6 ms·

An oscilloscope.

by stagbeetle 10y ago

An oscilloscope.

ars 10y ago
An oscilloscope is the display. I was asking what measures the current.
- kevin_thibedeau 10y ago
  A current shunt. There are modern energy monitoring ICs that sample voltage and current at high speed and accurately compute power and energy with switched reactive loads.
- zkms 10y ago
  per the article, a Dranetz Products made PowerXplorer PX5-400 http://www.dranetz.com/product-services/current-dranetz-products/powerxplorer-px5-400/ http://www.dranetz.com/product-services/current-dranetz-prod... here's the original paper http://ieeexplore.ieee.org.sci-hub.bz/document/7866234/?reload=true http://ieeexplore.ieee.org.sci-hub.bz/document/7866234/?relo...
  - barrkel 10y ago
    The headline deviations are measured with respect to an eletromechanical meter (the kind that predated smart meters, described as a Ferraris principle meter).
- mcshicks 10y ago
  A current probe. You might need more then one probe for instance you might have one current probe that was accurate at a lower current but could not measure the higher current, and a second probe for the high current. Then process the data using the appropriate instrument depending upon the current. I haven't done much w/ AC power measurements, but it's a common enough problem (large dynamic current range) for DC power measurements. Agilent (now Keysight) make instruments like the N6705B DC Power Analyzer that can sample a pretty high rates (like 10's of uSeconds) and be accurate at both uA range and 100's of mAs for dynamic current. I would imagine you could rig up something similar for AC power measurements.
- barrkel 10y ago
  You may be interested in this earlier 2016 paper by the same authors: http://doc.utwente.nl/102016/1/Runaway_energy_Meters.pdf http://doc.utwente.nl/102016/1/Runaway_energy_Meters.pdf In this paper, it seems they were using an electromechanical meter (i.e. the analog style that predated digital) for reference because that's what consumers were using. This is measuring energy, obviously, not current.

An oscilloscope.

ars 10y ago

An oscilloscope is the display. I was asking what measures the current.

kevin_thibedeau 10y ago
A current shunt. There are modern energy monitoring ICs that sample voltage and current at high speed and accurately compute power and energy with switched reactive loads.
zkms 10y ago
per the article, a Dranetz Products made PowerXplorer PX5-400 http://www.dranetz.com/product-services/current-dranetz-products/powerxplorer-px5-400/ http://www.dranetz.com/product-services/current-dranetz-prod... here's the original paper http://ieeexplore.ieee.org.sci-hub.bz/document/7866234/?reload=true http://ieeexplore.ieee.org.sci-hub.bz/document/7866234/?relo...
- barrkel 10y ago
  The headline deviations are measured with respect to an eletromechanical meter (the kind that predated smart meters, described as a Ferraris principle meter).
mcshicks 10y ago
A current probe. You might need more then one probe for instance you might have one current probe that was accurate at a lower current but could not measure the higher current, and a second probe for the high current. Then process the data using the appropriate instrument depending upon the current. I haven't done much w/ AC power measurements, but it's a common enough problem (large dynamic current range) for DC power measurements. Agilent (now Keysight) make instruments like the N6705B DC Power Analyzer that can sample a pretty high rates (like 10's of uSeconds) and be accurate at both uA range and 100's of mAs for dynamic current. I would imagine you could rig up something similar for AC power measurements.
barrkel 10y ago
You may be interested in this earlier 2016 paper by the same authors: http://doc.utwente.nl/102016/1/Runaway_energy_Meters.pdf http://doc.utwente.nl/102016/1/Runaway_energy_Meters.pdf In this paper, it seems they were using an electromechanical meter (i.e. the analog style that predated digital) for reference because that's what consumers were using. This is measuring energy, obviously, not current.