| A |
Accuracy
The degree of agreement between the displayed and true value of
the quantity measured. Accuracy of a scale's results must be looked
at based on the accuracy of the whole system and not just one
component. This includes the environment in which the scale is
used, what is being weighed, the operator's use of the scale and
how the scale is maintained. The accuracy of the scale should be
appropriate for the application and the cost of the item being
weighed. |
Accurate
A piece of equipment is accurate when its performance or value
conforms to the standard within the applicable tolerances and other
performance requirements |
Alibi Memory
A dedicated memory module which records a series of weighments and
additional information for the purposes of traceability. |
Alpha Numeric
Denoting a set of characters which contains both letters and
numbers. |
Ambient Temperature
The temperature of the medium surrounding the load cell. |
Analog Input or Remote Input
An additional input on a scale that allows a remote base to be
attached to the scale for two-platform counting. This allows the
counting scale to provide the precision of a smaller scale while
the remote base provides a higher capacity than the counting scale.
The actual counting resolution will be bounded by the capabilities
of the counting scale. Applications include annual inventories or
packaging where a counting scale is connected to a floor scale
base, with the counting scale determining the Average Piece Weight
of the parts and the floor scale base providing a higher capacity
for counting large boxes of parts. |
Analytical Balance
An electronic balance characterized by a precision/capacity ratio
of 1/500,000 or better and a readability of 0.1 mg or better, often
with a draftshield to minimize disturbances to the weighing
platform. |
Approval Seal
A label, tag, stamped or etched impression, or the like,
indicating official approval of a device. |
Auto Add
Software included in advanced counting scales which ensures a
specific sample weight accuracy for parts counting based on the
minimum Average Piece Weight of the scale. If the sample weight is
too light, it prompts the operator to add a set number of
additional parts until the desired level of sample weight accuracy
is met. |
AutoCal
A type of span calibration for scales with a single internal
calibration mass, where the scale initiates a calibration
automatically based on a change in temperature. |
Automatic Tare
A tare function where the scale automatically records the tare
weight based on the first item placed on the scale. May be set for
a set period of time for the tare weight to be accepted. |
Auto Off
A software routine that turns off a scale after a set period of
inactivity which may be set through menu options on a scale. |
Auto Optimization
Software included in advanced counting scales which minimizes hand
counting errors of the sample. Instead of hand counting a large
number of pieces for a sample, the operator can place a smaller
sample on the scale, and then add successive groups (of less parts
than the total number of parts on the scale for the sample) to
achieve a higher level of Average Piece Weight accuracy. Auto
Optimization will continue as long as the number of new pieces
added is equal to or less than the number of pieces already on the
scale. If more pieces than the number on the scale are added, the
scale will stop Auto Optimizing and set the Average Piece Weight to
the last recorded Average Piece Weight. By using Auto Optimization,
an operator can use a very large sample without having to hand
count the entire sample at once (for example, 10 batches of 10
pieces each instead of 100 pieces at one time), reducing
errors. |
Auto Zero Tracking (AZT)
A feature in most OHAUS products which continuously and
automatically maintains a zero indication with no applied load on
the scale. Only affects weighments around zero - does not affect
weighments where tare value is used. Most OHAUS products allow user
to select 0.5, 1 or 3 divisions of Auto Zero Tracking, or to turn
Auto Zero Tracking off. For operations using very small additions
of liquid or powder, Auto Zero Tracking can cause an incorrect
weight display by capturing the weight change -- the solution is to
either use a Fill Mode or turn Auto Zero Tracking off (if
allowed). |
Average Piece Weight (APW)
The average net weight of each piece (or part) in a sample
recorded by dividing the net weight of all pieces together by the
number of pieces in the sample. |
Avoirdupois Weight
A system of measure based on the pound unit that equals 16 ounces,
or 7,000 grains that is equal to 453.59 grams. |
|
| B |
Backlight
The background lighting element on a display, usually an LED
backlight to a LCD display. May be set through menu options on a
scale. |
Balance
An instrument for weighing, usually of higher resolution and
