R1+R2 on 100mtrs 2.5

[grandfortune]

HI all,

can someone tell me what the R1&R2 reading on 100mtrs of 2.5mm would be

and has anyone got a table for working it out, been years since doing it but why do i remember 0.07 in my head, remember someone telliing me to think of james bond but cant seem to think why.

i assume there is a table somewhere in the big green book, but not getting my hands on it until the weekend

Cheers
Grand

 

[KAS1]

is that 2.5 mm 6491x or T&E ?

 

[Silly Sausage]

2.5 & 1.5 - 19.51
2.5 & 2.5 - 14.82

mOhm/m


Back of OSG!

 

[telectrix]

2.5/2.5 is 1.48 : 2.5/1.5 is 1.96.

 

[KAS1]

Looks like some maths don't add up lol

 

[Guest55]

im gonna go out on a limb here and speculate that 100m of 2.5/1.5 could be in the region of ooh , say 1.9 ohms ?

just saying
;-)

 

[telectrix]

close enough.

 

[Silly Sausage]

If the OP can manage to post the question on an internet forum, couldn't he have just looked the answer up on the interweb? :smilielol5:

 

[Guest55]

its the old "left me books in the van" line

always a pre-cursor to some sort of effort fail.

lol

 

[Deleted member 72666]

its the old "left me books in the van" line

always a pre-cursor to some sort of effort fail.

lol

....Or my friend's taken it with him on holiday!

 

[Guest111]

its the old "left me books in the van" line

always a pre-cursor to some sort of effort fail.

lol

Biff,I've left me smokes in the car,can you send us one? lol

 

[SPARTYKUS]

im gonna go out on a limb here and speculate that 100m of 2.5/1.5 could be in the region of ooh , say 1.9 ohms ?

just saying
;-)

Good God how did you work that out, have you got some kind of Cray computer brain

 

[moospark]

Good God how did you work that out, have you got some kind of Cray computer brain

Or a reel in the van.

 

[Guest55]

Good God how did you work that out, have you got some kind of Cray computer brain

well , one doesnt like to boast but........

;-)

 

[Rockingit]

Something like this, you mean? That you could also have found with a search on here to save me reposting it?

View attachment Cable calcs_R1R2.pdf

 

[MDJ]

Something like this, you mean? That you could also have found with a search on here to save me reposting it?

View attachment 22532

Clever Cloggs

 

[Geordie Spark]

Good God how did you work that out, have you got some kind of Cray computer brain

Robert Cray??

Robert Cray - Smoking Gun - YouTube

 

[Rockingit]

Clever Cloggs

In fairness, I think I might have only posted that one elsewhere

 

[Silly Sausage]

So why does linearity go to pot at 30m?
(For all combinations of csa)

 

[Rockingit]

So why does linearity go to pot at 30m?
(For all combinations of csa)

Because it's not a linear scale - the first 30m's are in 5m intervals, thereafter in 10's ('cos that's kinda how the real world works)

 

[telectrix]

nice graph. i use this. posted ages ago on this very forum.

useful information for form filling.

 

[Silly Sausage]

Hmmm...that's a change of scale at some point along the axis, arguably bad practice, misleading at best!
If you do change scale, there should be clear indication at the occurrence on the graph itself, not just the values on the axis.

 

[telectrix]

not too hard to spot by ther absense of 5's after 30m though, is it.

 

[Rockingit]

Hmmm...that's a change of scale at some point along the axis, arguably bad practice, misleading at best!
If you do change scale, there should be clear indication at the occurrence on the graph itself, not just the values on the axis.

Have you never looked at the time/current graphs in the BGB, then? They do exactly the same. There is a proper term for it but I can't currently remember what it is!

 

[telectrix]

is it exponential.

 

[Rockingit]

nice graph. i use this. posted ages ago on this very forum.

useful information for form filling.

That's a useful couple of pages, Tel. Cheers.

 

[Croney]

Have you never looked at the time/current graphs in the BGB, then? They do exactly the same. There is a proper term for it but I can't currently remember what it is!

It's a logarithmic scale.... allows them to fit much higher values without having a riduculously large graph.

 

[Silly Sausage]

Have you never looked at the time/current graphs in the BGB, then? They do exactly the same. There is a proper term for it but I can't currently remember what it is!

It's a logarithmic scale.... allows them to fit much higher values without having a riduculously large graph.

As Croney correctly points out, they are non linear scaled graphs.
On a linear scale, your BGB would probably have to be 2 or 3 miles long.
Re Your R v L graph: that x axis scaling would be shot down in flames in the real world!

 

[Geordie Spark]

As Croney correctly points out, they are non linear scaled graphs.
On a linear scale, your BGB would probably have to be 2 or 3 miles long.
Re Your R v L graph: that x axis scaling would be shot down in flames in the real world!

Just reading that makes you look almost like you're intelligent.

 

[Rockingit]

As Croney correctly points out, they are non linear scaled graphs.
On a linear scale, your BGB would probably have to be 2 or 3 miles long.
Re Your R v L graph: that x axis scaling would be shot down in flames in the real world!

This IS the real world...........[waits with fire extinguisher in hand].

Seriously though, I'm not sure quite why you think this is a big deal? It's just giving slightly better resolution at more common domestic lengths - 1 to 30m. I guess if I made it go 1,2,3,4,5,10,15,20,25,30,40,50,100,150 you'd just panic completely??

 

[Silly Sausage]

y = ax + c

c <>= 0


KISS :smilielol5:

 

[Hawkmoon]

Something like this, you mean? That you could also have found with a search on here to save me reposting it?

View attachment 22532

Nice - appreciated and printed

 

[grandfortune]

its the old "left me books in the van" line

always a pre-cursor to some sort of effort fail.

lol[/QUOTE

Yep definate effort fail, never lend your regs book to your mate for assesment, did have the OSG though but didnt think it was in there.



thanks for the info guys

Grand

 

[Rockingit]

y = ax + c

c <>= 0


KISS :smilielol5:

Well I'm glad we got that straight. Beer?

 

[DPG]

I was going to google it but I've left my computer in the van. And my van is at a mate's house. And my mate is on holiday. Daz