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Speaker:
Dave
Bechtol
HDR
Architecture, Inc.
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The effects on sensitive electronic
equipment form external and internal sources of power disturbances
can be mitigated by the application of various types of power
conditioning equipment and/or by varying the configuration of
the power distribution system in a way to provide clean power
to the sensitive equipment.
Transient voltage surge suppression
devices, isolation transformers, uninterruptible power supplies,
generator and other types of power conditioners can be used
to protect lab equipment from one or more different types
of power disturbances.
Varying the configuration of the power
distribution system can in itself improve power quality at
the lab. By applying power conditions at selected locations
within the distribution system, the quality of power can be
greatly enhanced.
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Speaker:
Mark
Stephens
EPRI
PEAC Corporation
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The most common type of electrical
disturbance that is detrimental to high tech manufacturing is
the voltage sag. This presentation will discuss the use of new
battery-less technologies to enable NANO building facility and
process systems to be more robust to voltage sags. The presentation
will discuss the electrical environment in the United States,
the common reasons why process and facility equipment is vulnerable
to voltage sags, and what can be done to make more robust systems.
The relevance of the semiconductor industry power quality immunity
standard SEMI F47-0200 will be discussed as well. Special emphasis
will be given to designing systems that have “built-in”
immunity to voltage sags such that the use of expensive large
scale power conditioning can be minimized.
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(3.4 MB) |
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Speaker:
Bob
Erdman
Erdman Measurement Consulting
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Why the "3rd pin" of the
power plug is GROUND, not a reference.
Filters and capacitance dump ac currents into this line.
Some equipment has ac power line current in this line.
Therefore the voltage with respect to the earth is different
at different points.
It can be volts away from the experiment ground
In general it is not quiet, thus transmits noise into a grounded
experiment.
› Impact of this on the measurement and instrumentation:
Discussion of CMRR, related to NMRR from my Wednesday talk.
Calculation of CMRR errors, typical numbers
Quick review of coupling mechanisms from Wednesday:
If the shield is tied to a noisy ground, it becomes an unwanted
transmitter
A Reference Bus solves these problems.
How to handle it: rules for connecting
Tie to earth
Tie to building ground at point of earth connection
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(392 KB) |
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Speaker:
Ralph
Morrison
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A very short history of grounding.
Why it is necessary in a facility. The difficulty in using circuit
theory to explain facilities, power grids, lightning and other
electrical activity. The semantics difficulty. The
politics of grounding. Why are there so many divergent views?
What is
interference and how does it propagate and couple? What are
the
explanations of how interference enters equipment and modifies
signal
patterns? What can be done in a facility to make it easier for
end users
to effectively operate their hardware? When does the problem
become the
domain of the hardware designer? What are the solutions that
help and what
are the solutions that cost money and do very little.
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(3.5 MB) |
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