Contamination Analysis

Success Stories

Failure Analysis on RY4S-UAC110-120V Power Relay

Failure Analysis on RY4S-UAC110-120V Power Relay

Gideon Analytical Laboratories received several RY4S-UAC110-120V power relays for failure analysis. A relay is an electrically operated switch. Many relays use an electromagnet to operate the switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. Relays are used to control a high power or high voltage circuit with a low power circuit.
Failure Analysis on TI TMS320F28335PGFA DSP

Failure Analysis on TI TMS320F28335PGFA DSP

Gideon Analytical Laboratories received a TI TMS320F28335PGFA Digital Signal Processor for failure analysis. Digital Signal Processing applications include audio and speech processing,sonar,radar, and other sensor array processing,spectral density estimation,statistical signal processing,digital image processing, among many others. The TI TMS320F28335PGFA features high-performance static CMOS technology, a 32-bit CPU, 16 x 16 and 32 x 32 MAC operations, and Harvard bus architecture. It has up to 88 individually programmable, multiplexed GPIO pins with input filtering.
Failure Analysis on Murata Electronics GCM21BR70J106KE22L MLCCs

Failure Analysis on Murata Electronics GCM21BR70J106KE22L MLCCs

Gideon Analytical Laboratories received several Murata Electronics GCM21BR70J106KE22L Multi-Layered Ceramic Capacitors (MLCCs) for failure analysis. An MLCC consists of a number of individual capacitors stacked together in parallel and contacted via the terminal surfaces. The starting material for all MLCC chips is a mixture of finely ground granules of paraelectric or ferroelectric raw materials, modified by accurately determined additives. The Murata Electronics GCM21BR70J106KE22L has a capacitance of 10 uF, a DC voltage rating of 6.
Vishay CRCW2512220RJNEG Thick Film Chip Resistors

Vishay CRCW2512220RJNEG Thick Film Chip Resistors

Gideon Analytical Laboratories received four Vishay CRCW2512220RJNEG thick film chip resistors to be analyzed. Thick film resistors are the most used resistors in electrical and electronic devices. The resistive material is a special paste with a mixture of a binder, a carrier, and the metal oxides to be deposited. These Vishay CRCW2512220RJNEG resistors thick film chip resistors feature stability at different environmental conditions and 2mm pitch packaging option for 0603 sizes.
Contamination on HID Lamp Assemblies

Contamination on HID Lamp Assemblies

Gideon Analytical Laboratories received several high-intensity discharge lamp (HID) assemblies for determination and cause of a white powder-like substance on the inside of the lens housing. The white powder diminishes the reflective properties of the light and overall effectiveness. HID lamps are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube.
United Chemi-Con KMG Series 400V 22uF 6U Capacitors - possible Chloride

United Chemi-Con KMG Series 400V 22uF 6U Capacitors - possible Chloride

Gideon Analytical Laboratories received six United Chemi-Con KMG series 400V 22uF 6U capacitors for the specific purpose of determining whether or not they had the presence of chlorides. The analysis was performed using SEM-EDS. The SEM-EDS system gave elemental analysis in relation to the intensity of the element at a specific wavelength or energy level (Kev). SEM-EDS is an analytical technique used for the elemental analysis or chemical characterization of a sample.
Anode Electrode for Lithium-Ion Battery

Anode Electrode for Lithium-Ion Battery

Gideon Analytical Laboratories received one section of anode electrode to identify the black marking on the copper foil. This anode electrode is used in Lithium-ion batteries. A Lithium-ion battery is a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging. Lithium-ion batteries use an intercalated lithium compound as one electrode material, compared to the metallic lithium used in a non-rechargeable lithium battery.
Susumu RG3216-1000-B-T-T1 Film Resistor Failures

Susumu RG3216-1000-B-T-T1 Film Resistor Failures

Gideon received ultra precision calibration resistors. These resistors have a tolerance of .1%. The ultra precision thin film resistors are designed for high precision circuitry. They have excellent stability and reliability over the operating temperature range and low TCR characteristics. The resistors were running about .3 to .4 ohm too high. Onboard Test 1 Test 2 Test 3 Test 4 Test 5 decapsulated Halogens PCB1 100.
Carbon Disulfide and Sulfur Dioxide Attacking Buna-N O-rings

