How is Hi-pot peak and RMS measured?
As well as providing an accurate RMS measurement, the AT3600 is simultaneously monitoring the peak instantaneous current.
This peak detection will shut down the generator and report a fail in the event of a breakdown (flash-over) during the test.
During an AC Hi-pot test the current is sampled every 3.2 micro-seconds and an RMS value calculated.
A minimum of 2 RMS values are averaged to create an average RMS value.
This average value is the value that is compared to the limit set by the user.
So, allowing for software overheads, on a 50Hz test, the test would stop after approximately 50mS.
There is also a hardware detection circuit that will pick up the current generated by a spark / breakdown.
This will generate an interrupt to the controlling processor that will shut down the test immediately and report an error.