Turns Of A Sample - Iwatsu SY-8218 Instruction Manual

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4.4 Turns of a sample

● The following is the example of applying turns to a sample.
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No. of turns
No. of turns is the important factor deciding Max. magnetic field Hm and Max. magnetic flux density Bm. Basically, Iwatsu recommends that:
 No. of primary turns N
possible.
No. of turns should be determined considering above and referring to Section 4.3 while taking notice of below:
① Necessary Hm and Bm are obtained and V
is used, V m and I
1
② To avoid resonance caused by a sample and the input capacitance of this product when making measurement with a
measurement frequency f [Hz], the inductance L [H] of the sample to which turns is applied should satisfy expression (4.14).
L

L should be obtained by inductance measurement.
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How to apply turns
If No. of primary turns N
in Fig. 4-5 is recommended. It is made by making a twisted pair using primary and
secondary lines and winding the pair onto the core.
The magnetic flux for the bifilar winding leaks less than when primary and secondary lines
are wound individually: i.e. coupling coefficient between primary and secondary turns can be improved.
When make winding, take notice of below. Influence by leaked magnetic flux and eddy current can be
reduced.
 When applying winding, adhere line material to a sample as close as possible.
 Intervals between turns are as equal as possible.
 Twisted pair interval between primary and secondary lines is as close as possible.
 The thickness of material of a winding line is as thin as possible within the range permitted by a maximum current used.
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Termination processing of windings
Knots should be made at both ends of primary and secondary lines as marks as shown in Fig. 4-6
so that wrong connection to the measurement POD is reduced.
should be 3 turns or more, No. of secondary turns N
1
m does not exceed 200[V]. I
2
m do not exceed the maximum output of the power amplifier.
1
1

2
 
N

2

 
20 f 20
 
N
1
is equal to No. of secondary turns N
1
should be 1 turns or more, and N
2
m does not exceed 6[A]. In addition. if a power amplifier
1
(4.14)

12
10
, the bifilar winding shown
2
21
B-H ANALYZER SY-8218 / SY-8219
1
Fig.4-5 Bifilar winding
Knots are convenient as
a mark!
Fig.4-6 Termination processing of winding
is equal to N as much as
2