Equipment selection directly impacts efficiency, quality and data reliability. Standard ovens, precision ovens and temperature-humidity test chambers have distinct functional boundaries and application scenarios. Many enterprises suffer cost waste or functional insufficiency due to improper selection. This guide clarifies selection logic, breaks down matching schemes, avoids common pitfalls and provides precise guidance based on practical scenarios.
1. Core Selection Logic
Adhere to the four-step framework of defining demand types → verifying temperature accuracy → supplementing environmental requirements → matching budget to clarify equipment selection boundaries.
Step 1: Define Demand Types
Choose oven series for process applications (drying, curing, etc.).
Choose temperature-humidity test chambers for environmental reliability verification (extreme temperature variation, humidity exposure).
Note: Ovens lack cooling function and cannot replace test chambers.
Step 2: Verify Temperature Control Accuracy
Standard ovens: Suitable for applications allowing ±5℃ temperature deviation.
Precision ovens: Required for high-precision scenarios (±1℃ tolerance, e.g., electronic packaging, medical sterile drying).
Temperature-humidity test chambers: Ideal for extreme environment testing, with accuracy up to ±1℃ (even ±0.5℃ for premium models).
Step 3: Supplement Environmental Requirements
Ovens: Applicable for ambient temperature heating only.
Temperature-humidity test chambers (including humidity-controlled models): Necessary for low-temperature (-20℃ ~ -70℃), cyclic temperature variation or humidity control (e.g., 85℃/85%RH) applications.
Note: Precision ovens do not support cooling or humidity control functions.
Step 4: Match Budget
Standard ovens (thousands of CNY): For basic drying tasks with limited budget.
Precision ovens (10,000 ~ 100,000 CNY): For processes requiring high precision and stability.
Temperature-humidity test chambers (100,000 ~ hundreds of thousands of CNY): For professional environmental testing; reserve budget for operation and maintenance.
2. Typical Application Scenarios: Demand-Equipment Matching
This section breaks down matching schemes for three key sectors (electronics, automotive, medical & research) to provide intuitive references.
Electronics Industry
Simple component drying (±5℃ tolerance): Standard oven
PCB solder paste curing (±0.5℃ accuracy, ±1℃ uniformity, multi-stage temperature control): Precision oven
Chip cyclic testing (-40℃ ~ 125℃, data traceability required): Temperature-humidity test chamber
Automotive Industry
Basic part drying (±5℃ tolerance): Standard oven
Sensor 24-hour aging test at 85℃ (±0.3℃ accuracy): Precision oven
Battery pack rapid temperature cycling test (-40℃ ~ 85℃): Rapid temperature change test chamber
Medical & Research Industry
Routine consumable drying (±5℃ tolerance): Standard oven
Syringe & catheter sterile drying (±0.5℃ accuracy, clean inner chamber, data traceability): Precision oven with 316 stainless steel enclosure
Plastic material thermal stability study (-30℃ ~ 150℃): Temperature-humidity test chamber
3. Common Selection Pitfalls: Risk Avoidance
Misconceptions often lead to wrong selections. Focus on avoiding these three key pitfalls:
Pitfall 1: Using standard ovens instead of precision ovens
Short-term cost reduction may cause higher product rejection rates and increased long-term costs.
Solution: Always choose precision ovens for applications requiring ±1℃ accuracy; improved yield will offset the incremental cost.
Pitfall 2: Using precision ovens for temperature cycling tests
Ovens lack cooling capability, leading to test failure.
Solution: Directly select temperature-humidity test chambers for low-temperature or cyclic temperature variation tests.
Pitfall 3: Blindly pursuing high-spec test chambers
Results in cost waste and underutilization of functions.
Solution: Select equipment strictly based on actual test parameters to balance demand and budget.
Conclusion
The core of equipment selection lies in precise demand matching. Clarifying demand types and core parameters, combining scenario requirements with budget planning, and avoiding common pitfalls will maximize equipment value, support production quality improvement and boost R&D efficiency.
In industrial processes like electronic component aging, new material curing and precision part drying, equipment temperature control, space utilization and stability directly impact product quality and efficiency. The 86L three-layer compound precision oven, with optimized structure and core technology upgrades, is an ideal choice for balancing mass production and refined processes. This article analyzes its key industrial advantages from core performance perspectives.
