4. Operation  28 
 
 
 
ޟSTCޠ(STC curve) 
Make STC a yellow display, press          or the [ENT] key, and select it from the following, set content. 
Set content  㧦SHORT/MIDDLE/LONG 
SHORT 㧦40log is selected by the STC curve on a primary (secondary) side. 
MIDDLE  㧦30log is selected by the STC curve on a primary (secondary) side.
LONG
  㧦20log is selected by the STC curve on a primary (secondary) side. 
Select the curve by        and press the [ENT] key. 
 
  The STC curve is set to “LONG" regardless of the setting by here when setting it to an auto gain. 
ޟINNERޠ(Inner hull offset) 
Make INNER a yellow display, press          or the [ENT] key, and select it from the following, set content. 
Set content  㧦OFF/1/2/3/4/5 
OFF
㧦The offset of inner Hull is not put on a primary (secondary) side. 
1  㧦The offset of +4dB is set to the gain on a primary (secondary) side.
2  㧦The offset of +8dB is set to the gain on a primary (secondary) side. 
3  㧦The offset of +12dB is set to the gain on a primary (secondary) side. 
4  㧦The offset of +16dB is set to the gain on a primary (secondary) side. 
5  㧦The offset of +20dB is set to the gain on a primary (secondary) side. 
Select the content by         and press the [ENT] key. 
 
ޟKEELޠ(Keel correction) 
Make KEEL a yellow display, press          or the [ENT] key, and the numerical value (initial value 0.0) is 
displayed. 
The numerical value becomes large when      key is pressed, and when      key is pressed, the 
numerical value becomes small. 
The keel correction can be set in 0.1m unit within the range of 0.0㨪9.9m. 
When the setting of the correction value finishes, press the [ENT] key.