SAL R1a Easy Tank User Manual No. 703852
703852A04, SIMRAD SAL R1a Easy Tank User Manual.docx 16 (25)
Up to ten different speed points can be calibrated for, spread to speeds both ahead and
astern. Speeds between the calibration points are interpolated automatically, except the
area nearest zero, which uses its nearest calibration factor down (up) to speed zero.
The Multiple Point Calibration can be ENABLED and DISABLED in menu C3. The
change must be stored by pressing the ENTER button.
The calibration Trial runs and calculations shall be done and defined for each speed point
in the same way as described under Single Point Calibration above.
To be able to enter the expected (true) speed value in the C3 menu it is also necessary to
define/calculate the actual true speed from the reference (DGPS) system for each speed
trial run.
Do not enter any values in menu C3 until all speed trials are completed and calculated.
Before initial calibration runs, make sure:
that correct TRU TC factor is set in menu C4 (see above);
the MULTI-P CAL is DISABLED (Menu C3, default is ENABLED) if any points
have entered values or just assure that all ten points are set to 0%;
Due to the interpolation between the calibration factors the MULTI-P CAL should be
DISABLED during all calibration runs, also when making a later run for an extra speed
calibration point.
The MULTI-P CAL can be ENABLED and DISABLED in menu C3.
3.9 Averaging Speed Constants
Refer to paragraph 1.4 Menu mode above how to move in the Menu System.
If the speed output is fluctuating in an improper manner it may be possible to level it out
with a filtering time constant. Two different constants can be set, one for a lower speed
range – menu S1 –, for faster reaction of speed changes, and one for a higher speed range
– menu S3 – normally needing more equalized speeds. The threshold between low and
high averaging speed constants can also be set in menu S2 as desired for the instant use.
3.10 Software revisions
The SD4 display software revision can be found in menu LP9 in the SD4 Menu System.
The R1a / WTU software revisions can be found in menu M6 in the WTU Menu System.
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