One possible thing is the calibration is way off.
Joe
Coquina
On 8/4/2020 12:21 PM, General Gao wrote:
I wanted to come back to this thread. Did some cleaning on land, had
my daughter rotated the Hall effect sensor, the needle moved, thought
it was all good. We later launched the boat and it turned out that the
reading was off still. It read about half of what it was supposed to be.
What would this indicate?
Thanks,
Bo
On Sat, May 23, 2020 at 1:32 PM Joe Della Barba via CnC-List
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
Dielectric grease is made specifically for electrical use. Any
auto parts store has it for about $5.
Joe
Coquina
On 5/23/2020 12:54 PM, General Gao via CnC-List wrote:
that is what I am thinking. Would vaseline work?
Thank you,
Bo
On Mon, May 18, 2020 at 3:49 PM Della Barba, Joe via CnC-List
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
Put some dielectric grease on the connections ;)
*/Joe Della Barba Coquina C&C 35 MK I/*
*/www.dellabarba.com <http://www.dellabarba.com>/*
*From:*CnC-List [mailto:cnc-list-boun...@cnc-list.com
<mailto:cnc-list-boun...@cnc-list.com>] *On Behalf Of
*General Gao via CnC-List
*Sent:* Monday, May 18, 2020 3:41 PM
*To:* cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
*Cc:* General Gao <general.z....@gmail.com
<mailto:general.z....@gmail.com>>
*Subject:* [EXTERNAL] Re: Stus-List speedometer - C&C 35 Mk2
Reporting back. followed the guide and verified the
transmitter had resistance of 1787ohms, verified there was
VAC output when the paddle was turning fast (couldn't get to
the 5knots as boat is on land). Decided to sand the
connectors, and put it back, tested again, and it
worked...the connectors looked without rust, a bit surprised.
Thank you everyone for the kind help!
Stay safe, stay healthy.
Regards,
Bo
On Mon, May 18, 2020 at 11:42 AM General Gao
<general.z....@gmail.com <mailto:general.z....@gmail.com>> wrote:
thank you everyone. I really appreciate the information.
I will go check and report back.
Stay safe!
Bo
On Mon, May 18, 2020 at 8:32 AM Ken Heaton via CnC-List
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
Yup, that's correct. If there are only two wires
coming from the paddlewheel transducer, it is likely
this 'generator' type as a more modern hall effect
transducer will have at least three wires (I think).
Of course a broke wire or bad connection anywhere
between the transducer and the instrument will
cause it all to not work. We would just pull the
transducer and connect it directly to the back of
the instrument to see what happens.
From the Troubleshooting section (last page) of
the pdf I linked:
TROUBLESHOOTING
DISPLAY READS ZERO- The problem could be either the
transmitter or the display. Please follow the
proceeding steps to determine cause of the problem-
A. Measure the two wires of the transmitter with
an ohm meter for resistance value of
approximately 2000 ohms (2K ohms). Do not spin
the paddlewheel.
a. If unit is good, then check paddlewheel
for any broken fins or missing magnets.
b. If unit is open (infinite resistance) then
unit needs replacing.
B. Measure with an AC voltmeter when the
paddlewheel is spinning. You should get
approximately 1.0 VAC at about 5 knots of speed
when unloaded (not hooked up to display).
INTERMITTENT READINGS- Keep the unit wired as normal
and add an AC voltmeter to where the input wires of
the transmitter are connected. Motor or sail as usual-
A. If an AC voltage is being produced but no
speed indication appears on display, then the
problem is in the display.
B. If readings only occur when voltages are
produced, then the paddlewheel is not always
turning. Clean paddlewheel first and be sure it
spins freely, and then try again. If the results
are the same then paddlewheel may need replacing.
On Mon, 18 May 2020 at 09:18, Josh Muckley via
CnC-List <cnc-list@cnc-list.com
<mailto:cnc-list@cnc-list.com>> wrote:
So if I understand it correctly, the theory of
operation for these generator style knot meters
would simply be a 2 wire system and a voltage
developed between the two? I would expect that a
simple initial test would be for continuity
between the two wires with the wheel stopped.
Then spin the wheel and check for voltage
proportional to the speed of the wheel.
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Mon, May 18, 2020, 07:38 Joe Della Barba via
CnC-List <cnc-list@cnc-list.com
<mailto:cnc-list@cnc-list.com>> wrote:
There are (were) some generator knotmeters.
Coquina came with one when
we bought her. If memory serves, it topped
out at 10 or 12 knots and it
was always fun to peg it :)
Joe
Coquina
On 5/18/2020 5:32 AM, Ken Heaton via CnC-List
wrote:
> Have you looked at this web page? This
takes yo to the manuals for SR
> Mariner Instruments (since 1973):
>
https://srinstruments.com/manuals#mariner_manuals
<https://protect2.fireeye.com/v1/url?k=8594dd2f-d8e74e4e-8594f458-ac1f6b44e86e-dd5873740a9ca4d3&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fmanuals%23mariner_manuals>
>
> The only SR Mariner Knotmeter I ever worked
on (on a friend's C&C 35
> Mk.I 1973) was self powered. In other
words, no external power was
> needed (except for the backlight for the
instrument face for night
> use), the paddle-wheel seemed to be a
generator.
>
> More info here:
https://srinstruments.com/r/manuals/public/MANSELF.pdf
<https://protect2.fireeye.com/v1/url?k=02beb11d-5fcd227c-02be986a-ac1f6b44e86e-410501274e5fda22&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fr%2Fmanuals%2Fpublic%2FMANSELF.pdf>
>
> Ken H.
>
_______________________________________________
Thanks everyone for supporting this list with
your contributions. Each and every one is
greatly appreciated. If you want to support
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with
your contributions. Each and every one is
greatly appreciated. If you want to support the
list - use PayPal to send contribution --
https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your
contributions. Each and every one is greatly
appreciated. If you want to support the list - use
PayPal to send contribution --
https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your
contributions. Each and every one is greatly appreciated.
If you want to support the list - use PayPal to send
contribution -- https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution --https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions.
Each and every one is greatly appreciated. If you want to support
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
