Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Table 4

The specification of the static stress and strain acquisition instrument (DH3816N).

Serial number	Main specifications	Parameters	Units
1	Alternating current	220 V	Hz
2	Number of channels	36	—
3	Data acquisition frequency	5	Hz
4	Strain range	±60000	μƐ
5	Test resolution	0.1	μƐ
6	Voltage range	±6	mV
7	Voltage resolution	5	μV