Ohms and Temperature guage.

Ok, the 101 had a capliary guage on it origional which was defunct when I
got him. I had for some reason a spare IIa speedo which had a electronic
temp guage on which I placed on the 101's speedo in place of the capliary
one.

I fitted a standard Rangie V8 temp sendor circ 1980's but this overread on
the guage. I tested the temp on the top hose on a run with a maplin digital
temp sensor and before I cooked it I found the running temp to be ok at 86
degrees.

To bring the temp guage into line I bought a shot in the dark variable
resistor from maplins and linked it in , tweaked until the guage reads
normal an tickover after a run etc.

I measured the resistance of the pot hoping to just install a resistor in
line to prevent the pot getting accidentally adjusted etc etc. It reads at
0.35 ohms.... whats that then? Any profs out there care to let me know the
coloring of the resistor I need please.

Also though this worthy of sharing for any one else with a V8 or other
engine fitted to a series / 101 vehicle.

Lee D


--

www.lrproject.com

Workshop photos from Landrover repairs
& other such tinkerings.
Home of Percy the Jag powered Landrover

Lee_D wrote:

>
> I measured the resistance of the pot hoping to just install a resistor in
> line to prevent the pot getting accidentally adjusted etc etc. It reads at
> 0.35 ohms.... whats that then? Any profs out there care to let me know the
> coloring of the resistor I need please.

Do not worry about the color codes on this resistor.
You'll find the codes somewhere by Googling if you really want to know.
Just go to your local electronics store and ask for a 0.35 ohms
resistor.
Which b.t.w. is almost nothing. Hardly any resistance so not sure this
will be your solution really.
Kind regards,
Erik-Jan.

On Mon, 07 Mar 2005 00:59:01 +0100, Erik-Jan Geniets wrote:

> Just go to your local electronics store and ask for a 0.35 ohms
> resistor. Which b.t.w. is almost nothing.

Agreed, unless you are very careful about terminations you'll have
more resistance from them than the resistor. Are you sure the meter
wasn't reading 0.35 k ohms?

--
Cheers [email protected]
Dave. pam is missing e-mail

Hi Lee, try putting it in paralell i.e. from the output terminal to earth,
you'll get a different reading but doing the same job, hopefully with a
easier resistor to source. BTW .35 Ohm = 350 Meg Ohm HTH.

Roy.

"Lee_D" <[email protected]> wrote in message
news:[email protected]...
> Ok, the 101 had a capliary guage on it origional which was defunct when I
> got him. I had for some reason a spare IIa speedo which had a electronic
> temp guage on which I placed on the 101's speedo in place of the capliary
> one.
>
> I fitted a standard Rangie V8 temp sendor circ 1980's but this overread on
> the guage. I tested the temp on the top hose on a run with a maplin
> digital temp sensor and before I cooked it I found the running temp to be
> ok at 86 degrees.
>
> To bring the temp guage into line I bought a shot in the dark variable
> resistor from maplins and linked it in , tweaked until the guage reads
> normal an tickover after a run etc.
>
> I measured the resistance of the pot hoping to just install a resistor in
> line to prevent the pot getting accidentally adjusted etc etc. It reads at
> 0.35 ohms.... whats that then? Any profs out there care to let me know the
> coloring of the resistor I need please.
>
> Also though this worthy of sharing for any one else with a V8 or other
> engine fitted to a series / 101 vehicle.
>
> Lee D
>
>
> --
>
> www.lrproject.com
>
> Workshop photos from Landrover repairs
> & other such tinkerings.
> Home of Percy the Jag powered Landrover
>
>

BTW .35 Ohm = 350 Meg Ohm

Are we sure? Rubbish! They're different by a factor of 100,000,000.

Just as 0.35 ohm is negligible (i.e. as good as a short circuit) as
previously pointed out, 350 Meg Ohm is as good as an open circuit.

You'll get 0.33 ohm wirewound resistors fairly readily (e.g. at Maplin)
but they don't tend (from memory) to be colour coded.

As Erik-Jan points out, this might not be your solution but it'll be
cheap to try!

LR90 wrote:
> Hi Lee, try putting it in paralell i.e. from the output terminal to earth,
> you'll get a different reading but doing the same job, hopefully with a
> easier resistor to source. BTW .35 Ohm = 350 Meg Ohm HTH.
>
> Roy.
>
Are you confusing Megohms MO (just read the O as omega!) with milliohms
mO. Both being rather out of scale for what one might expect?

Alistair
--
200Tdi Defender 90, 1990

Dougal wrote:
> BTW .35 Ohm = 350 Meg Ohm
>
> Are we sure? Rubbish! They're different by a factor of 100,000,000.

Too right, he means 350 milliOhm.

>
> Just as 0.35 ohm is negligible (i.e. as good as a short circuit) as
> previously pointed out, 350 Meg Ohm is as good as an open circuit.

There are plenty of applications, though not too many in a 101 Landy,
where you would use 350 milli-ohms as current sensing shunts. 1A though
350 milliOhm is 350mV, and a quite easy signal to measure.
> You'll get 0.33 ohm wirewound resistors fairly readily (e.g. at Maplin)
> but they don't tend (from memory) to be colour coded.
What kind of current is he likely to pass ? only milliamps surely ?

Steve