- #1
swooshfactory
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Is it possible to measure the direction of a current at current magnitudes this small? Or only its magnitude?
Measure direction of subpicoamp current
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Discussion Overview
The discussion centers on the feasibility of measuring the direction of subpicoamp currents, exploring both the methods available and the limitations involved in such measurements. It encompasses practical applications and considerations related to instrumentation and noise factors.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- One participant questions whether it is possible to measure the direction of currents at subpicoamp levels or if only the magnitude can be determined.
- Another participant asserts that it is indeed possible to measure the direction of currents in the femtoampere range, suggesting that methods exist for such measurements.
- A different participant mentions the availability of commercial instruments capable of measuring currents well below a picoamp, comparing the process to using a multimeter.
- This participant also notes that the effectiveness of measuring small currents depends on the impedance used, indicating that translating current into voltage via a large impedance can facilitate measurements, although limitations such as Johnson noise must be considered.
- Additional practical resources and devices are provided by another participant to support the discussion.
Areas of Agreement / Disagreement
Participants express differing views on the methods and feasibility of measuring the direction of subpicoamp currents, indicating that multiple competing perspectives remain without a consensus.
Contextual Notes
Participants highlight limitations related to impedance and noise, particularly Johnson noise, which may affect the measurement of very small currents.