Dave repairs several faults in a 500MHz HP54161B 2GS/s oscilloscope. One in particular is quite elusive, can you figure it out before Dave does? BONUS: Sneak peak at a new Siglent SDS1000X-E Series scope! Forum: http://www.eevblog.com/forum/blog/eevblog-982-hp54616b-500mhz-oscilloscope-repair/ EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 T-Shirts: http://teespring.com/stores/eevblog

Fundamentals Friday All about opamp input bias currents. Dave goes through the theory, and then does some practical measurements and tweaking. All EEVblog Opamp related videos are here: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf Offset measurement video: http://www.youtube.com/watch?v=YeNpd-sXaHk Chopper Amp Video: http://www.youtube.com/watch?v=oibJUt6QkwI Forum: http://www.eevblog.com/forum/blog/eev... EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/

In this tutorial Dave explains how to precisely measure and calculate the remaining (or wasted) energy capacity in a battery using the graphical analysis technique using a spreadsheet. The differences between constant power and constant current loads and when to use them is discussed. Also, the importance of ESR and measuring the battery voltage under load is demonstrated. This is a particularly relevant to the Batteriser product and proof is provided that shows that even over the entire current range, the wasted energy in a battery can be no better than a few 10's of percent for a 1.1V cutout voltage. Blowing the batteriser claim of 80% wasted energy out of the water. Forum: http://www.eevblog.com/forum/blog/eevblog-772-how-to-calculate-wasted-battery-capacity/ All of my battery related videos are here: https://www.youtube.com/playlist?list=PLvOlSehNtuHtj5Ubhx7govoBfNkyUO4Pp DIY Constant current load: https://www.youtube.com/watch?v=8xX2SVcItOA Battery Capacity Tutorial: https://www.youtube.com/watch?v=R8hTQXqURB4 AA Battery Capacity Measurement: https://www.youtube.com/watch?v=uT4hKd66UY4 Batteriser Debunking Video: https://www.youtube.com/watch?v=4iEshd6izgk LiPo Battery Discharging: https://www.youtube.com/watch?v=ln8Mlz4NsW8 EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 T-Shirts: http://teespring.com/stores/eevblog Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/

Coming soon... Follow Richard on Twitter: @nascom1 EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 T-Shirts: http://teespring.com/stores/eevblog