Furuno FCV-1200L Service Manual page 44

Defective Transducer (Example 1)
Normal Transducer
Defective Transducer(Example 2)
Defective Transducer(Example 3)
Vs: 20Vpp, R: 1 k ohm, Oscilloscope: 1 m sec./div., 2 V/div.
Figure 7.4 Resonant characteristics of normal and defective transducer "Type 50B-12"
The section 7.4 shows sample waveforms of normal transducers.
The waveforms shown in right side are measured in water (depth is 2 m, more or less), and the
waveforms shown in left side are measured in air.
As mentioned above, the waveforms are differ with the measuring condition, therefore, the
recommendable way to check the transducer is to compare the waveforms between normal and
doubtful transducers by the same test instruments and measuring conditions at once.
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