If a digital multimeter is set up as shown in figure "B" of the illustration, what would be displayed on the screen if the single pole, single throw switch being tested is in the "off" position, but the internal switch contacts are welded together? See illustration EL-0210.
• How a digital multimeter behaves in the ohms (Ω) / continuity position • What OL (open loop/open line) indicates versus a very low resistance reading • What it means electrically when switch contacts are mechanically OFF but welded closed
• In figure B, is the meter set to read voltage or resistance/continuity? How should the display behave for a good switch that is truly OFF? • If a switch is supposed to be open but its contacts are welded together, is the circuit open or closed from the meter’s point of view? What kind of resistance does a closed contact normally show? • Looking at the answer choices, which ones represent an open circuit indication and which represent a closed/short circuit indication?
• Confirm from the illustration which meter function is selected (Ω vs volts). • Decide whether welded contacts create an open circuit (infinite resistance) or a short/near‑zero resistance path. • Match that condition to the choice that represents near‑zero ohms rather than OL or a specific resistor value like 470 ohms.
No comments yet
Be the first to share your thoughts!