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What is the difference between a BH analyzer and an impedance analyzer?
Q.What is the difference between a B-H analyzer and an impedance analyzer?
A.An impedance analyzer is a small-signal (tens of mA) electronic component parameter measurement device that can measure parameters such as Q, R, and Z of magnetic components. In contrast, the measurement range of a B-H analyzer extends from small signals to large signals (5 mA to 6 A), and it can measure magnetic characteristic values of soft magnetic materials such as the B-H curve, core loss, and permeability of magnetic components. A B-H analyzer is suitable for measurement under the actual driving conditions of magnetic components.
Q.Some oscilloscopes can also measure magnetic characteristic values such as core loss. What is the difference from a B-H analyzer?
A.The function of calculating magnetic characteristic values such as magnetic field (strength) and magnetic flux density from the measured excitation current and induced voltage is the same, but there are the following two major differences between measurement using an oscilloscope and measurement using a B-H analyzer.
Measurement resolution of excitation current and induced voltage
Phase difference correction method for excitation current and induced voltage
The first point is the measurement resolution in ①. The measurement resolution of an oscilloscope is generally 8 bit. In contrast, the B-H analyzers SY-8218 / SY-8219 are 16 bit. Because a B-H analyzer can capture waveforms with high resolution, it can obtain magnetic characteristic values with high measurement accuracy.
The second point is the phase difference correction in ②. The phase difference between the excitation current and the induced voltage is an important parameter that greatly affects core loss. In oscilloscope measurement, the time difference between measurement channels is eliminated by phase offset adjustment (deskew), and the phase difference is corrected in this way. However, since the frequency-phase characteristics of actual current probes are not linear (the group delay characteristics are not flat), accurate phase correction cannot be achieved by deskew alone. Although some power analyzers have a deskew function, they likewise cannot achieve accurate phase correction.
In contrast, a B-H analyzer can predict the frequency-phase characteristics between measurement channels and then accurately correct the phase difference for each frequency and each measurement range. Therefore, a B-H analyzer can measure core loss with extremely high measurement accuracy. A B-H analyzer can measure the extremely small core loss of powder compacted materials, which is difficult to measure with an oscilloscope or power analyzer.
