|
Tension Sensor
Terminology |
Accuracy
Stated as a limit tolerance which defines the average deviation
between the actual output versus theoretical output. In practical
transducer applications, the potential errors of nonlinearity,
hysteresis, nonrepeatability and temperature effects do not
normally occur simultaneously, nor are they necessarily additive.
Therefore, accuracy is calculated based upon the RMS value of
potential errors, assuming a temperature band of ± 10° F, full
rated load applied, and proper set up and calibration. Potential
errors of the readout, crosstalk, or creep effects are not
included.
Axial Load
A load applied along a line concentric with the Primary Axis
Calibration
The comparison of transducer outputs against standard test loads.
Calibration Curve
A record of the comparison of the transducer outputs versus
standard test loads.
Compensated Temperature
The range of temperature over which the transducer is compensated
to maintain Rated Output and Zero Balance within specified limits.
Creep
The change in transducer output occurring with time, while under
load, and with all environmental conditions and other variables
remaining constant. Usually measured with Rated Load applied and
expressed as a percent of Rated Output over a specific period of
time.
Crosstalk
With one component loaded to capacity, and the other unloaded, the
output of the unloaded component will not exceed the percentage
specified of its full scale capacity.
Deflection
The change in length along the Primary Axis of the load cell
between no-load and Rated Load conditions.
Drift
A random change in Output under constant Load conditions.
Error
The algebraic difference between the indicated and true value of
the load being measured.
Excitation
The voltage or current applied to the input terminals of the
transducer
Hysteresis
The maximum difference between the transducer output readings for
the same applied load; one reading obtained by increasing the load
from zero and the other by decreasing the load from Rated Output.
Usually measured at half Rated Output and expressed in percent of
Rated Output. Measurements should be taken as rapidly as possible
to minimize Creep.
Load
The weight, torque, or force applied to the transducer.
Load Cell
A device which produces an Output signal proportional to the
applied weight or force.
Natural Frequency
The frequency of free oscillation under no-load conditions.
Non-linearity
The maximum Deviation of the Calibration Curve from a straight
line drawn between the no-load and Rated Load outputs, expressed
as a percentage of the Rated Output and measured on increasing
load only.
Non-repeatability
The maximum difference between transducer output readings for
repeated loadings under identical loading and environment
conditions.
Operating Temperature
The extremes of temperature within which the transducer will
operate without permanent adverse change to any of its performance
characteristics.
Primary Axis
The axis along which the transducer is designed to be loaded;
normally its geometric centerline.
Rated Load (Rated Capacity)
The maximum Axial Load that the transducer is designed to measure
within its specifications.
Rated Output
The signal (voltage) produced by the transducer. Where the output
is directly proportional to excitation, the signal is expressed in
terms of millivolts / volt (mV/V) of excitation.
Resolution
The smallest change in mechanical input which produces a
detectable change in the output signal.
Safe Overload
The maximum load in percent of Rated Capacity which can be applied
without producing a permanent shift in performance characteristics
beyond those specified.
Shunt Calibration
Electrical simulation of transducer output by insertion of known
shunt resistors between appropriate points within the circuitry.
Temperature Shift Span
The change in Output due to a change in transducer temperature.
Expressed as a percentage of load per degree Fahrenheit (Celsius)
change temperature.
Temperature Shift Zero
The change in Zero Balance due to a change in transducer
temperature. Expressed as the change in Zero Balance in percent of
Rated Output per degrees Fahrenheit (Celsius) (change in
temperature).
Zero Balance
The output signal of the transducer with rated Excitation and with
no-load applied, usually expressed in percent of Rated Output.
Zero Return
The difference in Zero Balance measured immediately before Rated
Load application of specified duration and measured after removal
of the load, and when the output has stabilized.
Zero Stability
The degree to which the transducer maintains its Zero Balance with
all environmental conditions and other variables remaining
constant. |
|
