3 ms·
You can literally buy a Fluke meter good down to 4ma with 0.2% accuracy: https://a.co/d/d8MZFKC https://a.co/d/d8MZFKC
by vorpalhex 4y ago
You can literally buy a Fluke meter good down to 4ma with 0.2% accuracy: https://a.co/d/d8MZFKC https://a.co/d/d8MZFKC
- nomel 4y ago10mA is enough to lose control of your muscles. 4mA is incredibly insensitive [1] compared to a more direct measurement, with volts from electrons, rather than trying to measure their weak magnetic field, at a distance, as they zip by. With a sense resistor, you can use a bench top voltmeter [2] to measure nA. 1. 10fA resolution, over 400 billion times more sensitive: https://smt.at/en/products/electrometer-nv-meter/picoamperemeter-von-keithley-instruments-2/ https://smt.at/en/products/electrometer-nv-meter/picoamperem... 2. > 1 million times more sensitive, with GΩ sense resistor: https://www.keysight.com/us/en/assets/7018-06774/data-sheets/5968-0162.pdf https://www.keysight.com/us/en/assets/7018-06774/data-sheets...
- heisenzombie 4y agoThe currents would be much less than 4mA. I’ll try to estimate the most current we could expect. Some googling throws up that a human body has ~30pF of capacitance, and that static electricity can be up to 20kV in very dry conditions. That’s 600 nanocoulombs of charge. If we guess that you’re building that up once once every minute (what a terrible existence, getting a big shock 60 times an hour!), then the grounding strap would be carrying ~10nA continuously.