| 简介 |
PROBLEM TO BE SOLVED : To solve the problem that, when utilizing a +5 V power source on the personal computer side by connecting a route measuring apparatus using an analog circuit to the personal computer through a USB interface or the like, a measured value of a measuring circuit becomes unstable and inaccurate by a power source noise which is specific to switching/regulator.SOLUTION : While a USB interface or a +5 V power source acquisition circuit uses a known earth separation circuit, supply in the apparatus of a +5 V power source on the personal computer side is suspended only for a moment when a measuring circuit measures an application current by applying a pulse voltage, and operation is continued during the suspension time only by accumulated power in a smoothing capacitor, to thereby remove noise contamination.COPYRIGHT : (C)2015, JPO&INPIT |
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