Carbon Disulfide and Sulfur Dioxide Attacking Buna-N O-rings

Gideon Analytical Laboratories received several screws to identify whether or not they were the source of carbon disulfide and sulfur dioxide, which were attacking some Buna-N O-rings. O-rings are a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring.
Contamination and Moisture on MLCCs

Contamination and Moisture on MLCCs

Gideon Analytical Laboratories received a printed circuit board (PCB) with suspected failing multi-layered ceramic capacitors (MLCC). Multilayer ceramic capacitors are fixed value capacitors in which ceramic the material acting as the dielectric. It is made up of two or more alternating layers of ceramic and a metal layer acting as the electrodes. There are various types of materials that could function as the dielectric in a capacitor, for example, glass, porcelain, paper, or mica.
Corrosion on Pcb Inside Valve

Corrosion on Pcb Inside Valve

Gideon Analytical Laboratories received two valves with failed printed circuit boards (PCBs) and corrosion inside the housing. The goal was to determine what the corrosion was and why the PCB failed. A printed circuit board mechanically supports and electrically connects electronic components using conductive trace lines, pads and other features etched from copper sheets laminated onto a non-conductive substrate. The boards are made from glass reinforced plastic with copper tracks in the place of wires.
Corrosion on Polyimide and Silicone PSA

Corrosion on Polyimide and Silicone PSA

Gideon Analytical Laboratories received a flex circuit with a mystery corrosion on the polyimide and silicone pressure sensitive adhesive (PSA). There was corrosion by-product, and the silicone adhesive appeared more like a gelatinous material than a tactic PSA. Contrary to popular belief, flex circuits are not training for a future bodybuilding competition, they are a technology for assembling electronic circuits by mounting electronic devices on flexible plastic substrates, such as polyimide, PEEK or transparent conductive polyester film.
Vishay CRCW1210-HP-e3 SM Resistor Failures

Vishay CRCW1210-HP-e3 SM Resistor Failures

Gideon Analytical Laboratories received two PCB assemblies upon which were several failing Vishay CRCW1210-HP-e3 surface mount (SM) resistors. Surface mount technology (SMT) is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a surface-mount device (SMD). In the industry, it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board.
Problems with Track Lighting

Problems with Track Lighting

Gideon Analytical Laboratories received several lighting tracks for failure analysis. They all had what appeared to be arcing which caused severe copper pitting, melting of the Noryl, and distortion of the power bus bar. The neutral bus was also pitted but not nearly as bad as the power rail. Electrical arcing is an electrical breakdown of a gas that produces an ongoing electrical discharge. The current through a normally non-conductive medium such as air produces a plasma; the plasma may produce visible light.
Electrolytic Capacitor 1

Electrolytic Capacitor 1

Gideon Analytical Laboratories received three electrolytic capacitors that were failing in the field. A capacitor stores electrical energy. They have two terminals separated by some type of insulating material, known as a dielectric. Usually, these dialectics are metal plates and the dielectric is made of materials like ceramics, mylar, or glass. Electrolytic capacitors are a type of capacitor that uses an electrolyte as one of its plates to achieve a larger capacitance per unit volume.
PCB with Open in PTH

PCB with Open in PTH

Gideon Analytical Laboratories received one printed circuit board (PCB) with an open in the plated through hole (PTH). A printed circuit board mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductive substrate. Advanced PCBs may contain components - capacitors, resistors or active devices - embedded in the substrate. PCBs are used in all but the simplest electronic products.
Vishay ES2D SM Rectifier

Vishay ES2D SM Rectifier

Gideon Analytical Laboratories, Inc. received on Vishay ES2D rectifier on a PCB. The initial condition and observation were that the diode had a conformal coating on a small circuit board in which when tested on a curve tracer had excessive leakage current across the junction and caused the PCB to fail in the application. Rectifiers are primarily used for conducting in one direction and blocking in the other. The Vishay ES2D is an ultra-fast rectifier, which means the reverse recovery time should be less than 100 ns.
153D8496G1 Circuit Card Assembly

