As an alternative just get a high quality supply that can source 15
amps, measure the current with a few precision 1 ohm resistors in
parallel. Add a large LC filter in series if you think there's noise.
Measure across the shunt with kelvin connections. It's not an automated
device but nice rack-mount power supplies should be on ebay for
relatively good prices.
--
Martin K

Alan B. Pearce wrote:
>> I am looking for an instrument to accurately measure a resistance
>> of 100uOhms. 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).
>>     
>
> Quite frankly I would just get a keithley 2400 Sourcemeter or 2700 DVM, both 
> of which will do 4 lead Kelvin type measurements (which you are going to 
> need at that low resistance). The cost would be within your budget I think, 
> and although they have capabilities way beyond what you need, I think you 
> will find this will be the case for any ready built instrument capable of 
> doing what you want.
>
> Also they both have IEE-488 ports so you could arrange an automation system 
> to trim the DUT if desired.
>
>   

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