The　power　source　of　the　distribution　automation　terminal　detection　platform　is　one　of　the　important　devices　for　simulating　the　fault　signal　of　the　distribution　network　and　testing　the　performance　of　the　distribution　safety　equipment.　The　power　source　is　programmable,　and　a　fault　signal　is　written　to　it,　and　the　power　source　can　be　used　to　simulate　the　corresponding　fault　signal,　which　is　of　short　duration,　usually　a　transient　signal.　In　this　paper,　a　measurement　system　based　on　the　transient　signal　of　the　analog　output　of　the　power　source　is　constructed,　and　the　quality　of　the　measured　signal　waveform　is　evaluated.　In　this　paper,　the　transient　signal　is　divided　into　transient　voltage　signal　and　transient　current　signal,　and　the　voltage　and　current　are　repeatedly　measured　by　two　measurement　systems.　The　maximum　offset　of　the　signal　amplitude　and　the　maximum　offset　of　the　phase　are　used　to　evaluate　the　difference　between　the　measured　transient　signal　and　the　transient　signal　waveform　written　to　the　power　source,　and　to　evaluate　whether　the　performance　of　the　power　source　is　intact.　The　amplitude　and　phase　maximum　offset　obtained　by　the　experimental　data　are　small,　showing　a　high　uniformity,　and　it　can　be　concluded　that　the　power　source　used　in　this　paper　has　good　performance　and　can　accurately　simulate　the　output　fault　signal.　©　The　Institution　of　Engineering　&　Technology　2024.