INFICON TM-400 Thin Film Deposition Monitor - Manual (Page 35)

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TM-350/400 Operating Manual
Chapter 4
Monitor Installation
4.1 Monitor Installation Precautions
4.1.1 Proper Grounding
The Monitor was designed to operate in electrically noisy environments. In many
cases no special grounding precautions will be required. Where noise susceptibility
is suspected, use a short length of wire, wire braid or copper strap is
recommended, to connect the Monitor to the equipment on which, or in which, the
instrument is mounted. Use the grounding lug provided on the back of the Monitor
for this purpose. If trouble still persists, make sure that the equipment on which the
Monitor is mounted, or the equipment rack in which the instrument is mounted is
adequately grounded to the vacuum frame. Use short copper straps or braid. It is
a good idea to use several grounding straps attached to widely separated points
on the vacuum system and equipment frame in order to minimize the inductance
of the ground path. See
Figure 4-3 on page 4-10 for recommended grounding
method.
4.1.2 Heat Dissipation
Your Monitor dissipates very little heat. Nonetheless, the heat that is generated
must be allowed to dissipate or the Monitor will overheat. Most of the heat
generated in the Monitor is routed to the rear panel that is cooled by convection and
radiation. Make sure that there is adequate clearance around the instrument to
allow airflow. If the instrument is mounted in an enclosure, make sure that the
airflow is enough to maintain a maximum temperature environment of 50 degrees
centigrade for the Monitor. Overheating of the Monitor will ultimately cause
functional failures and may cause permanent failures.
4.2 Rear Panel Connections
4.2.1 Oscillator Connector(s)
A BNC connector is provided on the rear panel of the TM-350, and 2 BNC
connectors on the TM-400, for connection to the sensor oscillator. The Monitor's
oscillator input buffer is designed to operate with coaxial cable of 50. impedance.
Cable lengths up to 100 feet may be installed using RG-58 cable or an equivalent.
Cable lengths longer than the 10-ft. length supplied are available upon request.
See
Chapter 5 for installation instructions.