Koden CVR-010, Operation Manual, Page: 42 / 114

CVR–010
Basic Operating Instructions
32
7.6. Adjusting TVG Level Manually
(continued – 2/2)
< CAUTION >
With the TVG set at its maximum level during shallow depth operation,
extremely weak bottom echo may result, triggering the bottom–missing
alarm.
Figure 7-23 Parameter Indication for Manual TVG Adjustment – Example
(1) Press

twice to activate the manual control
( MANUAL )
mode.
- The TVG level indication will then be
highlighted as in the example at right.
(2) You can now select up to 31 TVG levels
( TVG = 0 , minimum to TVG = 30 , maximum) by
pressing

/

.
- Repeatedly press

to increase the TVG
level until satisfactory results are obtained.
- Too high level at shallow depths may,
however, weaken the bottom echo as well,
leading to unstable depth reading operation.
- Pressing

decreases the suppression
level.
(3) To return to the AUTO mode, press

.
Current TVG level
Manual Control