Which of the illustrated electrical meters is specifically designed to measure relatively heavy AC currents by clamping action, but can also measures AC volts and resistance and features an analog display? See illustration EL-0121.
• Focus on which instrument uses a clamp around a conductor to sense current without breaking the circuit. • Remember that a clamp-on ammeter for "relatively heavy AC currents" will typically have a large jaw opening and be clearly marked for AC amps. • The question specifies an analog display, so look for a moving-needle scale rather than a digital screen.
• Among the meters shown, which ones clearly have clamp jaws, and which of those show a needle scale instead of digits? • Which clamp-type instrument also has a selector dial with ranges for AC volts and resistance (ohms), not just current? • Does any non-clamp meter fit all parts of the description (heavy AC current, clamp action, AC volts, resistance, analog)? If not, eliminate them.
• Verify that your choice has a clamp jaw built into the body of the meter, not just test leads. • Confirm that the display is analog (needle and scale) rather than digital numbers. • Check the function/range markings for AC amps, AC volts, and ohms all on the same selector dial.
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