Examkin

Soru

Zorluk: OrtaMultimeter: Voltage and Current Measurement

When measuring the operating potential difference across an active 120 V120\text{ V} AC ventilation fan motor, which multimeter dial setting and lead connection configuration should be used?

  1. A
    Connect the meter in series with the motor, insert the red lead into the 10A jack, and set the dial to AC current (A∼A\sim).
  2. Connect the meter in parallel across the motor terminals, insert the red lead into the V/Ω\text{V}/\Omega jack, and set the dial to AC voltage (V∼\text{V}\sim).Cevap
  3. C
    Connect the meter in parallel across the motor terminals, insert the red lead into the V/Ω\text{V}/\Omega jack, and set the dial to DC voltage (V−−‾\text{V}\overline{--}).
  4. D
    Connect the meter in series with the motor, insert the red lead into the V/Ω\text{V}/\Omega jack, and set the dial to AC voltage (V∼\text{V}\sim).

Cevap

Connect the meter in parallel across the motor terminals, insert the red lead into the V/Ω\text{V}/\Omega jack, and set the dial to AC voltage (V∼\text{V}\sim).
Measuring potential difference requires configuring the digital multimeter as a voltmeter by placing the red probe into the V/Ω\text{V}/\Omega terminal and the black probe into COM\text{COM}, selecting AC voltage (V∼\text{V}\sim), and connecting the probes in parallel across the energized component. A voltmeter has very high internal impedance so that it draws negligible current and does not disturb circuit operation.

Adım Adım Çözüm

1
Determine the measurement type and power source characteristics
The target measurement is electrical potential difference (voltage) on a 120 V120\text{ V} alternating current (AC) power source.
Multimeter function selection requires knowing whether the signal is AC or DC and whether voltage, current, or resistance is being evaluated.
2
Select the proper multimeter input jacks and dial position
Black lead in COM\text{COM}, red lead in V/Ω\text{V}/\Omega, and selector dial switched to AC Volts (V∼\text{V}\sim).
The V/Ω\text{V}/\Omega port routes the signal through high-impedance circuitry, and the AC voltage mode properly samples and computes the root-mean-square (RMS) voltage.
3
Identify the proper circuit connection topology
Connect test leads across (in parallel with) the fan motor terminals while the circuit is live.
Voltmeters possess extremely high internal resistance (typically >10 MΩ>10\text{ M}\Omega) and must be placed across a component to measure potential difference without altering circuit current.

Anahtar Kavram

Multimeter configuration for AC voltage measurement requires parallel connection across the load and high-impedance voltage jack selection.
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Multimeter: Voltage and Current Measurement

Bu konudan daha fazla soru