INFICON PLO-10i Phase Lock Oscillator User Manual
Page 70
PLO-10 PHASE LOCK OSCILLATOR
GLOSSARY
9-2
O.D.
Abbreviation for Outside Diameter. Usually use in specifying a tube size in the form
inch
I.D. x inch O.D., where inch are the dimensions.
Organic
In chemistry, organic refers to a species containing carbon. Certain small ions and
compounds containing carbon (such as carbon dioxide) are usually not considered to
be organic, but rather are classed as inorganic.
Picofarad 10
-12
farads. A common unit of capacitance (abbreviated as pfd). By definition, 1
farad will store a 1 Coulomb charge when connected across a 1 volt potential.
Plasma Cleaning
A method that utilizes plasma reaction at the surface of the sample and volatile by-
products are removed by the vacuum pump. The basic instrumentation required this
process includes a reaction chamber, a power supply, and a vacuum source. The
sample being cleaned is put into the chamber which is evacuated by the vacuum pump.
Gas (oxygen) is introduced into the chamber and converted to reactive plasma by the
power supply. For more information visit
PLO
Phase Lock Oscillator. A type of electronic circuit in which the frequency and the
phase of the Voltage Controlled Oscillator (VCO) is locked to the frequency and the
phase of a reference signal (in our case the signal from the sensing crystal).
Quadrature (current)
Refers to the imaginary component of the current through the shunt capacitance, C
S
.
Redox
An oxidation-reduction reaction; the term "redox" is obtained from the first few letters
of "reduction" and "oxidation."
RTD
Resistance Temperature Detector. A device that changes its resistance as a function of
temperature.
Shunt Capacitance
Effective capacitance due to the electrodes on the crystal. This is the "unwanted"
capacitance we try to cancel out (along with the capacitance in the cable and the holder
of course) while adjusting the Fine & Coarse capacitance cancellation on the PLO-
10.CM.
Silanization
The chemical conversion of hydroxyl (OH) groups, which often act as adsorption sites
on silica or glass stationary chromatographic phases, with silane coupling agents to
give the inactive -O-SiR3 grouping. Silanization can neutralize surface charges, thus
eliminating non-specific binding.
Teflon®
DuPont Company’s registered trademark of Perfluoroalkoxy Fluorocarbon Resin, a
class of Teflon that offers excellent inertness to aqueous acid and aqueous alkaline,
superior resistance over a wide range of pH. Visit
ore
information.
Ultrasonic cleaning
This method utilizes high frequency (ultrasonic) and high intensity sound waves into a
liquid producing cavitations (rapid formation and collapse of minute cavities in a
cleaning liquid. For more information, visit
UVO cleaning
Ultra-Violet/Ozone. The UVO cleaning method is a photo-sensitized oxidation
process in which the contaminant molecules are excited and/or dissociated by the
absorption of short-wavelength UV radiation. Near atomically clean surfaces can be
achieved using this method. The basic instrumentation required this process includes a
UVO chamber, a gas (oxygen) supply, or an exhaust system. For more information,
visit