How do micro ohmmeters work?
Same principle as normal ohm meter. A few necessary differences/enhancements are kelvinated measurement wires, sensitive and high precision input amplifier and high accuracy/resolution indicator/ADC. Some expensive models (notably ones with DSPs) have averaging/repeated measurements with noise cancellation algorithm.Originally posted by thingmaker3@Mar 26 2006, 02:10 AM
How do micro ohmmeters work?
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When circuit boards had only through hole components, wire jumpers were used to make optional connections. A piece of wire is difficult for a pick 'n place machine to handle so the 0 ohm resistor replaces the piece of wire used as a jumper.Originally posted by Polgi-Wan@Mar 28 2006, 04:07 AM
never seen (or used) one ever.... which applications / circuits are these commonly used?
which brings me to think why do we have 0 ohm resistors?
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You could use one to measure specific conductor resistivity and because most of these micro ohmmeters also measure voltages down to nV range, they are also invaluable in high precision lab works and semiconductor characterisations. These are the ones that I know and I have no doubt that they are also useful in many other applications.Originally posted by Polgi-Wan@Mar 28 2006, 09:07 AM
never seen (or used) one ever.... which applications / circuits are these commonly used?
which brings me to think why do we have 0 ohm resistors?
[post=15512]Quoted post[/post]