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Zorluk: OrtaMultimeter: Resistance and Continuity

An avionics technician is inspecting a de-energized multi-conductor wiring harness to verify that no internal short circuits exist between adjacent wires. With both ends of the harness completely disconnected from all components and power sources, the technician sets a digital multimeter to the resistance (Ω\Omega) function and connects the test leads across two separate, insulated conductors. If the insulation between these two conductors is completely intact, what should the multimeter display?

  1. A
    A reading of approximately 0 Ω0\ \Omega, confirming continuity between the two conductors.
  2. An over-limit or infinite resistance reading (OLOL), indicating an open circuit between the conductors.Cevap
  3. C
    A fluctuating DC voltage reading generated by the meter's internal measurement circuit.
  4. D
    A nominal resistance of approximately 10 Ω10\ \Omega, reflecting standard conductor insulation resistance.

Cevap

An over-limit or infinite resistance reading (OLOL), indicating an open circuit between the conductors.
When testing between two separate, properly insulated wires in a de-energized harness, there should be no conductive path between them. A digital multimeter set to resistance mode will measure this absence of continuity as infinite resistance, displayed on the digital screen as 'OL' (open loop/over-limit).

Adım Adım Çözüm

1
Analyze the circuit state and component relationship under test.
Two distinct conductors in a disconnected wiring harness are separated by insulation and should have no electrical connection between them.
Intact insulation ensures complete electrical isolation between separate conductors.
2
Determine the expected electrical resistance between two isolated conductors.
Because no conductive path exists, the resistance between the conductors is theoretically infinite (an open circuit).
An open circuit allows zero current flow between isolated paths.
3
Identify how a digital multimeter indicates infinite resistance in resistance measurement mode.
Digital multimeters display 'OL' (over-limit/open loop) or infinity to indicate an open circuit exceeding the meter's range.
The meter detects no closed loop or measurable current between its test leads.

Anahtar Kavram

Multimeter interpretation of open circuits vs. shorts during insulation and continuity testing
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Konular

Multimeter: Resistance and Continuity

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