capacity of 8kg or less. |
Beam
A bar or structural member, usually horizontal, supported at
either or both ends and sometimes at one or more intermediate
points, subjected to loads that tend to bend it. |
Beam Scale
A scale where the weight on the platform are indicated solely by
means of one or more weigh-beam bars either alone or in combination
with counterpoise weights. |
Beeper
An audible prompt given by a scale when a condition is reached
(for example, a weight within an acceptable range). |
Below Balance Weighing
Allows users to weigh from below the balance, instead of using the
weighing platter above. Ideal for measuring the density of objects
by weighing them below the balance, both inside and outside of a
container filled with water. |
Bench Scale
A scale adapted for use on a counter or bench, often for
industrial applications. Usually of a higher capacity and lower
resolution than a balance. |
| C |
Calibration
Comparing and adjusting a measuring instrument to a reference
point or standard unit of measure - in the case of scales, to a
known mass. Calibration is critical to accuracy, as all weighing
instruments are affected by local gravity. Most scales are
calibrated at the factory, but they can be affected by shipment, so
calibration should be verified at installation and performed
periodically to maintain accuracy. How often to calibrate a scale
is based on the role of the scale, with the more critical the scale
or balance is to an operation, the more often it should be
calibrated, as well as how harsh the environment is on the scale.
Periodic calibration may also be defined by certification
requirements (such as legal for trade) as well as by the
operations' standard operating procedures. Calibration can be
Manual (adjusting a screw), Semi-Automatic (user is prompted by
scale to place calibration mass on platform), or Automatic (the
balance calibrates itself when needed). |
Calibration Curve
A record (graph) of the comparison of load cell outputs against
standard test loads. |
Calibration Test
A test routine where a required calibration mass is compared to
the mass stored in a scale's memory, with any difference
displayed. |
Capacity
The maximum weight measureable by the scale on its platform, when
combined with a minimum load value (usually 0), defines the scale's
Weighing Range. |
Chain Tare
A series of tare functions where a container is tared, a net
weight recorded, and then the gross weight is tared to allow
weighing a new ingredient - usually used in formulation. May be
repeated up to the capacity of the scale. |
Checkcounting
Counting products with checkweighing limits (for example filling
boxes with a set range of part pieces per box). |
Checkweigher
A weighing device which receives individual objects or packages,
determines precisely the weight of each, compares that weight with
a predetermined standard, and generates signals which distinguish
items as being correct or incorrect. |
Checkweighing
Displaying the weight of an object as it relates to an acceptance
range (Over, Under or OK), often with additional indications like
red, yellow or green LEDs. Used for checking product weights for
uniformity or for creating equal portions of a product. Common
applications include food and other packaging, filling and quality
control checks. |
Counterpoise Weight
An adjusted, removable, (usually) slotted weight, intended to
counterpoise an applied load of designed weight value. |
Counting Resolution
The highest count a scale can support based on the capacity
divided by the minimum Average Piece Weight. May refer to an
external counting resolution, which can be displayed by the scale,
or an internal counting resolution used as part of the counting
process. |
Crane Scale
A scale specially designed for weighing heavy loads while being
handled by a crane. |
Creep
The change in load cell output occurring with time while under
load and with all environmental conditions and other variables
remaining constant. |
Creep Error
The change in output occurring with time, while under constant
load. Specification is given as +/- d value, based on the test
used. |
Custom Unit
A weighing unit established by the user, with the form of Factor
multiplied by 10^Exponent, with Factor, Exponent and Least
Significant Digit (readability graduation) set by user. |
| D |
d
Symbol for the minimum division (d) that can be indicated or
recorded. |
Deadload
The weight of the platter and weighing frame on the load
cell. |
Density Determination
The density of a solid, liquid or gas can be determined using a
balance or scale, where Density = Mass / Volume. Density can be
calculated using a weigh below feature, based on several methods
for liquids and gases. The balance automatically calculates and
guides the user through the density determination procedure.
