Electron microscopy
Faraday Cage for Probe Current Measurement in EMs
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


The electron probe or beam current can be directly and simply measured with a Faraday cage. For instance, in some TEM cases, the Faraday cages are mounted on a removable specimen rod. The current measurement can be done as follows:
         i) Calibrate the zero current with a Faraday cage as shown in Figure 3115 (a).
         ii) As shown in Figure 3115 (b), rotate the Faraday cage and record the beam current by reading a current meter.

Faraday cage used to measurement electron beam current: (a) Calibration of zero current. (b) Beam current measurement.

Figure 3115. Faraday cage used to measure electron beam currents: (a) Calibration of zero current. (b) Beam current measurement.



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