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A "Sinking" input card acts as a passive load to ground; it does not provide excitation voltage. Therefore, it requires a "4-Wire Active" transmitter (or a setup with an external power supply) that can "source" (push) the current into the card.

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If a fuse blows (opens), the circuit is broken, and current stops flowing. However, the potential difference (Voltage) from the power supply is still present at the break point. If you measure across the open fuse, you will read the full supply voltage (e.g., 24V), as the meter bridges the gap.

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A "Sinking" PLC Input card typically requires which type of connected device?

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"As-Found" data is the set of readings taken from the instrument before any adjustments or calibrations are made. This documents the drift or error state of the device since its last calibration. "As-Left" data is recorded after adjustments are completed.

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What is the voltage measured across an open fuse in a powered 4-20 mA standard loop?

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A loop-powered indicator consumes no current (it passes the 4-20 mA through) but it "steals" voltage from the loop to power its display. This creates a voltage drop (typically 1V to 2.5V) that must be accounted for when calculating if the power supply can drive the total loop load.

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In calibration terms, "As-Found" data refers to:

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