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I was the first to publish my review of the Keithley 2450 SMU in July this year, however, the review itself was couched in a major caveat. This was the fact that the instrument was not performing correctly under certain circumstances and appeared to have some quirks which were still being investigated.   I have maintained contact (where possible) with Tektronix representatives since my first contact on 22nd May, providing further information where possible and also examining some of their ...