Bev, I'll bet they were enlighten after that.

Donald


At 06:59 AM 6/20/2007, you wrote:
>Speaking of "keep the various grounds apart and connected
>correctly" I once worked for a company (NOT Nortel, they know better)
>that when I insisted that we have ESD protection in the building, they
>hooked all the assemblers to the electrical outlets on the shop floor.
>Gulp.
>Bev
>RIM
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
>Sent: Wednesday, June 20, 2007 2:32 AM
>To: [log in to unmask]
>Subject: Re: [TN] Different Types of Ground
>
>Wee is asking on good grounds and Donald's reply is excellent. I want
>add this, Wee:
>when you perform electrical tests, it's important to connect the probes
>to the adequate ground or return, as some call it. Checking digital
>signals with probes on analogue ground (AGnd, AG) can give very
>misleading results, as well as doing analogue measurements connected to
>digital ground (DGnd, DG), just to give example. As Donald explained,
>it's VERY important to keep the various grounds apart and connected
>correctly.
>Inge
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Donald Kyle
>Sent: den 19 juni 2007 14:36
>To: [log in to unmask]
>Subject: Re: [TN] Different Types of Ground
>
>Hello, Wee Mei
>
>In the broadest sense GROUND refers to the return wire or object or path
>that is connected to a voltage source (clouds, batteries, power
>supplies, power lines).
>
>With regard to electronic equipment, the different types of grounds are
>just names for different return paths to a power supply.
>
>For example, if a circuit board had an analog section and a digital
>section the circuit designer may have two or three different power
>supplies for each section.
>
>The digital power supplies most likely would have a common connection
>perhaps call DIGITAL GROUND and the analog sections would have a common
>connection called ANALOG GROUND.
>
>Depending on the circuit design, these Grounds or return paths may be
>connected together at some point or not.
>
>In the case of lighting or static electricity (ESD), objects like you
>and me or a door knob or your favorite electronic device can become the
>GROUND path to earth.  In these cases the ground path through the object
>would be considered an unwanted ground path.
>
>Chassis ground can refer to the metal box that electronic circuits are
>housed in or the frame of your car.
>
>If you are looking at AC power in your home for example, there are two
>types of ground.  One is called the safety ground (green wire) and the
>other is called the neutral or ground (white wire).  These two are
>connected together at the breaker box.  The safety ground is connected
>to the metal chassis of the electrical device to protect you from
>unwanted electrical currents.
>
>I hope this helps.
>
>Donald Kyle
>
>
>
>
>At 03:25 AM 6/19/2007, you wrote:
> >Hello,
> >
> >Can someone share with me the different types of grounds : ESD ground,
> >digital ground, analog ground, chassis ground, earth ground, electrical
>
> >ground, anymore other types of grounds . .  and their functions and
> >applications.
> >
> >Thanks in advance.
> >Wee Mei
> >
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