Reliability Testing Random electronic product Vibration test It is an essential component of environmental stress screening (ESS), designed to simulate the vibration conditions encountered in real-world operating environments in order to identify and eliminate potential defects in products. The following provides a detailed analysis of random vibration test parameters for electronic products, along with relevant standard references.
a) Basic parameters of random vibration testing
The primary parameters of a random vibration test include the acceleration power spectral density (PSD), frequency range, test duration, and number of vibration axes. The settings of these parameters directly affect the validity of the test and the reliability of the product. Acceleration power spectral density represents the energy distribution per unit frequency, typically expressed in g²/Hz, and serves as a key metric for assessing the magnitude of stress in random vibration testing [1].
The selection of the frequency range should be based on the product’s actual operating environment and vibration characteristics, typically spanning 20–200,000 Hz. For random vibration testing, the frequency range must encompass the product’s principal resonant frequencies to ensure test validity. According to the recommendations in GJB 1032 and GJB/Z 34, the frequency range should extend at least from 100 to 1,000 Hz, ensuring that vibration is applied across a continuous spectrum and that appropriate spectral levels are achieved [2] [3].
b) Acceleration power spectral density (PSD)
PSD is a key parameter in random vibration testing, used to characterize the distribution of vibrational energy per unit frequency. A commonly adopted PSD value of 0.04 g²/Hz is recommended by the GJB 1032 standard, as it optimizes the elimination of early‑life failure rates while minimizing fatigue damage to the product [1].
 When selecting a PSD, it is essential to consider the product’s transportation environment and its actual operating conditions. For example, under air‑transport conditions, the root‑mean‑square value of random vibration acceleration is typically higher than that for road or rail transport, indicating a more severe environment. Accordingly, for different modes of transport—such as air, sea, or truck—it is necessary to choose an appropriate PSD standard to ensure that the test conditions are neither overly stringent nor compromised in validity [4].
c) Vibration time and axial selection
 Vibration duration typically ranges from 5 to 20 minutes, depending on the product’s complexity and the test objectives. According to GJB 1032, the vibration time for each individual axis should not exceed 20 minutes to prevent unnecessary fatigue damage to the product [5].
The selection of vibration axes should be based on the product’s physical structure and the layout of its internal components. In most cases, vibrating along a single axis is sufficient; however, when the product exhibits high sensitivity to vibrations in different directions, additional vibration axes may be required. For instance, for products with complex structures, it may be necessary to apply vibrations in two or three directions to more comprehensively simulate real-world operating conditions [5].
d) Standards for Random Vibration Testing
 In random vibration testing, commonly used standards include GJB 1032, ASTM D4169, ISTA 2A, and ISO 13355. These standards provide detailed guidance on test parameters for various products and transportation environments, ensuring the suitability and effectiveness of the tests [4].
For example, the GJB 1032 standard is particularly applicable to military electronic products, specifying detailed vibration spectra and vibration magnitude values to ensure that early‑life failures are screened out while preventing damage to the product. The standard recommends a vibration spectrum of 0.04 g²/Hz and an acceleration root-mean-square value of 6.06 g, which are considered ideal conditions for effective product screening [1].
e) Test equipment and condition control
 During random vibration testing, the shaker’s excitation force must be sufficient to meet the weight requirements of the test article, thereby ensuring both the accuracy and safety of the test. According to relevant studies, the required excitation force should equal the product of the loaded mass and the maximum test acceleration; the loaded mass includes the shaker’s own weight, the fixture weight, and the product weight [6] [7].
 During the testing process, test parameters must be closely monitored to ensure compliance with standard requirements. According to GJB/Z 34, both the allowable deviation of the test temperature and the allowable deviation of the random vibration parameters must remain within specified limits to guarantee the reliability and consistency of the test results [7].
In summary, random vibration testing of electronic products, by appropriately setting the acceleration power spectral density, frequency range, test duration, and vibration axes, can effectively identify and eliminate latent defects, thereby enhancing product reliability. The selection of test parameters should be guided by the product’s actual operating environment and applicable standards to ensure both the effectiveness and cost-efficiency of the test.
Academic Outline
Random Vibration Test Parameters
The frequency range is typically 20–2000 Hz [2] [8]
 Trapezoidal spectrum with a power spectral density of 0.04g²/Hz [8] [9]
 Vibration time: 5–15 minutes [8] [9]
 The actuation axis can be selected as either a single axis or three orthogonal axes [8] [10]
Temperature cycling test parameters
The temperature range is determined by the product’s operating temperature limits [8] [11]
 Heating rate of 5°C/min [8] [11]
Perform 10 to 20 repetitions [8] [9]
 The holding time at high and low temperatures is selected based on the product’s complexity [12]
 Screening Procedures and Criteria
 Screening includes initial performance testing, defect‑removal trials, fault‑free verification, and final performance testing [8] [9]
 Stress screening is performed first with random vibration, followed by thermal cycling [9] [13]
The no‑fault test involves temperature cycling followed by random vibration [9] [13].
 Principles for Selecting Stress Screening Conditions
The selection of the screening stress should be based on the principle of not exceeding the product’s design limits [11].
The stress conditions should be capable of activating latent defects without damaging the sound portions [11]
 Temperature cycling and random vibration are commonly used screening stresses [13] [14]
Requirements for Random Vibration Testing Equipment
The shaker must achieve an acceleration of 70 g, with a frequency sweep range of 0–2000 Hz [2].
 The vibration test fixture must not exhibit any resonant frequencies within the vibration frequency range [7].
Precautions for the Experiment
 Electrical testing must be performed concurrently with the application of stress [11]
The selection of stress conditions should be tailored to the specific characteristics of the product and its actual requirements [11] [13].
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