6-7
6.3 Surface Automatic Tracking Layer
6.3.1 Top Lock (TOP)
Function Absolute Current of surface: If a current measurement layer depth setting of A
layer is set to a top lock (TOP), according to a transmitting pulse width setting and a
surface measurement condition, the measurement layer depth is changed
automatically. (*1)
This is convenient for the measurement of the surface layer.
Operation Standard Menu: [DEPTH] key/Current measurement layer Depth setting menu/
A layer: 12 m/Top lock (Finishing: [DEPTH] key)
Selection Frame Menu: [□] key/ Current speed and direction is enclosed by a
frame/[MENU] key/ Current speed and direction menu/ A layer: 12 m/Top lock
*1 The minimum measurement layer depth of a current is 8 m.
JLN-652 current meter follows manual operation or sea bottom depth, and changes transmitting pulse width.
The shallowest current layer that can be measured changes with transmitting pulse width.
A top lock is an effective function in the following case.
When transmitting pulse width is changed manually frequently,
When a current is measured in an ocean area about shallower than 40 m,
When the current of a shallower layer is always measured.
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