基于数字自激算法设计并实现的超导腔垂直测试系统提高了超导腔的垂直测试效率，为先进光源技术研发与测试平台（PAPS）的超导腔批量化生产提供了重要保障；垂直测试系统的射频前端和时钟分配系统采用了二次上下变频方案，可以在一定范围内灵活设置测试系统自激环路的工作频率，增大了该测试系统的工作带宽。利用此系统完成了1.3 GHz 9-cell超导腔的通带频率测试，结果表明，该测试系统能有效避免不同模式之间的串扰，具备较强的频率分辨能力（＜800 kHz），保证多单元超导腔性能验证的进行。

Vertical test is an important method for characterizing the performance of superconducting cavities. We designed an superconducting cavity vertical test system based on digital self-excited algorithm and the technology of low-level radio frequency, which could improve the vertical test efficiency of superconducting cavities. The RF front-end and clock distribution system of the vertical test system adopts the second up-and-down conversion scheme. To some extent, the working frequency of the digital self-excited loop of the vertical test system can be set flexibly, and the working bandwidth of the test system is increased. The test results of the pass-band frequency of the 1.3 GHz 9-cell superconducting cavity show that the vertical test system has strong frequency resolution (＜800 kHz) to ensure the smooth progress of the multi-cell superconducting cavity pass-band test.