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INA111: INA111 Offset

Part Number: INA111


i want to juse the INA111 with Gain of 1, 10, 100 and 1000. The Datasheet says that the Offset RTI is 100uV + 500uV/G.

I mean with Gain z.b. 1000 the Offest may be 100 + 500/1000 similar 100.5 uV. In my case I measure  with both Inputs shorten to ground

Gain 1  0,3mV

Gain 10 1,9mV

Gain 100 19mV

Gain 1000 190 mV

Is this correct ? Or what is wrong