Common environmental test chambers include: constant temperature and humidity test chambers, high and low temperature test chambers, cold and heat shock test chambers, and aging test chambers. When purchasing or using these devices, we must first understand some professional terms: (The following are the 14 professional terms we have summarized)
First, the test equipment volume: refers to the actual volume of the space defined by the inner wall of the environmental test chamber, than the table 80 liters, 100 liters, etc.
Second, the working space: refers to the environmental test chamber can maintain the specified test conditions within the specified deviation of the part of the space such as: how much you test the electronic products, how much to put at one time, etc.
Third, the test box stability: refers to the test box at any point in the workspace of its own changes in the performance of the device itself to meet the performance requirements of the state such as: can be stable in 50 minutes within 3 minutes, etc.
4. Temperature deviation: It refers to the temperature difference between the highest temperature and the lowest temperature and the nominal temperature measured at each measuring point of the working space under the steady state of the test chamber within the specified time. For example: ≤ 2°C
V. Relative humidity temperature difference: Refers to the upper and lower deviations of the maximum relative humidity and the minimum relative humidity and the nominal relative humidity measured by the measuring points of the working space within the specified time under the steady state of the test box. For example: +2~—-3%RH
Six, temperature fluctuation: refers to the steady state of the test chamber, in the specified time interval, the relative humidity of the working space at any point of time changes. For example: ±0.5°C
VII. Relative temperature fluctuation: refers to the change of relative humidity with time at any point in the working space within a specified time interval.
Eighth, temperature uniformity: refers to the maximum difference between the temperature of any two points of the working space at a certain moment in the steady state of the test box.
Calculation method, under steady state, within 30min of each measurement point of the working space, the arithmetic mean value between the highest temperature measured and the lowest temperature measured in each measurement.
Nine, relative humidity uniformity: refers to the test chamber at a steady state, the working space at any moment between any two points of maximum humidity difference.
Calculation method, under steady state, within 30min of each measurement point of the workspace, the arithmetic mean between the highest temperature measured and the lowest humidity measured in each measurement
X. Temperature change rate: refers to the transition rate between two specified temperatures measured at the geometric center point of the working space of the test chamber, expressed in °C/min.
XI. Average rate of change of temperature every 5 min The average rate of change of each specified temperature between the two specified temperatures measured at the geometric center of the test chamber working space is expressed in °C/min.
Twelve, pressure deviation test chamber in the steady state, the working space measurement point in the specified time measured the maximum pressure and the lowest pressure and the nominal pressure of the upper and lower deviations
XIII. Rate of change of barometric pressure Test chamber The geometric center point of the working space measured at the transition between the two specified barometric pressures in kPa/min.
XIV. Temperature Recovery Time After the steady state is reached at the specified temperature, the time required for the working space temperature to return to the original stable state after being placed in the load.
15. When the temperature overshoot device warms up or cools to the specified temperature, the actual temperature of the working space exceeds the allowable deviation range of the specified temperature.
After understanding these professional terms, they will not be ignorant when purchasing, and they will understand whether the performance of the entire equipment complies with some national standards in practice.
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