If you need accurate measurements, I do have an Andeen-Hagerling 2500E which can measure C @1kHz to better than 5ppm and 8 digits resolution even at 10pF.? I rarely get it calibrated but its still the best on the market.
If you decide on what you're going to use as a standard, I'd be glad to measure it for you if you send your standard to me.
Richard
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A General Radio 1422D dual range variable would meet the specification. Needs the calbration chart though. The earlier 722D would be OK if calibrated and used at same temperature.
Not many units neet this specification. A pair of IET SCAs would do but they are not cheap. chaeapest would be to make up something as close as can with PC caps and get it measured. That's the difficult part. Most labs can't measure 100pF to 0.01%.
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Robert.
