Section I Introduction
Danger: Trek high-voltage generating equipment, including Trek amplifiers and
supplies are not designed, rated, or qualified to be operated in an environment or
atmosphere which contains combustible or explosive materials or gases which may
be ignited by electrical discharges.
This manual provides instructions to install and operate the Trek Model 156A
Charged-Plate Monitor. We recommend you take the time to read this manual to
take full advantage of the features and benefits of the instrument.
General Information
The Trek Model 156A Charged-Plate Monitor System is designed to provide
quantitative and accurate measurements for a variety of air ionization tests in any
location. The OUTPUT MONITOR connector on the rear panel is a buffered output
providing a low-voltage replica of the voltage on the ion collecting plate.
The Model 156A employs a revolutionary new charged-plate monitor design that
utilizes an ultra-high-impedance high-voltage follower to monitor the ion collecting
plate voltage. This technique provides very high accuracy and virtually infinite
impedance loading of the plate, while allowing the ion collecting plate to be charged
and monitored through the same small-diameter connection.
This technique also makes the measurement capacitance independent of the physical
size and shape of the ion collecting plate. Therefore, the size and shape of an ion
collecting plate, as well as the measurement capacitance, may be customer specified
to match a particular ESD-sensitive device within a manufacturing process, or it may
be made to conform to the ESD Association Standard ANSI/ESD-STM3.1.
I - 1
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