Changjiang Liu

Hi, tech support. Our research lab is using the delta mode of 2182A together with a SMU for measuring sample resistance. However, we are experiencing a issue with one of the 2182A. The two 2182A have a firmware of C02 and C08, respectively. Both of these 2182A can pair with a SMU for delta mode measurement when the front auto zero is enabled. However, the newer 2182A with firmware C08 (also tried downgrading to C06), shows a problem when the front auto zero is disabled. Specifically, we found that this 2182A only calculates V1/2 instead of (V1-V2)/2 when front auto zero is off.  The other 2182A does not have any problem regardless of front auto zero on or off. Could you please help resolve this issue? Thank you!