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A monitor that checks that the encoder is working properly. The wearable Portable People Meter carried by each panelist. A base station for each PPM, where each panelist in the household places it overnight to recharge the battery. A portable charger for vacations and other trips away from the home base.
An electronic circuit containing a feedback loop controls the gas-pump current to keep the output of the electrochemical cell constant, so that the pump current directly indicates the oxygen content of the exhaust gas. This sensor eliminates the lean–rich cycling inherent in narrow-band sensors, allowing the control unit to adjust the fuel ...