Furuno FCV-1200L, Руководство по обслуживанию

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Table 7.1 Ro: matching impedance Table 7.2 Ro: matching impedance
Freq. Power Type
Z(
Ω
) Ro(
Ω
)
Freq. Power Type
Z(
Ω
) Ro(
Ω
)
1 kw 15F-4S 16 + j31 78 1 kw 68F-8H 100 + j 100
2 kw 15F-10 23 + j69 233
68 kHz
3 kw 68F-30H 100 + j0 100
15 kHz
3 kw 15F-10X2 7.2 + j34.5 173 1 kw 88B-8 318 - j342 709
1 kw 28F-8 18 + j68 274 2 kw 88B-10 229 - j140 321
2 kw 28F-18 35 + j64 152
88 kHz
3 kw 88F-126H 100 + j0 100
28 kHz
3 kw 28F-24H 100 + j0 100 100 kHz 3 kw 100B-10R 198 + j248 509
1 kw 45F-3H 100 + j0 100 150 kHz 3 kw 150B-12H 100 + j0 100
2 kw 45F-6H 100 + j0 100 1 kw 200B-5S 246 - j282 575
45 kHz
3 kw 45F-12H 100 + j0 100 200B-8 98 - j87 177
50B-6/6B 190 - j165 333 200B-8B 95 - j82 169
50B-8G 100 + j0 100
2 kw
200B-8N 115 - j2 116
1 kw
50F-9B 95 - j90 180
200 kHz
3 kw 200B-12H 100 + j0 100
2 kw 50B-12 119 - j152 320 400 kHz 1 kw 400B-52 49 - j53 106
50 kHz
3 kw 50F-24H 100 + j0 100
7.3 Checking resonant frequency characteristic
Procedure 1 : using the impedance check circuit shown in figure 7.1.
Make an impedance check circuit as shown in figure 7.1 and measure the resistance at various
frequencies. Plot the measured resistance vs. frequency.
The typical curve is shown in figure 7.2.
Figure 7.2 Resonant characteristic curve : Frequency vs. Impedance
To check the transducer whether it is good or not, compare the curve with one obtained from a good
transducer.
If the transducer is defective, impedance curve differs form that of the normal transducer.
•
When transducer elements peel off the housing, the ratio of A to B increases. This is similar to
the measurement in air.
•
When transducer element is cracked, several other resonant points may be obtained.
•
When transducer element split up, resonant point may be not obtained at the frequency "Fo".
Fo Fr
Frequency
Impedance
Fo: Resonant frequency
Fr: Reverse resonant point
A
B