Displaying Pulsating 1Hz 10A Current on DPM Using 0.1Ω Shunt and Precision Amplifier

A current source delivering up to 10 A with a 1 Hz pulsed operation (1 second ON, 1 second OFF) is used for magnetic field generation. The user attempts to measure and display this pulsating current on a digital panel meter (DPM) using a 0.1 Ω shunt resistor, which produces a low voltage signal (0.1 V per 1 A). To amplify this signal, a precision amplifier is employed instead of an RC smoothing circuit, but the DPM reading fluctuates instead of showing a stable value. Responses suggest that the DPM's sampling rate and timing may cause inconsistent readings due to sampling at varying points of the pulse waveform. Recommendations include providing a circuit schematic and oscilloscope waveform for analysis, implementing sample-and-hold circuitry or a peak detector to convert the pulsed current signal into a stable DC level for the DPM, and clarifying the pulse frequency (noting that 1 second ON and 1 second OFF corresponds to 0.5 Hz output frequency). The discussion emphasizes the need for signal conditioning to achieve a constant display on the DPM.
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