<< ---------------------- I'm on 640 x 480 ---------------------------------- >>
<< ---- i have to 'pan' left and right if its much wider than this ------- >>
Hi Ryan,
I've had a bit of a think,
and i would like you to try something.
I would like you to move the ground wire on that amplifier unit over
to the Thermocouple ground connection.
I am not sure about the fixings on the amplifier, but my guess is that
they are not internally connected to anything.
However, just to be sure, would you mind just temporarily removing
them and maybe putting a bit of cardboard under the amplifier,
maybe a bit of tape or something similar, it can be screwed back down
afterwards, i just want to be sure that there is only one ground track,
for this check.
The gauge, ... i agree, it doesn't look like it has an earth/ground
connection at all. Thats ok, it doesn't need to have.
The lamp in the gauge does look like it is not connected in any way to
the circuitry involved with it.
The unit is supposed to run through a 1 Ampere fuse, so it takes less
than an amp, i don't see a problem running it through the braid, thats
the shielding around the thermocouple signal wire.
But it might be interesting to see just how much current it takes.
But don't worry about the current for this check.
I've included a pic, partly copied from the links you gave me.
Doing this should give a similar situation as you had when you gave
it a separate supply.
Lets see if this gives some sensible results, i have my fingers
crossed !
Cheers, John
<< ---- i have to 'pan' left and right if its much wider than this ------- >>
Hi Ryan,
I've had a bit of a think,
and i would like you to try something.
I would like you to move the ground wire on that amplifier unit over
to the Thermocouple ground connection.
I am not sure about the fixings on the amplifier, but my guess is that
they are not internally connected to anything.
However, just to be sure, would you mind just temporarily removing
them and maybe putting a bit of cardboard under the amplifier,
maybe a bit of tape or something similar, it can be screwed back down
afterwards, i just want to be sure that there is only one ground track,
for this check.
The gauge, ... i agree, it doesn't look like it has an earth/ground
connection at all. Thats ok, it doesn't need to have.
The lamp in the gauge does look like it is not connected in any way to
the circuitry involved with it.
The unit is supposed to run through a 1 Ampere fuse, so it takes less
than an amp, i don't see a problem running it through the braid, thats
the shielding around the thermocouple signal wire.
But it might be interesting to see just how much current it takes.
But don't worry about the current for this check.
I've included a pic, partly copied from the links you gave me.
Doing this should give a similar situation as you had when you gave
it a separate supply.
Lets see if this gives some sensible results, i have my fingers
crossed !
Cheers, John