Electron Charge-to-Mass Ratio
Electrical Symbols
3
012-14265A
• Use caution when working with voltages above 30 V AC rms, 42 V peak, or 60 V DC. Such
voltages pose a shock hazard.
• To avoid electric shock, do not touch any bare conductor with hand or skin.
• Adhere to local and national safety codes. Individual protective equipment must be used to
prevent shock and arc blast injury where hazardous live conductors are exposed.
• Special note: If a dangerous voltage is applied to an input terminal, then the same voltage may
occur at all other terminals.
Electrical Symbols
Introduction
The e/m apparatus (Electron Charge-to-Mass Ratio) provides a simple method for measuring e/m, the charge to mass ratio of
the electron. The method is similar to that used by J.J. Thomson in 1897. A beam of electrons is accelerated through a known
potential, so the velocity of the electrons is known. A pair of Helmholtz coils produces a uniform and measurable magnetic
field at right angles to the electron beam. This magnetic field deflects the electron beam in a circular path.
Alternating Current
Direct Current
Caution, risk of danger, refer to the operating manual
before use.
Caution, possibility of electric shock
Earth (ground) Terminal
Protective Conductor Terminal
Chassis Ground
Conforms to European Union directives.
WEEE, waste electric and electronic equipment
Fuse
On (Power)
Off (Power)
In position of a bi-stable push control
Out position of a bi-stable push control
