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Cyclic Noise from B2902A SMU

Question asked by Pumpkin on Mar 2, 2018

Cyclic noise was found from B2902A SMU.   Connecting a Si SBD 1N5822 to B2902A SMU in 2-wire mode (connecting to the two force terminals) and observing the terminal voltage using TDS220 oscilloscope, I found cyclic noise of 70mVp-p in every 375ms.   What is the origin of this noise?   When I short-curcuited the input terminal of TDS220, no noise was found.   The cyclic noise was only found after waking up of B2902.   I attached a photo of TDS220.


I would like to know the origin of the noise and the setting for avoiding this phenomena.