| Accuracy: |
limit
tolerance established after taking the probable errors
of hysteresis, nonlinearity, nonrepeatability, and temperature
effects into consideration |
| Ambient Conditions: |
the medium's conditions (barometric
pressure, humidity, temperature, etc.) surrounding the load cell |
| Ambient Temperature: |
the medium temperature surrounding
the load cell |
| Angular Load: |
Concentric has a common axis with
the primary axis at the point of application plus is at some angle relating to
the primary axis Eccentric is not geometrically centered with the primary
axis at the point of application but at some angle it is relating
to the primary
axis |
| Axial Load: |
the load applied the length of, or parallel to, and having
a common axis with, the primary axis |
| Calibration: |
load cell output comparison against standard test loads
|
| Calibration Curve: |
the graph showing the relationship of the load cell
output against standard test load |
| Capacity: |
The recommended maximum weight or force that can be applied to
the load cell |
| Combined Error: |
the greatest difference from a straight line drawn
between original no-load and rated load outputs; it's expressed as a
percentage of the rated output; and is measured on both growing and
declining loads |
| Compensation: |
the use of ancillary items, supplies, or processes to
decrease known sources of error
|
| Creep: |
the load cell's output change which occurs over time while it's
under load; all environmental conditions and other variables have
remained constant |
| Creep Recovery: |
the load cell's change in no-load output which occurs
over time after removing a load which was applied for a particular
episode of time |
| Creep Return: |
the variation in the load cell after its creep recovery
process and the reading before the application of that load; the
environment and variables have remained constant during the load event |
| Crosstalk: |
weighting one load cell down while another load cell is not
loaded; the unload cell's output is not to exceed its full-scale
capacity |
| Deflection: |
the change of length along the primary axis of the load
cell involving no-load and rated-load conditions
|
| Drift: |
A hit and miss alteration in output under the condition of a
constant load
|
| Eccentric Load: |
a load which is applied parallel to, but not having a
common axis with, the primary axis |
| Electrical Excitation: |
the voltage or current directed to the input
terminals of a load cell
|
| Error: |
the statistical difference between the designated and the true
value of the measured load |
| Fatigue Capacity: |
amount, as a percentage, of the smallest load limit
capacity; derived from a minimum of 100 x 106 cycles from zero to
full-fatigue capacity plus a minimum of 50 x 106 from full-fatigue
capacity tension to full-fatigue capacity compression load
|
| Frequency Response: |
the span of frequencies over which the load cell
output follows the changeable sine wave mechanical input (within
specified limits)
|
| FS: |
abbreviation for full scale |
| Full Scale: |
the amount produced equivalent to the maximum load for a
specific application or test |
| Full Scale Output: |
the numerical distinction between the least output
and the rated capacity |
| Hysteresis: |
the greatest difference between load cell output readings
for the same applied load; one reading gotten by escalating the load
from zero, the other by lessening the load from rated output
|
| Insulation Resistance: |
the DC resistance calculated between load cell
circuit and load cell structure; typically measured at 50 volts under
average test conditions
|
| Load: |
the force, mass, or torque applied to a load cell
|
| Load Cell: |
the mechanism that generates an output signal relative to
the applied force, mass, or torque |
| Measured Media: |
the physical number, property, or circumstance which is
measured - acceleration, force, mass, or torque
|
| Natural Frequency: |
the rate of free oscillations under no-load
conditions |
| No Load: |
the load cell's condition at its usual physical placement; no force applied; no equipment or load receptors attached
|
| Nominal Load Limit Capacity: |
the intended standard maximum capacity of
a transducer; unless otherwise specified |
| Nonlinearity: |
the greatest difference of the calibration curve from a
straight line drawn between the no-load and the rated outputs; depicted
as a percentage of the rated output; only calculated on increasing load |
| Output: |
the load cell's produced signal (current, pressure, voltage,
etc.); when directly comparative to electrical excitation, the signal
must be expressed in like terms (volts per volt, per ampere, etc.) |
