Electron Charge-to-Mass Ratio
Install the e/m Tube on the Platform
5
012-14265A
Install the e/m Tube on the Platform
• The e/m tube has a number of pins in its base. The platform has a
socket on top that has holes that match the pins on the e/m tube.
The number and arrangement of pins and holes means that the e/
m tube can fit into the socket in only one way.
• Holding the e/m tube by its base, align the pins on the tube with
the holes in the socket and push the e/m tube into the socket.
Make sure that the tube is firmly in place.
• Note: The tube is a thin-walled, evacuated glass bulb. Handle with
care.
• Do not expose the tube to any mechanical stress or strain.
e/m Tube Specifications
Filling gas
helium
Pressure:
10
-1
pascals (Pa)
Filament Voltage
6.3 V AC
Accelerating Voltage
250 V DC
Deflecting Voltage
150 V DC
Pins
Base
Bulb
Note
: Replace the e/m tube with the same type: Model SE-9651 e/m Tube for SE-9629.