Results can be printed or sent to a computer. |
Deviation
A statistically derived value representing the randomness among
independent measurements of the same true value. |
Differential Weighing
Automatically calculates the difference between two different
weighing results without the need for a transcription or
calculator. Print or send the data to a computer. |
Direct Sale
A sale in which both parties in the transaction are present when
the quantity is being determined. |
Display Hold
Manually or automatically holds the last stable weight on the
balance display. This mode is perfect for weighing oversized
objects that may obstruct view of the displayed weight
reading. |
Dual-Mass Auto-Cal
A type of three-point calibration for scales with dual internal
calibration masses, where the scale initiates a calibration
automatically based on a change in temperature. |
Dual Range
A weighing range where a portion of the range has a higher
readability than the rest of the range, as limited by the
capabilities of the scale. |
Dynamic (or Animal) Weighing
Weighing an object that is moving, or where the environment is
making it move, with a set time for averaging weighments to provide
a weight result. Common applications include livestock pens,
veterinarian use, and boxes in unstable environments. |
| E |
Electromagnetic Interference (EMI)
Electrical disturbances which propagate into electronic and
electrical circuits and cause deviations from the normally expected
performance. The frequency range of the disturbance covers the
entire electromagnetic spectrum. |
Excitation, Electrical
The voltage or current applied to the input terminals of the load
cell. |
| F |
Filling
By setting a target weight, this mode provides a user friendly
graphic representation of the filling process and how near the end
user is to the target fill weight. Results can be printed or sent
to a computer. Often used for weighing powders and light
liquids. |
Filter
A software routine that limits the effects of environmental
disturbances on a scale. May also be called Averaging level. |
Fliptop Draftshield
The OHAUS Flip-Top draftshield (Adventurer Pro).gives you an easy
access to the weighing chamber, even when using a pipette or lab
spoon. |
Floor Scale
Any platform scale designed for installation with the platform
surface at or near floor level. |
Formulation
Repeatedly and easily reproduce any recipe of ingredients you
need. The balance will ask you to add each ingredient that you
identified in the correct amounts, and will track and document the
results upon completion. Results can be printed or sent to a
computer. |
| G |
g
Symbol for gram. |
General Weighing
Mass measurement as expressed in up to 20 different units of
measure, as well as user definable custom units. OHAUS laboratory
products have capacities as great as 32kg, and resolutions as high
as 0.01mg. Results can be printed or sent to a computer. |
Geocode
A software routine which allows the initial, factory calibration
to be adjusted to allow for the difference between the local
gravity of the installation location and the factory location. |
GLP / GMP (Good Laboratory Process or Good
Manufacturing Process)
Good Laboratory Process or Good Manufacturing Process. These are
systems for process and quality control in laboratories and
manufacturing. For scales, this is a print mode which allows the
user to trace information for weighment time and date, scale user
ID, project ID and scale ID. The results may be output to a printer
or PC using an RS232 port or other communication port. |
Graduation
The minimum unit of readability set by a scale. |
Gravity
The accelerating tendency of bodies toward the center of the
earth. Its symbol is "g", and its value varies geographically.
Gravity affects all weighing instruments at different elevations,
so balances and scales should be calibrated onsite after
installation. |
Gross/Net/Tare Weighing
Selectively displays any combination of Gross/Net/ or Tare weight
based on the user's choice. Results can be printed or sent to a
computer. |
Gross Indicator
A display element that indicates a gross weight (as opposed to a
Net or Tare weight) to the operator. |
Gross Weight
The weight of a quantity of goods, including the container and
wrapping which contains the goods; the total weight of the
merchandise or goods without deduction for dunnage, tare, or waste.