I. ±0.5℃ High-Precision Temperature Control, Laying a Solid Foundation for Process Stability
Precision industrial processing has extremely low tolerance for temperature fluctuations; minor deviations may cause product performance degradation or batch scrapping. Equipped with a high-precision PT100 temperature sensor and intelligent PID self-tuning control system, this oven achieves ±0.5℃ precise temperature control from room temperature to 300℃, reducing temperature fluctuation by over 40% compared to traditional equipment. Combined with multi-zone independent heating and optimized air duct design, internal temperature uniformity is controlled within ±1℃, ensuring consistent heating of multi-layer materials and improving yield of processes such as electronic component aging testing and composite curing.
II. Three-Layer Compound Structure + 86L Capacity, Balancing Efficiency and Flexibility
To meet industrial needs of multi-batch, small-batch or same-batch multi-specification processing, the equipment adopts a three-layer independent cavity design. The 86L capacity enables one-time multi-material partition processing. Each cavity supports independent parameter setting (temperature, holding time, etc.), allowing simultaneous same-process batch production or different material drying/curing, greatly improving equipment utilization and reducing multi-category production costs. Detachable shelves enhance space adaptability, fitting processing needs of PCB boards, electronic components, small auto parts and other materials.
III. Efficient Energy-Saving Design, Reducing Long-Term Operating Costs
Long-term energy consumption is a key concern for enterprises. This oven adopts a double-layer stainless steel structure filled with high-density ceramic fiber insulation (thermal conductivity <0.035W/(m·K)) and a sealed door, reducing heat loss and improving insulation by 30% vs. traditional equipment. The intelligent temperature control system dynamically adjusts heating power to avoid ineffective energy use. Equipped with a high-efficiency centrifugal fan for forced hot air circulation, the heating rate reaches 5-10℃/min, shortening preheating time, improving thermal efficiency and significantly reducing long-term electricity costs.
IV. Comprehensive Safety Protection, Ensuring Production Continuity
Safety is critical in industrial production. The equipment has multiple protection mechanisms: over-temperature alarm (auto power-off when exceeding set value by 10-20℃), leakage protection (grounding resistance ≤4Ω), and furnace door safety interlock (immediate heating stop when opened to prevent scalds). It also features motor overload protection and power-off memory (auto recovery of parameters after restart, avoiding material loss from process interruption). High-quality stainless steel inner tank and high-temperature resistant heating tubes ensure stable long-term high-temperature operation (heating element service life >30,000 hours), reducing maintenance and downtime.
V. Intelligent Control, Adapting to Industry 4.0 Production Needs
Equipped with a PLC control system and touch screen interface, the equipment supports storage of over 10 program groups. It can preset complex temperature curves for automatic multi-stage heating and heat preservation, reducing manual errors. Optional RS485/USB interfaces enable real-time temperature data export and remote monitoring, facilitating process tracing and optimization. Simple operation logic reduces training costs, allowing quick mastery by non-professionals and meeting large-scale standardized production requirements.
In summary, with core advantages of precise temperature control, efficient space utilization, energy saving and safety, the 86L three-layer compound precision oven perfectly fits precision processing needs of electronics, automotive and new material industries. Its design balancing production efficiency and process flexibility meets current enterprise needs and adapts to future capacity expansion and product upgrading, serving as a cost-effective solution in industrial precision heating.
1. Reliability Testing of Automotive Sensors
Core Function: Verify performance stability of sensors under extreme temperature conditions, screen defective products, and ensure driving safety.
Specific Applications:
Temperature cycle test: Simulate engine compartment temperature fluctuations of -40℃~150℃ to test sensor signal accuracy and response speed.
High-temperature aging: Sustained 500–1000 hours at a constant temperature of 100–150℃ to accelerate material aging and evaluate long-term reliability.
Damp-heat test: 1000-hour test under 85℃/85% RH environment to verify moisture resistance and circuit stability.
Case: An ABS wheel speed sensor manufacturer adopted precision ovens for high-temperature aging with temperature control accuracy of ±0.3℃, ensuring product detection accuracy of ±0.1km/h and significantly improving overall vehicle safety performance.
2. Curing and Drying of Automotive Electronic Components
Core Function: Ensure firm soldering of electronic components, remove moisture, enhance insulation, and improve product reliability.
Key Applications:
PCB solder paste curing: Precise temperature control at 80–120℃ to ensure uniform and firm soldering and prevent cold solder joints/short circuits.
