New Blue Silver Steel Tape Measure Galvanized

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# New Blue Silver Steel Tape Measure Galvanized

Mini Stainless STEEL TAPE MEASURE
100% brand new, high quality.
Compact and easy to carry.
Portable telescopic tape measure.
Just pull the tape to lock the size in place.
Perfect for daily use, travel, camping, etc.

SKU 42a6cac1f10a Category

## New Blue Silver Steel Tape Measure Galvanized

There are three main factors that affect the measurement accuracy of steel tape: temperature, tension of tape and the error caused by the gravity of tape when it is hung in mid air. The error correction method caused by these three factors is as follows:

1. Temperature

Premise: the steel tape from china factory has no error at 20 ¡æ.

Calculation formula: error due to temperature = actual measured value × Expansion coefficient of tape × (service temperature -20 ¡æ)

For example, the expansion coefficient of a steel tape is 0.0000115, and the correction at 36m at 10 ¡æ is 36000mm × zero point zero zero zero zero one one five × (10-20)=-4.14mm

2. Tension of tape

Premise: the ruler belt does not need tension correction under standard tension. When the tape exceeds or falls below the standard tension, it will stretch.

Calculation formula: error due to tension = (actual measured tension – standard tension) × Measured distance ÷ (telescopic elastic force) × Cross-sectional area of steel tape from china factory)

For example, the standard tension is 50N, and the correction at 36m under 100N tension: (100-50) × 36000mm÷(205800 × 2.52)=3.47mm

3. Error caused by the weight of the tape when the steel tape from china factory is hung in the air for measurement

Calculation formula: error caused by the gravity of the tape = -{(unit weight of the tape × Measured distance) × Measured distance}÷ (24 × Measured tension)

For example, 100N, 36m-{£¨0.000194 × 36000mm£© × 36000mm}÷£¨24 × Measured tension) =-7.32mm

The correction parameters of steel tapes of different specifications are different.

 Origin shangqiu Brand songchuang Model 5m Customized processing Yes Type steel tape Measuring range 0-5000 (mm) Material stainless steel Accuracy 1mm Number of cases 50 Size 1.4 * 10mm Net weight 0.3KG Scope of application construction site and daily life Tape width 10mm Tape length 5m System metric Series Measuring ruler

The indicated value error of the steel tape measure is affected by the standard device of the respective laboratory, environmental conditions and many other factors. The following to use comparative measurement, measurement standard is the standard steel tape measure as an example, explain the problems should be noted when the calibration of the steel tape measure value error.

## 1. Standard steel tape measure and the installation of the steel tape measure and zeroing

Standard steel tape measure and the steel tape measure should be installed in parallel, and kept in the same plane. After the standard steel tape measure and the inspected steel tape measure apply the prescribed tension force respectively, use the zeroing mechanism to align the zero value line pattern center of the inspected tape measure with the zero value line pattern center of the standard steel tape measure.