Equal to Net Weight of the item plus the Tare Weight of the
container. Not used in legal for trade applications as the basis
for sale. |
| H |
Hanging Scale
Any scale designed to be hung from an overhead support, and whose
load-receiving element is suspended from the scale. |
Hertz
The unit of frequency; one cycle per second symbolized by Hz. |
High Point Weighing
The balance will automatically remember and hold the highest
weight reading which occurs in a series of weighings. Results can
be printed or sent to a computer. |
Hook Weight
A form of counterpoise weight with an attached hook, usually
intended for use in testing rather than as an accessory in
weighing. |
Housing
An enclosure around the working mechanism of a scale or scale
indicator. |
Hysteresis
The difference between two indicated or represented values for any
given test load, one obtained by increasing the loading from zero
to the given test load, and the other obtained by decreasing the
loading from the maximum rated load to the given test load. |
Hysteresis Error
The difference between two readings at the same load point as the
scale is loaded and unloaded. Affected by Creep Error. |
| I |
I/O Settings
Settings for an input/output device like AC or DC relays. These
settings will govern how the device operates when certain weight
conditions are reached. Often used for controlling external
equipment based on weight as part of a process. |
InCal
A type of span calibration for scales with a single internal
calibration mass, where the operator initiates a calibration
manually which is then automatically performed by the scale. |
Increment
The value of the smallest unit that can be indicated or recorded
by a digital device in normal operation. |
Indicator
A device which indicates weight by converting the original weight
signal to a form of display, regardless of its location relative to
the load receiving element. |
Ingress Protection
The degree of protection the housing or construction of a scale
provides to its mechanism. May be to the National Electrical
Manufacturers Association (NEMA) standard or Industrial Protection
Code (IP) developed by the International Electrotechnical
Committee. IP states protection against penetration and water
resistance only but can be applied to components (like load cells),
while NEMA specifically states protection against icing, corrosion,
oil and coolants but refers to enclosures only. In OHAUS products,
often refers to the products ability to withstand water
infiltration for industrial or food applications. For most light
washdown applications, either NEMA 4 (protection against
hose-directed water) or NEMA 4X (protection against hose-directed
water and corrosion), or IP65 (dust tight and water-jet protected)
or IP67 (dust tight and able to withstand temporary immersion in
water) may be used. Whenever possible, compare the NEMA rating and
the IP rating of a product. |
International Prototype Kilogram
The cylinder of platinum-iridium deposited at the International
Bureau of Weights and Measures and declared to be the international
prototype of the kilogram by the First General Conference on
Weights and Measures. This is the fundamental "Standard" from which
all metric standards of mass are derived. |
| J |
Jewelers Scale
One adapted to weighing gems and precious metals. |
| K |
Key Beep
An audible prompt given when a key is pressed on a scale. |
Key Lock
A submenu of settings to control specific keys functions on a
scale. |
Kg
Symbol for kilogram. |
Knob Weight
A form of weight provided with a machined knob for lifting
purposes. |
| L |
Lb
Symbol for pound. |
Legal For Trade
A term used to indicate that the scale is approved for use in
commercial transactions, where items are bought and sold by weight,
volume and/or length; though there may be additional applications
for which approved scales must be used (Prescribed Applications).
Legal For Trade (LFT) standards seek to make sure that the scale or
balance performs consistently within predetermined maximum
permissible errors, it has been calibrated properly and that the
calibration cannot be changed. Some LFT standards include NTEP
certification (US), Measurement Canada Approval (Canada), OIML
(International) and EC-type Approval (Europe). |
Leveling Foot
In a small capacity scale, especially one designed to be moved
from place to place, an adjustable foot provided to aid in leveling
the scale. |
Library Memories
Memory designated for specific information on a number of items
(SKU, Average Piece Weight, etc.). |
Linear Calibration
A combination of a span calibration and a linearization of the
curve, usually based on 0%, 50% and of 100% capacity. May be 3 or
more points on the weighing curve. |
Linearity Error
The deviation of the scale's displayed results compared to a
theoretical straight line between 0 and maximum capacity -- the
higher the value, the less linearity accuracy. |
Linearization
Correcting for linearity error by a calibration which linearizes
the error, forcing the actual displayed results closer to a 1:1
ratio between platform and displayed weights. May be performed at
three points (0, mid-range and full capacity) or more. |
Load