Electronic module sealing: Curing of sensor potting adhesive to ensure waterproof and dustproof performance.
Wire harness insulation treatment: Remove moisture and enhance insulation to prevent circuit failures.
Case: A vehicle ECU manufacturer used fully sealed precision ovens with temperature control accuracy of ±0.5℃, ensuring stable operation of electronic components under high-temperature and high-humidity conditions and reducing product failure rate by 40%.
3. Aging and Performance Testing of Rubber Seals
Core Function: Evaluate heat resistance of rubber materials, predict service life, and prevent leaks and malfunctions caused by seal failure.
Key Applications:
Hot air aging test: 7–90 days of testing at 70–200℃ to measure hardness change, tensile strength retention rate, and compression set.
Heat resistance evaluation of O-rings/gaskets: Verify temperature resistance of FKM and other materials in fuel systems.
Seal strip aging resistance: 168-hour test of automotive door and window seal strips at 100℃±2℃ to ensure long-term sealing performance.
Case: An automotive engine seal manufacturer used precision ovens for aging tests with temperature uniformity of ±1℃, accurately evaluating material service life and reducing engine oil leakage failure rate by 60%.
4. Coating Curing of Automotive Parts
Core Function: Ensure uniform coating curing, enhance adhesion, wear resistance, and corrosion resistance.
Key Applications:
Headlight cover UV coating curing: 2-hour constant temperature at 80℃ to ensure coating hardness and transparency.
Brake pad adhesive curing: Curing at 150–200℃ to ensure firm bonding between friction materials and back plates.
Automotive wheel hub spray coating curing: Ensure uniform and firm coating to improve appearance and durability.
Case: An automotive lamp manufacturer adopted precision tunnel ovens for UV coating curing with temperature uniformity of ±1℃, increasing production capacity by 50% while ensuring compliance of product light transmittance and hardness.
5. Heat Treatment of Automotive Metal Parts
Core Function: Improve metal microstructure, enhance strength, toughness, and wear resistance to meet stringent requirements of automotive parts.
Key Applications:
Aging annealing of aluminum alloy die castings: 150–250℃ to eliminate internal stress and improve dimensional stability and strength.
Heat treatment of bearings/gears: Improve material microstructure to enhance wear resistance and fatigue strength.
Spring tempering: Precise temperature control to ensure stable elastic performance.
6. Other Key Applications
Interior part shaping: Softening and shaping of seat/instrument panel leather at controlled temperatures to ensure aesthetics and durability.
Composite material processing: Hot-press forming of carbon fiber components to ensure material strength and stability.
Automotive tire production: Preheating before tire vulcanization to ensure molding quality and uniformity.
Precision ovens are widely used in temperature-sensitive scenarios like electronics and laboratories due to their accurate temperature control and uniform temperature field. Correct operation ensures precision and extends service life. Below is the standardized procedure and core precautions.
I. Pre-operation Preparation
1. Equipment Inspection: Confirm no external damage, secure power/grounding connections, intact non-aging sealing strips, and unobstructed vents. For humidification models, check water tank level and replenish distilled water if insufficient.
2. Environment Confirmation: Ensure dry, well-ventilated environment away from flammables, no obstacles blocking heat dissipation. Maintain room temperature 5–35℃, avoiding direct strong light or drastic temperature changes.
3. Material Preparation: Use non-corrosive, non-volatile flammable materials. Select clean, dry suitable carriers (stainless steel trays, quartz boats). Strictly prohibit sealed or fully liquid-filled containers.
II. Core Operating Procedures
1. Startup Initialization: Connect power, turn on main switch, wait for system self-check (3–5 seconds, no display errors). Troubleshoot fault codes per manual before restarting.
2. Parameter Setting:
Temperature: Set target per process, distinguish "working chamber/surface temperature". For precision, refer to internal probe data; fluctuation ±0.5~±2℃ (per equipment precision).
Time: Set constant temperature duration (timing after reaching target; some support heating/constant temperature switching). Confirm 24h mode for continuous operation.
Auxiliary: Set blower speed (avoid material displacement), humidity for humidification/dehumidification models, and multi-stage profiles for programmable models.
3. Material Loading & Startup: Place trays stably with ≥5cm clearance from walls/probes (no air duct blockage). Close door tightly and press "Start" to heat.
4. Operation Monitoring: Monitor display in real time; stop and troubleshoot immediately if over-temperature/alarm. Record internal temperature regularly for precision experiments.
