Safety information
WARNING: To avoid possible electric shock or
personal injury, follow these guidelines.
• Clean the equipment only with a soft, dry cloth.
• Before use, verify that the apparatus is not damaged. Do
not use the apparatus if it is damaged.
- Always inspect the case for signs of damage before
using the equipment. Pay particular attention to the
insulation surrounding the connectors.
• Do not disconnect the power cord safety ground feature.
• When plugging in the apparatus, always plug it into a
grounded (earthed) outlet.
• Do not use the product in any manner that is not specified
by the manufacturer.
• Do not install substitute parts or perform any unauthorized
modification to this product.
• Line and Current Protection Fuses: To ensure protection
against fire, replace the line fuse and the current-protection
fuse only with fuses of the specified type and rating.
• Main Power and Test Input Disconnect: Unplug instrument
from wall outlet, remove power cord, and remove all probes
from all terminals before servicing. Only qualified, service-
trained personnel should remove the cover from the
instrument.
• Immediately stop using the equipment if it operates
abnormally, as protection may be impaired. When in doubt,
have the equipment serviced.
• Do not operate the equipment under wet conditions, or
under conditions where explosive gas, vapor, or dust are
present.
• Do not apply more than the rated voltage (as marked on
the apparatus) between terminals, or between any terminal
and ground.
• When servicing the equipment, only use specified
replacement parts.
• 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 hands or skin.
• Adhere to all local and national safety codes. Individual
protective equipment must be used to prevent shock and
arc blast injury where hazardous live conductors are
exposed.
• Keep in mind: If a dangerous voltage is applied to an input
terminal, then the same voltage may occur at all other
terminals.
Assembly
Assemble the base
1. Use the screws from the mounting hardware to fasten the
two Helmholtz coils on the platform so that the terminals on
the coils face toward the outside.
2. Fasten the three support rods from the mounting hardware
between the two Helmholtz coils.
3. Mount the mirrored scale on one of the Helmholtz coils so
that the mirror reflects toward the e/m tube coil. Tighten the
screws on the ends of the mirrored scale to hold it in place
on the coil.
4. Holding the e/m tube by its base, align the tab on the tube
with the notch in the socket. Turn the tube in the socket
until the tab slips into the notch, then push the tube into the
socket. Make sure that the tube is firmly in place.
WARNING: Avoid touching the glass bulb of the
tube. Touch only the plastic part below the glass
bulb. Do not expose the tube to any mechanical
stress or strain. Handle with care.
Figure 1. The fully assembled base.
Electron Charge-to-Mass Ratio | SE-9629
2
