[time-nuts] Precision voltage to current conversion
Mark Sims
holrum at hotmail.com
Mon Jan 26 21:35:55 UTC 2009
I recently picked up a Fluke 515A meter calibrator. It puts out 0-10V AC/DC (and 100V fixed) suitable for 4.5 - 5.5 digit meters. The DC voltage source impedance is around 300 ohms. I would like to build a (reasonably simple) converter to allow current ranges to be calibrated to around the same level of accuracy. A simple single op-amp floating load converter might do for low currents (I have some 0.001% 1K resistors that would make a nice 1ma/V converter).
Can anybody recommend any other circuits? Also circuits for higher load currents?
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