5. Shutdown & Material Retrieval: Wait for internal temperature ≤40℃, retrieve materials with high-temperature gloves. Use rapid cooling function (if available) cautiously for heat-sensitive materials.
6. Shutdown & Finalization: Turn off main power, clean inner chamber, drain water tank (if equipped). Complete operation log (equipment No., parameters, materials, duration).
III. Professional Precautions
Precision maintenance: Calibrate probes 1–2 times/year; replace sealing strips to avoid cold air leakage.
Safety taboos: No flammable, explosive, corrosive materials; no door opening during operation (except door-open constant temperature models); no unauthorized disassembly—contact professional maintenance for faults.
Maintenance: Clean air ducts/heat vents, inspect blower motor; descale humidification tank/tray. Disconnect power, keep dust-free and dry for long-term storage.
Special applications: For ≥200℃, confirm material temperature resistance; for vacuum models, check vacuum/sealing, release pressure slowly to avoid material damage.
Summary
Core principles: accurate setting, strict monitoring, standardized maintenance. Follow procedures for precision and safety. Adjust per manual for different brands/models.
In precision manufacturing fields such as electronics, semiconductors, and aerospace, industrial vacuum ovens are by no means simple "heating equipment". Instead, they have become core equipment for ensuring product quality by virtue of their ultimate control over the environment. Their performance advantages always revolve around "precision temperature control and efficient drying in a vacuum environment", which directly determine the reliability and qualification rate of downstream products.
I. Vacuum Performance: From Environmental Control to Quality Assurance
Vacuum degree is the core indicator of industrial vacuum ovens, which is directly related to drying efficiency and material safety. High-quality equipment can usually achieve a high vacuum degree below 10Pa, and some semiconductor-specific models can even reach the level of 1Pa. This performance brings dual values:
Oxidation Prevention in Low-Oxygen Environment: The oxygen content is greatly reduced in a vacuum state, which effectively prevents heat-sensitive and oxidizable materials (such as positive and negative electrode materials of lithium batteries, precision metal components) from oxidative discoloration and performance degradation during the heating process. It is particularly suitable for the processing of high-strength alloy components in the aerospace field.
Boiling Point Reduction to Accelerate Drying: The vacuum environment significantly lowers the boiling point of solvents. For example, the boiling point of water is only about 55℃ under a vacuum of -0.098MPa, which can quickly remove moisture or organic solvents inside the material at low temperatures. This solves the problem of "surface crusting and internal dampness" in traditional hot air drying, and is especially suitable for moisture removal of electronic components before packaging.
It is worth noting that the stability of the vacuum system is also crucial. Ovens equipped with high-quality vacuum pumps and pressure sensing devices can realize real-time monitoring and automatic compensation of vacuum degree, avoiding process failure caused by vacuum leakage.
II. Temperature Control Performance: Dual Perfection of Precision and Uniformity
The strict temperature requirements in industrial production have promoted the upgrading of vacuum ovens from "rough heating" to "precision temperature control". Their core performance is reflected in two aspects: temperature control precision and temperature uniformity:
1. High-Precision Temperature Control: Equipment adopting a PID closed-loop temperature control system can achieve a temperature control precision of ±1℃, and some high-end models even realize a fluctuation control of ±0.5℃. This precision ensures that the processing conditions of each batch of materials are completely consistent in mass production. For example, in the semiconductor chip packaging process, it can accurately control the melting and solidification temperature of the solder to avoid cold soldering problems.
2. Whole-Domain Temperature Uniformity: Through the distributed layout of multiple heating tubes and the optimized design of hot air circulation, the temperature dead zones in the oven are effectively eliminated. The temperature difference between various points in the working chamber is usually ≤±3℃. For special-shaped materials such as large-area PCB boards and photovoltaic modules, a uniform temperature field can avoid deformation caused by local stress concentration.
III. Efficiency and Adaptability: Meeting Industrial Production Needs
The high productivity requirements in industrial scenarios require vacuum ovens to balance efficiency and flexibility while ensuring performance:
• Rapid Temperature Rise and Fall: Equipment equipped with stainless steel heating tubes and high-efficiency thermal insulation layers can achieve a heating rate of 5-10℃/min. During the cooling stage, the combination of vacuum bubble breaking and forced air cooling greatly shortens the processing time of a single batch, adapting to the fast-paced production in the electronics industry.
