Scope 1.1 This section specifies the verification items, main instruments and requirements for verification, verification conditions, number and placement of measurement points, verification steps, data processing, and verification results of low-temperature/low-pressure/humid heat comprehensive sequential testing equipment during periodic verification. 1.2 This section is applicable to the periodic verification of the testing equipment used in GB/T 2423.27-2005 "Basic Environmental Testing Regulations for Electrical and Electronic Products - Test Z/AMD; Low Temperature/Low Air Pressure/Wet Heat Continuous Comprehensive Test Method". This section is also applicable to the periodic verification of similar testing equipment. The clauses in the following documents are referred to as clauses in this part of GB/T 5170 through normative references. For dated reference documents, all subsequent amendments (excluding errors) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T 2423.27-2005 Basic Environmental Testing for Electrical and Electronic Products - Part 2: Test Methods, Test Z/AMD: Low Temperature/Low Air Pressure/Humidity Heat Continuous Comprehensive Test (IEC 60068-2-39; 1976, IDT) GB/T 5170.1-1995 Basic Parameter Verification Methods and General Provisions for Environmental Testing Equipment for Electrical and Electronic Products - GB/T 6999 Relative Humidity Check Table for Environmental Testing - Verification Items - The verification items specified in this part are as follows: - Cooling rate and temperature deviation-- Depressurization rate; Comprehensive verification of temperature deviation and pressure deviation; -- Heating time, boosting time, and humidification time; -- Temperature and relative humidity-- Wind speed. 4. Main instruments and requirements for calibration 4.1 Temperature measurement instruments shall be a temperature measurement system composed of platinum resistors, thermocouples, or other temperature sensors. The expanded uncertainty of the temperature measurement system (k=2) shall not exceed 0.4 ℃; The thermal time constant of the sensor: 20 s~40 s. 4.2 The low-pressure measuring instrument adopts a pressure gauge (gauge) with an expanded uncertainty (k-2) of no more than 1/3 of the allowable deviation of the measured pressure. 4.3 The relative humidity measurement instrument adopts a dry wet bulb thermometer or a humidity measurement system composed of other sensors, and the expanded uncertainty (k=2) of the humidity measurement system shall not exceed 1/3 of the allowable deviation of the measured humidity
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