Today's Message Index:
----------------------
1. 08:34 AM - Re: Re: Electronic Ignition spark advance signal boost CORRECTION (Robert L. Nuckolls, III)
2. 09:54 AM - Lithium: State of the technology (Robert L. Nuckolls, III)
3. 02:32 PM - Interesting Product Alert (Robert L. Nuckolls, III)
4. 04:52 PM - Re: Interesting Product Alert (Robert L. Nuckolls, III)
5. 06:52 PM - Re: Interesting Product Alert (Sebastien)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Electronic Ignition spark advance signal |
boost CORRECTION
At 07:38 PM 1/8/2018, you wrote:
>
>Bob,
>
>I missed this post earlier and noted your comment Re. this corrected
>diagram in the other thread.
>
>I'm hoping 4-5" from the case is close enough to tie into the ground
>wire for pin 1 input? As I mention in the other thread, for some
>reason the ground wire on this unit is massive, around 12-14AWG.
Exactly what parameter is being conditioned by
the AD626?
The is a DIFFERENTIAL amplifier which offers
a larger image of the voltage presented to the
two inputs IRRESPECTIVE of the common mode
voltages. For example, you can tie the inputs
of the AD626 to the two terminals of an alternator
b-lead shunt that may be 28 volts or more ABOVE
ground and endowed with lots of trashy noise . . .
while seeking to amplify a 0-50 MILLIVOLT signal
across the shunt up to a 0-5 VOLT signal for
interpretation by the data acquisition system.
This means that where ever the (+) input of
the amplifier is tied, the (-) input is VERY
CLOSE BY. What ever the (+) input sees in terms
of voltages to be ignored, the (-) input must
see the SAME NOISE.
Can you scan a sketch of what you're attempting
to resolve with respect to wiring? What's the
sensor, where's it located, what excites
the sensor?
In all my many experiences with the AD626 and
cousins, the DISTANCE between points sampled
by the two inputs has never been more than inches
apart and usually millimeters apart conducted
to the amplifier on twisted pair of wires.
One such application had the AD626 looking at
a strain gage embedded in the core of a pitch
trim actuator attach bolt. I needed to resolve
MICROVOLTS of signal from 5 VOLTS of common
mode at the end of about 40 feet of twisted
pair that traversed the noisiest environs on
the aircraft.
This is a really capable device but unless
applied with understanding, the results will
disappoint. I'm unable to offer a considered
answer to your question without knowing more
about the physical layout of the system components.
Bob . . .
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Lithium: State of the technology |
A friend just sent me an interesting assessment
of the state of the technology for lithium batteries,
the 2018 edition. You can find this document at . . .
https://goo.gl/tD7VdQ
. . . don't have time right now to sift the details
but many of you have an interest in such things . . .
thought I would get it posted for access as your
interest dictates.
Bob . . .
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Interesting Product Alert |
There's a family of digital laser distance
measuring tools out there. Unlike the ultrasonic
range meters these instruments take a reading
on reflected light from the laser dot.
They're offered with a variety of built in
calculators for area and volume. Bought
one of the least expensive examples here:
https://goo.gl/d6Xmre
I bought the one with 80 meter range for ~30
dollars. The 40m range is only 16 dollars and
mailed to you from the US.
In the "inch" measurement mode, I supported
the device on my desk and measured distance to
the ceiling tiles . . . the white surface
was repeatedly reported at 65.629" A measurement
to the bottom of a decorative depression in the tiles
repeated at 65.747". From this I conclude that
the depression measured was about 0.020" deep.
I'll be using this to help level up some structure
on a friend's implement shed without having
to stand on any ladders, etc. Will report
any disappointments/amazements as they present . . .
when the weather gets warmer!
Bob . . .
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Interesting Product Alert |
>In the "inch" measurement mode, I supported
>the device on my desk and measured distance to
>the ceiling tiles . . . the white surface
>was repeatedly reported at 65.629" A measurement
>to the bottom of a decorative depression in the tiles
>repeated at 65.747". From this I conclude that
>the depression measured was about 0.020" deep.
I failed to point out that the above experiment was
a demonstration of resolution and repeatability,
not of accuracy. The specified accuracy of my
particular device is +/-2 mM or +/-0.078 inches.
Still, pretty impressive in terms of slicing beams
of light into millimeter chunks . . . ain't 'lectronics
wunderful?
Bob . . .
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Interesting Product Alert |
What is the angle measurement it mentions? Does it work as an inclenometer
as well?
On Tue, Jan 9, 2018 at 4:51 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> In the "inch" measurement mode, I supported
> the device on my desk and measured distance to
> the ceiling tiles . . . the white surface
> was repeatedly reported at 65.629" A measurement
> to the bottom of a decorative depression in the tiles
> repeated at 65.747". From this I conclude that
> the depression measured was about 0.020" deep.
>
>
> I failed to point out that the above experiment was
> a demonstration of resolution and repeatability,
> not of accuracy. The specified accuracy of my
> particular device is +/-2 mM or +/-0.078 inches.
>
> Still, pretty impressive in terms of slicing beams
> of light into millimeter chunks . . . ain't 'lectronics
> wunderful?
>
>
> Bob . . .
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|