Hi,
Measuring the resistance of two wires poked into two connecting holes of a solderless breadboard i can easily measure 10 ohms or even higher. I tried it with clean #24 gauge wires and also the common jumper leads that come in a pack of 20 to 40, made for breadboard projects. The wires themselves, which are so short (less than 6 inches each), measure zero ohms.
This resistance may not be a problem for high input impedance logic, but for analog measurements it really wrecks havoc. 10 ohms with 1ma equals 10mv, which is a large error when using high resolution AD converters. Not only that, but jarring the wires just a little means a different resistance. I measured from 0.5 ohms up to 60 ohms depending on how the wires sit in the hole. The most typical is around 10 ohms though, but it always changes when the board or wires are jarred even just a little.
The measurement is easy: just plug two wires or jumpers into the breadboard and measure the resistance between them with an Ohm Meter. It is very surprising how high the resistance can be. This means if you are working on a project you could see some very strange results using solderless breadboards, and not necessarily at high frequency (where they are known to have problems) but even at DC.
Try the simple measurement and see what you get.
Measuring the resistance of two wires poked into two connecting holes of a solderless breadboard i can easily measure 10 ohms or even higher. I tried it with clean #24 gauge wires and also the common jumper leads that come in a pack of 20 to 40, made for breadboard projects. The wires themselves, which are so short (less than 6 inches each), measure zero ohms.
This resistance may not be a problem for high input impedance logic, but for analog measurements it really wrecks havoc. 10 ohms with 1ma equals 10mv, which is a large error when using high resolution AD converters. Not only that, but jarring the wires just a little means a different resistance. I measured from 0.5 ohms up to 60 ohms depending on how the wires sit in the hole. The most typical is around 10 ohms though, but it always changes when the board or wires are jarred even just a little.
The measurement is easy: just plug two wires or jumpers into the breadboard and measure the resistance between them with an Ohm Meter. It is very surprising how high the resistance can be. This means if you are working on a project you could see some very strange results using solderless breadboards, and not necessarily at high frequency (where they are known to have problems) but even at DC.
Try the simple measurement and see what you get.