• Multi-Specification Adaptability: From small laboratory-level chambers (below 50L) to large tunnel-type vacuum ovens for production lines (with a volume of over 1000L), selections can be made flexibly according to material sizes. Some equipment also supports customized layered shelves and explosion-proof designs to meet the needs of special industries such as chemical engineering and military industry.
IV. Stability and Intelligence: Invisible Guarantee for Industrial Production
In continuous production, the stability of equipment directly affects productivity. Modern industrial vacuum ovens are generally equipped with:
• Multiple Safety Protections: Devices such as over-temperature alarms, abnormal vacuum shutdown, and door lock interlock avoid safety accidents caused by operational errors.
• Intelligent Control: The touch screen operation interface supports process parameter storage (10-20 groups of formulas can be preset). Some models can be connected to the MES system to realize real-time upload and remote monitoring of production data, reducing the cost of manual intervention.
In conclusion, the core performance of industrial vacuum ovens lies in "achieving a precise balance between temperature and efficiency based on a vacuum environment". In today's era where precision manufacturing is increasingly dependent on process stability, selecting a vacuum oven that adapts to one's own productivity and material characteristics is not only the key to improving product quality, but also an important part for enterprises to build core competitiveness.
As core industrial equipment for precise temperature control, drying and curing, precision ovens’ operational stability directly impacts product quality and production efficiency. Scientific maintenance extends service life and ensures process parameter accuracy. Below are key methods divided into daily basic maintenance and regular in-depth maintenance.
I. Daily Basic Maintenance: Safeguard Fundamental Operation
Daily maintenance, the first line of stable operation defense, is performed before startup, during operation and after shutdown—simple yet critical.
1. Comprehensive Cleaning: Eliminate Impurities
Wipe the oven cavity, shelves and door seal daily to remove debris, dust, cured stains or oil. Use neutral detergent and a clean cloth to avoid cavity corrosion. Regularly clean the exterior and heat dissipation holes for unobstructed heat dissipation.
2. Parameter & Safety Checks: Ensure Accuracy and Safety
Verify that temperature controller, timer and other parameters match process requirements before startup, and check for stable display without drift. Inspect door interlock sensitivity, power cords, heating tube terminals and cooling fan for abnormalities. Confirm emergency stop buttons and over-temperature protection devices function properly to eliminate hidden dangers.
3. Standardized Operation: Reduce Human-induced Wear
Avoid overloading workpieces and ensure proper spacing for hot air circulation to prevent local overheating. Follow the manual for temperature rise/drop—no sudden startup/shutdown or drastic adjustments to avoid furnace cracking. Turn off main power only when temperature drops below 50℃ to extend heating element life.
II. Regular In-depth Maintenance: Enhance Core Performance
Recommended monthly or quarterly, regular maintenance focuses on core components and requires professional technicians.
1. Heating & Circulation System Overhaul: Ensure Efficiency
Inspect heating tubes for oxide layers, scale or abnormal resistance (replace if needed), and clean/fasten junction box terminals with insulating grease. Disassemble fan impellers to remove dust and oil, lubricate bearings, replace damaged seals and adjust air duct baffles for uniform hot air circulation.
2. Temperature Control Calibration: Improve Accuracy
Calibrate temperature sensors with a standard thermometer—adjust parameters or replace sensors if deviation is excessive. Inspect signal transmission lines for interference or poor contact. Verify multi-stage heating curve accuracy for programmable ovens.
3. Furnace Structure Maintenance: Extend Service Life
Check insulation layers for damage and refill insulation material if heat dissipation is abnormal. Replace aged or deformed door seals. Repair the cavity’s high-temperature resistant coating to prevent rusting.
Why Should You Evacuate Before Heating in a Vacuum Drying Oven？
1) Protect the Vacuum Pump：
If you heat the oven before evacuating, the heated air will be drawn out by the vacuum pump. This process transfers heat to the pump, potentially causing it to overheat. Overheating can reduce the efficiency of the vacuum pump and may even damage it.
2) Preventing Damage to the Vacuum Gauge:
If heating the oven first, heated air would directed toward the Vacuum Gauge and cause this instrument to overheat. If the temperature exceeds the gauge's operational limits, it may lead to inaccurate readings or permanent damage.
