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4. ADJUSTMENT
4-12
4.3
External Noise and Interference Check
4.3.1
External noise check
Noise level can be measured (without transmission) at the “GENERAL” on the self test.
Preparation
1. Press the [MENU] key.
2. Press
▲
to move the cursor to the top of the screen.
3. Press
◄
several times to select “MENU 1.”
4. Press
▼
several times to select TEST.
5. Press
◄
to choose GENERAL.
6. Press the [F1] key.
If the NL is –5 or more, the unit is receiving affects of interference. In this case, check the
following points.
▪
Grounding of the transducer unit
▪
Noise source around the transceiver unit
▪
Distance between the transducer cable and ship’s power line.
Self test (GENERAL)
Содержание CI-88
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