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test Multimeter with Battery

Question asked by sam22 on Sep 6, 2015
Hi ,
We test Mulimeter ( 34461A model ) with Battery , when Input Impedance = high , Auto zero =on , Range =100 mV .
The result of this test is shown in a picture as below . 
As we see in a pic after 14 minutes curve does not be fixed and can not be stable . Why?