MIL STD 810H 500.6 Low Pressure Altitude Test Machine

MIL STD 810H 500.6 low pressure altitude test is a test that puts the test sample into the test room, then reduces the air pressure in the test area to the value specified by the relevant standard and maintains the specified duration of the test. Its purpose is mainly to determine the adaptability of components, equipment or other products to low-pressure environments during storage, transportation and use. This kind of test is suitable for products that are transported by air in the cargo hold of an aircraft, products used on plateaus and products that are transported by air when the pressure drops rapidly after the aircraft is injured.

The purpose of the MIL STD 810H 500.6 low pressure altitude test is to check the performance of the product in a low-pressure environment and the impact of rapid pressure drop on product performance. The test application is usually divided into transportation test and operation test environment test. The transportation environment usually uses low temperature and reduced air pressure as the verification condition, The operating environment uses high/low temperature with reduced air pressure as the verification condition.

MIL STD 810H 500.6 Low Pressure Altitude Test Machine

Equipment Model: MIL-STD-810H-500.6-LPATest Room Dimensions: 700x1700x700 mm
Temperature Range: -70℃ +150℃|-55℃ +150℃ LoadEquipment Appearance: 950x2400x2350 mm
Temperature Fluctuation: ≤ ±0.5℃Temperature Deviation: ≤ ±2.0℃
Temperature Distribution Uniformity ≤±2.0℃Humidity Range: 20%RH~98%RH
Humidity Fluctuation: ± 2.0% RH (at normal pressure)Humidity Uniformity: ±3.0%RH
Humidity Deviation: ±3.0%RH (Humidity> 75%RH)Humidity Deviation: ±5.0%RH (Humidity≤75%RH)
Cooling Rate: +0.7℃~ +1.0℃/minPressure Range: 101Kpa~1Kpa
Pressure Deviation: ≤4kPa, ±0.1kPaPressure Deviation: 4kPa~40kPa, ±0.5kPa
Pressure Deviation: ≥40kPa, ±2.0kPaDepressurization Rate: Normal Pressure to 1kPa ≤30min
Pressure Recovery: 10kPa/min, AdjustableNoise Level: ≤75 Db
Ambient Temperature: +5℃ ~ +35CEnvironmental Humidity: ≤85%RH (no frost)
Atmospheric Pressure: 86kPa ~ 106kPaPower Requirements:AC380 (1±10%) V (50±0.5) Hz

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Inner Test Room: 304 stainless steel fully welded inner tank, thickness ≥5mm. All gaps are seamlessly welded by TIG (tungsten arc inert gas arc welding) to ensure absolute sealing and no leakage|MIL STD 810H 500.6 Low Pressure Altitude Test MachineMachine Structure
External Machine Structure: The shell is spliced with sprayed cold-rolled steel plate to ensure long-term use. No rust, paint peeling, deformation, etc., and the thickness is less than or equal to 1.2mm. Cabinet color: RAL7035 white (Optional)
Including various components for control and related alarms, such as controller modules, fuses, motor starters, circuit breakers, contactors, relays, transformers, DC power supplies, etc.
Fully open single wing type, equipped with double-layer silicone rubber seal and door lock. The door’s effective size of Wewon’s low pressure test – altitude chamber: 700×700mm (width×height).
Reinforced profiles are pre-embedded inside the door panel, and stainless steel edging is designed around it to ensure that the door panel fits closely with the door frame.
A self-constant temperature heating zone is set on the inner edge of the gate, and the system automatically turns on the heating zone defrosting function according to the temperature in the test space.
The door is opened manually and pressed tightly by a door lock to prevent air leakage from the door. Each left side is equipped with 1 DN100mm vacuum flange, equipped with calipers and cover plate.
Standard configuration with 2 stainless steel plate punching parts shelf, load-bearing ≥30kg. LCD touch screen programmable controller, power switch, RS-232 communication interface.

Low Pressure (Altitude) Testing

The altitude vacuum test chamber from Wewon Environmental Chambers Co., Ltd. simulate different high-altitude environments at the same time when simulating temperature testing, ranging from atmospheric pressure to 43,000 meters high altitude. The same test space can be used to simulate temperature and humidity. We can also achieve rapid decompression from an altitude of 4550 meters to an altitude of 21,350 meters within 15 seconds.

