If they were phased, they would certainly be fazed.

Brian

Bev Christian 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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