3-Phase Datalogging

Jamie Adam

• April 10, 2021 23:42

I appreciate that the size of the Pokit Meter means that it can't be used safely for mains voltage measurement, as it would be too hard to meet regulatory insulation requirements - though its size would make it ideal for leaving plugged into a client's installation.  The new Pokit Pro looks set to address this issue.

Would it be possible to link Pokit Pros together to measure across all phases (and ideally Neutral) of a 3-phase supply simultaneously?  Many large domestic properties, and most commercial ones have 3-phase supplies, so this would significantly widen the usability of the Pokit Pros.

The ability to use clamp probes would make this much safer for Pokit Pros left unattended for datalogging purposes.

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• Official comment

  

  Lachlan M

  • April 11, 2021 23:00

  Hi Jamie Adam, with Pokit Pro, you will be able to see up to 4 channels/phases (with the use of 4 Pokit Pro units).

  In this case, the Pokit App can give raw data of all three phases, but initially won't have math functions to add them all together and calculate in-app. We will be adding math functions in-app at a later point.

  In terms of the clamp probes, watch this space...
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  Jamie Adam

  • April 12, 2021 08:59

  Great!  Thanks for the swift response.  

  I suppose it'll depend on how accurate the clocks are on each Pokit Pro, as otherwise it will be hard to synchronise the data to see exactly what's happening at a particular point in time.

  Given that all the Pokit Pros will have Bluetooth, would there be any chance of allowing the software at a later stage to designate one Pokit Pro as a Master and the remainder as Slave units for synchronisation purposes, so that we can get a true picture of performance on each phase simultaneously?

  It wouldn't be a problem while on site if the software designates the timing, but for datalogging purposes you'd need independent synchronisation.  It might be sensible to cycle this over long time intervals - say every hour - to reduce battery consumption transmitting on Bluetooth the whole time.

  I can only see this datalogging requirement increasing until power supply manufacturers can build power supplies with greater tolerance for higher Grid voltages.

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  Lachlan M

  • April 15, 2021 23:22

  Hi Jamie Adam, the master - slave synchronisation that you were mentioning is exactly what Pokit Pro will do when you connect multiple devices! 

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