Rice Lake Weigh Modules/Mount Assemblies - Manual (Page 79)

G-3
GLOSSARY
DORMANT SCALE
A built-in scale having a self-contained under
structure.
DOT MATRIX
A method of printing in which a rectangular
array (matrix) of spaces are filled in to form
alphanumeric and punctuation characters.
DRIBBLE
In filling operations, the weight value over
which material is slowly handled to provide a
more accurate cutoff.
DROPOUT
A temporary loss of electrical power normally
caused by utility and maintenance switching
functions where break-before-make switching
strategies are used.
E
e (Verification Scale Division)
Value of a verification scale division specified by
the manufacturer; sets value for tolerances and
accuracy class.
e
min
(Minimum Verification Scale
Divisions)
The minimum scale division or value for which
a device complies with applicable requirements,
e.g., bench or counter scale.
ECCENTRIC LOAD
Any load applied parallel to, but not concentric
with, the Primary Axis.
EEPROM (Electrically Erasable
Programmable Read Only Memory)
A data storage component whose data can be
repeatedly read out; the stored data can be
erased by an electrical signal and new data then
can be programmed into the component.
ELECTRICAL NOISE
Extraneous undesirable currents or voltages
which interfere with desirable electrical
quantities. Some causes are distant lightning,
radio transmitters, welding equipment,
electrical switching equipment, poor brush
contact on motors, and other electronic devices
utilizing switching power supplies.
ELECTRON
A negatively-charged subatomic particle that
orbits the nucleus of an atom. Electrical
current is the flow of electrons.
ELECTROSTATIC CHARGE
An electric charge on the surface of an
insulated object.
EMI (Electromagnetic Interference)
Interference caused by electrical fields due to
capacitive coupling, or magnetic fields due to
mutual inductance of electromagnetic fields
(radio waves).
ENVIRONMENTALLY PROTECTED
Refers to load cells which have a strain gauge
cavity filled with a potting compound. The
cavity opening is also generally protected with
loose-fitting side plates or molded plastic to
protect against physical damage. These cells are
protected from normal environmental factors
in indoor or outdoor applications. They should
not be submersed or washed down.
EPROM (Erasable Programmable
Read Only Memory)
A data storage component whose data can be
repeatedly read out; the stored data can be
erased by applying ultraviolet light, and new
data then can be programmed into the
component.
ERROR
The algebraic difference between the indicated
and true value of the load being measured.
ESD (Electrostatic Discharge)
A rapid discharge of an electrostatic potential
that can cause damage to integrated circuits.
EXCITATION
The voltage or current applied to the input
terminals of the load cell.
EXCITATION TRIM
Method of matching load cell outputs in a
multicell system by adjusting the excitation
voltage to each individual load cell. Adjustment
is made by changing the setting of a variable
resistor in series with the excitation input.
EXPLOSION PROOF ENCLOSURE
An enclosure that is capable of withstanding an
explosion of a specified gas or vapor which may
occur within it and of preventing the ignition of
the gas surrounding the enclosure. The
enclosure also must operate at such an external
temperature so that it is incapable of igniting
its surrounding atmosphere.
F
FACTORY MUTUAL (FM) SYSTEM
APPROVED
All products displaying this symbol have been
approved for use in hazardous (classified)
locations when following the proper installation
procedures and drawings, and utilizing
intrinsic safety barriers.
FLEXURES
Thin steel or plastic bands or plates which
replace the pivots and bearings of a conven-
tional scale, allowing less movement and
reducing friction.
FULCRUM
A pivot point for a lever.
FULL DUPLEX
Simultaneous, two-way, independent data
transmission in both directions.
G
GATED POWER SUPPLY
A power supply that allows conduction only
when signal magnitude is within specified
limits.
GRADUATION
A mark on an instrument or vessel indicating
degrees or quantity.
H
HALF DUPLEX
Data transmission in both directions, but not
simultaneously (see Full Duplex).
HANDBOOK 44 (H-44)
A comprehensive set of requirements for
weighing and measuring devices that are used
in commerce and law enforcement activities;
not a federal law, but developed and updated
annually by the National Conference on
Weights and Measures. Its complete title is
“Specifications, Tolerances, and Other
Technical Requirements for Weighing and
Measuring Devices.”
HANDSHAKING
Exchange of predetermined signals between
two devices for purpose of control.
HAZARDOUS (CLASSIFIED)
LOCATION
A location where fire or explosion hazards may
exist due to the presence of flammable gases or
vapors, flammable liquids, combustible dust or
easily-ignitable fibers or flyings.
HERMETICALLY SEALED
Refers to load cells which have a metallic
protective cover welded or soldered in place to
protect the strain gauge cavity. Some cells of
this type have additional protection at the cable
entry such as a glass-to-metal seal. These load
cells provide the best possible protection in
harsh chemical or washdown environments.
HIGH PASS FILTER
A filter passing frequency components above a
designated frequency and rejecting components
below that frequency.
HYSTERESIS
The maximum difference between load cell
output readings for the same applied load. One
reading is obtained by increasing the load from
zero and the other reading is obtained by
decreasing the load from rated load. Measure-
ments should be taken as rapidly as possible to
minimize creep.