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low pressure test
The low-pressure test chamber for radio and television metrology covers a temperature range of -70 ℃ to 150 ℃ and a pressure range of 0.2kPa to 101kPa
Product details
Low pressure test is a simulation of high-altitude atmospheric pressure environment using equipment to determine the adaptability of components, equipment or other products for storage, transportation or use under low pressure conditions.
Radio and television metrology has multiple sets of low-pressure test chambers, which can carry out simple low-pressure experiments, low-pressure temperature comprehensive experiments, and low-pressure gas temperature humidity comprehensive experiments.
Qualification and Capability:
Recognized by CNAS and CMA.
Scope of application:
Low pressure testing can be conducted for electronic, instrumentation, automotive, and aerospace products' components, structural parts, assemblies, and complete machines.
Testing standards:
GB2423.27-2005，IEC60068-2-39-1976，GB2423.42-1995，GB2423.102-1995，GB2423.26-2008，IEC60068-2-41-1976，GB2423.21-2008，IEC60068-2-13-1983 Wait.
Experimental project:
1. Simple low-pressure experiment.
During the trial, the following pressures should be maintained, with an allowable difference of no more than ± 5% or ± 0.1kPa (whichever is greater), and an allowable difference of ± 2kPa at the 84kPa level. As shown in the table below.
| air pressure | Allowable deviation of test air pressure | Approximate altitude (h) | ||
| kPa | mbar | kPa | mbar | |
| 1 | 10 | ±0.1 | ±1 | 31200 |
| 2 | 20 | 26600 | ||
| 4 | 40 | ±5% | 22100 | |
| 8 | 80 | 17600 | ||
| 15 | 150 | 13600 | ||
| 25 | 250 | 10400 | ||
| 40 | 400 | ±2 | ±20 | 7200 |
| 55 | 550 | 4850 | ||
| 61.5 | 615 | 4000 | ||
| 70 | 700 | 3000 | ||
| 79.5 | 795 | 2000 | ||
| 84 | 84 | / | ||
2. Low pressure temperature comprehensive test
Table 1 Preferred combinations of temperature, air pressure, and duration
| Temperature (℃) | air pressure | Duration (h) | |
| kPa | mbar | ||
| 155 | 4 | 40 | 2 |
| 85 | 4 | 40 | 2 |
| 155 | 15 | 150 | 2 |
| 85 | 15 | 150 | 2 |
| 55 | 15 | 150 | 2 |
| 55 | 25 | 250 | 2 |
| 55 | 40 | 40 | 2 |
| 55 | 55 | 550 | 2；16 |
| 55 | 70 | 700 | 2；16 |
| 40 | 55 | 550 | 2 |
3. Low pressure temperature humidity comprehensive test
The temperature humidity altitude test conditions and steps are as follows:
a) Conduct initial testing on the test sample under normal atmospheric conditions in the laboratory;
b) Power off the test sample and place it in the test chamber to simulate its actual installation and usage status as much as possible;
c) Change to cold/dry - the test sample does not work, adjust the temperature of the test chamber from room temperature to -55 ℃ within 40 minutes;
d) Cold/dry soaking - the test sample does not work and is kept at a temperature of -55 ℃ for 4 hours;
e) Cold/dry temperature rise - energize the test sample with a minimum operating voltage of 18VDC to make it work, and then raise the temperature inside the test chamber to -40 ℃ within 10 minutes;
f) Cold/dry performance check - immediately observe whether there are any faults in the testing software interface after completing step e);
g) Change to cold/dry height - maintain the working state of the test sample and reduce the pressure of the test chamber from laboratory pressure to 41.06 kPa (corresponding to a height of 7000 m) within 10 minutes;
h) Cold/dry height - maintain the temperature inside the test chamber at -40 ℃ and pressure at 41.06kPa for 30 minutes;
i) Change to temperature/humidity - Within 1 hour, raise the temperature inside the test chamber to 32 ℃, increase the pressure to laboratory pressure, and change from uncontrolled humidity to relative humidity to 95%;j) Temperature/Humidity Maintenance - Maintain the temperature inside the test chamber at 32 ℃, laboratory air pressure, and relative humidity of 95% for 30 minutes;
k) Change to hot/dry - adjust the power supply voltage to 30VDC, raise the temperature inside the test chamber to the maximum working temperature of 70 ℃ within 1 hour, and reduce the relative humidity to 25%;
l) Hot/dry soaking - maintain the temperature of 70 ℃ and relative humidity of 25% in the test chamber for 2 hours;
m) Hot/dry performance check - immediately observe whether there are any faults in the testing software interface after completing step l);
n) Change to hot/dry height - reduce the pressure inside the test chamber from laboratory pressure to 41.06 kPa within 10 minutes;
o) Hot/dry height - maintain the temperature in the test chamber at 70 ℃, pressure at 41.06kPa, and relative humidity at 25% for 4 hours;
p) Hot/dry height performance check - immediately observe whether there are any faults in the testing software interface after completing step o);
q) Change to laboratory environmental conditions - Within 30 minutes, restore the temperature of the test chamber from 70 ℃ and the pressure from 41.06kPa to normal atmospheric conditions in the laboratory, without controlling humidity. After the change is complete, the test sample stops working;
r) Steps c) to q) are a complete cycle, and the experiment is conducted for a total of 10 cycles;
s) After 10 cycles of testing, the test sample is allowed to return to a stable state under normal atmospheric conditions in the laboratory for final testing.
Photo:
Figure 1 Appearance of Low Pressure Temperature Comprehensive Test Chamber Figure 2 Appearance of Low Pressure Temperature Humidity Comprehensive Test Chamber
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