153D8496G1 Circuit Card Assembly

Gideon Analytical Laboratories received two 153D8496G1 printed circuit boards (PCBs)for failure analysis. A PCB mechanically supports and electrically connects electronic components using conductive tracks, pads, and other features etched from copper sheets laminated onto a non-conductive substrate. Some of the electronic components that might appear on a PCB include semiconductors like diodes or transistors, discharge devices, power sources, resistors, and capacitors. The153D8496G1 circuit card assembly has 6 capacitors, 20 resistors, and 18 semiconductors all mounted to a printed wiring board.
Contamination on Synchronization Supply Units (SSU)

Contamination on Synchronization Supply Units (SSU)

Gideon Analytical Laboratories received several Synchronization Supply Units (SSU); the covers of the SSU had contamination on them. Synchronization Supply Units are important in modern digital telecommunications networks because components of the network need to be accurately synchronized. The SSU ensures reliable distribution of the time signal kept by a Primary Reference Clock (PRC). There were stains located near the Capacitor -input filters (Pi filters) on both sides of the cover of the SSU.
RoHS Compliance on Plated Steel Parts

RoHS Compliance on Plated Steel Parts

Gideon Analytical Laboratories received several plated steel parts, including coupons, hinges, and shoulder nuts. The goal was to determine if these parts were RoHS compliant. RoHS is short for Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment; it was initially created by the European Union in February of 2003. To be RoHS compliant, devices have to be free from the following hazardous substances: Lead, Cadmium, Mercury, Hexavalent chromium, Polybrominated biphenyls, and Polybrominated diphenyl ether.
Spring Evaluation

Spring Evaluation

Gideon Analytical Laboratories received several failed and several good Shanghai Daido springs for evaluation. Shanghai Daido SP Co makes four types of springs: compression, heavy load, tension, and torsion. Gideon Analytical Laboratories was altered to possible contamination on the failed springs. The goal was to see why these springs were failing. Failure analysis ensued. SEM-EDS analysis was first utilized to ascertain the elements present within the springs. Micrographs of the first spring pictured a low energy granular type structure with a shiny surface.
Trimpot Potentiometer Failures

Trimpot Potentiometer Failures

Gideon Analytical Laboratories received several Bourns Trimpot Trimming Potentiometers for failure analysis. A Potentiometer (known as a pot) is a three-terminal resistor with a sliding contact that forms an adjustable voltage divider. They are widely used for volume control in radio and television receivers. The Bourns Trimpot Trimming Potentiometer 3006P 203 has a standard resistance range of 10 to 5 megohms, the power rating of 400 volts maximum, and is ROHS compliant.
144A9284P4 Resistors

144A9284P4 Resistors

Gideon Analytical Laboratories received several GE Aviation 144A9284P4 carbon film resistors for failure analysis evaluation. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Their purpose is for creating a precise quantity of resistance for insertion into a circuit; they are typically constructed of metal wire or carbon and engineered to maintain a stable resistance value over a wide range of environmental conditions. They are frequently integrated within integrated circuits within the silicon; the resistor changes the voltage or the current in the line.
Fairchild 740L6000 Internal Contamination

Fairchild 740L6000 Internal Contamination

Gideon Analytical Labs received four Fairchild 74OL6000 field failed Optocouplers along with three good (virgin green dot) devices in which a comparison could be done. The LSTTL input compatibility is provided by an input integrated circuit, with industry standard logic levels. This input amplifier IC switches a temperature compensated current source driving a high speed 850 nm AlGaAs LED emitter. This integration scheme eliminates CTR degradation over time and temperature. The emitter is optically coupled to an integrated photodetector/high-gain, high-speed output amplifier IC.
LCD Analysis

LCD Analysis

Gideon Analytical Laboratories received several liquid-crystal displays (LCDs) that had fading issues; there were five failing LCDs and a good LCD for comparison. An LCD is a flat panel display, electronic visual display, or video display that uses the light modulating properties of liquid crystals. LCDs are extremely common in electronic devices such as laptops, digital clocks, and watches, pocket calculators, microwave ovens, or CD players. LCDs are also used in televisions and produce a sharp and vivid image.
Surface Mount Tantalum Capacitors 2

