Always verify the incoming supply before moving deeper into testing. Inside the inverter, incoming AC is rectified into DC and stored in the DC bus (usually across large capacitors). With power applied, switch the multimeter to DC voltage mode. Measure across the positive and negative DC bus terminals.
Set the multimeter to AC voltage mode. Measure the voltage at the inverter's input terminals. Confirm that the reading matches the inverter's rated input voltage range (e.g., 220V, 380V, or 480V AC depending on the model). If the voltage is unstable or outside specification, the inverter may not operate correctly.
The full scale that can be measure is 1026 V. The measurement is done by applying a DC-Link voltage between 50 V to 1000 V. During this test, the inverter is running and the motor is disconnected, which brings a switching frequency of 16 kHz. The uncalibrated error is observed to be ±1% throughout the measurement range. Figure 16.
A) This reference design reduces system cost and enables a compact design for isolated phase current and DC-Link voltage measurement in three-phase inverters, while achieving high bandwidth and sensing accuracy. The output of the isolated amplifiers is interfaced to the internal ADC of the MCU using a differential-to-single-ended circuit.
Using a multimeter, you can accurately measure DC input voltage, AC output voltage and frequency, and assess the inverter''s response under varying loads. Understanding the implications of
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This reference design reduces system cost and enables a compact design for isolated phase current and DC-Link voltage measurement in three-phase inverters, while achieving high
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