3)Avoiding Safety Hazards:
The tested material is placed in the vacuum chamber that can remove extracted gases from the material. If the tested material is heated first, the gas will expand when it encounters heat. Due to the excellent sealing of the vacuum chamber, the immense pressure generated by the expanding gas could cause the tempered glass of the observation window to shatter.
The correct procedure is to evacuate air first and then heat. If the vacuum level drops after reaching the desired temperature, you can briefly re-evacuate. This method helps extend the lifespan of the equipment.
Conclusion:
To ensure safety, maintain equipment efficiency, and prolong the lifespan of vacuum drying oven, always follow the correct procedure: evacuate air first, then heat. This simple step can prevent potential hazards and costly damages.
Burn-in Testing
Burn-in testing is the process by which a system detects early failures in semiconductor components (infant mortality), thereby increasing a semiconductor component reliability. Normally burn-in tests are performed on electronic devices such as laser diodes with an Automatic Test Equipment laser diode burn-in system that runs the component for an extended period of time to detect problems.
A burn-in system will use cutting-edge technology to test the component and provide precision temperature control, power and optical (if required) measurements to ensure the precision and reliability required for manufacturing, engineering evaluation, and R&D applications.
Burn-in testing may be conducted to ensure that a device or system functions properly before it leaves the manufacturing plant or to confirm new semiconductors from the R&D lab are meeting designed operating requirements.
It is best to burn-in at the component level when the cost of testing and replacing parts is lowest. Burn-in of a board or an assembly is difficult because different components have different limits.
It is important to note that burn-in test is usually used to filter out devices that fail during the “infant mortality stage” (beginning of bathtub curve) and does not take into count the “lifetime” or wearout (end of the bath tub curve) – this is where reliability testing comes into play.
Wearout is the natural end-of-life of a component or system related to continuous use as a result of materials interaction with the environment. This regime of failure is of particular concern in denoting the lifetime of the product. It is possible to describe wearout mathematically allowing the concept of reliability and, hence, lifetime prediction.
What Causes Components to Fail During Burn-in?
The root cause of fails detected during burn-in testing can be identified as dielectric failures, conductor failures, metallization failures, electromigration, etc. These faults are dormant and randomly manifest into device failures during device life-cycle. With burn-in testing, an Automatic Test Equipment (ATE) will stress the device, accelerating these dormant faults to manifest as failures and screen out failures during the infant mortality stage.
Burn-in testing detects faults that are generally due to imperfections in manufacturing and packaging processes, which are becoming more common with the increasing circuit complexity and aggressive technology scaling.
Burn-in Testing Parameters
A burn-in test specification varies depending on the device and testing standard (military or telecom standards). It usually requires the electrical and thermal testing of a product, using an expected operating electrical cycle (extreme of operating condition), typically over a time period of 48-168 hours. The thermal temperature of the burn-in test chamber can range from 25°C to 140°C .
Burn-in is applied to products as they are made, to detect early failures caused by faults in manufacturing practice.
Burn In Fundamentally performs the following:
Stress + Extreme Conditions + Prolong Time = Acceleration of “Normal/Useful life”
Types of Burn-in Tests
Dynamic Burn-in : the device is exposed to high voltage and temperature extremes while being subjected to various input stimuli .
A burn-in system applies various electrical stimuli to each device while the device is exposed to extreme temperature and voltage. The advantage of dynamic burn-in is its ability to stress more internal circuits, causing additional failure mechanisms to occur. However, dynamic burn-in is limited because it cannot completely simulate what the device would experience during actual use, so all the circuit nodes may not get stressed.
Static Burn-in : Device under test (DUT) is stressed at elevated constant temperature for an extended period of time.
A burn-in system applies extreme voltage or currents and temperatures to each device without operating or exercising the device. The advantages of static burn-in are its low cost and simplicity.
How is a Burn-In Test Performed?
The semiconductor device is placed onto special Burn-in Boards (BiB) while the test is executed inside special Burn-in Chamber (BIC).
Know more about Burn-in Chamber（Click here）
Burn-in Chamber
A burn-in chamber is an environmental oven used to evaluates the reliability of multiple semiconductor devices and performs large capacity screenings for premature failure (infant mortality). These environmental chambers are designed for static and dynamic burn-in of integrated circuits (ICs) and other electronic devices such as laser diodes.
Selecting Chamber Size
The chamber size depends on the size of the burn-in board, the number of products in each burn-in board, and the number of batches required per day to meet production requirements. If the interior space is too small, insufficient space between parts results in poor performance. If it is too large, space, time and energy are wasted.
