US 11,940,475 B2
Methods and apparatus to determine an operational status of a device
Bostjan Valencic, Koper (SI); and Igor Sotosek, Portoroz (SI)
Assigned to The Nielsen Company (US), LLC, New York, NY (US)
Filed by The Nielsen Company (US), LLC, New York, NY (US)
Filed on May 12, 2022, as Appl. No. 17/743,207.
Application 17/743,207 is a continuation of application No. 16/933,938, filed on Jul. 20, 2020, granted, now 11,360,131.
Application 16/933,938 is a continuation of application No. 15/721,432, filed on Sep. 29, 2017, granted, now 10,718,799, issued on Jul. 21, 2020.
Application 15/721,432 is a continuation of application No. 14/148,278, filed on Jan. 6, 2014, granted, now 9,784,774, issued on Oct. 10, 2017.
Prior Publication US 2022/0268820 A1, Aug. 25, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 21/00 (2006.01); G01R 19/00 (2006.01); G01R 21/133 (2006.01); G01R 33/02 (2006.01)
CPC G01R 21/00 (2013.01) [G01R 19/0092 (2013.01); G01R 21/133 (2013.01); G01R 33/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
memory; and
processor circuitry to execute computer readable instructions to at least:
measure with a first sensor, a first magnetic field in at least three dimensions, the first magnetic field including a device magnetic field caused by a wire attached to a device to supply electricity to the device, the first sensor proximately arranged to the wire;
measure with a second sensor, a second magnetic field associated with an environment at least a first distance from the wire, the first distance from the wire to ensure the second magnetic field measured by the second sensor essentially does not include the device magnetic field;
compare (a) the first magnetic field as measured by the first sensor arranged proximate to the wire and (b) the second magnetic field as measured by the second sensor arranged the first distance from the wire to determine an operational status of the device; and
collect audience measurement data based at least in part on the operational status of the device.