Interesting that the Keithley 148 has an input noise of 0.2nV RMS and had its heyday in the 1970s. The147 is not as good but good enough to have a 30nV lowest range. I have reliably measured 5nV with my 147. Most of a day is required to warm up the instrument and let the DUT, connections and cables stabilize.
Setting the DUT on top of the instrument shows some coupling of the 147 transformer and the DUT/cables. Had to move the DUT away from the instrument. I used a Keithley 2450 to force 1A into a 5 nano ohms precision 4-wire short manufactured by Ohm Labs. Brian VintageNut on eevblog On Sat, Aug 29, 2015 at 3:54 PM, Attila Kinali <[email protected]> wrote: > On Sat, 29 Aug 2015 20:17:55 +0200 > Andreas Jahn <[email protected]> wrote: > > > the LSK389 is usually used for very low noise applications. > > (the title already states this: 40nVpp). > > > > What 1/f noise has the LTC6241? > > Ah! Now it makes sense! The LTC6241 has an input noise voltage > of typ 550nV p-p (0.1Hz to 10Hz). > > Thanks! > > Attila Kinali > > -- > I must not become metastable. > Metastability is the mind-killer. > Metastability is the little-death that brings total obliteration. > I will face my metastability. > I will permit it to pass over me and through me. > And when it has gone past I will turn the inner eye to see its path. > Where the metastability has gone there will be nothing. Only I will remain. > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
