![DC bias tester](/wp-content/uploads/2024/06/sy8218_dc_bias-img01e.jpg)
- Maximum DC bias
- : 30A
- Maximum ripple
- : ±6A
- Measurement frequency (sine wave)
- : 10kHz~3MHz
- Measurement frequency (square wave)
- : 10kHz~1MHz (Duty10%~90%)
![SMD power inductor](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img02.jpg)
SMD power inductor
![Toroidal coil](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img03.jpg)
Toroidal coil
![DC bias non-sinusoidal](/wp-content/uploads/2024/06/img-DC-biasing-with-AC.png)
Square wave (triangular current flowing through the sample = pseudo chopper), superimpose DC on the sine wave to measure magnetic characteristics
Measurement example of chip inductor (chopper excitation)
![Measurement example of chip inductor (chopper excitation)](/wp-content/uploads/2024/06/img-chopper-excitation.png)
In real circuits, DC and AC magnetic fields are often applied to magnetic parts, and it is important to measure the magnetic properties that change due to DC bias.
![Measurement part](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img06.jpg)
ferrite
L=1.0µH
![Graph](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img07.jpg)
![Graph](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img08.jpg)
![Measurement part](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img09.jpg)
Fe-Based amorphous
L=311µH
![](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img10.jpg)
![Graph](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img11.jpg)
![Measurement part](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img12.jpg)
iron powder
L=8.4µH
![Graph](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img13.jpg)
![Graph](/wp-content/uploads/2022/10/tme-sy-sy8218_dc_bias-img14.jpg)
* The DC bias tester is an option only for SY-8218 and SY-8219, so it cannot be used with other equipment.
* It needs to be adjusted with the B-H analyzer main unit at the time of shipment.
* If you already have the main unit (SY-8218/8219), you will need to take it back to our factory for adjustment.