JDC Electronic SA Speedwatch - Manual (Page 3)

3
3. Start up the Instrument
DISPLAY
From the factory, the SPEEDWATCH is in a low
power state, with the time flashing. Press any
button to enter normal mode.
The SPEEDWATCH is now in Manual Mode;
it will only receive data from the transmitter
when the CHRONO button is pressed and the
impeller is rotating. The default speed is knnots,
which can be changed to mph, km/h, or m/s.
IMPELLER
The SPEEDWATCH impeller needs to be screwed
on to either the white fin mount (1), the large
black fin (2) or the rudder black fin mount
(3). The impeller is magnetized and creates a
magnetic pulse when rotating. This magnetic
pulse is received by the transmitter and
transmitted to the display. The display cannot
sense the impeller directly; the transmitter
must be on.
1
2
3
TRANSMITTER
The SPEEDWATCH Transmitter requires a 9V
battery to operate; this is included in your
system. To install the battery, gently pull the
cap exposing the battery compartment. Install
the 9V battery and replace the battery cap. Be
sure to press the cap back on fully to form the
water tight seal. Failure to do this could result
in the 9V battery failing. The electronics in
the SPEEDWATCH transmitter are completely
factory sealed. Do not attempt to open the case
exposing the electronics, or failure can occur.
It is not necessary to remove the battery except
for long period (winter storage) because the
power consumption is very low if no magnetic
field is received.
Red flashes appear on the bottom side when
the transmitter receives the magnetic signal
from the impeller.