When the length being measured is expressed as the distance
between two lines, this is known as line standard. Line standards are not as accurate as end standards and cannot be used for close tolerance measurement.
How the line standard is transferred to end standard?
To transfer line standard correctly to the ends of the bar,
Line standard comparator
is used. … Explanation: Slip gauges are used as end standards. When slip gauges are used in combination with end bars, there range of measurement is up to 1200 mm.
What is example of line standard?
Measuring scale and tapes are also line standards and comes under working standards of length measurement. This form of measurement is not very convenient to use.
Measurement of length with scale
is an example of line standard.
What is end measurement?
any
of a certain class of instruments that are used to measure or lay out inside and outside dimensions
. An end-measuring instrument consists of two measuring surfaces, which are usually called jaws. A dimension is determined between the two measuring surfaces.
When the length is measured as the distance between centers of two engraved lines it is called?
When the length is measured as the distance between centers of two engraved lines, it is called
line standard
. Both material standards yard and meter are line standards.
What is standard line?
(Entry 1 of 2) :
a railroad line or route upon which the regular or highest rates apply
: a fast-service route in distinction from slower and perhaps longer routes or from one that is partly by rail and partly by water — compare differential route.
What is meant by line standard?
Comparison # Line Standard:
When the length being measured is expressed as the distance between two lines
, this is known as line standard. 2. A scale is quick and easy to use over a wide range of dimension. … A steel scale can be read to about ± 0.2 mm of true value.
What is the accuracy of end standards?
Characteristics of End Standards
These standards are
highly accurate
and used for measurement of close tolerances in precision engineering as well as in standard laboratories, tool rooms, inspection departments, etc. They require more time for measurements and measure only one dimension at a time.
What are the characteristics of end standard?
- a. accuracy of ± 0.2 mm.
- b. accuracy of ± 0.050 mm.
- c. accuracy of ± 0.001 mm.
- d. accuracy of ± 1.00 mm.
What is Abbe’s principle?
This principle states that, “
In order to improve measurement accuracy, the measurement target and the scale of the measuring instrument must be placed in a collinear fashion in the measurement direction
.”
Is reproducibility accuracy or precision?
Precision is the degree to which an instrument or process will repeat the same value. In other words, accuracy is the degree of veracity while
precision is the degree of reproducibility
.
What is vernier caliper least count?
A Vernier scale on a caliper may have a least count of
0.1 mm
while a micrometer may have a least count of 0.01 mm. The least count error occurs with both systematic and random errors. Instruments of higher precision can reduce the least count error.
What is wavelength standard in metrology?
[′wāv‚leŋkth ‚stan·dərdz] (spectroscopy)
Accurately measured lengths of waves emitted by specified light sources
for the purpose of obtaining the wavelengths in other spectra by interpolating between the standards.
How do you find the distance between two straight lines?
The shortest distance between the two points is the length of the straight line drawn from one point to the other. The formula for the shortest distance between two points whose coordinate are (xA,yA), ( x A , y A ) , and (xB,yB) ( x B , y B ) is:
√(xB−xA)2+(yB−yA)2 ( x B − x A ) 2 + ( y B − y A ) 2
.
When length is expressed as distance between two engraved lines on a bar of metal is known as?
LINE AND END MEASUREMENTS
When the distance between two engraved lines is used to measure the length, it is called
line standard or line measurement
. The most common examples are yard and metre.
Where is the standard meter kept?
The Standard Meter. The French originated the meter in the 1790s as one/ten-millionth of the distance from the equator to the north pole along ameridian through Paris. It is realistically represented by the distance between two marks on
aniron bar kept in Paris
.
