SSTF

Single Strip Test Fixture

The Single Strip Test Fixture is used to characterize the magnetic properties of materials in accordance with ASTM standard test methods for alternating magnetic properties of materials at power frequencies using sheet-type test specifications. When used in conjunction with an AMH Hysteresisgraph, the fixture can measure specific core loss, peak permeability, saturation induction, coercivity (H_c) and residual induction (B_r) of sheet specimens.

The Single Strip Test Fixture consists of a specially laminated yoke and excitation/measurement coil. The coil contains both primary and secondary windings. The primary winding carries the voltage and current to excite the strip specimen.

The H field experienced by the specimen is directly proportional to the primary current. The secondary winding senses the voltage induced by the changing magnetization of the specimen. The B field is proportional to the integral of the secondary voltage. An adjustable air flux compensator is included as part of the fixture to eliminate secondary winding signals which are due solely to the mutual inductance of the primary and secondary windings.

The Single Strip test is a relative test and should be correlated with Epstein frame data if absolute measurements are required. If the Epstein frame is also to be used, the strips should be cut to the required size for the Epstein frame (3-cm wide by 30-cm long).

Conforms to ASTM-A804.
Measures Specific core loss, peak permeability, saturation induction, coercivity (Hc) and residual induction (Br).
Frequency Designed to test from DC to 400 Hz.
Max Field 100 Oersteds
Sample size 5.9” (15 cm) minimum length (longer lengths are allowed to extend outside the fixture), 0.75” to 1.5” (2-4 cm) width and 0.025” (0.64 mm) maximum sample thickness.

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