JB/T 4278.7-2011 "Rubber plastic Wire and cable test equipment method of verification. Part 7: Constant temperature water bath" standard specifies the verification items and technical requirements of constant temperature water bath equipment, verification equipment, method of verification and verification results processing. This standard applies to the verification of the working area of the constant temperature water bath in the Wire and cable test. During the verification process, Thermocouple sets, DC digital voltmeters, Thermocouple switch and other appliances that meet the requirements of the specification need to be used, and operate according to the Measuring method described in the standard to ensure the temperature Stability and Accuracy of the measured area. In addition, the standard also clarifies the specifications for the use of constant temperature water bath equipment and related technical requirements to ensure the Reliability and accuracy of the equipment in practical applications.