Surface Mount Tantalum Capacitors 2

Gideon Analytical Laboratories received two surface mount (SM) tantalum capacitors that had internal resistive shorts. Capacitors are passive, two-terminal electrical components used to store energy. They vary in construction, but all have at least two electrical conductors that are separated by an insulator, known as a dielectric. Tantalum capacitors are a type of electrolytic capacitor, which are ubiquitous in electronic circuits. Tantalum capacitors have a high capacitance per volume and weight and are more expensive than any other commonly used capacitor.
Ion Chromatograph Analysis

Ion Chromatograph Analysis

Gideon Analytical Laboratories received three samples in polyethylene bottles to develop an analytical procedure for determining chloride using an ion chromatograph. Ion chromatography is a process that allows the separation of ions and polar molecules based on their charge. Using ion chromatography, one can identify concentrations of major anions, including elements like sodium, lithium, calcium, and many others. Aqueous samples are quantitatively measured in the parts-per-million range. The two solutions were diluted 1:25 with DI water (18.
220 Picofarad AVX Capacitor

220 Picofarad AVX Capacitor

Gideon Analytical Laboratories received four 220 picofarad AVX capacitors for failure analysis. There are a variety of capacitors, including ceramic, aluminum, film, and tantalum, but all serve the same purpose, which is to store electrical charge. They are passive electrical components with at least two electrical conductors separated by an insulator (dielectric). The four220 picofarad AVX capacitors were giving low resistance readings. Failure analysis ensued. The four 220 picofarad AVX capacitors were inspected for mechanical cracks, which would propagate upon voltage; no cracks were found on the external ceramic.
Failure Analysis on Pulse Transformers

Failure Analysis on Pulse Transformers

Gideon Analytical Laboratories received six pulse transformers, three of which were failures, three of which were reliable. The objective was to determine the cause of the failures and inspect the unused transformers for anything that could contribute to the cause of failures. Transformers are devices that transfer electric energy from one circuit to another, usually with a change in voltage. Pulse transformers are transformers optimized for transmitting rectangular electrical pulses. Ideally, pulse transformer designers try to minimize voltage droop, rise time, and pulse distortion.
Corrosion on Lead Screw Assembly

Corrosion on Lead Screw Assembly

Gideon Analytical Laboratories received several contaminated lead screw assemblies. Also received were three insulin samples, one grease sample, and several new parts making up the lead screw assembly. Lead screws are designed to translate turning/rotary motion into linear motion. The contamination on the shaft of the assembly was primarily concentrated between the bearing and the ball seal. The goal was to identify and determine the cause of the contamination. Gideon Analytical Laboratories primarily used FTIR and SEM-EDS analysis for diagnostics.
Corrosion

Corrosion

Gideon Analytical Laboratories received metallurgical corrosion failures from lamp sockets. The materials and the insulation protection was compared to distinguish the difference between the two lamp sockets. The lamp sockets were overheating and melting the wire insulation in the application. These sockets are a type of bi-pin lamp fitting. Bi-pin lamp fittings are for use in incandescent (especially halogen) and some fluorescent lights. MR16 refers to the lamp construction and overall diameter at its largest circumference.
Connector Failure

Connector Failure

Gideon Analytical Laboratories received two failed terminal block electrical connectors from two different installation sites. These terminal connectors connect two or more wires to a single connection point, providing a convenient method of connecting electrical wiring without splicing or physically joining the ends. The two connectors were identical in construction, and both appeared burned out from overpower. The connector was cross-sectioned and SEM-EDS analysis performed. The screws in the terminal block connector typically are tin plated copper clad iron.
Vertical Cavity Surface Emitting Laser