The pressure transmitter detects the pressure in the working chamber, and compares the detected pressure signal with the set value of the control instrument after amplification, analog/digital conversion, and nonlinear compensation.Vacuum System
The resulting deviation signal controls the solenoid valve to open. Harmony, to keep the pressure of the studio within a certain range, adopt dynamic pressure balance method, Under the continuous working condition of the vacuum system, the control dynamic balance is realized.
The control system automatically controls the vacuum solenoid valve and the vacuum pump (including the inverter) according to the pressure setting value, and adjusts the amount of suction/intake to achieve the requirements of dynamic pressure balance.
The low air pressure altitude test chamber’s vacuum pump adopts the advantages of high-precision vacuum pumps made by Taiwan Kavic, such as fast pumping speed, high vacuum degree, reliability and durability. We use 2 sets of vacuum pump system + vacuum storage pressure tank system; 2 sets start at the same time when the pressure is reduced quickly, and 1 set starts at the rest of the time.
The vacuum is realized by the single-stage rotary vane pump of Taiwan Kaiweik, and the precise control of the pressure is realized by starting the on and off of the butterfly valve. Chuanbei vacuum accessories are selected to ensure the vacuum degree of the test room.
Choose Chuanbei vacuum accessories to ensure the vacuum of the test room. Use high-precision pressure sensor to accurately control pressure. Water-cooled magnetic fluid is used to ensure the reliability and tightness of the connection.

MIL-STD-810H 500.6 low pressure altitude test chambers are used in aviation, aerospace, military, information, electronics and other fields. Determine the environmental adaptability and reliability test of instruments and meters, electrical products, materials, parts and equipment under low air pressure, high temperature, low temperature single item or at the same time.

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The Dimension and Structure of Weson's MIL STD 810H 500.6 Low Pressure Altitude Test Machine

Since the 1960s, the U.S. Department of Defense has set standards for rugged device performance. Through a series of tests collectively known as MIL-STD-810G (Mil-Spec), manufacturers simulate how a mobile device will operate under a variety of extreme stressors and environmental conditions. These tests can be modified to fit the needs of a specific customer or industry, allowing manufacturers to choose the tests they want and then adjust parameters accordingly. Once a device is tested and meets certain MIL-STD-810G specifications, they are approved for use by departments and agencies of the United States Department of Defense, indicating they should meet the demands of mobile professionals in other challenging work environments.

MIL-STD-810G Test Change 1Description CommentWhy It Matters ?
Altitude|Method 500.6 Procedure I and IIA performance test is conducted on a device in an altitude chamber simulating 15,000 feet or more above sea level to test the performance of materials and systems under low pressure conditions under non-operating and operating conditionsWith the reduced atmosphere at 15,000 feet, it is much easier for vibrations to cause an impact between the needle and the platter. Workers collecting valuable data for mission-critical decisions in highaltitude locations can’t easily replace a failed device.
High Temperature|Method 501.6 Procedure I and IIAn operational test of the device is performed at 140°F for thirty minutes and non-operational at 160°F for 7 days.Mobile works need to trust that devices have the ability to survive and operate at extreme temperatures, whether it be hot or cold. On a 93° day, temperatures in a vehicle can reach 120°F in less than 40 minutes.
Low Temperature|Method 502.6 Procedure 1 and IIA device is placed in a -20°F environment for thirty minutes in the extreme cold while the unit is on and -60°F when the unit is off.This test validates that a device will operate at extreme winter conditions, without damaging the hard drive or experiencing data migration in an SSD.
Temperature Shock|Method 503.6 Procedure IA device goes through three cycles of testing where it is placed in an environment of 200°F then -60°F to test reliability when moving between extreme temperatures.Devices will rotate through one temperature extreme to another, to demonstrate screen readability and internal electronics will stay intact through thermal shock.
Blowing Rain Method|506.6 Procedure IA device is blasted with 5.8 inchesper-hour or more rain and 70 mph winds, for 30 minutes per surface while remaining operational.Few mission-critical workers can put their work on hold due to a rainstorm. This test simulates using the device in inclement weather or on a job site around water.
Humidity|Method 507.6 Procedure I and IIFor Procedure I a device is tested in 15 days cycle between 91°F at 80% relative humidity and 160°F at 14% relative humidity. For Procedure II, a device is tested in temperature cycles of 86°F to 140°F at 95% relative humidity.This test simulates how a unit might work outdoors in a humid environment or in many plant locations, demonstrating the ability to adapt to an extreme weather environment.
Sand and Dust|Method 510.6 Procedure I and IIDust and sand are blown at a device over several hours in an environment of 140°F.This test simulates situationslike desert sandstorms or dusty environments where unsealed devices may have internal components exposed and damaged due to contaminants.
Explosive Atmosphere|Method 511.6 Procedure IA device is placed in a sealed chamber with an explosive environment utilizing hexane in dry air. While in the chamber, the device is under pressure ranging from 1.50 PSIA to 14.30 PSIA at a temperature of approximately 140°F.In extreme field work in environments with explosive gases, this test validates the device will not cause ignition for the safety of those in the area.
Vibration|Method 514.7 Procedure I and IIThis test simulates the vibrations typically experienced in-flight or in an off road vehicle.Whether used in patrol cars, tanks, ambulances or helicopters, mobile devices need to reliably function in heavy vibration environments.
Transit Drop|Method 516.7 Procedure IVA device is dropped from various heights at 26 different angles onto 2-inch thick plywood over steel plate on concrete, and the height at which the unit will still turn on and operate is the rated drop specification.Drops are one of the most common causes of damage to business mobile devices and given their often nontraditional working environments, mobile workers are even more likely to drop their devices during the course of their day.

