ADALM2000 - How to eliminate the Signal Generator DC offset ?

I have received ADALM2000 and tested it. Pin connections are as follows.

1+ —— W1

1- —— Gnd

I open the Scopy software and run the Oscilloscope without run the Signal Generator. The result is bellow.

A DC offset voltage about 160mV is acquired. I also use a multimeter to confirm the voltage between W1 and Gnd, the result is consistent.

When the Signal Generator and ch 1 is set to 0mV, the voltage acquired by the Oscilloscope is about 0.

I want to know whether this phenomenon is normal? How to eliminate the DC offset voltage when the Signal Generator is not run?

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