I am working on some applications which use TRIAC phase control or missing cycle method to control the output power to the load. I have tried to use data logger to acquire the voltage and current of the load, however according to this question about the fastest rate to acquire one channel, it can only read 67 or 112 reading per second (15ms or 9ms).
For TRIAC missing cycle control method, at 50Hz, I think I need to acquire the data at least twice faster than 10ms to have a reasonable accurate result. For phase control method, I think the require rate would be even much higher.
So, I would like to ask how can I measure the power/current for a TRIAC control loading?