Vertical Cavity Surface Emitting Laser

Gideon Analytical Laboratories received several VCSELs (vertical cavity surface emitting laser” with diminished light capacity over time for failure analysis. VCSELs are a type of semiconductor laser diode with laser beam emission perpendicular from the chip surface. The VCSEL has become of great importance in the optical communications field. Gideon Analytical Laboratories was tasked to diagnose the failing VCSELs. Failure analysis commenced. The devices were tested on a curve tracer to determine whether any junction problems (junction inversion, leakage current, facet oxidation, etc.
MOC101 Photocoupler

MOC101 Photocoupler

Gideon Analytical Laboratories received three failed Vishay MOC8101 isolating photocouplers for failure analysis. These photocouplers are components that transfer electrical signals between two isolated circuits by using light. Like the MOC8102, MOC8103, MOC8104, and MOC8105, the MOC8101 consists of a consisting of gallium arsenide infrared emitting diode optically coupled to a silicon planar phototransistor detector in a plastic plug-in DIP-6 package (http://www.vishay.com/docs/83660/moc8101.pdf) The MOC8101 were reported to have intermittent function, it was the goal of Gideon Analytical Laboratories to diagnose the cause of these failures.
Resistor Contamination

Resistor Contamination

Gideon Analytical Laboratories received three axial-lead resistors for failure analysis (pictured in the first picture directly below). A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Their purpose is for creating a precise quantity of resistance for insertion into a circuit; they are typically constructed of metal wire or carbon and engineered to maintain a stable resistance value over a wide range of environmental conditions.
Varactor Diode GVD30601-001

Varactor Diode GVD30601-001

Gideon Analytical Laboratories received several GVD30601-001 super hyperabrupt junction tuning varactor diodes with a latent failure mechanism over time. A varactor diode is a P-N junction diode that changes its capacitance and the series resistance as the bias applied to the diode is varied. Hyperabrupt tuning varactor diodes offer a large change in junction capacitance over a small tuning voltage range. Varactors are operated in a reverse-bias state, like a Zener diode.
Resistor Contamination

Resistor Contamination

Gideon Analytical Labs received two failed 510K, two used 510K operating for about 3 weeks, and two virgin resistors for failure analysis. A resistor is a component of a circuit that resists the flow of electrical current. It has two terminals across which electricity must pass, and it is designed to drop the voltage of the current as it flows from one terminal to the other. Resistors are primarily used to create and maintain known safe currents within electrical components.
Relay Contamination

Relay Contamination

Relays are very susceptible to contamination because the leads are made of copper and vulnerable to corrosion and leakage current if not protected from the environment. The liquid shown here was thought to have come from the flux residue and, therefore, an organic analysis FTIR was required as opposed to inorganic XRF. However, the liquid was acidic in nature and XRF was employed. The material was a filled, glass fiber reinforced material containing a phosphorus species along with an antimony/bromine fire retardant package.
Tantalum Capacitor Failure Analysis

Tantalum Capacitor Failure Analysis

Gideon Analytical Labs received four tantalum capacitors identified as failing from two vendors, Kemet (T491B225K035AT) and AVX TAJB225K035RNJ. A tantalum capacitor is a type of electrolytic capacitor. It is constructed of a pellet of tantalum metal as anode, covered by an insulating oxide layer that forms the dielectric (manganese dioxide), surrounded by conductive material as a cathode (carbon with a silver epoxy interface). Tantalum electrolytic capacitors exploit the tendency of tantalum to form a non-conductive protective oxide surface layer.
Film Capacitor Failure Analysis

Film Capacitor Failure Analysis

Gideon Analytical Labs received three partial boards with four coupling Vishay MKT 1817 63V ERO 0225 film capacitor failures. After electrical measurements and considerable testing, the ESR was found to be the cause of the failure, however, what caused the ESR to elevate? It was determined the packaging on the capacitor was not adequately protecting the terminal end from the outside environment. Moisture ingress elevated the ESR and with higher ESR, the higher the heat produced in the circuit.
FTIR Identification of Contamination

FTIR Identification of Contamination

Gideon Analytical Labs received several samples thought to a contain silicone contaminate that prevented adhesion on the metal substrate. The analysis was performed using micro-FTIR analysis for the presence of silicone in three samples. The samples were first examined under a microscope to identify the FTIR. The contaminate is a dimethyl siloxane preventing adhesion. Gideon Analytical Labs can save your company by identifying the materials that cause problems. We have many analytical techniques, instruments and years of experience in the electronic and chemical industries.
Metallurgy Corrosion

