STH系列试验箱的高温部分制冷剂采用中温制冷剂，低温部分制冷剂是采用低温制冷剂，箱内温度能达到-7-15℃。控制系统是综合试验箱的核心，它决定了试验箱的升温速率，精度等重要指标。现在试验箱的控制器大都采用PID控制，也有少部分采用PID与模糊控制相组合的控制方式。恒温振荡器由于控制系统基本上属于软件的范畴，而且此部分在使用过程中，一般不会出现问题。加热系统：试验箱的加热系统相对制冷系统而言，是比较简单。
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电流：轴承转动时通电可能导致出现凹槽或刻痕。ntn轴承静止时，电气操作接地不当会导致轻微的烧伤；预防措施：在对ntn轴承以外的部件焊接前通过适当接地连接减少或避免电流通过轴承。外部材料：磨损性颗粒污染和碎片侵入可能导致ntn轴承工作面磨损、擦伤和凹陷；预防措施：清除侵入颗粒和碎片，更换润滑剂，检查密封系统。偏心：偏心、倾斜或过大负荷可能导致几何应力集中或表面剥落；预防措施：加工轴承座和挡肩。
