Jester
Full Member level 6

I have been tasked with designing a circuit to measure the phase angle between the legs of a 3-phase 208V system.
Can anyone offer real world suggestions on using a transformer vs. an isolation amplifier?
- I will need to determine the phase angle with ± 2 degree resolution / accuracy, aiming for ± 1 degree
- The processor has an integral 12bit A/D with 0-3Vdc signal range, and can can easily sample and measure the discrete points every 20us
- Isolation will be required between the hazardous 208V system and the A/D
- This device must be designed to pass UL safety requirements, so the isolation device must be certified/recognized by UL
Can anyone offer real world suggestions on using a transformer vs. an isolation amplifier?
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