September
2017
Sentinel V SC and RT Operation Manual
Page 242
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Description: #ZD uses firmware switches to tell the Sentinel V Real-Time the types of data to collect and
process. The Sentinel V Real-Time always collects header data, fixed and variable leader
data, and checksum data. Setting a bit to one tells the Sentinel V Real-Time to collect and
process that data type. The bits are described as follows:
v
= Velocity
p
= Percent good
*
= Reserved
c
= Correlation
s = Status
*
= Reserved
a
= Echo Intensity
*
= Reserved
*
= Same as WD
command
#ZF – Vertical Beam Blanking Distance
Purpose:
Moves the location of first depth cell away from the transducer head to allow the transmit
circuits time to recover before the receive cycle begins.
Format:
#ZFnnn
Range:
nnnn = 0 to 9999 cm
Default:
See Table 34, -1 = same as WF command
Recommended Setting. The default setting for this command is recommended for most applications.
Software warning: Changing this command may cause problems with TRDI display and processing
software.
Description: #ZF positions the start of the first depth cell at some vertical distance from the transducer
head. This allows the Sentinel V Real-Time transmit circuits time to recover before begin-
ning the receive cycle. In effect, #ZF blanks out bad data close to the transducer head, thus
creating a depth window that reduces unwanted data in the ensemble.
Table 34.
Vertical Beam Blank Distance
System
Blank Distance (Default)
Sentinel V 100m (307.2kHz)
160 cm
Sentinel V 50m (491.52kHz)
100 cm
Sentinel V 20m (983.04kHz)
-1 = same as WF command
#ZJ – Vertical Beam Gain
Purpose:
Allows the Sentinel V Real-Time to reduce receiver gain by 40 dB.
Format:
#ZJn
Range:
n = 0 (low), 1 (high), -1 = same as WJ command
Default:
#ZJ-1
Recommended Setting. The default setting for this command is recommended for most applications.
Description: #ZJ0 tells the Sentinel V Real-Time to reduce receiver gain by 40 dB. This may increase
data reliability in shallow-water applications where there is a high content of backscatter
material. #ZJ-1 (the default) uses the normal receiver gain (same as the WJ command).
