When evaluating power electronics, several measurement scenarios are typical:
Small voltages at large common mode voltages Different voltage levels at different potentials at the same time Fast rise-/ fall-times – in particular for wide-bandgap (WBG) materials like GaN, SiC Floating Measurements on multiple signals channels Current measurements
In principle, differential high-voltage probes are ideal for these types of measurement. With up to 200 MHz bandwidth and an excellent common mode rejection ratio (CMRR) over a broad frequency range, the R&SRT-ZHD high voltage differential probes are ideal for measurements on fast-switching semiconductors. Very low added noise results in high-quality measurements. With 0.5% ensured gain accuracy in the signal path and a DC voltmeter (R&SProbeMeter) with 0.1% accuracy integrated into the probe head, the R&SRT-ZHD probes provide the best available precision in their class. Very low drift makes regular calibration during measurements unnecessary. To measure ripple voltages on the DC link, high offset voltages must be compensated for, to measure with high vertical sensitivity. Due to its integrated offset circuit, the R&SRT-ZHD probes offer an offset voltage range that is independent of the vertical setting of the oscilloscope and the attenuation factor on the probe. Measure the smallest of ripple voltages on large DC link voltages without compromising sensitivity Typical measurement parameters to evaluate power electronics are:
Power Consumption / Efficiency / Standby Power Power Quality / Power Factor Voltage and Current Waveform Analysis Ripple Inrush Current / Transients Startup / shutdown behavior Load regulation PWM (pulse width modulation) analysis EMC / Harmonics analysis