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B1500a Capacitance-voltage measurement

Question asked by tracy on Jan 14, 2014
I used Solar Cell Cp-AC Level application test in B1500A to acquire the C-V curve of a solar cell.
The voltage range is set from -2V to 2V for the measurement. 
However, it is found that the data in the capacitance column from -2V to -1.5V are blank in the result excel file. 
I have tried different measurement frequencies such as 1kHz or 1MHz, but the capacitance data column are also blanked from -2V to -1.5V.
Would you please give me some advice? Thank you in advance!