Companies that are purchasing a new burn-in set-up should work with the vendor to ensure the heat source has enough steady-state and maximum capacity to match the load for the DUT.
When using forced recirculating airflow, parts benefit from spacing, but the oven can be loaded more densely vertically because airflow is distributed along the entire side wall. Parts should be kept 2-3 inches (5.1 – 7.6cm) from the oven walls.
Burn-in Chamber Design Specs
Temperature Range
Depending on the requirements of the Device Under Test (DUT) select a chamber that has a dynamic range such as 15°C above ambient to 300°C (572°F)
Temperature Accuracy
It is important that the temperature does not fluctuate. Uniformity is the maximum difference between the highest and lowest temperatures in a chamber at a specified setting. A specification of at least 1% setpoint for uniformity and 1.0°C control accuracy is acceptable in most semiconductor burn-in applications.
Resolution
A high-temperature resolution of 0.1°C will provide the best control to meet burn-in requirements
Environmental Savings
Consider a burn-in chamber that has a refrigerant that has a zero ozone layer depletion coefficient. Burn-in chambers with refrigeration are related to chambers operating in temperatures below 0 degrees Celsius down to – 55°C.
Chamber configuration
The chamber can be designed with card cages, card-slots, and access doors to simplify connecting DUT boards and driver boards with ATE stations.
Chamber Air Flow
In most cases a forced convection oven with recirculating airflow will provide the best distribution of heat and significantly speeds the time-to-temperature and heat transfer to parts. Temperature uniformity and performance depends on a fan design that directs air to all areas of the chamber.
The chamber can be design with a horizontal or vertical airflow. It is important to know the direction of inserting the DUT based on the airflow of the chamber.
Custom ATE Wiring
When it comes to measuring over hundreds of devices, inserting wires through an aperture or test hole may not be practical. Custom wiring connectors can be mounted directly to the oven to facilitate the electrical monitoring of the device with an ATE.
How A Burn-in Oven Controls Temperature
The burn-in oven uses a temperature controller executing a standard PID (proportional, integral, derivative) algorithm. The controller senses the actual temperature value versus the desired setpoint value, and issues corrective signals to the heater calling for application ranging anywhere from no heat to full heat. A fan is also used to equalize the temperature through the chamber.
The most common sensor used for accurate temperature control of the environmental oven is a Resistance Temperature Detector (RTD) which a platinum-based unit typically referred to as a PT100.
Sizing The Chamber
If you are using an existing oven, basic thermal modelling based on factors such as the oven’s thermal capacity and losses, heat-source output, and DUT mass will allow you to verify that the oven and heat source are sufficient to reach desired temperature with a thermal time constant short enough for tight loop response under the controller’s direction.
High Temperature Aging Cabinet
High temperature aging cabinet is a type of aging equipment used to remove early failure of non-conforming product parts.
Use of temperature aging cabinet, aging oven:
This test equipment is a test equipment for aviation, automobile, home appliances, scientific research and other fields, which is used to test and determine the parameters and performance of electrical, electronic and other products and materials after temperature environment changes in high temperature, low temperature, alternating between temperature and humidity or constant temperature and humidity.
The chamber of the test equipment is sprayed with steel plate after treatment, and the spray color is optional, generally beige. SUS304 mirror stainless steel is used in the inner room, with a large window tempered glass, real-time observation of internal aging products.
