
100 Handbook of Magnetic Measurements
and, at the same time, possibility to test a large
area by averaging the results obtained from
many samples.
• Although the assembling of the Epstein frame
is rather fast, it is still off-line test—by using
as a sample, the sheet of material (SST), we can
design the measuring system for online test-
ing (Iranmanesh et al. 1992, Khanlou et al. 1995,
Zemanek 2009).
• Correct designed strip or sheet tester can
determine the material parameters with high
accuracy.
As discussed earlier, when we have an open sample as
sheet or strip, we close the magnetic circuit with a yoke
(Figure 2.