Daniel Schouten <d.schouten <at> quicknet.nl> writes:

> I am looking for an instrument to accurately measure a resistance of 100
> uOhms. This instrument will be used in a setup to trim large current
> shunts from 100uOhms -5% to 100 uOhms - 0.25%. Budget is < 2k USD. I have
> seen several options (Agilent, Keithley), but most are too expensive or too
> versatile (I only need to measure low Ohmic values).

Imho building a half bridge for this purpose using a 0.1% shunt as reference is
the best way. Normal milliohmmeters usually do not cater for four port shunts,
they need a special adapter for this. With a half bridge the measurement is done
with a double differential voltmeter (instrumentation amps followed by DVM for
readout). I have done something similar but for much lower precision (2%) in the
(distant) past for shunt production (tens to hundreds).

Peter P.

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