36
ST60 Tridata Instrument Owner’s Handbook
Note: It is recommended that the speed calibration procedure is
carried out in conditions of minimum tidal drift.
To carry out a speed calibration, start the Intermediate calibration
procedure and use the speed key to proceed to the Calibration run
length screen (see sheet 1 of the Speed calibration flow chart). Proceed
with the speed calibration as follows:
1. With the Calibration Run Length screen displayed, press the trip
and reset keys together to enter adjust mode. In this mode, the
displayed run length flashes on and off.
2. Set the length of the intended calibration run, using either the trip
key to decrement or the reset key to increment the run length
value. You can set any value between 0.25 and 2.50.
3. Press trip and reset keys together to commence the speed
calibration. The Cal status screen is displayed. The text at the
bottom of the screen alternates between Strt 1 and the calibration
factor (CF) currently applied.
4. Start first outward leg of the calibration run and as you pass the
start point, press the speed key, so that the text out shows at the
bottom of the screen. As the calibration run proceeds, the
displayed value will increment.
5. At the end of the measured distance on the outward leg, press the
speed key again so that:
• The text rEtrn is flashing at the bottom of the screen.
• The displayed distance freezes. Note that this value will not be
the same as the measured distance due to errors introduced by
tidal flow.
6. Turn the vessel round, start the return leg and as you do so, press
the speed key so the rEtrn legend stops flashing and the displayed
value increments.
7. At the end of the return leg, press the speed key to end the
calibration run. At this point:
• The text Strt 2 alternating with the new calibration factor is
displayed at the bottom of the screen.
• The displayed distance freezes. This value should be very close
to the actual (measured) distance of the calibration run.
8. Press the depth and speed keys together, to store the new
calibration factor.
040_2c04.p65 09/08/99, 09:3236
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