electrical equipment against external mechanical impacts, i.e. the effect of mechanical energy discharging onto the outside of the container. Depending on the impact energy that the enclosure can absorb without exposing the user to danger, an IK degree of protection is assigned to the tested luminaire. The test consists in causing a series of impacts, delivering the degree of energy established by the legislation. At the end of the test, it is checked that parts under tension are not accessible, meaning that the IP rating is maintained and that the product is safe.

CABLE DRAFT

EN 60335 – 1: 25.15

Appliances fitted with a power cord, and appliances intended to be permanently connected to the mains supply with a flexible cable, must have cable fasteners. The cable fastener must protect the conductors against tensile and torsional stresses on the terminals and protect the insulation of the conductors from abrasion. Draught and torsion tests of the cable are carried out, to verify that the products remain functionally intact and safe despite there stresses.

REACH e RoHS

Regulation (EC) No 1907/2006, so-called REACH, is an integrated regulation for the registration, evaluation and authorisation of chemicals, which aims to ensure a higher level of protection of human health and the environment, while aspiring to maintain and strengthen the competitiveness and innovative capacities of the European chemical industry.
Through REACH it will be possible to obtain more and more complete information on:

• dangerous properties of the products handled
• risks related to exposure
• safety measures to be applied.

According to Article 1, the Regulation covers the manufacture, import, placing on the market and use of all chemicals on their own, in mixtures and articles. REACH establishes the principle that industry is responsible for managing the risks of chemicals and providing information on the safety of the substances it produces, uses or places on the market. The RoHS Directive is the Restriction of Hazardous Substances Directive adopted in February 2003 by the European Community. This legislation imposes restrictions on the use of certain hazardous substances in the electronic design and construction of various types of electrical and electronic equipment. It is closely linked to the Waste of Electric and Electronic Equipment (WEEE) Directive 2002/96/EC, which regulates the accumulation, recycling and recovery of electrical equipment.

To verify the conformity of the product we use an equipment provide data on the presence and concentration of dangerous substances within the product. These levels are ensured to comply with the limits imposed by the legislation indicated.