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Got a variable bench supply with a constant/regulated current mode?... If so connect your meter across the supply in constant current mode and slowly increase the current until you hit full scale, note current being supplied with a second meter if you can (to make sure full scale is accurate) and also measure voltage across the Simpson....if you have it's full scale current and voltage, and know ohms law you are 1 math problem away from having the meter resistance... It would probably be a lot more useful if your graphs were calibrated so you could read the actual current value over time....if you design the shunt to give you 250-300mA full scale (most sets that are not redplating never touch 250mA) you can get an accurate value off the chart.
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