The Tektronix 3 Series MDO and Keysight DSO/MSO 3000T X-Series use different techniques for making automated measurements. The Tektronix 3 Series MDO calculates measurements and performs waveform math on its entire acquisition memory. So, measurements don’t change based on zoom settings. Measurements on the Keysight DSO/MSO 3000T can vary depending on zoom settings, as shown in this video.
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