That "summation" supply Job

[steptoe]

[quote name='Andy

 

[Sidewinder]

Steps,

FWIW I won't use a neon either, seen to many catastrophic failures of resistors!

Andy,

I think my KEW does too, just noticed it the other day as I "normally" put the probe onto the N/E 1st.

Will check next time I get it out of the box.

KEW1710 IIRC, the one with the V readout as well as the LEDS.

 

[Sidewinder]

Steps,

FWIW I won't use a neon either, seen to many catastrophic failures of resistors!

Andy,

I think my KEW does too, just noticed it the other day as I "normally" put the probe onto the N/E 1st.

Will check next time I get it out of the box.

KEW1710 IIRC, the one with the V readout as well as the LEDS.

 

[Andy™]

but it wont on a broken neutral.will it.?

yes.

as soon as the probe touches somthing live (with other probe connected to nothing) it will give a warning.

connect other end to neutral, and it will still give a voltage warning, but wont display a voltage (needs another reference for that part to work)

 

[Andy™]

but it wont on a broken neutral.will it.?

yes.

as soon as the probe touches somthing live (with other probe connected to nothing) it will give a warning.

connect other end to neutral, and it will still give a voltage warning, but wont display a voltage (needs another reference for that part to work)

 

[steptoe]

[quote name='Andy

 

[steptoe]

[quote name='Andy

 

[Sidewinder]

Steps,

I'm not! going out to the van now, iit's cold & wet in Swansea!

I have to potter tomorrow tidy the van empty some stuff load up and move a few things around I'll have a play with mine and come back on this.

I suspect that the electronics use the fact that you are holding it, i.e. act the same as a neon! Thus you agan become part of the cct.

With clever trickery you can trigger the neons from almost nano amps of current flow.

 

[Sidewinder]

Steps,

I'm not! going out to the van now, iit's cold & wet in Swansea!

I have to potter tomorrow tidy the van empty some stuff load up and move a few things around I'll have a play with mine and come back on this.

I suspect that the electronics use the fact that you are holding it, i.e. act the same as a neon! Thus you agan become part of the cct.

With clever trickery you can trigger the neons from almost nano amps of current flow.

 

[steptoe]

Steps,I'm not! going out to the van now, iit's cold & wet in Swansea!

I have to potter tomorrow tidy the van empty some stuff load up and move a few things around I'll have a play with mine and come back on this.

I suspect that the electronics use the fact that you are holding it, i.e. act the same as a neon! Thus you agan become part of the cct.

With clever trickery you can trigger the neons from almost nano amps of current flow.

Im just being pedantic now arent I.?

 

[steptoe]

Steps,I'm not! going out to the van now, iit's cold & wet in Swansea!

I have to potter tomorrow tidy the van empty some stuff load up and move a few things around I'll have a play with mine and come back on this.

I suspect that the electronics use the fact that you are holding it, i.e. act the same as a neon! Thus you agan become part of the cct.

With clever trickery you can trigger the neons from almost nano amps of current flow.

Im just being pedantic now arent I.?

 

[ProDave]

Steps,FWIW I won't use a neon either, seen to many catastrophic failures of resistors!

But it's NOT just a resistor between you and the live wire, it's a resistor AND a neon lamp.

Resistors normally fail open circuit, and I've yet to see a neon tube fail anything other than open circuit.

My own neon will glow dimly on a live wire even if you are NOT touching the metal end cap, thus showing how little current is actually needed to light a neon. So in that respect no different to a volt stick or any other "one probe" voltage indicator.

I like the security of using a neon screwdriver for terminal screws. NOT because I am using it as my primary means of "test for dead" but as an extra sanity check in case despite my testing I have overlooked something and accidentally left something live. That to me is it's main function.

 

[ProDave]

Steps,FWIW I won't use a neon either, seen to many catastrophic failures of resistors!

But it's NOT just a resistor between you and the live wire, it's a resistor AND a neon lamp.

Resistors normally fail open circuit, and I've yet to see a neon tube fail anything other than open circuit.

My own neon will glow dimly on a live wire even if you are NOT touching the metal end cap, thus showing how little current is actually needed to light a neon. So in that respect no different to a volt stick or any other "one probe" voltage indicator.

I like the security of using a neon screwdriver for terminal screws. NOT because I am using it as my primary means of "test for dead" but as an extra sanity check in case despite my testing I have overlooked something and accidentally left something live. That to me is it's main function.

 

[Andy™]

OK, so I can stick a piece of wood on a live wire and it will show me a result.?

good,.if the wood is able to conduct then it probably would. if i remember tomorrow, i may even try it

cos I always thought an electric current required a path to earth to be evident.evidently not

perhaps someone can tell me this is a massive fallicy in ohms law .

not sure exactly how it works, but megger mark may be able to

 

[Andy™]

OK, so I can stick a piece of wood on a live wire and it will show me a result.?

good,.if the wood is able to conduct then it probably would. if i remember tomorrow, i may even try it

cos I always thought an electric current required a path to earth to be evident.evidently not

perhaps someone can tell me this is a massive fallicy in ohms law .

not sure exactly how it works, but megger mark may be able to

 

[Sidewinder]

Steps,

NO, yes, no, yes oh I don't know!

Prodave,

Carbon resistors yes the predominant failure mode is to fail o/c.

As is the same with a neon.

HOWEVER, do you want to take the risk?

Remember very often when GLS lamps fail the ionisation in the envelope allows such a current to flow that it trips the mcb!

 

[Sidewinder]

Steps,

NO, yes, no, yes oh I don't know!

Prodave,

Carbon resistors yes the predominant failure mode is to fail o/c.

As is the same with a neon.

HOWEVER, do you want to take the risk?

Remember very often when GLS lamps fail the ionisation in the envelope allows such a current to flow that it trips the mcb!

 

[Andy™]

But it's NOT just a resistor between you and the live wire, it's a resistor AND a neon lamp. Resistors normally fail open circuit, and I've yet to see a neon tube fail anything other than open circuit.

My own neon will glow dimly on a live wire even if you are NOT touching the metal end cap, thus showing how little current is actually needed to light a neon. so in that respect no different to a volt stick or any other "one probe" voltage indicator.

normally fails open circuit isnt good enough. what about the time when it fails closed and kills you.

 

[Andy™]

But it's NOT just a resistor between you and the live wire, it's a resistor AND a neon lamp. Resistors normally fail open circuit, and I've yet to see a neon tube fail anything other than open circuit.

My own neon will glow dimly on a live wire even if you are NOT touching the metal end cap, thus showing how little current is actually needed to light a neon. so in that respect no different to a volt stick or any other "one probe" voltage indicator.

normally fails open circuit isnt good enough. what about the time when it fails closed and kills you.

 

[Sidewinder]

Prodave,

Not quite the same as the non contact types though is it.

They are not in contact with the live conductor, they probably pick up the em field emitted.