Found that all 8 wires (4 twisted pairs) had a signal.
And just probing with an ungrounded probe showed that these were 120v peak-to-peak:
Confirmed by switched to a 10x probe:
So my conclusion is that:
1) They are using a differential carrier on all 4 twisted pairs
2) I need to use a comparator to get a digital signal
3) My readings will be distorted by 50Hz 230v mains hum.
4) The timebase was 2 mSec/Div so period was 12 mSec / 80Hz
Interestingly the meter is packed with electronics:
And the 20A charge controller uses the base as a metal heatsink:
I'm hoping I may be able to upgrade a 10A controller to a 20A one myself but it doesn't look that straightforward.
And just probing with an ungrounded probe showed that these were 120v peak-to-peak:
Confirmed by switched to a 10x probe:
So my conclusion is that:
1) They are using a differential carrier on all 4 twisted pairs
2) I need to use a comparator to get a digital signal
3) My readings will be distorted by 50Hz 230v mains hum.
4) The timebase was 2 mSec/Div so period was 12 mSec / 80Hz
Interestingly the meter is packed with electronics:
And the 20A charge controller uses the base as a metal heatsink:
I'm hoping I may be able to upgrade a 10A controller to a 20A one myself but it doesn't look that straightforward.
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