■ DC bias current: 30A, max
■ AC Ripple current: ±6A, max
■ Test frequency (Sinusoidal): 10kHz to 3MHz
■ Test frequency (Pulse): 10kHz to 1MHz (Duty10%-90%)
In real-world applications, AC and DC magnetic fields are often present simultaneously. For that reason, magnetic property testing under varying DC bias conditions is highly important.
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SY-961 | DC Bias Source for SY-821x and SY-8264, 0.00A to 30.0 A DC, 0.01 A resolution | ||
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SY-960 | DC Bias Tester for SY-821x and SY-8264; with SY-8218: 10 kHz to 3 MHz, with SY-8219: 10 kHz to 1 MHz (requires SY-961) | ||
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SY-962 | DC Bias AC Blocker for SY-821x and SY-8264, 30A, 36V peak | ||
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SY-509 | GBIP-USB converter for the IWATSU B-H Analyzer. Included in IWATSU Remote control PC software for SY-8218 and SY-8219 | |
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SY-810 | Remote control PC software for SY-8218 and SY-8219 including GP-IB converter SY-509, Bulkhead adaptor 182766-01 | |
This example highlights the value of the IWATSU B-H Analyzer’s DC Bias option when evaluating magnetic components under realistic operating conditions. A chip inductor is tested under chopper excitation, with the measured current and voltage waveforms shown on the left.
In the left image below, the ΔB-ΔH curves illustrate how the magnetic behavior changes as the DC bias current (Idc) is increased while maintaining constant ΔH. On the right image below, the relationship between DC bias and core loss variation (ΔPc) shows how bias conditions directly affect loss performance.
This kind of analysis is essential for understanding how inductors behave in practical power electronics applications, where AC excitation and DC bias are often present at the same time. With the DC Bias option, the IWATSU B-H Analyzer helps reveal performance changes that would remain hidden in zero-bias testing alone.
Current and voltage signals, and ΔB-ΔH curves
Relationship between DC bias and core loss variation (ΔPc)
This example shows how the IWATSU B-H Analyzer with DC Bias option can be used to evaluate a ferrite SMD inductor (L = 1.0 µH) under realistic operating conditions. The measurements demonstrate how both the B-H characteristic and the core loss change as DC bias current and excitation level are varied.
The B-H curves illustrate the magnetic response of the component at 100 kHz sine excitation with Idc = 2.5 A, measured at different ripple current levels. As the excitation increases, the loop expands, clearly showing the change in magnetic behavior under biased operation.
The ΔPc vs. Idc plot shows how core loss develops as the DC current increases, again for different ripple current conditions. This makes it possible to see not only the magnetic operating point, but also how loss performance shifts under combined AC and DC excitation.
Such measurements are highly valuable for the design and evaluation of power inductors, chokes, and magnetic materials, where DC bias and AC excitation are present simultaneously in real applications.
B-H curves of a ferrite SMD inductor at 100 kHz sine excitation under DC bias
Core loss variation versus DC bias current at different ripple current levels
A Fe-based amorphous core (311 µH) is measured with the IWATSU B-H Analyzer DC Bias option to evaluate how DC magnetic field influences magnetic behavior and core loss. The plot shows that loss increases with bias, highlighting the importance of testing magnetic materials under realistic biased operating conditions.
Fe-based amorphous core measurement with the IWATSU B-H Analyzer DC Bias option
Core loss versus DC magnetic field under constant ΔB excitation
An iron powder core (8.4 µH) is measured under DC bias to show how its effective permeability changes with increasing DC magnetic field. This type of analysis is useful for understanding how magnetic components behave in practical power electronics applications, where bias conditions strongly influence performance.
Iron powder core measurement with the IWATSU B-H Analyzer DC Bias option
Permeability versus DC magnetic field under constant ΔB excitation
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