The weight or force applied to the load-receiving element. |
Loadcell
A transducer which translates downward force into a proportional
electrical signal, which is then converted and adjusted by hardware
and software to display a weight on an indicating element. |
| M |
Mass & Weight
Weight is the force caused by a body's mass as affected by local
gravity, such that Force = Mass * Gravity. Mass is the fundamental
characteristic of a body which causes it to exhibit inertia; the
quantity of material in a body, as differentiated from its size or
weight. Electronic scales measure force, which is converted into a
mass value based on a conversion factor derived by calibrating the
instrument. Local gravity variance (depending on location on Earth)
is compensated for by calibrating the scale again or entering a
Geocode (conversion factor). |
Menu Lock
A submenu of settings to control access to specific menu options
in a scale's software. |
Metric System
A decimal system of weights and measures, of which the gram is the
fundamental unit of mass and the meter is the fundamental unit of
length. |
Metrology
The science of weights and measures. |
Moisture Determination
OHAUS makes a complete line of thermogravimetric moisture
analyzers which can very rapidly calculate percent moisture,
percent solid, and percent regain in a given sample, with precision
up to 0.01%. These analyzers are perfect for a wide variety of
applications, ranging from quality control to waste water
analysis. |
| N |
Negative Checkweighing
Checkweighing out of a container, determining when the removed
material is within the target range using pre-set values. |
Negative Parts Counting
Counting parts out of a container on a scale, with the parts count
at 0 and subsequent removals of parts represented as negative parts
counts. Also called Counting Out. Allows quick parts counting from
boxes of parts without need for additional containers. Can be done
based on Positive or Negative Sampling. |
Negative Parts Counting Sampling
Deriving an Average Piece Weight based on the net weight removed
from a full container of parts on a platform, using a sample count
provided by the operator. Allows parts counting with large
containers of parts directly, without either having to empty the
container or use an additional container. Still requires the tare
weight of the container to be recorded in the scale. |
Net Weight
The weight of an item being weighed, without the weight of a
container, box, or other packaging. Used in legal for trade
applications as the basis for sale. |
No Load
Absence of an applied mass on the load-receiving element. |
| O |
OIML (ORGANISATION INTERNATIONALE DE METROLOGIE
LEGALE)
The International Organization of Legal Metrology (OIML) is an
intergovernmental treaty organization whose membership includes
Member States, countries which participate actively in technical
activities, and Corresponding Members, countries which join the
OIML as observers. It was established in 1955 (see the Convention)
in order to promote the global harmonization of legal metrology
procedures. Since that time, the OIML has developed a worldwide
technical structure that provides its Members with metrological
guidelines for the elaboration of national and regional
requirements concerning the manufacture and use of measuring
instruments for legal metrology applications. |
Off-Center Load (Shift) Error
The difference between a load measured at the center of a platform
and measurements half-distance from the center to the edge of the
platform. |
Overload
The load where the gross weight on the scale platform exceeds the
capabilities of the scale. The safe overload capacity is the weight
over which the scale will be damaged by the weight -- typically
150% of capacity for OHAUS products. |
Over Range Limit
The gross weight on a scale where an error message is displayed
warning of overload. |
| P |
Pan
In a small-capacity scale of the counter type, a saucer-like load
receiving element, usually circular, separable, and formed of a
suitable metal. |
Parts Counting
Counting groups of a part by recording a net weight of the parts
and dividing it by an Average Piece Weight (Average Piece Weight)
that has been statistically derived from a representative sample of
the product being weighed. Accuracy in parts counting involves the
accuracy of the scale, the accuracy of the Average Piece Weight,
and the consistency of the parts being counted -- any specification
given for OHAUS counting scales only refers to the accuracy of the
scale in relation to the weight of the parts provided for the
sample. May involve additional software functionality (Average
Piece Weight enhancement, Auto-Add, etc.) or may involve counting
items into a container or negative counting (removing a set amount
from a full container). Common applications include packaging
parts, inventory control, and restocking parts bins. |
Percent Weighing
Displaying a sample weight as a percentage of the total reference
weight recorded in memory. |
Pipette Calibration
This function utilizes the extremely high accuracy of an OHAUS
Discovery or Voyager Pro balance to calculate the amount of water
expelled from a pipette - allowing the user to adjust the pipette's
