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IVC102: Unknown signal

Part Number: IVC102

Hello, I'm using the IC IVC102U to detect the phenomenon of fluorescence. I am using the following parameters:

delay_reset = 25 ms;
delay_hold = 15 ms;
integration_time= 150 ms;

My question is: I perform the sequence HOLD, RESET, INTEGRATION and HOLD again. However, when I perform HOLD, a jump occurs in the output signal (marked in red in the figure).

I do not understand what's wrong with the S1 and S2 control.

Can someone help me?