The new documentation was a grind, and took a lot longer than I had anticipated (what doesn’t?). But it’s on the air now and Although I have some pressing topics to add, I would call the conversion done.
So moving on, there are two things in development:
The rollout of version 4.9 of the hardware, along with the new enclosure, is still taking up some time, and will continue to do so until about mid-March.
The next big project, which is planned out and somewhat started, is to build a new phase calibrator that can do 50Hz and 60Hz and hopefully test to 200A. Once that’s done, the job will be to retest all of the sample CTs in the collection and update the tables with both 50Hz and 60Hz shift corrections.
The last part of the job will be to change IoTaWatt to use the appropriate shift corrections for the measured line frequency.
One major hurdle that I’ve already passed is development of a new phase measurement algorithm for IoTaWatt. This new code produces very repeatable results to about 0.02°, so I’m optimistic that this will improve phase correction in the 50Hz world where the 60Hz calibrations are being used.
As I’ve said before, in the general case the net shift is usually reasonably close anyway, but there are some cases, particularly with the newer low shift VTs, where frequency specific calibrations can improve the results.