Lesson 4 Flashcards
(27 cards)
A conformity to an indicated, standard, or true value, usually expresssed as a percentage deviation from the indicated, standard, or true value is know as ____.
Accuracy
The process of adjusting an instrument or compiling a deviation chart so that its reading can be correlated to the actual value being measured is know as a ___ procedure.
Calibration
The change through which the input to an instrument can be varied without initiating an instrument response is called an instrument’s ____.
Dead band
The departure from a desired value; the system deviation that exists after the process has been stabilized is known as ___. A transmitter may also have this characteristic.
deviation
The ratio of change in output divided by the change in an input that caused it is called ___.
Gain
The difference between upscale and downscale results in instrument response, when subjected to the same input approached from opposite directions, is known as a ___ error.
hysteresis
____ is the closeness of a calibration curve to a specified, straight line, which is expressed as the maximum deviation of any calibration point on a specified, straight line during any one calibration cycle.
Linearity
A signal path; a combination of two or more instruments or control functions arranged so that signals pass from one to another for the purpose of measurement and/or control, is known as a ____.
loop
The degree of refinement of a measurement, which depends on the sensitivity of the instrument and observation factors, and is typically expressed in the smallest measurement units available is known as ____.
Precision
The array of values a transmitter is intended to measure is called the ___ of the instrument.
range
The ability of a transmitter to reproduce output readings when exactly the same measured value is applied to it consecutively, under the same conditions, and approaching from the same direction is called ___ and is expressed as the maximum difference between two readings.
repeatability
The difference between the upper and lower limits of a transmitter range that is expressed in the same units as the range of the device is called the instrument’s ____.
Span
Instrument errors identified as an output signal that does not reflect 100% of the expected output signal or does not follow the input span is called ____.
Span Error
A change resulting from an error that is the same throughout the scale is called a ____ error.
Zero-shift
The operation of an automatic control process is dependent upon the ___ of each instrument in the loop.
Accuracy
The safety and proper operation of a controlled process is dependent upon what?
A correctly calibrated instrument
A transmitter is calibrated by using the appropriate input and output ____.
Standards
When an instrument is properly calibrated, its input is a ____ of its output so that the % input span is equal to its ____ output span.
Direct representation; percent
Accuracy is usually expressed as a percentage of the transmitter _____.
Span
Gain is the term for how much a ____ should change given the same ____ change.
output; input
A precise instrument will record an identical ____ signal each time an identical ____ is applied.
output; input
____ are used which establish guidelines for acceptable instrument calibration.
Standards
____ equipment should always be used to calibrate instruments.
Certified test
Certified test equipment can be obtained by having the test equipment compared and calibrated to a ____ test instrument that meets known standards.
certified
