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The problem is seen in both sweep mode, and in manual (static) voltage mode.
Applying voltages roughly in the range of -0.5V to +0.5V, the V-I trace of the cell showed an anomalous feature, so I scoped the signal with a high impedance probe, and can see a high frequency oscillation occurring.
The oscillation is a few tenths of a volt peak to peak, it's fairly sinusoidal, it changes frequency from about 10KHz to about 100KHz when I block the light path somewhat (imperfectly).
The oscillation is not seen when I disconnect the 2400, things look as expected.
The oscillation is not seen when I connect a simple resistive load across the 2400.
Hence, I'm guessing the output stage of the 2400 might be interacting with the reactive load (the solar cell must have significant capacitance), and somehow causing a resonance.
Any assistance is greatly appreciated!
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