fluid delivery precision. |
Platform
A horizontal and generally flat member or element of a scale,
usually rectangular, occasionally square, designed to act as the
load receiving element. |
Positive Parts Counting
Counting parts on to a scale. Opposite of Negative Parts
Counting |
Positive Parts Counting Sampling
Deriving an Average Piece Weight based on the net weight on the
platform divided by a sample count provided by the operator. The
opposite of Negative Parts Counting Sampling. |
Power On Unit
The weighing unit a scale will show when turned on. May be
selected in software for some scales. |
Precision
The degree of agreement between repeated measurements of the same
quantity. The numerical value of precision is normally expressed as
the result of the calculation of the standard deviation. |
Print Output
The information a scale outputs using a communications port, as
defined by certain conditions (on stability, based on a set period
of time or continuously) and with certain contents which may be
user-selected (weight result, gross weight, net weight, tare
weight, programmed text header, user ID, project ID, scale ID,
date/time, difference of a calibration test, weighing mode
information, and other information). |
Programmed (or Pre-set) Tare
A tare function using a tare weight entered with a keypad or
recalled from memory. |
| R |
Radio Frequency Interference (RFI)
Radio frequency interference is a type of electrical disturbance
which, when introduced into electronic and electrical circuits, may
cause deviations from the normally expected performance. |
Readability
The smallest fraction of a division to which a scale can read. The
smallest difference in mass that can be displayed on a scale --
commonly signified as "d" -- also called divisions or increments.
Must be specified in conjunction with a tolerance for repeatability
and linearity for true product comparison. |
Repeatability (also Reproducibility)
How the scale will measure the same value over several
measurements, expressed as a Standard Deviation (1 Sigma). The
higher the value, the greater the variance in results, and the less
accurate the scale. |
Resolution
The total number of divisions based on capacity divided by
readability. Expressed as a ratio 1:X,XXX, or in divisions X,XXXd
or X,XXXe. Legal For Trade resolutions are based on known standards
(NTEP, OIML, Measurement Canada, EC) and are tested by a third
party. |
Retail Price Computing
Computing a total price for an object based on a price/lb and net
weight. Often a LFT application. |
Retain Zero
The ability of a scale to retain the zero weight setting after a
scale has been turned off. |
| S |
Scale
A device for weighing or a series of graduations. |
Scoop
A basin-like, detachable, load receiving element of a small
capacity scale, frequently provided as an accessory to a counter
scale. |
Scoop Counterbalance
In a scale provided with a removable scoop, a permanently attached
device intended to counterbalance the weight of the empty
scoop. |
Screw Knob Weight
A form of knob weight in which the machined knob is screwed into a
tapped hole in the body of the weight. Screw Knob weights are
generally ASTM designs. |
Seal
The sign, symbol or object placed upon a weighing or measuring
device to indicate that it has been inspected and tested by a
governmental agency and found to be correct. |
Set Point
A predetermined condition at which an event takes place in a
control system. |
Slotted Weight
A cylindrical weight with a radial slot to permit it to be applied
on a counterpoise hanger. |
Span Calibration
A calibration performed at 0 and 100% of capacity. A span
calibration can correct the slope, but not the linearity error, of
a scale. |
Specific Gravity
Comparing the density of a mixture or solid against the same
volume of water, expressed as either 1 (equal specific gravity to
water), less than 1 (less dense than water) or greater than 1 (more
dense). Often used to assess mixtures to ensure proper
aeration. |
Spring Scale
A scale in which the applied load is counterpoised, either
directly or indirectly through a lever train -- by a counterforce
induced axially in a helical spring -- whose extension is
translated by suitable means into an indication of weight
value. |
SQC Weighing
Provides users with an automated method to track weighing results
of multiple samples across several batches. Results can be printed
or sent to a computer. |
Stability
The degree of constancy of measurement of an instrument when
subject to variation in external factors such as time, temperature
and supply voltage. |
Stabilization Time
The length of time a scale requires to display a stable weight
value depending on the scale's environment, software filters,
etc. |
Stable Range
A weight tolerance, expressed as a number of divisions, within
which a scale will display a stable weight. |
Static Weighing
Weighing a non-moving object (as opposed to dynamic or animal
weighing). Often-used in general weighing, shipping and
receiving. |
Static Weighing System
A weighing system in which the load being applied is stationary
during the weighing operation. |
Statistical Weighing
This mode captures statistical data from a series of weighings.
