John Smith

Hello. We got resistance below zero during short time(~10sec) when measured one of samples and after 10-20sec we got resistance more zero and equal to ~80GOm;.Could you please explain reason of resistance below zero?<br> <br> Sample: sintered Al2O3 (density &gt;99,99%), thickness=500µm;<br> Device: Keithley 6517b;<br> Settings:&#160;<br> Speed = HiAccurancy;<br> Ampsrel = Disable;<br> Damp = Enable;<br> Vsource = Manual;<br> Meas-type = Resistance;<br> Amperage = 20mA;<br> Voltage = 500V;<br> Filter = Averaging(25RDGS);<br> +<br> with store like Resistance&#160;by Time;<br> (and could you please dont lock my account because I cant connect/call to your support)