Designing a 1kV Isolated Oscilloscope - EEVblog
Active RF 600MHz Probe (high imp -> 50Ω), Schematic Included - Mr Carlson's Lab
Fluke 732A DC Voltage Standard & LTZ1000-based DIY attempt - Marco Reps
Making and ultralow Noise 0.1-10Hz Tester: capacitor wizardry, thermal fluctuations and zero-drift op-amps. Testing 9V Battery vs. 7805 vs. LTZ1000 - Marco Reps
EEVblog #1017 - Enter The World Of Atto Amps - EEVblog
What's All This Femtoampere Stuff, Anyhow? - Bob Pease
Femtoamp Measurement on your Desktop - rcommins2
Open Source 8.5 Digit Voltmeter from CERN: Build and Test - Marco Reps
Measuring low voltages with old Keithleys - Marco Reps
How an Atomic Clock Really Works, Round 1: Inside the HP 5061A Cesium Clock - CuriousMarc
How an Atomic Clock Really Works, Round 2: Zeeman Alignment - CuriousMarc