LCR-T4 electronics components tester ATMega328 - Test and Review

Transistor 13003 is seen once as NPN and after inversion as PNP?

Hello.
I'm just learning the basics of electronics and reading phrases like this:
(...) calibration, we do it by connecting pins 1-2-3 with minimal resistance (e.g. with two silver jumpers or redundant resistor ends). (...) with an experienced forum member, I'm starting to get confused.
(link)
What's with that resistance? To make it minimal, according to the author, you need to use silver jumpers (that is, in my opinion, relatively thin wires 0.5-1.5mm) or resistor tips (they are also very thin). According to the pattern R = (ro * l) /s the resistance is inversely proportional to the cross-section (ie thickness), i.e. the thinner the wire, the higher the resistance.
So should I use a thin or thick jumper, because I don't know anymore....
greetings

alek_troda wrote:

So should I use a thin or thick jumper, because I don't know anymore....

whatever. With such short lengths of conductor needed, it doesn't matter at all.

398216 Usunięty wrote:

whatever. With such short lengths of conductor needed, it doesn't matter at all.

I understand, but I will continue to dig in anyway: are the following statements true in this regard:
a) at small distances of the order of

alek_troda wrote:

and)

You can always count. You have the right data in the network - the specific resistance of copper, and even the resistance per meter of copper wire. You plug in the data and calculate. Easy?

alek_troda wrote:

b)

As above. Typical thickness of copper on a PCB is 35 microns (sometimes 70 microns for high current circuits) trace width - depends on necessity from say 1/10mm to 5mm or more (in case of mass).
It's nice that you are interested in such things, but it's a pity that you are not interested in looking for ready-made answers yourself. It's called "self-initiative" - I recommend it.

Thanks Deleted for this data!
greetings