Practice correct digital multimeter mode, range, lead placement, and connection topology while measuring DC voltage, AC voltage, DC current, resistance, and continuity on a deterministic calibration fixture.
Complete the procedure, collect the required measurements, pass the engineering validation, and answer every graded concept question correctly.
Only a passed engineering check satisfies guided completion. Warnings and failures remain visible even if the procedure checklist is complete.
Choose one answer for each question. Each selection is graded immediately and saved locally. Guided Lab completion requires every concept question to be correct.
Concept score: 0 / 5 correct
Use COM + VΩ. Measure voltage in parallel with the source or component.
The meter is connected across an ideal DC calibration source.
The ideal Phase 1.4 DMM reports the sine-source RMS level. Frequency-response limitations arrive with the Phase 1.7 non-ideality model.
The ammeter is inserted in series. The independent expected current is calculated from I = V/R.
This fixture is unpowered. A real DMM uses its internal test source to infer resistance.
Continuity detected: path resistance is at or below the threshold.
DC voltage fixture ready.
The DMM result is only credible when the selected function, lead jack, connection topology, and range agree with the quantity being measured. These readouts provide a non-visual check of the current front-panel state.
For current mode, independently verify I = V/R. For voltage and resistance fixtures, compare the DMM display with the known calibration value. An overload indication is a setup result, not a numeric measurement.
A voltmeter measures electric potential difference between two nodes, so its leads are placed across the source or component. In the ideal Phase 1.4 model the meter does not load the circuit.
V = Δelectric potentialAn ammeter must be inserted into the current path. The calibration fixture uses a known source and load so the expected current can be checked independently with Ohm’s law.
I = V / RResistance and continuity modes apply an internal test stimulus in a real DMM. They therefore belong on an unpowered circuit. Continuity is a threshold decision based on the measured path resistance rather than a different electrical quantity.
Autorange chooses the smallest available full-scale range that contains the magnitude of the reading. A manual range that is too small produces an overload indication instead of a believable number. The shared Phase 1.7 model now provides optional calibration offset, noise, and quantization. Input impedance, burden voltage, fuse behavior, and AC frequency-response limits remain hardware-specific future effects.
Compares the ideal meter reading with the independently defined or analytically calculated fixture value.
Run the experiment to perform this check.
Run the experiment to generate an engineering interpretation.
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