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, non-repeatability and temperature effects do no normally occur simultaneously, nor are they necessarily additive. 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.
The conditions (humidity, pressure, temperature, etc.) of the medium surrounding the transducer.
The temperature of the medium surrounding the transducer.
Angular load, concentric
A load applied concentric with the primary axis at the point of application, and at some angle with respect the primary axis.
Angular load, eccentric
A load applied eccentric with the primary axis at the point of application, and at some angle with respect the primary axis.
A load applied along a line concentric with the primary axis.
The comparison of transducer outputs against standard test loads.
A record (graph of the comparison of transducer outputs against standard test loads.
Combined errors – nonlinearity and hysteresis
The maximum deviation from the straight line drawn between the original no-load and rated load outputs expressed as a percentage of the rated output and measured on both increasing and decreasing loads.
The utilization of supplementary devices, materials, or processes to minimize know sources of errors.
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.
The change in no-load output occurring with time, after removal of a load which has been applied for specific period of time.
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.
The change in length along the primary axis of the load cell between no-load and rated load conditions.
A random change in Output under constant Load conditions.
Any load applied parallel to, but not concentric with, the primary axis.
The algebraic difference between the indicated and true value of the load being measured.
The voltage or current applied to the input terminals of the transducer.
Capacity as a percentage of the nominal load limit capacity, and based on 100 x 106 cycles (minimum) from zero to full fatigue capacity and 50 x 106 cycles (minimum) from full fatigue capacity tension to full fatigue capacity compression load.
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 load. Note: Usually measured at half rated output and expressed in percent of rated output. Measurements should be taken as rapidly as possible to minimize creep.
The DC resistance measured between the transducer circuit and the transducer structure. Note: Normally measured at fifty volts DC and under standard test conditions.
The weight, torque, or force applied to the transducer.
A device which produces an output signal proportional to the applied weight or force.
The frequency of free oscillation under no-load conditions.
Nominal load limit capacity
It is designed normal maximum capacity of a transducer is based on this capacity unless specified.
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.
This signal (voltage, current, etc.) produced by the transducer. Where the output is directly proportional to excitation, the signal must be expressed in terms of volts per volt, volts per ampere, etc. of excitation.
The algebraic difference between the outputs at no-load and at rated load.
The maximum load in percent of rated capacity which can be applied without producing a permanent shift in performance characteristics beyond those specified. Overload static rating ultimate extraneous limit. Only one ultimate static extraneous load limit (200% of Static Extraneous Load Limit (F or F or M or M or M) can be applied simultaneously with 100% of the nominal load limit capacity without producing a structural failure.
The axis along which the transducer is designed to be loaded; normally its geometric centerline.
Rated capacity (Rated load)
The maximum axial load that the transducer is designed to measure within its specifications.
A force measuring device whose characteristics are precisely known relative to a primary standard.
The maximum difference between transducer output readings for repeated loadings under identical loading and environmental conditions.
The smallest change in mechanical input which produces a detectable change in the output signal.
The ratio of the change in output to the change in mechanical input.
Electrical simulation of transducer output by insertion of known shunt resistors between appropriate points within the circuitry.
The difference in output readings obtained through electrically simulated and actual applied loads.
Standard test conditions
The environmental conditions under which measurements should be made, when measurements under any other conditions may result in disagreement between various observers at different times and places.
Temperature effect on output
The change in output due to a change in transducer temperature. Usually expressed as a percentage of load per degree Fahrenheit change temperature.
Temperature effect on zero balance
The change in zero balance due to a change in transducer temperature. Note: Usually expressed as the change in zero balance in percent of rated output per degrees Fahrenheit (change in temperature).
Temperature range, compensated
The range of temperature over which the transducer is compensated to maintain rated output and zero balance within specified limits.
Temperature range, safe
The extremes of temperature within which the transducer will operate without permanent adverse change to any of its performance characteristic.
Terminal resistance, excitation
The resistance of the transducer circuit measured at the excitation terminal, at standard temperature, with no-load applied, and with excitation and output terminals open-circuited.
Terminal resistance, signal
The resistance of the transducer circuit measured at the output signal terminals, at standard temperature, with no-load applied, and with the excitation terminals open-circuited.
The step-by-step transfer process by which the transducer calibration can be related to primary standards.
The output signal of the transducer with rated Excitation and with no-load applied, usually expressed in percent of Rated Output.
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 shift, permanent
A permanent change in the no-load output.