Steel tape measure distance
Time:
18 Feb,2023
Standard steel tape measure Distance measurement
Common distance measurement methods include tape measure and photoelectric distance measurement. Tape measure is to use a tape measure that can be rolled up / test big / along the ground measurement, belong to direct distance measurement. Photoelectric distance measurement is to use the instrument to transmit and receive modulated light waves between two points to determine the distance according to its propagation speed and time, which is electrophysical distance measurement. Optical distance measurement belongs to indirect distance measurement.
Standard steel tape measure
Tape Measure Distance Measurement
Types of tape measure and measuring tools
There are steel tape measure and leather measuring tape, with lengths of 20m, 30m and 50m.
Distance measurement
Generally first measure out n whole foot section, marked on the ground with a measuring brazier or scribe line, measure the remaining length, the total length of
nX foot section length + residual length in order to prevent errors in measurement and improve the accuracy of measurement, the need for round-trip measurement. To measure the difference between the length of the length and the length of the return measurement, divided by the length of the probable value, into the numerator of 1 fraction, known as the relative error, or relative accuracy. The relative accuracy of the measuring distance of steel ruler should not be less than 1/3000 in general.
Between the two endpoints of the scale field for the standard length L, with the identified steel ruler to measure, corrected by temperature to get L', (L-L')/L for the number of corrections per meter. Multiply by the nominal length, that is, the correction value (d) the length of the steel tape measure distance correction (1) the ruler length correction value is greater than 1/10000 of the ruler length, should be added to the ruler length correction; (2) measuring distance when the temperature difference between the standard temperature and plus or minus 10 degrees, should be added to the temperature correction; (3) along the ground measured ground slope is greater than 1.5%, should be added to the height correction.
Use method
A measuring device includes a measuring mechanism such as a tape measure with a tape, the measuring mechanism having an end hook with a hook, and a mechanism such as a magnet for selectively fixing the tape to an object, such as a pipe, the selective fixing mechanism being connected to the end hook of the measuring mechanism.
Main claims
1. a measuring device comprising: a measuring tool having an end hook; and a magnetic tool which is embedded in the end hook.
(1). Direct reading method
Measurement of the steel tape measure zero scale aligned with the measurement starting point, apply the appropriate pull (pull the ruler force to steel tape measure identification pull or ruler on the calibrated pull, measured by a spring scale), directly read the measurement termination point corresponding to the scale on the ruler.
(2). Indirect reading method
In some parts of the steel tape measure can not be used directly, you can use the steel ruler or right angle ruler, so that the zero scale is aligned with the measurement point, the ruler body and the measurement direction; with the steel tape measure to the steel ruler or right angle ruler on a whole scale of the distance, the remaining length of the reading method to measure.
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