Metallurgy Corrosion

Several screws were presented to Gideon Analytical Labs due to corrosion. The screws were analyzed with SEM-EDS. The micrograph indicates the spot where this screw was analyzed. Chloride was found on the spot where corrosion was found. Gideon Analytical Labs can identify the source and cause of corrosion allowing the customer to implement the corrective action immediately. Screw Micrograph Screw EDS of Contaminate
Rubber Contamination

Rubber Contamination

Gideon Analytical Labs received contaminated rubber seals which prevented the rubber from functioning correctly. The colorless liquid gave the spectra in Figure 1. This is very similar and matches very well with a spectrum of N-(heptyl-nonyl-undecyl) phthalate, which is shown in Figure 2. This is generically known as a “phthalate ester” which is a liquid similar in appearance to vegetable oil. Phthalates are used primarily in the manufacture of polyvinyl chloride products and used as a plasticizer to create softness and flexibility.
Cold Rolled Steel Contamination

Cold Rolled Steel Contamination

Gideon Analytical Labs received a cold rolled steel plate with two corrosion blemishes on the plating. The black corrosion deposition is on zinc plating, which has oxidized with chlorine forming zinc chloride. The SEM-EDS spectrum shows an excessive amount of chlorine. The chloride is reacting with the zinc. Chlorides are very corrosive to electronic parts, plating, and metals. On copper trace lines the resistance increases, metals discolor, and on aluminum, it acts as a corrosive catalyst causing opens and pitting to metal.
Contamination on Electrolytic Capacitors

Contamination on Electrolytic Capacitors

Three lots of capacitors were submitted Gideon Analytical Labs for chloride and zinc contamination analysis on the terminal leads of the electrolytic capacitors. The analysis was performed using an SEM-EDS system giving elemental analysis in relation to the intensity of the element at a specific wavelength or energy level (Kev). Since Kev (energy levels) for specific elements do not change, these are used to identify the elements in the sample.
Polyimide Silicone Adhesive Contamination

Polyimide Silicone Adhesive Contamination

Gideon Analytical Labs received a contaminated white translucent adhesive at the edge of a polyimide strip under a rubber keypad. Since most of the materials were organic, FTIR was the method of analysis first used to determine the foreign material. The polyimide is a double-sided adhesive based flexible laminate (Kapton) film coated with adhesive on one or both and laminated to copper. There are two kinds of adhesive used in flex, epoxy, and acrylic.
Insitu Process Contamination

Insitu Process Contamination

This filter is used in a water filter system for water consumption. The filters were plugging up rather fast with the pink material shown in the photograph below. Since these problem types are unknown, one must choose the appropriate analysis method for material identification. Methods used are Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD) and Gas Chromatography-mass Spectrometry (GCMS)) since the filters were designed to filter out organics and inorganics.
Copper Wire With Nickel Plated Pad

Copper Wire With Nickel Plated Pad

This is a picture of a copper wire that used to have tin plating and nickel plated pad. The wire was running 120V at 60Hz. The connection was placed in a non-hermetical container where chlorides in the atmosphere were high. Over time the chlorides attacked the exposed copper and undermined the tin plating on the copper wires. The resistance in the wire increased, the copper arced due to this increased resistance and the socket assembly failure to corrosion.
Micro-hairs of Copper Oxide on Nickel Substrate

Micro-hairs of Copper Oxide on Nickel Substrate

This a micrograph of copper oxide deposits on nickel plating. The copper oxide is inhibiting the electrical conduction of a 120V light on terminals of a light bulb. This is an environmental failure stemming from the fact that the exposed copper on another part of this circuit, deposited copper oxide by arching, and this, in turn, caused an eventual loss in conduction to the bulb. This arcing happens when low-level contaminants are present and concentrate over time.
Strain Gauge Resistance Changes

