GS Meter logging

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rowster_c

GS Meter logging

I mentioned making a GS meter for logging by drilling
2 holes in the front and sending the wires to a logging
device.
Unfortunately I noted that when I accidentally left
the meter plugged in all night, when I checked it in
the morning, the reading was a bit low. I unplugged it,
and plugged it in a few minutes later, and the reading
returned to an expected level. I repeated this some
days later. Unfortunately I think this meter is not
suitable to be left permanently plugged in. I suspect either
the heat from the mains wires may be sending the reading
off, or the the capacitor tolerances inside it may give
false readings when heated up for some hours or something
similar. I think if we get an industrial strength version
of the GS meter it should be straight forward to measure
that when the reading goes up and also varies wildly, so does
the blood sugar level, which would be quite important
for us.

Rowan.

BiBrun

Re: GS Meter logging

If it was a cool morning that could be the explanation too?
You'd think heating from the mains would stabilize after an hour or
so. I've gotten lowish reading on battery powered meters early
in the morning. I imagine it's temperature and maybe before the
TV stations turn on, etc.

Did you check to see if the reading went up if there was some stronger
signal?

It's been said that for digital signals a factor of 2 is as close as
the $25000 meters get...

Bill

On 9/12/07, rowster_c <[hidden email]> wrote:

>
> I mentioned making a GS meter for logging by drilling
> 2 holes in the front and sending the wires to a logging
> device.
> Unfortunately I noted that when I accidentally left
> the meter plugged in all night, when I checked it in
> the morning, the reading was a bit low. I unplugged it,
> and plugged it in a few minutes later, and the reading
> returned to an expected level. I repeated this some
> days later. Unfortunately I think this meter is not
> suitable to be left permanently plugged in. I suspect either
> the heat from the mains wires may be sending the reading
> off, or the the capacitor tolerances inside it may give
> false readings when heated up for some hours or something
> similar. I think if we get an industrial strength version
> of the GS meter it should be straight forward to measure
> that when the reading goes up and also varies wildly, so does
> the blood sugar level, which would be quite important
> for us.
>
> Rowan.
>
>
>

[Non-text portions of this message have been removed]

rowster_c

Re: GS Meter logging

I'll check it a few more times. I unplugged it after 10 hrs
use then plugged back in 3 mins later, figure changed
significantly. Yes heat might be a bad guess, maybe something
to do with diode saturation or capacitor Res tolerances
now I am just guessing. Try again 2 more times.

Rowan

--- In [hidden email], "Bill Bruno" <wbruno@...> wrote:
>
> If it was a cool morning that could be the explanation too?
> You'd think heating from the mains would stabilize after an hour or
> so. I've gotten lowish reading on battery powered meters early
> in the morning. I imagine it's temperature and maybe before the
> TV stations turn on, etc.
>
> Did you check to see if the reading went up if there was some
stronger
> signal?
>

rowster_c

Re: GS Meter logging

Tested twice more, left on from late at night till
morning and lunchtime. First time: pull out, earth pins to
metal sink, then plug in after 1 minute. Before unplugged
avg 215, after replugged avg 235. Did it again, rushing
to get figures, did not earth pins I think, in the 400s, dropped
by 25 after replugged.

Regards Rowan.

--- In [hidden email], "rowster_c" <rowanc@...> wrote:

>
> I'll check it a few more times. I unplugged it after 10 hrs
> use then plugged back in 3 mins later, figure changed
> significantly. Yes heat might be a bad guess, maybe something
> to do with diode saturation or capacitor Res tolerances
> now I am just guessing. Try again 2 more times.
>
> Rowan
>
> --- In [hidden email], "Bill Bruno" <wbruno@> wrote:
> >
> > If it was a cool morning that could be the explanation too?
> > You'd think heating from the mains would stabilize after an hour

or
> > so. I've gotten lowish reading on battery powered meters early
> > in the morning. I imagine it's temperature and maybe before the
> > TV stations turn on, etc.
> >
> > Did you check to see if the reading went up if there was some
> stronger
> > signal?
> >
>