| Overload Ratings: |
Safe is the utmost load in percent of rated capacity
that can be applied without creating an everlasting change in
performance characteristics further than what's specified
Ultimate is the maximum load in percent of rated capacity that can be
applied without causing a structural breakdown |
| Primary Axis: |
the geometric centerline (axis) along which the load cell
is designed to be loaded |
| Rated Capacity or Rated Load: |
the highest axial load that the load cell
is calculated to measure within its specification |
| Rated Output: |
the numerical variation between the output at no load and
at rated load |
| Sensitivity: |
the proportion of change in output to mechanical input |
| Reference Standard: |
a force-measuring device with characteristics that
are specifically known in reference to a core measure |
Non-repeatability
(Repeatability): |
the greatest dissimilarity between
load cell output readings for continual loadings under the same
environmental and loading conditions |
| Resolution: |
the least amount of change in mechanical input that makes a
change in the output signal |
| RO: |
abbreviation for rated output |
| Shunt Calibration: |
an electrical simulation of load cell output; done
by placing known shunt resistors between suitable points within the
circuitry |
| Shunt-To-Load Correlation: |
the variation in output readings; acquired
through electrically simulated and actual applied loads |
| Side Load: |
any load acting 90 degrees to the primary axis at the point
of axial load use |
| Span: |
the numerical variation between the output at no load and at
rated load (rated output) |
| Specifications: |
the error confines within which each device will
function |
| Stabilization Period: |
a time requirement that assures any further
change in the parameter being measured is acceptable |
| Standard Test Conditions: |
The environmental conditions (temperature of
73.4 degrees +/- 3.6 degrees F or 23 degrees +/- 2 degrees C; relative
humidity of 90% or less; barometric pressure of 28 to 32 in. Hg) under
which measurements should be made when measurements under any other
condition may result in difference of opinion between a variety of
observers at different times and locations |
| Static Extraneous Load Limits: |
calculation so only one inappropriate
load can be applied concurrently with 50% of the nominal load limit
applied (300% of the nominal load capacity) |
| Strain Gauge: |
a device for measuring which will convert force,
pressure, tension, torque into an electrical signal |
| Span Temperature Coefficient: |
a change in temperature of the load cell
has created a change in rated output; often expressed as a percentage of
load per degree of Centigrade temperature change |
| Zero Temperature Coefficient: |
a change in temperature of the load
cell has created a change in the zero balance; often expressed as a
percentage of zero balance per degree of Centigrade temperature change |
| Temperature Range: |
Compensated is the temperature range over which the
load cell is compensated to keep the explicit limits within for rated
output and zero balance Safe is the temperature extremes within which
the load cell will function without everlasting unfavorable change to
any of its performance characteristics |
| Terminal Resistance: |
Corner To Corner is the load cell's circuit
resistance measured at specific adjacent bridge terminals; at standard
temperature; no load applied; and with open-circuited electrical
excitation and output terminals Excitation is the load cell's circuit
resistance at the electrical excitation terminals; at standard
temperature; no load applied; and with open-circuited output terminals
Signal is the load cell's circuit resistance measured at the output
signal terminals; at standard temperature; no load applied;
open-circuited electrical excitation terminals |
| Traceability: |
the transfer process, step by step, by which the load
cell's calibration can be correlated to primary standards |
| Zero Adjustments: |
tuning the load cell to affix the output signal at
zero when zero load or zero pressure is applied |
| Zero Balance: |
the load cell's output signal rated excitation; no load
applied; usually expressed in percent of rated output |
| Zero Return: |
the difference in zero balance measured immediately before
rated load application of specific extent; measured after removal of the
load; measured again when the output has stabilized |
| Zero Shift, Permanent: |
an everlasting modification in the no-load
output |
| Zero Stability: |
the load cell keeps its zero balance when there are
constant environmental conditions and other variables |
