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Can't apply voltages from -1200mV to 0mV in cyclic voltammetry

Category: Software
Product Number: ADuCM355

I am using the CYCLIC VOLTAMMETRY EXAMPLE on the EVAL-ADUCM355QSPZ.
And I connected four 1kΩ resistors to the P5 header.

I want to apply -1200mV to 0mV to the dummy sensor, but I can't.
How can I solve that?

Original AD5940Main.c
pRampCfg->RampStartVolt = -500.0f; /* -500 mV */
pRampCfg->RampPeakVolt = +500.0f; /* +500mV */
pRampCfg->VzeroStart = 1300.0f; /* 1.3V */
pRampCfg->VzeroPeak = 1300.0f; /* 1.3V */

Changed
pRampCfg->RampStartVolt = -1200.0f; /* -1200 mV */
pRampCfg->RampPeakVolt = 0.0f; /* 0mV */
pRampCfg->VzeroStart = 2000.0f; /* 2.0V */
pRampCfg->VzeroPeak = 2000.0f; /* 2.0V */

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