Features of temperature aging cabinet, aging oven:
1. PLC processing industry touch screen programming combination control, balanced temperature control system: aging specimen room temperature rise start the ventilation fan, balance the sample heat, aging cabinet is divided into product area and load area
2. PID+SSR temperature control system: according to the temperature change in the specimen box, the heat of the heating tube is automatically adjusted to achieve the temperature balance, so that the heating heat of the system is equal to its heat loss and achieve the temperature balance control, so it can run stably for a long time; The fluctuation of temperature control is less than ±0.5℃
3. The air transport system is composed of three-phase asynchronous electronic multi-wing wind wheel and wind drum. The wind pressure is large, the wind speed is uniform, and the uniformity of each temperature point is met
4. High precision PT100 platinum resistance for temperature acquisition, high accuracy for temperature acquisition
5. Load control, the load control system provides ON/OFF control and timing control two functional options to meet the different test requirements of the product
(1)ON/OFF function introduction: The switch time, stop time, and cycle times can be set, the test product can be switched according to the setting requirements of the system, the stop cycle control, the aging cycle number reaches the set value, the system will automatically sound and light prompt
(2) Timing control function: the system can set the running time of the test product. When the load starts, the product power supply starts timing. When the actual timing time reaches the time set by the system, the power supply to the product is stopped
6. System operation safety and stability: The use of PLC industrial touch screen control system, stable operation, strong anti-interference, convenient program change, simple line. Perfect alarm protection device (see protection mode), real-time monitoring of the operating status of the system, with the function of automatic maintenance of temperature data during operation, in order to query the temperature historical data when the product is aging, the data can be copied to the computer through the USB interface for analysis (format is EXCEL), with historical data curve display function, It intuitively reflects the temperature change in the product area during the product test, and its curve can be copied to the computer in BMP format through the USB interface, so as to facilitate the operator to make the test product report. The system has the function of fault query, the system will automatically record the alarm situation, when the equipment fails, the software will automatically pop up the alarm screen to remind the cause of the fault and its solution; Stop the power supply to the test product to ensure the safety of the test product and the equipment itself, and record the fault situation and occurrence time for future maintenance.
Semiconductor Chip-Car Gauge Chip
A new energy vehicle is divided into several systems, MCU belongs to the body control and vehicle system, is one of the most important systems.
MCU chips are divided into 5 levels: consumer, industrial, vehicle gauge, QJ, GJ. Among them, the car gauge chip is the current vane product. So what does the car gauge chip mean? From the name, it can be seen that the car gauge chip is the chip used in the car. Different from ordinary consumer and industrial chips, the reliability and stability of the car gauge chip is extremely important, so as to ensure the safety of the car at work.
The certification standard of the car gauge level chip is AEC-Q100, which contains four temperature levels, the smaller the number, the higher the level, the higher the requirements for the chip.
It is precisely because the requirements of the car gauge chip are so high, it is necessary to carry out a strict Burn In test before the factory, BI test requires the use of professional BI oven, our BI oven can meet the BI test of today's car gauge chip.
Connect the EMS system, so that each batch of baked chips can be traced at any time. High temperature and low temperature vacuum anaerobic environment, real-time monitoring of baking curve to ensure baking safety and effect.
Burn-in Oven
Burn-in is an electrical stress test that employs voltage and temperature to accelerate the electrical failure of a device. Burn-in essentially simulates the operating life of the device, since the electrical excitation applied during burn-in may mirror the worst-case bias that the device will be subjected to in the course of its useable life. Depending on the burn-in duration used, the reliability information obtained may pertain to the device's early life or its wear-out. Burn-in may be used as a reliability monitor or as a production screen to weed out potential infant mortalities from the lot.
Burn-in is usually done at 125 deg C, with electrical excitation applied to the samples. The burn-in process is facilitated by using burn-in boards (see Fig. 1) where the samples are loaded. These burn-in boards are then inserted into the burn-in oven (see Fig. 2), which supplies the necessary voltages to the samples while maintaining the oven temperature at 125 deg C. The electrical bias applied may either be static or dynamic, depending on the failure mechanism being accelerated.
Figure 1. Photo of Bare and Socket-populated Burn-in Boards
The operating life cycle distribution of a population of devices may be modeled as a bath tub curve, if the failures are plotted on the y-axis against the operating life in the x-axis. The bath tub curve shows that the highest failure rates experienced by a population of devices occur during the early stage of the life cycle, or early life, and during the wear-out period of the life cycle. Between the early life and wear-out stages is a long period wherein the devices fail very sparingly.
Figure 2. Burn-in ovens
Early life failure (ELF) monitor burn-in, as the name implies, is performed to screen out potential early life failures. It is conducted for a duration of 168 hours or less, and normally for only 48 hours. Electrical failures after ELF monitor burn-in are known as early life failures or infant mortality, which means that these units will fail prematurely if they were used in their normal operation.
High Temperature Operating Life (HTOL) Test is the opposite of ELF monitor burn-in, testing the reliability of the samples in their wear-out phase. HTOL is conducted for a duration of 1000 hours, with intermediate read points at 168 H and 500 H.
Although the electrical excitation applied to the samples are often defined in terms of voltages, failure mechanisms accelerated by current (such as electromigration) and electric fields (such as dielectric rupture) are understandably accelerated by burn-in as well.
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