7″ color touch screen display, powerful programming control system, operation and data processing are more convenient and reliable, our controller has Windows appearance, easy to use, compatible with Ethernet, virtual network realizes access to equipment at any time and place .Multi-level data processing functions.Controller Features
Operation mode: program mode, fixed value mode. Program capacity: editable: 20 programs, each program has a maximum of 50 steps, and 20 cycles can be set (each cycle step is a maximum of 999 cycles)
Display Resolution: Temp 0.1℃, Time 0.1 minutes, Humidity 0.1%RH, air pressure: 10 Pa
Communication Function: RS-485 interface, with local and remote communication functions (centralized monitoring software, RS-485/RS-232 converter required, one COM port and one USB port of the PC are required); at most can be connected at the same time 16 devices, the maximum cumulative cable length is 800m
Failure alarm and cause, processing prompt function; Power failure protection function; Upper and lower limit temperature protection function; Timing function (automatic start and automatic stop operation), self-diagnosis function

deviation curve of actual pressure value and pressure setting value

The tests have been revised throughout the years (MIL-STD-810G Change 1 is the latest version) to reflect the ever-evolving needs of military personnel, and have become a common benchmark across the industry in validating whether or not a device can be considered “rugged.” MIL-STD-810G covers a variety of scenarios like drops and vibrations, extreme temperatures, high altitudes, water resistance and dust intake. For a truly durable mobile device that will survive mission-critical jobs, buyers should make sure a device has third-party validation of all Mil-Spec claims to ensure it will meet their performance needs.

The main controller adopts imported controller LCD screen, touch screen, respectively control pressure.Control System
Controller of altitude and atmosphere testing systems from Wewon Environmental Chambers Co., Ltd. direct display of temperature and pressure setting (SV) actual (PV) value.
It can display the execution program number, segment number, remaining time and cycle number, running time display.
Program editing and graphic curve display. With a separate program editing screen, each page can enter 4 segments of pressure and time.
Fixed-point or program action status display. Language switch can switch Chinese/English.
The amount of programs that can be used: 120 groups at most, one program can be combined from 1 to 100 segments, totaling 1200 segments.
Commands can be executed repeatedly: each command can be up to 999 times, and the program slope setting can be set by the time axis,
Each segment between programs can be set up to 99 hours and 99 minutes, and the minimum is one minute, which can be set for connection use.
The controller has the functions of editing, clearing, inserting, etc.,
There are 4 sets of time signal output control (can control the ON/OFF action of the test object).
With 9 groups of PID parameter settings, with skip and hold functions during program execution.
The screen can be adjusted for backlight, and the backlight time can be set,
The screen display protection function can be set to timed or manually closed, program copy, COPY, connection function, edit experiment title and other program editing functions.
PID automatic calculation and FUZZY control function,
The control system has the power-off program memory, automatically starts and continues to execute the program after the power is restored,
The control system has scheduled startup and shutdown functions, date and time adjustment functions, key and screen lock (LOCK) functions, and standby picture viewing functions.
Wewon’s altitude chambers for testing of temperature and low-pressure can be connected to the computer to display the curve and obtain the data.
USB read settings, Actual values and operating curves.
With battery-protected RAM, it can save the set value, sampling value and sampling time of the device; the maximum recording time is 60 days (when the sampling period is 1.5min)

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