How does the ST-3/XT3 works?
ST-3/XT3 : Transformer Rated Wireless Site Tester This unit is a socket type tester, that obtains the reading directly from the secondary of the current and potential transformers. It does not require any external load to perform tests and it is ...
Can I use it whitout accessories? How many accessories can I use with?
Yes, it can work without any accessories, depending on the test you wish to perform on the site. The only test that it is not available without accessories would be the primary/secondary analysis (Ratio Test). The accessories available are 3 ...
How about yearly calibration of the tester? Do the accessories need to be calibrated?
The units are calibrated at the factory before delivery to your facilities. We suggest verifying accuracy of the testers using the build in accuracy test in the application at least once a year or as per local PUC or company regulations to ensure ...
How does the admitance test work?
By injecting a small audio signal of 1525 Hz into the CT secondary, then measuring the induced current of the audio frequency to determine the admittance value. Analog filtering and programmable gain are used to get the best dynamic range for the DSP ...
How does it get the results? How about with a variable load?
The ST3/XT3 can display instantaneous RMS reading for voltage and current. The hardware within can get an averaged RMS over 12 cycles at 60 Hz and we could also run a moving average over a bigger set of RMS readings to reduce the effect of load ...