EEVblog 1521 - Common Mode Rejection Ratio (CMRR) Explained & Measured
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The EEVblog® NO SCRIPT, NO FEAR, ALL OPINION An off-the-cuff Video Blog about Electronics Engineering, for engineers, hobbyists, enthusiasts, hackers and Makers Hosted by Dave Jones from Sydney Australia DONATIONS: Store: https://eevblog.store/ PayPal: [email protected] Patreon: https://www.patreon.com/eevblog EEVblog2: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/channel/UCkGvUEt8iQLmq3aJIMjT2qQ EMAIL: Advertising/Commercial: [email protected] Fan mail: [email protected] Hate Mail: [email protected] I DO NOT PAID VIDEO SPONSORSHIPS, DON'T ASK! PLEASE: Do NOT ask for personal advice on something, post it in the EEVblog® forum. I read ALL email, but please don't be offended if I don't have time to reply, I get a LOT of email.
Video Description
What is Common Mode Rejection Ratio (CMRR) and how to measure it on a high voltage differential probe or differential amplifier. Using the new Rohde & Schwarz MXO4 oscilloscope. https://www.rohde-schwarz.com/us/products/test-and-measurement/oscilloscopes/rs-mxo-4-oscilloscope_63493-1164992.html Extended 30min version: https://www.youtube.com/watch?v=4gi2B3LrCww Differential Probe How It Works: https://www.youtube.com/watch?v=GOlgaEK2Hsk High Voltage Probe reverse engineering: https://www.youtube.com/watch?v=GOk1BYKSsOI&t=2s Oscilloscope Standard Deviation noise measurement: https://www.youtube.com/watch?v=G8Qoj3TpO9A Use coupon code ProbeyMcprobeFace for 15% of the HVP70 differential probe: https://www.eevblog.com/product/hvp70/ Forum: https://www.eevblog.com/forum/blog/eevblog-1521-how-to-measure-differential-probe-cmrr/ 00:00 - What is CMRR? 01:53 - Why twist the wires? 03:26 - Typical CMRR figures 04:51 - How to measure CMRR - The Setup 08:54 - Remote R&S Oscilloscope desktop view & settings 11:22 - Output to input voltage ratio 11:58 - Beware of DC offset 13:36 - Does the 20MHz CMRR measaurement match? 14:02 - Input referred measurement 15:02 - Compensating for the gain 16:29 - Automated Frequency Response Analysis Support the EEVblog on: Patreon: http://www.patreon.com/eevblog Web Site: http://www.eevblog.com Other channels: EEVblog2: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/eevdiscover T-Shirts: http://teespring.com/stores/eevblog #ElectronicsCreators #CMRR #Tutorial
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