This data can be displayed graphically, printed, or sent to a
computer. Statistical weighing is ideal for the analysis,
documentation and control of many like samples. |
Strain gage
A metallic or semiconductor material that is bonded to a surface
and elongates or contracts with that surface, with the resulting
deformation causing a change in the gage's electrical resistance
and allowing subsequent measurement of the deformation. |
| T |
Tare Weight
Weight of the box or container used to weigh an item. Not used in
legal for trade applications as the basis for sale. |
Taring
Compensating for the tare weight of a container by setting the
displayed weight to zero (net) before weighing the container and
the container's contents. |
Tare Range
The capacity range within which a scale can still display a net
weight after taring a container. |
Test Weight
A weight expressly designed and constructed for testing commercial
scales and weights. |
Totalization/Accumulation
Accumulation of data for a set of weighments, sometimes with
statistics. May be set as automatic or as requiring an input from
the operator. This mode is great in helping avoid manual
documentation and calculation errors, as results can be printed or
sent to a computer. |
Transducer
A device for converting energy from one form to another for
information or control purposes. |
Triple Beam
A weigh-beam comprising three bars, usually in the same vertical
plane. |
Two Platform Counting
Parts counting where two different capacity and readability
weighing platforms are used. A smaller capacity (but higher
precision platform) is used to determine the Average Piece Weight,
while a larger capacity (but lower precision) platform is used for
bulk weighing of the parts to be counted. Within the limits of the
counting scale, the resulting resolution is defined by the bulk
capacity divided by the precision of the Average Piece Weight. |
| U |
Underload
A scale is designed to display 0 with the weight of the platter
and weighing frame on the load cell. Underload occurs when the
weighing platter (and possibly frame) is removed, or when the
weighing platform or frame is mechanically affected so that the
load of the frame (and platform) is not on the load cell, affecting
the accuracy of the weighment. |
Under Range Limit
The point at which underload causes an error message to be
displayed on a scale. Typically indicates if the pan is not on the
scale, if shipping stops are still in place, if the overload stops
in the platform are overtorqued or if there is material wedged in
or under the weighing platform. |
| W |
Warm-Up Time
The length of time a scale requires to reach thermal equilibrium,
once it is provided power. Usually 30 minutes, assuming the scale
is acclimated to environment. |
Weigh Below
An attachment point on the bottom of the scale allows weighing
below the balance, usually on a hook. Also called "weigh below
balance" or "weigh below hook". Commonly used for hydrostatic (in
water) density determination or weighing sample buckets. |
Weighing Curve
The plot of the relationship between 0% and 100% of capacity for
reference weights on a platform and the displayed weight reading on
the scale. |
Weighing (or Software) Mode
A software routine programmed into a scale which allows it to meet
the needs of an end-user's application, with the results displayed
in weighing units along with other information. Common modes
include parts counting, checkweighing, percentage weighing, dynamic
(or animal) weighing, display hold, and
totalization/accumulation. |
Weighing Unit
The unit that a weight, or mass for a calibrated scale, is
displayed. May vary according to application, country and be based
on legal requirements. The most common weighing units are
Avoirdupois (lb, oz, tonnes, Grains, pennyweights, troy ounces,
carats) and Metric (kg, g, mg, metric tonnes). For certain
applications, a custom unit defined by the user may be
required. |
Weight
The force with which a mass is attracted toward the center of the
earth by gravity. An object, usually of metal, having a definite
mass, designed for weighing or testing purposes, as, a counterpoise
weight, a test weight, etc. |
| Z |
Zero
Setting the gross weight displayed on a scale to zero, with the
zeroing range limited by software (LFT or approved modes) and new
zero value affected by Auto-Zero Tracking (AZT). |
Zero Checkweighing
Checkweighing against a recorded weight of a reference, with each
sample's weight displayed as being under the reference weight or
over the reference weight. |
Zero Range
The percentage of total capacity within which a zero function may
be performed on a scale, often expressed as 2% or 100%. |