Strain Gauge Resistance Changes

Gideon Analytical Laboratories received an industrial scale to analyze possible manufacturing defects and potential problems that affect “calibration” weight for long-term reliability. Many of these scales are used in heavy industry or veterinary applications. These scales also come in a variety of categories for different uses, including platform, drum, cylinder, and crane, among others. There was some residual contamination that sat on top of the strain gauge but under the conformal coating, which can be seen in the picture at the top left.
Tin Whiskers

Tin Whiskers

Gideon Analytical Labs performed analysis on several Melexis US2881 Sensors when the designer found shorts on the returned product from the field. Melexis US2881 sensors are bipolar Hall-effect switches designed in mixed signal CMOS technology. They have a wide voltage operating range from 3.5V to 24V, have high magnetic sensitivity, and a chopper-stabilized amplifier stage, and are suitable for automotive or consumer applications. Analysis revealed tin crystals (whiskers) spread throughout the top and bottom of the PCB, shorting out the MOSFET as well as the Hall sensor.
Process Contamination

Process Contamination

Gideon Analytical Laboratories performed failure analysis on one opened splitter module LPF-200 PCB encapsulated in the black urethane potting material and housed in plastic. The PCB was burnt in one spot, and in that spot, a cavity existed under the carbonized epoxy of the PCB adjacent to the PTH. The trace line had a number of craters strongly suggesting an “electromigration” of copper. In order for electromigration to occur with copper a voltage, an acid and medium (moisture) must be present.
Electrolytic Internal Contamination

Electrolytic Internal Contamination

Gideon Analytical Laboratories performed failure analysis on good and bad Teapo electrolytic capacitors. A comparison leakage current test of the anode foil was set up. The leakage current over time is the best indicator as to whether the anode foil has an adequate crystal ratio of aluminum oxide forms to produce long-term reliability. The foil from the failed Teapo capacitors had multiple cracks like shown in the picture at the top left.
Process Contaminates Chlorides in Electrolytic Capacitors

Process Contaminates Chlorides in Electrolytic Capacitors

Gideon Analytical Laboratories received electrolytic capacitors for chloride analysis according to a prior analysis technique for determining the presence of chloride. The chloride analysis technique was developed because chlorine is a known catalytic corrosive element on aluminum. The analysis was performed using an SEM-EDS system giving elemental analysis in relation to the intensity of the element at a specific wavelength or energy level (Kev). Since Kev (energy levels) for specific elements do not change, these are used to identify the elements in the sample.
Polymeric O-ring Identification

Polymeric O-ring Identification

Gideon Analytical Laboratories received three contaminated Buna-N diaphragms and several new ones for reference. These Buna-N diaphragms have a variety of applications, including in submersible level transmitters, actuary assemblies, air operated diaphragm pumps, and manual loading regulators. The goal was to identify the contamination and pinpoint its cause. Upon examination under a stereo-zoom microscope, it was found that the surface of the sample contains a thick layer of a gel-like material.
Premature Discharge of Ansul IQ-396X Fire Control Circuitry

Premature Discharge of Ansul IQ-396X Fire Control Circuitry

Gideon Analytical Laboratories performed failure analysis on one Ansul IQ-396X, which was submitted for possible failure due to an electrical surge. These control units have two intelligent signaling line circuits (SLC), 396 intelligent device capacity (198 intelligent detectors and 198 monitors/control modules), four built-in output circuits, up to 64 internal output circuits/relays on optional modules in the unit, 99 programmable zone output relays, and manual sensitivity adjustment. The CPU 400 unit was dissembled and the entire board and components were inspected under 40x to look for and evidence of EOS (electrical overstress) that may have affected the operation of the unit.
Organic Analysis on Metalized Substrates

Organic Analysis on Metalized Substrates

Gideon Analytical Laboratories performed failure analysis on a cold rolled steel plate that was received with what looked like tape prints, fingerprints, and black oil which all appear to interfere with the plating process. Using one microliter of methylene chloride (ACS HPLC Grade) the surface of the cold rolled steel was collected in a glass vial. A portion was then evaporate onto a KCL wafer and analyzed on an FTIR to give spectra in the top picture.