nothing, it reads as though your existing CC device can support several thousand volts of output compliance while maintaining 1 uA. This suggests a load on the order of GigOhms is required to demonstrate that behavior. (Difficult to set up and keep clean. But doable, I guess.) Is that right? And, now you want to have something that can support constant currents of up to 1 mA while still supporting the same compliance voltage range? (Order of MegOhms as a load?)
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