To ensure the electrical, mechanical and thermodynamic integrity of constant temperature and humidity test chambers (hereafter “the chamber”), to standardize operating procedures, and to reduce failure and accident rates, this instruction is established. It applies to all programmable, single-point and walk-in chambers that are newly purchased, in service or relocated.

Salt-spray cabinets artificially intensify corrosive agents so that months or even years of marine or industrial atmospheric attack are reproduced within a few hours or days. This paper systematically describes the working mechanism of the equipment, the control logic of its critical parameters, and the quantitative correspondence between test results and natural exposure. The aim is to provide industry with the technical basis for tailoring test programmes to specific products.

In the aerospace, automotive, home-appliance and materials-science sectors, products must routinely undergo prolonged and repeatable exposure within the −80 °C to 0 °C range to verify functional integrity and service life under extreme cold. Nature cannot supply a continuous, controllable and stable sub-zero environment; consequently, low-temperature test chambers are employed to create an artificial cryogenic duty.

With the continuous updating of GB/T 4208-2017, IEC 60529:2013, MIL-STD-810H and other domestic and international protection-class standards, “rain testing” has evolved from a simple “water-proof check” into a systematic evaluation covering sealing reliability, material weatherability, structural integrity, electronic compatibility and more.

During the past twelve months, several third-party testing bodies and OEM laboratories reported the same problem: when running dust tests in accordance with GB/T 4208, IEC 60529 or MIL-STD-810, the batch cycle has stretched from 48 h to 72 h, even 96 h, while energy consumption has risen by more than 30 %.

In generic reliability standards such as GB/T 2423, IEC 60068 and MIL-STD-810, “damp heat” is treated as an independent climatic stress. The goal is not merely to verify moisture resistance, but to accelerate and expose failure modes triggered by water adsorption, condensation, “breathing” and electrochemical migration.

This guide regulates the daily start-up/shut-down, parameter setting, sample loading, process monitoring and maintenance of laboratory constant-temperature and humidity test chambers (hereafter “the chamber”), ensuring personnel safety, equipment reliability and data traceability.

In the field of environmental reliability testing, thermal shock test chambers are widely used to evaluate the adaptability and lifetime degradation of electronic components, materials, and complete products under rapid and extreme temperature transients.

In an era of vigorous development of artificial intelligence technology, intelligent control has become an indispensable component of rain test chambers. This technological innovation not only significantly reduces labor costs but also plays a pivotal role in improving equipment operating efficiency.

To establish a standardized and quantifiable daily maintenance process, reduce unexpected downtime, extend the equipment’s economic life cycle, and guarantee the traceability of temperature and humidity values.